Sungrow SG3425UD-MV User guide

SG3425UD-MV/SG3600UD-MV MV
Turnkey StationSystem
ManualSG3425UD_3600UD-MV-
SEN-Ver19-202208M-H-002011
System Manual
MV Turnkey Station
SG3425UD-MV/SG3600UD-MV
SG3425UD_3600UD-MV-SEN-Ver19-202208

I
Contents
1 About This Manual ...........................................................................................1
1.1 Validity ..........................................................................................................1
1.2 Content..........................................................................................................1
1.3 Target Group..................................................................................................1
1.4 Symbols Explanation ......................................................................................2
1.5 How to Use this Manual ..................................................................................3
1.6 Terminology ...................................................................................................3
2 Safety Instructions ............................................................................................4
2.1 Intended Usage..............................................................................................4
2.2 Important Safety Instructions ...........................................................................4
2.2.1 General Safety Rules ............................................................................5
2.2.2 Manual Storage ....................................................................................5
2.2.3 PV Arrays Hazards................................................................................6
2.2.4 Ground Fault Protection.........................................................................6
2.2.5 Live Line Measurement .........................................................................6
2.2.6 Measuring Instrument............................................................................6
2.2.7 Volt-free Operations ..............................................................................7
2.2.8 ESD Protection .....................................................................................7
2.2.9 LCD Parameter Setting..........................................................................7
2.2.10 Sand and Moisture Protection ..............................................................7
2.2.11 Symbols on the Device Body ................................................................7
2.2.12 Safety Warning Signs ..........................................................................8
2.2.13 Daily Operation and Maintenance.........................................................8
2.2.14 Disposal of Waste ...............................................................................8
2.2.15 Manual Description..............................................................................9
3 Product Description ........................................................................................10
3.1 Brief Introduction ..........................................................................................10
3.2 External Design of the MV Station..................................................................10
3.2.1 MV Station Views................................................................................10
3.2.2 Mechanical Parameter......................................................................... 11
3.2.3 Ventilation Design ...............................................................................12

II
3.3 Internal Design of the MV Station ...................................................................13
3.3.1 Internal Components...........................................................................13
3.3.2 Cable Entry Design .............................................................................13
3.3.3 Internal Devices of the Inverter.............................................................14
3.3.4 Operations on the DC and AC Side ......................................................15
4 Delivery ............................................................................................................17
4.1 Scope of Delivery .........................................................................................17
4.2 Identifying the MV Station..............................................................................17
4.3 Checking for Transport Damages...................................................................18
4.4 Storage of the MV Station .............................................................................18
5 Mechanical Installation ..................................................................................19
5.1 Transport .....................................................................................................19
5.2 Hoisting the MV Station.................................................................................20
5.2.1 Safety Precautions..............................................................................20
5.2.2 Hoisting..............................................................................................21
5.2.3 Fastening of Connectors......................................................................22
5.3 Foundation...................................................................................................23
5.3.1 Selection of Installation Site .................................................................23
5.3.2 Foundation Requirements....................................................................23
5.3.3 Recommended Foundation Construction Method ..................................24
5.4 Installing the Drain Valve/Oil-Water Separator.................................................24
5.4.1 Installing the Drain Valve(Optional).......................................................25
5.4.2 Installating Oil-Water Separator (Optional) ............................................25
5.5 Fixing the MV Station....................................................................................26
5.6 Removing the Supporting Plates....................................................................26
6 Electrical Installation ......................................................................................28
6.1 Safety Instructions........................................................................................28
6.1.1 Generals Rules...................................................................................28
6.1.2 Five Safety Rules................................................................................30
6.2 Preparation before Electrical Connections ......................................................30
6.2.1 Installation Tools .................................................................................30
6.2.2 Opening the Inverter Door....................................................................31
6.2.3 Checking the Cables ...........................................................................32
6.2.4 During Connection ..............................................................................32
6.3 Circuit Diagram and Cable Connection...........................................................32
6.3.1 Circuit Diagram ...................................................................................32

III
6.3.2 Cable Specifications............................................................................33
6.4 Ground Connection ......................................................................................33
6.5 AC Connection .............................................................................................35
6.5.1 Safety Instructions ..............................................................................35
6.5.2 AC Cable Connection..........................................................................35
6.6 DC Connection.............................................................................................38
6.6.1 Checking before Connection ................................................................38
6.6.2 DC Cable Connection..........................................................................38
6.7 Communication Connection ..........................................................................42
6.8 External Equipment Connection.....................................................................42
6.8.1 5KVA Power Distribution Cabinet .........................................................43
6.8.2 35KVA Power Distribution Cabinet........................................................44
6.9 Finishing Electrical Connection ......................................................................45
7 Commissioning ...............................................................................................47
7.1 Safety Instructions........................................................................................47
7.2 Requirements of Commissioning ...................................................................47
7.3 Checking before Commissioning ...................................................................48
7.3.1 Checking the Cable Connection ...........................................................48
7.3.2 Checking the Inverter ..........................................................................48
7.3.3 Checking PV Array ..............................................................................48
7.3.4 Checking Grid Voltage.........................................................................49
7.4 Preparation before Starting ...........................................................................50
7.5 LCD Parameter Setting .................................................................................50
7.6 Completing Commissioning...........................................................................50
8 Starting/Stopping ............................................................................................52
8.1 Starting........................................................................................................52
8.1.1 Inspection before Starting ....................................................................52
8.1.2 Start Steps .........................................................................................52
8.2 Stopping ......................................................................................................53
8.2.1 Normal Stop .......................................................................................53
8.2.2 Stop in Case of Fault ...........................................................................54
9 LCD Menu Operation .....................................................................................55
9.1 LCD Touch Screen .......................................................................................55
9.2 Default Screen .............................................................................................55
9.2.1 Initialization ........................................................................................55
9.2.2 Default Screen Introduction..................................................................55

IV
9.2.3 Backlight and Screensaver ..................................................................56
9.3 Overview of LCD Menu and Icon....................................................................56
9.3.1 Overview of Submenu and Icon............................................................56
9.3.2 Layout of the submenus.......................................................................57
9.4 Entering Password .......................................................................................57
9.5 Setting Language .........................................................................................59
9.5.1 Conventional Way ...............................................................................59
9.5.2 Shortcut .............................................................................................59
9.6 Setting Date and Time ..................................................................................59
9.7 Energy Output Deviation Adjustment..............................................................60
9.8 Checking Running Information ......................................................................60
9.9 Checking History Information ........................................................................61
9.9.1 Checking History Event .......................................................................61
9.9.2 Checking History Data ........................................................................61
9.9.3 Checking History Fault ........................................................................61
9.9.4 Checking History Alarm ......................................................................62
9.10 Checking Present Fault Information .............................................................62
9.11 Starting/Stopping ........................................................................................63
9.12 Load Default...............................................................................................63
9.13 Checking Firmware Version ........................................................................63
9.14 Parameters of LCD .....................................................................................64
9.14.1 Communication Parameters...............................................................64
9.14.2 Running Parameters .........................................................................64
9.14.3 Protection Parameter.........................................................................64
10 Main Functions .............................................................................................65
10.1 Operation Mode..........................................................................................65
10.1.1 Mode Change ...................................................................................65
10.1.2 Operation Mode Description...............................................................65
10.2 Complete Control Strategy(Optional)............................................................67
10.3 Active Power Limitation ...............................................................................67
10.3.1 Introduction to Active Power Limitation................................................67
10.3.2 How to Realize Power Limitation ........................................................67
10.4 Reactive Power Adjustment ........................................................................68
10.5 Low Voltage Ride Through (LVRT) ...............................................................69
10.6 High Voltage Ride Through (HVRT)..............................................................70
10.7 Self-constructed Grid ..................................................................................70
10.7.1 Low Voltage Mode.............................................................................70

V
10.7.2 High-voltage Mode ............................................................................72
10.8 MPPT ........................................................................................................73
10.9 Intelligent Temperature-Control Technology ..................................................74
10.10 Anti-PID Effect Function (Optional).............................................................74
10.10.1 Introduction to PID Effect .................................................................74
10.10.2 Anti-PID Function Setting.................................................................74
10.10.3 PID Repair......................................................................................75
10.11 Insulation Monitoring Function....................................................................75
10.11.1 Introduction.....................................................................................75
10.11.2 Simple Troubleshooting....................................................................76
10.12 Emergency Stop Button functions ..............................................................76
10.13 Tripping Functions of the DC Main Switches ...............................................76
10.14 Protection Function...................................................................................77
10.14.1 DC Over-voltage Protection..............................................................77
10.14.2 AC Over/under-voltage Protection ....................................................77
10.14.3 Frequency Anomaly Protection.........................................................77
10.14.4 Islanding Protection.........................................................................77
10.14.5 Overload Protection ........................................................................78
10.14.6 Ground Protection ...........................................................................78
10.14.7 Module Over-temperature Protection ................................................78
10.14.8 Internal Over-temperature Protection ................................................78
11 Troubleshooting ............................................................................................79
11.1 Safety Instructions ......................................................................................79
11.2 Checking Fault ...........................................................................................79
11.3 Fault and Troubleshooting on the Inverter .....................................................80
11.4 Fault and Troubleshooting on the MV Transformer ........................................90
11.5 Other Fault and Troubleshooting ..................................................................92
12 Routine Maintenance ..................................................................................93
12.1 Overview....................................................................................................93
12.2 Safety Instructions ......................................................................................93
12.2.1 General Safety Rules ........................................................................93
12.2.2 Five Safety Rules ..............................................................................94
12.3 Maintenance ..............................................................................................94
12.3.1 Introduction.......................................................................................94
12.3.2 Maintenance Interval .........................................................................94
12.4 Cleaning the MV Station..............................................................................99
12.4.1 Introduction.......................................................................................99

VI
12.4.2 Cleaning Interval ...............................................................................99
12.4.3 Cleaning the Internal Dust..................................................................99
12.4.4 Cleaning the Foundation....................................................................99
12.4.5 Checking and Cleaning the Air Inlets/outlets........................................99
12.4.6 Cleaning the Surface of the MV Station ............................................. 100
12.4.7 Checking the Lock and Hinge........................................................... 101
12.4.8 Checking the Sealing Strip ............................................................... 101
12.5 Painting Make-up Measures ...................................................................... 101
12.6 Replacement of the Electrical Components................................................. 104
12.6.1 Safety Instructions........................................................................... 104
12.6.2 Replace DC Fuses ..........................................................................104
13 Cyber Security Protocol ............................................................................107
13.1 Password Change Requirements............................................................... 107
13.2 Port Protection and Isolation...................................................................... 107
13.3 Network Cables and Tamper Evident Seals Inspection ................................ 107
14 Cybersecurity Best Practice .....................................................................109
15 Appendix ..................................................................................................... 110
15.1 System Parameter.................................................................................... 110
15.2 Tightening Torques ................................................................................... 111
15.3 Exclusion of Liability.................................................................................. 112
15.4 Contact Information .................................................................................. 112

1
1About This Manual
1.1 Validity
This manual is intended for the following product:
• SG3425UD-MV
• SG3600UD-MV
Hereinafter it will be referred to as " MV Station" unless otherwise specified.
1.2 Content
This manual contains the following information:
Content Description
Safety
instruction
Safety instructions concerning the installation, operation, maintenance
and troubleshooting of the MV Station
Product
Description The appearance and internal components of the MV Station
Delivery Delivery and inspection after receiving the MV Station
Installation Mechanical transport, installation, and electrical connection of the MV
Station
Commissioning Safety notices and commissioning process when the MV Station is
powered on for the first time
Start/Stop Steps to start and stop the MV Station internal devices during normal
maintenance or troubleshooting
Operation of
LCD Display Function and use of the MV Station HMI
Functions Descriptions of the MV Station main functions
Troubleshooting Simple troubleshooting of the MV Station
Daily operation Instructions and guide of the daily operation of the MV Station
1.3 Target Group
This manual is for technical personnel who are responsible for the transport, installation and
other operations of the MV Station. Only qualified personnel can perform the installation,
maintenance and troubleshooting of the MV Station. Unauthorized persons should not
perform any operation on the MV Station and should be away from the MV Station to avoid
potential hazards. Qualified personnel are:

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• Equipped with certain electrical, electrical wiring and mechanical knowledge and familiar
with electrical and mechanical principle diagram.
• Familiar with the construction and working principle of the PV grid-connected power
generation system.
• Familiar with the construction and working principle of the MV Station upstream and
downstream equipment.
• Trained specifically for electrical device installation and commissioning.
• Equipped with the ability to cope with the dangerous and emergency situations during
installation and commissioning.
• Familiar with the country/regional standards and specifications.
• Familiar with this manual.
1.4 Symbols Explanation
This manual contains important safety and operational instructions that must be accurately
understood and respected during the installation and maintenance of the equipment.
To ensure the optimum use of this manual, note the following explanations of the symbols
used.
DANGER indicates a hazard with a high level of risk which, if not avoided, will
result in death or serious injury.
WARNING indicates a hazard with a medium level of risk which, if not avoided,
could result in death or serious injury.
CAUTION indicates a hazard with a low level of risk which, if not avoided, could
result in minor or moderate injury.
NOTICE indicates a situation which, if not avoided, could result in equipment or
property damage.
NOTE indicates additional information, emphasized contents or tips to help you
solve problems or save time.
1 About This Manual System Manual

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The symbols below may be found on the electrical parts of the inverter. Make sure to read
the following symbols and fully understand them before installing the equipment.
Symbol Explanation
Lethal voltage inside! Do not touch!
Hot surface! Do not touch the hot surface of the device.
After the inverter is disconnected, you need to wait 5 minutes before
touching the internal conductive devices.
Protective earth(ground). Earthing(grounding) securely to ensure
personal safety.
When working on the device, wear hearing protection.
1.5 How to Use this Manual
Read this manual and other related documents before transporting and installing the device.
Documents must be stored at hand and available at all times.
All rights reserved including the pictures, markings and symbols used. Any reproduction or
disclosure, even partially, of the contents of this manual is strictly forbidden without prior
written authorization of Sungrow.
The contents of the manual will be periodically updated or revised due to the product
development. It is probably that there are changes of manual in the subsequent edition.
1.6 Terminology
Name For short
MV Turnkey Station MV Station
Inverter Inverter
Module unit Unit
Intelligent power distribution cabinet Intelligent PMD or PMD
The foregoing devices are expressed in the abbreviation form in this document unless
otherwise specified.
System Manual 1 About This Manual

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2Safety Instructions
2.1 Intended Usage
The MV Station, designed and manufactured by Sungrow, is mainly applied to large-and-
medium PV power stations. The MV Station can meet the requirements of modular design
and quick installation for large-and-medium PV power stations, and can ensure long-term,
reliable, and safe feed-in operation.
No. Name
A PV array
B PV array combiner box
C MV Station
D Utility grid
Installation of the MV Station not in compliance with the description in this manual
or installation or modification of the device without authorization from Sungrow
may lead to personal injuries or device damages and may void pertinent warranty
claims from Sungrow.
2.2 Important Safety Instructions
Read the safety instructions carefully before installing the MV Station. Refer to
corresponding manuals for the safety instructions on the internal devices.

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2.2.1 General Safety Rules
Touching of the terminals or contactors connected to the grid may lead to electric
shock hazards!
• Do not touch the terminals or conductors connected to the grid.
• Respect all safety instructions on the grid connection.
Lethal voltages are present inside the device!
• Pay attention and follow the warning signs on the device.
• Respect all safety instructions in this manual and other pertinent documents.
Electric shock or fire may occur due to the device damage or system fault.
• Visual inspect for device damages or other hazards
• Check if the external devices and circuit connections are safe.
• Only operate the device when it is safe to do so.
All installations and operations on the MV Station must be in full accordance to the
national and local regulations and standards.
2.2.2 Manual Storage
Product manuals are indispensable part of the product. Very important information about the
transport, installation, maintenance and troubleshooting of the MV Station is included in this
manual. All the descriptions in this manual, especially those safety-related items, must be
complied with. Read all the instructions thoroughly prior to any operation work on the MV
Station.
• Transport, install, maintain and service the MV Station by strictly following the
descriptions in this manual. Device damage, personal injury, or property loss may be
caused if otherwise
• This manual and relevant documents should be available for relevant persons at all
times.
System Manual 2 Safety Instructions

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2.2.3 PV Arrays Hazards
DC high voltage! Electric shock hazards!
When exposed to sunlight, PV array will produce voltage, which is very high in
large-scale power stations.
Death from burning and electric shock due to touching the PV array
During installation, maintenance and troubleshooting of the device, ensure:
• Station is disconnected from the PV array.
• Necessary warning signs are in place to prevent accidental reconnection.Necessary
warning signs are in place to prevent accidental reconnection.
2.2.4 Ground Fault Protection
If a ground fault occurs in the PV system, some parts that are supposedly voltage-
free may carry lethal voltage. Accidental touch may cause serious damage. Make
sure there is no system ground fault before operation and take proper protection
measures.
2.2.5 Live Line Measurement
High voltages are present inside the device. Death resulting from burning and
electric shock upon touching the live components of the MV Station. During live
line measurement,
• wear suitable protective equipment, for example dielectric gloves, and
• accompany by other persons.
2.2.6 Measuring Instrument
Instrument for measurement of the electrical parameters should meet the requirements
listed below:
• Instrument for measurement of the electrical parameters should be high quality
instrument with sufficient measuring range.
• Make sure the connection and use of the instrument are correct to avoid arc
and other dangerous situations.
• Use suitable protective equipment, for example dielectric gloves if live line
measurement is required.
2 Safety Instructions System Manual

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2.2.7 Volt-free Operations
Perform operations on the MV Station only when all devices inside the MV Station,
especially the MV Ststion is completely voltage-free.
• Avoid any accidental re-connections.
• Verify that no voltage or current is present with appropriate measurement instrument
• Ground and short-circuit whenever necessary.
• Cover possible live parts to avoid accidental contact.
• Ensure sufficient escape room.
• Wait at least 5 minutes to have the capacitors discharge completely before performing
operations on internal components.
2.2.8 ESD Protection
Devices may be damaged irreversibly by electrostatic discharge (ESD).
• Avoid unnecessary touching of the PCB.
• Observe all the ESD-related safety instructions. Wear proper PPE, such as
safety glasses, safety footwear, and safety gloves.
2.2.9 LCD Parameter Setting
Some settable parameters on the LCD are closely related to the operations of the MV
Station and internal devices. Therefore these parameters can only be set after reliable
evaluation of the system.
• Improper parameter setting may affect the functionality of the device.
• Only qualified personnel can set the parameters.
2.2.10 Sand and Moisture Protection
Do not open the MV Station door in sand storm, thunderstorm, strong wind or hail days or
when the ambient humidity is above 95%.
2.2.11 Symbols on the Device Body
Symbols on the devices body contain important information on the safe operation of the MV
Station and its internal devices. Do not tear or damage them!
System Manual 2 Safety Instructions

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Do not damage or tear the symbols.
• All symbols on the device body must be clearly visible.
• Replace the symbols once any damaged or unclearness is detected.
2.2.12 Safety Warning Signs
During transport, installation, maintenance and troubleshooting of the MV Station, keep non-
related persons away.
• Post warning signs near the MV Station upstream and downstream switches to prevent
accidental connection.
• Place necessary warning signs or barriers near the on-site operation areas.
2.2.13 Daily Operation and Maintenance
Make sure the MV Station doors are closed and locked during daily operation to prevent
internal devices from damages by rain or rodents.
Routine check and maintain the MV Station and internal devices to ensure long and reliable
operation of the MV Station.
Take proper insulation protection measures during live line operation. At least two
persons are required until the operation is performed.
Proper field rescue facilities are required since most PV stations are installed in
places far away from the urban areas.
Take the followings into consideration during daily operation and maintenance:
• The nameplate is pasted on the MV Station body. It contains very important parameter
information about the devices. Protect the nameplate during all operations.
• Heating components may exist inside the MV Station. When the device stops, the
heating components may still be hot. Wear proper glove when working on them.
• Wear proper PPE, such safety glasses, safety footwear and safety gloves if necessary.
• Necessary auxiliary measures are recommended to ensure personal and device safety.
2.2.14 Disposal of Waste
When the MV Station or internal devices is end of life, it cannot be disposed of together with
household wastes. Some components inside can be recycling and some components can
cause environment pollution.
Contact the local authorized collection point.
2 Safety Instructions System Manual

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2.2.15 Manual Description
For user’s convenience, there are a large number of pictures in this manual.
These pictures are indicative only. For details about the device, refer to the actual
product you receive.
Keep this manual at a convenience place near the device for future reference
during installation, operation, maintenance and troubleshooting of the device.
All the descriptions in this manual are based on the standard MV Station, and the
actual product you receive may differ. If necessary, specify your requirements
when placing the order.
This manual may not cover all possible situations. Should a specific problem occur that is
not explained in this manual, contact Sungrow.
System Manual 2 Safety Instructions

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3Product Description
3.1 Brief Introduction
The MV Station mainly applies to medium and large-scale PV generation systems. Based
on standard-sized outdoor container, the MV Station integrates inverter, transformer,power
distribution and monitoring unit to meet with the requirements of modular design and fast
installation of the PV systems.The MV Station converts DC current generated from the PV
array into grid-compatible AC current, which can be directly fed into the medium voltage grid.
3.2 External Design of the MV Station
3.2.1 MV Station Views
Four views of the MV Station are as follows:
Control and Monitoring Window
The Control and Monitoring window is located on the back side of the inverter.
As shown in the figure below, the LED indicators are at the upper part, the color liquid crystal
(LCD) touchscreen is at the middle part, and the emergency stop button is at the lower part.

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figure 3-1 Control and Monitoring window
The LEDs at the upper side of the Control and Monitoring Window: POWER indicates
power-on state; OPERATION indicates normal operation; and FAULT indicates the
occurrence of faults.
The working status of the MV Station can be acquired through these LEDs.
LED Color Description
POWER Green The control circuit power supply is supplying power.
OPERATIO-
N
White MV Station is in stop mode.
Green MV Station is in grid-connected run mode.
Yellow MV Station is in alarm run mode.
FAULT Red A fault occurs and has not been removed. The indicator will be
off when the fault is cleared.
Buttons
The functions of each button are shown in the table below.
Button Description
DC Turn this knob switch to disconnect/connect the DC switch
EMERGENCY STOP When an emergency occurs, the DC load break switches and AC
circuit breakers disconnect automatically after pressing the
emergency stop button.
The MAINTENANCE INTERFACE
The cover plate of the LCD can only be opened with the key. Remove the key and store it
properly after use.
The cover plate of the LCD can only be opened with the key. Remove the key and
store it properly after use.
3.2.2 Mechanical Parameter
Dimensions
External dimensions are shown in figure below.
System Manual 3 Product Description

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Clearance Spaces
The clearances around the inverter should be sufficient for the doors to be opened.
3.2.3 Ventilation Design
The ventilation system is designed as the cool air comes inside from the top of the inverter
and hot air gets outside from the bottom of the inverter.
3 Product Description System Manual