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z LEHSVG Operation Manual

High voltage dynamic power compensation
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Summary of Contents for z LEHSVG

  • Page 2 LEHSVG User Manual Preface Thank you for using the LEHSVG series of products independently developed by our company. This manual is applicable to cascaded high-voltage dynamic reactive power compensation devices with voltage levels of 6 ~ 35kV. For safe and reliable use of this high-voltage It is strongly recommended that you read the contents of this manual thoroughly and pay special attention to the safety regulations and warnings.

  • Page 3: Table Of Contents

    2.3 LEHSVG series product features ................................12 Chapter 3 LEHSVG Product Introduction .................................14 3.1 Basic principles of LEHSVG reactive power compensation ......................14 3.2 Main technical parameters of LEHSVG ...............................15 3.3 LEHSVG models and specifications ..........
  • Page 4 ..........................43 Chapter 7 Debugging and using LEHSVG ..............................44 7.1 Overview........................................44 7.2 Precautions for starting and stopping LEHSVG..........................44 7.3 LEHSVG startup and shutdown operation steps..........................45 7.4 LEHSVG operation mode ..........

  • Page 5: Chapter 1 Safety Instructions

    LEHSVG User Manual Chapter 1 Safety Instructions The following "Danger", "Warning" and "Caution" are provided for your safety and to prevent the equipment and its related parts from being damaged. Some measures taken. When dealing with matters related to high-voltage dynamic reactive power compensation devices, the "dangers"...

  • Page 6: Transportation And Storage Instructions

    LEHSVG User Manual • Be aware of the risk of electric shock. If the grounding fails, the connecting part or system failure may result in phase loss between the cabinet shell and ground. A voltage difference of such magnitude that contacting the...

  • Page 7: Debugging Instructions

    LEHSVG User Manual • If the storage time exceeds half a year, the package should be opened for inspection, the desiccant should be replaced and then repackaged. 1.3 Debugging instructions warn • Untrained and qualified personnel working on the components/systems of this equipment or failing to comply with the relevant regulations in the warning may cause serious personal injury or significant property damage.

  • Page 8: Maintenance Instructions

    LEHSVG User Manual 1.5 Maintenance instructions warn Equipment maintenance can only be carried out by our company's service department, authorized repair • centers, or certified and authorized personnel. These personnel should be very familiar with all the warnings raised in this manual and the correct operating steps; Any defective components and devices must be replaced with the same components;...

  • Page 9: Chapter 2 Lehsvg Overview

    With the continuous development of the power grid, the need to control and compensate reactive power is increasing day by day. The most ideal solution currently is to use LEHSVG (Static Var Generator), also known as STATCOM (Static Synchronous Compensator). Its main function is to improve power grid stability, increase transmission capacity, eliminate reactive power shocks, suppress harmonics, balance three-phase power grids, reduce losses, and save energy and emissions.
  • Page 10 LEHSVG User Manual Application industry LEHSVG application features Control reactive power at power access points of wind power and photovoltaic power generation equipment to prevent reactive power backflow Wind power Stabilize the grid voltage and reduce voltage fluctuations caused by power generation fluctuations photovoltaic, etc.

  • Page 11: Lehsvg Design Specifications

    LEHSVG User Manual 2.2 LEHSVG design specifications LEHSVG series products meet the following main standards or provisions related to the provisions of these standards. GB/T 311.1-2012 Insulation coordination Part 1: Definitions, principles and rules GB/T 2900.1-2008 Basic terminology for electrical engineering GB/T 2900.32-1994 Electrical terminology power semiconductor devices...

  • Page 12: Lehsvg Series Product Features

    The LEHSVG series products, which are easy to operate, high-performance, and highly reliable, have been designed to meet the urgent needs of users to improve the power factor, control harmonics, and compensate for negative sequence currents in transmission and distribution networks.
  • Page 13 The target value can be changed in real time The LEHSVG design includes interfaces for use in conjunction with FC, achieving an effective combination of fixed compensation and dynamic compensation, providing users with more...

  • Page 14: Chapter 3 Lehsvg Product Introduction

    When the load exhibits capacitive characteristics, the voltage phase lags behind the current phase. The basic principle of the LEHSVG series products is to connect a self commutating bridge circuit in parallel to the power grid through a transformer or reactor, adjust the amplitude and phase of the AC side output voltage of the bridge circuit appropriately, or directly control its AC side current to absorb or emit reactive current that meets the requirements, achieving the purpose of dynamic reactive power compensation, as shown in Table 3.1.

  • Page 15: Main Technical Parameters Of Lehsvg

    LEHSVG User Manual If VSVG >Vnet, then Ils is the leading current. capacitive operating Equivalent to a mode continuously adjustable capacitor 3.2 LEHSVG main technical parameters name content 6kV±10%～35kV±10% Rated voltage 6kV±10%～500kV±10% Assessment point voltage 0.9～1.1pu Input voltage 0pu（150ms）0.2pu(625ms) Low voltage ride through 1.2~1.3pu(Can be set as 1s)

  • Page 16: Lehsvg Models And Specifications

    Note: Capacity (Mvar) represents the rated maximum regulation capacity within the dynamic regulation range from inductive reactive power to capacitive reactive power. For example, LEHSVG-10/2 represents a direct mounted 10kV device with a capacity of 2Mvar. Capable of continuously smoothing reactive power within the range of 2000kvar...

  • Page 17: Chapter 4 Lehsvg Device Structure

    Chapter 4 LEHSVG device structure 4.1 LEHSVG system structure The main circuit of the LEHSVG series products adopts a chain topology structure, modular structural design, and star and triangle connection methods to achieve maximum cost-effectiveness under different capacities, ensuring the effectiveness of user investment and stable, efficient, and high-quality operation of the power system.
  • Page 18 LEHSVG User Manual Figure 4.2 6-10kV indoor high voltage model (for reference only) Figure 4.3 6-35kV outdoor container model (for reference only)
  • Page 19 Figure 4.5 LEHSVG prefabricated cabin model (for reference only) The LEHSVG series products are mainly divided into four parts: control cabinet, power cabinet, reactor cabinet (if using a hollow core reactor, this cabinet is not available), and heat dissipation system. The power cabinet achieves great uniformity, facilitating the expansion and stability of product capacity.

  • Page 20: Power Cabinet

    4.2 Power cabinet The power cabinet is mainly composed of power units, which constitute the main body of LEHSVG reactive power compensation. The power unit is installed in three phases, with equal numbers of units in each phase. The output waveform of the units is superimposed into the overall output waveform of the machine.
  • Page 21 LEHSVG User Manual Figure 4.6 Arrangement of units in air-cooled power cabinet Figure 4.7 Arrangement of units in water-cooled power cabinet The power unit (see Figure 4.8) is equipped with various circuit boards. In addition to the sampling circuit, protection circuit, and output drive circuit, all logic and communication processing in the unit control section are completed using large-scale CPLD chips.
  • Page 22 LEHSVG User Manual Figure 4.8 Power unit (module) DC capacitors are carefully selected from well-known brands of thin film capacitors and special vapor deposition materials, which not only meet the requirements of high voltage and high current shocks but also have good self-healing properties, providing strong guarantees for product reliability;...

  • Page 23: Reactor Cabinet

    The LEHSVG series products are connected to the power grid through reactors, resulting in better sinusoidal current waveforms. At the same time as smoothing the reactor, it also suppresses the harmonics of LEHSVG, making its output current harmonics comply with national standards. The separate design of the reactor cabinet is beneficial for users to have a higher utilization rate of space, greatly alleviating the limitations of space on the use of the equipment, reducing user investment in equipment to a certain extent, and saving expenses.

  • Page 24: Control Cabinet

    Serial communication is used between the main control box and PLC, as well as between the main control box and the human-machine interface. The communication connection between the main control box boards realizes hierarchical control of the system, achieving the desired control objectives, monitoring the operating status of LEHSVG, and communicating with the upper computer.
  • Page 25 DSP and a large-scale programmable logic device CPLD/FPGA. A carefully designed algorithm can ensure that LEHSVG achieves optimal operational performance. The controller adopts large-scale integrated circuits and surface welding technology, utilizing automated welding equipment for ICT and FCT detection, greatly eliminating the unstable impact caused by manual participation, and the system has extremely high reliability.
  • Page 26 Figure 4.16 HMI selected by LEHSVG (for reference only) LEHSVG adopts this type of HMI, providing a friendly all Chinese monitoring and operation interface. It adopts advanced human-machine communication skills to achieve free control of equipment start and stop operations.

  • Page 27: Cooling System

    ● System information inquiry, parameter inquiry, and parameter setting, etc; ● Fault inquiry and historical fault inquiry. 4.5 Cooling system The power cabinet part of LEHSVG reactive power compensation device adopts forced air cooling or water cooling system for forced cooling. 4.5.1 Forced air cooling for heat dissipation Figure 4.17 Cabinet top fan for forced heat dissipation (for reference only)
  • Page 28 LEHSVG User Manual pieces etc. Figure 4.18 Water cooling system diagram (for reference only) 4.5.3 Water-cooled control cabinet Figure 4.19 Water-cooled control cabinet (for reference only) The water cooling control system adopts a cabinet structure design, and the main circulation pump is the power source of the pure water cooling device.
  • Page 29 LEHSVG User Manual 4.5.4 Water-to-air heat exchanger Figure 4.20 Water-cooled water-air heat exchanger (for reference only) The heat carrying medium enters the water air heat exchanger and is carried away by forced air, achieving the purpose of heat exchange. The heat exchanger adopts a plate fin heat dissipation method, with a simple and compact overall structure, which can ensure that pure water is evenly distributed in the aluminum plate cavity.

  • Page 30: Chapter 5 Introduction To Touch Screen (Hmi)

    LEHSVG User Manual Chapter 5 Introduction to Touch Screen (HMI) 5.1 HMI system framework Figure 5.1 HMI architecture 5.2 HMI page function introduction 1) Device monitoring page: Displays system and device power parameters and operations on the entire machine such as opening and closing, starting and stopping.
  • Page 31 LEHSVG User Manual 7) Unit status page: displays the status of each unit. 8) Protection status 1 page: displays information such as high-speed communication faults and complete machine faults. 9) Protection status 2 page: Displays information such as carrier configuration failure and H-bridge configuration failure.
  • Page 32 LEHSVG User Manual Figure 5.3 Device monitoring interface (local mode) Figure 5.4 Device monitoring interface (remote mode) Figure 5.5 The red box in the figure indicates the menu selections for entering each sub-interface. 1) Analog quantity query: query analog quantities such as unit voltage, temperature (to be customized), harmonic current, device reactive power, and parallel machine data.
  • Page 33 LEHSVG User Manual Figure 5.7 Unit voltage display interface Figure 5.8 Unit temperature display interface 2) Status quantity query: Query the basic status of the unit, PLC input and output point status, etc. Figure 5.9 is the unit status interface (star-shaped connection) Figure 5.9 Unit status interface...
  • Page 34 LEHSVG User Manual 3) Fault recording: Figure 5.10 is the fault recording interface, which can record fault instantaneous voltage and current waveforms; 4) Fault recording: Figure 5.11 shows the fault recording interface, which can record specific fault information; Figure 5.10 Fault recording interface Figure 5.11 Fault recording interface...
  • Page 35 LEHSVG User Manual Figure 5.12 LEHSVG touch screen water cooling control interface...

  • Page 36: Chapter 6 Storage And Installation

    Chapter 6 Storage and Installation 6.1 Overview Our company adheres to the principle of quality first and user priority, and optimizes the design principles of LEHSVG. We strictly follow quality standards in various aspects such as device selection, production manufacturing, factory testing, and installation, ensuring high reliability and stable operation of the product under normal usage conditions.

  • Page 37: Mechanical Installation

    Electrical usage conditions Notice The LEHSVG control power supply is AC380V, AC220V, or DC220V power supply. Please refer to the wiring diagram of the random transportation for capacity. The continuous fluctuation deviation of AC voltage is+7% to -10%. 6.4.2 Equipment appearance and cabinet loading, unloading and installation Taking the 10kV/4Mvar LEHSVG water-cooled model as an example, its exterior front view is shown in Figure 6.1, and the...
  • Page 38 Figure 6.3 LEHSVG-10/4-W left view When installing the LEHSVG series product equipment, consideration should be given to the needs of ventilation, heat dissipation, and operating space. The distance between the front of the entire device and the wall should not be less than 1500mm, the distance between the back of the device and the wall should not be less than 1000mm, and the distance between the left and right sides of the device and the wall should not be less than 1000mm, as shown in Figure 6.3.
  • Page 39 30 °. The installation site of the device should take comprehensive small animal protection measures. The LEHSVG series high-voltage dynamic reactive power compensation device is shipped separately with the control cabinet, power cabinet, and power unit during transportation. Power unit spare parts (if any) and fans on each cabinet top are packaged and transported separately.

  • Page 40: Electrical Installation

    LEHSVG User Manual Attention: When lifting, it is necessary to pay attention to the rope or metal beam passing through the appropriate forklift hole of the channel steel, and try to align the lifting center with the center of gravity of the lifted cabinet as much as possible, rather than the geometric center of the cabinet.
  • Page 41 The equipment requires the user to provide a stable and reliable power supply (three-phase four wire AC380V, AC220V or DC220V power supply) on site. For power capacity and wiring specifications, please refer to the attached "LEHSVG Control Cabinet External Wiring Terminal Diagram". It is recommended that the user use a 5-core cable to provide 380V AC power supply for the cooling centrifugal fan.
  • Page 42 • It is not possible to change the three-phase input into a two-phase input. • The signal lines connected to LEHSVG on site should be routed separately from strong current wires. It is best to use shielded wires for signal lines.One end of the shielding wire is reliably grounded.

  • Page 43: Fire Protection Requirements

    To establish communication with the upper computer, this device uses standard MODBUS_ RTU communication protocol and IEC60870-5-104. LEHSVG parallel operation relies on our company's mature communication mode to use fiber optic communication, ensuring the safe and reliable operation of parallel operation devices, improving the tracking speed of slave machines, and achieving the grid connection requirements of large capacity LEHSVG.

  • Page 44: Chapter 7 Debugging And Using Lehsvg

    7.1 Overview Notice! After the LEHSVG equipment arrives at the site and the installation and wiring are completed, the equipment needs to be inspected before the control power and main power are connected.

  • Page 45: Lehsvg Startup And Shutdown Operation Steps

    LEHSVG User Manual 2) LEHSVG is a high-voltage equipment. You must be aware of the dangers of high voltage during operation and strictly abide by the operation manual. 3) The relevant parameters in LEHSVG have been set before leaving the factory. If you do not have enough understanding of LEHSVG and the load system,Please do not change parameters at will, otherwise it may cause system abnormalities or even major accidents.
  • Page 46 In order to ensure that the LEHSVG device can operate in the optimal state on site, the parameters of the device have been optimized during company and on-site debugging. Please do not make any necessary changes. If there are any changes to the system, please consult our company.
  • Page 47 Figure 4.3. 5) Close the air switch QF3 of the LEHSVG control cabinet fan power supply. After the power is delivered, press and hold the AC contactor KM2 protruding on the control fan (as shown in Figure 7.3. If there is no model with this contactor, please contact our after-sales personnel for fan turning test under their guidance) or the corresponding contactor's moving iron core for about 2 seconds, release it, and observe whether the fan turning is consistent with the icon.
  • Page 48 LEHSVG higher-level high-voltage switchgear. 10) After the main power is sent to LEHSVG, each power unit starts working and performs self check. The "High Voltage" light on the HMI device monitoring page lights up, indicating that the main power has been delivered and the next step can be taken.

  • Page 49: Lehsvg Operation Mode

    LEHSVG User Manual 2) Click the HMI "disconnect" button to disconnect the LEHSVG main switch. Attention: At this time, there is still high voltage in the main circuit, and it is prohibited to open the cabinet door. 3) Remote operation to disconnect the circuit breaker of the superior switchgear and switch the switchgear to hot standby 4) Manually shake out the upper level switchgear trolley, turn it to cold standby, and ground it.

  • Page 50: Chapter 8 Lehsvg Maintenance Precautions

    • The user's fault maintenance is limited to recording the fault phenomenon and replacing the unit if necessary. Further repairs should be handed over to the manufacturer for processing. • Unit replacement can only be performed after the main power supply of LEHSVG has been out for more than 15 minutes.

  • Page 51: Daily Inspection Items

    During inspection, do not get too close to live devices such as power cabinets and reactors. • Check whether there are any abnormal vibrations, sounds, smells, or smoke near the equipment. • Check whether there is any alarm message on the LEHSVG touch screen interface, and whether the relevant temperature and voltage display is normal.

  • Page 52: Regular Maintenance Items

    • Irrelevant personnel are not allowed to operate, maintain, inspect, etc. this equipment! • After the LEHSVG system is shut down, the DC bus of the power unit still has residual voltage, and the capacitor must be fully discharged before the power can be regenerated.
  • Page 53 • Close the LEHSVG switchgear grounding knife • Check that the LEHSVG switchgear switch grounding knife is in the closed position • Hang a sign saying “Someone is working, closing is prohibited” on the switch and starter cabinet of LEHSVG switchgear.
  • Page 54 • Remove dust and foreign matter on the surface and inside of the cabinet Cabinet and fan • For the air-cooled LEHSVG system, it is necessary to remove the dust from the power cabinet filter screen; The water-cooled LEHSVG system needs to clean the dust on the outdoor radiator fan •...

  • Page 55: Chapter 9. Handling Of Frequently Asked Questions

    Usually, all faults will cause LEHSVG to immediately shut down, disconnect the main switch for grid connection, and provide a signal for tripping the upper switchgear. Users can define some minor faults that do not affect the normal use of LEHSVG.

  • Page 56: How To Replace A Faulty Unit

    Step 5: Pull out the faulty unit along the track (do not touch the optical fiber) and handle it gently; For small capacity LEHSVG, the fastening bolts at the back of the unit need to be loosened.
  • Page 57 LEHSVG User Manual Step 2: Operate the higher-level switchgear to the cold standby state, while disconnecting the isolation switch of the LEHSVG body and ensuring reliable grounding of the grounding switch; Step 3: Observe the HMI unit bus display, confirm that the unit bus voltage has changed to 0V, wait for 15 minutes, and disconnect QF1, QF2, and QF3;...

  • Page 58: Chapter 10 Service And Warranty

    • Warranty rules Warranty scope ◇ The warranty scope refers to the LEHSVG device and accessories provided by our company; In case of malfunction or damage during normal use, our company is responsible for free maintenance of the equipment within 12 months of normal operation.

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