High-Voltage Systems
High-Voltage SVG Dynamic Reactive Power Compensation System
The High-Voltage SVG Dynamic Reactive Power Compensation System (ZSBKSVG series) is an IGBT-based reactive power compensation system that provides continuous capacitive or inductive reactive power. It supports constant reactive power, constant voltage and constant power factor control at the measurement point. Installed near special loads such as arc furnaces, medium-frequency furnaces and refining furnaces in distribution networks, it improves power quality at the point of common coupling, including power factor, three-phase voltage balance, voltage flicker and fluctuation suppression, and harmonic mitigation.
Overview
The ZSBKSVG series is a chain-link inverter reactive power compensation system built around IGBT devices. Each phase of the chain-link inverter consists of multiple power modules connected in series, with N+1 or N+2 redundant operation. Module control uses an FPGA-based carrier phase-shifted multilevel space vector PWM strategy. Self-excitation starting limits inrush current at commissioning. Each module panel has four electrical terminals and two optical fiber terminals, with status and fault indicators for maintenance. The digital controller MLCCON is based on three DSPs and multiple FPGAs. Control mode (system compensation or load compensation, and load compensation harmonic order) can be set on site. A fast instantaneous reactive current control strategy supports continuous stable operation during system short-circuit faults. An imported PLC provides combined switching control of multiple fixed capacitor banks. The controller is fully enclosed and dust-proof without a cooling fan. Local monitoring is performed by the DSP and imported PLC with a Chinese/English touchscreen interface. The display panel shows power module DC voltage, module fault/bypass status, output current, load current, fault display and fault recall, and can display output current waveforms. A GPRS remote interface sends operating data, status and alarm information to a background server for real-time monitoring. Parameter settings are prompted in Chinese, all parameters have dual power-off retention, and overall backup and restore are supported. The control power supply uses multiple parallel modules with DC UPS backup, so operation is unaffected when AC control power is lost. Power modules and the main control system are connected by optical fiber. The main circuit uses a chain-link topology with star and delta connections. The product consists of a control cabinet, power cabinet and reactor cabinet; the power cabinet has a high degree of uniformity to facilitate capacity expansion. Cooling fans can be mounted directly on the cabinet top. Indoor and outdoor installation are both available.
Key features
- IGBT-based chain-link inverter with N+1 or N+2 redundant power modules
- FPGA carrier phase-shifted multilevel space vector PWM control
- Self-excitation starting for low inrush current
- Fully digital controller MLCCON based on three DSPs and multiple FPGAs
- On-site selection of system compensation or load compensation and harmonic order
- Fast instantaneous reactive current control for continuous operation during short-circuit faults
- Imported PLC for combined switching control of multiple fixed capacitor banks
- Fully enclosed dust-proof controller without cooling fan
- Chinese/English touchscreen human-machine interface
- Display of module DC voltage, fault/bypass status, output current, load current and current waveforms
- GPRS remote interface for operating data, status and alarm transmission
- Dual power-off retention and overall backup/restore of parameters
- Multi-module parallel control power supply with DC UPS backup
- Optical fiber connection between power modules and main control system
- Chain-link topology with star and delta connections
- Control cabinet, power cabinet and reactor cabinet configuration
- Cabinet-top cooling fan mounting
- Indoor and outdoor installation
Technical information
- Rated capacity
- ±0.5 Mvar to ±100 Mvar
- Rated voltage
- 6 kV, 10 kV, 27.5 kV, 35 kV
- System frequency
- 50 Hz
- Overload capability
- greater than 120%
- Response time
- ≤5 ms
- Active power loss
- ≤0.8%
- Total harmonic current distortion (THDi)
- ≤3%
- Control power supply
- AC380V, AC220V or DC220V
- Reactive power regulation
- automatic continuous smooth regulation, capacitive and inductive
- Communication interfaces
- Ethernet, RS485, CAN, high-speed optical fiber
- Communication protocols
- MODBUS_RTU, ProfiBUS, power CDT91, IEC61850-103/104, CANOPEN, user-defined
- Operating modes
- constant device reactive power, constant measurement-point reactive power, constant measurement-point power factor, constant measurement-point voltage, load compensation, six-period time control
- Parallel operation
- multi-unit parallel networking, multi-busbar comprehensive compensation, up to group C comprehensive compensation control
- Protection rating
- IP40 (indoor type)
- Protection functions
- output overcurrent, system short circuit, system voltage, T-wire break, overtemperature, water cooling fault, communication failure
- Model
- ZSBKSVG-4000-10
- Outdoor ambient air temperature
- -25℃ to +45℃
- Relative humidity
- 20% to 90% at 40℃
- Altitude
- 1000 m and below (above 1000 m to be specified)
Ratings shown relate to the pictured sample. Final ratings are confirmed against your order.
