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  • PCS-9580 Static Var Compensator

  • NR Electric’s PCS-9580 Static Var Compensator (SVC) system is a shunt reactive power compensation system with integrated control and protection system. It is based on the high-power thyristor semiconductor technology used to improve power system transmission and distribution performance. The stability and economy of power grid operations can be affected by active and reactive power disturbances caused by switching of large loads or other common system faults. The resulted over- current and over-voltage may damage the related electrical apparatuses. The PCS-9580 static Var compensator system can adjust the reactive power in the power grid to achieve a reasonable power flow distribution.

    Compared with traditional reactive power compensation methods, the PCS-9580 SVC system has extensively gained a significant application. This is primarily due to its superior performance in supplying dynamic reactive power with fast response time and with low-cost maintenance.

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The PCS-9580 static var compensation system consists of static var compensator and control & protection system which is used to protect capacitors and reactors in the valves.

The static var compensator is composed of thyristor controlled reactor (TCR), thyristor switched capacitor (TSC), thyristor switched reactor (TSR), and Breaker Switched Capacitor (BSC). The SVC can be considered as a dynamic reactive power source. It supplies reactive power to grid or consume spare reactive power from grid. Normally, the system can receive the reactive power from a capacitor group, and the spare part canbe consumed by an air-core shunt reactor.

Step-down Transformer

If no third winding of a main transformer can be used, a step-down transformer is needed.

Medium Voltage Switchgear

Medium voltage switchgear can be installed indoor or outdoor, including isolating switches, grounding switches and transformers.

Linear (Air-core) Reactor

Air-core reactors are more stable and have good linear performance. It is used to absorb or adjust the reactive power. Usually the air-core reactor is connected with the thyristor valve in series in Δ connection and then connected to the power grid.

Thyristor Valve

Thyristor valves are the main control part in the SVC system. The valve is composed of several series/parallel connected thyristor and the auxiliary components. The thyristor is controlled through optical fiber and it adopts water cooling as the main cooling method.

Capacitor/Filtering Banks

Capacitor/filtering banks can supply sufficient capacitive reactive power to power grid and filter harmful harmonics. It is composed of capacitors and other auxiliary components such as filtering reactors and filtering resistors. In practical, the capacitor/filtering banks are divided into several sub banks and can be connected/disconnection to system by breakers or other thyristor valves.

Water Cooling System

Water cooling system is necessary for thyristor valves which have high operating voltage. The cooling system uses deionized pure water for internal cooling and regular industrial recycling water for external cooling.

Control & Protection System

SVC operator control system, including operator workstation, LAN and printers, realizes SVC remote control, monitoring and event alarm functions in the control room.


Professional System Design

  • NR Electric takes into account RTDS, analog simulation environment and PSCAD in the design processes to study system stability, active and reactive power distribution and power quality as to optimize SVC system design.
  • Optimized filter groups can filter large amount of harmful harmonics, providing fundamental frequency reactive power and minimizing dynamic active power losses.
  • The customized SVC system can analyze system power quality to check injected harmonic current and filter resonance.
  • The optimal regulation modes will be selected based on the installation place to gain the most effective voltage/ reactive power regulation.

Thyristor Valve

NR Electric’s TCR valve has many advantages like compacted structures and light weight. Therefore ,occupying less area, and making valve installation and maintenance work much easier. The valve assembly is completed in factory before shipping to ease on-site installation. Only the electrical connection to reactor, the hydraulic connection to water cooling system and the optic connection to control devices are conducted on site.

Electric-optical triggering system

The electrical triggering system is comprised of two parts: the Valve Control Unit(VCU) in the control room and the Thyristor Control Unit(TCU) in the valve. The Control Pulse (CP) is converted to an optic Firing Pulse (FP) by VCU. This optic FP is then converted to an electric FP to trigger the thyristor. The conversion between optic to electric FP is conducted by TCU. If the thyristor is not forward biased or damaged, the control system will issue an alarm or stop operating according to the signal sent from TCU.

The optic triggering system uses light to trigger thyristor. It integrates forward overvoltage protection components, and thyristor management units are used instead of thyristor control units.

Thyristor breaker-over voltage protection

A thyristor can be damaged by a large size forward voltage if there is no current flowing thought the thyristor. Thus it is essential to force the thyristor to switch on before the voltage across the thyristor reaches the break-over voltage threshold. The break over diode (BOD) is usually used to protect thyristors from being damaged by forward overvoltage. However, a series connected BOD can cause a large deviation in the break-over voltage threshold. To solve this problem, NR Electric invented the unique circuit integrated thyristor protection valves. It reduces the breakover voltage deviation to a minimum value, so that the breakover voltage can be fixed manually in order to accommodate different types of thyristor.

Water Cooling System

NR Electric’s SVC system uses the industrial-class hermetic water cooling system with de-ionized water for heat dissipation. This patented cooling radiator features low thermal resistance and low water resistance. Due to their high reliability, NR Electric’s water cooling systems are currently utilized in several industrial sectors such as aviation, power generation and HVDC transmission.

Well-proven protection and control system

The protection and control of the Static Var Compensator system uses the same reliable software and hardware platform as the HVDC control and protection system. The highly integrated software platform uses graphic programming and test tools to realize diverse control functions. The universal hardware platform is equipped with multi-functional modular PCB to achieve data acquisition, control and monitoring functions.