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NR Electric Co., Ltd. Static Var Compensator (SVC) Solution Modern society has relied consistently on electrical power, requiring higher demands of power stability and power quality. But high-power rapid impact loads, asymmetrical impact loads, inevitable power system faults and so on are adverse factors which can lead to considerable reactive disturbances in power system and affect power stability, power quality and economy of power grid operation. To solve this problem, it is essential to adjust reactive power in the power grid expeditiously to achieve a reasonable power flow distribution. Structure NR Electric’s SVC system consists of the following devices: • Step-down transformer • Intermediate voltage switch cabinet • Linear (air) reactor • Thyristor valve group • Filter banks • Cooling system • SVC control and protection system NR Electric’s Static Var Compensator (SVC) solution can facilitate the utility and industry to realize reliable voltage regulation, effective active power control and load flow control, therefore to enhance the quality of power supply. NR Electric’s SVC solution can be widely applied to power transmission systems, industry fields and renewable energy grid access. Benefits • Voltage regulation • Enhance PF • Power oscillation damping • Line loss minimization • Stability improvement • Energy saving • Increasing productivity Read more on the web www.nrec.com 69 Suyuan Avenue, Jiangning Nanjing 211102, China Email: [email protected] [email protected] Static Var Compensator (SVC) Solution Step-Down Transformer The SVC valve is always connected to middle voltage bus in substation, and a step-down transformer is required in case of abnormally high voltage levels in the incoming line. Medium Voltage Switchgear A medium voltage switchgear can be installed indoor or outdoor. It includes isolating switches, grounding switches and circuit breakers. Linear (air-core) Reactor Air-core reactors are stable and have good linear performance. An air-core reactor can be used to absorb or adjust the reactive power. Usually the air-core reactor is linked in series with the thyristor valve using delta connection, and then connected to the power grid. Thyristor Valve Thyristor valves are the main component of SVC system. The valve is composed of several series/parallel connected thyristors and the auxiliary components. Each thyristor is controlled through optical fibers and is cooled down by the water cooling method. Capacitor/Filtering Banks Capacitor/filtering banks can supply sufficient capacitive reactive power to a given power grid and filter harmful harmonics. Banks are composed of multiple capacitors and other auxiliary components such as a filtering reactor and filtering resistors. Water Cooling System A water cooling system is necessary for thyristor valves, which have high operating voltage. The cooling system uses deionized pure water as the internal cooling medium and air for external cooling. Control & Protection System SVC control system is composed of an operator workstation, LAN and printers. It realizes SVC remote control, monitoring and event alarm functions from the control room. Functions and Features Professional 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 ,smaller footprint, and easy to install and maintenance. Electric-optical Triggering System 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 NR Electric invented the unique circuit integrated thyristor protection valves. It reduces the break-over voltage deviation to a minimum value, so that the break-over voltage can be fixed manually in order to accomodate 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. Well-proven protection and control system The protection and control of the Static Var Compensator system 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. Read more on the web www.nrec.com 69 Suyuan Avenue, Jiangning Nanjing 211102, China Email: [email protected] [email protected]