A novel high-voltage reactive power compensation method based on magnetic-controlled switch

作者：Tao Kun^*; Chen Qiaofu; Zhou Libing; Huang Jiang; Wang Ninglai; Liu Jianben

来源：Proceedings of the CSEE, 2013, 33(30): 136-144.

• Compensation capacitors
• Dynamic reactive power compensations
• High-voltages
• Magnetic controlled
• Reactive power compensation
• Static synchronous compensator
• Thyristor controlled reactors
• Thyristor switched capacitor

Currently, under the voltage grade from 10 kV to 35 kV, there's no satisfactory solution to the problem of dynamic reactive power compensation for load whose need for reactive power varies in a large range. The common solutions are high-voltage thyristor switched capacitors (HVTSC), thyristor controlled reactor (TCR), magnetic-valve controllable reactor (MCR), and static synchronous compensator (STATCOM). However, both HVTSC and TCR use many thyristor valves connected in series, which requires not only a highly qualified trigger system but also a large amount of thyristors that leads to huge cost. Meanwhile, MCR inevitably generates harmonics and consumes considerable power when the load is light. STATCOM consists of many cascaded inverter blocks under high voltage condition, resulting in the decrease of reliability and increase of cost. Therefore, a novel high voltage reactive power compensation method based on magnetic-controlled switch (MCS) is proposed in this paper. Triacs are connected in parallel with the secondary winding of a transformer as switching components, and in this way the impedance of the transformer at primary side exhibits either a small leakage reactance or a large excitation reactance, during which the transformer behaves like a contactless switch to implement the dynamic switch of compensation capacitors. Simulation and experiments have verified the advantages such as small transient inrush, rapid response speed, low loss, and high reliability.

• 出版日期2013
• 单位华中科技大学