变压器式可控电抗器静态无功功率双向控制原理研究

Research on the Bidirectional Control Principle of Reactive Power Based on a Transformer Type Controllable Shunting Reaction

针对目前柔性交流输电领域中广泛采用和研究的变压器式可控电抗器,提出一种双向无功控制原理,通过提高其副边补偿绕组中高次谐波滤波器电容的大小,实现不仅能吸收无功,而且可发出无功的双向补偿功能,从而在高压输电线路输送功率变化时,通过快速调整装设在控制绕组中的单个晶闸管模块的导通角,即可实现无功功率静态输出或吸收2种工作方式的控制,从而实现输电线路无功的柔性补偿。通过实验分析研究,证明所提出原理的可行性与正确性。

A fundamentally new circuit of a static thyristor compensator based on a controllable shunting reactor of a tran- sformer type （CSRT） is described in this paper. It is shown that, when a large capacitor or a capacitor bank is connected to the compensating winding of the CSRT （in parallel with the higher harmonic filters）, and when the control winding of the CSRT is opened or the thyristor control angles are close to 180~, the CSRT operates as a source of reactive power. By properly choosing the capacitance of the capacitor, it is possible to obtain any desired relation between the rated capacitive and inductive current of the compensator. The compensator is controlled using a single thyritor unit, which shunts the control winding of the compensator. Experimental analysis of actual research proves the feasibility and correctness of principles.