基于星形三角形接线多功能平衡变压器的负序和谐波综合治理系统

Comprehensive negative-sequence and harmonic suppression system based on Y-D multi-function balance transformer

基于各种单相用电场合供电系统中普遍存在的负序和谐波问题,提出了一种负序和谐波综合治理系统。该系统由星形三角形接线多功能平衡变压器(可实现三相变两相和三相变三相)、三相全桥型有源功率调节器等组成。系统充分利用了平衡变压器的平衡潜能,使得有源功率调节器的容量得以降低,且电压等级灵活可调,降低了装置成本,可实现负序、谐波和无功的综合治理功能。阐述了系统补偿原理及检测控制方法。对系统在负载不平衡以及负载波动2种工况下进行了仿真和试验研究,结果证明了补偿原理及检测方法的正确性。

Aiming at the negative-sequence and harmonic problems commonly existed in different sing/e- phase power supply systems,a comprehensive suppression system is proposed,which consists of a Y-D multi- function balance transformer （three-phase to two-phase and three-phase to three-phase）,a three-phase full- bridge active power regulator,etc. It makes full use of the balance transformer to decrease the capacity of the active power regulator,flexibly change the voltage level,lower the device cost and achieve the comprehensive suppression of negative-sequence ,harmonic and reactive power. Its compensation principle and detection control method are described. The system is simulated and tested under the operating conditions of load imbalance and load fluctuation and the results prove the correctness of its compensation principle and detection control method.