新型平衡变压器谐波抑制技术研究

Research on technology of harmonic suppression for new balance transformer

为了解决单相大功率变流器和非线性负载给舰船电力系统带来的三相不平衡问题,首先分析了一种基于船用新型平衡变压器接线的谐波抑制系统,采用两个背靠背式运行的单相变流器实现实时谐波和无功补偿;然后,分析了谐波抑制系统的主电路结构,阐述了谐波抑制系统有功功率交换、无功功率补偿及谐波抑制原理;最后,利用Matlab建立了谐波抑制系统的仿真模型,对阻性负载和非线性负载两种工况下谐波及无功电流的补偿能力进行了仿真。仿真结果验证了该系统的正确性和有效性。

In order to solve the three-phase unbalance harm to ships′electric power system caused by single-phase high-power converter and nonlinear loads,a harmonic suppression system based on the connection of a novel balance transformer for ships is analyzed.Two single-phase converters operating back-to-back are adopted to achieve real-time harmonic and reactive power compensation.The main circuit structure of the harmonic suppression system is analyzed,while the principles of active power exchange,reactive power compensation and harmonic suppression of the harmonic suppression system are described.The simulation model of harmonic suppression system is established in MATLAB.Then,the compensation capability of harmonic and reactive current is simulated for two conditions,namely,resistive load and nonlinear load.The correctness and effectiveness of the system are verified.