铁路功率调节器中谐波抑制策略研究

Study of Harmonic Suppression Strategy in Railway Static Power Conditioner

为提高铁路功率调节器(RPC)在高速铁路中的谐波抑制性能,提出一种改进谐波抑制策略,从控制器自身与控制器的结构两方面进行分析。控制器方面主要分析了准比例谐振(QPR)控制。为提高QPR在谐振点处的开环增益并降低其在非谐振点处的增益,对其增加了零点并省去比例项。控制器结构方面将基波控制器与谐波控制器分离,对各单次谐波进行独立抑制,从闭环频谱图上分析新的结构在谐波环境中也能有效抑制谐波。实验结果验证了该策略在RPC谐波抑制中的可行性与有效性。

In order to improve the harmonic suppression performance of railway static power conditioner（RPC） in high speed railway, an improved harmonic suppression strategy is proposed, which is analyzed from the controller itself and the controller structure.The controller mainly analyzes quasi-proportional resonance （QPR） control.To increase the open- loop gain at QPR at the resonant point and reduce its gain at non-resonant points, zero point is added to it and the proportional term is omitted.In the aspect of controller structure, the fundamental controller is separated from the har- monic controller, and the single harmonic is independently suppressed.The new structure can also effectively suppress the harmonic in the harmonic environment from the closed-loop spectrum.The experimental results verify the feasibility and effectiveness of the strategy in the harmonic suppression of RPC.