一种新型的MMC-RPC功率控制策略

A novel power control strategy for MMC-RPC

为综合治理牵引供电系统中的电能质量问题,分析V/v变压器左右两侧供电臂上的功率关系,通过有功功率平衡、无功功率补偿以及谐波功率分离等方式综合治理无功功率、谐波、负序等电能质量问题。同时,在对基于模块化多电平的铁路功率调节器(MMC-RPC)直接功率控制的基础上引入微分平坦控制理论。选取供电臂上的有功和无功功率作为系统的输出量,并结合微分平坦理论证明其满足微分平坦条件,使得整个MMC-RPC为微分平坦系统。控制系统由前馈控制与误差反馈控制两部分组成,前馈控制环节产生主控制量,反馈控制环节产生修正控制量。在MATLAB/Simulink中搭建仿真系统,模拟不同的工况进行仿真,并与其他控制方式进行对比,所得结果验证了该控制策略的有效性与优越性。

In order to harness the power quality problems of traction power supply system comprehensively,the power relationship between the left and right power supply arm of a V/v transformer is analyzed.The reactive power,harmonic,negative sequence and other power quality problems are comprehensively harnessed by means of active power balance,reactive power compensation,harmonic power separation and so on.Meanwhile,the differential flatness control theory is introduced to the direct power control for MMC-RPC（Railway Power Conditioner based Modular Multilevel Converter）.The active power and reactive power of the power supply arm are selected as the output of the system,in which the differential flatness condition can be satisfied according to the differential flatness theory.Consequently,the whole MMC-RPC system is a differential flatness system.The control system consists of two parts,feed forward control and error feedback control.The feed forward control provides the main control variables,while the feedback control corrects the error.The simulation system considering different conditions is built on MATLAB/Simulink.Simulative results verify the effectiveness and superiority of the proposed control strategy compared with other control methods.