基于比例正弦幅值积分器的地铁二重化能馈变流器控制

摘要

The SAI(Sinusoidal Amplitude Integrator) is applied to dual-series energy-fed converter for subway,which simplifies the control of converter and improves the control performance of converter in the stationary coordinate system.Starting from the digital realization of SAI,based on the frequency response analysis in discrete domain,the difference between the actual characteristics of discrete SAI and the ideal model of continous domain is analyzed,and the corresponding linear prediction phase compensation method is proposed.In order to improve the dynamic performance of the current loop,a virtual decoupling term is introduced in the current control loop to reduce the dependence of the current control on the SAI and improve the dynamic performance of the current loop.The closed-loop control of the voltage outer loop by voltage squared feedback is adopted to ensure the voltage balance of the two series converters through the pressure difference correction control and improve the response performance of the voltage loop through the proportional feed forward of the DC input current.Simulations and experiments verify the correctness and effectiveness of the proposed control strategy.%将正弦幅值积分器(SAI)应用于地铁二重化能馈变流器,在静止坐标系下简化了变流器的控制,同时提高了变流器的控制性能.从SAI的数字实现出发,在离散域对其进行频率响应分析,得到离散化SAI实际特性与连续域理想模型的差异,针对两者存在的差异提出了线性预测相位补偿方法.为了提高电流环的动态性能,提出在电流控制环引入虚拟解耦项,削弱电流控制对SAI的依赖,以此提高电流环的响应速度.提出在电压外环采用电压平方反馈进行闭环控制方法,通过压差修正控制保证2组串联变流器均压,并通过直流输入电流比例前馈进一步提高电压环响应性能.仿真和实验验证了所提控制策略的正确性与有效性.