基于多谐振控制器和电容电流反馈有源阻尼的PWM变换器电流环参数解耦设计  

Decouple Design of Current Loop Parameters for PWM Converters Based on Multi-resonant Controllers and Capacitor Current Feedback Active Damping

作　　者：吕永灿[1] 林桦[1] 杨化承[1] 罗咏[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),湖北省武汉市430074

出　　处：《中国电机工程学报》2013年第27期44-51,8,共8页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2010CB227206)~~

摘　　要：基于电容电流反馈有源阻尼的LCL型脉宽调制(pulse width modulation,PWM)变换器并网电流控制中,通常采用多谐振比例谐振(proportional resonant,PR)控制器来实现静止坐标系下正弦电流给定的无静差跟踪和抑制电网电压特定次谐波影响。针对电流环控制器复杂、参数多、设计难的问题,采用频率域理论分析电容电流反馈系数和准PR控制器各参数对电流环性能的影响。在此基础上,提出一种电流环控制器参数解耦简化解析设计方法,根据稳定性、稳态误差和相位裕度要求,分别设计电容电流反馈系数及PR控制器相对谐振增益系数和比例系数。该设计方法简化了控制器参数之间的耦合关系,且多采用解析计算,不需要反复试凑。实验结果验证了所提出的参数解耦解析设计方法是可行和有效的。To track the given sinusoidal current under stationary frame and suppress the effect of the low harmonics in the grid, a multi-resonant proportional resonant （PR） controller was adopted for pulse width modulation （PWM） converter with LCL filter based on capacitor current feedback active damping. Because the system is of high order, many parameters and complicated, the effects of the control parameters on the current-loop performance were investigated with frequency theory, i.e. the stability, steady-state error and phase margin. Based on this, a decoupling-simplified analytic design method was proposed. According to the requests of the stability, steady-state error and phase margin, the capacitor- current-feedback coefficient, the relative resonant gain factor and the proportional factor could be designed separately. The proposed method uses the analytic method and simplifies the couple of the parameters without trial-and-error procedure. Finally, a battery storage power conversion system （PCS） was built. Experiment results verify the effectiveness of the proposed design method.

关 键 词：LCL滤波器 有源阻尼 电容电流反馈 多谐振准PR控制器 

分 类 号：TM46[电气工程—电器]