LCL型逆变器的改进WACC前馈相位补偿方法  

Improved WACC Feedforward Phase Compensation Method for LCL Inverter

作　　者：韩文涛 杨明[1] 赵月圆 王浩 HAN Wen-tao;YANG Ming;ZHAO Yue-yuan;WANG Hao(Henan Key Laboratory of Intelligent Detection and Control of Coalmine Equipment,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学,电气工程与自动化学院(河南省煤矿装备智能检测与控制重点实验室),河南焦作454003

出　　处：《电力电子技术》2023年第8期21-24,共4页Power Electronics

基　　金：国家自然科学基金(U1804143);河南省自然科学基金资助项目(212300410147)。

摘　　要：加权平均电流控制(WACC)方法因其对并网逆变器固有的降阶特性而备受关注。然而传统WACC并未充分考虑数字控制延时对系统造成的影响,数字控制延时引起的反向谐振峰使并网系统不易稳定。鉴于此这里从并网系统的等效模型对网侧电流稳定性进行重新审视,提出了一种在公共连接点(PCC)电压前馈串入新型一阶复数滤波器的方案,以此提高输出阻抗在低频段的相位,保证并网系统的相位裕度以及高渗透率条件下的稳定性。最后通过实验研究验证了所提策略的有效性。Weighted average current control(WACC)method has attracted much attention due to its inherent reduced order characteristics for grid-connected inverters.However,the traditional WACC does not fully consider the impact of digital control delay on the system,and the reverse resonance peak caused by digital control delay makes the gridconnected system unstable.In view of this,the grid-side current stability from the equivalent model of grid-connected system is re-examined,a novel first order complex filter with voltage feedforward at point of common connection(PCC)is proposed.In order to improve the phase of the output impedance in the low frequency band,ensure the phase margin of the grid-connected system and ensure the stability of high permeability.Finally,the effectiveness of the proposed strategy is verified by experimental research.

关 键 词：逆变器 加权平均电流控制 数字控制延时 一阶复数滤波器 

分 类 号：TM464[电气工程—电器]