基于单周期和LCL型有源阻尼Z源逆变器并网研究  

Grid-connected Z-source inverter based on single-cycle and dual-current loop

作　　者：杨旭红 孙克帅 何超杰 YANG Xuhong;SUN Keshuai;HE Chaojie(Automatic Engineering of Shanghai University of Electric Power, Shanghai 200090,China;State Grid Hangzhou Lin'an District Power Supply Co., Ltd., State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 311300,China)

机构地区：[1]上海电力大学自动化工程学院,上海200090 [2]国网浙江省电力有限公司杭州市临安区供电有限公司,浙江杭州311300

出　　处：《电力科学与技术学报》2021年第2期155-161,共7页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(61203224);上海市重点科技攻关计划(14110500700);上海自然科学基金(13ZR1417800)。

摘　　要：Z源逆变器克服了传统电压型逆变器只能降压不能升压、必须加入死区时间等缺点,在实际中得到了广泛应用。针对传统PWM控制和L型、LC型滤波器的缺陷,采用单周期和LCL型有源阻尼控制方案进行三相Z源逆变器并网控制。单周期控制较传统PWM控制具有结构简单、高次谐波含量低等优点,LCL滤波器较LC、L型滤波器滤波性能优越,但谐振峰值会降低系统稳定性,因此,采用滤波电容电流反馈有源阻尼法构成陷波器来矫正LCL滤波器谐振峰值对系统稳定性的影响。最后,在Simulink环境下进行仿真测试,验证了所提方案的可行性和有效性。The Z-source inverter has been widely used because it overcomes the shortcomings of the conventional voltage-type inverter that can only be stepped down and cannot be boosted,and must be added to the dead time.This paper proposes a single-cycle and LCL active damping control scheme to control the grid connection of three-phase Z-source inverter.Compared with the traditional PWM control,the single-cycle control has the advantages of simple structure,low-harmonic content and high output power quality while the LCL filter performs better than the LC and L filters,but the resonance peak reduces system stability.Therefore,the active damping method is adopted and the filter capacitor current loop and the grid-connected current loop are introduced to form a double loop control structure to suppress the adverse effect of the resonance peak on the system stability.Finally,simulations under Simulink verify the feasibility and effectiveness of the proposed scheme.

关 键 词：Z源逆变器 单周期控制 有源阻尼法 直通信号 LCL滤波 

分 类 号：TM727[电气工程—电力系统及自动化]