摘要
单相Quasi-Z源逆变器交流侧二倍基波频率(二倍频)的功率脉动会使其直流侧不可避免的出现二次纹波。针对单相Quasi-Z逆变器直流侧电感二倍频电流纹波问题提出了一种自注入APF控制策略。运用状态空间平均法研究二倍频能量的传递机理,结合Quasi-Z源网络小信号模型,发现占空比扰动可以影响Quasi-Z源网络能量分布。在直通占空比上叠加补偿信号,在不改变电路拓扑结构的前提下,利用Quasi-Z源网络向逆变桥自注入二倍频能量,抑制Quasi-Z源网络输入功率波动。仿真验证了所提控制策略的有效性,Quasi-Z源网络输入电流纹波幅值降低了 81.4%,并结合反馈控制方法对所提控制的响应速度进行了仿真对比分析。
The double frequency power flows through the DC side leads to double frequency ripple for single-phase Quasi-Z-source inverter. This paper proposes a ripple self-injection active power filter control scheme to eliminate double frequency ripple of input current for Quasi-Z-source network. Using the state space averaging and small signal analysis method, the small transmission mechanism of double frequency ripple was got. The Quasi-Z-source network injected double frequency power into inverter bridge by adding a double frequency compensation signal to the shoot-through duty ratio for boosting. And the input power fluctuation of Quasi-Z-source network was suppressed without changing the circuit of single-phase Quasi-Z-source inverter. Last, simulation results were given to demonstrate the validity and rapidity of the proposed control scheme.
作者
李志勇
王思君
陈有根
LI Zhi-yong;WANG Si-jun;CHEN You-gen(School of Automation, Central South University,Changsha 410083,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2019年第10期77-84,共8页
Electric Machines and Control
基金
湖南省自然科学基金(2015JJ2171)
关键词
QUASI
Z
源逆变器
纹波
传递机理
自注入
Quasi-Z-source inverter
ripple
transmission mechanism
self-injection
