基于逆变器交流侧的四开关功率解耦技术研究  

Research on four-switch power decoupling circuit based on AC-side of an inverter

作　　者：章勇高[1] 付伟东 刘鹏[1] 樊越 ZHANG Yonggao;FU Weidong;LIU Peng;FAN Yue(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学电气与电子工程学院,江西南昌330013

出　　处：《电机与控制学报》2023年第8期142-153,共12页Electric Machines and Control

基　　金：国家自然科学基金(51467006)。

摘　　要：针对两级式单相逆变器常用大容量电解电容来缓冲其固有的二倍频脉动功率,大大降低其耐用性和可靠性这一问题,本文在保证变换器稳定运行的前提下提出了一种四开关功率解耦电路,对降低逆变器电容总容值具有实际工程意义。分析讨论解耦电路的工作原理,通过对4种不同的工作模式进行分析,从而确定解耦主电路各个开关管开关时序。在此基础上,设计了相应的脉冲能量调制策略以实现瞬时能量的精准补偿,提升了四开关功率解耦电路的解耦性能,改善了两级式逆变器交直流侧波形质量。该方案逆变电路与功率解耦电路相互独立,有利于传统设备的改造。最后,搭建了仿真模型和实验样机,仿真和实验结果验证了增加交流侧四开关功率解耦电路后,变换器只需几十μF的薄膜电容就能对二倍频脉动功率进行有效解耦。Large-capacity electrolytic capacitors are often used to buffer the inherent double frequency pulsation power of two-stage single-phase inverters,which greatly reduces their durability and reliability.In this paper,a four-switch power decoupling circuit is proposed to solve the problem by ensuring the stable operation of the converter,which has practical engineering significance for reducing the total capacitance of the inverter.The principle of decoupling circuit was analyzed and discussed,through the analysis of four different working modes,so as to determine the switching time sequence of each switch tube of decoupling main circuit.Therefore,a corresponding pulse energy modulation strategy was designed to achieve precise compensation of the transient energy,which improves the decoupling performance of the converter and waveforms quality in both the AC-side and DC-side.The inverter circuit and power decoupling circuit are independent of each other,which is conducive to the transformation of traditional equipment.Finally,a simulation model and experimental prototype were built.It is verified in the simulation and experimental results that the converter can effectively absorb the pulsating power with thin film capacitors of dozens of microfarads when four-switch power decoupling circuit operates.

关 键 词：二倍频功率脉动 四开关功率解耦电路 两级式单相逆变器 脉冲能量调制 独立解耦 薄膜电容 

分 类 号：TM464[电气工程—电器]