基于电荷平衡的两级式逆变器前级电路控制方法

发布时间：2018-03-28 08:27

本文选题：单相逆变器　切入点：前级电路　出处：《电工电能新技术》2017年12期

【摘要】：针对两级式逆变器传统控制中无法兼顾抑制二次纹波电流i2nd和改善中间母线电压ub动态特性的问题,提出了一种基于电荷平衡控制和传统控制相组合的方法,前者负责改善动态下ub的控制,后者负责稳态下抑制二次纹波电流i2nd的控制。分析了前级电路双环控制中符合i2nd需求下电压环的设计方法、Δub对穿越频率ωc范围的影响,以及最终对ub动态响应时间ts的影响。推导了电荷平衡控制的原理,占空比的获取,提出了一些设计关键问题的解决办法。最后在一台100V输入、200V中间母线电压、110V输出、450W负载的样机上进行了测试,比较了传统方法和所提控制方法在投载下的动态特性,显示所提方法具有响应快,波动小的优点,证明了方法的有效性。
[Abstract]:Aiming at the problem that the traditional control of two-stage inverter can not take into account the problem of suppressing the secondary ripple current i2nd and improving the dynamic characteristics of the intermediate bus voltage ub, a method based on charge balance control and traditional control is proposed. The former is responsible for improving the control of ub in dynamic state, while the latter is responsible for the control of suppressing the secondary ripple current i2nd in steady state. The design method of voltage loop in the double loop control of the front stage circuit is analyzed, and the influence of 螖 UB on the cross frequency 蠅 c range is analyzed. Finally, the influence on ub dynamic response time ts is derived. The principle of charge balance control and the acquisition of duty cycle are deduced. Some solutions to the key design problems are proposed. Finally, the dynamic characteristics of the traditional method and the proposed control method are compared with those of a 100V input 200V intermediate bus voltage output voltage of 110V and 450W load. It shows that the proposed method has the advantages of fast response and low fluctuation, and proves the effectiveness of the proposed method.
【作者单位】：华东交通大学电气学院;
【基金】：国家自然科学基金项目(51467005) 江西省重点研发计划项目(20171BBE50018)
【分类号】：TM464

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