电压电流双闭环控制逆变器并联系统的建模和环流特性分析  

Modeling and Circulating-Current Characteristics Analysis of Voltage and Current Double Closed-Loop Controlled Inverter Paralleling System

作　　者：肖岚[1] 李睿[2] 

机构地区：[1]南京航空航天大学自动化学院,南京210016 [2]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2006年第2期51-56,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50337030);航空科学基金资助项目(01F52032)

摘　　要：传统的基于功率差的逆变器并联控制方法是由电力系统中同步电机并网理论演变而来,通过分别改变各并联模块输出电压的幅值和相位来分别控制各模块输出无功和有功功率平衡,但该并联均流方案应用于电压电流双闭环反馈控制逆变器并联系统时有较大的控制误差。本文建立了考虑环流因素的电压电流双环控制逆变器闭环系统电路模型,依据传递函数推导出并联系统有功环流和无功环流与输出电压幅值和相位的关系。建立基于等效输出阻抗和求解微分方程的环流特性分析方法,给出了逆变器输出有功环流和无功环流与输出电压幅值和相位之间的定量关系,提出了相应的并联均流控制方案。仿真结果证实有功和无功环流均受输出电压幅值和相位影响,实验结果证明所提控制方案有较好的均流效果。Traditional power difference based paralleling control technology of inverters is evolved from the grid-connection theory of the synchronous generators in utility system, in which the sharing of the active and reactive power in each module is controlled and balanced by adjusting the phase and amplitude of the output voltage respectively. When used in paralleling inverters which adopt voltage and current double closed-loop control strategy, this method however, results in relatively large control error. This paper establishes the circuit model of the voltage and current double closed-loop controlled inverter with the consideration of the circulating-current. The active and reactive power＇s relationship with the amplitude and phase of the output voltage is deduced from the transfer function. The circulating-current characteristic analysis method is established based on equivalent output impedance model and differential equations calculation. The quantitative relationship between the output power and the output voltage is given, and the corresponding paralleling control technology is proposed. The simulation result verifies that both the active and reactive power are affected by the amplitude and the phase of the output voltage. Experimental results verify that the proposed control scheme has good load-sharing effect.

关 键 词：并联 逆变器 环流 输出阻抗 建模 

分 类 号：TM464[电气工程—电器]