并联逆变器输出阻抗分析及电压控制策略

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摘要在分析低电压微电网中并联逆变器的基础上,通过引入虚拟复阻抗,提出了一种基于虚拟复阻抗的电压控制策略,使逆变器输出阻抗在工频条件下呈纯阻性,进而改善多逆变器并联均流控制效果。通过对比分析输出阻抗的幅频特性,深入探讨了不同控制参数对逆变器输出阻抗的影响,并选取了合适的控制参数,给出了相应的下垂控制方法。最后,搭建了仿真模型和实验平台。仿真和实验结果验证了所提的控制策略的正确性和有效性。

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	张庆海
	罗安
	陈燕东
	彭楚武
	彭自强

关键词 ：并联逆变器, 输出阻抗, 虚拟复阻抗, 电压控制, 低电压微电网

Abstract：Based on the analysis of parallel-connected inverters in low-voltage microgrid, a voltage controller based on virtual complex impedance is developed by introducing virtual complex impedance, so that the output impedance of inverters can be resistive under the conditions of mains frequency and it can improve the performance of parallel multiple-inverters. The effects of different control parameters on the output impedance are discussed through the amplitude-frequency characteristic analysis of output impedance, and appropriate control parameters are selected and the corresponding droop control method is given. Finally, the simulation model and experimental platform are built. Simulation and experiment results verify that the proposed method is correct and effective.

Key words： Parallel inverters output impedance virtual complex impedance voltage control low-voltage microgrid

收稿日期: 2012-05-04 出版日期: 2014-11-05

PACS:

TM464

基金资助:国家自然科学基金重点项目（51237003）,国家重点基础研究发展计划（973计划）（2009CB219706）和中国与欧洲政府间国际合作计划（2010DFA61640）资助项目

作者简介: 张庆海男,1988年生,硕士研究生,研究方向为分布式发电技术、微电网运行与控制等。罗安男,1957年生,教授,博士生导师,研究方向为电能质量控制和微电网控制等。

引用本文:

张庆海, 罗安, 陈燕东, 彭楚武, 彭自强. 并联逆变器输出阻抗分析及电压控制策略[J]. 电工技术学报, 2014, 29(6): 98-105. Zhang Qinghai , Luo An , Chen Yandong , Peng Chuwu , Peng Ziqiang. Analysis of Output Impedance for Parallel Inverters and Voltage Control Strategy. Transactions of China Electrotechnical Society, 2014, 29(6): 98-105.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I6/98

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