引用本文:胡 伟,马 谦,查晓明.多逆变器并网系统谐振特性分析[J].电力自动化设备,2014,34(7):
HU Wei,MA Qian,ZHA Xiaoming.Resonant characteristics of multi-inverter grid-connection system[J].Electric Power Automation Equipment,2014,34(7):
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多逆变器并网系统谐振特性分析
胡 伟, 马 谦, 查晓明
武汉大学 电气工程学院,湖北 武汉 430072
摘要:
基于闭环传递函数法建立了LCL并网逆变器诺顿等效模型,利用所建立的模型分析了并联逆变器数量、组成和系统控制参数对系统谐振特性的影响。分析结果表明:和传统单逆变器系统相比,多逆变器并网系统存在多个谐振频率,谐振频率个数和系统中的逆变器种类相关,较低的谐振频率随着逆变器数量的增加而减小,随着并网阻抗的增大而减小;谐振频率随着电容电流内环参数的增大而减小,随着并网电流外环控制参数KP的增大而增大,基本不受并网电流外环控制参数KI的影响。仿真分析结果证明了理论分析的正确性。
关键词:  分布式发电  LCL滤波器  并网  逆变器  谐振  模型
DOI:
分类号:
基金项目:国家自然科学基金重大资助项目(51190102);国家自然科学基金资助项目(51277137,51177113)
Resonant characteristics of multi-inverter grid-connection system
HU Wei, MA Qian, ZHA Xiaoming
School of Electrical Engineering,Wuhan University,Wuhan 430072,China
Abstract:
A Norton equivalent model of grid-connected inverter with LCL filter is established based on the close-loop transfer function method,based on which,the influences of the number and type of grid-connected inverters and the system control parameters on the resonant characteristics of system are analyzed. Results show that,the multi-inverter grid-connection system,compared to the traditional single-inverter system,has more resonant frequencies;its number is related to the inverter type and the lower resonant frequencies decrease along with the increase of the number and decrease along with the increase of grid-connecting impedance;the resonant frequency decreases along with the increase of capacitive current inner-loop parameters and increases along with the increase of grid-connecting current outer-loop control parameter KP,and is immune to its control parameter KI. Simulative results verify the validity of theoretical analysis.
Key words:  distributed power generation  LCL filter  grid connection  electric inverters  resonant  models

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