| 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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| 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： |
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| 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） |
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| Resonant characteristics of multi-inverter grid-connection system |
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HU Wei, MA Qian, ZHA Xiaoming
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School of Electrical Engineering，Wuhan University，Wuhan 430072，China
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| 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 |
