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中文摘要：
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。
英文摘要：
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.
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