具有鲁棒特性的虚拟同步发电机无功电压环节参数设计
Parameter Design of Reactive Power-Voltage Loop for Robust Virtual Synchronous Generator
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摘要: 虚拟同步发电机(VSG)是近年来并网逆变器控制策略研究中的热点,但关于其无功电压环节参数设计的研究目前并不多见。首先,以具有鲁棒特性的VSG为例,建立端电压设定值与其输出电压和无功功率之间的小信号模型。然后,利用增益对比分析实现无功电压环节和有功环节的解耦,得到了2阶形式的VSG无功电压环节数学模型,并借鉴IEEE和IEC推荐的同步发电机励磁系统参数设计依据,实现VSG无功电压环节参数的设计。最后,利用仿真和实验验证了所提方法的正确性与有效性。Abstract: Virtual synchronous generator（VSG）is a hotspot in the control strategy research of grid-connected inverters in recent years,but the research on the parameter design of VSG reactive power-voltage loop is rare.Firstly,taking robust VSG as an example,small signal model between reference voltage,and the output of reactive power and reactive voltage is established.Then the decoupling between reactive power-voltage loop and active power loop is realized through gain comparison analysis,and a second-order mathematical model of the output of reactive power-voltage of VSG is obtained.Referring to design requirements of excitation system parameters of synchronous generator recommended by IEEE and IEC,the parameters of VSG reactive power-voltage loop are designed.Finally,simulation and experiment results verify the effectiveness of the proposed method.
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