孤岛微网中虚拟同步发电机不平衡电压控制

发布时间：2018-07-14 11:16

【摘要】：在孤岛微网中,逆变器采用虚拟同步发电机(virtual synchronous generator,VSG)控制后,有利于提升微网的电压和频率稳定;但现有的VSG控制策略,带不平衡负荷的能力差,降低了供电电压品质。建立了VSG的数学模型,分析了输出电压不平衡的产生机理和抑制措施。基于正序和负序网络阻抗的独立解耦控制,提出一种抑制负序电压的控制方法。采用复系数滤波器快速检测负序电流,利用复系数比例积分控制器实现电压跟踪。研究了滤波器和控制器关键参数的设计方法,实现VSG对正序和负序输出电压的独立控制,便于其正序和负序阻抗的定制化控制。通过对一台VSG样机进行实验,验证了所提控制策略的正确性和有效性,为VSG的运行控制提供了一种新思路。
[Abstract]:In islanding microgrid, the voltage and frequency stability of the microgrid can be improved by using virtual synchronous generator (VSG) control, but the current control strategy with unbalanced load has a poor ability to reduce the quality of power supply voltage. The mathematical model of VSG is established, and the mechanism of output voltage imbalance and its restraining measures are analyzed. Based on the independent decoupling control of the impedance of the positive sequence and negative sequence networks, a control method to suppress the negative sequence voltage is proposed. The complex coefficient filter is used to detect the negative sequence current and the complex coefficient proportional integral controller is used to track the voltage. The design method of the key parameters of the filter and controller is studied to realize the independent control of the positive sequence and the negative sequence output voltage by VSG, which is convenient for the customization control of the positive sequence and the negative sequence impedance. The correctness and effectiveness of the proposed control strategy are verified by experiments on a VSG prototype, which provides a new idea for the operation control of VSG.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);国网山东省电力公司泰安供电公司;
【分类号】：TM71

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