一种SVG新型解耦控制方法

A New Decoupling Control Method for SVG

首先,对于三相三线制静止无功发生器(SVG)进行数学建模,然后,针对模型中传统的双序解耦控制在不平衡负载下精度和响应速度等方面不足,提出一种新型的双序解耦控制方法。新型解耦控制中,直接用指令电流代替SVG直轴和交轴电流参与解耦控制,消除了电流误差Δi·ωL,使SVG输出电流更接近负载电流,减少了系统误差,提高了电网电流波形质量。最后,为了验证理论的可行性,在MATLAB平台搭建模型,并分别对感性和容性不平衡负载分别进行系统仿真。在两种负载下,分别对比了传统解耦方法和新型解耦控制方法对于响应速度和波形质量的影响,通过仿真结果对比分析,展示了新型解耦控制方法在加快响应速度和改善波形质量方面的优势,验证了SVG新型解耦控制方法的有效性。

Firstly, the mathematical model of three-phase three wire static var generator(SVG) was established. Then, aiming at the shortcomings of traditional double sequence decoupling control in accuracy and response speed under unbalanced load, a new double sequence decoupling control method was proposed. In the new decoupling control, the command current was directly used to replace the direct axis and quadrature axis currents of SVG to participate in the decoupling control, which eliminated the current error, made the SVG output current closer to the load current, reduced the system error and improved the quality of power grid current waveform. Finally, in order to verify the feasibility of the theory, the model was built on the MATLAB platform, and the inductive and capacitive unbalanced loads were simulated respectively. Under the two loads, the effects of the traditional decoupling method and the new decoupling control method on the decoupling response speed and waveform quality were compared respectively. Through the comparative analysis of the simulation results, the advantages of the new decoupling control method in accelerating the response speed and improving the waveform quality were shown, and the effectiveness of the new decoupling control method of SVG was verified.