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从同步旋转坐标系下电压型逆变器数学模型出发,导出了有源电力滤波器(APF)系统的能量-功率数学模型,运用非线性系统的全局线性化方法,提出了APF的直流电容电压的非线性控制方法,采用该方法可以在设定时间内使逆变器的直流侧电容电压进入稳定状态。该方法既避免了通用的比例-积分控制器控制参数难以设定的问题,又可以改善APF的动态和静态补偿性能, 使被控系统无论在大、小扰动下都可具有良好的速动性和稳定性。仿真结果验证了新方法的可行性和可靠性。该研究是基于双极性电压型逆变器作为补偿装置的有源滤波器系统,相应的思路可用于类似的应用场合。
Starting from the mathematical model of voltage-source inverter in synchronous rotating coordinate system, the energy-power mathematical model of active power filter (APF) system was derived. By using the global linearization method of nonlinear system, the DC capacitor voltage Nonlinear control method, the method can be set within the inverter DC voltage side of the capacitor into a stable state. The proposed method not only avoids the problem that the control parameters of common proportional-integral controller are difficult to set, but also improves the dynamic and static compensation performance of the APF so that the controlled system can have good speediness no matter under large or small disturbance And stability. Simulation results verify the feasibility and reliability of the new method. This study is based on a bipolar voltage-source inverter as an active filter system for compensating devices. Corresponding ideas can be used for similar applications.