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提出了一种基于优化电压矢量的有源滤波器定频滞环电流控制新方法。该方法用一组滞环比较器判定参考电压矢量所在区域 ,并据此选择适当的两相开关独立地用定频滞环控制技术控制相应的相间电流 ,以实现良好的电流跟踪。这一方法的主要特点是无需估计系统阻抗参数即可用优化电压矢量实现定频滞环控制 ,因此既具有较高的直流电压利用率和较高的控制精度 ,又保持了稳定的开关频率 ,从而有效地提高了有源滤波器的综合性能。计算机仿真结果表明了本方法的有效性。
A new method of fixed frequency hysteresis current control of active filter based on optimized voltage vector is proposed. In this method, a set of hysteresis loop comparator is used to determine the region where the reference voltage vector is located. Based on this, an appropriate two-phase switch can be used to control the corresponding phase currents separately by using the fixed-frequency hysteresis control technique to achieve good current tracking. The main feature of this method is that it can realize the fixed frequency hysteresis control with the optimized voltage vector without estimating the system impedance parameters. Therefore, it has high DC voltage utilization and high control precision while maintaining a stable switching frequency Effectively improve the overall performance of the active filter. Computer simulation results show the effectiveness of this method.