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对引入系统电压前馈并采用P控制器的静止坐标系下三角波比较法的幅频特性和相频特性进行了详细的理论研究。首先用微分方程定量地推导出了该算法所带来的幅值差和相位差,然后用相量图推导出数字化实现时控制器的延时对算法所固有的幅值差和相位差的影响。在实际装置中,以上述理论为指导对三角波比较法进行了幅值和相位补偿。实验结果验证了文中理论分析的正确性。
The amplitude-frequency characteristics and phase-frequency characteristics of the triangular wave comparison method under the system voltage feedforward and P-controller are introduced in detail. First of all, the differential and phase difference brought by this algorithm are deduced quantitatively by using differential equation. And then the effect of controller delay on the amplitude difference and phase difference inherent in the algorithm is deduced from the phasor diagram . In the actual device, the amplitude and phase compensation of triangular wave comparison method is made under the guidance of the above theory. The experimental results verify the correctness of the theoretical analysis in this paper.