单位功率因数三相PWM变流器的相量调节方法

本文提出一种基于幅相控制方式单位功率因数三相电压型PWM变流器的相量调节方法。根据相量间的直角三角形关系和能量转换平衡原则，建立了该系统的低频数学模型，分析了系统的相量调节方式。在此基础上，提出一种电流前馈的调节方式，即将直流侧负载电压的变化率转化为到达下一个平衡状态时相位与调制深度的附加控制量，以提高系统的快速性。实验证明：控制系统实现了单位功率因数和能量的双向流动，且输出直流电压恒定可调，相电流的谐波含量非常小，系统动态性能较好。

A Phasor Adjusting Control Strategy for Unity Power Factor Three-phase PWM Converter

This paper presents a phasor adjusting control strategy for a unity power factor three-phase PWM type converter based on phase and amplitude control (PAC). With right-angle triangle relation between phasors and principle of conversation of energy, a phasor adjusting method and the relevant low-frequency math model of the system are analyzed in details, both converting and inverting operating mode of the converter are discussed. For improving the traditional PAC dynamic performance, variable load current is detected indirectly by the change of the DC voltage, which feed to the control system as a additional control variable to generate modulation index and phase angle. Experimental results from a 3kw laboratory device are included to demonstrate the effectiveness of the proposed control strategy.