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更新时间:2026.04.18
三相软开关PWM变流器电流极性检测与电流补偿方法(英文)

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A novel software implementation for current polarity detection and current compensation is presented. For a three-phase zero-voltage soft-switching (ZVS) PWM converter based on phase and amplitude control (PAC), when saw-tooth carriers with alternate positive and negative slopes are adopted, the positive or negative slopes are chosen according to the phase current polarity. Since po-larity reversal causes current distortion, current at the instant of reversal should be compensated for. Based on the characteristic of unity power factor converter in rectification and regeneration modes, a software implementation for current polarity detection is proposed. Distortion of current zero-crossing caused by using saw-tooth carriers with alternate positive and negative slopes is analyzed, and the relevant compensation method is proposed. Experimental study with a 1.5 kW device shows that phase current has a small harmonic content and power factor is high both in rectification and regeneration modes.

一种三相软开关PWM变流器电流极性检测与电流补偿方法

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大小:218KB

页数: 5页

对于一种基于幅相控制的三相零电压开关PWM变流器,在利用正负斜率交替的锯齿载波调制方式下,需要按照电流极性来进行锯齿载波斜率的交替翻转,由于在翻转处会造成电流畸变,也需要按照电流极性变化的时刻来补偿。该文从单位功率因数变流器的固有特点出发,在顺变和逆变状态下,提出了电流极性检测的软件实现方法,分析了使用正负斜率锯齿载波带来的电流过零点失真的原因,并给出了相应的补偿方案。该方法有效保证了软开关技术在三相PWM变流器上的实现,具有简便有效、节约硬件资源、相电流谐波较小等优点。

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