Abstract The high electrical stresses in the Electrical Insulation Systems of machines fed by pulse width modulation (PWM) inverters remain a limitation of the lifetime. The stress is caused by repetitive over voltages caused by the short switching times of the PWM inverter power electronic circuit. This paper provides measurements made on an industrial drive connected to the grid with standard cables that include a ground connection wire, following the current standards. The phase-to-phase, phase-to-neutral, and neutral-to-ground voltages are measured focusing on short and repetitive voltage spikes. The causes of these voltage spikes are analyzed using a high frequency equivalent circuit of the whole drive, including the earthing system. The simulations are made with the well-known SPICE circuit simulator. This study focuses on the common-mode currents flowing in the earthing connections and its influence on voltage spikes. A solution that can reduce significantly the phase-to-neutral voltage spikes is proposed.

中文翻译：

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PWM 驱动器的接地连接对电机绝缘承受的电压限制的影响

摘要 由脉宽调制 (PWM) 逆变器供电的机器的电绝缘系统中的高电应力仍然是使用寿命的限制。该应力是由 PWM 逆变器电力电子电路的短开关时间引起的重复过电压引起的。本文提供了对使用标准电缆连接到电网的工业驱动器进行的测量，该电缆包括接地线，遵循当前标准。测量相间电压、相间电压和中性线对地电压，重点关注短时和重复性电压尖峰。使用整个驱动器（包括接地系统）的高频等效电路来分析这些电压尖峰的原因。仿真是使用著名的 SPICE 电路仿真器进行的。本研究侧重于接地连接中流动的共模电流及其对电压尖峰的影响。提出了一种可以显着降低相电压尖峰的解决方案。