单元级联多电平高压变频器接地保护之探讨

电动机的单相接地是电动机较常见故障,由于高压变频器输出电压中的高次谐波分量大,电机绕组单相接地后容易导致绝缘损坏,故高压变频器必须配备单相接地保护.不同原理的变频器,接地保护构成及原理各不相同,以单元串联多电平电压型高压变频器的接地保护为例对高压变频器接地保护进行分析、探讨,通过现场试验测试,得到相应接地特征波形,并对接地保护构成及定值整定提出相应观点.

Series Multi-level Unit High Voltage Converter on the Protection of Grounding

Motor-phase-to-ground is a common fault.High voltage converter output voltage with the high harmonic components,motor winding single-phase ground will easily be damaged insulation,so the high voltage converter must be equipped with single-phase-to-ground protection.Different principle of frequency converters,the grounding protection and the principle are not the same.A modular multi-level series of high voltage converter voltage protection was taken as an example of the grounding of the high-voltage convert...