变频器功率单元电磁兼容性改进

针对多电平单元串联电压源型高压变频器的功率单元处于多电平，高电磁的工作环境，其中的电磁骚扰严重威胁装置的稳定运行。通过提高功率单元的EMC性能，增加装置运行的稳定性。通过六次对功率单元的电磁兼容性能的测试，并根据问题对功率单元进行五次改进。将功率单元在通过电快速瞬变脉冲群性能从2．0kV，24s等级提高到3．0kV，300s等级。在功率单元更改完毕后，在整机上进行连续运行测试，原功率单元在整机连续运行测试经常误报故障的缺陷消除。

The Power Unit Electromagnetic Compatibility Technically Investigation for Frequency Inverter Equipment

Aim at The frequency inverter equipment of voltage source of cell mid series of multi-level voltage of power cell on the many mid voltage and high electromagnetic environment ,with electromagnetic disturbance is severity imperil equip ment by run tranquilization. Pass improver the power unitl EMI function, equipment circulate more stabilization.Pass six degree Electromagnetic compatibility tests by the power cell, basis of problem to the power cell being five degree alteration. The power cell electrical fast transient burst of function form 2kV, 24s grade up to 3kV, 300s grade.Achieve improve the power cell, being hour after hour function test by holistic equipment, it eliminate regular wrong appear malfunction in time holistic equipment hour after hour function primary the power cell.