一种高压变频器电网电压故障控制方法及其在天然气长输管线中的应用

A control method for grid voltage fault of high voltage inverter and its application in long distance gas pipeline

针对单元串联型高压变频器,本文提出一种应对电网电压短时跌落甚至中断等故障的控制方法。该控制方法可以避免高压变频器在电网电压短时跌落甚至中断时报输出过电流和单元欠电压等故障,并且在电网电压恢复时可以自动恢复至电网故障前状态。最后介绍了该控制方法在天然气长输管线电驱压气站中的应用情况。

In this paper,a control method is proposed for high voltage inverter with cascaded cell topology to deal with short-time drop or even interruption of grid voltage.The control method can avoid the output over-current and power cell under-voltage faults when grid voltage drops or even interrupts for a short time,and can automatically recover to the normal state when grid voltage recovers.Finally,the application of the control method in the compressor station of long distance gas pipeline is introduced.