丁德胜

[摘    要]某海上平台油气外输系统中压电机驱动系统选用了施耐德公司生产的中压变频调速驱动。中压变频器从2015年投运后基本没有发生过重故障事件，但从2019年底开始陆续出现重故障停机事件，导致平台混输泵关停，从而导致油田生产关停，严重影响了油田的正常安全生产。文章对中压变频器系统的结构、工作原理、重故障原因分析及预防措施等进行了介绍，提出了通过定期维护降低中压变频器的故障率，以提高油田油气外输系统的稳定性，保证油田的正常生产。

[关键词]油气混输;中压变频器;重故障;预防

[中图分类号]TM921.51 [文献标志码]A [文章编号]2095–6487（2021）07–0–03

Cause Analysis and Prevention of Heavy Failure of Medium Voltage Inverter on Offshore Platform

Ding De-sheng

[Abstract]The medium voltage motor drive system of an offshore platform oil and gas transportation system uses the medium voltage variable frequency drive produced by Schneider. Since the medium voltage inverter was put into operation in 2015， there has been basically no serious fault incident， but since the end of 2019， serious fault shutdown incidents have occurred successively， which caused the shutdown of the platform mixing pump， which led to the shutdown of oilfield production and seriously affected the normal operation of the oilfield. Safe Production. The basic structure， principle， cause analysis and preventive measures of major faults of the medium voltage inverter system are introduced. Regular maintenance reduces the failure rate of the medium voltage inverter， improves the stability of the oil field oil and gas transmission system， and ensures the normal production of the oil field.

[Keywords]oil-gas mixed transportation; medium voltage frequency converter; serious fault; prevention

1 ATV1200系列中压变频调速系统的结构及工作原理

1.1 变频调速器系统的结构

ATV1200系列中压变频调速系统采用功率单元串联技术解决器件耐压问题，多级串联PWM信号移相后叠加，减少了输出侧谐波、降低输出电压的dV/dT;通过电流多重化技术减少对电网反馈的谐波，减小对电网的谐波污染;主控制器采用数字信号处理器、可编程门阵列为核心，配合数据采集单元、单元控制器和光纤通信回路以及可编程逻辑控制器（PLC）构成控制系统。

ATV1200系列中压变频调速系统分成必选组件及可选组件。必选组件如图1所示。标准配置组件如下。

（1）变压器柜。装有移相整流变压器，为各个功率单元提供交流输入电压。

（2）功率柜。装有模块化设计的多个功率单元级联式的逆变主回路，向电机提供逆变后的可调电压。

（3）控制柜。……