依某直流系统功率调制异常为例，结合现场相关事件记录和故障恢复前后时刻录波波形，分析推断引起此次功率调节异常原因是整流侧接收到对站电流参考值出现异常。详细分析了总的功率参考值、总的电流参考值、直流电流参考值、直流电流测量值之间数值计算关系，以及现场极控系统站间通信完成功能，分析定位造成整流侧电流参考值异常原因是换流站站间通信通道存在异常。仿照现场极控系统实际站间通信配置结构，设计仿真实验项目，在实验室搭建的仿真平台上完成现场故障重现，完成推论验证。最后，总结分析造成直流系统功率调制异常相关环节并指出对应处理措施，对今后功率调制相关故障快速处理具有实际指导意义。%According to an HVDC system power modulation abnormal case, this paper analyzes the power abnormal modulation reason that the rectifier station receives the abnormal current reference from the other station based on the related events and recorded waveform before and after fault recovery. From the detailed analysis of the relationship among the total power reference, the total current reference, the DC current reference, the measured DC current value, and the role of the pole control DUST between the two stations, the inference which causing the abnormal current reference is the abnormal communication channel of the pole control between the two stations. The simulation projects are designed and reappeared in the simulation platform built in the laboratory according to the actual structure of the inter-station communication configuration. At last, it summarizes the related links which cause abnormal power modulation and gives corresponding treatments, which has guiding significance for similar power modulation fast processing in the HVDC system.
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