柔性直流对柔直测量系统阶跃响应要求探讨
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摘要
鲁西背靠背换流站柔性直流单元整流侧交流系统发生了两相接地故障,造成阀差动保护动作。通过对阀差动保护动作过程进行分析,并探讨了柔性直流输电控制保护系统对柔直测量系统阶跃响应的影响和要求,得出阀差动保护动作的原因是差动保护的电子式电流互感器阶跃响应时间不满足要求。由于电流互感器一次设备特性无法改变,采取了调整保护参数设置的措施来解决问题,定值修改后柔性直流系统运行正常。最后针对柔直测量系统阶跃响应时间提出了相关建议。
A two-phase grounding fault happened at the rectifier side AC system of the VSC-HVDC unit in Lu-xi back-to-back converter station and caused the action of the valve differential protection. By the analysis of the action process of the valve differential protection and the discussion of influences and requirements of the VSC-HVDC transmission control and protection system on the step response of VSC-HVDC measurement system, it is found that the action reason of the valve differential protection is because the step response time of the electronic current transformer in the differential protection cannot satisfy the requirements. Adjustment of the protection parameter settings is adopted as a treatment to solve the problem, because the primary equipment characteristics of the current transformer cannot be changed. The VSC-HVDC system is in normal operation after the change of the settings. Finally, relevant suggestions on the step response time of the VSC-HVDC measurement system are proposed.
A two-phase grounding fault happened at the rectifier side AC system of the VSC-HVDC unit in Lu-xi back-to-back converter station and caused the action of the valve differential protection. By the analysis of the action process of the valve differential protection and the discussion of influences and requirements of the VSC-HVDC transmission control and protection system on the step response of VSC-HVDC measurement system, it is found that the action reason of the valve differential protection is because the step response time of the electronic current transformer in the differential protection cannot satisfy the requirements. Adjustment of the protection parameter settings is adopted as a treatment to solve the problem, because the primary equipment characteristics of the current transformer cannot be changed. The VSC-HVDC system is in normal operation after the change of the settings. Finally, relevant suggestions on the step response time of the VSC-HVDC measurement system are proposed.
引文
[1]荣信电力电子股份有限公司.云南电网与南网主网鲁西背靠背直流异步联网工程荣信柔直阀及阀控系统说明书[Z].荣信电力电子股份有限公司,2016.
[2]西安西电电力系统有限公司.云南电网与南网主网鲁西背靠背直流异步联网工程西电柔直阀及阀控系统说明书[Z].西安西电电力系统有限公司,2016.
[3] GB/T 20840.8—2007,互感器第8部分:电子式电流互感器.
[4] DL/T 278—2012,直流电子式电流互感器技术监督导则[S].
[5] ED3.640.RZ-0,云南电网与南网主网鲁西背靠背直流异步联网工程柔性直流直流电流测量装置设备规范[Z].
[6]斯尼汶特(上海)电气有限公司.云南电网与南网主网鲁西背靠背直流异步联网工程柔性直流电流测量装置例行试验报告[Z].斯尼汶特(上海)电气有限公司,2015.
[7]斯尼汶特(上海)电气有限公司.云南电网与南网主网鲁西背靠背直流异步联网工程柔性直流测量装置二次传输系统测试报告[Z].斯尼汶特(上海)电气有限公司,2015.
[8]罗苏南,王耀,丁晔,等.柔性直流输电用±500 kV直流全光纤电流互感器研制及测试[J].高压电器,2017,60(6):48-55.
[2]西安西电电力系统有限公司.云南电网与南网主网鲁西背靠背直流异步联网工程西电柔直阀及阀控系统说明书[Z].西安西电电力系统有限公司,2016.
[3] GB/T 20840.8—2007,互感器第8部分:电子式电流互感器.
[4] DL/T 278—2012,直流电子式电流互感器技术监督导则[S].
[5] ED3.640.RZ-0,云南电网与南网主网鲁西背靠背直流异步联网工程柔性直流直流电流测量装置设备规范[Z].
[6]斯尼汶特(上海)电气有限公司.云南电网与南网主网鲁西背靠背直流异步联网工程柔性直流电流测量装置例行试验报告[Z].斯尼汶特(上海)电气有限公司,2015.
[7]斯尼汶特(上海)电气有限公司.云南电网与南网主网鲁西背靠背直流异步联网工程柔性直流测量装置二次传输系统测试报告[Z].斯尼汶特(上海)电气有限公司,2015.
[8]罗苏南,王耀,丁晔,等.柔性直流输电用±500 kV直流全光纤电流互感器研制及测试[J].高压电器,2017,60(6):48-55.