惰转并网调相机同期系统定值整定及调整方法

doi:10.11930/j.issn.1004-9649.202212038

摘要/Abstract

摘要： 调相机在惰转工况下并网，其同期系统定值难以兼顾并网成功率和冲击的要求。分析了调相机的惰转特性，给出了频率变化率的特征表达式和实测方法；研究了调相机电压相对于电网电压的变化特性，总结了同期点出现的规律。规律研究表明，频率差定值满足后调相机电压相量相对于电网电压相量至少应旋转360°的角度，以此为基础推导了频率差定值计算公式。考虑整定频差下同期并网的工况，推导了同期检查继电器相角差定值计算公式。利用同源核相试验完成电压采样通道的标定并测量断路器合闸时间；通过假同期试验完成调相机频率变化率的测量和导前时间的调整。所提方法能满足100%并网概率要求，且可最大限度减小差频并网给调相机带来的冲击，工程现场试验结果证明了所提方法的可行性和合理性。

关键词: 调相机, 惰转, 同期系统, 定值整定, 参数调整

Abstract: When connecting the idling condenser to the grid, it is difficult to configure the setting value of the synchronization system to balance the requirements of grid connection success rate and current shock together. In this paper the idling characteristic of the condenser is analyzed, and then the characteristic expression and measurement method of frequency change rate are put forward. Based on the study of the variation characteristics of the voltage of the condenser with respect to the voltage of the power grid, the patterns of the occurrence of the synchronization points are summarized first. It appears that once the frequency differential setting is met, the voltage vector of the condenser should rotate at least 360° with respect to the grid voltage vector. Then the calculation formula for the frequency differential setting is derived. Considering the working condition of synchronization under the frequency differential setting, the formula is also derived for calculating the phase angle differential setting value of synchronous detection relay. The voltage sampling channel is calibrated and the closing time of the circuit breaker is measured by phase verification test with the same source. The measurement of the frequency change rate of the condenser and the adjustment of the lead time are performed by false synchronization test. This method can meet the requirement of 100% grid connection probability while minimizing the shock impact of differential frequency grid connection on the condenser. The feasibility and rationality of this method are verified from the field test results.

Key words: condenser, idling, synchronous system, value settings, parameter adjustment

石吉银, 施晟, 王达, 卢万华, 林小园. 惰转并网调相机同期系统定值整定及调整方法[J]. 中国电力, 2023, 56(7): 117-124.

SHI Jiyin, SHI Sheng, WANG Da, LU Wanhua, LIN Xiaoyuan. Setting Configuration and Adjustment Method of Synchronous Condenser System Under Idling Conditions[J]. Electric Power, 2023, 56(7): 117-124.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202212038

https://www.electricpower.com.cn/CN/Y2023/V56/I7/117

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