Setting Configuration and Adjustment Method of Synchronous Condenser System Under Idling Conditions

doi:10.11930/j.issn.1004-9649.202212038

Abstract

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

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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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202212038

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

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