采用分布系数和相角匹配分析的电磁环网潮流监控形式

针对切机措施下电磁环网的潮流控制形式和主要监控支路的识别问题,提出了一种采用分布系数和相角匹配分析的电磁环网潮流监控形式。该监控形式以常规分布系数法为基础,通过发电转移因子来消除被切机组出力对电磁环网潮流监控的影响;根据直流潮流的观点,利用高电压等级线路和低电压等级线路的电压相角匹配程度来识别主要监控线路。对南方某省500 k V/220 k V电磁环网的实例分析结果表明:所提方法能确保电磁环网高电压等级线路断开,并采取安全措施切除机组后,低电压等级线路不过载,从而在确保系统安全的前提下充分发挥电磁环网的输送能力。同时,所提方法不需要大量计算,仅依靠相角匹配分析就能准确识别出电磁环网的主要监控线路,有效减轻了调度监控的工作量,具有较高的安全预警性能。

Power flow control of electromagnetic loop network based on distribution coefficient and phase angle matching analysis

Aiming at the power flow control and identification of the main monitoring branch, which are the key problems of electromagnetic loop network by generator tripping measure, a power flow control form based on distribution coefficient and phase angle matching analysis is presented. This control form is based on the conventional distribution coefficient method, eliminates the influence on power flow control caused by the generator tripping through generation shift distribution factors, and according to the DC power flow, identifies the key monitoring line by the matching degree of voltage phase angle of lines with high voltage and low voltage. Example analysis results against the 500/220 kV electromagnetic loop network in the southern province show that the proposed method can avoid overload operation on the low voltage line after the high voltage line of the electromagnetic loop network is disconnected and security measures are taken to remove the unit, thus the transmission capacity of the electromagnetic loop network can be fully enhanced under the premise of system security; moreover, the proposed method does not need too much calculation, only through the phase matching analysis, the main monitoring line of the electromagnetic loop network can be identified accurately. So, the presented way effectively alleviates the workload of scheduling monitoring and has high performance on the safety precaution.