基于负序分量的分布集中式广域后备保护研究

A centralized-distributed wide area backup protection study based on negative sequence component

提出了一种基于负序分量的分布集中式广域后备保护方法。文章利用系统故障时线路负序电压的分布特点,通过对各母线负序电压的排序,确定由疑似故障母线和线路组成的疑似故障区,并采用分层搜索方法,首先对准疑似故障母线及线路关联IED处对应的负序功率方向进行判别,直至判定并切除故障母线或线路。该方法仅需将定义的准疑似故障区域的信息上传至决策中心,系统计算量和通信量大为减少,从而加快了故障元件的识别速度。算例仿真结果表明,该方法在高阻接地、潮流转移过负荷及转换性故障运行情况下均能良好动作,验证了此方法的有效性以及适用性。

A centralized-distributed wide area backup protection is presented on negative sequence component. This paper determines the likely faulty area composed of likely faulty buses and lines by sorting the negative sequence volt- age of buses, based on the distribution characteristic of negative sequence voltage. A hierarchical searching algorithm is applied in this paper. It firstly estimates the direction of negative sequence flow of the IED concerned with strongly suspected faulty buses and lines, until the faulty buses or lines are removed. This algorithm uploads only the message of strongly suspected faulty area to the decision center, which reduces the calculated quantity and communication traf- fic and Speeds up faulty elements identification. Simulation test illustrates the effectiveness and the adaptability when grounding resistance and flow transferring and cross-country fault happens.