晶闸管电子负荷在孤网频率振荡抑制中的应用

在电力系统运行过程中,出现大型负荷突然丢失而发电机调节能力不足时,系统频率升高,频率和功率发生振荡,甚至会导致系统崩溃。在只有数台发电机的孤岛供电系统中,发电机调节能力有限,常规负荷需要担任生产任务,并不能参与调频,故孤网系统缺乏有效的调频手段。文中提出一种基于晶闸管控制的电子负荷装置,对其工作原理、孤网频率振荡抑制机理和控制策略进行分析,基于实时数字仿真系统(RTDS)研究不同参数下电子负荷装置在频率振荡抑制方面的效果。研究表明,采用电子负荷装置可以通过负荷动态控制参与一次调频,为孤网频率振荡抑制提供了新的思路。

Application of thyristor electronic load in the suppression of isolated grid frequency oscillation

During the operation of the power system, when a large load is suddenly lost and exceeds its adjust capability, the frequency will increase, and the frequency and power will oscillate and even case a black network event. In the isolation grid power system with only a few generators, the regulation capacity of the generators is limited, and the conventional load needs to serve as production tasks and cannot participate in frequency control. The isolation grid system lacks an effective frequency control method. This paper proposes an electronic load device based on thyristor control, analyzes the working principle of the device and the mechanism that can be applied to the suppression of the isolation grid frequency oscillation, introduces its working control strategy, and researches the effect of the different parameter of the electronic load device based on the RTDS real-time simulation system. The studies show that the electronic load devices can participate in primary frequency control by means of the load dynamic control, which providing a new control method for the suppression of frequency oscillation of the isolated network.