互联系统低频减载方案探讨

在大型互联系统中 ,只有相当严重的功率缺额才可能导致频率下降 ,频率的下降速度很快 ,频率变化的分布极不均匀。目前的低频减载 (UFLS)装置已不能适应如此复杂的情况 ,仍然是在全系统范围内切除预接负荷。文中设计一种新的减负荷方案 ,它利用频率和电压的变化 ,针对每一种事故情况 ,特别是在承受较大扰动地区切负荷 ,以求获得供需平衡。在互联系统的严重功率缺额的模拟研究表明了新的减负荷方案比现在的低频减载 (UFLS)方案有着明显的优越性

A new load shedding scheme for limiting underfrequency

In large interconnected power systems, serious frequency falls now require a very heavy loss of generation and should such event occur, the rate of frequency decline would be greater than that had been developed. Obviously the character of the power systems have changed and yet no corresponding modification of ULFS has been made and there is still shedding of pre-selected loads throughout the entire power system. This paper proposes a new scheme utilizing frequency and voltage changes to shed loads specifically in the most affected localities while regaining the load -generation balance for each incident. Simulation studies on an extensive interconnected network, following very severe loss of generation, show the advantage of the proposed scheme to the actions of existing ULFS.