柔性电负荷平衡装置对孤岛电网调频过程的影响研究

孤岛电网是一种容量较小、频率和电压稳定度较差的特殊电网。文中针对此类电网运行情况,利用基于晶闸管的柔性电负荷平衡装置,建立一种考虑负荷端与发电机端协同出力的调频模型。采用ETAP仿真平台对苏拉威西某工业园电力系统使用不同调频模型的效果进行了仿真对比分析,结果表明:当系统突甩大负荷时,相对发电机单独调频模型,负荷端与发电机端协同出力的调频模型可使得系统频率波动更小,稳定频率更接近额定频率;当系统将接入大负荷时,提前投入电负荷平衡装置可以避免系统频率断崖式下跌,将频率下跌过程进行拆分,缓解系统内设备的压力。

The frequency modulation model considering the coordinated output of the load end and the generator end

Aiming at the special grid operation situation of the isolated power grid, the electric load balancing device is used to establish a frequency modulation model considering the coordinated output of the load side and the generator side. The ETAP simulation platform is used to simulate and analyze the power system of an industrial park in Sulawesi. It is found that when the system suddenly throws a large load, compared to the generator''s independent frequency modulation model, the frequency modulation model of the load end and the generator end can make the system frequency fluctuation smaller and the stable frequency closer to the rated frequency. When the system is connected to a large load, putting in the electric load balancing device in advance can prevent the system frequency from falling off a cliff, and split the frequency falling process to relieve the pressure on the equipment in the system.