摘要
水电群由于故障并网断路器跳闸后与主网裂解形成孤网时,孤网区域内负荷功率极低导致系统功率大量过剩,从而引起频率和电压的大幅变化。针对甘南孤网运行出现的问题,根据甘南电网实际运行情况制定出合理的切机方案从而抑制孤网高频,并通过投切电抗器和发电机进相运行来控制电压变化。利用PSASP对控制方案进行了仿真验证,结果表明,在合理的控制策略下甘南电网可以维持孤网运行时的稳定。
When an isolated grid is formed after separation between the tripped faulty grid-connection circuit breaker and the main grid in a hydropower group, the load power of the isolated grid area becomes so low that there is much excessive system power, thus causing sharp fluctuations of frequency and voltage. With respect to the operational problems in the Gannan isolated grid, under consideration of actual operational situation in that grid, a reasonable generator tripping scheme is formulated to suppress the high frequencies of the isolated grid. Furthermore, voltage fluctuations are controlled through tripping of the electric reactor and leading phase operation of the generator. PSASP is used to make a simulation verification of the control scheme, and the result shows that Gannan Grid can maintain a steady isolated grid operation by means of a reasonable control strategy.
出处
《电气自动化》
2015年第3期81-83,共3页
Electrical Automation
关键词
水电群孤网
频率
电压
进相运行
控制
稳定运行
isolated grid of hydropower group
frequency
voltage
leading phase operation
control
steady operation