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在互联电力系统频率控制中,一般采用固定系数法设置频率偏差系数B,这会导致自动发电控制(AGC)调节量不能准确跟踪系统功率偏差,甚至可能引起严重的频率过调或欠调,进而引起频率稳定问题。在此背景下,基于电力系统中火电、水电通常设置不同的一次调频死区,提出了三段式B系数方法,能够更好地反映系统的调节性能,进而更准确地跟踪系统功率偏差。以南方互联电力系统为实例,通过仿真与调频试验分析,验证了所提出的三段式B系数能够有效减少频率偏差现象,改善互联电力系统调频控制性能,提高频率质量。
In the interconnected power system frequency control, the fixed coefficient method is generally used to set the frequency deviation coefficient B, which leads to the automatic power generation control (AGC) regulation can not accurately track the power deviation of the system and may even cause serious frequency overshoot or undershoot. Cause the problem of frequency stability. In this context, based on the thermal power and hydropower in power system, different primary frequency-modulated dead zones are usually set. A three-stage B-factor method is proposed to better reflect the regulation performance of the system and to track the system power deviation more accurately. Taking the Southern Power System as an example, the proposed three-stage B-factor can effectively reduce the frequency deviation and improve the frequency control performance of the interconnected power system and improve the frequency quality through simulation and frequency modulation test analysis.