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控制区域间交流联络线功率存在自然波动以及因各种扰动引起的波动,波动幅值过大时,可能引起系统稳定及电压问题,影响互联电网的安全稳定运行。文中基于某大区互联系统交流联络线功率波动的实际数据,利用频域分析和自相关分析方法对联络线功率波动进行全面分析,发现功率波动中周期在110s左右的分量比较突出这一特点。产生该现象的原因是电网区域控制偏差(ACE)的实时调整,即ACE实时调整环节虽能显著抑制ACE中的低频慢速分量,但对周期在110s左右的分量有放大作用,但综合来看ACE实时调整对抑制联络线功率波动是有利的。最后,通过在某大区实际开展的试验进行了验证,退出ACE实时调整后周期在110s左右的分量显著减小,而低频分量增大。该研究为深入分析大区互联系统交流联络线随机功率波动机理和控制措施改进提供了依据。
There are natural fluctuations in the power of communication lines between control zones and fluctuations caused by various disturbances. When the fluctuation amplitude is too large, it may cause system stability and voltage problems, which may affect the safe and stable operation of the interconnected power grid. In this paper, based on the actual data of the power fluctuation in the communication link of a regional interconnected system, the power fluctuation of the tie line is analyzed comprehensively by using the methods of frequency domain analysis and autocorrelation analysis. It is found that the components with period of 110s are more prominent in the power fluctuation. The reason for this phenomenon is the real-time adjustment of grid control deviation (ACE). That is to say, the real-time adjustment of ACE can significantly inhibit the low-frequency slow component of ACE, but amplifies the component with a period of about 110s. ACE real-time adjustment of the power line to suppress fluctuations in the power line is beneficial. Finally, through experiments carried out in a large area, we verified that the component of 110s after exiting ACE real-time adjustment significantly decreased and the low-frequency component increased. The research provides the basis for further analysis of the random power fluctuation mechanism and control measures in the communication link of the regional interconnected system.