基于惰速点整定的新型同步调相机并网成功率提高方法

目前国内的新型同步调相机多采用惰速并网方式,该惰速过程不可控、不可逆,提高在该并网方式下的并网成功率是节约经济成本的关键所在。文中考虑调相机完整的惰速过程,计及该过程中的主要损耗,通过分析调相机侧与电网侧频率差、相角差的变化规律,得到在惰速开始时刻调相机侧与电网侧相角差对并网成功率的影响。通过进一步分析惰速开始时刻调相机转速对并网成功区域起始位置的影响规律,提出一种惰速点转速的整定方法,在严格满足并网条件的前提下,提高了并网成功率。结合算例,验证了惰速点整定方法的可行性,并且通过统计准确预测出完整的迭代次数及整定后的最终惰速点,减少了整定过程中的信息传输量。

Improvement Method of Grid-connection Success Rate for New-type Synchronous Condenser Based on Idle Speed Point Setting

At present, the grid-connection process of most new-type synchronous condensers in China is achieved in the idle speed mode, which is uncontrollable and irreversible. Therefore, the improvement of the grid-connection success rate of the grid-connection process is the key to minimize the corresponding economic cost. Considering the complete idle speed process of the new-type synchronous condenser and the main loss during the process, this paper analyzes the change rule of frequency difference and phase angle difference between the synchronous condenser and the power grid. Then the influence of the phase angle difference between the synchronous condenser and the power grid on the grid-connection success rate at the start of idle speed is obtained. Based on the analysis of the influence of the condenser speed on the initial position of grid-connection success area, the adjustment method of the speed at the idle speed point is proposed, which is able to improve the grid-connection success rate with satisfaction of the strict grid-connection requirements. Finally, the example results validate the feasibility of the proposed idle speed point setting method, and the complete iteration times and the final idle speed point are predicted accurately by statistics, while the required information during the setting process is significantly reduced.