基于风力发电机简化RX模型的电力系统状态估计

Power System State Estimation Based on Simplified RX Model of Wind Power Generator

为了充分考虑风能随机性对电网安全稳定性的影响,更精确地反映风力发电机组工作机理区别于传统电源的特殊性,对含风力发电机的电力系统进行状态估计时,文章用简化RX模型来等效风力发电机,把滑差作为状态量引入到状态估计过程,建立了相应的数学模型。这种方法考虑了异步发电机本身的特性,可以与原有的状态估计程序进行高效融合,比基于传统RX模型进行状态估计的计算量小,且计算精度满足要求。算例计算结果表明:该方法性能良好,在含有风力发电机的电力系统状态估计中有较好的应用前景。

In order to take the influence of random of wind power into account adequately and reflect the particularity of working mechanism of wind power generator units that is different from traditional generators more precisely, in the state estimation of power grid containing wind power generators it is proposed in this paper that the simplified RX model is used to be equivalent to wind power generator, and as one of the state variables the slip of wind power generator is led into state estimation process and corresponding mathematical model is built. Taking its own specific characteristic of asynchronous generator into account, the proposed method can efficiently be merged with original state estimation program and the calculation burden is lighter than using traditional RX model, besides, the calculation accuracy of the obtained results is satisfied. Results of calculation example show that the proposed method possesses good performance and can be well applied to the state estimation for power grids containing wind power generators.