基于无功功率分解的DFIG与STATCOM的功率协调控制

Power Coordinated Control of DFIG and STATCOM Based on Reactive Power Decomposition

针对风速随机变化及短路故障引起的风电场并网点电压波动问题,提出了一种基于瞬时无功功率分解的双馈风力发电机组(DFIG)与静止同步补偿器(STATCOM)的功率协调控制策略。首先,根据DFIG和STATCOM二者无功响应时间的不同,对新疆某地区风电场并网点某个典型日所需无功功率数据进行分频、重构,再通过计算进而可确定二者的容量比;利用小波包分解算法将风电场并网点实时所需无功功率调节量分频、重构为两个频段,分别作为DFIG和STATCOM的参考功率,协调二者平抑风电场无功功率波动。最后根据该地区风电场搭建了Matlab仿真控制模型,验证了所提功率协调控制策略的有效性。

To address voltage fluctuations at grid connection points of wind farms caused by random changes in wind speed and short-circuit faults,a power coordination control strategy based on instantaneous reactive power decomposition of Doubly Fed Induction Generator(DFIG)and Static Synchronous Compensator(STATCOM)is proposed in this paper.First,according to the different reactive response time of DFIG and STATCOM,the reactive power data required for a typical day of a wind farm grid connection point in a certain area of Xinjiang is divided and reconstructed,and then the capacity ratio of the two can be determined;the wavelet packet decomposition algorithm is used to divide and reconstruct the real-time reactive power adjustment required by the wind farm grid connection into two frequency bands,which are used as the reference power of DFIG and STATCOM respectively,and coordinate the two to suppress reactive power fluctuations.Finally,a Matlab simulation control model is built according to the wind farms in the area,and the effectiveness of the proposed power coordination control strategy is verified.