双馈风电场无功电压分层协调控制的研究

Research of hierarchical coordination control for reactive voltage of doubly-fed wind farm

针对变速恒频双馈发电机和静止同步补偿器(STATCOM)组成的风电场,为了解决大型风电场并网运行的电压稳定性和无功裕度问题,提出面向并网点电压偏差指标和风电场无功源裕度最优的无功电压分层协调控制策略。阐述了双馈发电机组和STATCOM的无功分配原则,基于电压和无功裕度的综合指标构建无功电压分层协调控制策略的目标函数。采用粒子群优化算法的退火不可微精确罚函数法,求解该策略的非线性多约束最优化目标函数。基于Matlab/simulink搭建某风电场的电力系统仿真模型,仿真结果验证了所提控制策略的正确性与有效性。

In a wind farm consists of variable speed constant frequency doubly-fed generator and static synchronous compensator（ STATCOM）,in orderto solve the voltage instability and the reactive power margin issues during the operation of grid-connected,a hierachical coordination control strategy comprehensively consideringthe voltage-deviation indexand the margin optimization of the reactive power sources in large wind farmis proposed in this paper. The reactive power distribution principles of doubly-fedgeneratorunits and static synchronous compensator areelaborated,and then its objective function is constructedon the basis of aggregative indicator of voltage and reactive power margin. The annealing undifferentiable exact penalty functionin particle swarm optimization algorithm is used to solve the multi-constrained nonlinear optimization objective function. Based on Matlab / simulink,the electric power system simulation model of regional power grid with a wind farmis established and then simulation results verify the efficiency and effectiveness of the proposed control strategy.