基于软件优化的D-STATCOM新型控制策略

摘要

控制延时会导致配电网静止同步补偿器(D-STATCOM)对谐波抑制和无功补偿的精度降低。为改善传统控制策略滞后时间长、补偿效果差的缺点，提出了一种基于软件优化的新型控制策略。通过对D-STATCOM补偿指令电流的特性进行分析，对软件流程进行相应调整，缩短了谐波和无功补偿指令电流的计算延时，使补偿滞后大大减少，谐波抑制和无功补偿的精度得到明显提高。该策略无需复杂算法，实现简单、有效。在Matlab/Simulink环境中进行了仿真分析，并且研制了一台容量为10 kVA的三相四线制D-STATCOM实验样机进行验证，结果证明了新型控制策略的正确性和可行性。%Control delay significantly affects the performance of distribution static synchronous compensator (D-STATCOM) in harmonic suppression and reactive power compensation. To overcome the drawback of the conventional control method, which has long compensation delay and low compensation accuracy, a novel control strategy based on software optimization is proposed. Software flow is adjusted based on the analysis of the reference compensation currents. It shortens the calculation delay of harmonics and reactive power compensation reference current, so compensation delay occurs less and compensation accuracy of harmonic suppression and reactive power compensation is improved. Results obtained by D-STATCOM simulations system built in Matlab/Simulink and prototype experiment of a 10 kVA three-phase four-wire D-STATCOM show the validity and feasibility of the proposed strategy.