角形级联型STATCOM不平衡工况下的无功功率控制策略

发布时间：2018-04-15 19:53

本文选题：角形静止同步补偿器 + 正序无功功率　；参考：《电力系统自动化》2017年20期

【摘要】：针对电压不对称工况下级联静止同步补偿器(STATCOM)的无功功率控制问题,提出一种适用于角形级联型STATCOM的柔性无功控制策略,通过改变正序和负序无功功率指令值的比例,能够在电压不对称工况下柔性地调节输出的正序和负序无功功率,改善公共连接点电压。结合应用于常规两电平的柔性无功控制策略与角形STATCOM电流控制指令求解方法,利用相量分解法,推导了电压不对称工况下的零序电流和相电流解析表达式,所提策略利用电压和电流瞬时值实时计算电流指令,具有较好的动态性能,同时根据推导的相电流表达式可以实时限制相电流幅值最大值,在提供无功功率的同时可以确保STATCOM运行在安全范围以内,提高了STATCOM的工程实用性。最后,仿真验证了所提方法的正确性和有效性。
[Abstract]:In order to solve the reactive power control problem of cascade static synchronous compensator (STATCOM) under asymmetrical voltage conditions, a flexible reactive power control strategy for angular cascade STATCOM is proposed. By changing the ratio of positive sequence and negative sequence reactive power instruction value, a flexible reactive power control strategy is proposed.It can flexibly adjust the output reactive power of positive sequence and negative sequence under the condition of voltage asymmetry, and improve the common connection point voltage.Combined with the flexible reactive power control strategy applied to conventional two-level and the solution method of angular STATCOM current control instruction, the analytical expressions of zero sequence current and phase current under the condition of voltage asymmetry are derived by using phasor decomposition method.The proposed strategy uses instantaneous voltage and current to calculate the current order in real time, which has good dynamic performance, and the maximum amplitude of phase current can be limited in real time according to the derived phase current expression.At the same time, the reactive power can be guaranteed to operate within the safe range of STATCOM, and the engineering practicability of STATCOM is improved.Finally, the simulation results show that the proposed method is correct and effective.
【作者单位】：湖南大学电气与信息工程学院;
【基金】：国家自然科学基金资助项目(51237003)~~
【分类号】：TM761.12

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