摘要
对于配电网静止同步补偿器(distribution static synchronous compensator,DSTATCOM),并网电压的相位实时检测是无功功率检测以及各种坐标变换的关键。在传统的基于同步旋转坐标系的锁相环的基础上,提出了基于级联延时信号消除(cascaded delayed signal cancellation,CDSC)的锁相环算法,以抑制电网电压负序分量和谐波分量对检测结果的影响,并采用拉格朗日插值算法提高相位检测的精度和速度。将该方法应用于负载平衡和不平衡情况下的星形连接的级联式DSTATCOM系统中,平衡情况下采用基于分相控制和有功电压矢量叠加法的控制策略,不平衡情况下采用基于分相控制和零序电压注入法的控制策略,仿真结果验证了控制方法的正确性和有效性。
For DSTATCOM（distribution static synchronous compensator）, real-time phase monitoring for grid voltage is critical to reactive power detection and various coordinate transformations. On the basis of traditional phase-locked loop under synchronous rotating coordinate, an improved strategy based on CDSC-PLL（cascaded delayed signal cancellationphase locked loop） algorithm is studied to inhibit the effects of negative-sequence and harmonic components on grid voltage, and an optimization strategy based on Lagrange interpolation algorithm is used to improve the accuracy and speed of phase detection. This method is applied in cascade DSTATCOM system under star connection with balanced and unbalanced load. Hierarchical control and active voltage vector superposition method are adopted for balanced load, while hierarchical control and zero-sequence voltage injection method are adopted for unbalanced load. The validity of the control strategy is verified with simulation results.
出处
《电网技术》
EI
CSCD
北大核心
2015年第7期1989-1994,共6页
Power System Technology
基金
国家自然科学基金项目(51307174)~~
