含DSTATCOM和分布式电源配电网的无功电压协调控制

Reactive Voltage Coordinated Control for Distribution Network with DSTATCOMs and DGs

提出一种基于斜率调节的配电网静止同步补偿器(DSTATCOM)群的协调控制方法,用于解决同一区域内多个分布式电源的无功电压协调控制问题。建立计及网架参数条件下,无功电压与分布式电源输出有功电流及斜率调节下DSTATCOM输出无功电流之间的关系,并根据装置的最大无功容量整定各个DSTATCOM的调节斜率,合理分配各个装置的无功输出,将已整定的斜率以及线路的电抗之和作为无功电流的比例增益作为负反馈,构成DSTATCOM新的电压参考值,建立基于斜率调节的DSTATCOM群协调控制策略。针对一个含有双分布式电源和DSTATCOM的配电网系统进行仿真,仿真结果表明:该整定斜率调节下能够进行协调各DSTATCOM无功动态行为,不需要控制器间实时通信实现装置无功出力且能够按比例分配并稳定系统电压。

A coordinated control method for distribution static synchronous compensator(DSTATCOM)group based on slope adjustment is proposed to solve the coordinated control problem of reactive voltage with multi-distributed generators(DGs)in the same area.By taking into account the parameters of grid,the relationship between the reactive voltage,the output active current of DG and the output reactive current of DSTATCOM is established,Then,based on the maximum capacity of DSTATCOM,the slope adjustment of each DSTATCOM is set up to rationally allocate the reactive power output of each device.Thirdly,the reactive current proportional gain which is constituted by the sum of the slope setting and reactance of the corresponding line to the reference voltage is taken as a negative feedback to constitute the new voltage reference value of the DSTATCOM,and the coordinated control strategy of DSTATCOM group is established based on the slope adjustment.Finally,a network with dual DGs and DSTATCOMs is simulated to show that the slope setting will coordinate the dynamic reactive behavior of each DSTATCOM,allocate the output reactive power proportionally and stabilize the system voltage without real-time communication between the controllers.