Reactive voltage coordinated control for distribution network with DGs and DSTATCOMs

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. © 2015 State Grid Electric Power Research Institute Press.