Optimal Active Power Dispatch Calculation Method for VSC-MTDC

Abstract

Using VSC-MTDC is treated as the promising solution to increase power transfer capacity and system reliability. However, traditional active power optimal control methods do not comprehensively explore the transmission capacity of the system from an overall perspective. Considering the flexible power consumption characteristics of different accessed systems in VSC-MTDC, a novel optimal active power dispatch calculation method is proposed in this paper, to provide appropriate active power dispatch scheme for VSC-MTDC. The optimization method could calculate the maximum capacity of the renewable energy integration within the DC grid capacity based on the current active power distribution, and give the corresponding DC power flow. Meanwhile, factors such as the system capacity, consumption characteristics are considered to guarantee the reasonability of the active power dispatch scheme. A large-scale VSC-MTDC system established in MATLAB show that the proposed optimal active power dispatch calculation method can maximize renewable energy output; moreover, the optimization method is helpful to avoid the overload of DC transmission lines and converter stations, and enhance the overall power transfer capability.