Development of Control System for New Medium Voltage Power Flow Control Device

The power flow control device (PFCD) has been developed to control the medium voltage (MV) networks. The advantage of the proposed MV PFCD is the ability to control the power flow in the transmission line without taking into account the parameters of the line and the network operation mode. The main elements of the MV PFCD are two power converters: an active rectifier and an autonomous inverter. The principle of power regulation of the MV PFCD is a vector voltage drop regulation across the additional reactive element introduced into the power line. The article is devoted to the development and research of a vector control system of the MV PFCD. Taking into account the peculiarities of the MV PFCD functioning, the structure of the control system of MV PFCD power converters has been proposed to be a closed-loop with negative feedback loops. The MATLAB model of 0.4 kV power network with the MV PFCD has been developed to test the proposed MV PFCD control system. The external characteristics of MV PFCD converters confirm that control system is able to provide an accurate execution of control commands. The response of the MV PFCD control system during the load rejection and load rise has been investigated. It has been established that the developed control system fully implements MV PFCD declared functions.