Configuração Modificada de D2VC (Dynamic Direct Voltage Controller) com Controle CC Baseado em Teoria PQ

Abstract

This paper proposes a modified structure for the Dynamic Direct Voltage Controller (D2VC), here defined as Modified Dynamic Direct Voltage Controller (MD2VC) for application in distribution grids. An advantage of this controller structure is the online voltage compensation in distribution systems using a three-phase Voltage Source Converter (VSC) for the shunt side of the controller instead of three single- phase VSCs as in the case of the original proposed configuration of D2VC. In this case, the series VSCs are connected to the shunt VSC by only a single dc link, unlike the original configuration where, for each of phase, the series VSC is connected to the respective shunt VSC by the respective dc link. In this work, a control algorithm for dc-link voltage based on pq theory is proposed, dismissing the use of the adaptive hysteresis band current single-phase control strategy. This configuration of D2VC has the number of switches for shunt converters and dc links reduced. Simulation results carried out in time domain using PSCAD/EMTDC are presented to show the effectiveness of the proposed control.