8 - Distributed coordinated voltage control for distribution networks with DG and OLTC based on MPC and gradient projection

Abstract

Chapter 8 proposes a distributed coordinated voltage control scheme for distribution networks with DG and on-load tap changer (OLTC). In this chapter, static synchronous compensators (STATCOMs), DG units, and OLTC are coordinated to mitigate voltage fluctuations and minimize the number of operations of OLTC while considering different temporal characteristics of voltage regulation devices. The optimization problem of coordinating DG units and STATCOMs is decomposed by the gradient projection method. The OLTC control scheme is designed to correct long-term voltage deviations based on model predictive control while minimizing the number of operations. Moreover, a unidirectional communication-based coordination mechanism between fast var devices and OLTC is designed. A distribution network with two 20kV feeders and 10 DG units was used to validate the control performance of the proposed coordinated voltage control scheme.