Optimal Decentralized Voltage Control for Distribution Systems With Inverter-Based Distributed Generators

Abstract

The increasing penetration of distributed generation (DG) power plants into distribution networks (DNs) causes various issues concerning, e.g., stability, protection equipment, and voltage regulation. Thus, the necessity to develop proper control techniques to allow power delivery to customers in compliance with power quality and reliability standards (PQR) has become a relevant issue in recent years. This paper proposes an optimized distributed control approach based on DN sensitivity analysis and on decentralized reactive/active power regulation capable of maintaining voltage levels within regulatory limits and to offer ancillary services to the DN, such as voltage regulation. At the same time, it tries to minimize DN active power losses and the reactive power exchanged with the DN by the DG units. The validation of the proposed control technique has been conducted through a several number of simulations on a real MV Italian distribution system

Reactive power limits in distributed generators from generic capability curves

“…4 presents a family of FCG capability curves for different terminal voltages. These curves were obtained from the formulation presented in [15] and [17].…”

Active Management of Low-Voltage Networks for Mitigating Overvoltages Due to Photovoltaic Units

“…Refs. [30]- [33] propose a decentralized control scheme of the reactive power to control the voltage and/or minimize system losses. Based on voltage sensitivity analysis, the authors of [34] suggest a control scheme to achieve the same goals, while [35] aims at minimizing the losses inside a microgrid.…”

The coordinated voltage control meets imperfect communication system

“…This section will revisit the independent DG control approach in [17] and then propose a coordinated DG control method. The difference between these two control methods will also be discussed.…”

“…[17]. According to (4), each value of active power with specific power factor working point has the maximum reactive power output value.…”