Adaptive Zone Identification for Voltage Level Control in Distribution Networks With DG

Abstract

A decentralized voltage control is proposed for distributed generation (DG) units to provide short and long-term voltage support in distribution networks. Local controllable zones are used to determine the voltage control boundaries for each DG unit. The number of zones and their size depend on the number, location and size of the DG units, and can be reconfigured in real time in response to network topology changes. The performance and value of the proposed control approach are demonstrated under various operating scenarios. The study is based on the IEEE 33-bus radial distribution network implemented in DIgSILENT PowerFactory.

Reactive power limits in distributed generators from generic capability curves

“…INTRODUCTION Distributed generators (DG) can absorb or inject reactive power for voltage regulation and operation optimization of the grid [1]. Examples of these opportunities are reported in [2], [3] and [4]. Although many control schemes have assumed fixed DG power limits, reactive limits vary depending on the actual generator active power P and terminal voltage V [5].…”

Novel Optimal Coordinated Voltage Control for Distribution Networks Using Differential Evolution Technique

“…Several CVC approaches have been presented in the literature. In (Muttaqi et al, 2015) [8] and (Pachanapan et al, 2012) [9], the control zone and priority concept were introduced, as to ensure the control elements do not interfere with one another.…”

V-I Controllability-Based Optimal Allocation of Resources in Smart Distribution Systems

“…This type of control is usually slow and is effective for long-term voltage support in the system. Since modern DGs are usually interfaced by power converters and can provide fast responses for voltage support, as well as longterm voltage support, they can be used for primary and shortterm voltage control in distribution systems [12]. Short-term and fast voltage support is usually needed when a short-term disturbance, such as a fault, occurs in the system.…”

“…Several researches have been done on DG placement in order to improve the voltage stability margin [10], [11], [13]; however, the voltage and current controllability of distribution systems over all buses and lines have not been studied or addressed in the existing DG allocation studies in the literature, [1]- [11] and [13]. Furthermore, in voltage/VAR control studies, the DG locations are predetermined and are not considered as a means of improving controllability [12], [14], [15]. For instance, Pachanapan et al [12] proposed adaptive zone identification for short and long-term voltage control in distribution systems, and Deshmukh et al [14] demonstrated the application of DGs reactive power for voltage control, regardless of the impact of DG location on the problem under study.…”

“…Furthermore, in voltage/VAR control studies, the DG locations are predetermined and are not considered as a means of improving controllability [12], [14], [15]. For instance, Pachanapan et al [12] proposed adaptive zone identification for short and long-term voltage control in distribution systems, and Deshmukh et al [14] demonstrated the application of DGs reactive power for voltage control, regardless of the impact of DG location on the problem under study. Because controlling bus voltages and line currents can be done with DGs, and the controllability level for the whole system is different for different DG allocation scenarios, an optimization problem should be defined and solved to address this issue.…”