Abstract
The presence of distributed generators (DGs) with high penetration poses new challenges in the management and operation of electrical grids. Due to the local character of DGs, they could in principle be used in emergency situations to prevent a voltage instability event of the grid. In this paper, a certain method is proposed to coordinate the operation of virtual power plant (VPP) and conventional voltage regulation device to improve the static voltage stability of distribution network with the multi-agent framework. The concept and the general framework of this coordinated control system is introduced, and the voltage instable nodes are determined based on the voltage instability indicator. The voltage coordinated control model of the distribution system is established according to the multi-agent consistency control theory and the coordinated controllers for agents are designed by solving a problem with bilinear matrix inequality constraints. The suggested method is implemented on an IEEE 33 nodes test system and the simulation results show its efficiency and validity.
Highlights
Various policies and incentives like feed-in tariff schemes facilitate the installations of distributed generators DGs and renewable energy resources (RES)
Comparable to a conventional power plant, the virtual power plant (VPP), either operated in centralized(direct) control [3], multi agent based hierarchical control [4] or fully distributed control scheme [5], is to integrate distributed energy resource (DER), energy storage units and controllable loads that geographically dispersed in grid into a special power plant, with the aims to: facilitate the participation of DERs in energy markets in the same manner as conventional generating unit, DERs can experience economies of scale in market participation and benefit from intelligence on market participation to maximize revenue opportunities [6,7,8]; provide ancillary services needed by distribution and transmission network operators for system security needs, such as frequency control, voltage control, congestion management, improvement of voltage quality, network restoration, islanded operation, and optimization of grid losses
The paper analyzed the voltage stability of distribution network with DGs and found out the weak nodes in terms of static voltage stability of the system according to voltage instability coefficient of each node
Summary
Various policies and incentives like feed-in tariff schemes facilitate the installations of distributed generators DGs and renewable energy resources (RES). The static voltage stability based on the load flow equation theory of distribution system is proposed in [15, 16], and the further improvement of voltage stability index (VSI) is discussed in [17]. In this paper,a coordinated consistency control method in multi-agent framework that coordinates VPP and conventional voltage regulation means including e.g. static synchronous compensator STATCOM to improve the static voltage stability of ADNs is proposed.
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