Decentralized Economic Dispatch Scheme With Online Power Reserve for Microgrids

Abstract

Decentralized economic operation schemes have several advantages when compared with the traditional centralized management system for microgrids. Specifically, decentralized schemes are more flexible, less computationally intensive, and easier to implement without relying on communication infrastructure. Economic operation of existing decentralized schemes is also usually achieved by either tuning the droop characteristics of distributed generators (DGs) or prioritizing their dispatch order. For the latter, an earlier scheme has tried to prioritize the DG dispatch based on their no-load generation costs. Although the prioritization works well with some generation costs saved, its reliance on only the DG no-load generation costs does not allow it to operate well under certain conditions. This paper thus presents a more comprehensive economic dispatch scheme, which considers the DG generation costs, their power ratings, and other necessary constraints, before deciding the DG dispatch priorities and droop characteristics. The proposed scheme also allows online power reserve to be set and regulated within the microgrid. This, together with the generation cost saved, has been verified experimentally under different reserve, load, and DG conditions.

Distributed Control Strategies for Microgrids: An Overview

“…The ED solves an optimisation problem where the goal is to achieve the minimum operating cost of the MG, subject to some operating constraints. It is worth to mention that the ED can be implemented using centralised, decentralised [262]- [267] and distributed control approaches [44], [112], [132], [134], [135], [138], [139], [148], [169], [268]- [281].…”

“…Meanwhile, in [264], a linear droop function is proposed, which is easier to tune and implement to produce a cost reduction. In [267], some constraints, such as voltage, and frequency limits, are included in the optimisation problem. On the other hand, in [262], an adaptive droop has been proposed, with the droop coefficients being based on the maximum generating cost of each DER unit.…”

A Review on Multi-Agent Technology in Micro-Grid Control

“…This improve calculating speed of the method effectively. In [63] , MAS performs an economic dispatch through decentralizd priority ranking. Taking generation shortage for example, each CG Agent inquires cost rate function of its corresponding CG, and finds out the derivative value situates in current output.…”

Aplicação do FCS-MPC para Despacho Econômico em Microrredes Ilhadas

“…Já em Han et alé realizada uma revisão das estratégias de compartilhamento de potência para microrredes ilhadas com controle hierárquico, tendo em foco os problemas associados ao compartilhamento independente de potência ativa e reativa em uma rede com impedância complexa. De forma a incorporar os custos de operação de cada unidade geradora, Nutkani et al (2017) apresenta uma estratégia de compartilhamento econômico de potência baseado na técnica droop visando a redução do custo de operação da microrrede, onde o compartilhamento de potência ativaé realizado proporcionalmente ao custo de cada gerador.…”