Abstract
For the operation of autonomous microgrid (MG), an essential task is to meet the load demand sharing using multiple distributed generation (DG) units. The conventional droop control methods and its numerous variations have been developed in the literature in order to realize proportional power sharing amongst such multiple DG units. However, the conventional droop control strategies are subjected to power sharing error because of non-trivial feeder impedances of medium-voltage MGs. Further, complex MGs configurations (mesh or looped networks) usually make to reactive power sharing and system voltage regulation more challenging. This paper presents an optimal control strategy in order to perform the proportional power sharing and voltage regulation for multiple feeders in islanded AC MGs. The case study simulation for optimizing the power sharing and voltage regulations in proposed control strategy has been verified through using MATLAB/Simulink systems.
Highlights
The application of distributed power generation such as wind turbine, photovoltaics’ and fuel cell has been experienced a fast development in the past decades [1] [2]
In order to sort out these aforementioned problems, the idea of MG has been emerged, which is based on the control of multiple distributed generation (DG) units
All three buses Vbus1, Vbus2, and Vbus3 are fed through two DG units DG1 and DG2 interfaced using three phase, three wire power electronics inverters connecting through feeder impedances with three linear loads Rload1, Rload2 and Rload3.This proposed strategy is composed on load estimation and optimal steady state estimator regulator
Summary
The application of distributed power generation such as wind turbine, photovoltaics’ and fuel cell has been experienced a fast development in the past decades [1] [2]. In order to reduce the tradeoff among reactive power sharing and bus voltage deviations in multi feeders a recent control strategy is developed in [20] where a Kalman filterbased state estimator used which required high bandwidth date rate. The salient contribution of this work can summarized as follows:1) The load is estimated at respective feeders which reduces the bandwidth data requirements; 2) The proposed optimal control strategy achieved task of proportional power sharing and system voltage regulation for multiple buses simultaneously. In the grid-connected operation mode, the active and reactive reference usually are allocated by central controller and in order to track the power the conventional droop control strategy can be used. When micro grid is operating in islanded mode, the load demand of MG should be properly shared by DG units In this mode of operation, the DG units can operate using conventional power frequency droop control strategies as. Vi *,ωi , DP and DQ are the nominal voltage magnitude, nominal frequency, real and reactive power slops, respectably for ith DG unit
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