Open AccessReactive power sharing among distributed generators in a microgrid by using virtual current
Author(s) -
Eder A. Molina-Viloria,
John E. Candelo-Becerra,
Fredy E. Hoyos
Publication year - 2021
Publication title -
international journal of power electronics and drive systems/international journal of electrical and computer engineering
Language(s) - English
Resource type - Journals
eISSN - 2722-2578
pISSN - 2722-256X
DOI - 10.11591/ijpeds.v12.i1.pp99-111
Subject(s) - microgrid , computer science , controller (irrigation) , ac power , inverter , matlab , transient (computer programming) , control theory (sociology) , power (physics) , electric power system , small signal model , control engineering , voltage , engineering , control (management) , electrical engineering , physics , quantum mechanics , artificial intelligence , agronomy , biology , operating system
This paper presents a new autonomous effective power distribution control strategy for three-phase parallel inverters. The proposal uses a controller that can provide the system with accurate power sharing among distributed generators installed in the microgrid once some load variations are presented in the network. The methodology uses a virtual current loop introduced into the current controller of the inverter to optimize the output signal, which goes directly to the PWM. This virtual current is obtained by using a virtual impedance loop. Furthermore, a small-signal model of the system is used to check stability of the proposed control strategy, which was developed for island mode operation of the microgrid. Simulations were performed for a microgrid with two generators and a load with five households and implemented in MATLAB/Simulink software. The results show that the model provides a wide margin of stability and a rapid response when electrical loads change, thus fulfilling the reactive power sharing among generators. The proposed method shows a large margin of stability and a rapid transient response of the system.