Open AccessThe new power sharing method for threephase parallel inverters with nonlinear loads
Author(s) -
Phúc Duy Lê,
Dai Tan Le,
Hieu T. Pham
Publication year - 2015
Publication title -
khoa học công nghệ
Language(s) - English
Resource type - Journals
ISSN - 1859-0128
DOI - 10.32508/stdj.v18i1.937
Subject(s) - ac power , integrator , control theory (sociology) , total harmonic distortion , computer science , matlab , nonlinear system , controller (irrigation) , power (physics) , voltage , inverter , harmonics , power factor , electrical impedance , engineering , control (management) , electrical engineering , agronomy , physics , quantum mechanics , artificial intelligence , biology , operating system
This paper presents a new method for controling parallel inverters to share active power and reactive power in the energy system with non-linear loads. In these systems, the virtual output impedance is usually added to the control loop of each inverter to improve the active power and reactive power sharing as well as the quality of the voltage system. Paper also proposes a kind of virtual impedance as a second-order general-integrator (SOGI) scheme. The simulation results in Matlab Simulink show the ability of the proposed controller to good share power P-Q, when connected with unbalanced and nonlinear loads. By using the proposed algorithm allows to reduce the voltage THD to 1.9% and 1.2% for unbalanced and nonlinear loads according by comparision with traditional control scheme.