Title :
A current decoupling parallel control strategy of single phase inverter with voltage and current dual closed-loop feedback
Author :
Xu, Shuangang ; Xu, Jianpign
Author_Institution :
Sch. of Electr. Eng., Southwest Jiaotong Univ., Chengdu, China
Abstract :
The output characteristics of a single phase inverter with voltage and current dual closed-loop feedback control are analyzed and the equivalent model of the parallel operating single phase inverter system is introduced. The relationship between the circulating current and the amplitude/phase of inverter reference signal is analyzed, based on which a current decoupling control strategy of parallel operating inverter system is proposed. The active and reactive components of the inverter output current can be decomposed and the decoupled control of inverter reference amplitude and phase can then be carried out. Furthermore, a three-phase balance current is constructed according to instantaneous reactive power theory to decompose the active and reactive components of output current and its block diagram is given. The prototype is developed and the control of two parallel operating 2kVA inverters is realized. The experimental results show its feasibility and effectiveness.
Keywords :
closed loop systems; invertors; reactive power control; amplitude/phase; apparent power 2 kVA; circulating current; current decoupling parallel control; current dual closed-loop feedback control; inverter reference signal; reactive components; reactive power theory; single phase inverter; three-phase balance current; voltage dual closed-loop feedback control; Feedback control; Filtering theory; Impedance; Inverters; Reactive power; Uninterruptible power systems; Voltage control; circulating current; instantaneous reactive power theory; parallel operating;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2010 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-5286-6
Electronic_ISBN :
978-1-4244-5287-3
DOI :
10.1109/ECCE.2010.5618256
