Title :
Analysis and Design of a Cost-Effective Voltage Feedback Control Strategy for EPS Inverters
Author :
Yang, Shuitao ; Ding, Xinping ; Liu, Jinyun ; Qian, Zhaoming
Author_Institution :
Zhejiang Univ., Hangzhou
Abstract :
This paper presents a cost-effective voltage control strategy with an output voltage differential inner loop for voltage-sources emergency power supply (EPS) inverters. The output voltage differential feedback effectively eliminates the inherent high-resonant peak of the output LC-filter that may cause instability, thus the Q-factor is no longer sensitive to the load and retains 0.5 or less. Since the stability of the system is greatly increased without high-resonant peak, the compensators become easy to design. The instantaneous voltage feedback outer loop with the PI and PID compensator are analyzed and designed in this paper. Simulation and experimental results are given in this paper to verify that the system, with proposed control strategy, possesses very fast dynamic response and leads itself to both linear and nonlinear loads. In addition, the voltage unbalance of DC-link capacitor are taken into consideration and be solved with modulate signals feedback control.
Keywords :
PI control; Q-factor; emergency power supply; feedback; invertors; power filters; three-term control; voltage control; DC-link capacitor; EPS; PI compensator; PID compensator; Q-factor; cost-effective voltage feedback control design; emergency power supply inverters; inherent high-resonant peak; instantaneous voltage feedback outer loop; linear loads; nonlinear loads; output LC-filter; output voltage differential inner loop; voltage-source inverters; Control system synthesis; Emergency power supplies; Feedback control; Feedback loop; Inverters; Nonlinear control systems; Output feedback; Q factor; Stability; Voltage control;
Conference_Titel :
Power Electronics Specialists Conference, 2007. PESC 2007. IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4244-0654-8
Electronic_ISBN :
0275-9306
DOI :
10.1109/PESC.2007.4342034