Title :
A Novel and Practical Multi-Loop Control Strategy for Photovoltaic Inverters Based on DSP
Author :
Gong, Ren-Xi ; Shu, Peng-Fei ; Xie, Ling-Ling ; Wei, Jiong-Quan
Author_Institution :
Coll. of Electr. Eng., Guangxi Univ., Nanning, China
Abstract :
A novel and practical multi-loop control strategy for photovoltaic (PV) inverters is presented. In which the double close-loop control structure of digital PID voltage and current instantaneous value is adopted based on the cross feedback decoupling control and load current feed-forward control. In addition, in order to improve accuracy of output voltage, a close loop control structure of the output voltage RMS value is utilized. The mathematical model for single-phase full-bridge inverters is established. The operation principle of decoupling control and the control strategy are discussed in details. A 50Hz 1kW prototype with TMS320F2812 DSP as controller is developed to validate the effectiveness of the control strategy.
Keywords :
PWM invertors; closed loop systems; digital control; digital signal processing chips; electric current control; feedback; photovoltaic power systems; three-term control; voltage control; DSP; RMS value; close loop control; cross feedback decoupling control; digital PID current; digital PID voltage; frequency 50 Hz; load current feed forward control; mathematical model; multiloop control; photovoltaic inverter; power 1 kW; single phase full-bridge inverter; Control systems; Digital signal processing; Inductors; Inverters; Transfer functions; Voltage control; Voltage measurement;
Conference_Titel :
Power and Energy Engineering Conference (APPEEC), 2011 Asia-Pacific
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-6253-7
DOI :
10.1109/APPEEC.2011.5749127
