Title :
A bi-directional resonant DC/DC converter with frequency tracking control
Author :
Qicheng Huang ; Keyan Shi ; Xiaoyu Jia ; Changsheng Hu ; Dehong Xu
Author_Institution :
Inst. of Power Electron., Zhejiang Univ., Hangzhou, China
Abstract :
A two-stage bi-directional resonant DC/DC converter with frequency tracking control is analyzed. The first stage is Buck/Boost converter which is used to regulate the voltage gain. The second stage is series resonant converter (SRC) that acts as a solid state transformer (SST) to achieve isolation with high efficiency and high power density. To realize accurate and fast frequency tracking for series resonant converter, the dynamic model and design method of phase lock loop (PLL) control are investigated. In addition, the design of power factor angle of the resonant network is discussed to achieve higher efficiency. The controller of the bi-directional resonant DC/DC converter which consists of bi-directional inner current loop and outer voltage loop and frequency tracking loop is given. Finally, the control scheme is verified on a 5kW prototype.
Keywords :
DC-DC power convertors; control system synthesis; frequency control; gain control; phase locked loops; position control; power factor; power transformers; resonant power convertors; voltage control; PLL control; SRC; SST; bidirectional inner current loop; buck-boost converter; dynamic model; frequency tracking control; outer voltage loop; phase lock loop control; power 5 kW; power density; power factor angle design; resonant network; series resonant converter; solid state transformer; two-stage bidirectional dc-dc converter; voltage gain regulation; Bidirectional control; Bridge circuits; Frequency control; Reactive power; Resonant frequency; Voltage control; Zero voltage switching;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Conference_Location :
Pittsburgh, PA
DOI :
10.1109/ECCE.2014.6954051
