Digital Control for Bi-directional Inverter under Power Factor Correction Mode

• Main Authors: Ruei-Chi Chang, 張瑞騏
• Other Authors: T.-F. Wu
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/47711413019834082520

碩士 === 國立中正大學 === 電機工程所 === 98 === The purpose of this thesis is to propose a predicted current control (PCC) algorithm for a bi-directional inverter (BDI) under power factor correction (PFC) mode. The BDI is applied to the dc solar power system to improve efficiency and utilization of conventional photovoltaic grid-connection systems. The utility needs to supply load power when the power generated by the PV panels is lower than the demand. Under this condition, the BDI is operated in PFC mode to regulate the dc-bus voltage to a certain range. The proposed PCC takes into account the inductance variation in determining control law for shaping inductor current. The dc-bus voltage regulation is achieved by a linear control algorithm. It can regulate dc-bus voltage to different operating points according to current levels. A single-chip microcontroller dsPIC30F2023 is adopted to realize the controller which has the advantages of higher reliability and easier to maintain. Finally, a 5 kW BDI under PFC mode has been built and tested. Experimental results have verified the proposed algorithms and feasibility of the system.