Design and Implementation of a Single-Phase Micro-Inverter in Solar Power System

• Main Authors: YANG, BO-XIANG, 楊柏祥
• Other Authors: OU, SHENG-YUAN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/7acw5c

碩士 === 國立臺北科技大學 === 電機工程系 === 107 === This thesis is aimed at designing and implementing a single-phase micro-inverter in solar power system, which utilizes a micro-controller TMS320F28035 as the control core. The implemented micro-inverter has two conversion stages, including a maximum power point tracker and a single-phase full-bridge inverter. The perturbation and observation method is implemented in the maximum power point tracker to achieve maximum power point tracking and improve conversion efficiency. This thesis uses the unipolar voltage switching in the single-phase full-bridge inverter to reduce the total voltage harmonic distortion. Furthermore, this thesis designs the output low-pass filter of single-phase full-bridge inverter through simulation, derives the small signal model, and obtains the open-loop transfer function for PI controller in order to achieve the goal of outputting stable voltage. The solar simulator PVS01203 acts as the system input source in which the maximum power 100W, maximum point voltage 76V and maximum point current 1.31A are set as the simulation specifications. To verify that the maximum power point is obtained under the designed digital control strategy, the experimental specifications are input DC voltage 220V, output voltage AC110V/60Hz and output power 100W. The realized micro-inverter power for solar system complies with the harmonic specification of IEC 61000-2-2. The experimental results conduct the control strategy and the feasibility of the design.