Implementation of Voltage Controller for Single Phase Inverter

• Main Authors: FAN,HAO-RU, 范浩儒
• Other Authors: TSAI,MING-FA
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/89t2g2

碩士 === 明新科技大學 === 電機工程系碩士班 === 106 === The purpose of this thesis is to implement the independent voltage control of single phase DC-AC inverter and independent current control. The inverter output voltage can be stable when operating in standalone mode with voltage feedback control. We propose a phase-locked loop based on the grid voltage, in which the control variable is converted from the stationary coordinate into synchronous rotation coordinate. The design of phase-locked loop is in the synchronous rotating coordinate. Then the independent current control is to obtain the single-phase output voltage signal of the AC grid voltage and the same frequency phase for the current control command, so that the power factor of the controller is approximated to 1 and the electric energy is controlled effectively. First, the AC grid voltage is transferred to the phase-locked loop. The grid voltage and phase are locked and converted to the desired control command in phase to correct the power factor by a PI controller effectively. In this experiment, we replaced the solar power system with a programmable DC power supply. The DC input voltage is converted into AC voltage by a PWM single-phase full-bridge inverter and then connected to an RLC filter circuit to filter out unnecessary noise. The voltage sensor signal, the signal of the AC grid, and the current sensor signal are at the same time feedback to the DSP TMS320F28335 digital signal processor for control operation. This system uses PSIM software to simulate, and then the control is by a digital signal processor DSP TMS320F28335. The codes are written in C programming language to achieve the system circuit implementation.