Design and Implementation of a Controller for Grid Connected Photovoltaic System
碩士 === 國立彰化師範大學 === 電機工程學系 === 96 === ABSTRACT This thesis proposes a grid-connected photovoltaic system that consists of a boost converter with maximum power tracking, battery charge controller, inverter, and the required control circuits. A sliding mode controller is designed for controlling the...
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| Format: | Others |
| Language: | zh-TW |
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2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/38401720268623861783 |
| Summary: | 碩士 === 國立彰化師範大學 === 電機工程學系 === 96 === ABSTRACT
This thesis proposes a grid-connected photovoltaic system that consists of a boost converter with maximum power tracking, battery charge controller, inverter, and the required control circuits. A sliding mode controller is designed for controlling the boost converter to output the maximum power from the solar cells. A grid-connected inverter is designed to transform the maximum output power into the load and utility. The real power control is realized using zero-cross and phase-lock circuits that control the inverter output voltage which is phase lead and synchronized with the utility. A digital circuit is used to detect the phase angles of the load voltage and current to control the inverter output amplitude to achieve the reactive power load compensation. A monitor circuit is designed to detect the voltage and frequency variation in the utility. When the photovoltaic system encounters a voltage and frequency deviation, the monitor circuit immediately disconnects the photovoltaic system from the utility to prevent the island effect. The proposed approaches are implemented using OP amplifiers and micro controller (PIC16F877A). Both the simulation and experimental results using MATLAB show the sliding mode controller for maximum power tracking has good performance. The phase and amplitude control experiments achieved real and reactive power control. The island effect experiments demonstrated evidence of the solar cell system protection ability illustrating the proposed grid-connected photovoltaic system has good operating performance.
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