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Three-phase photovoltaic inverter control algorithms and software realization

Author: MaQiang
Tutor: TianShuLin
School: University of Electronic Science and Technology
Course: Measuring Technology and Instruments
Keywords: three-phase PV grid-connected inverter control strategy SVPWM Matlab/Simulink simulation
CLC: TM464
Type: Master's thesis
Year: 2011
Downloads: 621
Quote: 1
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Abstract


The extraction and continuous use of coal, petroleum and other conventional energy resources, causing the concerns about the remaining reserves and ecological issues. In recent years, photovoltaic grid-connected power system research received more and more attention by the state and society. PV grid-connected inverter is an equipment which converses direct current flow into alternating current flow, and sends the current to the grid. And the inverter is the core component of photovoltaic grid-connected power system. For the requirements of high-power photovoltaic grid-connected power system, the three-phase PV grid-connected inverter control algorithm is researched in this paper and experimental prototype by 10 kilowatts to verify the feasibility of the proposed control algorithm.According to the working principle of three-phase PV inverter, the main circuit topology, the display module for LCD, RS485 communication module are respectively designed. By comparing the advantages and disadvantages of voltage type three-phase PWM and current type three-phase PWM, the voltage type three-phase PWM are determined as the main circuit topology of the system. Analysis of the grid-connected principle of three-phase PV grid-connected inverter and the control algorithms in control process. By Matlab/Simulink simulation tools, the system is simulated, the simulation results show that the correctness of the control algorithm. Finally, through the use of DSPF2812 chip of TI company and the CCS platform, the above control algorithms and the various modules are realized by software programming.This paper mainly contents are as follows:(1) Through the analysis of three-phase PV grid-connected inverter grid control strategy, choosing the MPPT algorithm and islanding detection algorithm for this system.(2) Expound on the mathematical theory basis for implementing SVPWM algorithm, and combining with the circuit topology of the system, the coordinate transformation, the sector division, the calculation of switching time such specific algorithms are deduced in details. Conjunction with the specific algorithm, using Matlab/Simulink simulation tools , the three-phase PV inverter system is simulated to verify the consistency of theoretical analysis and simulation results.(3) According to the functional requirement of PV grid-connected inverter, the software architecture is designed. through using the configuration of DSP/BIOS , the control section, communication part, display and setting part of the three-phase PV grid-connected inverter are developed, including sampling ADC module calibration, SVPWM control algorithm, LCD display and setting, RS485 communication, etc.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
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