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Design and Realization of the Signal Phase Photovoltaic Grid-Connected Inverter

Author: MeiZhiWei
Tutor: ShenYi
School: Harbin Institute of Technology
Course: Control Science and Engineering
Keywords: Solar PV Grid Inverter Digital Signal Processor Maximum power point tracking
CLC: TM464
Type: Master's thesis
Year: 2009
Downloads: 593
Quote: 2
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Abstract


With three traditional fossil energy depletion, green energy development and utilization will be an unprecedented development. Solar energy as the world's cleanest one of the green energy, and power generation universal concern of much of the world. Photovoltaic grid-connected inverter is the core component of grid-connected PV systems, how reliable and high quality power to the power grid is particularly important, renewable energy and power generation systems play a role of power conversion inverter has become a hot research topic. Single phase photovoltaic grid-connected inverter as the object of study, and the topology of the network system, control strategy MPPT maximum power point tracking and islanding protection has done a detailed analysis and research, the main content: Through common main circuit of the inverter system topology analysis and comparison, the DC-DC-AC system topology. DC-DC link select the the double parallel Boost circuit and replace the high-frequency transformer, improve the efficiency of the system and reduce the equipment size; level inverter aspects after select full-bridge structure. Choose the TMS320F2812 high-performance fixed-point DSP as systems main control unit, take full advantage of the powerful DSP computing power and wealth of on-chip peripheral functions, hardware circuit design is relatively simple, and the system output has a good dynamic response. Solar cell equivalent circuit model to analyze the solar battery output characteristics, and on this basis to study various MPPT maximum power point tracking algorithm. The theoretical analysis of the circuit state changes produce islanding method proposed and Passive islanding protection. The two topologies for DC-DC and DC-AC, respectively, using a separate control program, before the class to achieve the MPPT and boost function, after control DC bus voltage stability and phase with the output current with the grid voltage frequency, and by Simulink simulation verify the theoretical feasibility of the control scheme. The study based on the theoretical analysis, indicators for a given design the main circuit and control circuit and parameter selection. Developed a grid-connected inverter sub-module debugging prototype hardware circuits and software programs, and experimental results are given. Prove the design of the prototype system performance through the analysis of experimental data and test waveforms, reliable and feasible design ideas.

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