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Study of Control Strategy on Small Power Photovoltaic Grid-connected Generation System

Author: PuPengPeng
Tutor: YangHaiZhu
School: Henan Polytechnic University
Course: Control Theory and Control Engineering
Keywords: Solar PV Grid Inverter Maximum power point tracking
CLC: TM615
Type: Master's thesis
Year: 2009
Downloads: 242
Quote: 1
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Abstract


Relative to other green energy , grid-connected PV solar energy can be easily converted into electrical energy grid available to users , so widely used in the electrical energy today , photovoltaic power generation technology is of great significance . Photovoltaic grid-connected inverter control and maximum power point tracking (MPPT) photovoltaic two core part of the grid system . In this paper, the photovoltaic grid control improved fixed frequency SPWM current control strategy , plus an outer ring voltage feedforward control on the basis of the current track inner loop control . Control model , MATLAB system simulation , the results demonstrate that the system to achieve a unity power factor sinusoidal current output of the inverter control grid . At the maximum power point tracking , according to the model of the solar cell output characteristics , proposed a new maximum power point tracking method to replace the traditional tracking solar PV array voltage and current dual - parameter method , while the use of the tracking system, the inverter output current single parameter to achieve MPPT control . Then this paper, the design of MPPT PV grid system based on two-stage transform the structure of the implementation process , carried out a simulation of the control scheme , and verify the correctness and feasibility of the program focuses on the . The proposed method is based on a single parameter control , thus avoiding complex calculations , simplifies the maximum power point tracker , has a strong versatility . For the above analysis and research , the design of the system . Program under the overall control of the photovoltaic system , gives the system structure and parameters of the main circuit selection and design of a prototype based the DSP chip TMS320F2407A control 700W photovoltaic and grid . Specific experimental validation of the system to achieve the various functions of the control scheme proposed in this paper should be completed to establish an important foundation for future research work .

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CLC: > Industrial Technology > Electrotechnical > Power generation, power plants > Variety of power generation > Solar power
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