The Power Quality Analysis And Energy Efficiency Management For Distributed Generation System

As a renewable and clean energy source,wind,photovoltaic and hydropower have the characteristics of wide distribution,zero pollution,widespread and good spatial complementarity,making photovoltaic power generation,wind power generation and hydropower generation an important part of distributed generation systems.The micro-grid is a new technical means for integrating distributed power generation systems into distribution network,which can effectively integrate renewable energy sources(solar energy,wind energy,water energy,etc.)energy storage and load.The multi-source complementary micro-grid constructed by distributed power sources such as wind,photovoltaic and hydropower can improve the utilization of resources effectively.However,due to the large number of users using nonlinear loads and the integration of a large number of power electronic devices inside the micro-grid,the power quality of the micro-grid has a great impact.Therefore,the operating state and power quality parameters of the micro-grid need to be real-time.Monitoring also requires further improvements in power quality to maximize the use of renewable energy.Based on the previous researches on photovoltaic power generation,wind power generation and hydropower generation,this thesis comprehensively utilizes wind energy,solar energy and water energy to form a small distributed power generation system,and monitors the power quality of the system in real time.In order to improve the reliability of power supply,a series of measures have been taken to improve the power quality of the system.For the power quality analysis of the building wind / photovoltaic / hydropower storage power generation system,the DSP+LabVIEW scheme is adopted,and the hardware circuit and software program design are completed at the same time.The data acquisition module,data processing module,peripheral circuit module are all made a detailed introduction.On this basis,combined with virtual instrument technology,built a power quality online monitoring system based on DSP and LabVIEW.Energy efficiency management designed a reactive compensation device based on STM32 microcontroller to improve the power quality of distributed generation system.The data acquisition module uses the ATT7022 EU dedicated energy measurement chip to collect data.It is more suitable for small distributed generation systems by designing the capacitance capacity and switching rules.Finally,the experimental analysis confirmed the feasibility of the design system.