| ABSTRACT: With the dwindling traditional fossil fuels and increasing environmental pollution, frequent bad weather conditions now have become global issues.Renewable and clean energy applications development are gradually occupied the commanding heights of the national energy strategy. Electricity as is currently the most widely used energy style, increase the renewable power generation sector in the proportion of clean energy is an inevitable choice for the current stage of development of the power industry. In addition, as wind power, solar power and other distributed power rapid development, research and distributed power grid related technologies and distributed power output of consumptive related topics become a hot research field of electrical engineering disciplines.As the traditional distribution network is based on the user side of the passive design, incorporated a large number of distributed power distribution network with respect to network operation and design planning to bring a series of problems.Because wind power, photovoltaic power generation and other distributed generation technology itself is intermittent and volatility characteristics of its distribution network access will change the distribution network after the original one-way flow of the tide, and the distribution network grid loss, impact quality of power supply and distribution grid operation with reliability and so on. Through the building of wind power, photovoltaic power generation are two of the most common simulation model of distributed access110kV power distribution network model to study the distributed power distribution network access associated with changes in net loss of performance indicators, combined with the text of the comprehensive evaluation model to evaluate the proposed distribution network energy efficiency,and to identify and recommend ways to improve energy efficiency in accordance with its current level of energy efficiency.Firstly, several of the most commonly used applications and distributed power technology development status and their respective advantages and disadvantages introduced. And studied the doubly-fed wind power and photovoltaic power generation principles and mathematical model output power.Secondly, I build a photovoltaic power generation system in MATLAB/Simulink simulation platform and wind farms and five nodes by the doubly-fed wind turbine distribution network consisting of110kV main circuit.Two research papers distributed power and the net-related controls, including built PWM rectifier, DC/DC chopper and wind power, photovoltaic power generation control policy model. In the two kinds of distributed power distribution network access process, by adjusting the position of the access nodes, distributed power capacity and access to distributed power output of the power factor,the simulation of each node observed current, voltage changes, to project changes in net loss of transmission lines, harmonic distortion, voltage unbalance three operating parameters, such as the distribution network.Finally, the current access for distributed power in the energy efficiency of the distribution network of a single assessment methods, the lack of relevance of the status quo, Based on simulation data with distributed power grid access, combined with a variety of mathematical evaluation methods to construct6input and two output indicators index evaluation system for energy efficiency. To calculate the index weight in the combined evaluation index weight calculation model simulation and actual operating data distribution network.Combined with AHP, DEA, gray related degree analysis formed a new integrated evaluation model is applicable to this article. These new methods for distributed power distribution network access to the distribution network energy efficiency rating is more scientific and targeted energy efficiency assessment for the distribution network and the distribution network of the implementation of energy loss reduction system provides ideas and methods. |
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