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Impact Of Renewable Energy Multi-grid Connection Mode On The Voltage Of Gaoyou Power Grid

Posted on:2020-07-28Degree:MasterType:Thesis
Country:ChinaCandidate:W ZhouFull Text:PDF
GTID:2392330611454915Subject:Engineering
Abstract/Summary:PDF Full Text Request
In recent years,with the rapid development of China's economy,the crisis of traditional fossil energy has become increasingly prominent,which also makes the research and application of new energy a hot spot.Among them,solar photovoltaic power generation and wind power generation have the characteristics of clean,environmental protection and easy to use,and become the focus of new energy power generation construction.Distributed new energy projects have also achieved rapid construction and development in Gaoyou area.The introduction of new energy improves the energy utilization rate in Gaoyou area.This paper studies the stability of power grid in Gaoyou area under various renewable energy connection modes,which has certain theoretical significance and engineering application value.Renewable energy connection can be divided into two operation modes: connection to micro-grid and direct centralized connection to distribution network.Under this background,based on practical engineering cases,this paper calculates and analyses the system voltage stability under two application scenarios of micro-grid and large-scale centralized access in Gaoyou Industrial Park after new energy access,and draws corresponding conclusions.The main contents of this paper are as follows.1.The voltage control measures of microgrid are expounded.Then,three typical distributed generations and their corresponding mathematical models in power system are elaborated in detail.Starting from the principle and model of doubly-fed wind turbine,the model construction and control strategy of doubly-fed wind turbine are discussed.Furthermore,the principle,mathematical model and output characteristics of micro-gas turbine and photovoltaic power generation system are studied respectively.Finally,the influence of power is analyzed.The factors of system voltage lay a foundation for the following research on voltage stability of distributed energy after grid-connected in Gaoyou campus microgrid2.The structure and operation mode of the microgrid and the corresponding control methods are discussed in detail.Taking an industrial park in Gaoyou as an example,a simplified microgrid model with distributed photovoltaic,wind power and micro gas turbines is established in the PSCAD simulation software.Then the voltage stability of the park under the condition of distributed power supply access and fault is analyzed by software simulation.3?Finally,In order to study the impact of renewable energy on the power grid in Gaoyou area under the condition of large-scale centralized connection,this paper takes the background of 100 MW wind power in eastern Gaoyou area and 20 MW photovoltaic power generation project in Yangzhou Post Capital Park as an example.Then evaluates and calculates the voltage limit of wind power grid-connected operation point,the influence of wind farm output variation on reactive power and voltage,the fluctuation of system voltage under different operation conditions,the voltage deviation of photovoltaic grid-connected point,voltage unbalance and harmonics.Analysis and calculation of the grid voltage stability in Gaoyou area under the centralized connection to renewanble energy...
Keywords/Search Tags:Wind power generation, Photovoltaic power generation, Microgrid, Voltage stability, PSCAD Simulation
PDF Full Text Request
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