Study On The Voltage Immunity Of High Proportion Wind Power Access To Power System

As the country vigorously advocates the development and construction of new energy,wind power has become an important trend in the development of the power industry.The wind resources formed by Hexi Power Grid with its unique environmental features make it a historic choice for China's 10 million kilowatts of wind power.However,with the access of large-scale wind power,the randomness and uncertainty of wind power have a serious impact on the original power system.Therefore,this study is important for the development of wind power and the scheduling and planning of Hexi Power Grid.Significance.In order to ensure that the Hexi Power Grid is connected to the grid with high proportion of wind power connected to the grid,the system does not experience voltage collapse,voltage disconnection,etc.It is necessary to know the maximum immunity that the Hexi grid voltage can withstand for a certain disturbance..This dissertation takes Hexi Power Grid as the main research background,and in the case of high-scale wind power access operation,when the network end,the sending end,and the network end and the sending end are simultaneously disturbed,the voltage stability of the system is solved,and the voltage of the transmitting end is improved.The corresponding improvement measures were put forward and the following main work was carried out:(1)For the voltage stability problem when the system is disturbed: the mathematical model of the doubly-fed asynchronous wind power generation system and the equivalent model of the wind farm are established,and the influence of wind power grid-connected operation on the system voltage and the analysis method to be used are studied.The PSASP software platform was used to build a three-machine 9-node system for simple simulation analysis.The system was subjected to impact load and shock load and gust disturbance.The system voltage was changed.Finally,the existing PSASP platform was used.The model of Hexi Power Grid has obtained the anti-interference ability of Hexi Power Grid to these two disturbances,and the corresponding reference indicators are given.(2)The use of superconducting energy storage device(SMES)to improve the voltage stability of the power supply wind farm in Hexi Power Grid is proposed: the theory related to improving voltage stability control measures and the superconducting energy storage device(SMES)system are studied.The influence mechanism,the SMES state space model is established by using the switch function method,and the power model is used to simulate the system voltage stability.The simulation method is carried out in a three-machine 9-node system to prove the proposed method.The feasibility and correctness of the model were finally simulated by the Hexi Power Grid.The analysis of the SMES was carried out to improve the voltage and active and reactive power of the wind farm in the Hexi Power Grid,thus improving the entire Hexi Power Grid.Voltage immunity.