Research On The Impact Of Wind Power On Electric Power System Stability And Control

In today's growing energy shortages, dramatic changes in climate, environment, worsening global backdrop, wind energy as a clean, renewable energy sources by the national attention. According to Global Wind Energy Council (GWEC) statistics show that from 1996 to 2009 period, the cumulative installed capacity of wind power of the world's average growth rate reached 28.6%, showing a rapid and sustained growth. China has a vast coastline, abundant wind energy resources. Since 2008, the organization of the National Energy Bureau under the Census and wind energy resources to the provinces the construction of wind power based on preliminary work, seven million kilowatts of wind power base in planning have been completed. Most of the seven wind power base in the network end of the power grid structure is not strong enough, the power structure is a single, large-scale wind power Access to these areas will bring great pressure to run power system stability. Therefore, research on the impact of large scale wind farm integration on power system becomes an important issue to design and develop the wind power system.First, several main types of wind power generation system and basic working principle were introduced. Wind power for squirrel-cage induction system and Doubly-fed induction wind power system dynamic model was established, including wind speed model, air dynamic model, transmission model, pitch control system model, the generator model and the equivalent wind farm model. The generator model includes squirrel-cage induction generator model and double-fed induction generator.Secondly, the squirrel-cage induction generator wind farm model and the double-fed induction generator wind farm model were set up in the Matlab/Simulink environment. The squirrel-cage induction wind power system stability mechanism and double-fed induction wind power system stability mechanism were studied by simulation analysis. Doubly fed induction wind turbine decoupled active and reactive power, which means that torque and the rotor can be independently controlled excitation current. Doubly-fed induction wind turbines with reactive power control capability to provide grid voltage support, thus, compare with squirrel-cage induction wind turbine, double-fed induction wind turbine has obvious advantages, is the main development tendency of the wind turbine in the future. Finally, on the basis of the above, with double-fed induction generator wind farm consisting of three-machine system model was built in the Matlab/Simulink environment, and the stability of the wind farm, the system angle stability and voltage stability were analyzed of the disturbance by wind speed, wind farm export failure, system line fault. And bring up the concept of the proportion of wind farm's security capacity.