Simulation of wind power

Simulation of wind power with front-end converter into interconnected grid system, In the growing electricity supply industry and open access market for electricity worldwide, renewable sources are getting added into the grid system. This affects the grid power quality. To assess the impact on grid due to wind energy integration, the knowledge of electrical characteristic of wind turbine and associated control equipments are required. The paper presents a simulation set-up for wind turbine in MATLAB / SIMULINK, with front end converter and interconnected system. The presented control scheme provides the wind power flow to the grid through a converter. The injected power in the system at the point of common coupling is ensured within the power quality norms.

Generation of electricity from wind is the fastest growing energy technology in the world. India is in the 4th rank and has a renewable energy gross potential installed of 7855 MW as on 2006.With increasing wind power production, it is important for grid owners, to predict the grid interaction of wind turbine in advance. Some grid simulation packages like power system simulator are used for power system behavioral studies. Models of new types of generating units, like wind turbine have to comply with the requirement. Considering wind turbine generating system operation in electric power system, it is necessary to utilize the steady state model for analysis, related to load flow, short circuit calculation, power quality assessments, etc. The electric utility grid system cannot accept connection of new generation plant without strict condition, due to the real power fluctuation and reactive power generation of wind plants. Therefore the penetration of wind power in grid implies taking care of power quality issues like voltage variation on grid, switching operation of wind turbine (Reid, 1996). Today grid connected wind turbines are equipped with power converter systems. The wind–generation system interconnected with power system as shown.

In modern wind turbine system, power is exchanged with grid through a dedicated power interface so as to improve the power quality norms and it should compensate for harmonics and reactive power in the system. The typical system is simulated for practical condition in power system and simulated results are presented. The proposed control keeps the unity power factor at the point of common coupling (PCC) and allows the system voltage be stable while compensating the reactive and real power demand of the load. The dynamics of the system and control action is simulated with the detail model of wind generator with front end converter system. This simulation is carried out in SIMULINK with power system block set