Fuzzy Based Load-frequency Control in an Interconnected Power System with Wind Turbine

It’s important to realize, optimized dispatching of generating units would be useless without a method of control. Frequency regulation in interconnected network is one of the main challenges posed by wind turbine in modern power system. Obviously the method of load frequency control (LFC) plays a vital role in large interconnected power system. However the modern LFC should be able to handle complex multi objective regulation optimization problems and to ensure that the LFC systems are capable to maintain generation load balance, following serious disturbances. The additional injection of mechanical power due to rapid increases of wind power fluctuation imposes a power imbalance between generation and load it tends to causes the frequency deviation from nominal value. Based on the obtained wind turbine model, a power control structure was developed that takes into consideration the dynamical aspects of the wind turbine as well as constraints. This thesis addresses a new eminent of LFC with fuzzy controller for simultaneous minimization of frequency deviation and tie line power changes in the presence of high penetration of wind turbine. It can be done by proposed model of fuzzy controller with the optimized data and an explicit parametric controller, a novel control method, was designed using MATLAB for two area wind power system. Key word control, load-frequency control, wind power generation. INTRODUCTION Wind energy is currently the fastest-growing source of electricity in the world. Wind power investment worldwide is expected to expand threefold in the next decade, from about $18 billion in 2006 to $60 billion in 2016 [1]. According to the American Wind Energy Association, the installed capacity of wind grew at an average rate of 29% per year [2]. In most power systems, the output power of wind turbine generators varies with wind speed fluctuation, this fluctuation results into frequency variation [3]. Load Frequency Control (LFC) is to regulate the power output of the electric generator within an area in response to changes in system frequency and tie-line loading .Thus the LFC helps in maintaining the scheduled system frequency and tie-line power interchange with the other areas within the prescribed limits. A high penetration wind power, the power system frequency regulation can be affected due to wind power fluctuation. This leads to imbalance between power generation and power demand, and as a result, frequency will deviate from its nominal value. Significant frequency deviations may cause under/over frequency relay operations and finally disconnect some parts of system loads and generations. Although conventional controllers have been broadly used for decades as the load frequency controllers, they are not more efficient for modern power system, considering increasing size, changing structure, and new uncertainties. Journal of Innovative Research and Solutions (JIRAS) ISSN: 232