Research On AGC Of Two Area Interconnected Power Grid Based On Fuzzy Control Theory

Modern power grid is a multidimensional and dynamic interconnected system,the system widely distribute on structure,also closely link in the function.It has nonlinearity,uncertainty and time-varying characteristics.The Automation Generation control(AGC)is an important measure to maintain the system frequency and the tie line exchanged power.In recent years,China’s level of modernization and economy has made great development,with the growth of power load,the unstable impactive factors which affect the power grid are gradually increasing.At the same time,the scale of all kinds of distributed power grid is expanding accompanied by the promotion of new energy.The random and intermittent power greatly increase the fluctuation range of power grid,so the emergence of these factors put forward higher requirements on the control performance of AGC system.First of all,this paper introduces the basic principle of automatic generation control,then have a comparative analysis of the three kinds of AGC control mode under single area.On this basis,in view of the interconnected power grid operation mode,further analyzes the characteristics of the six combined control strategy between the two different regions,and educe the applicable occasions of each strategy.Combined with the CPS standard to design a kind of parameter self-tuning control scheme which applied to the AGC system.Making models of the each energy transfer processes in AGC system and building two area interconnected power system model in MATLAB,using the parameter self-tuning fuzzy control strategy.Comparing the simulation with the classical PI control from three aspects,the analysis shows that the method for load frequency control performance is improved.This paper explained the error of the fuzzy control regulation.Without increasing any fuzzy control rules,attempt to improve the performance of the controller from the perspective of variable domain.Design a new kind of domain scaling factor to simplify the calculation.At the same time,in order to coordinate the CPS assessments and unit action.The fuzzy control rules are improved for seeking a “relaxation”control.In the results of MATLAB simulation,the AGC system with variable universe fuzzy controller has smaller steady frequency error and shorter setting time,so as to verify the superiority and practicability of this control method.