Research On Microgrid Operation Control Based On An Improved Droop Control

At present,there are many problems in the development of China’s energy industry,such as the gradual reduction of traditional energy sources,environmental degradation,and ecological destruction.,and the long-term use of centralized power generation methods has causing serious problems of the environmental pol lution and waste of resources,so the power industry needs Continuously carry out reforms and innovations and explore new development paths.The new technology that is gradually being promoted is distributed generation technology.Its development speed is fast,and related theories and methods are relatively mature.It is gradually applied to power grid control,and it also brings about management of distribution network,safety management,and other aspects.Great changes.The microgrid is a new distribution model,which can manage and control the energy within the entire system,and make the distributed generation system can concentrate the advantages of the previous system,making distributed renewable energy gradually more applications.The current microgrid generally adopts the droop control method.The advantages of this method are reflected in many aspects.On the one hand,it can make the frequency and voltage control more reasonable and reduce the dependence on the communication system.Operation and management are also more flexible,so the future of microgrid will have broader application prospects.In this paper,we first systematically elaborated the control strategy of microgrid,and then based on the droop control theory to analyze the droop control strategy and the adjustment of frequency and other parameters,making the microgrid operating environment more reasonable.Specifically include the following aspects:(1)Firstly,the definition,structure and research significance of microgrid are expounded.The current research status of microgrid is analyzed and the significance of microgrid based on droop control is determined.(2)Secondly,the power system conversion algorithm is analyzed in detail,and the mathematical model of the three-phase full-bridge inverter based on the coordinate system is constructed;then the voltage and current vector controllers are systematically designed and completed.Effective control of the amount.(3)The third is to discuss the traditional droop control strate gy.For the traditional droop control method,the lower multi-inverter needs to distribute the power based on the output impedance.It is difficult to guarantee the distribution of the inverter.The output power is reasonable.Therefore,a virtual impedanc e can be added in one coordinate,so that the control of the output impedance value is more reasonable,thereby achieving a more reasonable distribution of the inverter output power.(4)A detailed study of the synchronizing generator power quasi-synchronous parallel devices was conducted.The deficiencies in its application to microgrid systems were analyzed.Based on this,a quasi-synchronized grid control strategy for microgrid systems was designed.This method can effectively reduce the impact of micro-source virtual inertia on the system synchronization adjustment.(5)In the end,MATLAB/Simulink and other tools were used to implement the simulation test of the control strategy designed in this paper,which proved the rationality and effectiveness of the method,and can provide a reference for its practical application.