Research On Control Strategy Of Wind Solar Hybrid Power Generation System Based On Hybrid Energy Storage

Energy is an important material basis for the survival and development of human society,which is related to the national economy and people’s livelihood and national strategic competitiveness.At present,the world energy pattern has undergone profound changes,and the relationship between supply and demand has generally slowed down.However,the response to climate change has entered a new stage of competition,and a new round of energy revolution has officially opened.China’s economic development has entered the new normal,energy consumption continues to grow,and supply side structural reform and energy transformation have a long way to go.This paper focuses on the research of distributed generation energy supply and the safe operation of microgrid system,taking wind power,photovoltaic and energy storage as the research objects,aiming at ensuring the safe,economic and efficient operation of microgrid,focusing on the following four aspects of research work on the coordinated control strategy of distributed generation.(1)This paper studies the utilization of renewable energy abroad and analyzes the domestic development trend.In view of the global demand for clean energy utilization and efficient production,through the establishment of mathematical model,the principle of wind power generation,photovoltaic power generation and power maximum tracking method are studied to improve the utilization efficiency of renewable energy power generation;(2)Aiming at the special requirements of distributed generation in microgrid,such as various types of distributed generation,different load characteristics,flexible control mode and plug and play of distributed generation in microgrid,a comprehensive control strategy based on hybrid energy storage of battery and super capacitor is proposed.The strategy considers the power constraint and charge constraint of energy storage,and adopts coordinated droop control method to control power By restraining the fluctuation of energy storage rate,the complementary advantages of the two types of energy storage are effectively brought into play,the economic benefits are improved,and the power quality is guaranteed;(3)Aiming at the problem of constant bus voltage control in microgrid caused by intermittent distributed generation and random switching of various loads,this paper proposes a multi-mode voltage stability control strategy of bus voltage fluctuation,adopts the basic method of bus voltage subsection droop control,realizes the real-time tracking of load change by energy storage system,improves the accuracy of load power distribution,and achieves bus voltage stability The purpose is to keep the line voltage constant;(4)For distributed generation and Microgrid energy supply system,in terms of power supply,both synchronous generator and photovoltaic power generation output AC energy and DC energy;in terms of operation characteristics,both traditional rotating equipment have large inertia characteristics and fast response power electronic devices;in other aspects,there is still complex and special mixing phenomenon of electromagnetic transient and electromechanical transient.In order to solve the above problems,this paper uses the international large-scale electrical general simulation software PSCAD / EMTDC to build the mathematical model,and carries out relevant simulation research,which provides theoretical guidance for the successful application of hybrid energy storage in microgrid,and provides a better solution for the realization of multi-mode bus voltage stability control.