Virtual Synchronous Generator Technology And Its Application In Energy Routers

In recent years,with the global energy crisis and the environmental pollution of continuous increase,the application of new energy technology has attracted people's attention.All countries and scholars are actively studying the technical application of new energy in power system.However,the access to the indefinite power of renewable energy power generation devices makes the traditional power system and power equipment unable to meet diversified needs in the form of power supply.The concept of an energy internet has come into being.This article studies the core part of the energy Internet-energy router,focusing on exploring its circuit topology and control strategy of the inverter.Energy router to meet the needs of input and output of power grid and load,so the circuit topology needs to have strong scalability and compatibility.control strategy of the energy router needs to have greater flexibility,and have better stability control ability.This article uses a virtual synchronous generator(VSG)control strategy on the inverter side.Unlike traditional inverters,the VSG can simulate the characteristics of the synchronous generator's moment of inertia and electromagnetic damping.When the power imbalance in the system,the VSG suppresses fluctuations caused by the output power and its own frequency by using the virtual moment of inertia and electromagnetic damping.In this paper,VSG technology used in the energy router make better control effect.In this paper,the following work has been done:Firstly,the VSG is taken as the research object,VSG technology has characteristics similar to synchronous generators(SG),such as large output impedance,large moment of inertia,and distribute power according to the droop characteristics.Stability of the VSG is analyzed by small signal analysis method.At the same time,the relationship between parameter of VSG and energy storage capacity under three kinds of damping conditions is analyzed.And the simulation of VSG in different modes is carried out.Then,Based on the control parameter of the virtual moment of inertia and the electromagnetic damping coefficient of the VSG can be flexibly adjusted according to the requirement of the system,transient response to VSGs is modeled optimally.The parameter adaptive VSG control strategy is designed.Through the simulation,the parameter adaptive VSG control is verified,and the VSG control and the parameter adaptive VSG control curve is compared by simulation.Finally,Establish model of distributed power components and energy storage system This paper takes the system energy router without energy storage whose interface is PV and load as an example,The fixed parameters VSG and parameter adaptive VSG technology applied to the energy router and simulation.And energy router system with the energy storage to do simulation verification,The simulation results verify the feasible and effectiveness of VSG technology used in energy router.