Research On Distributed Energy Consumption Technology Based On Flexible Multi-state Switches

With the increase in the penetration rate of distributed energy and the increasing high-quality load,the technical demand for coordinated control of network source and load is becoming more and more urgent.However,the "closed-loop design and openloop operation" structure of the traditional distribution network cannot be amicably connected to large-scale distributed energy sources,and it is difficult to meet the highreliability power supply requirements of important loads.As a new form of power supply structure,flexible interconnected distribution network can not only form a new mode of closed-loop power supply,but also provide a source-load coordination technology platform at the distribution network level.This article takes the core equipment of flexible interconnected distribution network-Flexible Multi-State Switch,FMSS as the research object,a distributed energy consumption strategy based on power redistribution between feeders is proposed,which can effectively improve the consumption capacity of distributed energy and increase the utilization rate of renewable energy.The specific research contents are as follows:First,the flexible multi-state switch based on voltage source converter is introduced.explained in detail its circuit structure,working principle,mathematical model,control strategy,analyzed its control strategy under different working conditions,and designed its overall control strategy.Secondly,in response to voltage quality problems caused by distributed energy access to the distribution network,use the flexible power control capability of the flexible multi-state switch to suppress.explains the principle of the flexible multi-state switch to improve power quality through the power flow control capability,an overall control strategy based on flexible multi-state switches to improve voltage quality is proposed,an example is used to verify the effectiveness of the flexible multi-state voltage quality improvement strategy.Then,in response to the problem of the fluctuation of distributed energy output in the system that limits the absorption capacity,an improved control strategy for surface absorption based on flexible multi-state switches is proposed,and a fuzzy droop rule based on multiple factors is established.The fuzzy rules are used to optimize the parameters of flexible multi-state switches in real time to achieve surface absorption optimization based on flexible multi-state switches.The simulation verifies that the strategy can accurately and quickly distribute the unbalanced power on the DC side,taking into account voltage quality and power distribution issues can further improve the capacity of distributed energy consumption.Finally,a flexible multi-state switch and energy storage combined absorption strategy that takes into account SOC balance is proposed,which realizes power transmission between feeders and stabilizes power fluctuations within a certain period of time,and has an energy storage function on the original basis.,To realize the regulation strategy of maximizing the consumption of distributed energy in the distribution network.