Research On Power Grid Peak Shaving Based On Lithium-Ion Battery Energy Storage

As my country’s economy transforms from rapid development to high-quality development,the country has put the coordinated development of the environment and the economy in a prominent position.However,the rapid economic development has caused the power grid to face the problem of further widening the peak-to-valley gap,resulting in a series of problems such as imbalance between power supply and demand and unstable power supply quality.In recent years,electrochemical energy storage technology has made major breakthroughs,and its technical maturity and economy have been greatly improved.Building energy storage power stations on the user side to participate in grid peak shaving has become the best way to solve this problem.Energy storage power station participates in power grid peak shaving,AC/DC conversion is an important part of it,and energy storage converter is the device that completes this work.In this process,the control of the converter is the current research hotspot.Therefore,based on the research of energy storage converters,this article focuses on the control methods of DC/DC converters and AC/DC converters,and builds energy storage power stations in the software to participate in the power grid peak shaving model,start simulation verification.The main contents are as follows:(1)For the DC/DC conversion part of the energy storage converter,the DC bus voltage drops severely during charging and discharging when the energy storage power station participates in the peak shaving process.The Fuzzy PI double closed-loop control is proposed,the traditional PI control model and the Fuzzy PI control model are built,and the simulation verification is carried out on the simulation platform to provide more stable voltage support for the subsequent AC/DC converter.(2)In view of the non-linear problems existing in the energy storage converter participating in the peak shaving process of the power grid,the control performance of the PI controller of the AC/DC converter is reduced,and the dynamic response speed is slow and the robustness is poor.problem.A super spiral sliding mode control algorithm is proposed.The converter model under three control algorithms of PI control,sliding mode control and super spiral sliding mode control is built in MATLAB/Simulink,and it is verified under the conditions of simulating the peak shaving of the power grid.The proposed algorithm has stronger dynamic response performance and robustness.(3)Study the peak shaving performance of energy storage converters under different control algorithms.First,the constraint conditions and evaluation indicators for energy storage power stations to participate in peak shaving and valley filling are established,and the working principle of the constant power charging and discharging strategy is analyzed in detail.Finally,based on the historical typical daily load curve of an industrial park in Xi’an,Shanxi Province,the energy storage power station is set up The simulation results verify that the super spiral sliding mode controller applied to the energy storage converter is better than the PI control in the performance of participating in the peak shaving of the power grid.