Microgrid frequency regulation method with electric vehicles based on mpc and pi control methods

Abstract

The invention adopts a microgrid frequency regulation method with electric vehicles based on MPC and PI control methods. The invention makes full use of the characteristics of the electric vehicle battery itself as an energy storage device, and with the support of the electric vehicle grid connection technology (V2G), it participates in the frequency adjustment of the microgrid to compensate the microgrid itself when the isolated grid is running. Insufficient load frequency control. In the scheme of the present invention, for each control cycle, the state quantity of the system at the current moment is first obtained through the state observer, and the MPC controller is used to solve the optimal control input variable and its corresponding predicted state quantity, and the solution result is used to optimize the PI control parameters in the controller, that is, to reset the proportional parameters and integral parameters. Finally, the PI controller with optimized control parameters is used to realize the adjustment and control of the frequency of the microgrid until the arrival of the next control cycle. The invention can realize better control effect, and has global robust performance and strong reliability performance.

Description

technical field [0001] The invention relates to the field of power system frequency regulation control, in particular to a microgrid frequency regulation control strategy with electric vehicles based on MPC and PI control methods Background technique [0002] Microgrid is a new energy system model that integrates local renewable energy power generation systems, clean energy power generation systems, energy storage devices, and various loads, and is receiving more and more attention. The microgrid system can operate in both grid-connected and off-grid modes. When the microgrid is running in an isolated state off-grid, it must have its own frequency control strategy to ensure that the microgrid can continue to operate normally and for re-connection to the grid. prepare. When the microgrid operates in an isolated state, the frequency control and the distribution of unbalanced power become the focus of research, because the micro-sources (such as wind power and photovoltaics) c...

AI Technical Summary

Problems solved by technology

[0005] Another purpose of the present invention is to solve the technical problems existing in the prior art; Provide a kind of adaptability that overcomes PI controller to operating conditions, and dynamic performance also obtains positive improvement; Can effectively avoid MPC problem when solving unfeasible The problem of being unable to control, at this time the whole system can still operate effectively, and the reliability of the control method is strengthened. The micro-grid frequency modulation method with electric vehicles based on MPC and PI control methods

Images