Fractional order model predictive control method for power of electricity-hydrogen hybrid energy storage system

Abstract

The invention discloses a fractional order model prediction control method for the power of an electricity-hydrogen hybrid energy storage system, and the method comprises the eight steps: respectively giving equivalent circuit diagrams when a switching tube is switched on and switched off in two working modes of a BOOST circuit and a BUCK circuit, and monitoring an inductive current change process and a capacitor voltage change process. A fractional order calculus algorithm and model prediction control are combined for power control of an electricity-hydrogen combined hybrid energy storage system and device, a fractional order type voltage and current prediction model is obtained, double-loop control is adopted, the switching state of an energy storage converter is selected through prediction output, the output current of the converter relative to a bus is accurately controlled, and the energy storage efficiency is improved. The power fluctuation of distributed power generation is stabilized more finely, and the defects that the response speed of current common double-loop PI control is low, deviation possibly occurs during prediction of existing integer order model prediction control, and the current control precision is low are overcome.

Description

technical field [0001] The invention relates to the technical field of electric-hydrogen combined hybrid energy storage system control, in particular to a fractional-order model prediction control method for the power of an electric-hydrogen hybrid energy storage system. Background technique [0002] With the proposal of "carbon peak" and "carbon neutral" dual-carbon goals and the urgent need of energy transformation in my country, it is imperative to build a low-carbon and safe energy system and develop a green and efficient energy storage system. There are many ocean-going islands in my country, and the important equipment on the islands urgently needs a power supply with high reliability and high power quality. Therefore, the energy storage system plays a central role in smoothing power fluctuations in the island microgrid. With the sharp increase in the installed capacity of wind power and photovoltaics in my country, the phenomenon of abandoning wind and solar has occur...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fractional-order model predictive control method for the power control of electric-hydrogen combined hybrid energy storage systems and devices, aiming to solve the problem of the slow response speed of the commonly used double-loop PI control and the control accuracy of the existing model predictive control. Low disadvantages, smoothly stabilize the power fluctuations of distributed generation and other issues

Images