Energy management layered control method of light-storage-combustion direct-current power supply system

Abstract

The invention relates to an energy management layered control method of a light-storage-combustion direct-current power supply system. The method comprises the steps of 1) carrying out the upper-layercontrol design of energy management: defining the energy EBus in a direct-current bus capacitor of the system as a smooth output variable, defining the direct-current bus voltage vBus as a state variable, defining a total load current reference track pHPSoref as a control variable, defining a nonlinear differential smoothing controller and a feedback control law to realize the stable control of the voltage of the direct-current bus, and obtaining a total load current reference track needed by the lower-layer control at the same time; 2) defining the lower-layer control for carrying out energymanagement: according to a simplified dynamic system formed by a super-capacitor, a storage battery and a fuel cell converter, constructing a prediction control model to realize the reasonable distribution of power among all power supplies. Compared with the prior art, the system has the advantages of layered control, wide stability margin, high degree of freedom, simple structure and the like.

Description

technical field [0001] The invention relates to the field of energy management control, in particular to an energy management layered control method for an optical-storage-fuel DC power supply system. Background technique [0002] Photovoltaic power generation is intermittent and random, and fuel cells are difficult to quickly respond to photovoltaic power generation and power load transients due to slow internal electrochemical and thermodynamic reactions. In order to further improve the quality of power supply, combined with supercapacitors and batteries, the solar-storage-combustion DC power supply system can smooth the fluctuation of photovoltaic output power and improve the reliability of power supply. For the solar-storage-combustion DC power supply system composed of photovoltaics\fuel cells\battery batteries\supercapacitors, the key to the further promotion and application of the hybrid DC power supply system is to realize the coordinated control and optimal energy d...

AI Technical Summary

Problems solved by technology

However, the existing nonlinear smooth differentiable method is difficult to complete the task of optimal power distribution among multiple power sources considering the charge and discharge rate limit of the energy storage unit while realizing the stable control of the fuel cell and the energy storage unit.

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