Direct-current microgrid power distribution controller design method based on passivity theory

Abstract

The invention relates to a direct-current microgrid power distribution controller design method based on a passivity theory. The method comprises the following steps that (1) a fuel cell mathematic model is built; (2) the inductive current and capacitor voltage of a control circuit are adopted as system state variables, and a state space model of a direct-current microgrid is built; (3) a Hamilton model of the direct-current microgrid is built; (4) according to the Hamilton model, an IDA-PBC method is adopted for obtaining a control law of a power distribution controller. When load power changes, the power distribution controller controls output power of a fuel cell and a super capacitor, the fuel cell is made to output stably-changing power, the super capacitor is made to provide peak value transient state power for loads, load power needs are met, and direct-current bus voltages are stabilized. Compared with the prior art, the controller enables a direct-current microgrid closed-loop system to be asymptotically stabilized, and the utilization rate of energy is improved.

Description

technical field [0001] The invention relates to the technical field of power system control, in particular to a design method for a DC micro-grid power distribution controller based on the theory of passivity. Background technique [0002] Distributed energy sources in DC microgrids can be divided into two types: intermittent power sources and continuous power sources according to their output power regulation characteristics. The output power of intermittent power supply is greatly affected by natural conditions such as weather, and the output has obvious fluctuations and intermittences, which brings great challenges to the stable operation of the microgrid. In order to ensure the maximum utilization of renewable energy, the intermittent power supply adopts the Maximum Power Point Tracking (MPPT) control method and does not participate in the power regulation of the microgrid system. Continuous power sources such as fuel cells have relatively reliable primary energy supply...

AI Technical Summary

Problems solved by technology

However, the adjustment speed of the continuous power supply of the fuel cell is relatively slow. In order to meet the different power demands of local users and the seamless and smooth transition of the operating state of the microgrid, it is necessary to cooperate with a supercapacitor to ensure reliable power supply of the microgrid in various operating states.

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