Micro-grid distributed controller parameter determination method based on linear quadratic optimization

Abstract

The invention discloses a micro-grid distributed controller parameter determination method based on linear quadratic optimization, and belongs to the technical field of micro-grid running control. Based on droop control, a micro-grid small signal model of reactive equipartition and average voltage recovery is built; the micro-grid small signal model is converted to multiple single-input single-output submodels corresponding to single input of all distributed power sources; designing a dispersive type output feedback controller and a linear quadratic optimization target function; selecting a stable feedback controller, calculating the change rate of the linear quadratic optimization target function to the feedback controller, and based on the change rate, improving the feedback controller,so that the quadratic optimization performance of the improved controller is superior to the performance of the controller before improvement, and thus a local optimal distributed controller is obtained. By means of the method, based on a linear quadratic optimization strategy, a micro-grid distributed controller is designed, the reactive power equipartition and the average voltage recovery in themicro grid are achieved, and thus the overall electric energy quality of the micro grid is improved.

Description

technical field [0001] The invention discloses a method for determining parameters of a distributed controller of a microgrid based on linear quadratic optimization, and belongs to the technical field of microgrid operation control. Background technique [0002] With the depletion of the earth's resources and people's increasing concern about environmental issues, the access to renewable energy has attracted more and more attention from all over the world. Microgrid is an emerging energy transmission mode that increases the penetration rate of renewable energy and distributed energy in the energy supply system. Its components include distributed energy such as micro gas turbines, wind generators, photovoltaics, fuel cells, and energy storage devices ( Distributed Energy Resources, DER), user terminals of various electrical loads and / or thermal loads, and related monitoring and protection devices. [0003] The power supply inside the microgrid is mainly responsible for energ...

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Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned background technology, to provide a microgrid distributed controller parameter determination method based on linear quadratic optimization, and to decompose the microgrid small signal model into corresponding distributed power sources based on static output feedback. The single-input and single-output model of the distributed secondary controller transforms the parameter design of the distributed secondary controller into the parameter design of the distributed controller, realizes the equal sharing of reactive power and average voltage recovery of the microgrid, and solves the problem of complex communication of centralized control technical problems and propose a feasible solution for the parameter design of distributed controllers

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