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Undisturbed switching-based multi-target running optimal control method of microgrid

A technology of non-disturbance switching and optimal control, which is applied in the fields of power electronics, communication and control

Active Publication Date: 2019-04-02
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of multi-mode stable operation of the micro-grid system, ensure the stability of the micro-grid mode switching and the continuous and smooth transient performance during the switching process, the purpose of this invention is to propose a micro-grid multi-objective based on non-disturbance switching The optimal control method of operation, aiming at the system structure and control objectives of different operating modes of the microgrid, and using the non-disturbance switching control method to design a non-disturbance compensation controller to realize the non-disturbance switching between the microgrid grid-connected operation and the island operation mode, Ensure continuous and smooth transient performance during switching, solve the problem of stable multi-mode operation of the microgrid, and design a disturbance-free switching compensation controller to achieve continuity and coordination of multiple controllers during mode switching, and improve switching efficiency Transient performance, truly seamless and smooth switching between modes

Method used

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  • Undisturbed switching-based multi-target running optimal control method of microgrid
  • Undisturbed switching-based multi-target running optimal control method of microgrid
  • Undisturbed switching-based multi-target running optimal control method of microgrid

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Embodiment 1

[0107] Switch from the island operation mode to the grid-connected operation mode, in this case, the sleep mode is the grid-connected operation mode, and the active mode is the island operation mode, the steps are as follows:

[0108]Step 1: First consider a general switched system model with two modes, and give a method for designing a mode-dependent bumpless switching compensation controller. Based on the optimal control theory of linear quadratic form, the design problem of mode-dependent disturbance-free compensation controller is transformed into the optimal control problem of linear quadratic form.

[0109] For a switching system operating in multiple modes, each operating mode has its own controller. For subsystem i, the state equation of the controller is as follows:

[0110]

[0111] where x(t)∈R n is the state vector of controller i, y(t)∈R q is the output of the controlled object, r∈R p is the reference signal to be tracked. A i B i C i D. i is the sys...

Embodiment 2

[0184] Switch from grid-connected operation mode to island operation mode

[0185] In this case, the sleep mode is the island operation mode and the active mode is the grid operation mode

[0186] This embodiment includes the following steps:

[0187] Step 1: First consider a general switched system model with two modes, and give a method for designing a mode-dependent bumpless switching compensation controller. Based on the optimal control theory of linear quadratic form, the design problem of mode-dependent disturbance-free compensation controller is transformed into the optimal control problem of linear quadratic form.

[0188] For a switching system operating in multiple modes, each operating mode has its own controller. For subsystem i, the state equation of the controller is as follows:

[0189]

[0190] where x(t)∈R n is the state vector of controller i, y(t)∈R q is the output of the controlled object, r∈R p is the reference signal to be tracked. A i B i C ...

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Abstract

An undisturbed switching-based multi-target running optimal control method of a microgrid comprises the steps of 1, allowing each running mode to have respective controller with regard to a multi-moderunning switching system; 2, seeking admissible control Alpha <*> (t), and allowing a performance index function (3) to take minimum value according to an optimal control theory; 3, considering a control target of an island running mode as simultaneous average power for suppressing circulation; and 4, considering a running target of the microgrid under a grid-connected running mode, and designinga corresponding mode controller and an undisturbed switching compensation controller during switching from the island running mode to the grid-connected running mode. With the undisturbed switching compensation controller designed by the invention, the stability of the system and smooth and continuous transient-state performance can be ensured.

Description

technical field [0001] The invention relates to the technical fields of power electronics, communication and control, in particular to an optimal control method for multi-objective operation of a microgrid based on non-disturbance switching. Background technique [0002] As a new technology, Microgrid can absorb more renewable energy, and can combine the flexibility of power electronic devices, advanced control technology and network technology to form a more efficient and green power generation method. One of the key technologies to solve energy and environmental problems in the next century is a key node to realize the energy Internet. The development of micro-grid technology is of great significance to my country's adjustment of energy structure, environmental protection, rural energy consumption and remote area power consumption, ecological construction, and the transition from traditional grid to smart grid. In the 2017 "Planning" press conference, the National Energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/382H02J3/388H02J2203/20
Inventor 吴莹吴彦鹏
Owner XI'AN PETROLEUM UNIVERSITY
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