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Micro-grid frequency modulation method with electric automobile based on MPC and PI control method

A technology of electric vehicles and control methods, which is applied in the direction of control/regulation systems, adaptive control, general control systems, etc., and can solve problems such as MPC problems that cannot be controlled

Active Publication Date: 2015-09-23
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Another purpose of the present invention is to solve the technical problems existing in the prior art; Provide a kind of adaptability that overcomes PI controller to operating conditions, and dynamic performance also obtains positive improvement; Can effectively avoid MPC problem when solving unfeasible The problem of being unable to control, at this time the whole system can still operate effectively, and the reliability of the control method is strengthened. The micro-grid frequency modulation method with electric vehicles based on MPC and PI control methods

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  • Micro-grid frequency modulation method with electric automobile based on MPC and PI control method
  • Micro-grid frequency modulation method with electric automobile based on MPC and PI control method
  • Micro-grid frequency modulation method with electric automobile based on MPC and PI control method

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Embodiment

[0074] The present invention is as image 3 The microgrid system system shown has implemented a microgrid frequency modulation method with electric vehicles based on GPC and PI control methods. image 3 The state space model of the microgrid system is as follows:

[0075] x · ( t ) = A c x ( t ) + B c u u ( t ) + B c d d ( t ) y c ( t ) = C c x ( t ) (1)

[0076] Where x=[Δf ΔP MT ΔX MT ΔP E1 ΔP E2 ] T , U=[Δu MT Δu E1 Δu E2 ] T , W=[ΔP D ] T , Y=[Δf] T .

[0077] A = 0 1 H t 0 1 H t 1 H t 0 - 1 T t 1 T t 0 0 - 1 RT f 0 - 1 T f 0 0 0 0 0 - 1 T e 1 0 0 0 0 0 - 1 T e 2 , B = 0 0 1 T f 0 0 0 0 0 ...

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Abstract

The invention adopts a micro-grid frequency modulation method with an electric automobile based on an MPC and PI control method. The characteristic that an electric automobile-mounted battery acts as an energy storage device is fully utilized, and the electric automobile participates in micro-grid frequency modulation to compensate the insufficiency of load frequency control in isolated micro-grid operation under the support of an electric automobile access network technology (V2G). In the scheme, state quantity of the system of the current moment is obtained via a state observer firstly in each control cycle. An optimal control input variable and a corresponding prediction state quantity are solved by adopting an MPC controller, and the solving results are used for optimizing parameters in a PI controller, i.e. proportional and integral parameters are set again. Finally, the PI controller of which the control parameters are optimized is adopted to realize modulation control of micro-grid frequency until arrival of the next control cycle. A better control effect can be realized, and the method has global robust performance and relatively high reliability.

Description

Technical field [0001] The invention relates to the field of power system frequency adjustment and control, in particular to a microgrid frequency modulation control strategy with electric vehicles based on MPC and PI control methods Background technique [0002] Microgrid is a new energy system model that integrates local renewable energy power generation systems, clean energy power generation systems, energy storage devices, and various loads. It is receiving more and more attention. The microgrid system can operate in both grid-connected and off-grid modes. When the microgrid is operating in an isolated state off-grid, it must have its own frequency control strategy to ensure that the microgrid can continue to operate normally and is reconnected to the grid. Make preparations. When the microgrid is operating in an isolated state, the frequency control when the power is unbalanced and the distribution of unbalanced power become the focus of research, because the micro sources ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 杨军龚凌云王新普冯欣李忠民
Owner WUHAN UNIV
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