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Power spring feedback linearization control method based on robust disturbance observation

A feedback linearization, power spring technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of complex controller design, narrow stability domain, affecting control performance, etc.

Active Publication Date: 2021-02-05
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the AC power spring has typical strong coupling and nonlinear characteristics, while the traditional vector decoupling control relies on the local linearization of the model, combined with the PI controller to realize the dynamic adjustment of the AC power spring, there are still some couplings in the system that affect the control performance, and The stability domain is narrow, and the controller design is more complicated

Method used

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  • Power spring feedback linearization control method based on robust disturbance observation
  • Power spring feedback linearization control method based on robust disturbance observation
  • Power spring feedback linearization control method based on robust disturbance observation

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Embodiment 1

[0064] refer to Figure 1~3 , as an embodiment of the present invention, provides a linearized control method for electric spring feedback based on robust disturbance observation, including:

[0065] S1: Establish the two-input / two-output Lie derivative affine model of the AC electric spring according to the dynamic mathematical model of the AC electric spring in the dq rotating coordinate system;

[0066] It should be noted that the dynamic mathematical model of the electric spring includes,

[0067]

[0068] in,

[0069] A 1 =Z C / L G (Z C +Z NC )

[0070] A 2 =(R G Z C +Z C Z NC +R G Z NC ) / L G (Z C +Z NC )

[0071] A 3 =1 / L G

[0072] where i d , i q respectively represent the d and q components of the AC bus current i, v ES,d , v ES,q Respectively represent the AC power spring output voltage v ES The d, q components of v G,d , v G,q Respectively represent the AC microgrid power supply voltage v G The d, q components of , ω represents the sy...

Embodiment 2

[0125] refer to Figure 4-8 , is the second embodiment of the present invention. In order to verify the effectiveness of the present invention, a simulation is performed based on the MATLAB platform. The simulation system parameters are shown in Table 1; the AC microgrid power supply voltage v is set G It consists of a stable AC power source and renewable power sources such as wind power generation and photovoltaic power generation, and is used to simulate the source-side active power fluctuation caused by high-permeability renewable energy generation; set the active power reference value P of the power outer ring in,ref =60W, reactive power reference value Q in,ref = 0var.

[0126] Table 1: Simulation system parameter table.

[0127]

[0128] Set the output active power P of the AC microgrid power supply G A sudden change occurs every 0.25s, that is, the source side active power P at t=0.25s G From 60.4W to 66.6W, when t=0.5s, the source side active power P G The sudd...

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Abstract

The invention discloses a power spring feedback linearization control method based on robust disturbance observation. The method comprises the steps of establishing an alternating-current power springtwo-input / two-output Lie derivative affine model according to an alternating-current power spring dynamic mathematical model under a dq rotating coordinate system; constructing a decoupling matrix and a state transformation matrix, and conducting observation through a coupling model and a nonlinear model to obtain an alternating-current power spring achieving complete decoupling and complete linearization conversion; constructing a power loop PI controller; and establishing a robust disturbance observer. Complete decoupling and complete linearization design of the alternating-current power spring are achieved, the method has the advantages of being good in dynamic performance and wide in stability domain, the robust disturbance observer design is provided, and the stability performance and the robustness performance of a closed-loop control system under the uncertain disturbance condition are enhanced.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to an electric spring feedback linearization control method based on robust disturbance observation. Background technique [0002] With the popularization and application of high-penetration renewable power generation, renewable energy such as wind energy and solar energy will be connected to the AC microgrid on a large scale, but the intermittent and random nature of renewable energy Power quality problems such as power harmonics significantly affect the power quality at the user side. As a new demand-side management technology, the AC power spring has a simple structure and is suitable for a variety of application scenarios. It can effectively suppress the active power fluctuation of the AC microgrid caused by high-penetration renewable energy generation, and improve the power quality of the user side. [0003] However, the AC power spring has typical s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 薛花王育飞钦佳南张晓雯凌晨张宇华于艾清
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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