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A Linearized Control Method of Electric Spring Feedback 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 affecting control performance, narrow stability domain, complicated controller design, etc., to achieve good dynamic performance, The effect of wide stability domain, enhanced stability performance and robust performance

Active Publication Date: 2022-05-27
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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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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  • A Linearized Control Method of Electric Spring Feedback Based on Robust Disturbance Observation
  • A Linearized Control Method of Electric Spring Feedback Based on Robust Disturbance Observation
  • A Linearized Control Method of Electric Spring Feedback 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] Among them, 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 t...

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 feedback linearization control method of an electric spring based on robust disturbance observation, comprising: establishing an AC electric spring two-input / two-output Lie derivative affine model according to a dynamic mathematical model of an AC electric spring in a dq rotating coordinate system; constructing The decoupling matrix and the state transformation matrix are combined with the coupling model and the nonlinear model to observe respectively, and the fully decoupled and fully linearized AC power spring is obtained; the power loop PI controller is constructed; and the robust disturbance observer is established. The invention realizes the complete decoupling and complete linearization design of the AC power spring, has the characteristics of good dynamic performance and wide stable domain, proposes a robust disturbance observer design, and enhances the performance of the closed-loop control system in the case of uncertain disturbances Stable performance and robust performance.

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 Patents(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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