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Alternating-current power spring feedback linearization decoupling control method

A technology of feedback linearization and electric springs, which is applied in the direction of AC network circuit, AC network voltage adjustment, power network operating system integration, etc., can solve the problem of difficult to achieve precise control of wide-range power, not wide stable domain, and increased power controller design issues of complexity

Pending Publication Date: 2021-03-02
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a new demand-side management technology, AC power spring can effectively suppress the active power fluctuation of AC microgrid caused by high-permeability renewable energy generation; however, AC power spring is a typical strong coupling and nonlinear object, and the traditional vector solution Coupling 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 is still a part of the coupling in the system that affects the control performance, which increases the complexity of the power controller design, and the stability domain is not wide, making it difficult to achieve a wide range Precise control of power

Method used

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  • Alternating-current power spring feedback linearization decoupling control method
  • Alternating-current power spring feedback linearization decoupling control method
  • Alternating-current power spring feedback linearization decoupling control method

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Embodiment 1

[0052] refer to Figure 1 ~ Figure 3 , which is the first embodiment of the present invention, this embodiment provides an AC electric spring feedback linearization decoupling control method, including:

[0053] S1: According to the AC microgrid structure with AC power springs, construct the dynamic model of AC power springs in the dq rotating coordinate system.

[0054] According to the AC microgrid structure with AC power springs, such as figure 1 , and according to KCL (Kirchhoff's Current Law, Kirchhoff's current law), KVL (Kirchhoff Voltage Laws, Kirchhoff's voltage law), define the dynamic mathematical model of the AC electric spring in the dq rotating coordinate system:

[0055]

[0056] Among them, the coefficient matrix A 1 = Z C / L G (Z C +Z NC ), A 2 =(R G Z C +Z C Z NC +R G Z NC ) / L G (Z C +Z NC ), A 3 =1 / L G , i d i q are the d and q components of the AC bus current i, v ES,d , v ES,q Respectively, the AC power spring output voltage v ES ...

Embodiment 2

[0094] In order to verify and explain the technical effect adopted in this method, this embodiment chooses the vector decoupling control (vector decoupling control, VDC) method and adopts this method to carry out comparative tests, and compares the test results by means of scientific demonstration to verify the results of this method. have real effects.

[0095] The dynamic performance and stability of the vector decoupling control method are poor.

[0096] In order to verify that this method has a shorter adjustment time and better stability than the vector decoupling control method, in this embodiment, the vector decoupling control method and this method will be used to measure and compare the control performance of the AC electric spring.

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Abstract

The invention discloses an alternating-current power spring feedback linearization decoupling control method which comprises the following steps: constructing an alternating-current power spring dynamic model under a dq rotating coordinate system according to an alternating-current microgrid structure containing an alternating-current power spring; constructing two-input and two-output plum derivative affine models of the alternating-current power spring according to the dynamic model of the alternating-current power spring; constructing a decoupling matrix and a state transformation matrix incombination with the plum derivative affine model, and solving a feedback linearization control law; and constructing a power loop PI controller, and dynamically adjusting the AC power spring in combination with the AC power spring dynamic model. Aiming at strong coupling and non-linear characteristics of the AC power spring, complete decoupling and complete linear control of the AC power springare realized, the design of the power controller is simplified, and the power controller has the characteristics of good dynamic performance and wide stability domain.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to an AC power spring feedback linearization decoupling control method. Background technique [0002] With the promotion and application of green power, renewable energy such as wind energy and solar energy will be connected to the AC microgrid on a large scale. Harmonics and other power quality problems. [0003] As a new demand-side management technology, AC power spring can effectively suppress the active power fluctuation of AC microgrid caused by high-permeability renewable energy generation; however, AC power spring is a typical strong coupling and nonlinear object, and the traditional vector solution Coupling 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 is still a part of the coupling in the system that affects the control performance, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/14G06F30/18G06F30/30
CPCH02J3/144G06F30/18G06F30/30G06F2111/02G06F2113/04H02J2203/20Y04S20/222Y02B70/3225
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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