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High-disturbance-rejection backstepping control method and system for front-end rectifier of bidirectional charger

A technology of backstepping control and rectifier, applied in the direction of electrical components, circuit devices, battery circuit devices, etc., can solve the problems of system control performance degradation, inconsistent load characteristics, large power variation range, etc., and achieve fast DC voltage and power tracking control , good anti-interference ability and robustness, the effect of less difficulty in parameter setting

Active Publication Date: 2021-06-15
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors found that the traditional backstepping control method relies heavily on the mathematical model of the system, and when the rectifier parameters are uncertain or subject to external disturbances, the system control performance will decline
In particular, the load of the bidirectional charger is a power battery, the load characteristics are inconsistent and the power variation range is large, that is, the system load disturbance is large, which is likely to cause the DC voltage of the charger to drop or suddenly increase, deteriorating the charging performance, and even causing the bidirectional charging system to fail to operate normally.

Method used

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  • High-disturbance-rejection backstepping control method and system for front-end rectifier of bidirectional charger
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  • High-disturbance-rejection backstepping control method and system for front-end rectifier of bidirectional charger

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Embodiment 1

[0049] In order to improve the robustness of the rectifier control system and solve the problem of DC side voltage drop or sudden increase in the rectifier backstep control when the load power changes, such as figure 1 As shown, this embodiment provides a high anti-disturbance backstepping control method for the front-end rectifier of a bidirectional charger, which specifically includes the following steps:

[0050] Step 1: Construct the dynamic mathematical model of the front-end rectifier of the bidirectional charger under the disturbance.

[0051] According to the working principle of the three-phase PWM rectifier, the dynamic mathematical model of the rectifier under disturbance is established as

[0052]

[0053] in

[0054] V dc is the measured value of DC voltage, u α ,u β is the grid voltage in the two-phase static coordinate system, ω is the angular frequency of the three-phase voltage, C is the DC side capacitance, L is the filter inductance, R is the line e...

Embodiment 2

[0088] This embodiment provides a high anti-disturbance backstepping control system for the front-end rectifier of a bidirectional charger, which includes:

[0089] a disturbance observer, which is used to obtain an estimated value of the equivalent disturbance in the dynamic model of the rectifier, and is input as the disturbance estimated value of the backstepping control law;

[0090] The backstepping controller is used to obtain the three-phase grid voltage, grid current and DC voltage of the rectifier based on the dynamic mathematical model of the front-end rectifier of the bidirectional charger under disturbance, calculate active power and reactive power, and combine DC voltage reference value and reactive power Then, based on the stability of the rectifier closed-loop system, the parameters of the backstepping control law and the disturbance observer are solved to realize the backstepping control of the front-end rectifier of the bidirectional charger.

[0091] In the s...

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Abstract

The invention belongs to the field of rectifier control, and provides a high-disturbance-rejection backstepping control method and system for a front-end rectifier of a bidirectional charger. The high-disturbance-rejection backstepping control method for the front-end rectifier of the bidirectional charger comprises the following steps of: constructing a dynamic mathematical model of the front-end rectifier of the bidirectional charger under disturbance; acquiring three-phase power grid voltage, power grid current and rectifier direct-current voltage, calculating active power and reactive power, and designing a backstepping control law with a disturbance estimation value on the basis of a direct-current voltage reference value and a reactive power reference value; constructing a disturbance observer to obtain an estimation value of equivalent disturbance in a rectifier dynamic model, and inputting the estimation value as a disturbance estimation value of the backstepping control law; and based on the stability of a rectifier closed-loop system, solving the backstepping control law and the parameters of the disturbance observer so as to realize backstepping control of the front-end rectifier of the bidirectional charger.

Description

technical field [0001] The invention belongs to the field of rectifier control, and in particular relates to a high anti-disturbance backstepping control method and system for a front-end rectifier of a bidirectional charger. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The three-phase PWM rectifier has the advantages of bidirectional flow of energy and adjustable input power factor, and is the first choice for the front-end rectifier of the bidirectional charger of electric vehicles. The conventional rectifier scheme is mainly based on the proportional integral control of the linearized model. Although the structure is simple, parameter tuning is difficult, and the system stability of the rectifier in a wide range cannot be guaranteed. Backstepping control is a kind of nonlinear control method with simple control law structure and goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/72H02M1/08H02M1/44
CPCH02J7/06H02J7/00712H02M7/72H02M1/08H02M1/44H02J2207/20Y02T10/70
Inventor 张承慧付程张关关段彬
Owner SHANDONG UNIV
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