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Direct gain control method and system for front-end AC/DC rectifier of bidirectional charger

A gain control and gain controller technology, which is applied in the direction of irreversible AC power input conversion to DC power output, electrical components, output power conversion devices, etc., can solve the problem of inability to guarantee the safe and stable operation of bidirectional chargers and controller parameter adjustments The process is cumbersome, it is difficult to meet the problems of frequent load switching, etc., to achieve the effect of convenient parameter setting, easy promotion and application, and good real-time performance

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

AI Technical Summary

Problems solved by technology

[0004] However, as a direct connection device between the power grid and electric vehicles, it will be affected by complex power grid conditions such as imbalance and harmonics, and will also be disturbed by the charging characteristics of power battery loads with different characteristics
Conventional proportional-integral control (PI) methods are mostly based on linearized small-signal models, which cannot guarantee the safe and stable operation of bidirectional chargers under such complex working conditions
In addition, the inventors found that most of the existing three-phase PWM rectifier control schemes use a double closed-loop cascaded structure with a voltage outer loop and a current / power inner loop. The controller parameter adjustment process is cumbersome, and it is difficult to meet the working conditions of frequent load switching

Method used

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  • Direct gain control method and system for front-end AC/DC rectifier of bidirectional charger
  • Direct gain control method and system for front-end AC/DC rectifier of bidirectional charger
  • Direct gain control method and system for front-end AC/DC rectifier of bidirectional charger

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Embodiment 1

[0031] refer to figure 1 , a direct gain control method for a front-end AC / DC rectifier of a bidirectional charger according to this embodiment, comprising:

[0032] Step S101: Obtain the load current of the PWM rectifier.

[0033] For example: The load current of the PWM rectifier is detected by the sensor.

[0034] According to the working principle of the three-phase PWM rectifier, the dynamic mathematical model of the PWM rectifier in this embodiment is:

[0035]

[0036] 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 equivalent resistance, R L is the load resistance. P and Q are the active power and reactive power of the PWM rectifier respectively, according to the instantaneous power theory

[0037]

[0038] where i α ,i β is the grid current in the two-phase statio...

Embodiment 2

[0069] This embodiment provides a direct gain controller oriented to the AC / DC rectifier at the front end of a bidirectional charger, which includes a memory storing a computer program. When the program is executed, the direct gain controller implements the above-mentioned first embodiment. Steps in the direct gain control method for the front-end AC / DC rectifier of the bidirectional charger described above.

Embodiment 3

[0071] This embodiment provides a direct gain control system for a front-end AC / DC rectifier of a bidirectional charger, which includes the direct gain controller for a front-end AC / DC rectifier of a bidirectional charger as described in Embodiment 2 above.

[0072] Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) having computer-usable program code embodied therein.

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Abstract

The invention belongs to the technical field of power electronic control, and provides a direct gain control method and system for a front-end AC / DC rectifier of a bidirectional charger. The method comprises the following steps that: the load current of a PWM rectifier is obtained; the load current is fed forward to state transformation containing a first to-be-designed gain parameter, wherein the relationship between transformed parameters and state variables of the PWM rectifier is constructed in the state transformation; the state variables of the PWM rectifier comprise a square value of a direct-current voltage, reactive power and active power; the parameters subjected to state transformation are controlled by a single-loop direct gain rule containing a second to-be-designed gain parameter, and modulation voltage under a two-phase static coordinate system is output to modulate the PWM rectifier, wherein the single-loop direct gain law comprises a direct-current voltage control law and a reactive power control law; the first to-be-designed gain parameter is larger than a result represented by an expression described in the specification, in the expression, C is direct current side capacitance, RL is load resistance, M is a positive definite Lyapunov weighting matrix, and n0 is any normal number; and the second to-be-designed gain parameter is greater than 0.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, and in particular relates to a direct gain control method and system for a front-end AC / DC 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] Traditional unidirectional chargers have defects such as single energy flow direction, low input power factor, and large current distortion, which have become the main bottleneck restricting the development of electric vehicles. The three-phase PWM rectifier has a simple structure. It can not only absorb energy from the power grid to supply the power battery, but also feed back the energy stored in the power battery to the power grid. It is the first choice for the front-end AC / DC rectifier of the bidirectional charger for electric vehicles. [0004] However, as a direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/04H02M1/08
CPCH02M7/04H02M1/08
Inventor 张承慧付程张关关段彬张宪福
Owner SHANDONG UNIV
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