Direct power control method of three-phase PWM rectifier

A power control and rectifier technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve problems such as system control performance cannot be guaranteed, and achieve the effect of improving robustness

Active Publication Date: 2019-11-15
HUAIYIN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

However, the existing Backstepping controller design does not consider the influence of system uncertainties. When system parameters change and external disturbances occur, the control performance of the system cannot be guaranteed.

Method used

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  • Direct power control method of three-phase PWM rectifier
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  • Direct power control method of three-phase PWM rectifier

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0060] refer to figure 1 The main circuit structure diagram of the three-phase PWM rectifier is shown, in which the inductance L represents the grid-side filter, and its equivalent resistance is r L ,T 1 ~T 6 Indicates six switching devices, D 1 ~D 6 is a diode connected in antiparallel with the six switching devices, C is the DC output filter capacitor, R L is the load; i is the DC output current, i C is the current on the filter capacitor at the DC output terminal, i O for the load R L on the current.

[0061] refer to figure 2 The neural network adaptive Backstepping three-phase PWM rectifier direct power control system provided in this embodiment includes two independent adaptive ...

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Abstract

The invention discloses a direct power control method of a three-phase PWM rectifier. According to the three-phase current and three-phase voltage of the network side of the three-phase PWM rectifier,the instantaneous active power and the instantaneous reactive power of the three-phase PWM rectifier are calculated to construct the average state space model of the three-phase PWM rectifier. A decoupling control signal is introduced into the average state space model of the three-phase PWM rectifier. Uncertain terms in the system are taken into account. A reactive power neural network adaptiveBackstepping controller and a neural network adaptive Backstepping controller of direct current output voltage are designed. Related parameters are input into the reactive power neural network adaptive Backstepping controller and the neural network adaptive Backstepping controller of direct current output voltage to acquire the corresponding output control rate. Coupling transformation is carriedout on the output control rate. The switching control signal of the three-phase PWM rectifier is acquired according to the SVPWM model. The control method provided by the invention has the advantagesof small calculation amount, simple parameter adjustment and good robustness.

Description

technical field [0001] The invention relates to a direct power control method of a three-phase PWM rectifier, which belongs to the technical field of power electronics. Background technique [0002] Three-phase PWM rectifiers are widely used in traditional industries and emerging industries, such as smart microgrids. Generally, in wind power generation, a PWM rectifier realizes AC / DC power conversion while regulating the rotational speed of the generator. Another important application field is as an interface circuit between electric vehicles and the grid. As an energy storage device, electric vehicles can absorb electric energy from the grid, and at the same time can use V2G technology to feed electric energy to the grid. In addition, PWM rectifiers are also widely used in static var compensators (SVG), active power filters (APF), and unified power flow controllers (UPFC), etc. [0003] The control of PWM rectifiers is divided into two categories, one of which is based on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/2173
Inventor 杨艳王业琴吴婷婷郭畅夏奥运刘璐邵友成李子昕陈煜洋
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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