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A Deadbeat Grid-connected Control Method Based on Interpolation Prediction and Inductance Compensation

A control method and deadbeat technology, applied in electrical components, single-network parallel feeding arrangements, output power conversion devices, etc., can solve problems such as delay inductance, deviation, etc., to improve accuracy and solve delay and the effect of inductance deviation, optimized harmonic content and power factor

Active Publication Date: 2022-05-10
DONGGUAN LARGE ELECTRONICS CO LTD
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Problems solved by technology

[0005] The present invention provides a dead-beat grid-connected control method based on interpolation prediction and inductance compensation in view of the problems in the prior art. The functions of interpolation prediction and inductance compensation are added to the traditional dead-beat grid-connected control method to solve the grid-connection process In order to improve the accuracy of the deadbeat grid-connected control algorithm for the duty ratio control of the switching tubes of the full-bridge inverter circuit

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  • A Deadbeat Grid-connected Control Method Based on Interpolation Prediction and Inductance Compensation
  • A Deadbeat Grid-connected Control Method Based on Interpolation Prediction and Inductance Compensation
  • A Deadbeat Grid-connected Control Method Based on Interpolation Prediction and Inductance Compensation

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[0039] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] A deadbeat grid-connected control method based on interpolation prediction and inductance compensation provided in this embodiment includes the following steps

[0041] A. Establish the mathematical model of the full-bridge inverter circuit;

[0042] B. Perform AD sampling at the peak of the PWM drive carrier of the full-bridge inverter circuit, and then obtain the grid voltage U by introducing the Newton interpolation prediction algorithm of bit operation T (n) and the peak grid output current I T (n);

[0043] C. According to the discrete state equation of the full-bridge invert...

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Abstract

The present invention relates to the technical field of inverter grid-connected control, in particular to a deadbeat grid-connected control method based on interpolation prediction and inductance compensation, through the introduction of the Newton interpolation prediction algorithm for bit operation processing in deadbeat grid-connected control Compensate for the time delay problem, and correct the inductance deviation problem in the dead-beat grid-connected control through the online inductance identification algorithm based on frequency-doubling sampling, solve the delay and inductance deviation problems in the grid-connecting process, and improve the error-free The grid-connected control algorithm controls the accuracy of the duty cycle of the switching tube of the full-bridge inverter circuit, and then optimizes the harmonic content and power factor of the output current of the full-bridge inverter circuit.

Description

technical field [0001] The invention relates to the technical field of inverter grid-connected control, in particular to a dead-beat grid-connected control method based on interpolation prediction and inductance compensation. Background technique [0002] Commonly used full-bridge inverter control algorithms include dual-PI closed-loop control, PR control, repetitive control, and deadbeat control. Among them, dual-PI closed-loop control is the most common full-bridge grid-connected control method, and its voltage outer loop and current inner loop are both Using PI control has the advantages of simple control, easy implementation, and high reliability, but the traditional PI control is difficult to achieve the ideal tracking control effect on the sinusoidal reference current, and there are steady-state amplitude errors and phase errors in the grid-connected current. The interference capability is limited; while the deadbeat algorithm obtains the control signal required to be ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/5387H02M7/5395
Inventor 薛家祥林壮彬朱亮华晋刚曾敏
Owner DONGGUAN LARGE ELECTRONICS CO LTD
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