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Counter control current tracking control method based on average current compensation

A technology of average current and current tracking, applied in the direction of converting AC power input to DC power output, irreversible DC power input converting to AC power output, electrical components, etc. Signal compensation, inability to achieve precise control, etc.

Inactive Publication Date: 2008-08-20
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantages: Since the continuous model cannot reflect the actual working conditions, the control law derived after discretization cannot achieve precise control; directly sample and control the instantaneous current, which will cause the resonance or spike signal caused by the commutation of the switching element brought into the control, causing system instability; without any compensation for the measurement signal, the impact on the control is greater when the reference signal changes suddenly; the input filter is required to filter out high-order harmonics, but it is not considered in the modeling, which will cause The system is unstable; it has inherent calculation delay, which will affect the dynamic response speed and compensation accuracy, and the tracking error of sudden signal is large

Method used

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  • Counter control current tracking control method based on average current compensation
  • Counter control current tracking control method based on average current compensation
  • Counter control current tracking control method based on average current compensation

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Embodiment Construction

[0033] Provide following embodiment in conjunction with content of the present invention:

[0034] Such as figure 1 As shown, S1-S4 are full-control switches connected to form a single-phase full bridge, and the switches are connected with resistance-capacitance absorption circuits and anti-parallel diodes, i c is the device output current, u dc is the DC side capacitor voltage, u s is the AC power supply voltage, L is the reactor connected to the power grid, and the load is a commonly used thyristor rectifier load. use as figure 2 For the triangular wave carrier shown, the full-control switches S1 and S4 are turned on at T-td / 2, and turned off at T+td / 2, while the full-control switches S2 and S3 are opposite. The principle of the available inverse control current tracking method based on average current compensation is as follows: image 3 shown. image 3 in, i ref is a given arbitrary waveform reference signal; The amount of feedback employed for the present invent...

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Abstract

This invention is an athwart control current tracking control method based on average current compensation. The processes are as follows: 1) the measuring signal is output through reseting integrating device; 2) found device average current mode; 3) calculate reactive amount i(KT); 4) athwart estimate the control law based on instantaneous current relation, get the break over time of the control switch; 5) compare the space-taking of invariableness frequency triangle wave and the output of the controller to get open of the driving and controlling switch and PWM pulse of the output. This invention wipes off the influences of resonance and aiguille signal caused by current changing of the switching components, and it does not need input filter and reduces the influences of the changing measuring signal. Because this invention adopts the compensation, so when the referential signal changes abruptly, it also can track.

Description

technical field [0001] The invention relates to a current tracking control method, in particular, an inverse control current tracking control method based on average current compensation. The invention belongs to the technical field of current tracking control. Background technique [0002] For the problem of current tracking control, the commonly used methods at home and abroad are: linear current control (Linear Current Control) method, hysteresis current control (Hysteresis current control) method. Among them, the linear current control method has a large error in tracking high-order harmonics; the modulation frequency of the hysteresis current control method is not fixed, and the switching frequency of the power conversion device is high, which is not only difficult to design the input filter, but also easily causes grid oscillation. It is also not conducive to fast transient control. [0003] After searching the prior art documents, it was found that K.Nishida, M.Ruko...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/5387
Inventor 周荔丹曼苏乐陈陈
Owner SHANGHAI JIAOTONG UNIV
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