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Method for controlling three-phase converter

A three-phase converter and control method technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. , to achieve the effect of simple algorithm, easy implementation and superior performance

Inactive Publication Date: 2013-02-13
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional control methods, most of them need decoupling, park transformation and PI parameter setting, etc. The methods are relatively complicated, and due to the influence of control cycle and operation delay, there will be control lag, so the effect cannot be optimal.

Method used

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  • Method for controlling three-phase converter

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Embodiment Construction

[0035] The working principle of the present invention

[0036] The present invention uses two voltage sensors to measure the grid-side voltage, two current sensors to measure the grid-side current, and one voltage sensor to measure the DC-side voltage. The measurement signal enters the DSP through AD conversion, and the three-phase control signal is output to control the three-phase The switching tube achieves the purpose of controlling the grid side current. The entire control process is divided into two aspects: the outer loop and the inner loop.

[0037] In terms of the outer loop of the system, due to the influence of the control period and operation delay, there must be a certain hysteresis, that is, the control effect lags behind the expected effect t D time. Because the traditional control method does not compensate for this hysteresis, the grid-side voltage and grid-side current will have a certain phase shift. To solve this problem, the present invention adds a com...

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Abstract

The invention relates to a method for controlling a three-phase converter. The method provided by the invention comprises the following steps: firstly, determining the input voltage of the three-phase network side after the retardation time tD; then, determining the command output voltage of the three-phase network side, and determining the sector S with the command output voltage of the network side; determining the vector execution time Ti and Tj of adjacent switches; and finally, determining three-phase modulating signals ma, mb and mc, thereby obtaining switch control signals by comparing triangular carrier waves with the three-phase modulating signals ma, mb and mc. The invention has the advantages that (1) the control retardation caused by operation delay and period control is compensated by a prediction link in the formula 1; (2) the command output voltage of the network side is calculated by utilizing the formula 2, and the links of park conversion, decoupling and PI regulation are not needed, thereby simplifying the debugging and programming processes; and (3) the novel space vector synthesis methods in the formula 1, the formula 2 and the formula 3 are combined, and the angle calculation is not needed, thereby enhancing the rapidity and real-time properties of processing.

Description

technical field [0001] The invention belongs to a three-phase voltage converter, which functions as rectification and inverter, and can be used in the fields of frequency converter, reactive power compensator, active filter, grid-connected power generation and the like. Background technique [0002] Today's converters mainly adopt double-loop control, that is, the inner loop adopts current control, and the outer loop adopts PI regulator, in order to improve the power factor of the grid side and reduce the switching frequency while rectifying and inverting. In the traditional control methods, most of them need decoupling, park transformation and PI parameter setting, etc. The methods are relatively complicated, and due to the influence of control cycle and operation delay, there will be control lag, so the effect cannot be optimal. Contents of the invention [0003] The object of the present invention is to overcome the above-mentioned shortcomings in the prior art and prov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
Inventor 魏克新杜吉飞
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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