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Control system of cascaded high-voltage inverter and method thereof

A high-voltage frequency converter and control system technology, which is applied to the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc. The effect of high security and hardware reliability

Active Publication Date: 2012-09-26
GUODIAN NANJING AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the method of using a timing chip, these two methods have achieved the goal of reducing the number of chips and the board area, but still cannot solve the problem of system shutdown when the DSP fails
And when CPLD is used, limited by the number of logic units, generally three or more CPLD chips are required

Method used

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  • Control system of cascaded high-voltage inverter and method thereof
  • Control system of cascaded high-voltage inverter and method thereof
  • Control system of cascaded high-voltage inverter and method thereof

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the drawings and specific embodiments:

[0037] Such as figure 1 The control system of the cascaded high-voltage frequency converter of the present invention shown includes a digital signal processor (DSP) and a field programmable gate array (FPGA). The interface between the two is as figure 1 Shown.

[0038] The process of generating the PWM control pulse in the present invention is as follows:

[0039] 1) After the system is powered on, it is first initialized. The digital signal processor (DSP) obtains the target frequency, the starting frequency and the frequency up and down curves; the programmable gate array (FPGA) initializes its triangular wave generator and sets the initial triangular carrier of each channel Phase and amplitude.

[0040] 2) The digital signal processor (DSP) is responsible for the realization of the control algorithm, calculates the required three-phase modulation wave signal Mx ...

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Abstract

The invention discloses a control system of a cascaded inverter, which comprises a cascaded voltage source inverter and a plurality of power units arranged in the cascaded voltage source inverter. The control system is characterized in that each power unit is respectively connected with a field programmable gate array through control fiber, and the field programmable gate array is connected with a main control CPU. Since the field programmable gate array is used as a PWM control pulse generator, and the design adopts the software programming method, compared with the conventional method, the invention has the advantages of low cost, short development cycle and high hardware reliability.

Description

Technical field [0001] The invention relates to a cascade inverter control system and method, in particular to a cascade inverter control system and method with memory output function and backup fault processing function, belonging to the field of medium and high voltage motor frequency conversion speed regulation devices . Background technique [0002] The cascaded high-voltage inverter has become an important product in the field of high-voltage inverters. Because of its low input and output waveform harmonic content and its modular design, it has been widely used in high-voltage and high-power speed regulation applications. However, on the one hand, due to its numerous power modules, its control system is more complicated; on the other hand, cascaded high-voltage inverters are mostly used in driving situations of important equipment, and the reliability of its control system is relatively high. [0003] The cascaded high-voltage inverter uses the power unit series connection me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537
Inventor 霍利杰李冰胡炫张俊成钱诗宝
Owner GUODIAN NANJING AUTOMATION