Control method of cascaded type frequency converter based on DSP and FPGA

A control method and frequency converter technology, applied in control systems, AC motor control, electrical components, etc., can solve problems such as unsatisfactory control effects and inability to guarantee real-time control, and achieve easy implementation, compact structure, and high real-time performance Effect

Inactive Publication Date: 2015-04-29
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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Problems solved by technology

[0003] The existing motor frequency conversion speed regulation generally uses DSP to control the work of the inverter. The DSP not only completes the relevant calculations, but also needs to form pulses, which cannot guarantee the real-time performance of the control, and the control effect is not ideal. Therefore, it is necessary to design a A New Control Method of Unit Cascade Frequency Converter

Method used

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  • Control method of cascaded type frequency converter based on DSP and FPGA
  • Control method of cascaded type frequency converter based on DSP and FPGA
  • Control method of cascaded type frequency converter based on DSP and FPGA

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Embodiment 1

[0047] Such as Figure 1-14 , the power module cascade type high-voltage inverter is to connect the outputs of multiple independent low-voltage power modules in series to achieve high-voltage output. Take five power modules cascaded to output 6KV voltage as an example. The principle is as follows figure 1 As shown, the topology of the main circuit is as figure 2 As shown, the high voltage on the grid side is stepped down by the phase-shifting transformer, and the phase-shifting is generated in the secondary winding. Each power module is supplied by a secondary winding of the phase-shifting transformer. The secondary windings of the phase-shifting transformer are mutually Insulation, each power module adopts three-phase input rectification, single-phase output AC-DC-AC voltage source inverter structure, the inverter module in each power module includes power tubes V1~V4, power tubes V1~ V4 corresponds to freewheeling diodes D1-D4 respectively, V1 and V2 are connected to form...

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Abstract

The invention discloses a control method of a cascaded type frequency converter based on a DSP and an FPGA. According to the control method, the DSP is adopted to receive an input frequency from a keyboard, a modulation degree is calculated, and the modulating wave frequency and the voltage modulation degree are sent to the FPGA through a unique SPI; the FPGA is adopted and used for generating an SPWM signal according to the input modulating wave frequency and the voltage modulation degree in order to control connection and disconnection of a power tube in a main circuit; the main circuit comprises a phase-shifting transformer and n cascaded power modules, and the n is an integer and is larger than or equal to three. Through the control method of the cascaded type frequency converter based on the DSP and the FPGA, the carrier frequency, the modulating wave frequency and the modulation degree can be flexibly adjusted, response is rapid, and the speed control performance of the frequency converter can be effectively guaranteed.

Description

technical field [0001] The invention relates to a control method of a unit cascaded frequency converter based on DSP and FPGA. Background technique [0002] With the strengthening of people's awareness of energy saving and environmental protection, the application of frequency converters is becoming more and more popular, but the energy utilization rate of motor drive systems in my country is very low, especially in the field of high-voltage motors, which is basically 30% lower than the average level abroad. The frequency conversion speed regulation of the motor has gradually gained the attention of the country. The power module cascaded high-voltage inverter has been widely used in the field of high-voltage frequency conversion due to its high reliability and perfect output waveform. [0003] The existing frequency conversion speed regulation of the motor generally uses DSP to control the work of the inverter. The DSP not only completes the relevant calculations, but also n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08
CPCH02P27/085
Inventor 朱俊杰王湘中贤扬
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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