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Intelligent power unit and control method of high-power converter device

A converter device, a technology of intelligent power, applied in the direction of converting AC power input into AC power output, AC power input into DC power output, output power conversion device, etc., can solve the problem of low cost, insufficient detection and processing capacity, Problems such as low dead zone compensation accuracy

Active Publication Date: 2018-04-06
四川中大华瑞能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the intelligent power unit and control method of the high-power converter device provided by the present invention is to solve the problem of insufficient fault detection and processing capabilities of existing high-voltage inverters and photovoltaic inverters, and low precision of dead zone compensation; at the same time, it is necessary to ensure information transmission High reliability and synchronous control; low product cost is required while fully optimizing the performance and intelligentization

Method used

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Examples

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Effect test

Embodiment 1

[0044] Embodiment 1: for high-voltage frequency converter

[0045] See figure 2 , The main circuit of each power unit of the high-voltage inverter is composed of three-phase alternating current 1 after phase shifting, rectification and filtering circuit 2, and IGBT full-bridge inverter 3. Each IGBT is connected in parallel with a bypass diode D31, D32, D33, D34 for automatic bypass and fault handling. Each power unit has a pulse width measurement circuit 4, a fault detection circuit, and a drive circuit 8; a main control system 9 for controlling all power units is installed outside.

[0046] The improved control system of present embodiment 1:

[0047] 1) see figure 2 , The power unit control part is equipped with a unit FPGA 5 and a unit STM32 6 (STM32 is the model of the single-chip microcomputer), and the two are directly connected by the high-speed synchronous serial port SPI 6.1 of the unit. The pulse width measurement circuit 4 is connected to the input port of the...

Embodiment 2

[0088] Embodiment 2: for photovoltaic inverter

[0089] See Figure 9 , the intelligent power unit and control method of the high-power photovoltaic inverter in this embodiment are exactly the same as those in Embodiment 1 except for the following features:

[0090] 1) see Figure 9 , The main circuit of the photovoltaic inverter is composed of a photovoltaic panel 1m, a capacitor filter circuit 2m, and an IGBT three-phase inverter bridge 3m.

[0091] For the main circuit corresponding to the high-voltage frequency converter in Embodiment 1, see figure 2 with figure 1 . See figure 1 , each phase of the three-phase frequency conversion power supply is connected in series with multiple to form a high-voltage power supply, and the three-phase AC mains 1 provides phase-shifted three-phase AC power 1 to each through a phase-shifting transformer; each power The main circuit of the unit is composed of three-phase alternating current 1 after phase shifting, rectification and ...

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Abstract

An intelligent power unit and a control method of a high-power converter device. Used in high-voltage frequency converters and photovoltaic inverters. The frequency converter is composed of multiple power units arranged in multiple layers in series for each phase. The power unit is equipped with a field programmable logic array FPGA and a single-chip microcomputer unit STM32, and the two are connected by a serial port SPI. Bus overvoltage detection, temperature measurement, bridge arm open-circuit short-circuit state detection and pulse width measurement with flashing lights are connected to the FPGA inlet, and the outlet is connected to the drive circuit. The main control system is the central data controller and layer controller on the same motherboard. Two optical fibers are used between it and the unit FPGA to realize bidirectional transmission. And all have communication status detection, and transmit according to the specified time sequence to achieve strong anti-interference and ensure real-time fault response. The pulse width measurement dead zone compensation is carried out according to the real waveform, the compensation accuracy is the highest, the waveform of the variable frequency motor remains unchanged, and the torque is stable. The test results show that: the communication speed is fast, the synchronization is good, and the reliability is high. The cost is low when the performance is fully optimized and intelligent. It is used for driving power supply of variable frequency motor and photovoltaic inverter power supply.

Description

[0001] (1) Technical field: The current conversion device involved in the present invention mainly includes a high-voltage frequency converter and a photovoltaic inverter. High-voltage frequency converters are generally used as drive power for large-scale high-voltage variable-frequency motors, such as drive power for high-voltage large fans in thermal power plants, smelters, and cement plants. Photovoltaic inverter as power supply. It belongs to the conversion between AC or AC and DC (H02M). (2) Background technology [0002] The high-voltage frequency converter is used as a frequency-modulated drive power supply for high-voltage variable-frequency motors. It is a high-power and high-voltage device. Its structure is shown in figure 1 , figure 2 . See figure 1 , the three-phase AC mains 1n obtains the phase-shifted three-phase AC 1 through the phase-shifting transformer, which is input to each power unit of each phase, and multiple power units of each phase are connected ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M7/5387
CPCH02M5/458H02M7/53873H02M1/0012H02M1/0016H02M1/007Y02E10/56
Inventor 蒋小春
Owner 四川中大华瑞能源技术有限公司
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