A core control board that controls 36 power units

Abstract

The invention relates to a scheme of a core control panel of a converter. The core control panel can control a cascade type converter comprising not more than 36 H-bridge power units, and is mainly used for a cascade static type var generator, a cascade type high-voltage frequency inverter, a cascade type cophase power supply converter, and the like. According to the scheme, the core control panel for controlling 36 power units mainly comprises an FPGA (Field Programmable Gate Array) chip, a DSP (Digital Signal Processor) chip, a CPLD (Complex Programmable Logic Device), operational amplifiers A1-A18, power supply chips IC1-IC4, a chip IC5, a chip EEPROM (Electrically Erasable Programmable Readonly Memory), and the like, wherein the FPGA chip is used for generating control pulse signals of the 36 H-bridge power units and receiving state signals of the power units, the DSP chip is used for a core control algorithm, the CPLD chip is used for input, output and communication of switching value connected with the outside, the operational amplifiers A1-A18 are used for receiving analog signals, the power supply chips IC1-IC4 are used for supplying power for the chips, the chip IC5 is used for detecting the ambient temperature and humidity of the circuit, and the chip EEPROM is used for storing parameters. The circuit runs stably and is wide in application range.

Description

technical field [0001] The present invention designs a core control board scheme of a converter, and specifically designs a core control board that can control a converter composed of no more than 36 power units. Background technique [0002] Cascaded converters have been widely used in high-voltage systems no greater than 35kV, such as cascaded static var generators SVG, cascaded high-voltage frequency converters, cascaded in-phase power supply converters, etc. However, the current core control circuit scheme for controlling this type of converter has the following disadvantages: [0003] 1. Generally, it is a plug-in structure composed of multiple boards, with many connectors, complex structure and low reliability; [0004] 2. Generally, a bus-type circuit structure is adopted. The line between boards is long, and the bus is not only susceptible to crosstalk, but also susceptible to external disturbances; [0005] 3. The board is adjacent to the board, and the mutual int...

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Problems solved by technology

[0003] 1. Generally, it is a plug-in structure composed of multiple boards, with many connectors, complex structure and low reliability;

[0004] 2. Generally, a bus-type circuit structure is adopted. The line between boards is long, and the bus is not only susceptible to crosstalk, but also susceptible to external disturbances;

[0005] 3. The board is adjacent to the board, and the mutual interference between the board and the board is easy to occur;

[0006] 4. The board is closed in the chassis, and the heat dissipation performance is poor;

[0007] 5. It is difficult to detect and measure the signal on the board, and it is necessary to make and use specially designed auxiliary parts for measurement, which increases the difficulty of production testing;

[0008] 6. The board-type control circuit can generally only be used for a specific cascaded converter, such as: either for the control circuit of the cascaded static var generator SVG, or for the cascaded high-voltage inverter The control circuit, or the control circuit for the cascaded non-inverting power supply converter, cannot be used in general for the above-mentioned types of converters

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