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Pulse width modulation control method for multistage superposed high-voltage frequency converter

A high-voltage inverter and pulse width modulation technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve problems such as performance and price that cannot meet market demand

Inactive Publication Date: 2008-08-20
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, related products of multi-level superimposed high-voltage inverters have appeared, but due to factors such as performance and price, they are far from meeting the needs of the market, and one of the keys to determine their performance is to perform PWM (pulse width modulation) control on them. method

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  • Pulse width modulation control method for multistage superposed high-voltage frequency converter
  • Pulse width modulation control method for multistage superposed high-voltage frequency converter
  • Pulse width modulation control method for multistage superposed high-voltage frequency converter

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Embodiment Construction

[0026] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0027] figure 1 It is a schematic diagram of a multi-stage superimposed high-voltage inverter module unit, including a rectification part on the left and an H bridge on the right, wherein the switch tubes 11, 12, 21, and 22 are insulated gate bipolar transistors (IGBTs). In the figure, the switch tube 11 is called the left tube of the upper arm, the switch tube 21 is called the right tube of the upper arm, the switch tube 12 is called the left tube of the lower arm, and the switch tube 22 is called the right tube of the lower arm. figure 1 The "control signal" in is the pulse width modulation control signal that controls the switch tube. The four signals are respectively connected to the four switch tubes. The pulse width and duty cycle of the control signal determine the on and off time of the switch tube.

[0028] The multi...

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Abstract

The present invention discloses a pulse duration modulation control method for multistage superimposed high-voltage frequency converter, and is characterized by respectively inputting one pulse duration modulation signal to four switching tubes on every unit in every stage of multistage superimposed high-voltage frequency converter so as to control conducting and switching-off time of every switching tube, and the calculation of conducting time uses voltage space vector method, and the switching tubes in every unit of every phase can be pregrossively conducted, and the time interval is Ts / m.

Description

【Technical field】 [0001] The invention relates to a pulse width modulation control method for a multi-stage superimposed high-voltage frequency converter. 【Background technique】 [0002] With the deepening of my country's reform and opening up and the acceleration of economic construction, the demand for energy is also increasing, and the large demand for energy will, on the one hand, lead to a sharp reduction in resources such as oil, natural gas, and coal for energy production. , thus causing future energy scarcity. On the other hand, the large-scale exploitation of resources and the large-scale production of energy will destroy the ecological balance, pollute the atmosphere, etc., and lead to the deterioration of the environment. Saving energy and improving energy utilization have become a common concern of the whole society. Therefore, adjusting the speed of AC motors, especially high-voltage AC motors, can save a lot of electric energy, which not only reduces the waste...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/42
Inventor 宋凌峰丁宇刘克彬王卫勤
Owner EMERSON NETWORK POWER CO LTD