Three-level topology ANPC four-quadrant operation modulation method

A modulation method and a three-level technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output, etc., to achieve the effects of reducing switching loss, optimizing freewheeling mode, and reliable two-way voltage equalization

Active Publication Date: 2021-04-20
西安奇点能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the elaboration of above-mentioned background technology, the present invention provides a kind of three-level topology ANPC four-quadrant operation modulation method, the present invention is based on three-level topology ANPC in four quadrants The PWM modulation method that can effectively balance the loss of each power device when operating under certain conditions can effectively solve the problem of equalizing the loss of each power device under four-quadrant operating conditions

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[0048] according to figure 1 As shown, the modulation method mentioned in the present invention is applicable to the turn-on and turn-off control of the six power devices G1 to switch G6 in the three-level topology ANPC in the figure, so as to realize power conversion. A three-level topology ANPC four-quadrant operation modulation method proposed by the present invention, when freewheeling in the zero-level state, first turn on the switch tube G5 and switch tube G6, and use a short freewheeling path for freewheeling; then open The switch tube G2 and the switch tube G3 tube have additionally opened a freewheeling circuit. When the positive / negative level is output, the switching tube G6 / switching tube G5 is turned on in a timely manner, and the voltage borne by the switching tube G3, switching tube G4 / switching tube G1, and switching tube G2 is reliably clamped.

[0049] according to figure 2 As shown, zero-level freewheeling can be divided into four working conditions as sh...

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Abstract

The invention discloses a three-level topology ANPC four-quadrant operation modulation method. According to the method, a high-frequency modulation signal is adopted to drive a PWM driving signal of a power device; when zero-level follow current starts, one short follow current path is firstly used for forced commutation, then one follow current path is additionally opened, and loss is balanced; when the zero-level follow current is finished, the additionally opened follow current path is firstly turned off, and the current is forced to follow current again from the short follow current path; when positive/negative electricity is output, a clamping tube is switched on at proper time, and reliable bidirectional clamping is carried out on two series-connected pressure-bearing switching tubes. According to the modulation mode, on one hand, a zero-level follow current mode and a follow current loop are optimized, the switching loss of the power device is reduced, the loss distribution of the power device under various working conditions during rectification, inversion and four-quadrant operation is balanced, and on the other hand, a voltage-bearing power device is reliably clamped to realize the advantage of voltage equalization. The method has the characteristics of simple structure, flexible implementation scheme, high power conversion efficiency and balanced four-quadrant operation loss.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a PWM modulation technology of ANPC power circuit topology, in particular to a three-level topology ANPC four-quadrant operation modulation method. Background technique [0002] Thanks to the rapid development of power electronics technology, multi-level technology has been more and more widely used, among which diode-clamped (NPC) three-level technology is the most commonly used power in low-voltage (below 3kV) applications. Electronic power conversion technology. This structure does not use a transformer, the structure is more compact, and the cost is lower, but this structure has the problem of unbalanced loss of power devices (mainly referring to IGBTs), which limits the improvement of system capacity, and considering factors such as cost, the power The degree of device integration is very high, and once the loss is unbalanced, it will seriously affect the stability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M1/08H02M1/088
CPCY02B70/10
Inventor 刘永奎曹立航张新涛
Owner 西安奇点能源股份有限公司
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