A Carrier Modulation Method for Three-phase Current Source Converter
A three-phase current, carrier modulation technology, applied in the direction of AC power input conversion to DC power output, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of low DC current utilization, complex implementation process, large switching loss, etc. Achieve high DC current utilization, no need for overlapping current, and low switching loss.
Active Publication Date: 2020-02-04
YANSHAN UNIV
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Problems solved by technology
Although this scheme can effectively control the switch, it has the disadvantages of low utilization rate of DC current, complex implementation process and large switching loss.
Compared with indirect carrier modulation, although direct carrier modulation can overcome the above shortcomings, it is more complicated to realize the driving signal by using dual carrier and modulation wave comparison.
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[0016] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
[0017] figure 1 The schematic diagram of the three-phase current source converter is shown. The carrier modulation method proposed by the present invention divides the power frequency cycle into 12 intervals, such as figure 2 As shown, the driving signal generation principle diagram of the carrier modulation method proposed by the present invention, as shown in image 3 As shown, the content of the method includes the following steps:
[0018] (1) First, the three original reference signals v a , v b and v c Take the absolute value to get three new reference signals |v a |, |v b |and |v c|; Then, according to the intersection between every two of the three new reference signals, divide the power frequency cycle into 12 intervals on average, which are defined as intervals 1 to 12; in each interval, for the three new reference ...
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The invention discloses a carrier modulation method for a three-phase current source type converter. The main technical points are as follows: first, the absolute value of the original reference signal is taken to obtain a new reference signal, and the power frequency cycle is divided into 12 intervals; then in each interval, sort the instantaneous value of the new reference signal by size, select the first two as modulation signals, which are respectively defined as modulation signal 1 and modulation signal 2; select a single triangle wave as the carrier signal; use three-phase The clamping characteristic of the diode in the forward direction of the bridge arm of the current source converter compares the modulation signal with the triangular carrier directly to generate the switching tube signal. The beneficial effect of the present invention is that the modulation signal is directly compared with the triangular carrier wave to generate the switch tube signal, no overlapping current is required, and the invention has the advantages of high direct current utilization rate and small switching loss.
Description
technical field [0001] The invention belongs to the field of power electronic conversion, and in particular relates to a carrier modulation method for a three-phase current source converter. Background technique [0002] According to the output characteristics of the DC side of the system, three-phase power converters can be divided into voltage source converters and current source converters. figure 1 shown. Current source converters have the characteristics of adjustable input power factor, low current harmonic content and high reliability. In recent years, they have received more and more attention in the fields of photovoltaic power generation systems, fuel cell power supply systems and uninterruptible power supply systems. [0003] At present, the modulation strategies used in current source converters include selective harmonic cancellation modulation, carrier modulation and space vector modulation. Among them, the selection of harmonic elimination modulation belongs...
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IPC IPC(8): H02M7/219
CPCH02M7/219H02M1/0054Y02B70/10
Inventor 郭小强何美玲
Owner YANSHAN UNIV