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Converter and its control method
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A control method and converter technology, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve the problems of large turn-off peak voltage and excessive current of semiconductor switching devices, Reach the effect of reducing the turn-off peak voltage, increasing the service life, improving the operation reliability and capacity
Active Publication Date: 2021-08-31
SHENZHEN HOPEWIND ELECTRIC CO LTD
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[0005] In view of this, the purpose of this application is to provide a converter and its control method to solve the problem that the semiconductor switching device will bear a large turn-off peak voltage during the turn-off process due to the excessive current in the commutation path
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no. 1 example
[0030] In order to better illustrate the embodiment of the present application, the following combination Figure 1-Figure 5 The control process of the existing NPC topology converter is described:
[0031] Such as image 3 As shown, the NPC topology converter includes a DC positive port P, a DC midpoint O, a DC negative port N, an NPC bridge arm circuit, and an AC output port AC.
[0032] Two-level semiconductor power modules (PM1-PM3 in the figure) can refer to figure 2 As shown, each two-level semiconductor power module includes two semiconductor switching devices S1, S2, and two diodes D1, D2; wherein, each semiconductor switching device includes a current input interface C, a current output interface E, a control Interface G; each diode interface includes a current input port A and a current output port K. For ease of description, the following descriptions are described in the form of PMx:Sy, PMx:Dy, where x and y represent numbers, and PMx:Sy represents the semicond...
no. 2 example
[0082] The second embodiment of the present application provides a flutter converter. The converter includes a DC positive port, a DC midpoint, a DC negative port, an AC output port, and a DC positive port and a DC negative port. The bridge arm circuit between;
[0083] The bridge arm circuit includes a first power module, a second power module, and a third power module; each power module includes a first diode, a second diode, and a first semiconductor switching device and a second semiconductor switch device connected in series. two semiconductor switching devices, the first semiconductor switching device is connected in antiparallel to the first diode, and the second semiconductor switching device is connected in antiparallel to the second diode;
[0084]The first end of the first power module is connected to the DC positive port, the second end is connected to the first end of the second power module, and the third end is connected to the DC midpoint; the second power The...
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Abstract
The present application discloses a converter and its control method. The control method of the converter includes switching between the preset voltage and the first voltage when the voltage difference between the AC output port and the DC midpoint, and the current direction When the AC output port flows to the bridge arm circuit, and / or, when the voltage difference between the AC output port and the DC midpoint is switched between the preset voltage and the second voltage, and the current direction is from the bridge arm circuit to the AC When the output port is used, the working state of the semiconductor switching device in the bridge arm circuit is controlled to add a current flow path. This application adds a current flow path by controlling the working state of the semiconductor switching device in the bridge arm circuit, which reduces the turn-off peak voltage borne by the semiconductor switching device during the turn-off process, increases the service life of the semiconductor switching device, and improves the efficiency of the transformer. The operational reliability and capacity of the streamer.
Description
technical field [0001] The present application relates to the technical field of power electronics, in particular to a converter and a control method thereof. Background technique [0002] In 1980, A. Nabae of Nagaoka University of Science and Technology in Japan proposed a diode neutral point clamp (NPC) topology converter at the IEEE-IAS annual meeting. Such as figure 1 As shown, because the NPC topology adopts the method of connecting two busbars in series, the busbar voltage and AC output voltage can be increased, and the switching loss of semiconductor switching devices can be reduced; therefore, the NPC topology has been widely used, and various semiconductor manufacturers have also developed NPC-based topology. semiconductor power modules. In addition, due to the limitations of packaging and parasitic inductance, the power of integrated NPC semiconductor power modules is generally small, while the two-level semiconductor power modules widely used in the market have ...
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