An improved three-phase four-leg topology for active power decoupling
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A three-phase four-leg, source power technology, applied in the direction of output power conversion device, conversion of AC power input to DC power output, reduction of multi-phase network asymmetry, etc. The advantages of the three-phase four-arm topology, the impact on the system life and other issues, to achieve the effect of reducing the total capacitance, reducing the capacitance, and avoiding the impact
Active Publication Date: 2021-01-12
普世通(北京)电气有限公司
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In order to achieve power decoupling on the AC and DC sides, the traditional three-phase four-bridge arm usually adopts passive power decoupling schemes such as increasing the capacitance on the DC side, which leads to a further increase in cost and volume, affects the life of the system, and is not conducive to the use of three-phase Advantages of the four-leg topology
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[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0024] On the contrary, the present invention covers any alternatives, modifications, equivalents and arrangements within the spirit and scope of the present invention as defined by the appended claims. Further, in order to give the public a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.
[0025] In view of the existing technology, the traditional three-phase ...
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Abstract
The invention belongs to the technical field of power electronics, and specifically relates to an improved three-phase four-bridge arm topology for realizing active power decoupling used in a system containing a single / three-phase unbalanced load or source. The improved three-phase four-bridge arm topology comprises eight switch tubes S1, S2, S3, S4, S5, S6, S7, S8, four inductors La, Lb, Lc and Ln and five capacitors Ca, Cb, Cc, Cn, Cdc. When the single / three-phase unbalanced load or source exists, a fourth bridge arm is controlled, a passage is provided for a zero-sequence component by usinga center line, and then three-phase phase voltage balance is realized, and high-quality power supply is provided for the load; secondary impulse power on an alternating current side is provided by the capacitors on the alternating current side through active power decoupling control, a direct current side just needs to provide the average power component on the alternating current side, on the basis of without adding switch devices, a secondary impulse power decoupling purpose is realized, the tolerance of supporting capacitors on the direct current side can be reduced effectively, and the influence of secondary impulse power on direct current source or front system control performance is avoided.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an improved three-phase four-bridge arm topology for realizing active power decoupling, which is used in a system with single / three-phase unbalanced loads or sources. Background technique [0002] With the large-scale application of distributed energy, the research of microgrid has attracted more and more attention. Its operation is flexible and reliable, and it can be connected to the grid or operate autonomously in isolated islands in the event of grid failure. The best way to get energy. In the prior art, when the microgrid works in the island mode, the existence of single / three-phase unbalanced loads or sources easily causes unbalanced three-phase voltages. The three-phase three-leg converter with Δ / Yn transformer uses the transformer to provide the zero-sequence path. This method is simple to control, but due to the addition of the power frequency tran...
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