Single-stage isolation type three-phase bidirectional AC/DC converter and control method

An isolated, single-stage technology, applied in the field of DC microgrid, can solve the problems of closed-loop control difficulty, poor characteristics, affecting the efficiency improvement of the converter, etc., to adapt to a wide range of operating voltages, avoid startup shock problems, and bidirectional power transmission. efficient effect

An isolated, single-stage technology, applied in the field of DC microgrid, can solve the problems of closed-loop control difficulty, poor characteristics, affecting the efficiency improvement of the converter, etc., to adapt to a wide range of operating voltages, avoid startup shock problems, and bidirectional power transmission. efficient effect

CN110061650AActive Publication Date: 2019-07-26FSP POWERLAND TECH
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  • Single-stage isolation type three-phase bidirectional AC/DC converter and control method
  • Single-stage isolation type three-phase bidirectional AC/DC converter and control method
  • Single-stage isolation type three-phase bidirectional AC/DC converter and control method

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Embodiment Construction

[0029] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] figure 1 It is a schematic circuit diagram of a single-stage isolated three-phase bidirectional AC / DC converter of the present invention, including an AC side inductor 1, three AC side capacitors 2, a three-phase full bridge 3, three bidirectional switches 4, and a transformer terminal potential bidirectional clamp It is composed of bit switch 5, single-phase full bridge 6, an isolation transformer 7, rectification / inversion single-phase full bridge 8, DC side filter inductor 9 and DC side filter capacitor 10. figure 1 S in a+ , S a- , S b+ , S b- , S c+ , S c- , S ya+ , S ya- , S yb+ , S yb- , S yc+ , S yc- , S c1 , S c2 , S c3 , S c4 , S p1 , S p2 , S p3 , S p4 , S d1 , S d2 , S d3 , S d4 for the switch tube. Each switch tube is composed of a one-way switch tube and a diode connected in parallel. When conne...

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Abstract

The invention discloses a single-stage isolation type three-phase bidirectional AC / DC converter and a control method. The converter comprises alternating-current side inductors, alternating-current side capacitors, a three-phase full bridge, bidirectional switches, transformer end potential bidirectional clamping switches, a single-phase full bridge, an isolation transformer a rectifier / inverter single-phase full bridge, a direct-current side filter inductor and a direct-current side filter capacitor. A combined control mode combining low-frequency sector switch selection and high-frequency full-bridge phase shifting is adopted. A current source type AC / DC structure is adopted, the rectification mode of the buck type is realized, and the starting impact problem of a conventional boost rectification mode is avoided; and meanwhile, electrical isolation is realized only by a single-stage power conversion circuit, only one full-bridge structure is arranged on the primary side and the secondary side of a high-frequency isolation transformer, and the power flow and the follow-current stage only needs to flow through two power tubes, so that the transmission loss is lowered.

Description

technical field [0001] The invention belongs to the technical field of DC microgrids, and in particular relates to a single-stage bidirectional AC / DC converter. Background technique [0002] As a new form of power supply, the research and application of DC microgrid with new energy as the core is still in the stage of rapid development, and there are still many problems to be solved. DC microgrid is the product of the integration of power electronics technology, information electronics technology and power system, involving multiple research fields such as converter devices, operation control, fault protection, power supply planning, system architecture and communication protocols. Among them, the interface AC / DC converter between the DC microgrid and the AC grid, as the link connecting the two networks, is responsible for regulating the energy balance of the entire microgrid, and is one of the focuses of DC microgrid research. In high-power occasions, a three-phase bidirec...

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Application Information

Patent Timeline
26 Jul 2019
Publication
CN110061650A
IPC
H02M7/797; H02M3/155; H02M3/335
CPC
H02M3/155; H02M3/3353; H02M7/797
Inventors
εΌ ζ–Œι”‹; 谒少军