A Combined Bidirectional DC/AC Converter Topology

A converter and combined technology, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, instruments, etc., can solve the limitation of popularization and utilization of photovoltaic power generation technology, high hardware cost, and land occupation. Large area and other problems, to achieve the effect of reducing volume and cost, increasing voltage gain, and ensuring normal operation

Active Publication Date: 2018-11-27
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The high cost of hardware and the large footprint greatly limit the popularization and utilization of photovoltaic power generation technology, and it is urgent to develop technical solutions with low cost and small footprint

Method used

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  • A Combined Bidirectional DC/AC Converter Topology
  • A Combined Bidirectional DC/AC Converter Topology
  • A Combined Bidirectional DC/AC Converter Topology

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Embodiment Construction

[0031] Such as figure 1 As shown, a combined bidirectional DC / AC converter topology is composed of an isolated half-bridge DC / DC converter and a cascaded H-bridge DC / AC converter. The isolated half-bridge DC / DC converter The output of the converter is connected in parallel with the first capacitor C1 as the input of the single-stage H-bridge of the cascaded DC / AC converter, and each stage of the H-bridge is connected to an independent isolated half-bridge DC / DC converter. The isolated half-bridge DC / DC converter includes a first switching tube S1, a second switching tube S2, a third switching tube S3, a fourth switching tube S4, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a Five capacitors C5, high-frequency isolation transformer T, power filter inductor Li, and resonant inductor Ls; the positive pole of the DC power supply U1 is connected to the bridge arm composed of the first switch tube S1 and the second switch tube S2 after passing through the powe...

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Abstract

The invention discloses a topological structure of a combined bidirectional DC / AC (direct current / alternating current) converter, and belongs to the technical field of power conversion. The topological structure is characterized in that the topological structure comprises three-phase circuits which are the same with one another; each phase comprises an isolating half-bridge DC / DC converter and a cascading H-bridge DC / AC converter; the output terminal of the isolating half-bridge DC / DC converter is connected with a first capacitor (C1) in parallel and then is served as the input terminal of the cascading H-bridge DC / AC converter; each stage of H bridge is connected with an independent isolating half-bridge DC / DC converter; and EMTDC electro-magnetic transient simulation performed to circuit topology under typical parameters shows that the topological structure has a high voltage matching capability, and bidirectional flow of energy can be realized through phase-shifting control. The topological structure can be applied to occasions of high-power adjustment based on battery energy storage, energy storage power station, smooth renewable energy source generated output power, frequency and voltage adjustment in microgrid and the like, and has a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of power conversion, and in particular relates to a combined bidirectional DC / AC converter topology. Background technique [0002] Renewable energy power generation technology is currently a research hotspot that countries around the world are chasing after each other, and there are two issues that attract special attention. [0003] First, due to the intermittence and volatility of renewable energy such as wind energy and solar energy, grid-connected renewable energy power poses a great challenge to the stability and control of the power system. Friendly and dispatchable renewable energy is the goal that people yearn for and pursue. Energy storage and power compensation technology is the key to solving this problem, and a unified power conversion device that can realize reactive power compensation and bidirectional active power regulation is urgently needed. [0004] Second, research on new high-efficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/72H02M7/797H02M3/335
Inventor 吴俊勇苗青郝亮亮艾洪克熊飞齐大伟
Owner BEIJING JIAOTONG UNIV
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