Two-stage matrix converter topology capable of outputting AC and DC voltages

Abstract

The invention discloses a two-stage matrix converter topological structure being capable of outputting alternating voltage and direct voltage. The structure comprises a three-phase alternating current power supply, a three-phase filter inductor, a voltage-source rectifier, a current-source inverter, a three-phase alternating current load, an alternating current load LC filter and a direct current output circuit. The topological structure can output alternating voltage and direct voltage at the same time, can realize alternating / direct current integrated operation in application scenarios such as distributed power generation systems, and is very helpful in reducing system volume and weight; meanwhile, both alternating current output voltage magnitude and direct current output voltage magnitude can greater than or smaller than an alternating current input supply voltage magnitude at the same time, and the voltage regulating range of the existing two-stage matrix converter is broadened.

Description

technical field [0001] The invention relates to an electric energy conversion device. Background technique [0002] Matrix converter is a new type of AC-AC converter, which has the characteristics of small size, light weight and long working life. Research. The two-stage matrix converter is a subclass of the matrix converter, including two parts: the current source converter (Current Source Converter, CSC) and the voltage source converter (Voltage Source Converter, VSC). The busbars are connected, but there is no DC energy storage element. Compared with the traditional matrix converter, the two-stage matrix converter has the advantages of simple clamping circuit and easy implementation of commutation control strategy, and can reduce the number of switches under certain conditions, which has attracted extensive attention of researchers. [0003] Conventional AC power conversion systems based on dual-stage matrix converters mainly have two structures, such as the attached ...

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Problems solved by technology

If the voltage drop of the filter inductor is ignored, the following conclusions can be obtained: figure 1 , the load voltage amplitude is less than 0.866 times the power supply voltage amplitude, that is, the attached figure 1 The system shown can only realize step-down conversion; figure 2 , the power supply voltage amplitude is less than 0.866 times the load voltage, that is, the attached figure 2 The system shown can only achieve boost conversion

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