Three-phase single-phase high-frequency link matrix PET topology and modulation

Abstract

The invention discloses three-phase single-phase high-frequency link matrix PET topology and modulation, which belong to the technical field of power electronic power converter topology and modulation. The topology is formed by connecting a three-phase alternating current power supply, an input L filter, a pre-stage matrix converter, a high-frequency transformer, a backward-stage matrix converter,an output LfCf filter and a load. Magnetic coupling and power transmission are performed by adopting a high-frequency transformer, conversion of output voltage and frequency is realized by using a voltage type circuit topology, and a decoupling modulation strategy of combining discrete SVPWM of a pre-stage circuit and discrete SPWM of a post-stage circuit of the transformer in a double-frequencyphase locking mode is adopted, so that a bidirectional switch of the matrix converter reasonably works. Safe current conversion of the matrix converter is realized by adopting a discrete control modeas a whole, and voltage spikes generated by existence of leakage inductance of the transformer are effectively suppressed.

Description

technical field [0001] The invention relates to the technical field of power electronic power converter topology and its modulation, in particular to the three-phase-single-phase high-frequency chain matrix PET topology and modulation. Background technique [0002] In the traditional power grid, the distribution network transformer plays a very important role as a device for voltage level conversion and energy transmission. Traditional power transformers have the advantages of simple structure, high reliability, and low cost. However, it has the transformation of different voltage levels and the isolation of different systems. These basic functions have not changed, and there are still many places to be improved. At the same time, traditional power electronic transformers have many disadvantages: large volume, heavy weight, high no-load loss, and environmental pollution caused by the use of insulating oil; traditional distribution network transformers couple AC voltage from...

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Problems solved by technology

However, it has the transformation of different voltage levels and the isolation of different systems. These basic functions have not changed, and there are still many areas for improvement.

At the same time, traditional power electronic transformers have many disadvantages: large volume, heavy weight, high no-load loss, and environmental pollution caused by the use of insulating oil; traditional distribution network transformers couple AC voltage from the primary side to the secondary side through the iron core and windings. side, in order to realize the transformation of voltage level

Since the traditional transformer does not have the ability to control the voltage and current, as long as there is any power quality problem on one side of the primary side and the secondary side, it will be transmitted to the other side, affecting the normal operation of the other side; the traditional transformer needs to be equipped with special relay protection device for protection

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