High Frequency Megawatt Bidirectional Converter

Abstract

The embodiment of the invention discloses a high-frequency megawatt bidirectional converter. The high-frequency megawatt bidirectional converter comprises an alternating current filter, an isolation transformer, an alternating current auxiliary contactor, a buffering resistor soft start system, an LC filtering energy storage device, a three-phase full-bridge IGBT main power alternating current circuit, a direct current filter and a direct current soft start system. By means of the high-frequency megawatt bidirectional converter, electric power resources in a smart power grid can be effectively regulated, day and night peak-valley difference is removed, the output waveform deviation factor is effectively reduced, a load is smoothened, the safety of the power grid is guaranteed, meanwhile, an electrical device connected with the high-frequency megawatt bidirectional converter is kept in a continuous operation state, and the problem that huge economic losses are brought to users due to the device damage caused by the loss of power of the power grid is avoided.

Description

Technical field [0001] The invention relates to a bidirectional converter, in particular to a high-frequency megawatt-level bidirectional converter. Background technique [0002] The power of the existing two-way converters is generally small, unable to achieve the megawatt level, and can only drive small electrical loads. For the energy storage of large-scale plant electrical loads, it can only be achieved by combining multiple inverters. Parallel converters can increase the power, but it is difficult to ensure the consistency of the output of multiple inverters. For high-power loads, damage to the equipment due to excessive instantaneous current often occurs. At the same time, this two-way converter does not have the mode of switching between grid-connected operation and island operation, that is, when the AC side grid fails, the two-way converter will lose power and does not have EPS emergency functions, which may easily cause damage to precision equipment. Bring huge econom...

AI Technical Summary

Problems solved by technology

[0002] The power of existing bidirectional converters is generally small, unable to reach the megawatt level, and can only drive small power loads. For the energy storage of large-scale power loads in the factory area, only by combining multiple inverters Inverters are connected in parallel to increase the power, but it is difficult to ensure the consistency of the output of multiple inverters

For high-power loads, equipment damage occurs from time to time due to excessive instantaneous current

At the same time, this kind of bidirectional converter does not have a switching mode between grid-connected operation and island operation, that is, when the AC side power grid fails, the bidirectional converter will lose power and does not have the EPS emergency function, which may easily cause damage to precision equipment. Bring huge economic losses to users

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