Anti-external transmission circuit of bidirectional converter

Abstract

The present invention discloses an anti-external transmission circuit of a bidirectional converter. The anti-external transmission circuit comprises an energy storage unit D, a bidirectional converter E, a fault separation execution unit A, a current detection circuit B and an analyzing and processing unit C. The fault separation execution unit A comprises a relay RL1, a switching tube Q1, a diode D1 and a fuse F1, and the output end Vin+ of the bidirectional converter E is connected with a contact of the relay RL1 and the source of the switching tube Q1 separately. The beneficial effects of the present invention are that 1 an active detection scheme is adopted to detect the short circuit fault conditions in the converter real-timely and dynamically; 2 when an internal short circuit fault is detected, a fault separation circuit is started rapidly to cut off the connection with the energy storage unit actively; 3 the faulted converter rapidly quits a system quickly, thereby not influencing the normal operation of other parallel converters; meanwhile, an alarm signal is given out and send to a customer to prompt the customer to replace the faulted converter.

Description

technical field [0001] The invention relates to an anti-outflow circuit, in particular to an anti-outflow circuit for a bidirectional converter. Background technique [0002] With the rapid development of smart grid and energy interconnection, products that convert and transmit electric energy in two directions have become market hotspots in this field. Compared with the unidirectional converter, the output current of the bidirectional converter is bidirectional, and can transmit power from the grid to the energy storage unit, and can also transmit power from the energy storage unit to the grid. Therefore, when an internal short-circuit fault occurs in the converter, the energy of the energy storage unit will be violently fed back into the bidirectional converter, resulting in relatively serious damage to the converter or even a fire, which will bring greater losses to the market and customers. Therefore, there is a need for an effective solution. Under certain extreme inte...

AI Technical Summary

Problems solved by technology

The disadvantage is that this type of fusing is overly dependent on the magnitude of the short-circuit current

When the short-circuit current is not large enough, the fuse or air switch cannot effectively fuse / disengage, and cannot effectively prevent the external filling of the energy storage unit, which still causes serious damage and fire to the converter.

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