Active power router with AC/DC through-fault function

Abstract

The invention discloses an active power router with an AC / DC through-fault function, comprising a high-voltage rectifier-level MMC-AC / DC (modular multilevel converter-AC / DC) converter connected with ahigh-voltage AC distribution network of an AC / DC distribution network via a high-voltage AC port, and a rectifier-level MMC-AC / DC converter and a transformer isolator-level MMC-DC / DC converter both connected with a high-voltage DC distribution work of a high-voltage DC port. A low-voltage DC port of the transformer isolator-level MMC-DC / DC converter is connected with the DC side of a three-phaseDC / AC converter to form a low-voltage DC interface; a low-voltage AC port of the three-phase DC / AC converter may be connected with a low-voltage AC grid or a single-phase / three-phase AC load. The high-voltage side of the active power router is composed of a hybrid sub-module with negative level output, giving the AC / DC through-fault capacity, and ensuring that the power router can run uninterruptibly and reliably when an external AC / DC grid fails; power generation penetration rate of a distributed clean energy and reliability of power supply can be further improved.

Description

technical field [0001] The invention belongs to the field of energy Internet and electrical technology, and more specifically relates to an active power router with AC and DC fault ride-through. Background technique [0002] In recent years, in order to alleviate the increasingly prominent energy, resource and environmental problems, a large number of distributed renewable energy power generation devices have been integrated into the power grid, making the traditional distribution network expand from the simple power supply function to the power generation function. However, the existing AC distribution network is a tree-shaped, weakly connected feeder structure, and the key equipment power frequency electromagnetic transformer has the disadvantages of uncontrollable energy, failure to isolate faults, and no energy storage. Under this background, in recent years, energy The power router, the key equipment of the Internet, has received extensive attention from the academic co...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides an active power router topology with AC-DC fault ride-through, thereby solving the fault ride-through problem of the power router under abnormal working conditions of the medium and high-voltage AC-DC distribution network , while providing multiple AC and DC isolation interfaces, which is conducive to the access of renewable energy, energy storage and flexible loads

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