An Active Power Router with AC-DC Fault Ride-Through

Abstract

The invention discloses an active power router with AC-DC fault ride-through, comprising: a high-voltage rectification-level MMC-AC / DC converter connected to the high-voltage AC distribution network of the AC-DC distribution network through a high-voltage AC port, each The rectification stage MMC‑AC / DC converter and the transformer isolation stage MMC‑DC / DC converter connected to the high voltage DC distribution network of the AC / DC distribution network through the high voltage DC port; the transformer isolation stage MMC‑DC / The low-voltage DC port of the DC converter is connected to the DC side of the three-phase DC / AC converter to form a low-voltage DC port; the low-voltage AC port of the three-phase DC / AC converter can be connected to the low-voltage AC power grid or a single / three-phase AC load. The high-voltage side of the power router disclosed in the present invention is composed of hybrid sub-modules with negative level output, which has AC-DC fault ride-through capability, ensures the uninterrupted and reliable operation of the power router under the fault of the external AC-DC grid, and can further improve the penetration of distributed clean energy power generation efficiency and power supply reliability.

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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