Alternating current and direct current mixed micro electric network and power distribution network circuit link and control method

Abstract

The invention relates to the field of an alternating current and direct current mixed micro electric network and a power distribution network, in particular to an alternating current and direct current mixed micro electric network and power distribution network circuit link and a control method. The circuit link comprises a subordinate voltage source current converter, a three-phase LC low-pass filter and a three-phase voltage transformer, wherein the direct current side of the subordinate voltage source current converter is connected with the direct current bus of the alternating current anddirect current mixed micro electric network; the alternating current side of the subordinate voltage source current converter is connected with one end of the three-phase LC low-pass filter through athree-phase conducting wire; the other end of the three-phase LC low-pass filter is connected to the secondary side of the three-phase transformer; the primary side of the three-phase voltage transformer is connected in series between the alternating current bus of the alternating current and direct current mixed micro electric network and the power distribution network. The circuit link has the advantages that the voltage compensation and current limitation effects are achieved; the voltage stability of a load of an alternating current bus in the alternating current and direct current mixed micro electric network can be ensured; the safety of the electric power electronic devices in the alternating current and direct current mixed micro electric network is also ensured.

Description

technical field [0001] The invention relates to the field of AC-DC hybrid micro-grid and distribution network, in particular to a circuit link between AC-DC hybrid micro-grid and distribution network and a control method. Background technique [0002] The AC-DC hybrid microgrid is a collection of loads, energy storage equipment, AC-DC generators and bidirectional AC / DC power converters. Its operation mode is divided into island mode and grid-connected mode. When operating in island mode, the AC / DC hybrid microgrid is a self-sufficient stand-alone system. When operating in the grid-connected mode, the AC-DC hybrid microgrid is connected to the distribution network, and the distribution network provides voltage support for its AC subnet; The DC hybrid microgrid transmits part of the power to the distribution network, and conversely, the distribution network transmits part of the power to the AC / DC hybrid microgrid. The operation mode of the AC-DC hybrid microgrid determines...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the AC bus voltage of the AC-DC hybrid microgrid cannot be kept constant when the voltage drops, rises suddenly or is unbalanced in the distribution network, and in severe cases, it may even cause a faulty large current at the grid-connected interface, thereby affecting or damaging the power. The problem of electronic devices provides a circuit link and control method between the AC and DC hybrid microgrid and the distribution network

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