AC-DC hybrid microgrid group series-parallel hybrid network structure, control system and operation control method

Abstract

An AC-DC hybrid microgrid group series-parallel hybrid network structure, control system and operation control method, the AC-DC hybrid smart microgrid group network structure includes a plurality of AC series sub-microgrids and AC parallel sub-microgrids , DC sub-microgrid, and multiple flexible DC power distribution systems; each AC series sub-microgrid, AC parallel sub-microgrid, and DC sub-microgrid are connected in series-parallel hybrid mode through the flexible DC power distribution system; the AC distribution network is connected through The PCC point switch of the microgrid group is connected to the first-level AC series sub-microgrid; each AC series sub-microgrid is serially connected through the adjacent flexible DC power distribution system converter valve and DC bus to form a series network topology ; Each DC sub-microgrid is connected to the DC bus of the corresponding flexible DC power distribution system through a bidirectional DC / DC converter; each AC parallel sub-microgrid is connected in parallel to the serially connected DC bus through the parallel converter valve of the flexible DC power distribution system The DC bus of the flexible DC power distribution system.

Description

technical field [0001] The invention belongs to the technical field of distributed power generation and micro-grid, and relates to a series-parallel hybrid networking structure of an AC-DC hybrid micro-grid group and an operation method thereof. Background technique [0002] Energy is an important material basis for economic and social development. In recent years, the continuous growth of energy demand, the depletion of fossil energy, and the restrictive development of nuclear energy have made energy issues increasingly a serious challenge for countries all over the world. In addition, the deteriorating ecological environment, the aging of the traditional power system structure, and the increasingly high requirements of users for power quality have made the development and utilization of renewable energy gradually become the only way for the sustainable development of society. In order to achieve sustainable energy utilization and harmonious economic and social development...

AI Technical Summary

Problems solved by technology

This networking method mainly has the following shortcomings: 1. The flexibility of the system networking is limited, and it cannot fully meet the requirements of multi-working and complex application scenarios when the microgrid group is widely used in the distribution network in the future; For domain-distributed distributed power sources and user loads, the interconnection of sub-microgrids through AC will cause system reactive power / voltage fluctuations due to long-distance distribution line transmission, so the system needs to be equipped with additional reactive power compensation devices. At the same time It will also bring difficulties to the stable operation control of the microgrid group due to reactive power / voltage fluctuations; 3. The DC sub-microgrid is connected through the AC / DC bidirectional converter as a part of the AC sub-microgrid, and the AC sub-microgrid The operation stability and power quality of the power supply will affect the stable operation of the AC / DC bidirectional converter, and then affect the stable operation of the DC sub-microgrid

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