Operation optimization method of AC-DC hybrid microgrid based on grid-connected three-port power electronic transformer
An AC-DC hybrid, power electronic technology, applied in the parallel feeding arrangement of single network, wind power generation, photovoltaic power generation, etc. The effect of improving the continuity and reliability of power supply, improving the utilization rate of new energy, and expanding the scale of microgrids
Active Publication Date: 2021-07-09
NANJING INST OF TECH
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Problems solved by technology
Due to technical limitations, the three-port PET capacity cannot be greatly increased in the short term, which limits the scale of microgrids connected to the grid through PET
[0004] The operation optimization of the AC-DC hybrid microgrid is mainly aimed at the lowest operating cost, but this optimization method is difficult to give full play to the autonomy of the microgrid and the synergy between the AC microgrid and the DC microgrid, and will cause large power fluctuations at the grid-connected point, and grid-connected The spare capacity of the equipment is large, and the scale of the micro-grid connected to the grid through PET is more limited
The maximum consumption of new energy is another important goal of micro-grid optimization, but new energy and load fluctuations in the micro-grid make scheduling difficult
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[0025] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] In order to facilitate the micro-grid autonomy and the mutual coordination of AC micro-grid, DC micro-grid and main network, the AC-DC hybrid micro-grid with three-port PET grid-connected is divided into micro-grid layer, mixed layer and grid-connected point layer, such as figure 1 shown. When the power of the microgrid is unbalanced, first use the autonomy capability of the microgrid layer to stabilize the fluctuation; if the microgrid layer cannot stabilize the fluctuation, coordinate the AC microgrid and DC microgrid power exchange through the hybrid layer; if the control of the first two layers cannot stabilize the power fluctuation, through The overall control of the grid-connected point layer coordinates the energy transfer of the main grid, AC micro-grid, and DC micro-grid to rebalance the micro-grid.
[0027] T...
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The invention discloses an AC / DC hybrid micro-grid operation optimization method based on three-port power electronic transformer connected to the grid, comprising the following steps: (1) proposing a layered control structure; (2) establishing a layered optimization model; (3) improving For the power supply and storage index, the improved supply and storage index is used to simplify the model constraints; (4) The multi-objective weighting and genetic algorithm are used to solve the model to obtain the optimal operation mode of the AC-DC hybrid microgrid. The present invention considers the restriction of PET capacity on the scale of the microgrid, the autonomy of the microgrid, and the coordination between the AC microgrid and the DC microgrid, and can expand the scale of the microgrid connected by PET, improve the utilization rate of new energy, and reduce the load and DG. The equivalent power change rate provides guidance and assistance for formulating the operation mode of the AC-DC hybrid microgrid.
Description
technical field [0001] The invention relates to operation optimization of an AC / DC hybrid microgrid, in particular to an operation optimization method for an AC / DC hybrid microgrid based on grid-connected three-port power electronic transformers. Background technique [0002] The output of intermittent distributed generation (DG) fluctuates greatly, which affects the safe and stable operation of the power grid. In order to meet the needs of DG grid connection, microgrids with good regulation characteristics have been developed rapidly in recent years. Microgrids are divided into AC microgrids and DC microgrids. AC microgrids are the main form of DG grid connection at this stage. With the rapid development of DC power sources such as photovoltaics and energy storage and DC loads such as electric vehicles, DC microgrids that omit the intermediate commutation link have received extensive attention in recent years. For some time to come, AC microgrids and DC microgrids will co...
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IPC IPC(8): H02J3/38
CPCH02J3/382H02J3/383H02J3/386H02J2203/20Y02E10/56Y02E10/76
Inventor 郝思鹏黄堃周宇刘思亦
Owner NANJING INST OF TECH