Hybrid energy storage capacity optimal allocation method for AC/DC hybrid microgrid

A capacity-optimized configuration, AC-DC hybrid technology, applied in the direction of AC network load balancing, single AC network with different frequencies, reducing/preventing power oscillation, etc. The effect of reducing the peak-to-valley difference

Pending Publication Date: 2019-10-08
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] In order to solve the power imbalance problem in the AC / DC hybrid microgrid caused by wind and solar output fluctuations and load fluctuations, the present invention establishes a two-layer optimal configuration model of hybrid energy storage capacity of the AC / DC hybrid microgrid based on ensemble empirical mode decomposition

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  • Hybrid energy storage capacity optimal allocation method for AC/DC hybrid microgrid
  • Hybrid energy storage capacity optimal allocation method for AC/DC hybrid microgrid
  • Hybrid energy storage capacity optimal allocation method for AC/DC hybrid microgrid

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Embodiment Construction

[0042] figure 1 As shown, the AC-DC hybrid microgrid system includes an AC subnet and a DC subnet. The distributed power sources on the AC side are wind turbines, and the distributed power sources on the DC side are photovoltaic and hybrid energy storage systems.

[0043] The microgrid contains both AC bus and DC bus, which can directly supply power to AC loads and DC loads. The AC and DC buses are connected through bidirectional interconnection converters, and the AC and DC hybrid microgrid is connected to the large power grid through tie lines.

[0044]In the embodiment, the unit power cost coefficient of the lithium battery is 9000 yuan / kW, the unit capacity cost coefficient is 2500 yuan / kWh, the operation and maintenance cost coefficient is 0.05 yuan / kWh, the charge and discharge efficiency is 90%, and the initial capacity is 100% of the rated capacity 0.6 times, the upper limit of the remaining capacity is 0.8 times the rated capacity, the lower limit of the remaining ca...

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Abstract

The invention provides a hybrid energy storage capacity optimal allocation method for an AC/DC hybrid microgrid, and belongs to the field of the AC/DC hybrid microgrid. The hybrid energy storage capacity optimal allocation method comprises the steps: establishing a hybrid energy storage capacity two-layer optimal allocation model; power allocation verification based on set empirical mode decomposition; and allocation of the hybrid energy storage system capacity. The power commands of the lithium battery and the supercapacitor are obtained by the filter order. The energy storage life and the converter loss are comprehensively considered with the rated power and the rated capacity of the lithium battery and supercapacitor as the optimization variables and the annual integrated cost of the system as the goal, and an adaptive particle swarm optimization algorithm is applied to perform optimal solution so as to obtain the optimal annual integrated cost of the system and the corresponding rated power and rated capacity of the lithium battery and the supercapacitor. The problem of tie-line power fluctuation caused by wind-optical output fluctuation and load fluctuation in the AC/DC hybridmicrogrid can be solved.

Description

technical field [0001] The invention relates to the field of AC-DC hybrid micro-grids, and relates to a hybrid energy storage capacity optimization configuration method of AC-DC hybrid micro-grids. Background technique [0002] The AC-DC hybrid microgrid combines the advantages of the AC microgrid and the DC microgrid. It omits many commutation links, reduces the system operation loss, and makes the control of the microgrid more flexible. However, due to the volatility and uncontrollability of renewable energy generation such as wind and light, it is necessary to configure a certain amount of energy storage in the AC-DC hybrid microgrid to reduce the adverse effects of renewable energy generation. The hybrid energy storage system is a more efficient and economical energy storage system that integrates the characteristics of energy-type energy storage and power-type energy storage. Lithium batteries, as energy storage, can provide long-term power shortages, while supercapaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/28H02J3/02H02J3/24
CPCH02J3/28H02J3/02H02J3/24H02J2203/20
Inventor 魏斌郭玲娟韩肖清李雯于浩朱云杰
Owner TAIYUAN UNIV OF TECH
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