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Distributed collaborative control method for multiple energy storage units in grid-connected microgrid

An energy storage unit and collaborative control technology, applied in electrical components, AC network circuits, photovoltaic power generation, etc., can solve the problems of geographical dispersion, large quantity, and small capacity of distributed resources, so as to prevent uneven aging and be robust performance, saving communication resources and computing resources

Active Publication Date: 2018-06-29
NANJING UNIV OF POSTS & TELECOMM
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  • Claims
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Problems solved by technology

In terms of control mode, due to the small capacity, large quantity and geographical dispersion of distributed resources in the microgrid, if the traditional centralized control mode is adopted, it is difficult to achieve the expected control objectives and control performance under the condition of limited communication and computing resources.

Method used

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  • Distributed collaborative control method for multiple energy storage units in grid-connected microgrid
  • Distributed collaborative control method for multiple energy storage units in grid-connected microgrid
  • Distributed collaborative control method for multiple energy storage units in grid-connected microgrid

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing and specific embodiment the technical solution of the present invention is described in further detail:

[0039] Examples of microgrids include wind power, photovoltaics, energy storage units, loads. The grid-connected microgrid system of the embodiment of the present invention is as figure 1 As shown, for the example of the microgrid system, the specific steps of implementing the distributed cooperative control using the method of the present invention are as follows:

[0040] Step 1), in order to utilize multiple energy storage units fairly and reasonably and avoid the problem of uneven aging of multiple energy storage units, formulate a control target that multiple energy storage units have the same state of charge and power output rate.

[0041] Express the control objective of step 1 as:

[0042] the s 1 =s 2 =...=s n =s 0

[0043] p 1 =p 2 =...=p n =p 0

[0044] Among them, s i ,p i respectively represen...

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Abstract

The invention discloses a distributed coordination control method of multiple energy storage units in a grid-connected microgrid. The distributed coordination control method is characterized in that charging and discharging behaviors of the energy storage units are coordinated by a distributed control method; and a fluctuation of active power at a common coupling point between the microgrid and a power distribution network is inhibited. The distributed coordination control method comprises the steps of abstracting the energy storage units into a second-order multi-agent system model, and then designing control algorithms of the energy storage units by utilizing the distributed coordination control method. The distributed coordination control method of the energy storage units in the grid-connected microgrid can allow the energy storage units to have the same charging state and the same power output ratio, so that purposes of fairly utilizing the energy storage units and protecting the energy storage units against unbalanced aging are achieved. In addition, the distributed coordination control method can save communication and computing resources for a control center of the microgrid, and has good robustness, adaptivity and extendibility.

Description

technical field [0001] The invention relates to a distributed cooperative control method for multiple energy storage units in a grid-connected microgrid, belonging to the technical field of power system control and scheduling. Background technique [0002] The problem of microgrid system control has become a hot spot in the power industry. The fluctuation of distributed power sources (such as photovoltaics, wind power, etc.) and loads in the microgrid brings many hidden dangers to the safe and economical operation of the power system. For example, due to the instability of distributed power sources and loads, the power at the public coupling point between the microgrid and the distribution network will have large fluctuations, which will bring additional power balance burdens to the large grid. [0003] In recent years, with the rapid development of energy storage technology, energy storage devices have been widely used in microgrids. For the energy storage unit, how to ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/28
CPCH02J3/28H02J3/383H02J3/386Y02E10/56Y02E10/76
Inventor 黄崇鑫霍思宇岳东翁盛煊
Owner NANJING UNIV OF POSTS & TELECOMM
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