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AC/DC hybrid microgrid cooperative control method

An AC-DC hybrid and collaborative control technology, applied in the direction of AC-DC network circuit layout, AC network circuit, load balancing in DC network, etc., can solve the problems of poor power supply reliability and operation stability, achieve optimal energy utilization, The effect of stable and reliable power supply, high feasibility and correctness

Inactive Publication Date: 2017-06-20
范洪国
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of poor power supply reliability and operation stability of the AC-DC hybrid microgrid, the present invention proposes a collaborative control method for the AC-DC hybrid microgrid

Method used

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  • AC/DC hybrid microgrid cooperative control method
  • AC/DC hybrid microgrid cooperative control method
  • AC/DC hybrid microgrid cooperative control method

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Embodiment Construction

[0017] figure 1 Among them, the DC microgrid part includes a photovoltaic power generation and its control circuit unidirectional DCDC converter, an energy storage device and its control circuit bidirectional DCDC converter, and DC loads, and is connected to the AC bus through a bidirectional ACDC converter to supply AC side loads. Powering and connecting to the large grid.

[0018] Based on the DC bus voltage in the DC microgrid, the hierarchical design coordinates the energy transmission and exchange strategies of photovoltaic cells, energy storage, ACDC, DC loads and AC loads, so that they can operate stably under different working conditions. Each converter works independently and does not need to communicate with each other. The rated voltage of the DC bus voltage of the DC microgrid is set as UN, the voltage within ±10% is floating, and the voltage within 0.9UN~1.1UN is divided into 4 layers.

[0019] figure 2 Among them, the control strategies for the photovoltaic c...

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Abstract

The invention discloses an AC / DC hybrid microgrid cooperative control method which comprises four parts: a DC bus voltage layer, photovoltaic system control, energy storage system control and AC / DC interface control. The control method ensures the full use of the distributed micro-source power generation and the continuous and stable power supply of the planned important load, and optimizes the energy utilization of an energy storage battery. The cooperative control can well cooperatively control the micro source in the microgrid, reasonably allocates and utilizes the energy in an economic way, and can maintain the stability and reliability power supply of the important load in a microgrid system, the stability of DC bus voltage in the DC microgrid, and the constant frequency and constant voltage of AC-side bus voltage in a grid-connected and island stability operating condition. It is proved by facts that the cooperative control method has high feasibility and correctness.

Description

technical field [0001] The invention relates to an AC / DC hybrid microgrid, in particular to a method for collaborative control of an AC / DC hybrid microgrid. Background technique [0002] The microgrid is composed of load, micro power supply and energy storage device, which can provide electric energy and heat energy at the same time. The internal power supply of the microgrid is mainly converted by the load energy of the power electronic device, and provides the necessary control and interface. Microgrids can be divided into two types: AC and DC. Since the traditional large grid exists in the form of AC, AC microgrids are currently being studied more. However, compared with the AC microgrid, the DC microgrid does not have problems such as phase synchronization, harmonics, and reactive power loss, so its research has been paid attention to. In the actual microgrid, there are often two AC and DC busbars at the same time, which are connected to the AC and DC parts of the micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J4/00H02J3/38H02J1/10H02J1/14
CPCH02J1/10H02J1/14H02J3/385H02J3/388H02J4/00Y02E10/56
Inventor 范洪国
Owner 范洪国
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