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Distributed control method for unbalanced voltage compensation of island alternating current microgrid

A distributed control and balanced voltage technology, which is applied in the direction of AC network voltage adjustment, AC network load balancing, and AC network circuits, can solve undiscussed and unproven problems such as unbalanced voltage compensation stability, and achieve the goal of reducing communication burden Effect

Pending Publication Date: 2022-03-25
深圳市启点新能源科技有限公司 +1
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Problems solved by technology

[0008] Although these works report the application of ETC in microgrid systems, to the best of the authors' knowledge, the use of ETC strategies for unbalanced voltage compensation has not been discussed, nor has the stability of ETC for unbalanced voltage compensation been demonstrated.

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  • Distributed control method for unbalanced voltage compensation of island alternating current microgrid
  • Distributed control method for unbalanced voltage compensation of island alternating current microgrid
  • Distributed control method for unbalanced voltage compensation of island alternating current microgrid

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Embodiment Construction

[0065] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0066] The invention proposes a distributed event-triggered control method for unbalanced voltage compensation in an islanded AC microgrid. Compared with the existing method, the control method proposed by the present invention can realize unbalanced voltage compensation, and meanwhile greatly reduce the exchange of communication data. Equipped with the control method proposed by the present invention, the microgrid system can realize the plug-and-play capability without affecting the compensation performance. The Lyapunov function verifies the stability of the control method proposed by the present invention. Experimental case studies demonstrate the effectiveness of the proposed scheme of the present invention.

[0067] In a three-phase islanded AC microgrid, such as figure 1 As shown, multiple DG units are connected in parallel to power lin...

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Abstract

The invention provides a distributed control method for unbalanced voltage compensation of an island alternating-current micro-grid without continuous communication, and solves the problem that voltage imbalance may occur in an alternating-current micro-grid system due to unbalanced load connection in a sensitive load bus (SLB). A new distributed control strategy provided by the invention is used for realizing unbalanced voltage compensation among distributed power generation units in the island alternating current micro-grid with limited discontinuous communication, a two-layer control framework is adopted and comprises a network layer and a main control layer, and the provided control strategy applied to the network layer realizes event-triggered communication, so that the communication efficiency is improved. Therefore, the unbalanced voltage in the SLB can be effectively compensated. Compared with a centralized control strategy, the provided control strategy is completely distributed, and information exchange between the DG units is only carried out when an event is triggered. The result is that the communication burden can be significantly reduced without affecting the control performance.

Description

technical field [0001] The invention relates to the technical field of direct current microgrid control, in particular to a distributed control method for unbalanced voltage compensation of an islanded alternating current microgrid without continuous communication. Background technique [0002] In recent years, distributed generation (DG) devices, such as solar, energy storage, and wind turbines, have been widely installed in distribution networks. In order to regulate multiple DG devices more efficiently, a microgrid concept of paralleling inverter-interfaced DG devices by employing cooperative control is proposed. [0003] However, with the increasing penetration of DG units into the microgrid, power quality problems such as voltage deviation, fluctuation, and unbalance may be detrimental to the stable operation of the microgrid system. Among these power quality issues, voltage imbalances at the Sensitive Load Bus (SLB) can lead to additional power losses and even stabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/50H02J3/48H02J3/16H02J3/28
CPCH02J3/388H02J3/381H02J3/50H02J3/48H02J3/16H02J3/28H02J2300/24H02J2300/28Y02E40/30
Inventor 李秀亮吕京航梁海谋
Owner 深圳市启点新能源科技有限公司
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