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Island microgrid distributed coordination control method considering communication problem

A technology of distributed coordination and control method, which is applied in the field of distributed coordination and control of island microgrids, and can solve problems such as being insufficient to meet the random changes of microgrid systems.

Active Publication Date: 2019-12-24
YANSHAN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

In distributed coordinated control, the controller of each DER only communicates with neighboring DERs, and does not require a central controller, which improves the robustness of the system, but it is not enough to meet various random changes in the microgrid system.

Method used

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  • Island microgrid distributed coordination control method considering communication problem
  • Island microgrid distributed coordination control method considering communication problem
  • Island microgrid distributed coordination control method considering communication problem

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Embodiment

[0131] Taking the i-th DER as an example, the present invention adopts a hierarchical control structure, which is divided into an information layer and a physical layer. The physical layer mainly includes the outer loop improved droop controller, the inner loop voltage / current controller, the secondary control link, the power calculation link, the voltage synthesis link and the PWM signal generator. The information layer includes a centralized event-triggered consensus protocol under topology transformation, a communication interruption processing module, a data prediction and compensation link, and a communication network composed of sensors. This layer is responsible for global voltage / frequency adjustment based on information interaction with adjacent agents. And the power is equally divided, and finally acts on the primary control.

[0132] First, the inverter output voltage U o and current I o , the two get the components on the d-axis and q-axis through the Park link, ...

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Abstract

The invention provides an island microgrid distributed coordination control method considering a communication problem. Based on distributed information and in consideration of the actual communication problem encountered in the information transmission process, the stability control problem of the frequency and the voltage of the AC microgrid under off-network autonomy is effectively solved, andthe system instability caused by excessive fluctuation of centralized communication pressure and frequency voltage and communication interruption is avoided. A droop controller is designed, and the dynamic performance of the frequency and the voltage is optimized. In secondary control, a centralized event trigger consistency protocol is introduced, communication resources are saved, irregular switching of a network topology structure is considered, a data compensation mechanism is designed under a communication interruption fault, and a scheme of combining neighbor data compensation and centralized data compensation is adopted; and on the aspect of data prediction, an improved exponential smoothing model based on a time sequence is provided, and finally secondary adjustment of the frequency and the voltage is achieved.

Description

technical field [0001] The present invention relates to the technical field of smart grid control, in particular to a distributed coordination control method for an isolated island microgrid considering communication issues. Background technique [0002] In recent years, developing clean energy and ensuring energy security have become the core contents of the energy field. Distributed power sources such as wind power generation and photovoltaic power generation have been greatly developed due to their advantages such as low investment, flexible power generation methods, and good environmental protection effects. Due to the different types of distributed power sources, different ownership, large quantity and scattered, it is difficult to directly connect to the distribution network, so the concept of micro-grid is proposed. Microgrid is an autonomous system with two operating modes: grid-connected and islanded. Under grid-connected operation, the voltage and frequency of th...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/46
Inventor 窦春霞赵朋岳东张占强张博张立国
Owner YANSHAN UNIV
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