Distributed control method considering delay and packet loss in microgrid under cps concept

A distributed power and problem technology, applied in the direction of AC network circuit, single-network parallel feeding arrangement, system integration technology, etc., can solve the problem that the voltage value and angular frequency value of the micro-grid system cannot reach the expected reference value, etc. Achieve the effect of solving time delay and packet loss problems, reducing control time, and eliminating control errors

Active Publication Date: 2021-01-08
YANSHAN UNIV
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  • Application Information

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Problems solved by technology

Simple droop control cannot achieve the expected reference value for the voltage value and angular frequency value of the microgrid system

Method used

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  • Distributed control method considering delay and packet loss in microgrid under cps concept
  • Distributed control method considering delay and packet loss in microgrid under cps concept
  • Distributed control method considering delay and packet loss in microgrid under cps concept

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Embodiment Construction

[0026]The present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0027]The present invention is a distributed control method that considers time lag and packet loss in a micro network based on the CPS concept, and its content is as follows:

[0028]Step 1: Analyze the information flow transfer in the communication system based on the concept of CPS and graph theory, and construct a mathematical model of communication system traffic.

[0029]The specific implementation process of step 1:

[0030]1. CPS concept:

[0031]Cyber-Physical Convergence System (CPS) is a combination of communication system and physical system. It is a complex system, including computing decision-making equipment, communication system and physical system. Its real-time data perception, dynamic control and information service functions are realized through deep 3C (control, calculation, communication) cooperation.

[0032]2. Introduction to Graph Theory:

[0033]The topolog...

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Abstract

The invention divides a microgrid control structure into a communication system and a physical system based on the concept of an information physical fusion system, and a novel distributed control strategy is proposed on this structure to improve a control effect of voltage and angular frequency by traditional droop control. Firstly, a microgrid communication system model is proposed based on graph theory knowledge, and communication structures of a plurality of single distributed power supplies form an integral communication system; secondly, in the communication system, a method combining areverse neural network and prediction control is proposed to solve the problem of communication time lag; a novel consistency protocol with a virtual navigator is proposed to solve the problem of packet loss; thirdly, in the physical system, P-omega / Q-U droop control is used as primary control of voltage and angular frequency; and finally, voltage and angular frequency data in the communication system and the proposed novel consistency protocol are utilized to complete secondary control of voltage and angular frequency output by droop control in the physical system, and the control strategy has a distributed cooperative characteristic.

Description

Technical field[0001]The invention belongs to the field of smart grid control, and specifically relates to a design method for a distributed coordinated control strategy in a microgrid under the concept of CyberPhysical Systems (CyberPhysical Systems, CPS) and considering communication time lag and packet loss issues.Background technique[0002]Cyber-physical fusion system is a combination of communication system and physical system. It is a complex system, including computing decision-making equipment, communication system and physical system. It has functions such as real-time perception, dynamic control and providing information services for large engineering systems. These functions are obtained through organic integration and in-depth cooperation of control technology, computing technology, and communication technology. CPS is a next-generation engineering system with broad industrial application prospects. However, in the communication system, there will be problems of time lag ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J13/00
CPCH02J13/0013H02J3/381H02J2203/20Y02E40/70Y04S10/12Y04S10/40Y04S10/50
Inventor 窦春霞张博王瑞山孟驰华张亚民
Owner YANSHAN UNIV
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