Microgrid autonomous control method based on system health status assessment and reference to csma/cd mechanism

Abstract

The invention discloses a CSMA / CD-mechanism-referred micro-grid autonomous control method based on system health status evaluation. The CSMA / CD-mechanism-referred micro-grid autonomous control method does not depend on an MGCC and communication, and a flat control strategy of coordinated running of source units, storage units and load units of a micro-grid can be achieved. The CSMA / CD-mechanism-referred micro-grid autonomous control method is formed by two core sub-strategies including the micro-grid hierarchical control strategy based on the system health status evaluation and the micro-grid time-shared control strategy referring to a CSMA / CD mechanism, and modules including the micro-grid system health status evaluation model module, the energy-storage double-quadrant self-adaptive drooping algorithm module, the load discretization mirroring drooping algorithm module and the like are contained. The units of the CSMA / CD-mechanism-referred micro-grid autonomous control method can accurately identity the system running status according to the local system health status, system adjustment is dynamically started / stopped, and stable running of the micro-grid is maintained.

Description

technical field [0001] The invention belongs to the micro-grid coordinated operation control technology, and relates to the autonomous operation of distributed power sources, multi-energy storage and controllable loads in the micro-grid, and in particular to a flat grid that does not depend on MGCC and communication and realizes the coordinated and autonomous operation of each unit of the micro-grid. control strategy. Background technique [0002] With the in-depth study of renewable energy generation and distributed energy storage, the sharing of green energy through the "Energy Internet" has become an inevitable trend in the development of smart grids. Among them, the Energy Internet is open and requires the realization of unit flat control and plug-and-play functions, which has important guiding significance for the research on the coordinated control of microgrid units. [0003] At present, the research hotspots on the realization of the "plug and play" function of each...

AI Technical Summary

Problems solved by technology

However, the addition of virtual impedance will affect the accuracy of the system voltage. Although the latter solution can reduce current circulation and frequency oscillation, the dynamic response of the system is poor. It is difficult to determine the system parameters due to the diverse units in the complex microgrid. Implementation It is difficult, and at the same time, the research on droop control algorithm suitable for distributed energy storage characteristics and how to realize the coordination control strategy of microgrid without communication is not deep enough

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