Micro-grid distributed secondary control clock synchronization method based on event triggering

Abstract

The invention discloses a micro-grid distributed secondary control clock synchronization method based on event triggering, and the method comprises the following steps: S1, building a local clock model of a distributed power supply, and introducing frequency and offset correction parameters to correct the clock model; S2, designing event triggering conditions, carrying out judgment at the local sampling moment, and sampling and transmitting local correction parameter information to neighbor nodes only when the triggering conditions are met; S3, based on a pinning consistency theory, optimally selecting a pinning clock and establishing a distributed clock synchronization protocol; and S4, determining a local sampling moment according to the corrected clock, establishing distributed secondary control of the micro-grid, and realizing synchronous information interaction among the distributed power supplies. According to the method, the clock synchronization problem in distributed secondary control is concerned, the local clock model of the distributed power supply is established, synchronous information interaction among the distributed power supplies is realized, better synchronous economy and higher synchronous convergence speed are achieved, and the system stability and convergence precision are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of micro-grid operation control, in particular to an event-triggered distributed secondary control clock synchronization method for a micro-grid. Background technique [0002] With the depletion of the earth's resources and people's attention to environmental issues, the access to renewable energy has attracted more and more attention from all over the world. Microgrid is an emerging energy transmission mode that increases the penetration rate of renewable energy and distributed energy in the energy supply system, and its components include different kinds of distributed energy resources (DER, including micro gas turbines, wind turbines, photovoltaic , fuel cells, energy storage equipment, etc.), user terminals of various electrical loads and / or thermal loads, and related monitoring and protection devices. [0003] The power supply inside the microgrid is mainly responsible for energy conversion by power el...

AI Technical Summary

Problems solved by technology

However, since the droop control is a proportional difference control, it will cause a steady-state deviation of the voltage, and the effect of reactive power distribution is not ideal. Therefore, secondary control is required to assist in voltage recovery and reactive power equalization

In the actual distributed structure, since there is no global centralized clock, the information update and transmission process of the secondary control will be triggered by the local clock. The amount of information obtained for control decisions will continue to be dislocated, which will introduce steady-state errors and even cause system instability

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