A Clock Synchronization Method for Distributed Secondary Control of Microgrid Based on Event Triggering

Abstract

The invention discloses an event-triggered distributed secondary control clock synchronization method for a microgrid, comprising the following steps: S1, establishing a local clock model of a distributed power supply, and introducing frequency and offset correction parameters to correct the clock model; S2, designing The event triggers the condition and judges it at the local sampling time. Only when the trigger condition is met, the local correction parameter information is sampled and transmitted to the neighbor node; S3. Based on the pinning consistency theory, optimize the selection of the pinning clock and establish a distributed clock synchronization protocol; S4. Determine the local sampling time according to the corrected clock, establish the distributed secondary control of the microgrid, and realize the synchronous information interaction between distributed power sources. The present invention pays attention to the clock synchronization problem in the distributed secondary control, establishes the local clock model of the distributed power supply, realizes the synchronization information interaction among the distributed power supplies, has better synchronization economy and faster synchronization convergence speed, and effectively improves System stability and convergence accuracy.

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

Images