Drooping characteristic-based mode adaptive voltage source control method applied to microgrid

Abstract

The invention discloses a drooping characteristic-based mode adaptive voltage source control method applied to a microgrid. The method is composed of improved drooping control under an islanding condition, micro-grid double-mode smooth switching control and improved drooping control under a networked state; an amplitude limiting link and a virtual inertia link are added to P-f type drooping control, so that parallel stable operation of a plurality of dropping control type micro-sources of the microgrid which operate under an islanding condition can be realized; PI adjustment is performed on the phase angle deviation and voltage amplitude deviation of an external grid and the microgrid, so that pre-synchronization frequency deviation control signal and voltage deviation control signals can be obtained; after receiving the frequency deviation control signal and voltage deviation control signals which are issued by a microgrid pre-synchronization control system, micro-source inverters perform control according to a signal translation active power droop curve and reactive power droop curve; and connection line power control is increased, adjustment is performed according to an active power reference deviation value and a reactive power reference deviation value, and reference active power reference signals and reference reactive power reference signals are obtained, and control is performed according to the signal translation active power droop curve and reactive power droop curve.

Description

[0001] Technical field: [0002] The invention relates to a mode adaptive voltage source control method based on droop characteristics in a microgrid, belonging to the technical field of microgrid operation and control. [0003] Background technique: [0004] The traditional mode-adaptive voltage source control method with drooping characteristics has weak inverter overcurrent capability, fast frequency response, cannot run in parallel with synchronous motor-type micro-sources, and cannot flexibly realize on-off grid state switching and tie lines Disadvantages such as power control. [0005] Invention content: [0006] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a mode-adaptive voltage source control method based on the droop characteristic in the micro-grid, which is applicable to the micro-grid network and inverter-type inverters with various operating modes The improved droop control strategy of ...

AI Technical Summary

Problems solved by technology

[0009] The improved droop control in the island state: In view of the shortcomings of traditional droop control inverters such as weak overcurrent capability, fast frequency response, and inability to operate in parallel with synchronous motor type micro-sources, the P-f type droop control is improved. Limiting and virtual inertia link to realize the parallel and stable operation of multi-droop control micro-sources in the island operation state of the micro-grid;

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