A control method for transient energy transfer of power system with hybrid energy storage

Abstract

The invention discloses a control method for transient energy transfer of a power system with hybrid energy storage, comprising the following steps: performing small disturbance analysis on a power system with a transient energy transfer controller added, obtaining the system characteristic equation, and defining the power angle Attenuation speed: Divide the power angle oscillation cycle of the system into two stages: power angle offset and power angle recovery; judge whether the decay speed in the power angle offset stage decreases, if yes, continue to judge whether the decay speed in the power angle recovery stage increases , yes, continue to judge whether the transient energy of the system is reduced after adding the transient energy transfer controller, yes, the transient energy transfer controller improves the transient stability of the system, end. The transient energy transfer control method of the power system with hybrid energy storage provided by the present invention can reduce the accumulation of system acceleration energy, increase the conversion of deceleration energy, and transfer synchronous generators by adding a transient energy transfer controller to the system. The transient energy withstood can significantly improve the transient stability of the system.

Description

technical field [0001] The invention relates to the technical field of power generation system control, in particular to a method for controlling transient energy transfer of a power system with hybrid energy storage. Background technique [0002] At present, large-scale photovoltaic power generation replaces traditional generators and integrates into the grid to alleviate the pressure on fossil energy, but it also poses new challenges to the stable operation of the power system. In addition to the random fluctuation of photovoltaic output that disturbs the stable operation of the power system, the reduction of system inertia caused by static photovoltaic components is the main reason that limits the ability of the power system to cope with frequency modulation and power oscillation. Using static hybrid energy storage equipment to achieve synchronous coupling operation with the system can provide a moment of inertia greater than that of synchronous generators in a short peri...

AI Technical Summary

Problems solved by technology

However, in the subsequent frequency recovery period, the constant inertial response will still maintain the control function of suppressing frequency changes, prolonging the system frequency recovery time

Not only that, but in the recovery process of the system oscillation, the decay speed of the power angle will also be reduced due to the increase of the additional inertia, thus prolonging the system oscillation time

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