Transient energy transfer control method for power system containing hybrid energy storage

Abstract

The invention discloses a transient energy transfer control method for a power system containing hybrid energy storage, and the method comprises the following steps: carrying out the small-disturbanceanalysis of the power system with an additional transient energy transfer controller, obtaining a system characteristic equation, and defining a power angle attenuation speed; dividing a power angleoscillation period of the system into two stages of power angle offset and power angle recovery; judging whether the attenuation speed of the power angle offset stage is reduced or not, if yes, continuing to judge whether the attenuation speed of the power angle recovery stage is increased or not, if yes, continuing to judge whether the system transient energy is reduced or not after the transientenergy transfer controller is added, and if yes, improving the system transient stability and ending by the transient energy transfer controller, and finishing the steps. According to the transient energy transfer control method for the electric power system containing the hybrid energy storage function, the transient energy transfer controller is additionally arranged in the system, accumulationof acceleration energy of the system can be reduced, conversion of deceleration energy is increased, transient energy borne by the synchronous generator is transferred, and therefore the transient stability of the system is remarkably improved.

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...

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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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