System oscillation suppression method and device based on energy storage virtual synchronous power generation technology

Abstract

The invention provides a system oscillation suppression method based on an energy storage type virtual synchronous power generation technology, which comprises the steps of setting a static parameterJ / D and a transient control strategy trigger power deviation threshold according to physical constraints and equipment operation constraints of an energy storage type virtual synchronous power generation unit based on a pre-established single virtual synchronous generator transient parameter dynamic adjustment control model; and if the power deviation exceeds the threshold, starting a transient control strategy in the single virtual synchronous generator transient parameter dynamic adjustment control model, and respectively setting the corresponding static parameter J / D values according to three sections in the transient process so as to shorten the transient process and the system oscillation overshoot. The control method provided by the invention has the advantages of high tracking speed, small overshoot, ability of obviously suppressing the oscillation amplitude and shortening the transient process and ability of bringing the advantages of flexible and adjustable inertia and dampingcoefficient of virtual synchronous generators into full play, and thus gives play to the oscillation suppression ability of the energy storage type virtual synchronous power generation equipment.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a system oscillation suppression method and device based on energy storage virtual synchronous power generation technology. Background technique [0002] As the penetration rate of thermal power units decreases, the ability to suppress low-frequency oscillations on the power generation side of the system is weakened. The large-scale, high-penetration, and high-density access of distributed power generation (DG) has made power electronic equipment based on inverter grid-connected interfaces widely used. However, power electronic devices do not have the characteristics of rigid body moment of inertia. When a small disturbance occurs in the system and there is a power shortage, the DG unit cannot provide additional power dynamic support; and conventional rotating generators can respond in real time due to their large moment of inertia. Should process. In order to cope with the...

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Problems solved by technology

However, power electronic devices do not have the characteristics of rigid body moment of inertia. When a small disturbance occurs in the system and there is a power shortage, the DG unit cannot provide additional power dynamic support; and conventional rotating generators can respond in real time due to their large moment of inertia. should process

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