Control strategy for assisting new energy power station to participate in system frequency modulation through energy storage

Abstract

The invention discloses a control strategy for assisting a new energy power station to participate in system frequency modulation through energy storage, and belongs to electric power generation field, the invention aims to provide a control strategy with advantages of inertia control and droop control, and different control strategies can be adopted to adjust the output of the energy storage system in different time periods of frequency modulation; the method comprises the following steps: (1) dividing system frequency change into different time periods: recording a moment when the system frequency fluctuates and exceeds an allowable range as t0, recording a moment when the frequency fluctuation reaches a maximum value as tm, and recording a moment when the frequency gradually recovers toa normal range as ts; (2) taking t0 as a moment when energy storage starts to participate in primary frequency modulation, and adopting inertia control to participate in power grid frequency modulation in energy storage based on an inertia control model at a stage from t0 to tm; and in the tm to ts stages, converting the control mode of energy storage into droop control from inertia control. Theoutput of the energy storage system can be adjusted by adopting different control strategies in different frequency modulation periods, and the frequency modulation effect is better by shortening thefrequency response time of the system.

Description

technical field [0001] The invention belongs to the technical field of power system frequency modulation, and in particular relates to a control strategy for energy storage-assisted new energy power stations to participate in system frequency modulation. Background technique [0002] With the continuous development of society and the improvement of people's awareness of environmental protection, the grid connection of large-capacity new energy power stations has become the norm. Due to the intermittent and uncertain characteristics of the output of new energy power generation, it will have various impacts on the system after being connected to the grid. [0003] details as follows: [0004] (1) The pace of electricity demand and installed capacity growth is inconsistent [0005] (2) Unreasonable power supply structure leads to insufficient system adjustment ability [0006] (3) The development of the power grid is unbalanced, and the implementation of relevant policies st...

AI Technical Summary

Problems solved by technology

[0004] (1) The pace of electricity demand and installed capacity growth is inconsistent

[0005] (2) Unreasonable power supply structure leads to insufficient system adjustment ability

[0006] (3) The development of the power grid is unbalanced, and the implementation of relevant policies still needs to be improved

[0007] (4) The fluctuating characteristics of new energy sources bring about the problem of power grid frequency regulation

But in the literature that has been read, there are relatively few methods that combine two or more control strategies

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