A double-layer control method for large-scale energy storage on the distribution network side to participate in frequency regulation

Abstract

The invention discloses a double-layer control method in which large-scale energy storage on the distribution network side participates in frequency regulation, and belongs to the technical field of power systems. Determine the switching timing of the two modes of ACE signal distribution and ARR signal distribution when the large-scale BESS participates in frequency modulation, and comprehensively consider the technical characteristics of different BESSs. The goal is to minimize the cost of frequency regulation. Within the allowable range of the technical characteristics of the frequency regulation power supply, the optimal distribution of the frequency regulation output of the unit and the BESS is carried out, and the economical optimal allocation result of the frequency regulation output is used as the output reference value of each frequency regulation power supply; the lower control (frequency Dynamic control) According to the frequency deviation of the system and the output reference value of the FM power supply provided by the power optimization distribution layer, the model predictive control is used to carry out distributed control of the unit and the BESS, so as to realize the dynamic optimal control of the FM power supply and reduce the system frequency deviation.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a double-layer control method in which large-scale energy storage on the distribution network side participates in frequency regulation. Background technique [0002] With the large-scale integration of renewable energy sources such as wind power and photovoltaics, the intermittent and uncertain output characteristics will put pressure on the frequency modulation of the power grid. As the main force of frequency regulation, traditional thermal power units face problems such as limited frequency regulation capacity, insufficient regulation accuracy and increased unit wear, which threaten the frequency security of the power grid and become one of the factors restricting the grid’s acceptance of renewable energy. In recent years, Battery Energy Storage System (BESS) has been gradually favored by Automatic Generation Control (AGC) due to its fast response speed and hig...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of unreasonable signal distribution under the two modes of ARR and ACE in the existing frequency modulation control method, the present invention proposes a two-layer control method in which large-scale energy storage on the distribution network side participates in frequency modulation, and determines the large-scale BESS When participating in frequency modulation, the switching timing of the two modes of ACE signal distribution and ARR signal distribution, while fully considering the technical characteristics of different BESSs, realizes optimal power distribution under multiple constraints based on the power supply cost function in the upper layer, and based on model predictive control in the lower layer ( Model Predictive Control, MPC) realizes frequency distributed optimal control, making full use of the advantages of the two signal distribution modes

Images