Abstract
With the increasing application of battery energy storage in the power grid, there will be inevitably a large number of battery energy storage systems (BESS) in the future distribution network. It is very important to study the equivalent model of BESS which is suitable for comprehensive load modelling. In this paper, the battery group is established based on a type of general battery model, and then, a simulation platform of BESS based on MATLAB/Simulink is constructed, using a double closed loop control strategy with constant power as control object. Through the simulation analysis of grid-connected characteristics of BESS, a semi-mechanism dynamic model of BESS based on the external characteristic equivalent is proposed. This model represents the variation trend of the electrical variables of BESS during transient state, and considers the inertia characteristics of the BESS relative to power grid. By comparing the simulation results under different disturbance intensity, the proposed model can describe the transient characteristics of BESS, and can meet the performance requirements of the load modelling for the distribution network side.
Highlights
With the development of economy and society, on the one hand, the electricity demand is increasing continually and has obvious time characteristics, which make the peak-valley difference further expand
On the basis of the existing results, this paper studies the battery energy storage systems (BESS) dynamic model for the generalized load model for the distribution network side
It is very important for accurate simulation of power system to study the dynamic model of BESS which is suitable for the generalized load modeling for the distribution network side
Summary
With the development of economy and society, on the one hand, the electricity demand is increasing continually and has obvious time characteristics, which make the peak-valley difference further expand. In the study of power system, load model has an important influence on the stability analysis of power system [4] Since other models such as generator and transformer have been mature, the generalized load model considering the dynamic characteristics of BESS has become a key factor in the accuracy of power grid simulation results to the distribution network with BESS. On the basis of the existing results, this paper studies the BESS dynamic model for the generalized load model for the distribution network side. The dynamic behavior of grid-connected BESS is analyzed and its main features are extracted On this basis, a dynamic model of BESS is proposed, which is suitable for generalized load modeling for the distribution network side.
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