Validation of Positive-Sequence Modeling of Large-Disturbance Stability in a Distribution Network With Distributed Generation Using the Hybrid Comprehensive Simulator

Aleksey A Suvorov,Alisher B Askarov,Mikhail V Andreev,Alexander S Gusev

doi:10.1109/access.2021.3076219

Aleksey A Suvorov, Alisher B Askarov + Show 2 more

Open Access

https://doi.org/10.1109/access.2021.3076219

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Abstract

One of the general trends in power industry is the penetration of distributed generation (DG) units. The ongoing transformation of electric power systems (EPS) due to this penetration leads to a significant change in the properties of power systems. The problem arises in the ensuring stability of distribution system with DG units and EPS as a whole, especially in the case of large disturbances. The main way of solving this problem is positive-sequence phasor time-domain simulation. However, the known simplifications and limitations are inevitably applied at such simulation. In this regard, the obtained simulation results need to be validated. This paper proposes an alternative approach for validation of processes calculations, based on the use of a benchmark tool instead of field data. The hybrid simulator is proposed to use as a benchmark tool, because such simulator allow to obtain comprehensive information about a single spectrum of wave, electromagnetic, electromechanical processes in power system in cases of different large disturbances. That makes possible to identify the impact of the applied simplifications and limitations in the positive-sequence simulation on the reliability of power system stability assessment in the case of large disturbances. The studies presented in this paper were carried out using the scheme of distribution system with DG units, which is part of a real EPS. The obtained results demonstrate the arising errors in stability calculations, the nature of their changing and causes of occurrence, as well as factors affecting them.

Highlights

One of the main directions of development and enhancement of electric power systems (EPS) is the penetration of distributed generation (DG) units
The authors of this paper developed an alternative approach based on the use of a comprehensive information obtained via a benchmark tool to carry out the cross-validation of stability calculations of distribution systems with DG units
EXPERIMENTAL RESULTS Since for the distribution system with DG units, the operation of their automatic control systems (ACS) is decisive from the point of view of a largedisturbance stability, the experimental studies were carried out in accordance with an approach that assumes a sequential complication of the EPS’ mathematical model by adding ACSs

Summary

INTRODUCTION

One of the main directions of development and enhancement of electric power systems (EPS) is the penetration of distributed generation (DG) units. This is clearly not enough to carry out a comprehensive and reliable analysis of the stability of modern distribution networks with DG and, to develop a reliable control of such grids, in which the penetration level of DG and its impact on the stability continue to increase In this regard, the cross-validation of stability calculations via STs for distribution systems with DG units as a part of largescale EPS is an important step towards ensuring the security operation of power systems. The cross-validation is considered in relation to one of the main and most difficult challenges due to its nonlinear nature and rate of processes – ensuring the stability of the distribution systems with DG units, operating in parallel with the external transmission grid in the case of a large disturbance. Obtained by digital multiprocessors simulators results can be considered reliable for small schemes and make comparison with them

POWER SYSTEM MODELING

EXPERIMENTAL RESULTS

CONCLUSION