Open Access

ARTICLE

Electromechanical Transient Modeling Analysis of Large-Scale New Energy Grid Connection

Shichao Cao^*, Yonggang Dong, Xiaoying Liu

Department of Electrical Engineering, Hebei Vocational University of Technology and Engineering, Xingtai, 054000, China

* Corresponding Author: Shichao Cao. Email:

(This article belongs to the Special Issue: Renewable Energy Technologies for Sustainable Energy Production)

Energy Engineering 2024, 121(4), 1109-1125. https://doi.org/10.32604/ee.2023.043004

Received 19 June 2023; Accepted 08 August 2023; Issue published 26 March 2024

Abstract

The synchronous virtual machine uses inverter power to imitate the performance of the conventional synchronous machine. It also has the same inertia, damping, frequency, voltage regulation, and other external performance as the generator. It is the key technology to realize new energy grid connections’ stable and reliable operation. This project studies a dynamic simulation model of an extensive new energy power system based on the virtual synchronous motor. A new energy storage method is proposed. The mathematical energy storage model is established by combining the fixed rotor model of a synchronous virtual machine with the charge-discharge power, state of charge, operation efficiency, dead zone, and inverter constraint. The rapid conversion of energy storage devices absorbs the excess instantaneous kinetic energy caused by interference. The branch transient of the critical cut set in the system can be confined to a limited area. Thus, the virtual synchronizer’s kinetic and potential energy can be efficiently converted into an instantaneous state. The simulation of power system analysis software package (PSASP) verifies the correctness of the theory and algorithm in this paper. This paper provides a theoretical basis for improving the transient stability of new energy-connected power grids.

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