TY - JOUR
T1 - Connection between Damping Torque Analysis and Energy Flow Analysis in Damping Performance Evaluation for Electromechanical Oscillations in Power Systems
AU - Hu, Yong
AU - Bu, Siqi
AU - Zhang, Xin
AU - Chung, Chi Yung
AU - Cai, Hui
N1 - Funding Information:
This work was supported in part by the National Natural Science Foundation of China (No. 51807171), the Guangdong Science and Technology Department (No. 2019A1515011226), the Hong Kong Research Grant Council (No. 15200418), and the Department of Electrical Engineering, The Hong Kong Polytechnic University for the Start-up Fund (No. 1-ZE68).
Publisher Copyright:
© 2013 State Grid Electric Power Research Institute.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - The damping performance evaluation for electro-mechanical oscillations in power systems is crucial for the stable operation of modern power systems. In this paper, the connection between two commonly-used damping performance evaluation methods, i.e., the damping torque analysis (DTA) and energy flow analysis (EFA), are systematically examined and revealed for the better understanding of the oscillatory damping mechanism. First, a concept of the aggregated damping torque coefficient is proposed and derived based on DTA of multi-machine power systems, which can characterize the integration effect of the damping contribution from the whole power system. Then, the pre-processing of measurements at the terminal of a local generator is conducted for EFA, and a concept of the frequency-decomposed energy attenuation coefficient is defined to screen the damping contribution with respect to the interested frequency. On this basis, the frequency spectrum analysis of the energy attenuation coefficient is employed to rigorously prove that the results of DTA and EFA are essentially equivalent, which is valid for arbitrary types of synchronous generator models in multi-machine power systems. Additionally, the consistency between the aggregated damping torque coefficient and frequency-decomposed energy attenuation coefficient is further verified by the numerical calculation in case studies. The relationship between the proposed coefficients and the eigenvalue (or damping ratio) is finally revealed, which consolidates the application of the proposed concepts in the damping performance evaluation.
AB - The damping performance evaluation for electro-mechanical oscillations in power systems is crucial for the stable operation of modern power systems. In this paper, the connection between two commonly-used damping performance evaluation methods, i.e., the damping torque analysis (DTA) and energy flow analysis (EFA), are systematically examined and revealed for the better understanding of the oscillatory damping mechanism. First, a concept of the aggregated damping torque coefficient is proposed and derived based on DTA of multi-machine power systems, which can characterize the integration effect of the damping contribution from the whole power system. Then, the pre-processing of measurements at the terminal of a local generator is conducted for EFA, and a concept of the frequency-decomposed energy attenuation coefficient is defined to screen the damping contribution with respect to the interested frequency. On this basis, the frequency spectrum analysis of the energy attenuation coefficient is employed to rigorously prove that the results of DTA and EFA are essentially equivalent, which is valid for arbitrary types of synchronous generator models in multi-machine power systems. Additionally, the consistency between the aggregated damping torque coefficient and frequency-decomposed energy attenuation coefficient is further verified by the numerical calculation in case studies. The relationship between the proposed coefficients and the eigenvalue (or damping ratio) is finally revealed, which consolidates the application of the proposed concepts in the damping performance evaluation.
KW - damping performance
KW - damping torque analysis (DTA)
KW - Electromechanical oscillation
KW - energy flow analysis (EFA)
KW - frequency spectrum
UR - http://www.scopus.com/inward/record.url?scp=85124126357&partnerID=8YFLogxK
U2 - 10.35833/MPCE.2020.000413
DO - 10.35833/MPCE.2020.000413
M3 - Journal article
AN - SCOPUS:85124126357
SN - 2196-5625
VL - 10
SP - 19
EP - 28
JO - Journal of Modern Power Systems and Clean Energy
JF - Journal of Modern Power Systems and Clean Energy
IS - 1
M1 - 9356483
ER -