DOI:10.35833/MPCE.2020.000413 |
| |
| |
Connection Between Damping Torque Analysis and Energy Flow Analysis in Damping Performance Evaluation for Electromechanical Oscillations in Power Systems |
| |
|
| |
Page view: 199
Net amount: 782 |
| |
Author:
Yong Hu1,2,Siqi Bu1,2,Xin Zhang3,Chi Yung Chung4,Hui Cai5
|
Author Affiliation:
1.Department of Electrical Engineering and Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hong Kong, China;2.Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, China;3.Centre for Energy Systems and Strategy, Cranfield University, Cranfield, UK;4.Department of Electrical and Computer Engineering, University of Saskatchewan, Saskatoon, Canada;5.State Grid Jiangsu Economic Research Institute, Nanjing, China
|
Foundation: |
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). |
|
|
Abstract: |
The damping performance evaluation for electromechanical 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. |
Keywords: |
Electromechanical oscillation ; damping performance ; damping torque analysis (DTA) ; energy flow analysis (EFA) ; frequency spectrum |
| |
Received:June 28, 2020
Online Time:2022/01/28 |
| |
|
|
View Full Text
Download reader
|
|
|