Modeling frequency dynamics in unit commitment with a high share of renewable energy
Author(s)
Zhang, Ziyang
Du, Ershun
Teng, Fei
Zhang, Ning
Kang, Chongqing
Type
Journal Article
Abstract
The power system inertia is gradually decreasing with the growing share of variable renewable energy (VRE). This may jeopardize the frequency dynamics and challenges the secure operation of power systems. In this paper, the concept of frequency security margin is proposed to quantify the system frequency regulation ability under contingency. It is defined as the maximum power imbalance that the system can tolerate while keeping frequency within the tolerable frequency range. A frequency constrained unit commitment (FCUC) model considering frequency security margin is proposed. Firstly, the analytical formulation of system frequency nadir is derived while considering both the frequency regulation characteristics of the thermal generators and the frequency support from VRE plants. Then, the frequency security margin is analytically formulated and piecewise linearized. A novel FCUC model is proposed by incorporating linear frequency security constraints into the traditional unit commitment model. Case studies on a modified IEEE RTS-79 system and HRP-38 system are provided to verify the effectiveness of the proposed FCUC model. The impacts of VRE penetration on system frequency security are analyzed using frequency security margin.
Date Issued
2020-05-22
Date Acceptance
2020-05-17
Citation
IEEE Transactions on Power Systems, 2020, 35 (6), pp.4383-4395
ISSN
0885-8950
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Start Page
4383
End Page
4395
Journal / Book Title
IEEE Transactions on Power Systems
Volume
35
Issue
6
Copyright Statement
© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor
Economic & Social Research Council (ESRC)
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://ieeexplore.ieee.org/document/9099053
Grant Number
ES/T000112/1
EP/T021780/1
Subjects
0906 Electrical and Electronic Engineering
Energy
Publication Status
Published
Date Publish Online
2020-05-22