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Modeling frequency dynamics in unit commitment with a high share of renewable energy
- Publication Year :
- 2020
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2020.
-
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.
- Subjects :
- Frequency response
Energy
Maximum power principle
Computer science
020209 energy
Automatic frequency control
Energy Engineering and Power Technology
02 engineering and technology
Electric power system
0906 Electrical and Electronic Engineering
Variable renewable energy
Power system simulation
Margin (machine learning)
Control theory
0202 electrical engineering, electronic engineering, information engineering
Piecewise
Electrical and Electronic Engineering
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....9f78c033555866e94f34de61a65570ca