Modeling formulation and validation for accelerated simulation and flexibility assessment on large scale power systems under higher renewable penetrations
•Novel formulation of unit commitment model for large-scale power system simulation.•Validated with standard test system and applied to real regional systems in China.•Increase the computational speed by more than 20,000 times with ∼1% error.•Can be applied to planning issues, e.g. optimal sizing of...
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| Published in | Applied energy Vol. 237; pp. 145 - 154 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier Ltd
01.03.2019
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| Abstract | •Novel formulation of unit commitment model for large-scale power system simulation.•Validated with standard test system and applied to real regional systems in China.•Increase the computational speed by more than 20,000 times with ∼1% error.•Can be applied to planning issues, e.g. optimal sizing of wind, solar and hydro.
Deploying high penetration of variable renewables represents a critical pathway for decarbonizing the power sector. Hydro power (including pumped-hydro), batteries, and fast responding thermal units are essential in providing system flexibility at elevated renewable penetration. How to quantify the merit of flexibility from these sources in accommodating variable renewables, and to evaluate the operational costs considering system flexibility constraints have been central challenges for future power system planning. This paper presents an improved linear formulation of the unit commitment model adopting unit grouping techniques to expedite evaluation of the curtailment of renewables and operational costs for large-scale power systems. All decision variables in this formulation are continuous, and all chronological constraints are formulated subsequently. Tested based on actual data from a regional power system in China, the computational speed of the model is more than 20,000 times faster than the rigorous unit commitment model, with less than 1% difference in results. Hourly simulation for an entire year takes less than 3 min. The results demonstrate strong potential to apply the proposed model to long term planning related issues, such as flexibility assessment, wind curtailment analysis, and operational cost evaluation, which could set a methodological foundation for evaluating the optimal combination of wind, solar and hydro investments. |
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| AbstractList | •Novel formulation of unit commitment model for large-scale power system simulation.•Validated with standard test system and applied to real regional systems in China.•Increase the computational speed by more than 20,000 times with ∼1% error.•Can be applied to planning issues, e.g. optimal sizing of wind, solar and hydro.
Deploying high penetration of variable renewables represents a critical pathway for decarbonizing the power sector. Hydro power (including pumped-hydro), batteries, and fast responding thermal units are essential in providing system flexibility at elevated renewable penetration. How to quantify the merit of flexibility from these sources in accommodating variable renewables, and to evaluate the operational costs considering system flexibility constraints have been central challenges for future power system planning. This paper presents an improved linear formulation of the unit commitment model adopting unit grouping techniques to expedite evaluation of the curtailment of renewables and operational costs for large-scale power systems. All decision variables in this formulation are continuous, and all chronological constraints are formulated subsequently. Tested based on actual data from a regional power system in China, the computational speed of the model is more than 20,000 times faster than the rigorous unit commitment model, with less than 1% difference in results. Hourly simulation for an entire year takes less than 3 min. The results demonstrate strong potential to apply the proposed model to long term planning related issues, such as flexibility assessment, wind curtailment analysis, and operational cost evaluation, which could set a methodological foundation for evaluating the optimal combination of wind, solar and hydro investments. |
| Author | Wen, Jinyu Han, Xingning Nielsen, Chris P. McElroy, Michael B. Liao, Shiwu Chen, Xinyu |
| Author_xml | – sequence: 1 givenname: Xingning surname: Han fullname: Han, Xingning organization: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China – sequence: 2 givenname: Xinyu orcidid: 0000-0001-5816-8621 surname: Chen fullname: Chen, Xinyu email: xchen@seas.harvard.edu organization: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China – sequence: 3 givenname: Michael B. surname: McElroy fullname: McElroy, Michael B. email: mbm@seas.harvard.edu organization: School of Engineering and Applied Sciences and Harvard China Project, Harvard University, Cambridge, MA 02138, United States – sequence: 4 givenname: Shiwu orcidid: 0000-0003-4057-2831 surname: Liao fullname: Liao, Shiwu organization: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, State Grid Jiangsu Electric Power Research Institute, Nanjing 211103, China – sequence: 5 givenname: Chris P. surname: Nielsen fullname: Nielsen, Chris P. email: nielsen2@fas.harvard.edu organization: School of Engineering and Applied Sciences and Harvard China Project, Harvard University, Cambridge, MA 02138, United States – sequence: 6 givenname: Jinyu surname: Wen fullname: Wen, Jinyu email: jinyu.wen@hust.edu.cn organization: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Title | Modeling formulation and validation for accelerated simulation and flexibility assessment on large scale power systems under higher renewable penetrations |
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