Low Carbon Economic Dispatch of Integrated Energy System Considering Power-to-Gas Heat Recovery and Carbon Capture
Abstract
:1. Introduction
2. Electricity–Gas–Heat Integrated Energy System Model
2.1. P2G Model
2.2. CHP Model
3. Low-Carbon Economic Dispatch of Integrated Energy System Considering P2G Heat Recovery and Carbon Capture
3.1. Carbon Capture System Model
3.2. Carbon Trading Model
3.2.1. Carbon Trading Quota
3.2.2. Ladder-Type Carbon Trading Mechanism
3.3. Objective Function
3.3.1. Operating Cost of Coal-Fired Units
3.3.2. Start and Stop Costs
3.3.3. Gas Purchase Cost
3.3.4. Cost of Wind Abandonment
3.3.5. Carbon Purchase Cost
3.4. Constraints
3.4.1. Power Flow Constraints
- (1)
- Constraints on node power balance
- (2)
- Constraints on upper and lower limits of unit power
- (3)
- Minimum start–stop time constraints
- (4)
- Constraint on unit climbing rate
- (5)
- DC power flow constraints
3.4.2. Natural Gas Network Constraints
- (1)
- Gas source point
- (2)
- Natural gas pipeline
- (3)
- Compressor
- (4)
- Natural gas flow balance
3.4.3. Heat System Constraints
- (1)
- Heat source model
- (2)
- Heat network model
- (3)
- Heat storage device model
- (4)
- Thermodynamic equilibrium
3.4.4. Carbon Capture Related Constraints
4. Case Study
4.1. Case Setting
4.2. Simulation Results and Analysis
4.3. Influence of Heat Storage Device on Operation Results
4.4. Influence of P2G Capacity and Carbon Sequestration Capacity on Operation Results
5. Discussion
6. Conclusions
- (1)
- Neither CCS nor P2G heat recovery alone can achieve the low-carbon and economic optimization of the system. Combining P2G heat recovery with CCS can effectively improve the system’s wind power consumption and reduce CO2 emissions.
- (2)
- Considering the heat storage device, the operating flexibility of the CHP unit can be improved, and the total operating cost of the system can be reduced.
- (3)
- The larger the capacity of P2G and carbon sequestration capacity is not better. The wind power that P2G can absorb is limited. When its capacity is higher than 500 MW, the total cost of the system will not change. When carbon sequestration capacity is increased by 1900 t, the excess CO2 that is not used to produce methane can be sequestered by means of carbon sequestration. Although increasing carbon sequestration capacity can effectively reduce carbon trading costs, its high carbon sequestration costs cannot be ignored.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Vertex Number | Electric Power/MW | Thermal Power/MW |
---|---|---|
1 | 81 | 104.8 |
2 | 215.0 | 180.0 |
3 | 247.0 | 0 |
4 | 98.8 | 0 |
Scenario | With CCS | With P2G | With Heat Recovery |
---|---|---|---|
1 | × | × | × |
2 | × | √ | × |
3 | × | √ | √ |
4 | √ | × | × |
5 | √ | √ | × |
6 | √ | √ | √ |
Scenario | 1 | 2 | 3 | 4 | 5 | 6 |
---|---|---|---|---|---|---|
Total cost/104$ | 215.66 | 209.12 | 204.32 | 216.85 | 197.29 | 192.87 |
Coal-fired units operating cost/104$ | 90.77 | 90.76 | 90.76 | 93.35 | 93.23 | 93.20 |
Gas purchase cost/104$ | 69.03 | 67.82 | 65.91 | 64.41 | 63.10 | 60.74 |
Carbon purchase cost/104$ | / | 4.04 | 3.86 | / | 0 | 0 |
Wind abandonment cost/104$ | 16.50 | 7.12 | 5.63 | 16.50 | 5.41 | 3.77 |
Transmission and storage cost/104$ | / | / | / | 10.13 | 7.62 | 8.12 |
Carbon trading cost/104$ | 39.38 | 39.38 | 38.17 | 32.47 | 27.93 | 27.04 |
Methane production/m3 | / | 71,462 | 68,317 | / | 83,819 | 80,103 |
Carbon emissions/t | 8503.37 | 8501.16 | 8339.21 | 7615.59 | 6917.02 | 6731.78 |
Scenario | Total Cost /104$ | Wind Abandonment Cost /104$ |
---|---|---|
With thermal energy storage | 192.87 | 3.77 |
Without thermal energy storage | 195.61 | 3.83 |
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Chen, W.; Zhang, J.; Li, F.; Zhang, R.; Qi, S.; Li, G.; Wang, C. Low Carbon Economic Dispatch of Integrated Energy System Considering Power-to-Gas Heat Recovery and Carbon Capture. Energies 2023, 16, 3472. https://doi.org/10.3390/en16083472
Chen W, Zhang J, Li F, Zhang R, Qi S, Li G, Wang C. Low Carbon Economic Dispatch of Integrated Energy System Considering Power-to-Gas Heat Recovery and Carbon Capture. Energies. 2023; 16(8):3472. https://doi.org/10.3390/en16083472
Chicago/Turabian StyleChen, Wenjin, Jun Zhang, Feng Li, Ruoyi Zhang, Sennan Qi, Guoqing Li, and Chong Wang. 2023. "Low Carbon Economic Dispatch of Integrated Energy System Considering Power-to-Gas Heat Recovery and Carbon Capture" Energies 16, no. 8: 3472. https://doi.org/10.3390/en16083472