A CVaR-Robust Risk Aversion Scheduling Model for Virtual Power Plants Connected with Wind-Photovoltaic-Hydropower-Energy Storage Systems, Conventional Gas Turbines and Incentive-Based Demand Responses
Abstract
:1. Introduction
- A VPP coupled with WPP, PV, SHS, ESS, CGT, and an incentive-based demand response (IBDR) with the implementation of PBDR on the user side. Among these, the SHS equipped with regulating reservoirs can distribute the output according to the real-time load demand, which can provide reserve services for the WPP and PV coupling operation with CGT and ESS. WPP and PV have high environmental and economic benefits, as well as high risks, so balancing the benefits and risks is the key to the optimal operation of the VPP.
- A basic scheduling model for the VPP operation is put forward without considering uncertainty. The maximum revenue of the VPP operation is taken as the objective function of the optimization model, considering energy balance constraints, different power sources, and system rotating reserve constraints. The basic scheduling results could provide an important decision-making reference for determining the VPP operation risks and verifying the effectiveness of the risk aversion model.
- A CVaR-robust-based aversion scheduling model for the VPP operation is constructed with the objective function of minimum operation losses. First, the uncertainty analysis for WPP, PV, SHS, and the load are made, and WPP and PV selected as the main uncertainty factors. Second, the conditional value at risk (CVaR) method and robust optimization theory are used to reflect the operation risks brought about by uncertainty in the objective function and restrictions, respectively. Finally, a solution methodology is constructed after converting the mixed integer nonlinear programming (MINLP) model into a mixed integer linear programming (MIP) model with three cases for comparative analysis.
2. VPP Description
2.1. VPP Participants
2.2. VPP Output Model
3. Basic Scheduling Model for VPP
3.1. Objective Function
3.2. Constraint Conditions
4. Risk Aversion Model for VPP
4.1. Uncertainty Analysis
4.2. Mathematical Model
4.2.1. CVaR Theory
4.2.2. CVaR-Robust Model
4.3. Solution Methodology
5. Case Analysis
5.1. Basic Data
5.2. Result Analysis
5.2.1. Scheduling Result of VPP in Case 1
5.2.2. Scheduling Result of VPP in Case 2
5.2.3. Scheduling Result of VPP in Case 3
5.3. Comparative Analysis
5.3.1. The Impact of ESS on VPP Operation
5.3.2. The Impact of PBDR on VPP Operation
5.3.3. The Impact of Linearization on VPP Operation
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Time&price | PBDR | IBDR | |||||
---|---|---|---|---|---|---|---|
Peak Period | Valley Period | Flat Period | Energy Market | Reserve Market | |||
Up | Down | ||||||
Time divide | Summer | 10:00−18:00 | 0:00−7:00 | 8:00−9:00&19:00−24:00 | |||
Winter | 12:00−20:00 | 0:00−7:00 | 8:00−11:00&21:00−24:00 | ||||
Power price (¥/kW·h) | 0.69 | 0.33 | 0.55 | 0.5 | 0.2 | 0.6 |
Typical Day | Power Output/MW·h | Abandoned Energy/MW·h | Revenue/¥ | |||||||
---|---|---|---|---|---|---|---|---|---|---|
CGT | PV | WPP | SHS | ESS | IBDR | WPP | PV | SHS | ||
Summer | 7.562 | 2.09 | 5.517 | 4.652 | (0.25, −0.24) | (0.36, −0.39) | 0.48 | 0.11 | 0.245 | 7804.85 |
Winter | 7.282 | 1.673 | 8.566 | 2.058 | (0.20, −0.20) | (0.21, −0.18) | 0.745 | 0.146 | 0.179 | 8265.32 |
β | Summer | Winter | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Power Output/MW·h | CVaR/¥ | Power Output/MW·h | CVaR/¥ | |||||||||||
CGT | PV | WPP | SHS | ESS | IBDR | CGT | PV | WPP | SHS | ESS | IBDR | |||
0.8 | 8.06 | 1.95 | 5.43 | 4.50 | (0.3, −0.3) | (0.36, −0.30) | 1764.58 | 7.61 | 1.61 | 8.43 | 2.01 | (0.35, −0.33) | (0.33, −0.27) | 1878.18 |
0.85 | 8.18 | 1.92 | 5.32 | 4.47 | (0.35, −0.36) | (0.36, −0.24) | 1740.27 | 7.80 | 1.59 | 8.26 | 2.00 | (0.4, −0.36) | (0.30, −0.24) | 1852.30 |
0.90 | 8.49 | 1.87 | 5.10 | 4.41 | (0.4, −0.4) | (0.33, −0.18) | 1725.59 | 8.19 | 1.55 | 7.91 | 1.97 | (0.45, −0.44) | (0.27, −0.18) | 1836.67 |
0.95 | 8.53 | 1.83 | 5.02 | 4.39 | (0.5, −0.4) | (0.33, −0.15) | 1713.89 | 8.31 | 1.51 | 7.79 | 1.96 | (0.50, −0.48) | (0.27, −0.15) | 1824.22 |
0.98 | 8.83 | 1.75 | 4.85 | 4.36 | (0.5, −0.44) | (0.30, −0.15) | 1703.36 | 8.67 | 1.45 | 7.53 | 1.95 | (0.5, −0.48) | (0.24, −0.15) | 1813.01 |
Typical Day | Power Output/MW·h | Operation Results/¥ | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
CGT | PV | WPP | SHS | ESS | IBDR | Revenue | VaR | CVaR | ||
Summer | Case 1 | 7.562 | 2.09 | 5.517 | 4.652 | (0.25, −0.24) | (0.36, −0.39) | 7804.85 | ||
Case 2 | 8.49 | 1.870 | 5.104 | 4.41 | (0.40, −0.40) | (0.33, −0.18) | 7645.50 | 1716.77 | 1725.59 | |
Case 3 | 8.921 | 1.760 | 4.797 | 4.407 | (0.30, −0.28) | (0.09, −0.15) | 7440.70 | 1785.48 | 1824.35 | |
Winter | Case 1 | 7.282 | 1.673 | 8.566 | 2.058 | (0.20, −0.20) | (0.21, −0.18) | 8265.32 | − | − |
Case 2 | 8.190 | 1.550 | 7.912 | 1.97 | (0.45, −0.44) | (0.27, −0.18) | 8137.68 | 1827.29 | 1836.67 | |
Case 3 | 9.342 | 1.455 | 6.984 | 1.901 | (0.30, −0.24) | (0.09, −0.09) | 7793.98 | 1842.36 | 1875.48 |
Capacity/ MW·h | Power Output/MW·h | Operation Results/¥ | |||||||
---|---|---|---|---|---|---|---|---|---|
CGT | PV | WPP | SHS | ESS | IBDR | Revenue | VaR | CVaR | |
0 | 9.941 | 1.419 | 6.517 | 1.834 | 0 | (0.15, −0.15) | 7645.54 | 1905.430 | 1938.840 |
0.2 | 9.342 | 1.455 | 6.984 | 1.901 | (0.3, −0.24) | (0.09, −0.09) | 7793.98 | 1842.362 | 1875.48 |
0.4 | 8.983 | 1.497 | 7.176 | 1.935 | (0.36, −0.3) | (0.12, −0.12) | 7867.843 | 1833.789 | 1869.525 |
0.6 | 8.682 | 1.539 | 7.316 | 1.965 | (0.45, −0.39) | (0.12, −0.15) | 7937.503 | 1822.579 | 1860.852 |
0.8 | 8.351 | 1.581 | 7.504 | 1.975 | (0.51, −0.45) | (0.15, −0.18) | 8028.115 | 1810.506 | 1851.539 |
1.0 | 8.199 | 1.602 | 7.599 | 1.982 | (0.54, −0.48) | (0.15, −0.18) | 8065.874 | 1795.140 | 1836.481 |
Peak-to-Valley Price Gap | Load Demand/MW | Peak-to-Valley Ratio | Clean Energy Output/MW·h | Revenue/ ¥ | VaR /¥ | CVaR /¥ | |||
---|---|---|---|---|---|---|---|---|---|
Max | Min | PV | WPP | SHS | |||||
1 | 0.900 | 0.709 | 1.270 | 1.76 | 4.797 | 4.407 | 7440.7 | 1785.48 | 1824. 35 |
2 | 0.891 | 0.723 | 1.233 | 1.848 | 5.037 | 4.440 | 7584.963 | 1805.447 | 1844.457 |
2.6 | 0.882 | 0.730 | 1.209 | 2.024 | 5.517 | 4.505 | 7873.49 | 1845.38 | 1884.67 |
3 | 0.878 | 0.733 | 1.197 | 2.141 | 5.837 | 4.549 | 8065.841 | 1872.002 | 1911.479 |
3.5 | 0.876 | 0.735 | 1.192 | 2.200 | 5.997 | 4.570 | 8162.017 | 1885.313 | 1924.883 |
cases | MIP | MINLP | Time/s | |||||
---|---|---|---|---|---|---|---|---|
Revenue/¥ | VaR/¥ | CVaR/¥ | Revenue/¥ | VaR/¥ | CVaR/¥ | MINLP | MIP | |
Case 1 | 7804.85 | 7895.96 | 245 s | 10 s | ||||
Case 2 | 7645.50 | 1716.77 | 1725.59 | 7442.65 | 1785.27 | 1893.48 | 278 s | 14 s |
Case 3 | 7440.70 | 1785.48 | 1824.35 | 7305.45 | 1805.45 | 1905.12 | 304 s | 18 s |
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Ju, L.; Li, P.; Tan, Q.; Tan, Z.; De, G. A CVaR-Robust Risk Aversion Scheduling Model for Virtual Power Plants Connected with Wind-Photovoltaic-Hydropower-Energy Storage Systems, Conventional Gas Turbines and Incentive-Based Demand Responses. Energies 2018, 11, 2903. https://doi.org/10.3390/en11112903
Ju L, Li P, Tan Q, Tan Z, De G. A CVaR-Robust Risk Aversion Scheduling Model for Virtual Power Plants Connected with Wind-Photovoltaic-Hydropower-Energy Storage Systems, Conventional Gas Turbines and Incentive-Based Demand Responses. Energies. 2018; 11(11):2903. https://doi.org/10.3390/en11112903
Chicago/Turabian StyleJu, Liwei, Peng Li, Qinliang Tan, Zhongfu Tan, and GejiriFu De. 2018. "A CVaR-Robust Risk Aversion Scheduling Model for Virtual Power Plants Connected with Wind-Photovoltaic-Hydropower-Energy Storage Systems, Conventional Gas Turbines and Incentive-Based Demand Responses" Energies 11, no. 11: 2903. https://doi.org/10.3390/en11112903