Risk-Averse Scheduling of Combined Heat and Power-Based Microgrids in Presence of Uncertain Distributed Energy Resources
Abstract
:1. Introduction
1.1. Background and Motivation
1.2. Literature Review
1.3. Contributions
- A risk-averse (RA) robust scheduling model is proposed for the CHP-based microgrids in the presence of uncertain renewable energy sources.
- The severe uncertainties in the power outputs renewable energy sources are handled via the IGDT technique, without the need for any extra information regarding these uncertainties, such as their corresponding PDFs. In most of the aforementioned literature, the impacts of uncertainties are neglected or considered with scenario-based approaches, which need exact information regarding the uncertain parameters, such as their PDFs.
- The impact of flexibilities such as heat and electricity storages as well as DRP on the optimal and robust scheduling CHP-based microgrid is investigated.
1.4. Paper Organization
2. Problem Modeling
2.1. IGDT
2.2. Probabilistic Modeling of Renewable Energy Resources
2.2.1. Modeling of Solar Radiation
2.2.2. Ambient Temperature Modeling
2.2.3. Wind Speed Modeling
2.3. Demand Response Program (DRP) Modeling
2.4. Objective Function (OF)
2.5. Constraints of Generation and Storage Units
2.5.1. CHP Units
2.5.2. Constraints of Conventional Power Generation, Boilers, and Fuel Cell Units
2.5.3. Wind Power Constraints
2.5.4. Solar Power Constraints
2.5.5. Electrical Energy Storage Constraints
2.5.6. Heat Storage Constraints
2.6. Power Balance
2.7. Implementation of IGDT Method
3. Simulations and Results
3.1. Structure of the Studied Microgrid
3.2. Considered Case Studies
- Case 1: CHP-based microgrid scheduling in islanding (off-grid) mode in the absence of DRP.
- Case 2: Microgrid scheduling in the on-grid mode, without considering DRP capability.
- Case 3: Microgrid scheduling in the on-grid mode, considering DRP capability.
- Case 4: Microgrid scheduling in the on-grid mode, considering DRP capability via the RA strategy of the IGDT technique.
3.3. Simulation Results
3.3.1. Case 1
3.3.2. Case 2
3.3.3. Case 3
3.3.4. Case 4
3.3.5. Monte Carlo Simulations (MCS)
4. Conclusions
- For a given level of β, i.e., β = 0.4 the uncertainty radius, i.e., α is obtained to be 0.34. This means that, with the consent of the 40% reduction in the objective function relative to its base-case value, at least 66% of the predicted amount of power generation by renewable energy sources could be available.
- By considering random variations of uncertain parameters based on their corresponding PDFs, via MCS trials, it is observed that the obtained schedule for the microgrid is robust for the determined radius of uncertainty.
- The robust schedule of the microgrid is obtained without any information regarding the nature and behavior of uncertain parameters, e.g., their PDF.
- Additionally, despite the other methods for uncertainty handling, such as MCS and scenario-based stochastic modeling, the IGDT does not add any computational complexity to the scheduling problem of microgrids.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Nomenclature
Alphabetic symbols | |
a, b, c, d, e, f | CHP unit cost function coefficients |
A | Area of solar farm ) |
B | Heat stored in the storage unit |
C | Cost of the unit’s operation |
c | Scale parameter of Weibull PDF |
DL | Percentage of decreasing demand |
E | Battery stored power |
H | Heat generated (MW) |
IL | Percentage of increasing demand |
k | Form parameter of Weibull PDF |
P | Power generation and demand |
s | Solar radiation |
SU | Startup status of the units |
SD | Shut down status of the units |
T | Ambient Temperature (°C) |
V | Binary variable indicator of ON and OFF status of the units |
Greek symbols | |
Maximum possible deviation of the uncertain parameter | |
Degree of tolerance of the reduction of the OF | |
Parameters of the beta function | |
Uncertain input parameter | |
Cost function coefficient of a fuel cell | |
Price of electricity market | |
Mean | |
Cost function coefficient of a boiler | |
Standard deviation | |
Wind speed | |
Set of decision-making variables | |
Set of uncertainties | |
Gamma function | |
Critical value of objective function | |
Uncertainty radius of the uncertain parameter | |
Cost function coefficient of a conventional power generation unit | |
Subscripts | |
cha | Battery charging |
discha | Battery discharging |
gain | Heat return |
loss | Energy losses |
h | Total number of power generation units |
i | Number of CHP units |
j | Number of conventional power generation units |
k | Number of boiler units |
l | Number of fuel cell units |
m | Number of wind turbines |
t | Time (Hour) |
Superscript | |
CHP | CHP unit |
CI, CO, R | Minimum, maximum, rated wind speed |
inc | Transferred demand from the other hours to t |
dec | Transferred demand from t to the other hours |
WT | Wind turbine |
0 | Microgrid demand before applying the DRP |
B | Fuel cell unit |
F | Boiler unit |
P | Conventional power generation unit |
T | Temperature |
s | Solar radiation |
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Specification | Value | Specification | Value |
---|---|---|---|
Pcha.max (MW) | 3 | Emax (MW) | 6 |
Pcha,min (MW) | 0 | Emin (MW) | 0 |
Pdisch,max (MW) | 3 | ηcha | 0.9 |
Pdisch,min (MW) | 0 | ηdisch | 0.9 |
bgain | bloss | η | (MW th) | (MW th) | Bmax (MW th) | Bmin (MW th) |
---|---|---|---|---|---|---|
0.3 | 0.6 | 0.01 | 2 | 2 | 7 | 0 |
Unit/Specification | Startup Cost (USD) | Shut Down (USD) |
---|---|---|
CHP1 | 20 | 20 |
CHP2 | 20 | 20 |
Power-Only | 12 | 12 |
Heat-Only | 9 | 9 |
Fuel Cell | 0.0207 | 0.0207 |
Hours (h) | µv | σv | Hours (h) | µv | σv |
---|---|---|---|---|---|
1 | 10.7 | 3.0363 | 13 | 6.2667 | 0.6807 |
2 | 10.5667 | 2.7647 | 14 | 6.3333 | 0.7506 |
3 | 10.3667 | 2.9501 | 15 | 5.6000 | 0.3606 |
4 | 9.9333 | 3.1005 | 16 | 5.8333 | 0.6506 |
5 | 9.6000 | 3.0512 | 17 | 5.3667 | 1.2014 |
6 | 9.6667 | 3.0892 | 18 | 4.0667 | 1.7559 |
7 | 9.6333 | 3.2347 | 19 | 2.8667 | 1.3013 |
8 | 10.0333 | 2.9143 | 20 | 2.7333 | 1.0017 |
9 | 10.1667 | 2.4826 | 21 | 2.8000 | 0.8888 |
10 | 10.5333 | 2.3459 | 22 | 2.8000 | 0.7937 |
11 | 11.0000 | 2.5515 | 23 | 2.8333 | 0.6351 |
12 | 11.2333 | 2.5891 | 24 | 2.9000 | 0.6083 |
Hours (h) | µs | σs | Hours (h) | µs | σs |
---|---|---|---|---|---|
1 | 0 | 0 | 13 | 0.6780 | 0.1283 |
2 | 0 | 0 | 14 | 0.5699 | 0.1011 |
3 | 0 | 0 | 15 | 0.4124 | 0.0765 |
4 | 0 | 0 | 16 | 0.2394 | 0.0446 |
5 | 0 | 0 | 17 | 0.0834 | 0.0230 |
6 | 0.0158 | 0.0196 | 18 | 0 | 0 |
7 | 0.1605 | 0.0334 | 19 | 0 | 0 |
8 | 0.3412 | 0.0658 | 20 | 0 | 0 |
9 | 0.506 | 0.1002 | 21 | 0 | 0 |
10 | 0.6385 | 0.1319 | 22 | 0 | 0 |
11 | 0.7120 | 0.1551 | 23 | 0 | 0 |
12 | 0.7305 | 0.1510 | 24 | 0 | 0 |
Case # | Objective Function (USD) | Generation Cost (USD) | Sale Revenue (USD) | Purchase Cost (USD) | α | β |
---|---|---|---|---|---|---|
1 | −2013.5 | 2013.50 | - | - | - | |
2 | 2371.01 | 3405.97 | 5928.10 | 150.84 | - | - |
3 | 2556.49 | 3405.97 | 6153.02 | 190.56 | - | - |
4 | 1533.90 | 3405.97 | 5195.38 | 255.52 | 0.34 | 0.40 |
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Rabiee, A.; Abdali, A.; Mohseni-Bonab, S.M.; Hazrati, M. Risk-Averse Scheduling of Combined Heat and Power-Based Microgrids in Presence of Uncertain Distributed Energy Resources. Sustainability 2021, 13, 7119. https://doi.org/10.3390/su13137119
Rabiee A, Abdali A, Mohseni-Bonab SM, Hazrati M. Risk-Averse Scheduling of Combined Heat and Power-Based Microgrids in Presence of Uncertain Distributed Energy Resources. Sustainability. 2021; 13(13):7119. https://doi.org/10.3390/su13137119
Chicago/Turabian StyleRabiee, Abbas, Ali Abdali, Seyed Masoud Mohseni-Bonab, and Mohsen Hazrati. 2021. "Risk-Averse Scheduling of Combined Heat and Power-Based Microgrids in Presence of Uncertain Distributed Energy Resources" Sustainability 13, no. 13: 7119. https://doi.org/10.3390/su13137119