Optimal Allocation and Operation of Droop-Controlled Islanded Microgrids: A Review
Abstract
:1. Introduction
2. Microgrid Overview
2.1. Microgrid Classification and Structure
2.1.1. AC Microgrid
2.1.2. DC Microgrid
2.1.3. AC/DC Microgrid
2.2. Microgrid Droop Control Philosophy
2.2.1. Primary Control
2.2.2. Secondary Control
2.2.3. Tertiary Control
2.3. Microgrid Optimization Problems
2.3.1. Allocation Problem
2.3.2. Reconfiguration Problem
2.3.3. Scheduling and Dispatch Problem
2.3.4. Control and EMS Problem
2.3.5. Multi-Criteria Decision Problem
2.3.6. Optimization with Uncertainty Problem
3. Optimization in Microgrids
3.1. Objective Functions
3.1.1. Cost Minimization and Profit Maximization
3.1.2. Emissions Reduction
3.1.3. Voltage Regulation Objectives
3.1.4. Frequency Regulation Objectives
3.1.5. Loadability Maximization
3.1.6. Losses Reduction
3.1.7. Power-Sharing Error Reduction
3.1.8. Stability Improvement
3.1.9. Reliability Maximization
3.2. Constraints
3.2.1. Power Flow and Balance Equality Constraint
3.2.2. DG Power Limits
3.2.3. Cost Limits
3.2.4. Frequency Limits
3.2.5. Voltage Limits
3.2.6. Thermal Limits
3.2.7. ESS Limits
3.2.8. DR Limits
3.2.9. Radiality Limits
3.3. Decision Variables
3.3.1. DG Variables
3.3.2. ESS Variables
3.3.3. DR Variables
3.3.4. Renewable Generation Variables
3.3.5. Droop and PI Controller Parameters
3.3.6. Reconfiguration Variables
3.4. Optimization Algorithms
3.4.1. Classical Optimization Algorithms
3.4.2. AI Optimization Algorithms
- Socially and Physically Inspired Metaheuristics
- Nature-Inspired Metaheuristics
3.4.3. Hybrid Optimization Algorithms
4. Discussion
5. Future Trends
- Generation mix allocation: The importance of having a balanced generation portfolio is fundamental to increase the competitiveness of DCIMG. Hence, determining the optimal DG type, fuel mix, and renewable technology based on economic, environmental, and technical objectives in an aggregated manner is another important direction in future research for the optimal allocation and operation of DCIMG.
- ESS efficiency and environmental impact: Quite often, ESS studies neglect the efficiency and environmental aspect of ESS allocation and operation. It is important to have a thorough investigation to analyze the cost associated with ESS decommissioning and the environmental consequences in storage unit recycling, if any. Similarly, the need is still there for adopting more energy-efficient and fast-charging/discharging ESS technologies at lower costs to make this investment a viable option for isolated and remote DCIMG.
- DR and EV charging coordination issues: DR and EV charging programs are necessary to drive down the generation costs and emissions. However, studies often neglect the behavioral and coordination impact of utilizing these programs for practical voltage and frequency support in DCIMG. Thus, including DR and EV charging programs as uncertain stochastic variables is necessary in future planning and dispatch studies.
- Protection consideration: A comprehensive protection scheme is necessary to ensure safe and reliable disconnection and restoration of supply in the events of faults. Optimization studies must consider protection strategy costs, short circuit calculation, fault levels, and X/R ratio impact on DCIMG operation. This should be of high interest, especially with future DG and ESS allocation studies.
- Uncertainty in microgrids operation: The uncertainty considered in most optimization studies is based on pattern observation or historical recorded data for generation and demand and is often studied in planning studies only. However, in reality, dispatch operations may suffer from unaccounted for uncertainties occurring in a very short period, much smaller than normal load cycles, which could lead the MG to rely on conventional generation or grid-imported power to compensate for any mismatch. This has a negative impact on the carbon footprint of these microgrids and the design philosophy for autonomous operation of DCIMG. Therefore, future scheduling and dispatch studies must include a safety margin in the EMS execution time to account for unseen risks and be equipped with fast analysis techniques to handle short-term uncertainty forecast data.
- Off-peak hours of operation: According to most reviewed articles with intermittent renewable energy utilization, the probability of high generation-to-load mismatch is higher at off-peak hours of operation. Therefore, future studies should focus on useful DL applications to manage excess generation taking cost, emissions, and uncertainty as deciding factors. Additionally, there is a growing need for a comprehensive EMS that is capable of managing power sharing accurately in DCIMG during peak and off-peak hours of operation.
- Applicability of control systems: Many of the control and EMS solutions discussed in this review were applied to small-scale microgrids with few numbers of buses. Furthermore, many of the associated costs for the communication infrastructure and additional equipment were not accounted for. Hence, future research must take into consideration the applicability of these power control solutions on large-scale DCIMG and conduct a cost-based analysis to recommend these systems for practice, especially in low-budget, remote, and isolated microgrids.
- Optimization methods practicality: Despite the significant number of metaheuristics used in DCIMG optimization, many of them lack the accuracy classical methods offer. This is necessary to decrease the computation time without compromising on accuracy to enable real-time application of these AI optimization methods. Furthermore, embedding more adaptable decision-making criteria with these algorithms is vital to avoid guiding the pareto selection process into an area of unbalanced weights for the objectives.
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Appendix A
Acronyms | Definition | Acronyms | Definition |
---|---|---|---|
ABC | Artificial Bee Colony | LP | Linear Programming |
AC | Alternating Current | LV | Low Voltage |
AI | Artificial Intelligence | MAS | Multi Agent System |
ALO | Ant-Lion Optimizer | MCDP | Multi criteria Decision Problem |
BB-BC | Big Bang-Big Crunch | MCS | Monte-Carlo Simulation |
BESS | Battery Energy Storage System | MG | Microgrid |
DC | Direct Current | MGCC | Microgrid Central Controller |
DCIMG | Droop-Controlled Islanded Microgrid | MILP | Mixed Integer Linear Programming |
DG | Distributed Generation | MINLP | Mixed-Integer Non-Linear Programming |
DL | Dump Load | MOO | Multi-Objective Optimization |
DR | Demand Response | MV | Medium Voltage |
DP | Dynamic Programing | NLP | Non-Linear Programming |
EA | Evolutionary Algorithms | NSGA | Non-dominated Sorting Genetic Algorithm |
EDP | Economic Dispatch Problem | OPF | Optimal Power Flow |
EMS | Energy Management System | OUP | Optimization with Uncertainty Problem |
ES | Exhaustive Search | PET | Power Electronic Transformer |
ESS | Energy Storage System | PI | Proportional-Integral |
EV | Electric Vehicle | PSO | Particle Swarm Optimization |
FESS | Flywheel Energy Storage System | PV | Photovoltaic |
FL | Fuzzy Logic | SOC | State of Charge |
FIS | Fuzzy Inference System | SQP | Sequential Quadratic Programming |
GA | Genetic Algorithm | SSIA | Salp-swarm Inspired Algorithm |
GWO | Grey Wolf Optimizer | SVAPO | Searching Vector Artificial Physics Optimization |
HESS | Hydraulic Energy Storage System | TLBO | Teaching Learning Based Optimization |
HS | Harmony Search | TVV | Total Voltage Variations |
IBDG | Inverter-Based Distributed Generation | UCP | Unit Commitment Problem |
ICA | Imperialist Competition Algorithm | VRBESS | Vanadium Redox Battery Energy Storage System |
ITAE | Integral Time Absolute Error | VSI | Voltage Stability Index |
LABESS | Lead-Acid Battery Energy Storage System | WT | Wind Turbine |
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Reference | Optimization Elements | Mode of Operation | Optimization Problem | MG Type | Supervisory Control | Optimal DCIMG | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ob | Co | Var | Alg | MO | Isd | GC | Al | Dis | Re | Cnt | EMS | Pro | AC | DC | Cen | Dec | ||
[1] | Y | Y | N | Y | Y | N | N | Y | N | N | N | Y | N | Y | N | N | N | N |
[2] | Y | Y | Y | Y | Y | N | Y | Y | N | N | N | N | N | Y | N | N | N | N |
[3] | N | N | N | N | N | Y | Y | N | N | N | Y | Y | Y | N | N | Y | Y | N |
[4] | N | N | Y | Y | Y | N | Y | Y | Y | N | N | Y | N | Y | N | N | N | N |
[5] | Y | Y | Y | Y | Y | N | Y | Y | N | N | N | N | N | Y | N | N | N | N |
[6] | N | N | N | Y | Y | N | Y | N | Y | N | N | Y | N | Y | N | N | N | N |
[7] | Y | N | Y | Y | Y | N | Y | Y | Y | N | Y | Y | N | Y | N | Y | Y | N |
[8] | Y | Y | N | Y | Y | N | Y | Y | N | Y | N | N | N | Y | N | N | N | N |
[9] | Y | Y | N | Y | Y | N | Y | Y | N | N | N | N | Y | Y | N | N | N | N |
[10] | Y | N | N | Y | N | N | Y | Y | N | N | N | N | Y | Y | N | N | N | N |
[11] | N | N | N | N | N | Y | Y | N | N | N | Y | N | N | Y | N | Y | Y | N |
[12] | Y | N | N | N | Y | N | Y | N | Y | N | N | Y | Y | N | N | N | N | N |
[13] | N | N | N | Y | N | Y | Y | N | N | N | N | N | N | Y | Y | N | N | N |
[14] | N | N | N | N | N | Y | N | N | Y | N | N | Y | N | Y | N | N | N | N |
[15] | N | N | N | Y | Y | Y | Y | N | N | N | N | Y | N | Y | Y | Y | Y | N |
[16] | Y | N | N | Y | Y | N | Y | Y | Y | N | Y | Y | N | Y | N | N | N | N |
[17] | Y | Y | Y | Y | Y | N | Y | Y | N | N | N | N | N | Y | Y | Y | Y | N |
[18] | Y | Y | Y | Y | Y | N | Y | N | N | N | Y | Y | N | Y | N | N | N | N |
[19] | N | N | N | N | N | Y | Y | N | N | N | Y | N | Y | Y | Y | Y | Y | N |
[20] | N | N | N | Y | Y | N | Y | Y | N | N | N | Y | N | Y | N | N | N | N |
[21] | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | N | Y | N | Y | N | N | N | N |
[22] | Y | N | Y | N | Y | N | N | Y | N | N | N | N | N | N | N | N | N | N |
[23] | N | N | N | Y | Y | Y | Y | Y | N | N | N | N | N | Y | Y | N | N | N |
Microgrid Type | Advantages | Disadvantages |
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AC Microgrids |
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DC Microgrids |
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AC/DC Microgrids |
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Control Methods | Advantages | Disadvantages |
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Centralized Control |
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Decentralized Control |
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Hybrid Control |
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Optimization Methods | Advantages | Disadvantages |
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Classical Methods |
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AI Methods |
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Hybrid Methods |
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Kreishan, M.Z.; Zobaa, A.F. Optimal Allocation and Operation of Droop-Controlled Islanded Microgrids: A Review. Energies 2021, 14, 4653. https://doi.org/10.3390/en14154653
Kreishan MZ, Zobaa AF. Optimal Allocation and Operation of Droop-Controlled Islanded Microgrids: A Review. Energies. 2021; 14(15):4653. https://doi.org/10.3390/en14154653
Chicago/Turabian StyleKreishan, Maen Z., and Ahmed F. Zobaa. 2021. "Optimal Allocation and Operation of Droop-Controlled Islanded Microgrids: A Review" Energies 14, no. 15: 4653. https://doi.org/10.3390/en14154653