The fundamental concern of Maintenance Scheduling (MS) is to reduce the generator failures and extend the generator’s lifespan thereby increasing the system reliability. The objective function of MS problem is to reduce the LOLP and minimizing the annual supply reserve ratio deviation for a power system which are considered as a measure of power system reliability. The typical Particle Swarm Optimization (PSO) is designed for continuous function optimization problems, and not for discrete function optimization problems. The MS problem has discrete decision variables. Hence, the Improved Binary PSO (BPSO) is utilized to solve the MS problem. Furthermore, Improved BPSO (IBPSO) based and levelized reserve rate methods are developed to solve the MS problem. In order to test the effectiveness of the IBPSO based MS method IEEE Reliability Test System (RTS) case study is considered
A comparison is made between the MS results obtained from the levelized reserve and the levelized risk methods. Consequently, the comparison reveals that the levelized risk method is obviously superior to the levelized reserve rate method which is deterministic methods neglect the influence of the generating unit’s random outages.
The IBPSO generates optimal MS solution and overcomes the limitation of the conventional methods such as extensive computational effort which increases significantly as the size of the problem increases. The proposed method yields better result by means of improved search performance and better convergence characteristics which are compared to the other optimization methods and conventional method.
Table of Contents
1 INTRODUCTION
1.1 EQUIPMENT MAINTENANCE
1.1.1 Maintenance scheduling
1.1.1.1 Maintenance activity
1.2 MAINTENANCE SCHEDULING METHODS
1.2.1 Existing methods
1.2.2 Objective function
1.2.2.1 Economic cost objective function
1.2.2.2 Reliability objective function
1.3 LITERATURE REVIEW
1.4 OBJECTIVES
1.5 SUMMARY
2 SOFT COMPUTING TECHNIQUE BASED LEVELIZED RESERVE BASED MAINTENANCE SCHEDULING
2.1 INTRODUCTION
2.2 PROBLEM FORMULATION
2.2.1 Levelized reserve capacity method
2.2.2 Levelized reserve rate method
2.3 MAINTENANCE SCHEDULING CONSTRAINTS
2.3.1 Time constraint
2.3.2 Maintenance crew constraint
2.3.3 Reserve constraint
2.4 PSO BASED APPROACH FOR MAINTENANCE SCHEDULING
2.4.1 Introduction
2.4.2 Overview of PSO
2.4.3 Development of the proposed PSO based MS algorithm
2.5 BPSO BASED MAINTENANCE SCHEDULING
2.6 IMPROVED BPSO BASED MAINTENANCE SCHEDULING
2.6.1 Execution of proposed IBPSO based MS algorithm
2.6.2 Implementation of MS using BPSO and IBPSO
2.7 RESULTS AND DISCUSSION
2.7.1 Case study 2–IEEE RTS
2.7.2 Comparison of results
2.8 SUMMARY
3 LEVELIZED RISK BASED MAINTENANCE SCHEDULING
3.1 INTRODUCTION
3.1.1 Loss of load probability
3.1.2 Loss of load expectation
3.2 LEVELIZED RISK METHOD
3.2.1 Capacity outage probability table
3.2.2 Risk characteristic coefficient
3.3 PROBLEM FORMULATION
3.3.1 Objective function
3.3.2 Encoding scheme for IBPSO based levelized risk method
3.3.4 Implementation of IBPSO based levelized risk method
3.4 RESULTS AND DISCUSSION
3.5 SUMMARY
4 RESEARCH CONCLUSIONS
4.1. RESEARCH SUMMARY AND CONCLUSIONS
4.2 SCOPE FOR FUTURE WORK
Objectives & Topics
The primary objective of this research is to develop and implement advanced optimization techniques, specifically Improved Binary Particle Swarm Optimization (IBPSO), to address the complex Maintenance Scheduling (MS) problem in power systems. The research aims to improve system reliability by balancing reserve margins and minimizing outage risks through coordinated levelized reserve and levelized risk methodologies.
- Application of Binary Particle Swarm Optimization (BPSO) and Improved BPSO (IBPSO) to generator maintenance scheduling.
- Development of stochastic levelized risk-based models considering random forced outages and daily load variations.
- Comparison of performance between traditional deterministic methods and the proposed IBPSO-based heuristic approaches.
- Evaluation of system reliability using indices such as Loss of Load Probability (LOLP) and Loss of Load Expectation (LOLE).
- Benchmarking and validation using the IEEE Reliability Test System (RTS).
Excerpt from the book
1.1 EQUIPMENT MAINTENANCE
A failure in a generating unit results in the unit being removed from service in order to be repaired or replaced. This event is known as an outage. Such outages can compromise the ability of the system to supply the load and affect system reliability. Consequently, the generator MS for a large power system has become a complex, multi-object-constrained optimization problem. Both research and practice show that power system maintenance schedule is in fact a constrained optimization problem. The maintenance schedule that satisfies all the constraints is called a “feasible” schedule.
Preventive MS of the generating unit is an important requirement of power system planning. The MS of generating units attract great attention in power system operation planning. Modern power system is experiencing increased demand for electricity with related expansions in system size, which has resulted in a higher number of generators making MS problem more complicated [1] (1972).. The maintenance of generators is directly associated with the overall reliability of the power system. It is important to supply reliable and economical electricity to the customers. It can be accomplished by optimal schedules of system operation and planning.
The maintenance of power system equipment, especially, the maintenance of generating units, is implicitly related to power system reliability. Therefore, maintenance problem has always been investigated together with system reliability problems and is one of the main subjects in reliability engineering research [7]
Summary of Chapters
INTRODUCTION: Provides an overview of the importance of generator maintenance scheduling for power system reliability and outlines traditional vs. heuristic optimization challenges.
SOFT COMPUTING TECHNIQUE BASED LEVELIZED RESERVE BASED MAINTENANCE SCHEDULING: Discusses the implementation of PSO, BPSO, and IBPSO techniques to solve MS problems focused on levelized reserve capacity and reserve rate.
LEVELIZED RISK BASED MAINTENANCE SCHEDULING: Introduces a stochastic approach that incorporates random forced outages, daily load variations, and the computation of effective load carrying capacity to optimize risk.
RESEARCH CONCLUSIONS: Summarizes the effectiveness of the proposed IBPSO-based methods and suggests future directions for incorporating market and resource-based constraints.
Keywords
Maintenance Scheduling, MS, Loss of Load Probability, LOLP, Loss of Load Expectation, LOLE, Particle Swarm Optimization, PSO, Binary Particle Swarm Optimization, BPSO, Improved BPSO, IBPSO, Power System Reliability, IEEE Reliability Test System, IEEE RTS
Frequently Asked Questions
What is the primary focus of this research?
The research focuses on solving the generator Maintenance Scheduling (MS) problem in power systems by applying heuristic optimization techniques to improve overall system reliability.
What are the main thematic areas?
The study covers power system reliability, maintenance scheduling constraints, soft computing techniques like Particle Swarm Optimization, and the development of levelized reserve and levelized risk models.
What is the main goal of the proposed maintenance scheduling?
The primary goal is to minimize outage risks and annual supply reserve ratio deviations while ensuring that the system can reliably meet electricity demand throughout the year.
Which scientific methods are employed?
The research employs heuristic-based soft computing techniques, specifically focusing on Binary Particle Swarm Optimization (BPSO) and an improved variant (IBPSO), to handle the discrete decision variables of the MS problem.
What topics are discussed in the main body?
The main body details the formulation of objective functions, maintenance constraints, the implementation of IBPSO algorithms, and the evaluation of methods using the IEEE Reliability Test System (RTS).
Which keywords characterize this work?
Key terms include Maintenance Scheduling (MS), Loss of Load Probability (LOLP), Improved BPSO (IBPSO), system reliability, and power system optimization.
Why is IBPSO considered superior to standard BPSO in this study?
IBPSO is used to overcome specific limitations of the standard BPSO in updating particle positions, providing better convergence characteristics and more robust performance for complex, discrete combinatorial problems.
How does the levelized risk method differ from the levelized reserve method?
Unlike the levelized reserve method, which focuses on constant reserve capacity, the levelized risk method considers the generating unit's forced outage rates and daily load variations to maintain a consistent level of reliability throughout the maintenance period.
- Quote paper
- Suresh Kaliyamoorthy (Author), 2015, Generation Maintenance Scheduling Problem in Power System, Munich, GRIN Verlag, https://www.grin.com/document/493401
