Title Page
Abstract
Contents
Ⅰ. INTRODUCTION 10
1.1. Introduction 10
Ⅱ. Problem Definition and Formulation 14
2.1. Assumptions 14
2.2. Nomenclatures 15
2.2.1. Parameters 15
2.2.2. Sets and Indices 15
2.2.3. Variables 15
2.3. Problem Definition 16
2.4. Problem Formulation 17
2.4.1. Decision variable 17
2.4.2. Objective function 19
2.4.3. Constraints 23
Ⅲ. Numerical Study 26
3.1. Simulation Environment 26
3.2. Simulation Result 28
3.2.1. IEEE 123 test feeder 28
3.2.2. modified IEEE 123 test feeder 31
Ⅳ. Conclusion 33
APPENDIX 34
References 36
Summary 39
Table 1.1. Previous studies of load phase identification 12
Table 2.1. Reference time period of off-peak/mid/on-peak load of KEPCO 23
Table 2.2. Change in load percentage according to off-peak time period 24
Table 3.1. Number of phase to identify per test feeder 26
Table 3.2. Simulation scenarios 27
Table 3.3. Simulation result of IEEE 123 test feeder 28
Table 3.4. Duplicate solution example of IEEE 123 feeder 29
Table 3.5. Simulation result of modified IEEE 123 test feeder 31
Table 3.6. Duplicate solution example of modified IEEE 123 test feeder 32
Figure 2.1. The direction of data measurement and child node at branch node 14
Figure 2.2. Difference between load and line phase identification 16
Figure 2.3. Physical meaning of modified KCL 19
Figure 2.4. Physical meaning of similarity variation 21
Figure 2.5. Constraint violation example 24
Figure 3.1. Simulation process 26
Figure 3.2. Simulation result of IEEE 123 test feeder diagram 28
Figure 3.3. Relationship between calculated power and load in the absence of similarity variation (IEEE 123 feeder) 29
Figure 3.4. Relationship between calculated power and load including similarity variation (IEEE 123 feeder) 30
Figure 3.5. Simulation result of modified IEEE 123 test feeder diagram 31
Figure 3.6. Relationship between calculated power and load in the absence of similarity variation (modified IEEE 123 feeder) 32
Figure 3.7. Relationship between calculated power and load including similarity variation (modified IEEE 123 feeder) 32
Figure 5.1. Star connected load diagram 34