[Graduation project] 1-1Matlab small current grounding system modeling and single-phase fault simulation analysis (simulation project file + result map + answer essay + answer PPT)
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mission statement
Research content: Based on the MATLAB/Simulink simulation software, the simulation model of the small current grounding system is built, and the single-phase grounding fault simulation analysis is carried out.
Research methods:
1. Preparatory stage: understand the research dynamics and determine the research content;
2. Information review stage: collect research materials and determine the research plan;
3. Design stage: conduct modeling and simulation according to the design requirements, record and organize data;
4 . Data analysis and integration stage: conduct quantitative analysis on the obtained data and write papers;
5. Summary and reflection: reflect on and correct the deficiencies and mistakes in the research.
Requirements:
1. Check the information to understand the voltage and current changes after a single-phase ground fault in the small current grounding system;
2. Build the models of the neutral point ungrounded system and the arc suppression coil grounded system;
3. Correctly correct the built model Safety verification: After simulating the B-phase ground fault, the waveform analysis of the line zero-sequence voltage and the line zero-sequence current waveform analysis.
Links
1. Simulation engineering documents
2. Simulation results figure
3. Supporting paper (low repetition rate) 24878 words
4. Supporting defense PPT
5. English literature
design manual
Summary
With the development of urban and rural areas, the power system has been continuously improved, the structure of the power distribution network has also become complex, and the laying of cables has also been greatly improved. The capacity of the distribution network system is increased, the current is increased, and lightning protection measures are usually not built in the construction of the power system, but in some places lower than the ground, the distribution system cannot withstand too high voltage, and the network The intricate changes of the system and the surrounding environment will lead to faults in the distribution network system. Generally speaking, one-way ground faults account for more than 80% of the faults in the entire distribution network. After a one-way ground fault occurs in the power distribution system, it will not cause power interruption. However, if the fault occurs for a long time, the insulation layer will be broken down during operation, resulting in two ground faults. It may even cause the voltage of the entire system to be too high, resulting in damage to the power supply equipment and affecting the normal operation of the power system. Therefore, it is necessary to eliminate the fault points of the system in time.
In the research of this system, the small current grounding of the power transmission system is mainly studied. Small current grounding is an ineffective grounding method, which can ensure the stability of the power system in use. There are two methods for small current grounding, the first is that the neutral point is not grounded, and the second is that the neutral point is grounded through the arc suppression coil. The use of the two methods needs to be selected according to the requirements of the system. In this paper, two kinds of small current grounding methods are studied in depth. Use the current popular simulation software MATLAB to build a system model, and calculate the operating parameter settings of the equipment, coils, and wiring methods used in the system. The operating parameters of the system are output through the simulation software, and the simulation results are displayed. The use significance of the two grounding methods is obtained. Finally, summarize the content and harvest of this research.
Design framework
Chapter 1 Introduction 2
Section 1 Research background and research significance 2
Section 2 Development of grounding methods 2 1.
Development of foreign grounding methods 2
2. Development of domestic urban and rural distribution network grounding methods 3
Section 3 Main research content of this paper 4
Section 4 Summary of this Chapter 4 Chapter
2 Process Analysis 6 Section
1 Power System Wiring Mode 6
1. Classification of Wiring Mode 6
2. Characteristics of Small Current Grounding Mode 6
3. Small Current Grounding Mode and Wiring Mode 7
4. Distribution Network Grounding Development trend of methods 7 Section 2 Introduction of two grounding methods
for small current grounding systems 10 4. Grounding mode of neutral point via arc suppression coil 10 5. Operation analysis of grounding mode of neutral point via arc suppression coil 11 6. Characteristics of grounding mode of neutral point via arc suppression coil 13 Section 3 Summary of this chapter 14 Chapter 3 Modeling small current grounding system based on MATLAB 15 Section 1 Introduction to MATLAB and system construction 15 1. Introduction to MATLAB 15 2. Introduction to power system simulation tools 16 Section 2 Building a simulation model for small current grounding system 20 1. Steps to build a simulation model 20 2 , Simulation and calculation of neutral point ungrounded system 21
3. Simulation and calculation of the neutral point through the arc suppression coil grounding system 25
Section 3 simulation results and analysis 26
1. Simulation results and analysis of the neutral point ungrounded system 26
2. Simulation of the neutral point through the arc suppression coil grounding Results and Analysis 30
Section 4 Summary of this Chapter 33
Conclusion 34
Acknowledgments 36
References 37
Appendix 39
1. Original English text 39
2. English translation 46
Design instructions and design documents
Reference manual: 24878 words
simulation settings
