小干扰条件下电力系统电压稳定性评估

发布时间：2025-03-18 22:51

　　电压是衡量电能质量的重要指标,电压是否稳定对整个电力系统是否能够安全可靠地运行有重要的影响,系统电压下降不仅会使电网面临电压崩溃,甚至发展为更为严重的大量停电事故。因此,为保证电网安全的运行,尽量避免发生电压失稳事件,有必要对电力系统的电压进行稳定性评估研究。过去电力行业在很大程度上依赖于传统的电力流程来进行电压稳定性的静态分析,通过计算选定负载总线的P-V和Q-V曲线来确定稳定性,这些曲线往往是通过常规模型生成的,但由于功率流存在分歧,不可能完全生成Q-V和P-V曲线,所以本文通过以下三点进行评估:首先,确定大多数发电机或分支由于干扰而消耗更多的无功功率,基于模态的分析及其应用来评估大容量电力系统的电压稳定性。其次,通过电力系统Jacobean矩阵的正负特征值来作为系统电压稳定性的指标,对于小干扰稳态电力系统,正特征值表明系统是稳定的,而负特征值表明系统是不稳定的。最小特征值表示系统与电压不稳定性的接近程度。最后,通过将特征值与每个总线的Q-V灵敏度相关联,更好地理解系统电压稳定性与简化的Jacobean矩阵特征值之间的关系。减少的Jacobean矩阵可以作为对称矩阵,因此如果所有特征...

【文章页数】：72 页

【学位级别】：硕士

【文章目录】：
摘要
Abstract
Chapter 1 Introduction
    1.1 Background and Importance of Research
    1.2 Research status
    1.3 Thesis objectives and methodology
    1.4 The thesis organization
Chapter 2 Mathematical Modelling of P-V and Q-V Curves
    2.1 Power System Stability
    2.2 Power system voltage stability
    2.3 Classifications of voltage stability
    2.4 Various system aspects causes voltage instability
    2.5 Two bus system representation
    2.6 Determination of critical voltage and critical power
    2.7 Analysis and comments in Q-V curves
    2.8 Q-V Curves
Chapter 3 Voltage Stability Modal Analysis
    3.1 Load flow problem
        3.1.1 Bus classifications
        3.1.2 Bus Admittance Matrix
        3.1.3 Bus Loading Equations
        3.1.4 Calculation of Net Injected Power:
        3.1.5 Newton-Raphson Method
        3.1.6 Load Flow based Newton-Raphson Technique
    3.2 V-Q Sensitivity
    3.3 Modal Analysis
    3.4 Participation Factors
        3.4.1 Bus participation factor
        3.4.2 Branch participation factor
        3.4.3 Generator Participation Factor
Chapter 4 Simulation and Results Analysis
    4.1 Introduction
    4.1 Description for network would be studied
    4.2 Load flow voltages results for the buses of power system network
    4.3 Analysis of real case data by using static analysis
        4.3.1 P-V curves for all weak buses
        4.4.2 Q-V curves for all weak buses
    4.4 Analysis of real case data by using modal analysis
        4.4.1 Eigenvalues
        4.4.2 Bus participation factors
        4.4.3 Generators participation factors
        4.5.4 Branch Participation Factors
        4.4.5 V-Q sensitivity for all buses
Chapter 5 Conclusion and Recommendations
    5.1 Conclusion
    5.2 Work Recommendations
References
Appendixes
    Appendix A
    Appendix B
        B.1 Bus data
        B.2 Transmission lines data
        B.3 Generators data
        B.4 Load data
        B.5 Transformer data
Acknowledgements



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