Dissertation > Excellent graduate degree dissertation topics show

Study on Harmonic Source Identification Based on Parameter Identification Method in Power Distributed System

Author: CaiMing
Tutor: TangKunMing
School: Chongqing University
Course: Electrical Engineering
Keywords: Power system harmonic sources SVD algorithm Sine approximation algorithm Loads Non-linearity Factor Three-phase unbalanced system
CLC: TM711
Type: Master's thesis
Year: 2011
Downloads: 130
Quote: 1
Read: Download Dissertation

Abstract


Harmonic becomes an important element of impact for electric quality in power system, harmonic sources identifying and location are necessary for actual detection and management. To detemine whether harmonic soutrces exist in the load is of essitial importance for improving and managing the affect of the harmonics on power system. The major work and conclusion as follows:The paper firstly introduces the existing harmonic sources identification methods in distributed system, and analyzed and summarized these methods advantages and disadvatages. Then, the haomonic source identification based on Parameter Identification method is proposed.The paper in-depth research and analysis the harmonic sources identification based on Parameter Identification method. Based on the non-linear load impedance generating harmonic, the paper establishes the harmonic equivalent load model in time domain. Under the situation of unknown the loads parameters, using SVD algorithm parameter identification method to identify the load impedance according to the physical relationship of voltage and current at the point of common coupling (PCC), then identified the harmonic source. Furthermore, in order to solve the impedance parameters in real time, this paper proposes a load equivalent impedance point by point identification method, that is the sine approximation method.Using the PSCAD / EMTDC software established simulation model which has a good application in harmonic research, to apply the simulation model by MATLAB. SVD algorithm and sine approximation method are simulated by the model programmed with MATLAB, the simulation results demonstrate the effectiveness and feasibility of the proposed method.Combined with the actual situations of three-phase unbalanced system and lager impedance fluctuations in power network, the application of SVD algorithm for evaluating the harmonic impedance is extended from single phase power system to three-phase unbalanced power system. Start from solving the virtual neutral point voltage, the paper analysis the virtual neutral point voltage of the star circuit and triangle circuit. Based on this method, each circuit of the independent phase is analysised. Simulation results show that the idea is reasonable and feasible for the problem of three-phase unbalanced system. Finally, using Loads Non-linearity Factor to evaluate the distortion level of the various nonlinear loads which can judge and divide the responsibility of each harmonic source, simulation results show that the Loads Non-linearity Factor is universal to the loads which under the same voltage level, and can provide some theory for practical use of governing harmonic efficiently.

Related Dissertations

  1. Desigh and Research of Wireless Sensor Network Position System Based on ZigBee Technology,TP212.9
  2. Study on Dynamic Harmonic State Estimation Technology Based on Kalman Filter,TM711
  3. Research on Countermeasures Against Multi-Path Fading in WIMAX,TN925
  4. Research on Detection and Localization of Harmonic Sources in Power System,TM711
  5. Fault Localization Method for Distribution Network Based on Fault Indicators,TM711
  6. Research on the Analysis of Power System Harmonics,TM711
  7. The Related Technologies Research of Harmonic Treatment in Power System,TM711
  8. Research on Measurement Analysis and Treatment of Harmonics in Yuhuan Distribution Network,TM711
  9. The Research of Harmonic Filtration of Large Data Center,TM711
  10. Harmonic Current Suppression Method Based on Characteristic of Inductance Storing Energy,TM711
  11. Study of Systemic Harmonic Monitoring and Management on Distribution Power System,TM711
  12. Research on Harmonic and Interharmonic Detection Method with Neural Network,TM711
  13. The Application Research of Space Voltage Vector Control Method on Active Power Filter,TM711
  14. Power harmonic detection and elimination,TM711
  15. Study of Elimination and Analysis Device on Power Harmonic,TM711
  16. Study of Power Flow Analysis and Transient Simulation for Tianjin Utility,TM711
  17. Analysis and Control of the Harmonics Caused by Electrified Railway in Inner Mongolia Hohhot-Baotou,TM711
  18. Based on the Hybrid Active Power Filter to Suppress Harmonic and Compensate Reactive in Electrified Railway,TM711
  19. Research on Power Network Parameter Estimation Method and Its Application,TM711
  20. Research on Harmonic State Estimation Based on Wide Area Measurement System,TM711
  21. Transmission Capacity Analysis and Risk Assessment of Hebei Southern Network,TM711
  22. Study of the Power Quality Problem Caused by Large-scale Integrated Wind Farm,TM711

CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Theory and Analysis > Network analysis,power system analysis
© 2012 www.DissertationTopic.Net  Mobile