| With the fast development of power electronic technologies, more and more new FACTS devices should be used in power grid. As the operational status of the new FACTS devices and control strategies more complex, so the transient process of power grid failures are becoming increasingly complex and higher demand was made on the reliability, security, speed, selectivity and sensitivity of protection. In a system with FACTS devices, because the control parameters of FACTS devices changes with the system in different operating conditions, the amplitude and frequency of harmonic and transient components in fault condition will be in accordance with the different components and fault location changes. The above factors give a challenge on the performance and working principle of the traditional relay protection. Therefore, study of FACTS devices on the relay, as well as the impact of FACTS devices containing the new principle of relay protection, which have great theoretical and practical value on ensuring security and stability of power grid operation.This paper focused on the impact of FACTS devices and their protection of the relay new principle. Full-text was divided into eight chapters. The first chapter expounded the purpose and significance of the research work. Give a comprehensive summary the current domestic and foreign-related research. Present the content of this paper.The second chapter discussed in detail the working principle of the new FACTS devices and mathematical models. Using PSCAD / EMTDC simulation software to establish high-power FACTS devices containing high-voltage transmission line transient analysis model. Establish a systematic integration of the various relay modules. Analyzing the system transient process of FACTS devices in different operating modes, different control strategies and different fault type of fault cases. Laid the foundation for a detailed analysis of the impact of relay protection and the new proposed principles.Chapter III analyzed the effects on line protection of the new series FACTS devices static synchronous series compensator SSSC and the Static Synchronous Compensator(STATCOM). The reasons for the wrong action was summarized in line distance protection generated beyond the scope and malfunction due to errors. Chapter IV analyzed the frequency characteristics of the series compensated transmission line fault current according to the frequency domain model of series compensated transmission lines. Analyzed the transient high-frequency signal frequency components complexity of series compensated lines internal and outside fault. Using the changes in the signal characteristics of complexity, presented a new single-ended transient protection method adapted to series compensation line. Simulation analysis showed that the program has a good adaptability and agility. Chapter V improved the shortcomings for the Hilbert - Huang (HHT) algorithm. Applied improved HHT method, analyzed the spectral characteristics of high-frequency current components measured at protection installed in the condition of internal line fault and outside line fault. Proposed a new line transient protection principles based on improved HHT. Simulation results proved the feasibility of this principle. Chapter VI researched the coordination control problem between FACTS components, devices of relay protection and automatic recloser devices, according to different operating modes, different control strategies and different fault types such circumstances the system fault transient process of FACTS devices. Using multi-Agent system, presented the new coordination method between FACTS devices, the relay and the recloser. Developed the overall program based on Multi-Agent technology. Optimize the multiple FACTS components controller parameters with fuzzy set theory and multi-objective evolutionary algorithm. A new coordinated control method was proposed based on fuzzy hybrid evolutionary algorithm and simulation test proved this method. Chapter VII was the full text summary.
|
PDF Full Text Request