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The Research Of Islanding Detection In The Distributed Generation Systems

Posted on:2015-04-24Degree:MasterType:Thesis
Country:ChinaCandidate:S H WangFull Text:PDF
GTID:2272330431487519Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the rapid development of the industrial economy of human society and theexploitation and utilization of energy, consequent energy issues are becomingincreasingly concerned community. Environmental issues of energy forcing countriesto invest more money on it. And the development of distributed power technology isbecoming to the most important parts of the development and utilization of newenergy technologies.In a distributed grid systems, wind power and photovoltaic generally asdistributed power generation equipment, and more widely in use. However,distributed power systems and networks around the load and running, but there aresome risks. One of which is a distributed system with grid connection port isdisconnected due to unexpected situations,at the same time, distributed powergeneration system failed to detect this phenomenon and continue to transportelectricity to the local user. This operating mode is called islanding phenomenon. Thiskind of islanding phenomenon would cause some big damages to electrical equipmentand the maintenance personnel. Therefore, international standards are clearly definedand distributed network operating system must have the power islanding detection.In this paper, a distributed grid system as the research object, from the parameteroptimization and simulation modeling has done a thorough analysis and research.Islanding detection method for the classification system and its advantages anddisadvantages are compared and summarized. Analyze the occurrence of islandingconditions such like initial disturbancecf0or positive feedback gain k,and blindassessment strategies in detail. Compare with some highlight strategies, and choosePFAFD to optimize. Summarizes the islanding detection for blind and parameteroptimization strategies commonly used mathematical derivation. Under the premise ofeffectively maintain the accuracy improves the detection rate, reduces the blind spotdetection.UsingQ f0Cnormdetection method to narrow the none detection zone.Determine the disturbance frequency and Load resistance to raise the speed of PFAFDin base on mathematical derivation.Finally summarized parameter optimization strategies commonly usedmathematical derivation. And using the MATLAB/SIMULINK software to simulatethe distributed system, the principle of the proposed islanding detection simulation,verification results. At a same time, Based on MCU STC12C5A60S, an circuit wascreated to simulate the effect of islanding in the PV system. PWM inverter technology is used to simulate the effect of the island, by control the PWM wave frequency andwidth to change the voltage, frequency and phase. Using passive detection method toguarantee the systems is running well. Simultaneously, build the hardware to provethe effectiveness of the passive detection.
Keywords/Search Tags:Distributed generation, Islanding detection, Frequency shift, NoneDetective Zone
PDF Full Text Request
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