Harmonic Elimination Device Of PT Applied In The Static Frequency Convert System In Huizhou LNG Power Plant

When M701F gas turbine in starting, high speeding cooling, washing or other processes,the driving torque provided by the synchronous generator.Because the generators assynchronous motor operation, By adjusting the power supply frequency is the most effectivemethod to achieve the speed of adjustment.Static frequency converter (SFC) is designed toprovide variable frequency power supply uint.M701F gas-steam combined cycle unit in the starting procedure (generator runs as asynchronous motor)，the generator outlet PT fuse burnt out,or PT burn up,and sometimes theGenerator “start and stop protection” acting result in the unit trip.So,what is the reason ofgenerator outlet PT fuse burnt out,or PT burn up,and sometimes the Generator “start and stopprotection” acting, whether the reason is static frequency converter (SFC) moving,This willbe the main research direction.Starting with variable frequency starting of generator, Static frequency converters in theprocess of starting will produce a lot of harmonics, When the electrical equipment in thesystem constitutes a harmonic resonance circuit,resonance starting. Generators in variablefrequency starting process exceptions in a detailed analysis, the reason is that PT happened inferro resonance.To prevent ferro resonance, after comparing the advantages and disadvantagesof several harmonic schemes, we proposed optimal harmonic measure,and introduced someattention questions in generators starting process.This thesis focusing on the following issues:1) By introducing our generator, outlet PT and static frequency converter(SFC) mainwiring diagram, analysising on the working principle of static frequency converter (SFC),andintroducing generators of variable frequency starting process.2) Describe static frequency converter (SFC) runtime measures that harmonic harm andsuppression of harmonics, analysis of PT theory of Ferro-resonance production, throughanalysis the boot process of waveform when generator PT burned and the generator “start andstop protection” acting events, discussion the root causes of PT burn and generator protectionacting.3) Make several for my plant production of harmonic measure, By comparing theadvantages and disadvantages of harmonic measure, Select one of the most gifted program,design generator outlet PT resonance device.