電力系統(tǒng)諧波成因分析及諧波潮流計(jì)算外文翻譯-其他專業(yè)-文庫吧資料
2025-01-27 03:22本頁面
【正文】 urce, but electrical power system39。s higher harmonic work, may neglect shoulders the leg. when after has determined in the electric circuit various electrical element39。s overtone equivalent resistance value is: ZN=SQRT (N) R1+JNX1 R1, X1 is the fundamental wave equivalent electric motor39。s overtone impedance the transmission line has the uniform distribution parameter electric circuit, passes through the transmission line which change positionss pletely to be possible to regard as is threephase symmetrical. in tidal current putation, usually by lumped parameter PI equivalent circuit expression. Following chart: in takes into account in the distribution characteristic situation, then: ZLn=Znsh(rnl) Yln/2=(chrnl1)/(Znshrnl) ZN and RN respectively be regarding in this subharmonic when line39。s wiring way and various forewords impedance meter . 3) reactor39。s transformer overtone impedance is: Zn=sqrt(n)RT1+jnXT1(3) And RT1 is the fundamental wave timevariable depressor39。s resistance harmonic order39。s equivalent circuit simplifies for links to meet the original vicemidside node overtone reactance **** *** is the transformer fundamental wave leakage reactance. under higher harmonic39。s initiation leg and the capacitance between turns particularly. When calculates the harmonic current, only considers transformer39。s overtone impedance the electrical power system overtone39。s zero foreword, the positive sequence or the negative sequence reactance, has this subharmonic foreword characteristic to decide , if needs to take into account the work to lose, regarding the generator, may its impedance angle according to 85 degrees estimates, regarding the transmission line, part39。s overtone impedance the qualified generator39。s overtone impedance. (), electrical work each kind of part39。 harmonic current. When in the electrical power system the existence has the overtone source, this time in the system the contact voltage and the branch current will have the higher harmonic. For the determination harmonic voltage and harmonic current39。s n subharmonic electric current row vector. Yn is electrical work39。s current harmonics content, when manufacture namely should limit in certain quantity scope. 4, the generator send out overtone electric potential. The generator will send out the overtone electric potential at the same time also to have the overtone electric potential production, its overtone electricity the potential will be decided by generator39。s siliconcontrolled rectifier controlling element, the siliconcontrolled rectifier control and so on. 3rd, like the fluorescent lamp, the domestic electric appliances and so on single capacity is not big, but quantity and spreads very greatly in each place, electric power department with difficulty management current collector. If these equipment39。s each kind of misalignment current collector for example: Trades the class equipment, the modulator, the electrification railroad, the arc furnace, fluorescence the lamp, the domestic electric appliances as well as each kind of electronic energy conservation control device and so on is the electrical power system overtone important source. Even if these equipment supplies its ideal sine wave voltage, it uses the electric current is also nonlinear, namely has the harmonic current existence. And these the equipment produces the harmonic current will also pour into the electrical power system, will cause system each place voltage to have the harmonic ponent. These equipment39。s security economy movement. Second, electrical power system overtone39。s voltage waveform distortion to be getting more and more serious, has caused the very big harm to the electrical power system, for example: Causes in the power supply system the part
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