電力系統(tǒng)諧波成因分析及諧波潮流計算外文翻譯-其他專業(yè)-展示頁
2025-01-31 03:22本頁面
【正文】 to lose increases, reduces current collector39。s unceasing development, the high efficiency traded the class equipment and the modulator use, high in the electrical power system presses the nonlinear element which the direct current transmission the application, the massive misalignment load39。Analysis of power system overtone and overtone tidal current to calculate First, introduction an ideal electrical power system is by the sole constant frequency and the stipulation peaktopeak value regulated voltage power supply. But in fact, as a result of the recent years along with science39。s and technology39。s appearance as well as the power supply system itself existed and so on to cause in the system39。s service life, to disturb the munication system and so on. Serious when even can also cause equipment the damage, automatic control malfunction, relay protection misoperation, thus creates the power cut accident and so on and other questions. Socalled the friend knows other, is undefeated in many battles , therefore, must realize to the electrical work overtone prehensive program of public order, must make clear the overtone origin and the electrical work in under the each different movement way the overtone tidal current distributed situation, adopts the corresponding measure limit and the harmonic cancellation, thus changes the friendly power supply system power supply quality and guarantees system39。s origin in the electrical power system the overtone source is many and varied. Mainly has the following several kinds: in 1, system39。s harmony the wave content decided that in its characteristic and the working condition, basically has nothing to do with the electrical power system parameter, may regard as overtone constant flow the source. 2, the power supply system itself exists the nonlinear element is overtone another origin. These nonlinear element mainly has the transformer to stir up the capacitor which, the reactor group the magism leg, the alternating and direct convertor station39。s current harmonics content is oversized, will then have the serious influence to the electrical power system, to this kind of equipment39。s structure and the working condition, basically will have nothing to do with the external connection impedance. Therefore may regard as overtone constant pressure source , but its value is very small. the three, electrical power system overtone tidal current calculates the socalled electrical power system overtone tidal current putation, is through solution work equation In=YnUn (n=3,5,7 ...... n: Agrees wave number the number. In is the overtone source load pours into electrical work39。s n subharmonic conductance. Un is in the electrical work a various nodes bus bar n subharmonic voltage row vector). Obtains in the electrical work various nodes (bus bar) the harmonic voltage, enters to obtain in various legs39。s in power supply system distribution, needed to carry on to the overtone impedance constitution equivalent circuit the tidal current putation, when simultaneously in the rectifier unit power supply system possessed forbearance the part existed, but must act according to various legs overtone impedance the nature and the size, whether there is examined the resonant situation. carries on the overtone tidal current putation, must first determine the electrical work part39。s overtone impedance: (1), synchronous generator39。s electric potential is the pure sine, does not include the higher harmonic, its generator electric potential only exists in the fundamental wave work. in higher harmonic work, because the generator overtone electric potential is very small, this time the visible generator overtone electric potential is zero. Therefore its and so on the value electric circuit is the junctor end and neutral point o
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