negative sequence power 中文意思是什麼
negative sequence power
解釋
負序功率-
This paper focuses on the control strategies to improve the performance of the three - phase ac - dc pwm voltage - source - converters ( vsr ) under unbalanced power supply. the problems such as negative sequences current, voltage and current harmonics and un - constant ( un - smooth ) power flow from ac to dc side are discussed in this paper. the analytical solutions for negative sequence current and harmonic current elimination are obtained by fully feed - forward of negative sequence voltage and producing a non - harmonic current command of the inner - loop
電網不平衡時，基於電網平衡為約束條件設計的三相vsr將出現不正常運行狀態，比如三相vsr交流電流中出現負序分量，使交流電流嚴重不對稱；直流電壓和交流電流中出現非特徵諧波分量，使直流電壓和交流電流波形發生嚴重畸變；三相vsr從電網吸收不平衡的瞬時功率等一系列問題。 -
This paper describes mainly system functions, measuring methods, circuit design, software program and errors analysis of a new type of measuring instrument. this instrument can measure and monitor electric parameters in single - phase circuits, three - phase ( three - wire or four - wire ) circuits. this system can be applied to electric devices and power plants, transformer substations with harmonic pollution. it can measure current, voltage, power, energy, frequence, power factor etc. it also can detect load quality, phase sequence, alarm, display and print results, as well as detect and dispose negative power
該儀器適用於含有諧波污染情況下的機電設備現場、發電廠、供電局、企業變電所現場，可用來測量電流、電壓、有功功率、無功功率、視在功率、有功電能、無功電能、視在電能以及頻率和功率因數等電參數，並具有負載性質（感性、容性）判別，正、逆相序判別指示功能；超限報警功能；列印記錄功能和負功檢測及處理功能。 -
At present, the electrical railway traction load in our country has great influence on power factor, negative sequence and hypo _ harmonics
電力牽引負荷對電力系統的影響主要反映在功率因數、負序及高次諧波。 -
Harmonics, reactive power, voltage flicker and negative - sequence current of power grids can affect the power quality and harm the power equipment badly
摘要電網中存在諧波、無功、電壓閃變及負序電流等問題，嚴重影響電能質量，危害電力設備。 -
Unified power flow controller ( upfc ) is one of the most powerful and most promising controllers of facts. if we use upfc to control the transmission parameters, terminal voltage, line impedance and phase angle in normal situation and use it to compensate zero sequence and negative sequence currents when one of transmission lines is cut off, we can implement two phases operating in high voltage transmission lines, which can improve stability and reliability for the transmission system
統一潮流控制器（ upfc ）是功能最強、最具發展潛力的靈活交流輸電系統（ facts ）控制器之一，如果在常規條件下，用upfc實現輸電線路的電壓調節、移相、潮流控制、阻尼振蕩等功能，在發生單相永久性接地或單相斷路故障時，由傳統的三相跳閘改為單相跳閘，用upfc的並補來濾除兩端系統的零序和負序電流，用upfc的串補來提高輸電線的傳輸功率，以實現兩相長期運行，那麼輸電系統的穩定性、可靠性將大大提高。 -
On the analysis of the theory of instantaneous reactive power, the paper brings forward a new harmonic detection method based on multiple frequency transform. the detection theory of positive sequence harmonic and negative sequence harmonic is respectively proved in detail. the correlative concepts are defined and the simulation validates the feasibility of this method
本文在分析瞬時無功功率理論的基礎上，提出了一種基於倍頻旋轉變換的諧波測量方法，分別針對正序和負序分量，從理論上證明了該方法能分離出單個的諧波，給出了相關量的定義，最後通過模擬驗證了該方法的有效性。 -
At present, low power factor, abundant harmonics and negative sequence are the three main characters of electrical railway traction load
功率因數低、諧波含量大和不對稱性是現代電力牽引負荷的三大技術特點。 -
Active power filter ( apf ) is an advanced power electronic device ， which can be used for compensating harmonics, reactive power and negative sequence current. compared with conventional compensation devices, active power filter has advantages of real - time and accuracy
有源電力濾波器是一種新型諧波、無功補償裝置，和傳統的補償裝置相比，有源電力濾波器具有很大的優勢：可以對諧波、無功以及負序電流實現實時、準確的補償。 -
The following is the main works and conclusions of this thesis. the novel upfc needs high power rate because it is generally used in high voltage transmission lines. after studied high - power converters and the literatures of upfc, the main circuit topology of novel upfc base on diode - clamping multilevel inverter is presented and the principle of using novel upfc to eliminate zero sequence and negative sequence currents is analyzed
本文所做的主要工作及得出的主要結論如下：由於upfc一般用於高壓輸電線，其功率等級要求很高，在綜合研究大功率變換器和upfc現有文獻的基礎上，提出了基於二極體箝位多電平變換器的新型upfc的主電路拓撲，分析了用其來濾出高壓輸電線非全相運行時所產生的零序和負序電流的原理。 -
On the calculation, we can hold the conclusion that the two kinds of compensators have no distinct difference at the technical aspect under circumstances of two - phased compensation. the effect of decreasing negative sequence current and harmonics ratio is indistinct, however, both are effective in increase power factor
通過模擬發現，這兩種補償方案在技術方面的差別不大：兩相補償模式下，在降低負序和濾波方面，效果都不明顯；對提高功率因數的作用顯著。 -
Considering the random fluctuation traction load ( from 0 to max, variable at every minute ), the life limit of all kinds of machine switches and expensive cost and complex overhaul of svc, this paper aims to develop a set of svc suitable for the present condition of our country. in order to resolve the reactive power returning back problem and realize static adjustable compensation to improve negative sequence
本文針對電氣化負荷變化頻繁、 svc價格昂貴及檢修復雜、機械開關無法擔負頻繁操作任務的現實，提出通過改造svc結構，把tcr改為tsr ，把tsc實現粗調、 tcr實現細調改為由tsc調節欠補無功、 tsr調節過補無功的技術方案。 -
Those algorithms are reviewed, and their disadvantages are proposed. this thesis provides a new approach for protecting power transformers. the technique uses positive - and negative - sequence impedance and variation of magnetizing impedance, where phase voltages are used
本文從機理上對變壓器保護進行新認識，將電壓量引入了變壓器保護中，採用了基於序基頻阻抗突變量和勵磁阻抗變化的變壓器保護方法。 -
Having lower and unified positive ( negative ) and zero sequence impedance, which benefits to improve the power supply quality
具有較低而有均勻的正（逆）充和零序阻抗，它有利於改善供電品質。
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