unity-power factor 中文意思是什麼
unity-power factor
解釋
單位功率因數-
With promulgation and obliging actualization of iec 1000 - 3 - 2 etc. international standards, power factor correction ( pfc ) technique become a hotspot of research in power electronics field. based on average current mode, the paper introduce the design and implementation of a fully digital controlled single - phase boost power factor corrector with fast response. the control - loop circuit is realized using digital control and the corrector can tend to unity power factor, lower current harmonics and high transfer efficiency
本文在平均電流模式控制的有源功率因數校正技術的基礎上，設計了一種控制電路基於數字信號處理器（ dsp ） 、主電路採用boost變換器拓撲結構的全數字單相功率因數校正器，用數字電路代替傳統的模擬電路來實現對整個迴路的控制，最終使得校正器具有輸入功率因數接近於1 、低電流諧波以及高轉換效率的特性。 -
This strategy has many advantages : solving the problems that the system is unsteady under super - synchronization ; improving power factor of stator ( it is unity relative to that of rotor ) ; no rotor position sensor and no initial position measurement, easily building up doubly fed speed adjustment system with speed sensorless because adjusting speed is taken in the rotor coordinate and rotor current vector fixing is implemented
該方案由於引入了定子電流勵磁分量的閉環控制，使系統同時具有轉速和勵磁調節兩個調節通道，具有如下優點：一、解決了超同步工作工況不穩定的問題；二、提高了定子側的功率因數（與轉子側功率因數為1相比） 。三、由於速度調節在轉子坐標系下進行，並以轉子電流矢量定向，所以無須轉子位置傳感器，也不用檢測初始位置，易於組成無速度傳感器雙饋調速系統。 -
The laboratory can provide calibration for 50 or 60 hz single - phase power factor meters with measuring range from zero to unity, leading or lagging
功率因數表本所可為頻率為50或60hz而測量量程由零至一超前或滯后的單相功率因數表提供校正服務。 -
Single - phase transformers up to 600 va, 5060 hz, unity power factor
600伏安以內、 5060赫茲、功率因素為1的單相變壓器； -
Single - phase transformers up to 600 va, 5060 hz, unity power factor and tests for transformer ( up to ip4x )
600伏安以內、 5060赫茲、功率因素為1及測試變壓器用（ ip4x以內）的單相變壓器； -
These studies in the thesis have been done as follows : it is proved that if the three - phase single - switch boost type power - factor - correction can work in continuous - current - mode, its power factor can not reach unity. therefore, it is not qualified for high power and high requirement application. according to the ac side equivalent circuit of the three - phase three - switch boost type power - factor - correction, the equations to realize unity power factor have been deduced and realized by integrate - reset - control circuit
本論文把積分復位控製成功應用於三相功率因數校正技術中，作了以下幾方面的研究： 1 .從理論上證明了三相單開關boost型pfc即使工作在ccm ，其功率因數也不能達到1 ，在大功率和對功率因數校正能力要求較高的場合，三相單開關boost型pfc達不到要求， 2 .根據三相三開關boost型功率因數校正交流側的等效電路，推導出實現單位功率因數所需的控制方程，並用積分復位控制電路進行實現，在理論研究的基礎上進行了模擬研究。 -
With the serious problem of harmonics pollution to the power system, as well as the need of high performance of ac drive application, three - phase pwm rectifiers have been as active research topic in power electronics recently, due to the virtues, such as sinusoidal input currents, unity power factor, steady output voltage, good dynamics and bin - directional energy flow
隨著電網諧波污染問題日益嚴重和人們對高性能電力傳動技術的需要， pwm整流技術引起人們越來越多的注意。三相pwm整流器可以做到輸入電流正弦、單位功率因數、直流電壓輸出穩定，具有良好的動態性能並可實現能量的雙向流動。因此， pwm整流器成為當前電力電子領域研究的熱點課題之一。 -
The laboratory offers calibration for single - phase wattmeters at fixed frequencies of 50 hz, 60 hz or 400 hz, and in the power factor range of unity to 0. 5 leading or lagging
功率表本所為固定頻率50hz ， 60hz或400hz及功率因數為1至0 . 5超前或滯后的單相功率表提供校正服務。 -
Basic calibration of a wattmeter will include tests at rated voltage and frequency with 5 different current settings on the current range ( unity power factor )
功率表的基本校正工作包括對額定電壓及頻率在其電流量程（功率因數為一）的五個不同電流值進行測試。 -
The result of simulation for the closed - loop system in the matlab illustrates that the system can provide unity power factor not only in ideal condition but also in the case of errors in missing of some current
研究表明系統在理想情況下能實現單位功率因數而且在某相電流誤差信號丟失的非理想情況下仍然能實現單位功率因數控制。 -
Unity power - factor test
功率因數等於1的電機試驗
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