从物理和数学的角度，对单相电路、三相电路瞬时有功功率和瞬时无功功率的概念进行了剖析。
From physical and mathematical points of view, this paper analyses the nature of instantaneous active and reactive power.
论述了利用瞬时无功功率理论从三相不对称电流中正确检测出三相正序有功电流，并用计算出的指令电流对系统进行补偿的原理。
Based on the instantaneous reactive power theory the method correctly detects the active positive-ord current from unsymmetrical currents and applies calculated command current to compensate system.
该互感器与PC机配合，可完成电力系统的谐波分析、鉴相、功率因数及有功、无功功率的分析计算。
And the transformer can carried out the analysis and calculation of harmonic, phase discrimination, power factor, active and reactive power together with PC.
三相同步发电机作为三相工业频率的交流电源，研究其有功功率调节具有重要意义。
It's significant to study the regulation of active power of three-phase synchronous generator by way of the alternating power source of three-phase industrial frequency.
实验表明，作为双馈感应发电机转子励磁电源的三相pwm变换器具有功率因数高、网侧电流谐波小、能量双向流等优点。
Experimental results show that three-phase PWM converters are advantageous in high power factor, small input-line current harmonic distortion and bi-directional power flow.
该供电装置主要为三相变单相的变压器结构，附加有功率补偿元件。
The power supply device is mainly in a structure of a three-phase to single-phase transformer and is additionally provided with a power compensation element.
该供电装置主要为三相变单相的变压器结构，附加有功率补偿元件。
The power supply device is mainly in a structure of a three-phase to single-phase transformer and is additionally provided with a power compensation element.
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