| 1. | Pure sine wave output . current harmonic content is small
输出纯正弦波，电流谐波含量小。 |
| 2. | Realization of detecting current harmonics theory based on the instantaneous reactive power in dsp
基于瞬时无功理论的电流谐波检测算法实现 |
| 3. | In order to solve this problem , the power factor correction ( pfc ) pre - regulators are applied to limit the input current harmonics of the switching power supplies
为了限制谐波污染,用电设备需加入功率因数校正( powerfactorcorrection , pfc )装置。 |
| 4. | The standard bi - state magnetic bearing amplifier have some disadvantages such as high current harmonics , low reliability and the current mode switching for tri - state amplifier is expounded . the ba
从降低系统成本和提高可靠性的角度，提出了一种采用空间电压矢量控制的开关功率放大器，对其进行了仿真研究，指出了这种功放的应用前景。 |
| 5. | As the most effective means to eliminate current harmonics , active power filer ( apf ) can compensate dynamically harmonics whose frequencies and amplitudes vary ; moreover , its compensation characteristics is immune to the impedance variation of utility
有源电力滤波器是抑制电网谐波的有效措施之一，这种滤波器对频率和幅度都变化的谐波进行跟踪补偿，且补偿特性不受电网阻抗的影响，因而受到了广泛的重视。 |
| 6. | The extensive application of power electronics devices in power system 、 industry 、 traffic and family brings serious current harmonic , this harmonic pollution harms to system and electromagnetism environment . so power factor correction technology becomes a new research hotspot
随着各种电力电子装置在电力系统、工业、交通及家庭中的应用日益广泛,电网的电流谐波问题也日益严重,谐波污染给系统本身和周围的电磁环境带来了一系列的危害。 |
| 7. | The system had auto startup and stop function by software . the dsp based motor control system had lower current harmonic , more efficient use of supply voltage than spwm , less switch loss . on the other hand , this system make a lower noise for the pwm modulation . frequency is up to 20khz
本系统实现了电机的软启动、软关断功能，电机电流的谐波失真较少，电压利用率比常规的正弦波脉冲宽度调制( spwm )有了较大的提高，器件的开关损耗也得到了明显的减少。 |
| 8. | The research results show that the proposed active power filter can compensate both the current harmonic current source and the harmonic voltage source . in addition , the determination method of the main parameters is deduced , which can provide the theoretical basis for the design and implementation of the prototype
此外论文还推导出并联型混合有源电力滤波器主电路参数的选取原则和方法,为后续有源电力滤波器的设计和实验装置的实现提供了理论依据。 |
| 9. | As a result of employing multilevel phase - shifted method with zig zag connection in transformer secondary , in the primary the current harmonics their orders are lower than 6m 1 are eliminated ( m is the number of power cell each phase ) . in the inverter side because of using pulse shifting pwm control , the equivalent switch frequency of output is m times as high as one h - bridge , so the output voltage waveform of the inverter is near sine with less harmonics
对于整流电路，由于采用变压器移相多重化整流，在理论上可以实现曲折变压器一次绕组中低于6m 1次谐波电流相互抵消( m为串联单元个数) ；对于逆变电路，由于采用移相pwm控制方式，等效开关频率提高m倍，因此输出电压接近正弦波，谐波含量较小。 |
| 10. | Also a prototype for the boost two - level converter is built . the experimental results show that the boost tl converter has lower input current harmonics than the boost two - level converter , and it can satisfy the limits specified in rtca do - 160d . so the boost tl converter has the potential to apply in the future variable frequency ac airborne system ranged from 360hz to 800hz
并完成一台boostpfc变换器进行实验对比,实验结果表明,相比于boostpfc变换器, boosttlpfc变换器能有效地减小电流谐波使其满足相应的谐波标准rtcado - 160d ,所以它适合于即将采用360hz - 800hz变频交流供电体制的航空电网。 |
