| 1. | A kind of simple save main circuit for regulating voltage
一种简单节省的调压主电路 |
| 2. | The method of changing the transformer ' s ration and power regulating voltage are used in order to yield various levels of testing current accurately and quickly
试验中，为了快速准确的产生不同等级的试验电流，采用改变变压器变比与电动调压相结合的方法。 |
| 3. | Placing facilities for reactive power compensation can reduce network loss effectively as well as improve transmission capacity and regulate voltage profile
在配电系统中加装无功补偿设备，可达到降低网损的效果，此外还可以提高电网输送能力和改善电压质量。 |
| 4. | The interface utilizes the high - speed pu lse function of plc basic unit to realize the control frequency of pulse , pwm regulate voltage and to make use of drivers of step motor control step motor
利用plc主机模块的高速脉冲输出功能，控制脉冲频率的发生、 pwm脉宽电压的调节，并通过步进电机驱动器实现对步进电机高效控制。 |
| 5. | High regulating voltage accuracy , good dynamic performance , less voltage waveform distortion make this series generating sets with high efficiency , compact structure , convenient maintenance , reliable and long life operation and good economic performance
该系列机组具有调压精度高，动态性能好，电压波形畸小，效率高，结构紧凑，维修方便，工作可靠，使用寿命长，经济性能好等特点。 |
| 6. | The outer - loop adopting the voltage effective value feedback regulates voltage output and reduces the steady error of output voltage . the inner - loop control is inductance current feedback , which implements the stabilization of system , and limits the inductor current
外环采用电压有效值反馈,调节输出电压,内环采用电感电流瞬时值反馈,提高系统动静态特性,并对采用该方案的级联逆变器进行了全面分析。 |
| 7. | There is difference frequency measurement requirement for every part of pid regulating , difference between dynamic quality and static quality in response time and accuracy . according to these , it use the interrupt functions and high - speed counter of the simens s7 - 200 plc cpu226 basic unit and some peripheral circuit to measure frequency ; in software designed , the procedure frame of hydraulic - turbine governor and disperse process of parallel pid are analyzed , an improved pid algorithm is adopted to realize a pid regulation mode with variable structure and parameters ; the mechanical liquid - pressure system of the hydraulic - turbine governor is with electric - hydraulic converter unit of step motor . according to the drive character of five phase of response step motor , a variable frequency regulated voltage driver unit is designed in order to realize interface between plc and driver of step motor
本文利用s7 - 200plc自身的特点设计了频率测量单元，根据pid调节各个环节的特点，以及调速器动态特性、静态特性对频率测量的实时性和精度要求的不同，利用s7 - 200plc基本单元中内置的高速计数器以及相应的外围放大整形、分频电路，实现了水轮发电机组频率的测量；在软件上，对微机调速器的整个程序框架、并联pid的离散化过程进行了分析，选用改进的pid算法实现了变参数、变结构的pid调节模式；调速器的机械液压随动系统具有步进电机电液转换元件，采用五相反应式步进电机，根据其驱动特性设计了变频调压驱动器，实现plc与步进电机驱动器之间数字接口。 |
| 8. | The other way is to use a single - stage power processor to correct power factor and regulate voltage simultaneously . however , the technology has only been applied in low power of single - phase ac input and has no use in high power of three - phase . so , the three - phase high power supply as the main emi equipment is becoming one of the hot points in international research
目前，这仅在输入电源为单相的变换器中实现，而且不是软开关，仍存在emi ；对于污染问题更严重的输入电源为三相三线的较大功率的变换器，则未见报道，同时，三相大功率的电磁污染治理问题也成为国际研究的热点之一。 |
| 9. | Due to the complexity of the structure and control of cycloconverter - type three - phase hf link inverter for soft - switching based on phase - shift - controlled full - bridge mode , a simple and optimized vvvf control strategy is proposed . this control strategy includes : produced pwm by space voltage vector ( svm ) and equivalent carrier frequency fe = 1 / te are introduced into the pdm control of the cycloconverter ; softened equivalent pwm wave is generated at the notches of hf voltage pulses ; the harmonious control between regulating pulse width by phase - shifted angle and regulating voltage of equivalent pwm is to minimize the harmonics content of output voltage of the inverter
西安理工大学博士学位论文针对这种前级移相全桥软开关周波变流型三相高频链逆变器结构和控制的复杂性，提出了一种实现简单而整体优化的vvvf控制策略:将空间电压矢量产生p姗的方法svm和等效载波频率fe = 1 / te引入到周波变流器的pdm控制;按高频电压脉冲前后沿软化等效p翎波;用移相调节高频脉冲宽度和等效p姗调压协调控制逆变器输出电压，在满足输出电压条件下使谐波最小。 |
| 10. | We researched more than there energy - saving control techniques of electromotor such as follow compensation and star - trianular convert , thyristor regulating voltage , thyristor regulating voltage and filter , in the natural gas processing plants of middle of saertu carried through tests on air compressor sets , and made certain the optimized scheme of electricity - saving . 2
研究了跟踪补偿加星三角转换、晶闸管调压、晶闸管调压加滤波等三种电动机的节能控制技术，在萨中天然气处理厂对空压机机组进行了测试，确定了最优的节电方案。 |
