The online variable step can also regulate the voltage convergence rate, and the phase-locked control circuit is designed to synchronously trace frequency and phase of power grid automatically. 在线调节步长改变电压收敛速度,设计锁相控制电路,自动同步跟踪电网频率和相位。
A new improved discrete variable voltage variable frequency equivalent sinusoidal control method is presented. 一种新的离散变压变频等效正弦控制方法被提出。
A New Coordination Variable for Automatic Voltage Control of Interconnected Power Systems 互联电网自动电压控制系统协调变量设计
Study on a novel multilevel SVPWM scheme An SVPWM Control Method Based on Variable Voltage Variable Freguency Control System 一种新型多电平SVPWM控制策略的研究一种变频调速系统的SVPWM控制设计
As the development of electric drive technology, especially variable-frequency speed control technology, the high voltage variable-frequency speed control technology for driving large capacity has been widely used. 随着电气传动技术,尤其是变频调速技术的发展,作为大容量传动的高压变频调速技术得到了广泛的应用。
Variable Voltage Speed Control with Half Soft Switching and Low Sinusoidal Distortion 高正弦度半软开关调压调速
Resonant high-voltage DC-DC converter with variable voltage and variable frequency control schemes 高压谐振型DC-DC变换器的调压调频控制方案
In this paper, according to the equation of voltage vector of single-phase motor operating at symmetrical condition, author presents a new voltage-vector PWM method of variable frequency control for single-phase motor. In system, the voltage vector is used as a control parameter. 本文根据单相电动机对称运行时的合成电压矢量方程,提出了以合成电压矢量为控制量的单相电动机电压矢量式PWM变频调速控制方法,并进行了计算机仿真及制作了单相变频器。
Abstract The beam pumping unit intelligent control device, which adopts Variable Voltage Variable Frequency ( VVVF), Programmable Logic Control ( PLC), power electronics etc. 游梁式抽油机智能控制装置是应用变频调速、可编程控制、电力电子等高新技术改造现有的游梁式抽油机,使其智能化。
Being a simple and reliable speed control system for AC inductive motors, the device features better performance than AC variable voltage speed control system does. 本装置的性能优于交流调压调速系统,是一种简单而可靠的交流绕线式电动机转速控制系统。
The beam pumping unit is modified into intelligent pumping unit by adopting variable voltage variable frequency ( VVVF), programmable logic control ( PLC) and power electronics. 在保留游梁式抽油机优点的基础上,采用变频调速、可编程控制和电力电子等高新技术将游梁式抽油机改造成为智能抽油机。
According as compare of voltage deviation and its variable ratio, optimal control of voltage and current is realized with querying fuzzy control sheet and adjusting adverse variable pulse width. 比较电压偏差及其变化率,查询模糊控制表,调节逆变脉宽,可实现电压及电流的理想控制。
This paper presents stator variable voltage speed control system for crane, including operating principle, speed control range, power distribution, resistor, s calculation, application and factors influenced on motor capacity. Several points which should be payed attention to are proposed. 介绍起重机定子调压调速系统的工作原理、调速范围、功率分布、电阻器的计算、系统的应用以及决定电动机容量的因素等,提出在调试中应注意的问题。
The variable voltage variable frequency ( VVVF) control of 3-phase induction motor for driving trolleybuses is expounded. Modeling, Simulation and Performance Analysis of Induction Motor of Electric Vehicle Using MATLAB/ SIMULINK 介绍无轨电车采用变压变频控制的三相感应电动机驱动技术。基于MATLAB/SIMULINK电动汽车感应电机建模仿真与特性分析
Simulation results show that the variable speed wind turbine with constant voltage control possesses obvious superiority in maintaining system voltage after the wind turbine is interconnected to power system. 仿真结果表明,恒电压控制的变速风电机组在维持风电场并网后的系统电压稳定方面具有较大的优势。
The article discusses simply the control theory of alternating current Variable Voltage Variable Frequency timing system, emphatically discusses the application of longdistance supervision control in elevator system. 文章介绍了电梯交流变压变频调速系统的控制原理,讨论了远程监控在电梯系统中的应用。
By adjustment to control signal, systems might realize variable voltage, variable frequency, steady voltage, steady frequency closed loop control. 通过对控制信号的调整,系统可实现变压、变频、稳压、稳频的闭环控制。
However, variable velocity variable frequency technology of medium-high voltage are not mature, having not been promoted and applied in large-scale, because the limit of device manufacturing process, control methods and the production cost. 但是受器件制造工艺、控制方法和生产成本的限制,中高压变频调速技术还不够成熟,没有得到大规模的推广和应用。
The overall results show that the rotor-side variable frequency is a solution to a practical scheme of low voltage control high-voltage motors, and also the basis of double-fed speed regulation. It has good prospects in the industry. 总的研究表明,转子变频一方面是一种解决高压电机低压控制的实用方案,另一方面也是双馈调速的基础,在工业中有很好的应用前景。
According to the difficulties in design, a detailed analysis is also given for the stepper motor speed control and the variable voltage and frequency control in rectifier control. 其中针对设计难点,步进电机的升降速控制和整流桥控制中的变频变压控制做了详细的分析。
Using slip frequency control method and SPWM, we give a general design scheme of the slip frequency variable voltage variable frequency control system. 运用转差频率控制方式和正弦脉宽调制算法,提出转差频率变压变频调速系统的总体设计方案。
Power flow equations and variable constraints are established, and objective function is established by most minimized active power loss. These three parts make up mathematical model for this problem of voltage and reactive power control. 根据县级电网电压无功的特点,确立电网的潮流平衡方程和变量约束条件,并且以有功网损最小为目标函数,建立电压无功控制问题的数学模型。
Variable voltage and variable frequency system based on vector control is applied widely in high speed train. 基于矢量控制的变压变频调速在高速列车中得到广泛应用。
Because the variable double-fed wind power generation system has its own voltage control syatem, it can effectively reduce the impact on voltage quality. But it uses the converter, which would result in harmonic pollution. 变速双馈风力发电系统由于其自身的电压控制能力,故可以有效的减少对电压质量的影响,但是由于其使用了变流器,从而会给配电网造成谐波污染。
Different reactive power controlling methods of variable speed constant frequency ( VSCF) wind turbines adopt different power flow calculations, and power flow calculations under the condition of constant voltage control as well as the condition of constant power factor control are respectively analysed and compared. 变速恒频风电机组不同的无功功率控制方式,其潮流计算处理方法也理应不同,本文对采用恒电压控制和恒功率因数控制下的潮流计算情况进行了对比。
Pockels cell is a variable wave plate controlled by voltage, the control voltage is about 800V. To drive pockels cell needs to design a specialized high-voltage driver module. 克尔盒是利用克尔效应,由电压控制的可变波片,其控制电压约800V,驱动克尔盒需要设计专门的高压驱动模块。