直流电压

本文叙述了新型10V直流电压标准的工作原理及系统组成，介绍了9∶1哈蒙电压比较仪和高稳定恒流源的研制方法，并分析了标准装置的测量不确定度。

The paper describes the principle and configuration of the 10 V DC voltage standard , introduces 9 ∶ 1 Hamon voltage comparator and high stable constant current source , and analyses the uncertainties of the measurement system .

金属氧化物避雷器直流电压试验的几点要求

Several Requirements for DC Voltage Test of Metal Oxide Arrester

单片CMOS直流电压转换器

Monolithic CMOS direct current voltage converter

随着便携式电子产品的日益普及，直流电压转换器（DC-DC）芯片得到广泛应用。

DC-DC converters are widely adopted with the growing usage of portable applications .

同时也提出将用于通用型直流电压源逆变器的PWM波生成方法，经过同步处理后，可以应用到该交-交变频器中。

Meanwhile , the PWM generated methods of a universal DC voltage source inverter are applied to the cycloconverter after the synchronous process .

SPWM控制波形质量好，功率管开关频率低但直流电压利用率低。

The SPWM control has a good waveform but the DC BUS voltage utilization is low .

采用双环结构，用三个非线性PI环节实现了对整流器直流电压与功率因数的高性能控制。

The DC bus voltage and the power factor of the PWM rectifier are regulated by three nonlinear PI controllers with high performance .

三相PWM整流器可以做到输入电流正弦、单位功率因数、直流电压输出稳定，具有良好的动态性能并可实现能量的双向流动。

Three-phase PWM rectifiers have many virtues such as sinusoidal input currents , unity power factor , steady output voltage , good dynamics and bin-directional energy Flow .

该电路由两个Boost变换电路组成，既实现了正负两路直流电压输出，又完成了输入端的高功率因数校正。

The circuit consists of two Boost converters . It realizes dual positive and negative DC voltage output as well as high power factor correction in the input terminals .

分析波形特点，选择能反映故障特点的直流电压和直流电流信号进行S变换，提取故障有效特征组成故障样本。然后用SVM方法训练故障样本并进行分类测试。

Features of waves are analyzed and DC voltage & current signals which can reflect fault features are selected to be S transformed and then fault samples composed of effective features are extracted .

然而，传统的DPC开关频率不固定、直流电压存在静差、系统波动较大。

However , the traditional DPC have the disadvantages of variable switch frequency , larger system fluctuation and DC voltage static error existed .

仿真结果表明与传统的载波PWM法相比，本文所提出的载波反相交叠&开关频率优化PWM法的直流电压利用率更大，但这种方法的缺点是谐波较大。

The simulation results show that , the utilization of DC voltage of the phase opposition carrier overlapping switching frequency optimal PWM method proposed in this thesis is bigger compared with traditional carrier PWM methods .

UPFC直流电压控制是实现UPFC串联补偿控制功能的重要条件和前提，论文研究了UPFC的直流电压的智能控制方法。

UPFC DC voltage control is the precondition to realize serial compensation control . Intelligent method for DC voltage control was investigated deeply in the paper .

10V直流电压标准研究

Investigation of 10 V DC Voltage Standard

分析了APF谐波提取、电流跟踪控制、直流电压控制等各个环节的传递函数，得到了APF的设计方法并对用于飞机电网的APF的关键参数进行了设计，完成了飞机APF的整体实现。

The transfer functions of current detection , current track control and DC side voltage control are deduced in detail . The design method of APF for aircraft utility is educed .

前级DC-DC转换器结合跟踪最大功率方法实现了光伏系统始终保持在最大功率输出，而且可以使输出的直流电压维持在需要的值。

The DC-DC converter combined with the maximum power tracking of PV systems remains at the maximum power of the array , and keep DC voltage output at a desired value .

为了给智能仪表提供廉价标准电流信号输出接口，可以使用RC低通滤波器，从PWM中分离出与占空比成正比的线性直流电压信号。

To provide intelligent instruments with the cheap in-terface of the standard current sign , the RC low pass filter is used for producing a voltage signal which is proportion to PWM ` s duty rate from PWM .

高准确度100kV直流电压分压器

High Accuracy 100 by DC Voltage Divider

可以对0～500V电压范围内的交、直流电压进行较高精度的测量。

Can be0 ~ 500V voltage range AC and DC voltage measurements with high accuracy .

以抑制直流电压纹波和有功、无功功率的纹波分量为控制目标，本文提出了一种新型的直接在abc自然坐标系下实现的VIENNA整流拓扑的不平衡控制方案Ⅰ。

With the control objective of DC-link voltage ripples and low frequency ripples of input active / reactive power elimination , a novel abc natural frame control scheme I of VIENNA topology with voltage unbalances was proposed .

在主电路的选择上，本文选择了前级带Boost升压变换器的主电路结构，在前级升压环节先对光伏阵列输出的直流电压进行匹配，使其工作在最佳状态。

On the choice of the main circuit , the paper chose to boost converter front end with the main circuit structure , the first part of the first stage boost the output of the PV array DC voltage to match it in the best condition .

最大直流电压达到1200V，在放电线圈中心得到10T的磁场。

The maximum direct current voltage was up to ( 1 200 ) V and 10 tesla magnetic field was attained at the center of the coils .

详细分析了抑制直流电压波动的双电流控制方法，以改善三相VSR在电网不平衡条件下的输入输出性能。

Moreover , it analyzed method of the dual current control for suppressing the fluctuation of direct voltage , and proposed how to improve the input and output performance in case of unbalanced power networks .

该电路产生的0～10V程控可调直流电压，精度高，稳定性好，非常适合在高精度等级的标准信号源中作为直流电压基准。

This circuit can output program controlled highly precise and extremely stable 0-10V DC voltage , thus works perfectly as a high precision adjustable DC voltage reference device .

限流充电为恒流充电，在传统预测电流控制策略的双闭环基础上添加充电电流PI环形成三闭环控制，即主电路电流外环、直流电压PI内环和充电电流PI内环。

Current limiting charging is the constant current charging . Charging current PI loop is added in the double loop of traditional predictive current , then three closed-loop control is formed , which are current outer loop of main circuit , DC voltage inner loop and charging current inner loop .

测量电路将系统比例测量法与正交锁相放大技术相结合，把激励信号变换为直流电压提供ADC的基准电压及乘法器的分母控制电压，减小激励信号幅值波动在系统测量结果中引入的误差。

The measurement circuit combines the systemic scaling method and analog orthogonal locked-in amplifier . The excitation signal is transformed into direct voltage , which provides the reference voltage of analog-to-digital converter and the denominator control voltage of multiplier . The errors caused by amplitude fluctuation are minimized .

控制系统在传统的电流检测、直流电压平衡控制、SVPWM控制的基础上增加了电流预测、输出直流分量调节、无差拍控制等控制环节，丰富了控制系统的功能。

By means of adding current prediction , output DC component adjustment and dead-beat control to the traditional configuration , which ( usually ) consists of current detecting , DC voltage balancing and SVPWM control , the performance of the control system is remarkably enhanced .

其中，电流环采用常用的基于dq解耦PI控制，而电压环采用多层次的直流电压控制方案，分别在总体、单相、单个三个层面上对有功分布进行控制，实现了电容电压的稳压控制。

The current control strategy employs the common PI control method which is based on dq decoupling . And the capacitor voltage control uses the multilayer DC voltage control method which is able to control the active power distribution on general , phase and individual levels respectively .

提出了采用d-q轴旋转坐标系下的矢量控制方法，实现了发电机转速和无功的控制，以及逆变侧直流电压和交流电压的控制。

For the converter controller , vector control method in d-q rotational frame is employed , realizing the rotational speed and reactive power control of PMSG as well as the dc voltage and grid voltage control of inverter side .

在软件方面，考虑到SVPWM相对于SPWM具有较高的直流电压利用率，以及更适合于数字控制系统，本文在研究SVPWM控制原理的基础上，编制了基于SVPWM的开环控制程序。

On software part , thought that SVPWM is better then SPWM on the high voltage using rate , and it is more fit to be used on the numeral control system . In this paper we give out a motor control programme base on the theory of open-loop SVPWM .