Location:
Search - power point
Search list
Description: This paper proposes a new algorithm for localizing phase to ground faults in an electric power distribution system. Fault-originated traveling waves propagate along the distribution
paths in both directions away the fault point and are reflected at line terminations, junctions between feeders, laterals, and the
fault location. Depending on the paths which traveling waves reciprocate through, the transient signal at each node contains certain path characteristic frequencies (PCFs).-This paper proposes a new algorithm for localizing phase to ground faults in an electric power distribution system. Fault-originated traveling waves propagate along the distribution
paths in both directions away the fault point and are reflected at line terminations, junctions between feeders, laterals, and the
fault location. Depending on the paths which traveling waves reciprocate through, the transient signal at each node contains certain path characteristic frequencies (PCFs).
Platform: |
Size: 1060864 |
Author: mohsen |
Hits:
Description: 程序用于求解电力系统最优潮流，采用原-对偶内点算法，并辅以文献，有利于对内点法的学习。-Procedures for solving optimal power flow, the use of primal- dual interior point algorithm, supplemented by literature, internal point of law in favor of learning.
Platform: |
Size: 1055744 |
Author: 刘佳 |
Hits:
Description: 基于粒子群算法的电力系统负荷分配问题（1）数学模型：
以IEEE 3机6节点为工况模型 ，Load=850MW
（2）目标函数：
minF=∑(i=1，Ng)Fi(PGi)，Fi(PGi) =aiPi2+biPi+ci+Ei，考虑阀点(Valve-Point)效应
（3）约束条件：
a.发电机组输出功率上下限约束，即PGi min<=PGi<= PGimax；
b.电力负荷平衡约束，忽略网损，即∑(i=1，Ng)（PGi）= PGD-Based on particle swarm optimization of power system load allocation problem
Platform: |
Size: 2048 |
Author: 石娟 |
Hits:
Description: 51小车程序运行效果：将小车置于一个桌面上(桌面请不要使用黑色)。打开电源的开关，小车开始前进运行，同时运行指示灯闪亮，这时如果前方有障碍物(或走到悬崖处)，小车将会先进行后退一段时间，并有蜂鸣器报警，再向左转一段时间，最后开始向前运行、左转、后退、右转、可以通过前方指示灯来观察。这时你可以能过声控(如拍手声)来让小车停止和开启.同时你也可以用遥控来控制小车的运行。按“1”，小车将向前运行，按“2”小车将后退，按“3”小车将左转,按“4”小车将右转.按其它(0-9)键，小车数管码显示相应的数字符号。按电源键，小车将会停止运行。同也可以用电脑将小车发送数字信号。其数码管也将显示相应的数字(0-9)。并执行相应的功能。当然S1、S2 也是起作用，分别用于控制小车的停止和开启。(注意：操作时应在小车前进时操作，后退、左转、右转等操作时，没有写相应的查询程序)-Effect of the running procedures 51 car: place car on a desktop (desktop do not use black). Turn on the power switch, the car started running, and running indicator light flashes, then if obstructions in front of (or over the cliff), the car will be going back for some time, and buzzer alarm, then make a left turn for some time, finally began running, turn left, backward, right, and can be observed through the front led. At this point you can have voice-activated (such as clapping) to make the car stop and start. at the same time you can also use the remote control to control the car s run. Press 1 , the car will move forward to run, press 2 car will be back, press the 3 car will be left, press 4 cars will turn right. in the other (0-9) key, car number control code display the corresponding number symbols. Press the power button, the car will stop running. Computer cart can also be used to send digital signals. The NIXIE tube displays the corresponding number (0-9). And perform
Platform: |
Size: 4096 |
Author: 黄林其 |
Hits:
Description: 此代码是《现代电力系统分析》王锡凡版的潮流优化计算的相关内容内点法的实现。-This code is the realization of analysis version of Wang sifan flow optimization related content calculation of interior point method for modern power system.
Platform: |
Size: 4096 |
Author: liuran |
Hits:
Description: 充分地利用了DSP强大的信号处理能力和现代数值分析方法。 设计了电能表前端采样及计量模块的硬件，以及一套符合国标GB/T 17883-1999的 0.2S
级精度要求的算法，同时扩展了谐波分析功能。系统概述为：三相电压、电流
AD 采样，采样数据通过串口送至处理器(DSP)，由 DSP 对采样数据作电参数计
量和谐波分析，处理结果通过定制 LCD 显示，并通过脉冲口发出有功、无功校
表脉冲。DSP 采用 ADI 公司的 BLACKFIN531-16 位定点芯片，最高处理能力可
达 800MIPS， 采样芯片为 16bit 的AD73360， 支持六通道同步转换， 无同步误差。数字化、高精度、创新性和可扩展性是本项目的特点，准同步采样算法和谐波分
析是本项目的新颖之处。-Make full use of the DSP powerful signal processing ability and the modern numerical analysis method. Design the
Watt-hour meter front sampling and measuring module of hardware, as well as a set of accord with national standard GB/T 17883-17883 of 0.2 S
Accuracy of algorithm, at the same time extend the function of harmonic analysis. System overview: three-phase voltage and current
The AD sampling, sampling data via a serial port sent to the processor (DSP), electric parameter meter by DSP of the sampling data
Quantity and harmonic analysis, process the results with a custom LCD display, and through pulse mouth making active and reactive power
Table pulse. DSP adopts BLACKFIN531 of ADI company- a 16-bit fixed-point chip, the highest processing capacity
Up to 800 MIPS, sampling chip AD73360 for 16 bit, supports six channels synchronous conversion, no synchronization error.
Digital, high precision, innovative and extensibility ?
Platform: |
Size: 680960 |
Author: jz |
Hits:
Description: Matlab与数据库链接有三种方法，本文只讲述其中以ODBC的方式进行链接。
本文件包含四部分，其中第三部分为我自己写的一些数据库函数操作的函数，第四部分为网上的一些资料。
-More than one power supply at the same time, the rectifier and inverter and bypass system are redundant configuration resistance
Load capacity with decentralized bypass system, there is no single point of failure, is the real full redundancy Yu Jiegou, reliability
The maximum expansion and online.
Its disadvantage is high cost.
Platform: |
Size: 168960 |
Author: 陈刚 |
Hits:
Description: 鉴于分布式光伏发电井网系统的电压稳定性对现实生话有重要意义.从下程角度给出380/220 V低压
配电网电压失稳的实用判抓.运用I SC 八I>软件构建了一个分布式光伏电源接入0. } kV配电网的3竹点系
统仿真模型.在此基础上分析了负荷增加、光照强度突降、环境温度增大以及负荷母线发生短路故障等扰动对
负荷电压稳定性的影响。仿真结果表明.当负荷电压接近电压稳定限定伯正常运行时.光照强度突降会使负
荷母线电压失去稳定:温度变化对负荷电压的影响甚微:短路故障消除后负荷母线电压则能够快速得到恢复.
不会导致电压失稳。-The voltage stability of distributed photovoltaic generation system has a significant role in actual life. }hhc
practical criterion of voltage instability for the 38()一220 V low-voltage distribution network was discussed the vicw-
point of engineering. hhe PSC 八I} software was used to build a()} kV 3-bus distributed network simulation model contai-
ning a grickconnected distributed photovoltaic power. ()n that basis.the influences on the load voltage stability were ana-
ly}ed by considering various disturbances, such as the growth of load·sudden reduction of light intensity, rise in environ-
mental temperature and the short circuit fault of the load bus. Simulation results show that when the load voltage is ap-
proaching the limit of voltage stability, the sudden reduction of light intensity will make the load bus voltage lose stability
while the influence of temperature change is very tiny the load bus voltage will recover the original value quickly after the
short circ
Platform: |
Size: 120832 |
Author: 高抢 |
Hits:
Description: BP神经网络用于风功率预测，可以仿真出风功率以及每个点的误差-BP neural network is used to predict wind power, wind power can be simulated and error for each point
Platform: |
Size: 2048 |
Author: |
Hits:
Description: The paper presents an in situ parameter estimation method to determine the equivalent circuit parameters of the three-winding
transformer (TWT). The suggested method also estimates geometrically a complex parameter that is mutual leakage between
secondary and tertiary windings, which would be useful in transient studies. Beside the saturation effect of the transformer is taken
into account by estimating a highly nonlinear parameter that is magnetizing circuit reactance. Different search based optimization
tools are applied for parameter estimation among which the results obtained using genetic algorithm is found to be encouraging.
Load test data at one particular operating point namely supply voltage, load currents, input power, and load impedance is suffi cient
to estimate the parameters.
Platform: |
Size: 129024 |
Author: fouzirock |
Hits:
Description: In this paper, an overview of power-electronic based devices for mitigation of power quality phenomena is given. The concept of
custom power is highlighted. Both devices for mitigation of interruptions and voltage dips (sags) and devices for compensation of
unbalance, flicker and harmonics are treated. The attention is focused on medium-voltage applications. Details about field
experience are given and recent research results are reported. It is shown that custom power devices provide in many cases higher
performance compared with traditional mitigation methods. However, the choice of the most suitable solution depends on the
characteristics of the supply at the point of connection, the requirements of the load and economics.
# 2003 Elsevier Science B.V. All rights reserved.
Platform: |
Size: 651264 |
Author: 杨松 |
Hits:
Description: 电力系统中多通道同步采样ADC（AD7606）与浮点DSP（ADSP-21479）通信的设计与实现-Multi-channel synchronous power system design and implementation of sampling ADC (AD7606) and floating point DSP (ADSP-21479) communications
Platform: |
Size: 208896 |
Author: zdy |
Hits:
Description: A 16-QAM signal X, whose power is normalized as unity, is transmitted with OFDM over the discrete-time channel model h which has been used in Homework #2 and #3. As depicted in the below figure, the transmitter (TX) is now equipped with an N-point IDFT and the receiver (RX) with an N-point DFT, along with adding cyclic prefix (CP) and removing CP removal, respectively. The complex AWGN n is set with 20 dB SNR. Suppose that N=256 and the length of CP is 64. Assuming the OFDM system works with perfect synchronization. -Generate two pseudo random (PN) sequences for X, each with a length of 256 samples which are taken {+1,-1}, and add them before the 16-QAM data with a proper CP. The OFDM frame is depicted in the following figure. PN1 and PN2 are used for channel estimation now. Suppose the PN patterns are known at RX. Use the least squares (LS) method to estimate the channel by averaging the results obtained individually PN1 and PN2. (When perfoming the DFT window for the received signal at RX, you need to notice that the channel results in a delay of 22 samples.)
Platform: |
Size: 210944 |
Author: 淘爱57 |
Hits:
Description: 通过解波动方程计算一根普通弦的振动方式，计算弦上某个位置的时间信号，并计算其功率谱，-By solving the wave equation of a string, we obtain the way of how it vibrates and get the signal of some point in the string and we finally calculate it power spectrum
Platform: |
Size: 2048 |
Author: zhong |
Hits:
Description: 含大规模电动汽车的配电网保护技术研究，文章的切入点较新，学习继电保护的朋友可以参考-With large-scale electric vehicle power distribution network protection technology research, the breakthrough point of the article is new, friends can refer to relay protection study
Platform: |
Size: 288768 |
Author: starcool |
Hits:
Description: 电压的步进调节就通过键盘进行步进调节，可以实现“+”、“-”的步进调节，电压调节的范围为0V~18V，可以电压细调（即每步进为0.05V）和电压粗调（即步进为1V），A/D、D/A转换电路主要实现数字信号和模拟信号的转换而达到控制的要求。-This paper discusses the application of the single chip microcomputer control system applied in switching power supply method and principle, put forward switching power supply adjustable voltage regulator output point of view. That can realize switching power supply control regulation, and through the analysis of the working principle of voltage, voltage regulation method, A/D chip and the principle, so that the output voltage to achieve 0.1 ~ 15V step regulator. Finally draw the conclusion that the DC switching power supply under the control of single-chip microcomputer can output stable, adjustable DC voltage to the conclusion.
Platform: |
Size: 25600 |
Author: zhuahimeng |
Hits:
Description: This paper presents the modeling and implementation of a three-phase DSTATCOM (Distribution Static
Compensator) using STF (Self Tuning Filter) based IRPT (Instantaneous Reactive Power Theory) control
algorithm for power quality improvement. It is used for harmonics elimination, load balancing and
reactive power compensation at distorted PCC (Point of Common Coupling) voltages under nonlinear
loads. An adaptive fuzzy logic controller is used to control the dc bus voltage of VSC (Voltage Source
Converter) based DSTATCOM to improve the response and to reduce the overshoot and undershoot of
traditiona
Platform: |
Size: 27327488 |
Author: yangs |
Hits:
Description: This paper presents the modeling and implementation of a three-phase DSTATCOM (Distribution Static
Compensator) using STF (Self Tuning Filter) based IRPT (Instantaneous Reactive Power Theory) control
algorithm for power quality improvement. It is used for harmonics elimination, load balancing and
reactive power compensation at distorted PCC (Point of Common Coupling) voltages under nonlinear
loads. An adaptive fuzzy logic controller is used to control the dc bus voltage of VSC (Voltage Source
Converter) based DSTATCOM to improve the response and to reduce the overshoot and undershoot of
traditional PI (Proportional-Integral) controller under unbalanced loading conditions and supply voltage
fluctuations.
Platform: |
Size: 15247360 |
Author: yangs |
Hits:
Description: 基于网络模型，利用点网络原理，计算电网络中各节点的电压值-Web-based model, using point network theory, computing power voltage value of each node in the network
Platform: |
Size: 3072 |
Author: 刘凯 |
Hits:
Description: 包括了在c#和VB源代码。利用GPS卫星来确定当前位置,原子时间同步电脑时钟,坐标和投影库,本文将教你如何生成自己的地图。-In part one of this series, I described how to write an interpreter for raw GPS NMEA data. Part two described how to monitor and enforce GPS precision data to develop commercial-quality software. The articles includes source code in C# and VB.NET which harness the power of GPS satellites to determine the current location, synchronize the computer clock to atomic time, and point to a satellite on a cloudy day. Yet, even with all of this code, most developers still need a way to display GPS information along with other geographic features. With the help of my colleague Phil Smith, a lead developer of our “GIS.NET” mapping component and the “Geodesy.NET” coordinate and projection library, this article will teach you how to generate your own maps.
Platform: |
Size: 43008 |
Author: lhc |
Hits:
«
1
2
...
45
46
47
48
49
50»