Description: The analysis of unsymmetrical faults is similar to that of symmetrical faults, except that in the case of unsymmetrical faults, the three-phase power system is represented by its sequence networks i.e zero, positive and negative sequence. Also, the effects of Δ-Y transformers phase shift are considered in analyzing unsymmetrical faults. Platform: |
Size: 1024 |
Author:olutopsy |
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Description: Finding Maximum Contiguous Subsequence Sum using divide-and-conquer
approach-Given a sequence Q of n numbers (positive and negative), the maximum subsequence of Q is the
contiguous subsequence that has the maximum sum among all contiguous subsequences of Q. Platform: |
Size: 30720 |
Author:yuliqi |
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Description: A Discrete 3-Phase ProgrammableSource block is used to generate a 1 pu, 15 degrees positive sequence voltage. At t = 0.05 s the positive sequence voltage is increased to 1.5 pu. At t = 0.1 s an unbalance is introduced by adding a 0.3 pu negative sequence component with a phase of -30 degrees.
The magnitude and phase of the positive-sequence component is evaluated in two diiferent ways: 1) Sequence calculation of phasors using Fourier analysis and
2) abc to dq0 transformation.
Math Function and Trigonometric Function blocks are used to evaluate the magnitude and phase of the positive sequence from the d and q components:
V1 = sqrt(Vd^2 + Vq^2) , Phi1 = atan(Vq/Vd))
-A Discrete 3-Phase ProgrammableSource block is used to generate a 1 pu, 15 degrees positive sequence voltage. At t = 0.05 s the positive sequence voltage is increased to 1.5 pu. At t = 0.1 s an unbalance is introduced by adding a 0.3 pu negative sequence component with a phase of -30 degrees.
The magnitude and phase of the positive-sequence component is evaluated in two diiferent ways: 1) Sequence calculation of phasors using Fourier analysis and
2) abc to dq0 transformation.
Math Function and Trigonometric Function blocks are used to evaluate the magnitude and phase of the positive sequence from the d and q components:
V1 = sqrt(Vd^2 + Vq^2) , Phi1 = atan(Vq/Vd))
Platform: |
Size: 7168 |
Author:jurifa |
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Description: 同相牵引供电系统旨在实现电能质量的综合补偿。提出了一种基于同步坐标变换的电流检测方法，能实时准确地检测
出负载电流的基波正序有功分量、基波正序无功分量、基波负序分量以及谐波分量，为综合补偿提供了基础。电能质量的补
偿力度与设备容量之间存在非线性关系。提出补偿度的概念，并给出补偿度与电能质量参数的关系，通过给定电能质量期望
参数，实时调整负序、谐波以及无功补偿度，使得综合潮流控制器容量在各电能质量补偿参数之间得到实时优化配置，从而
实现同相供电系统容量优化满意补偿。理论推导和仿真结果验证了所提方法的正确性和可行性。-The cophase traction power supply system aims at achieving power quality comprehensive compensation．A current
detection method based on synchronous reference frame transformation is proposed．The method can decompose the load current
real-timely into fundamental positive-sequence active component，fundamental positive-sequence reactive component，fundamental
negative-sequence component and harmonic component，which lays a foundation for comprehensive compensation．There are
nonlinear relation between compensation strength of power quality and device capacity．The paper proposes the concept of
compensation degree and gives the relationship between compensation degree and power quality parameters．By giving expected
power quality parameters，it adjusts compensation ratios of negative，reactive and harmonics instantaneously，so that the IPFC
capacity can be allocated between power quality compensating parameters optimally and real-timely，thus achieving capacity optimal
satisfactory compensa Platform: |
Size: 1520640 |
Author:guodongjie |
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Description: 基于C#+winform开发的“回文判定”程序：对于一个从键盘输入的字符串，判断其是否为回文。回文即正反序相同。如“abba”是回文，而“abab”不是回文。此判定程序包含了三种判定方法：1、根据数组元素；2、利用栈先进后出，队列先进先出的特点3、分段检测。（已给出完整的代码注释）-Based on C#+ winform development "palindromes judgement" program: for a keyboard input from the string, decide whether it is reported. That same palindromes positive and negative sequence. Such as "abba" is reported, and "abab" is not reported. The judge program includes three convicted methods: 1, according to an array element 2, the use of advanced after a stack, queue advanced first out features 3, stage detection. (has given the complete code note)
Platform: |
Size: 28672 |
Author:欧玉斌 |
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Description: 给出了信号压缩通常的变换-量化-编码函数。DHT函数为离散DHT变换，是FFT变换的近似，其正反变换相同，克服了FFT复系数不利于存储的缺点。LLMAX函数给出了某x序列在固定比特下的最佳量化输出。熵编码函数为霍夫曼编码。-Gives the signal compression usually transform- quantitative- coding function. DHT DHT discrete transform function, the FFT transform approximation, the same positive and negative transformation, overcoming complex FFT coefficient is not conducive to storage shortcomings. LLMAX function x is given a fixed bit sequence in the optimum quantized output. Entropy coding function as Huffman coding. Platform: |
Size: 2048 |
Author:Sun |
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Description: 用于电力电子系统同步信号检测或故障分析的对称分量法正负序分离-Symmetrical components for the power electronics system synchronization signal detection or failure analysis of positive and negative sequence separation Platform: |
Size: 1024 |
Author:harven |
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Description: 考虑到不平衡电网条件下，传统锁相环的局限性，这里比较了几种基于正负序分离的锁相环着重基于陷波器的提取方式-Taking into account the unbalanced grid conditions, the limitations of the traditional PLL, where positive and negative sequence based on comparison of several separate PLL trap of focusing on ways to extract Platform: |
Size: 36864 |
Author:yang |
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Description: 实验1-顺序和分支结构的10个小程序：求三个数的中最大的数；求三角形面积；求不多于4位数的个、十、百、千位数；时间表；计算本息和；华氏温度和摄氏温度转换；求四个数的中最大的数；判断正负奇偶；成绩自费公费；加减乘除运算-Experiment 1- sequence and the structure of the branch of 10 small program: the biggest number in the number of three Triangle area For no more than 4 digits, ten, hundred, thousand digits Schedule Principal and interest and Fahrenheit and Celsius The biggest number of four number Determine the positive and negative parity Grades out-of-pocket expense You can multiply, add, subtract and divide Platform: |
Size: 3072 |
Author:jw |
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Description: 华北电力大学科技学院电力系统故障分析课 程设计。计算5节点电路图中各节点正负零序电压，以及ABC三相相电压，还有9条支路的正负零序电流，以及ABC三相相电流。-Course design of power system fault analysis in College of science and technology of North China Electric Power University. Calculate the positive and negative zero sequence voltage of each node in the circuit diagram of the 5 node, and the ABC phase voltage, there are 9 branches of the positive and negative sequence current, and the ABC three-phase phase current. Platform: |
Size: 245760 |
Author:dj |
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Description: 电网同步跟踪技术，自己搭的锁相环,可以运行出来。有频率跟踪，还有正负序分离-Grid synchronization tracking technology, take their own phase-locked loop, you can run out. There is frequency tracking, there are positive and negative sequence separation Platform: |
Size: 23552 |
Author:zhaosimin |
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Description: 对SVG进行MATLAB建模，采用正负序电流检测方法，电压环采用pid控制方法。(The MATLAB is modeled by SVG, the positive and negative sequence current detection method is adopted, and the voltage loop adopts PID control method.) Platform: |
Size: 86016 |
Author:19841107
|
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Description: 实现电压的正负序分离，进而进行不对称故障情况下的有功功率控制(The positive and negative sequence separation of voltage is realized, and the active power control in the case of asymmetric fault is carried ou) Platform: |
Size: 6144 |
Author:yellowroundround
|
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Description: 本文提出了一种新的多谐frequencyadaptive并网电源的同步方法转换器，不仅可以估计基波功率信号的正负序分量频率，对其他谐波频率序列部分的估计也很受用(this paper presents a new multiresonant frequencyadaptive synchronization method for grid-connected power converters that allows estimating not only the positive- and negative-sequence components of the power signal at the fundamental frequency but also other sequence components at other harmonic frequencies.) Platform: |
Size: 1683456 |
Author:Rubyloveflower
|
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Description: 讲述并网逆变器中全软件锁相环的设计与实现，，即检测基波正序分量的电网电压不平衡和扭曲的条件下。明确地,提出了一种积极的基于一种新的序列检测器双同步坐标系的解耦锁相环（双dq–PLL），完全消除了检测误差传统的同步参考框架（SRF–锁相环PLL）(and implementation of all software phase-locked loop in grid connected inverter is described, that is, detecting the positive and negative component of the fundamental wave under unbalanced grid voltage conditions. Explicitly, a positive decoupling phase locked loop (double DQ - PLL) based on a new sequence detector dual synchronous coordinate system (double DQ - PLL) is proposed, which completely eliminates the traditional synchronous reference frame (SRF - PLL PLL) for detection error.) Platform: |
Size: 4512768 |
Author:醚 |
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Description: 在电压不平衡时，进行锁相，与正负序分离，对负序分量进行处理，效果不太理想(When the voltage is unbalanced, phase-locked is carried out to separate the positive and negative sequence) Platform: |
Size: 31744 |
Author:好QIAO |
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Search - positive and negative sequence