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: 故障突变量计算
12point滤序,需改为根据N自动确定滤序公式
设置故障突变量单相定值
设置故障突变量相间定值
设置故障突变量负序\零序电流定值- Fault calculation 12point mutations order filter is required to determine the filter order based on the formula N automatically set the amount of single-phase fault mutation set fault value value mutation set the amount of white mutant the amount of negative sequence fault \ zero sequence current value Platform: |
Size: 1024 |
Author:chao |
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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: 风力发电PSCAD仿真用得，在正转DQ坐标下，负序变换到正序模块-PSCAD simulation used wind power in the forward DQ coordinates, the negative sequence to positive sequence module transforms Platform: |
Size: 17408 |
Author:jack |
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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: 本文利用编写的MATLAB软件结合解析法证，分析了一种新型的接地距离继电器在系统振荡时再发生单相经过渡电阻接地短路时的动作特性。该接地距离继电器的动作判据是通过比较故障后测得的母线电压、补偿电压、零序电流和负序电流四个量的相位关系以确定继电器的动作行为情况
-In this paper, written in MATLAB software analysis and forensic analysis of a new type of ground distance relays in the system oscillation movement characteristics of single-phase transition resistance is shorted to ground. The operating criteria for the ground distance relay bus voltage is measured by comparing the failure, the phase relationship of offset voltage, zero sequence current and negative sequence current four amount to determine the relay actuation behavior
Platform: |
Size: 4850688 |
Author:nn0914 |
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Description: 2008年，自己做的电动机保护程序AD7656.c，可以测量负序电流和零序电流-In 2008, own motor saver AD7656.c negative sequence current and zero sequence current can be measured Platform: |
Size: 1024 |
Author:dengzhen |
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Description: 基于pscad的电气化铁路对周围发电厂负序影响的割集仿真模型，倾情奉献。-Pscad electrified railway based on negative sequence power plants around the cut set of simulation models Decent. Platform: |
Size: 11264 |
Author:ichooseilike |
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Description: 编写一个ieqiu字符串长度的函数，strlen（），再用strlen（）函数编写一个函数revers（s）的倒序递归程序，使字符串s逆序。-Write a ieqiu string length function, strlen (), then use strlen () function write a function revers (s) of the reverse order recursive procedure, make the string s negative sequence. Platform: |
Size: 1024 |
Author:晶晶 |
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Description: 为了更好地进行谐波和无功功率的补偿与控制，叶FBD(Fryze一Buchholz一DPenbrock)法的定
义进行了完善，并给出了补偿电流检测的直接法和间接法，在三相电力系统中对FBD间接法进行
了推广研究，利用参考电压进行投影变换，不仅可以检测出功率电流和零功率电流，还可以检测出
基波有功电流、基波无功电流、谐波电流以及任意次谐波电流等，大大拓展了FBD法的应用范围和领域。MATI一AB仿真和实验结果表明了所定义和推广的电流检测方法的正确性和有效性。
-In order to improve the performance of active power filter(APF) harmonic current detection method, a harmonic current detection based on FBD(Fryze-Buchholz-Dpenbrock) algorithm was proposed. Reference voltage was generated by phase locked loop(PLL), and load current was projected to reference voltage, and then the active power fundamental current, reactive power fundamental current, harmonic current, fundamental negative sequence current, any harmonic current and so on can be detected accurately by using low-pass filter(LPF), and in the case of distorted voltage, the method was also applicable. The simulation results verify the fast dynamic speed, high detection accuracy, simple implement and good project value of the proposed algorithm. MATLAB simulation results confirm the feasibility and validity of the method. Platform: |
Size: 251904 |
Author:卢锋 |
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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: FBD谐波检测算法可以快速有效地检测电力系统中的基波正负序电流和高次谐波电流-FBD harmonic detection algorithm can quickly and efficiently detect the power system fundamental positive Negative sequence current and harmonic current Platform: |
Size: 17408 |
Author:h |
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Description: 负序检测，采用了id-iq的检测方法，简单方便，效果好-Negative sequence detection, using the id- IQ test method, simple and convenient, the effect is good Platform: |
Size: 18432 |
Author:刘贝 |
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Description: In order to solve the power quantity problem of negative sequence current and harmonic current in high-speed railway, railway static power conditioner (RPC) was adopted. RPC contains two inverters which are connected with each other by sharing a DC capacitor, the negative sequence current and harmonic current can be restrained together by controlling the power of the two inverters. The structure and compensation principle of RPC was introduced, and the negative sequence current and harmonic current compensating reference detecting method for three-phase Vv transformer was presented. To maintain the DC voltage and compensate negative sequence and harmonic current, the DC voltage control and the current control for two inverters of RPC was presented. Simulations have confirmed that the RPC can achieve good performance under the negative sequence and harmonic current detecting method and the control strategy proposed in this paper. Platform: |
Size: 386048 |
Author:杨松 |
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Description: which are cascaded by bridge cells with delta
configuration (SDBC) and cascaded by chopper cells with
double star configuration (DSCC). The negative sequence
current compensation mechanisms of SDBC converter and
DSCC converter are different, it needs further study which kind
of topology is more to identify. This paper expounded the
negative sequence compensation principle of the SDBC-SVG
and the DSCC-SVG, and deduced the circulation current and
bridge arm currents mathematically. The correctness of the
derivation was validated by PSIM simulation. Through
contrastive analysis of bridge arm currents stress and the
installed capacity of two kinds of modular multilevel SVGs, it
was found that the negative sequence compensation
characteristics of DSCC-SVG are superior to SDBC-SVG. The
conclusion provides a theoretical reference for making
reasonable selection of negative sequence compensation
topology in engineering applications. Platform: |
Size: 430080 |
Author:yangs |
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Description: In order to solve the power quantity problem of negative sequence current and harmonic current in high-speed railway, railway static power conditioner (RPC) was adopted. RPC contains two inverters which are connected with each other by sharing a DC capacitor, the negative sequence current and harmonic current can be restrained together by controlling the power of the two inverters. The structure and compensation principle of RPC was introduced, and the negative sequence current and harmonic current compensating reference detecting method for three-phase Vv transformer was presented. To maintain the DC voltage and compensate negative sequence and harmonic current, Platform: |
Size: 1656832 |
Author:yangs |
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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: Against the serious overload situation of the Vx traction transformer secondary Side FN
winding serious problem of three-phase side of the negative sequence，the program of
replacing Vx traction transformer is put forward，and direct power supply scheme of
introducing the dual windings in parallel of W+晰m strengthen line is proposed，as well as
the balance compensation scheme．A detailed analysis of the balance compensation program is
carried out，and a based Smile Var Generator(SVG)traction transformer balanced Platform: |
Size: 3911680 |
Author:yangs |
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Search - negative sequence