An approximate method is put forward to simulate low-frequency signal and generator response characteristic, from which motion models and damping parameters of main variables are obtained. 提出一种系统侧低频振荡信号的近似模拟方法,并应用于发电机响应仿真,获得了主要变量的运动模型和阻尼参数;
A dynamic signal is introduced for each subsystem to dominate the unmodeled dynamics and an adaptive nonlinear damping is used to counter the effects of the interconnections. 在观测器中对每个子系统引入一个动态信号来独立抑制未建模动态,同时用自适应非线性阻尼项来克服系统关联。
Based on the linearized equal area criterion and small signal analysis, the Principle and techniques of Energy Storage System ( ESS) Damping Power System Oscillations are proposed in this paper. 基于线性化等面积法则和小干扰分析方法,提出储能系统抑制电力系统低频振荡的原理和方法。
Allocation and feedback signal selection of wide-area damping controller in large scale power systems 大型电力系统中广域阻尼控制器的配置和反馈信号选择
By using test signal method, the sub-synchronous electrical damping characteristics of a generator and the impacts of the designed SEDC on the generators electrical damping are analyzed. 采用测试信号法,通过计算发电机组的次同步电气阻尼特性,分析所设计的SEDC对发电机组次同步振荡的抑制效果。
By making use of the correlation technique of pseudorandom signal, the on line identification of moving damping of displacer in a split cycle Stirling cryocooler has been carried out in this paper. 依据伪随机相关分析方法对分置式斯特林制冷机排出器的运动阻尼进行了在线辨识,提出了经过优化的辨识实验方案。
Chapter 2 introduces a method based on the test signal method to design TCSC power oscillation damping ( POD) controller. This method can overcome some disadvantages of the eigenvalue analysis method and has been proved to be effective by time domain simulation. 提出一种基于测试信号法的TCSC功率振荡阻尼(POD)控制器设计方法,克服了特征值分析法的一些不足,并用时域仿真证明这个方法的有效性。
By analysis of power system linear stability ( small signal), it is discovered that there is a poor damping in region eigenvalue mode between Henan grid and Hunan grid as well as a sub-poor damping of local eigenvalue mode in Henan grid. 经过系统小信号稳定分析发现,河南与湖南电网之间存在弱阻尼的区域振荡模式,河南电网还有次弱阻尼的局部振荡模式。
After concluding a theoretical relation between signal energy and damping ratio, the damping ratio can be determined. 推导出自由振动响应信号能量与阻尼比关系的理论表达式后,求出阻尼比。
Taking advantage of the attenuation of the real part of Laplace wavelet to recognize the freely decaying waveforms from signal so as to recognize correctly both damping and frequency. 该方法利用Laplace小波实部的衰减特性来识别信号中的自由衰减波形,从而实现阻尼、频率的正确识别。
The paper used PRONY filtering method that decomposes the signal by damping filtering, implements non linear filtering and directly computes the absorbing coefficient. 本文采用PRONY滤波方法,以阻尼滤波分解信号、做非线性滤波,直接求取目的层段的吸收系数。
It applied the adaptive filter to the vibration velocity signal, and efficiently improved the performances of the active constrained damping control. 提出利用自适应滤波技术对时变的振动速度信号进行滤波,提高速度反馈的主动阻尼控制算法的稳定性,实现悬臂梁振动的有效抑制。
An auxiliary control signal derived from fuzzy control theory is introduced to improve the damping characteristic of the system oscillations and improve the voltage characteristic by combining with AVR. 该控制器引入经可调整模糊控制规则推理得出的附加控制信号来改善系统的阻尼特性,同时结合自动电压调节器改善电压特性的。
Selection of Feedback Signal for Power System Damping Controller Based on Wide Area Measurements 基于广域信息的电力系统阻尼控制器反馈信号选择
This thesis discusses the strong and weak points as well as the development and present situation of power line carrier communication, and analyses the classification and characteristics of noises in the power channel and its effect on signal damping. 本文就电力线载波通信的优、缺点及发展现状进行了讨论,并分析了电力信道的噪声分类、特性及其对载波信号的衰减情况。
P-H model for small signal voltage stability analysis and voltage oscillation damping factor 小扰动电压稳定分析的P-H模型及振荡阻尼因子
Signal energy of a vibration system will be reduced because of the existence of damping ratio. 振动系统信号的能量之所以会衰减,是因为阻尼的存在。
Buzzer is driven by signal generator to create forced vibration in vacuum pump oil, the damping coefficient of the liquid could be extracted by measuring the resonance frequency of the vibrating object in the liquid, the liquid viscosity could be determined accordingly. 用信号发生器驱动蜂鸣片在真空泵油中产生受迫振动,通过测量液体中振动物体的谐振频率求得液体阻尼系数,进而确定了液体黏度。
In stead of spool displacement and output flow, which are not easy to be measured, pressure signal between the valve and a short damping hole is used in frequency response characteristic test of a electro-hydraulic proportional throttle valve. 采用被测阀与一阻尼短孔间的压力来替代难以检测的阀芯位移或输出流量,对电液比例节流阀进行频响特性测试。
A new test signal method based approach to design power oscillation damping ( POD) controller for TCSC is proposed, by which the bulky eigenvalue calculation of state matrix can be avoided. 提出了一种基于测试信号法的TCSC功率振荡阻尼(POD)控制器的设计方法,避免了计算量庞大的状态矩阵特征值计算。
According to the massive statistics obtained from the quantified pulse signal, the packet curve of the pulse signal on frequency domain appears a logarithmic damping trend, whose similarity with the actual one is greatly enhanced after the acupuncture. 由量化的脉象信号得出的大量统计数据显示,脉象在频域上的包络线呈指数衰减的趋势,并且针刺后其拟合率更高。
Meanwhile, wind power takes up higher and higher percentage owning to its unique advantages of no pollution, abundance in reserve, reproducibility, which brings a new subject to small signal stability and damping characteristic analysis on power system with wind power integration. 风力发电因为其清洁、储量丰富、可再生等优点,在现代电力系统中占有越来越高的比例,因此对风电场接入电力系统的小干扰稳定性及阻尼特性的分析成为一个新的课题。
Through analyzing the influence of system operating condition on participation factors and residues, it is indicated that the change direction of generator speed residue is just the same as its participation factor. This gives some clues to select the wide area feedback signal for damping controller. 分析了系统运行方式改变对参与因子和留数的影响,分析表明发电机转速的留数与其参与因子的变化趋势相同,这为广域反馈信号的选择提供了参考。
As a kind of controller, power system stabilizer is able to improve small signal stability by increasing the damping, which is installed in the generators mainly involved in the electromechanical oscillation modes. 从控制器角度来看,可以通过对机电振荡模式主要参与发电机组加装电力系统稳定器来提高阻尼进而提高系统的小于扰稳定性。
A residue index is proposed to select the feedback signal for damping controllers and its validity is verified by the value and phase of real residues. This residue index is very convenient for it just needs the left and right eigenvectors of characteristic matrix. 提出了用来选择信号的留数指标,并用实际留数的幅值和相角验证了该留数指标的有效性,该指标只需利用状态矩阵的左右特征向量,非常简便。
The proposed controller is easy to be carried out and eliminates the necessity of road signal as well as measuring damping force. 此控制器易于实现,不需要测量路面输入信号和减振器的阻尼力。
The analysis of small signal stability and damping characteristics of the power system containing wind farms becomes a very urgent issue. 对含有风电场的电力系统进行小干扰稳定性及阻尼特性的分析已经成为非常迫切的课题。
The free vibration signal can be get by the random decrement technique and the vibration frequency and damping ratios are detected. 运用随机减量法得到模型自由振动响应,进而识别模型的各阶自振频率和阻尼比。
The simulation results were as follows: optimal damping vibration isolation in the single-frequency signal input, low-frequency band close to the largest passive vibration damping vibration isolation effect of high-frequency band close to the smallest passive vibration damping vibration isolation effect. 仿真结果发现:优化阻尼隔振在单频信号输入时,在低频段接近最大被动阻尼隔振效果,在高频段接近最小被动阻尼隔振效果。
Access for the raised concern of large wind farm interconnection stability problems, the paper analyzes small signal stability aspects along with damping characteristics of the modern wind farms. 针对大型风电场接入电网引起对稳定性问题的日益关注,文章分析了含风电场系统小扰动稳定问题,研究了风电接入电网对系统的阻尼特性的影响。