基于MATLAB的同步发电机PSS与励磁系统仿真

在分析同步发电机励磁控制系统模型的基础上,研究了以电力系统稳定器（Power System Stabilizer—PSS）为辅助控制的同步发电机励磁控制方式,并基于MATLAB／SIMULINK构建了包含PSS的励磁控制系统的仿真模型。根据仿真结果分析在电力系统出现不同故障（三线短路以及断线故障）情况下带有PSS的励磁控制系统的控制性能,并与不加载PSS的励磁系统进行了比较,得到了在同步机励磁系统中加载PSS的必要性,为励磁系统的设计提供了依据。     

基于DSP的数字励磁调节器研究

目前广泛使用的同步发电机数字励磁调节器使用简单的单片机控制,采用PID（比例-积分-微分控制）＋PSS（电力系统稳定器）控制策略,励磁调节器体积大,模块间干扰大,速度低,可靠性差,很难保证产品质量达到标准要求。为了弥补这个不足,采用PID（比例-积分-微分控制）＋PSS（电力系统稳定器）＋NOEC（非线性最优励磁控制）综合控制策略,把DSP（TMS320F2812）用于同步发电机数字励磁调节器中,具有通用性强、结构简单的特点,同时可以实现优良的控制效果。     

同步发电机非线性励磁控制的逆系统方法

本利用非线性控制的逆系统方法，将大型同步发电机非线性励磁控制问题变换为一个相应的线性最优控制问题，设计出便于实现的非线性励磁控制规律。经仿真研究表明，所设计的控制律显地改善了电力系统暂态过程的动态响应，较大提高了静态稳定极限，有效地提高了电力系统的暂态稳定水平。     

基于PID预测函数的励磁控制研究

同步发电机励磁控制对提高电力系统稳定性起着重要的作用.当电力系统发生故障或受到扰动时,容易出现长时间的低频率振荡,严重影响系统的稳定运行.为了提高电力系统运行的稳定性,在讨论励磁控制现有控制方式和分析预测函数控制(PFC)算法和PID算法的基础上,将预测函数控制算法的性能指标构造成PID形式,推导出改进的PID型预测函数控制算法(PIDPFC),并应用于同步发电机励磁系统控制.通过仿真研究对比,在时域内分析了PIDPFC控制器的参数选择对系统控制性能的影响,取得了预期的结果,仿真结果表明了PIDPFC算法的优点.     

电厂发电机励磁系统的控制方法研究北大核心CSCD

为了更好地运用励磁系统对电力系统进行控制,将线性最优励磁控制应用到励磁系统。首先,采用古典控制方式,由PID+PSS控制的励磁系统对发电系统进行控制,由发电机的运转情况来观察古典励磁控制方式的控制效果;然后,采用线性最优励磁控制对发电系统进行控制,除了改变励磁控制器以外,其他都与原系统设置相同。并且,在系统稳定后加入短路干扰及突加负载的干扰,通过观察系统对干扰的反应来对比分析古典励磁控制和线性最优励磁控制的效果。实验结果表明,相对于古典控制方式,线性最优励磁控制可使振荡幅值更小,振荡时间更短,曲线更加平滑。     

基于GMR磁传感器的钢丝绳励磁结构设计

为实现钢丝绳无损检测设备对钢丝绳局部缺陷（LF）和截面损失（LMA）的检测,在基于GMR传感器的基础上设计钢丝绳励磁装置。通过高灵敏度GMR传感器的多层排布方式来减小漏磁信号中的干扰。对励磁方式提出永磁励磁法与直流励磁法相结合的复合励磁法,可很好地调整励磁强度,同时分析了励磁装置中各参数对励磁性能的影响,给出信号检测电路,总体设计可满足钢丝绳无损检测设备对LF和LMA的检测要求。     

基于Matlab的电力系统中发电机稳定性控制的研究

互联电网的传输能力和安全运行与电力系统稳定性密切相关,提高电力系统的稳定性一直是电网发展的重点.论文基于Matlab构建电网的仿真模型,模拟调速系统和励磁系统对发电机的控制作用.仿真结果表明,调速系统和励磁系统能对电力系统中的发电机进行有效的稳定控制,为实现抑制低频振荡,进一步提高电力系统的稳定性奠定了基础.     

基于STD—BUS实现的发电机励磁调节器

一、前言为了使发电机励磁系统向最优励磁控制及高可靠性等方面发展，我们将ＳＴＤ－ＢＵＳ计算机技术与现代自控理论结合起来，设计了一种双微机控制的励磁调节器，实现了调节智能化。该装置已在电站运行近一年，工作稳定可靠，调节品质优良，深得用户欢迎。二、系统硬件结构ＳＴＤ－ＢＵＳ励磁调节器，配置具有两套独立的微机通道，一套手动通道的调节器。调节系统硬件主体部份采用ＳＴＤ－ＢＵＳ结构，由ＳＴＤ－ＢＵＳ构成的控制系统有三个重要特点：即高可靠性、优良的环境适应性和模块化的开放式结构。这些在《微机励磁调节器》中得到…     

基于PSB的新型励磁控制器的研究

介绍了将迭代学习控制理论应用于同步发电机励磁控制中,通过迭代学习改善控制性能,具有结构简单,鲁棒性强的特点,改善了机端电压的品质.采用Simulink/PSB在单机-无穷大系统中进行了静态和暂态稳定的仿真研究,结果表明,该励磁控制方式的有效性,有利于提高电力系统的稳定性.     

基于交流跟踪的同步发电机最优励磁控制技术研究

针对同步发电机采用传统PID控制不能很好地满足电力系统对抑制振荡、提高动态稳定极限等方面要求的问题,提出了一种基于交流跟踪的同步发电机最优励磁控制方法;给出了基于拉格朗日方法的同步发电机励磁系统偏差线性化模型,分析了最优励磁控制量的确定方法,建立了基于最优励磁控制方法的同步发电机系统仿真模型。仿真结果表明,与传统PID控制方法相比,最优励磁控制方法能够实时控制同步发电机励磁系统,确保了同步发电机的输出稳定性。     

An improved Backstepping technique using sliding mode control for transient stability enhancement and voltage regulation of SMIB power system

The problem of transient stability and voltage regulation for a single machine infinite bus (SMIB) system is addressed in this paper. An improved Backstepping design method for transient stability enhancement and voltage regulation of power systems is discussed beginning with the classical Backstepping to designing the nonlinear excitation control of synchronous generator. Then a more refined version of this technique will be suggested incorporating the sliding mode control to enhance voltage regulation and transient stability. The proposed method is based on a standard third-order model of a synchronous generator connected to the grid (SMIB system). It is basically implemented on the excitation side of the synchronous generator and compared to the classical Backstepping controller as well as the conventional controllers which are the automatic voltage regulator and the power system stabiliser. Simulation results prove the effectiveness of the proposed method which ameliorates to a great extent the transient stability compared to the other methods.     

电力系统非线性切换励磁控制

针对反馈线性化方法难以同时提高电力系统的功角稳定性和电压调节特性的问题,提出了基于分层设计思想的非线性切换励磁控制方法.首先采用逆系统方法实现了系统的反馈线性化,然后根据Lyapunov函数方法对包含零动态的部分线性化系统设计了切换励磁控制器.在电力系统专用仿真平台上的仿真结果证明了所设计的切换控制器能够有效改善功角稳...     

计及螺旋桨负载的船舶电力系统协调控制设计

推进负载对船舶电网的暂态稳定性影响是船电系统的主要特征之一.本文基于非线性鲁棒L2干扰抑制控制方法,研究了具有螺旋桨负荷的船舶电力系统中的励磁与调速的协调控制问题,在充分分析了柴油发电机组的非线性数学模型及其螺旋桨负载的相互耦合的非线性动态结构特性的基础上,提出backstepping控制技术与L2干扰抑制相结合的综合协调控制策略来设计控制器.该控制器在保证系统稳定的条件下,有效地抑制干扰对发电机系统电压和频率的影响.仿真表明,在给系统突加螺旋桨负载的情况下,该控制器能有效地抑制负载对系统性能的影响,验证了控制器的有效性.     

Stability studies of multimachine power systems with the effects of automatic voltage regulators

The stability of power systems including the effects of automatic voltage regulators is studied via Lyapunov's direct method. The multivariable Popov criterion developed by Moore and Anderson is employed in constructing a Luré-type function for a power system consisting of synchronous machines interconnected by a lossless transmission system. The Lyapunov function constructed for the system with only flux decay is regarded as a special case of the result obtained in this paper. The effect of an automatic voltage regulator on power system stability is illustrated by numerical examples, showing some shifts of equipotential curves which are due to changes of voltage regulator gain.     

Improving power network stability and unit stress with adaptive generator control

The ‘steady state stability’ of the French power transmission system has been greatly improved by supplying additional signals to the voltage regulator. The control system parameters, including the additional signals, have been chosen in order to cover all the possible operating conditions and network configurations. These additional signals lead to an increase in the ‘steady state stability’ domain even with a regulator having constant parameters. Better results have been obtained using the model reference adaptive control method with an adjustable regulator. A method based on the ‘hyperstability’ approach has been used for the design of the adaptive control system because of its efficiency. Moreover, the adaptive control of generator excitation, using voltage, speed and active power as input signals, reduces the oscillations of the H.P. turbine valves when the generator is affected by network perturbations. Therefore, the wear of the units, in particular of nuclear units, could be reduced. The principles of this new type regulator are discussed and experimental results are presented.     

基于Hamilton函数方法的多机多负荷电力系统分散励磁控制

采用Hamilton函数方法研究了多机多负荷电力系统的励磁控制问题. 首先, 通过预置状态反馈完成了系统的耗散Hamilton实现. 然后, 基于该耗散实现形式设计了非线性分散励磁控制器, 分析了闭环系统的稳定性. 该控制器能充分利用系统内在的功率平衡特性. 仿真结果验证了控制策略的有效性.     

A power system nonlinear adaptive decentralized controller design

In this paper, a novel excitation control is designed for improvement of transient stability of power systems. The control algorithm is based on the adaptive backstepping method in a recursive way without linearizing the system model. Lyapunov function method is applied in designing the controller to ensure the convergence of the power angle, relative speed of the generator and the active electrical power delivered by the generator when a large fault occurs. Compared with the existing nonlinear decentralized control approaches, the proposed controller has no requirement for the bounds of interconnections in the power system. And the new approach does not need the existence of solution of a designed algebraic Riccati equation. Furthermore, the transient stability performance of power systems can also be improved by the designed control approach. The efficacy of the designed controller has been demonstrated in a multimachine power system. Simulation results show transient stability enhancement of a power system in the face of a large sudden fault.     

Stability analysis of PWM feedback control systems with PID regulators

Stability analysis is of great significance in those feedback control systems in which the power amplifier is operated as a pulse-modulator device, since under these circumstances the whole control system is highly non-linear. Stability in PWM feedback control systems with a proportional type regulator has been amply described in the literature. Only recently, however, have such studies been extended to include systems with a proportional-plus-integral regulator. In this paper the problem is considered for the case involving a PWM control system, where the regulator is a proportional-plus-integral-plus-derivative, the PWM modulator is of a very general type and the controlled process is of arbitrary order. The stability of the system is analysed by means of a discrete version of the second Lyapunov method ; this method in turn leads to an investigation of the positivity region of a quadratic form defined in the parameter space of the regulator. To improve the stability region obtained, a procedure is investigated whereby only a few parameters of the quadratic Lyapunov function need to be varied. The method proposed has proved extremely simple and flexible to apply, even in cases where the system is of arbitrary order.     

Adaptive H ∞ excitation control of multimachine power systems via the Hamiltonian function method

Using the Hamiltonian function method, this paper investigates the adaptive H _∞ excitation control of multimachine power systems with disturbances and parameter perturbations. A key step in applying the Hamiltonian function method to the multimachine system is to express the system as a dissipative Hamiltonian system, i.e. to complete dissipative Hamiltonian realization (DHR). By using pre-feedback technique, this paper expresses the multimachine power system as a dissipative Hamiltonian system. Then, the stability analysis of the achieved dissipative Hamiltonian system is proceeded. Finally, based on the achieved DHR form, the adaptive H _∞ excitation control of the multimachine power system is investigated and a decentralized simple excitation control strategy is obtained. Simulations on a six-machine system show that the adaptive H _∞ excitation control strategy proposed in the paper is more effective than some other control schemes.     

多机电力系统静态稳定分析的MATLAB方法

给出了多机电力系统静态稳定计算的建摸原理,推导了考虑励磁调节系统动态行为的全系统线性化状态矩阵公式,并设计了基于Matlab语言的运算程序。该程序可以计算系统特征值和每一特征值的机电回路相关比,可以满足多机电力系统低频振荡分析的需要。使用该文方法及其程序与电力科学研究院开发的电力系统分析综合程序（PSASP6．2）分别对EPRI-36节点系统典型算例进行计算比较。二者的全部特征值、机电回路相关比等计算结果完全一致,验证了所述方法正确、有效。