微机非线性励磁控制的理论研究

应用直接反馈线性化理论，结合实际应用，为发电机励磁系统设计了实用化的单机和多机统一的非线性励磁控制器，解决了电力系统的非线性特性在励磁控制器设计上的困难，使实现线性化的过程比微分几何更加简捷、清晰。通过合理的实用化过程，使所设计的非线性励磁控制器达到了分散控制的要求     

静止无功补偿器与励磁系统的鲁棒协调控制

针对电力系统的强非线性不确定性,本文应用直接反馈线性化(DFL)和H∞非线性控制理论,设计了一种静止无功补偿器与发电机励磁系统鲁棒协调控制规律,该控制器可以同时镇定发电机功角稳定和控制节点电压,仿真实例表明该协调控制方法是有效的。     

微机非线性励磁控制器的应用研究

非线性控制理论应用于电力系统稳定性的研究，已经引起了广泛的关注。但极少有在实际系统中应用的。文中针对采用直接反馈线性化理论设计的非线性励磁控制器，进行了全面的数字仿真动模试验和现场试验的研究，并在此基础上成功地使新研制的非线性励磁控制器进入实际应用，取得了很好的效果。     

用直接大范围线性化方法设计发电机的励磁控制器 第二部分 励磁控制器的设

应用第一部分所阐述的基本理论，本文对单机系统设计了非线性反馈补偿励磁控制器，并对有关问题进行了讨论，改进了所设计的励磁控制器，使之具有更好的控制特性，最后，本文还给出了对单机系统的计算机仿真和动模实验结果。     

非线性励磁控制器对电力系统稳定性的影响

对基于直接反馈线性化理论设计的非线性励磁控制器，进行了全面的数字仿真、动模实验和现场试验的研究。从不同的应用实例研究中，表明了非线性励磁控制器对电力系统的稳定性具有较大的改善作用。     

用直接大范围线性化方法设计发电机的励磁控制器 第二部分 励磁控制器的设计

应用第一部分所阐述的基本理论,本文对单机系统设计了非线性反馈补偿励磁控制器,并对有关问题进行了讨论,改进了所设计的励磁控制器,使之具有更好的控制特性。最后,本文还给出了对单机系统的计算机仿真和动模实验结果。     

双轴励磁同步发电机的微分反馈非线性最优励磁控制

本文在微分几何理论的基础上，提出了更简明、更适合工程用的面向多输入系统的微分反馈补偿物理精确线性化方法，解决了电力系统控制设计中的强非线性问题及鲁棒性问题，并据此推导了双轴励磁同步发电机的微分反馈非线性最优励磁控制规律。仿真结果表明，所设计的控制方式能较大幅度地提高系统的动态稳定性和暂态稳定性。     

SVC与发电机励磁的非线性状态PI协调控制

针对电力系统的强非线性和不确定性,运用非线性状态比例积分（PI）解控制直接对其非线性不确定对象设计了静止无功补偿器（SVC）与发电机励磁的协调控制器。该控制器避免了基于反馈线性化理论的非线性协调控制器由于数学模型的误差而影响控制器性能的缺点,所得的控制规律与系统运行点和网络结构完全无关。仿真计算表明,SVC与发电机励磁非线性状态PI协调控制器能有效地提高系统的暂态稳定性。     

汽轮发电机组轴系扭振的鲁棒非线性控制

提出将同步发电机及其励磁系统看做扭振励磁控制的执行元件,采用直接反馈线性化方法补偿其非线性因素,避免小偏差线性化模型的参数摄动问题,从而提高扭振励磁控制系统的鲁棒性.综合H∞扭振模态观测器、独立模态空间鲁棒控制器和非线性反馈补偿律,提出一种轴系扭振的鲁棒非线性控制策略,在大范围工况下具有一致的全局性能,并且3个组成部分可以分别独立设计;另外,可以方便地与常规非线性励磁控制律综合在一起,而不影响后者阻尼低频振荡的性能.以一台300 MW汽轮发电机组第1阶扭振模态的阻尼控制为例,通过仿真验证鲁棒非线性控制器的性能优于常规线性控制器.     

电力系统鲁棒非线性控制研究

本文结合状态反馈精确线性化方法和线性Ｈ∞控制理论提出了一种新的鲁棒非线性控制器的设计方法，依据这种方法设计了电力系统的鲁棒非线性控制器（励磁控制器和汽轮机调速），并就其特性及作用给予了讨论。     

Reaching phase free adaptive fuzzy synergetic power system stabilizer

In this paper, an adaptive fuzzy power system stabilizer is developed based on robust synergetic control theory and terminal attractor techniques. The main contribution consists in making the dynamic system insensitive to parameters variation. This aim is achieved using a new synergetic controller design such that power system states start, evolve and remain on a designer chosen attractor toward the equilibrium point therefore avoiding transient mode. Rendering the design more robust, fuzzy logic systems are used to approximate the unknown power system dynamic functions without calling upon usual model linearization and simplifications. Based on an indirect adaptive scheme and Lyapunov theory, adaptation laws are developed to make the controller handle parameters variations due to the different operating conditions occurring on the power system and to guarantee stability. The performance of the proposed stabilizer is evaluated for a single machine infinite bus system and for a multi machine power system under different type of disturbances. Simulation results show the effectiveness and robustness of the proposed stabilizer in damping power system oscillations under various disturbances and better overall performance than classical PSS and some other types of power stabilizers.     

A nonlinear geometric approach to power system excitation control and stabilization

In this paper, a unified approach to the design of a nonlinear excitation controller/power system stabilizer for a synchronous generator/infinite bus power system is presented. The approach is based on a form of state feedback linearization, known as input–output feedback linearization, which provides an exact semi-global state transformation that is valid for a large class of operating points of the power system. With this transformation, the terminal voltage becomes a linear function of the control input. The excitation controller/power system stabilizer is then synthesized by using linear controller design techniques. The controller is proven to provide small signal stability and to provide local asymptotic tracking of admissible constant reference signals for a large class of operating points. A procedure is given to tune the controller gains to provide significant damping of the power angle oscillations.     

交直流电力系统非线性鲁棒直流调制控制器设计

随着“西电东送、全国联网”战略的实施,大区之间通过交直流并列运行输电系统实现电网互联。性能优良的直流调制控制器可以快速有效地调节直流联络线的输送功率,减轻交流输电系统的暂态输电压力,以提高交流系统的动态性能。以交直流并列电力系统为研究对象,采用基于扩张状态观测器的动态反馈线性化方法,将系统的非线性数学模型动态补偿为一个伪线性系统,然后利用线性鲁棒H∞理论进行控制器综合。仿真试验表明,当交流联络线发生三相短路故障时,给出的控制器能够有效抑制两侧交流系统的功角振荡,且对于系统不确定性表现出良好的鲁棒性,从而使整个交直流电力系统的暂态稳定性得到改善。与基于精确反馈线性化方法的非线性控制器相比,具有更为优越的动态品质。     

带电压调节功能的非线性鲁棒控制器

提出了一种既可增加多机电力系统暂态稳定性又可达到机端输出电压调节功能的非线性鲁棒控制器。该控制器由一个直接反馈线性化（DFL）控制器和一个比例积分（PI）控制器组成。DFL控制器用于降低多机电力系统的非线性程度以及各机之间的相互作用。所提控制器设计方法既可保证系统稳定性又可达到调节电压的目的,同时在实现时不需要测量发电机功角。仿真结果表明,所提出的方案可在很宽的运行范围内增加系统的阻尼及稳定性。     

UPFC状态反馈精确线性化潮流控制策略

统一潮流控制器(unified power flow controller,UPFC)传统线性控制器的性能可能因运行点的大范围变化而恶化,针对该问题提出了一种基于微分几何状态反馈精确线性化理论的UPFC非线性潮流控制策略。通过选择李雅普诺夫型输出函数、适当的非线性坐标变换和状态反馈将UPFC的5阶非线性系统完全转化为一个线性系统,然后采用线性极点配置方法设计了UPFC内部潮流控制器。IEEE 118节点系统的仿真对比结果表明,所提UPFC潮流控制策略改进了传统PI控制近似线性化的缺陷,有效适应了UPFC控制范围的大幅度变化,在提高电力系统暂态稳定性方面的效果明显优于传统PI控制。此外,该控制策略设计过程可以应用于所有基于电压源型换流器(voltage source converter,VSC)的柔性交流输电系统(flexibleAC transmission system,FACTS)装置。     

Feedback stabilization for AC/DC power system with nonlinear loads

In view of the nonlinearity of loads and HVDC in power systems, the M derivative, M bracket and multi-input multi-output (MIMO) feedback linearization based on nonlinear differential algebraic system (NDAS) are introduced into the design of nonlinear controller for parallel AC/DC power system. Bronovsky normal form for NDAS is derived when the M relative degree of NDAS is less than its dimension and certain designated conditions are satisfied. The control laws of both the excitation system and the rectifier current control for AC/DC system are studied in depth which combine the input-output linearization technique and zero dynamics design theory for NDAS. The simulation for a single-machine infinite bus system (SMIBs) with parallel AC/DC transmission lines shows that the nonlinear control (NLC) strategy is able to improve system dynamic performance for a variety of system operating conditions.     

Decentralized nonlinear H∞ controller for large scale power systems

The aim of this paper is to design nonlinear decentralized controllers for multi-machine power systems. The design procedure is based on H_∞ control theory and consists of two parts. First, the feedback linearization technique is used. Then, a robust controller is designed using the linear matrix inequalities (LMI) approach. The controller has two blocks. One, is a nonlinear function of some local measurable signals such as the generator active and reactive powers, the rotor speed and the armature current. The other block is a PID controller. The linear H_∞ theory is used to tune the PID parameters. The method results in a controller which is easy for implementing in practice. The performance of the controller is tested on a sample multi-machine power system model. Simulation results show the effectiveness, robustness and good performance of the proposed controller.     

可控串联补偿的神经滑模控制器设计

为克服电力系统可控串联补偿装置非线性及外部扰动影响,应用反馈线性化方法和径向基神经滑模变结构控制理论,设计了可控串联补偿的神经滑模控制器。通过状态反馈方法对非线性模型精确线性化,运用径向基神经网络的非线性映射和自学习能力自适应调整滑模控制律,使得设计的可控串联补偿控制规律简洁,鲁棒性好。仿真结果表明,与传统的控制方式相比,设计的神经滑模控制器能有效地阻尼系统振荡,增强系统的暂态稳定性,对运行点变化也具有较好的适应性。