Performance Evaluation of Power Oscillation Damping Controller—Firefly Algorithm Based Parameter Tuning

This paper presents the performance evaluation of power oscillation damping controller based on firefly algorithm (FA) parameter tuning. The power system stabilizer (PSS), unified power flow controller (UPFC), and static synchronous series compensator (SSSC) are tuned with FA by minimizing integral time multiplied by absolute error (ITAE) as an objective function. An integrated multi-stage linear quadratic regulator – power oscillation damping UPFC/SSSC has been proposed with precise tuning of control parameters which results in overall states' oscillation damping as compared to other classical methods. It has been observed that the proposed control structure damps the oscillations adequately and is modular in design methodology. The sample power system comprising six areas has been considered to demonstrate the effectiveness of the concept. The software has been developed based on the proposed work by the authors and the MATLAB code has been generated in R2009b version. The states' inter-relation which has been shown with eigenvalues reflects a better regulation and the step response is also validated.     

Knowledge domain states mapping concept for controller tuning in an interconnected power network

This paper presents novel power system stabilizers (PSS) tuning approach with particles swarm optimization (PSO) driven knowledge domain states mapping for multi area power system. Tuning of PSS parameters has been done by PSO technique offline at different operating conditions as load dynamics change. The objective function for PSS parameters tuning is integral time multiplied by absolute error (ITAE). The sets of tuned parameters at different operating conditions thus obtained are termed as knowledge domain. The process is viewed as knowledge domain mapping. The dynamical system response has been linked with states, and if there is any violation from desired limits, control action is initiated and thus retuned control parameters obtained straight away from the respective knowledge domain helps to provide quick response and precise damping of signals of interest. Proposed concept also demonstrates that if one controller (PSS) fails to stabilize the system at certain operating condition then another controller (UPFC) connected in the system acts as supplementary controller in automation which assists PSS functioning and thus entire system operation improves by way of modulating the signal dynamics at interface points which quickly damps oscillations. The system study has been performed on a sample six area power systems comprising of UPFC connected between area two and three and PSS to all areas. The proposed concept demonstrates auto tuning of PSS for quick oscillation damping as the operating conditions change and also under situations of PSS failure due to relatively larger perturbation, UPFC acts as supplementary controller by assisting the entire system PSS to recover ensuring stability.     

导引头稳定平台控制回路设计分析

在稳定平台控制系统中分析了载体扰动产生的干扰力矩及对视线角引起的摆动,分析了选择不同的视线角速度输出点时对视线角速度、隔离度的影响及对控制系统传函的要求,为选择电机输出力矩、选择陀螺量程及控制系统传函的设计提供了理论依据.在分析的基础上构建了数字仿真试验系统,仿真表明视线角速度输出有较好的品质和较高的隔离度.     

IMC系统的优化滤波器研究

推荐两种滤波器作为ＩＭＣ系统的滤波器。一种是ＩＴＡＥ滤波器，它符合时间乘绝对误差积分值最小的优化原则，即Ｊ＝│ｅ│ｔｄｔ→ｍｉｎ。另一种是Ｂｕｔｔｅｒｗｏｒｔｈ滤波器，它具有很好的理想低通滤波器特性。由于这两种滤波器的全部结构极点均处于Ｓ复平面的高稳定性区域，又是按最优原理确定其参数，因此，采用这两种滤波器可以抑制模型失配导致的不良影响，使得ＩＭＣ系统的鲁棒性更加有保证。本文列举一个工业过程控制例     

基于ITAE最优控制的永磁同步电机矢量控制仿真

介绍了永磁同步电机(PMSM)的数学模型和矢量控制,在给出传统工程设计方法的同时,结合现今计算机辅助设计工具,通过MATLAB/Simulink的仿真手段,对PMSM矢量控制PI控制器参数进行ITAE最优化设计.经与传统工程PI控制器比较,基于ITAE的最优控制具有更好的控制效果.     

无线网络控制系统的Fuzzy-PD控制器设计与仿真

基于网络控制仿真软件TrueTime以及Matlab/Simulink环境构建了一个无线网络控制系统仿真模型,对系统模型和控制策略进行了仿真实验;设计了一种Fuzzy-PD控制器,提出了一种无线网络控制器参数离线优化的方法,即利用ITAE作为重要参考指标对Fuzzy-PD控制器进行离线调整,通过调整Fuzzy-PD控制器的转换参数改善控制器在不同网络带宽占用率下的控制性能。仿真结果验证了Fuzzy-PD控制算法优于传统的PD控制算法和Fuzzy控制算法。     

一种适用于复杂系统的智能控制新算法及仿真研究

提出一种基于改进遗传算法的自适应模糊控制 策略,通过优化控制器中非线性量化函数及自适应控制表达式等中的关键参数,得到基于加 权ITAE指标的满意控制．经过大量仿真研究,证明其对多输入多输出系统、混沌系统、滞后 系统等复杂系统的控制有良好效果．     

一类单容纯时滞系统二次优化控制

本文研究受控对象为Ｇａ（ｐ）＝Ｋ／１＋Ｔｐｅ＾－ＬＰ和Ｇｂ（ｐ）＝Ｋ／ｐｅ＾－ＬＰ二次优化控制，给出一个经验公式。用以确定二次优化控制器的优化参数，可以节省了大量仿真寻优机量，结果表明，二次优化控制兼有Ｓｍｉｔｈ预估器全补偿纯时滞和状态反馈两类控制器的优点，性能指标好，鲁棒性强，尽管Ｇａ（ｐ）和Ｇｂ（Ｐ）两者结构不同，但它们二次优化系统性能指标相近，一阶模型无超调，二阶模型σ２％≤２％，三阶模型，     

一种采用微机求取自控系统ITAE值的方法

自动控制系统中经常采用ITAE准则,但应用分析法求取ITAE值却是困难的,本文提出了一种采用微型机求取自动控制系统ITAE值的方法,较好地解决了这一难题。     

位移无静差ITAE最优传递函数的研究

位移无静差ITAE最优传递函数具有较好的平稳性和快速性,是一组适用于工程控制系统的最优参数。首先介绍了ITAE最优传递函数,然后研究了ITAE最优传递函数的极点分布、时域响应和频域响应,最后研究了ITAE最优传递函数的分母多项式系数与加权矩阵的关系。研究结果将大大促进ITAE最优传递函数的广泛应用,为进一步研究ITAE最优控制问题打下基础。