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针对粒子群(PSO)优化算法辨识发电机模型参数时存在局部最优和后期收敛速度慢很难准确获取具有强泛化能力的模型参数的问题,提出了一种基于多粒子全局信息共享和变权重的全局信息融合PSO算法(GPSO),并通过IEEE3机9节点系统算例验证了该算法的有效性。结果表明,与常规PSO算法相比,该算法具有泛化能力强、辨识精度高和后期收敛速度快的优点。 相似文献
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由于传统的水轮机调速建模在引水系统部分无法较为准确地辨识参数,针对水力损失函数复杂的模型机理结构,通过黑箱辨识与曲线拟合的方法,搭建了水力损失函数精细化模型。通过改进型的粒子群算法对模型参数进行辨识,改善了粒子群算法收敛性与容易陷入局部最优等问题并用算例验证了模型与方法的有效性。 相似文献
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SOC的准确估计对提高电池的动态性能和能量利用效率至关重要,估计过程中,模型参数不准确以及系统噪声的不确定性都会对结果产生较大影响。为减小模型参数辨识和系统噪声对SOC估计精度的影响,本文采用二阶RC等效电路模型,结合自适应扩展卡尔曼滤波算法(AEKF)进行锂电池的SOC估计。用带有遗忘因子的最小二乘法对模型参数进行在线辨识,以减小由参数辨识引起的估计误差,AEKF可以对系统和过程噪声进行修正,从而减小噪声对SOC估计的影响。最后分别用EKF和AEKF进行SOC估计并比较其误差,结果表明,AEKF联合最小二乘法参数在线辨识具有更高的精度和更好的适应性。 相似文献
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为了更好地研究变压器油纸绝缘老化状态与拓展德拜等值电路参数之间的相关性,根据实测回复电压特征量参数等值电路模型,建立求解等值电路参数的数学模型,并将该模型转化为非线性优化问题,利用混合蛙跳算法的全局信息交换和局部深度搜索特性对拓展德拜等值电路参数进行参数辨识。通过两台变压器的辨识结果表明,与粒子群算法相比,由混合蛙跳算法辨识的电路参数计算获得的回复电压值与测量值具有更高的重合度,并能够准确地反映变压器油纸绝缘状态。 相似文献
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Kyun Ho Lee Seung Wook Baek Ki Wan Kim 《International Journal of Heat and Mass Transfer》2008,51(11-12):2772-2783
In this study, an inverse radiation analysis is presented for the estimation of the radiation properties for an absorbing, emitting, and scattering media with diffusely emitting and reflecting opaque boundaries. The repulsive particle swarm optimization (RPSO) algorithm, which is a relatively recent heuristic search method, is proposed as an effective method for improving the search efficiency for unknown radiative parameters. To verify the performance of the RPSO algorithm, it is compared with a basic particle swarm optimization (PSO) algorithm and a hybrid genetic algorithm (HGA) for the inverse radiation problem in estimating the various radiation properties in a two-dimensional irregular medium, when the temperatures are given at only four measurement positions. A finite-volume method is applied to solve the radiative transfer equation of a direct problem to obtain measured temperatures. RPSO is proven to be quite a robust tool for simultaneous estimation of multi-parameters even in a strongly-coupled environment. 相似文献
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针对传统外环控制器比例积分(PI)参数的选择需要经过长时间的调试且在大扰动下难以实时调节控制可能导致系统持续振荡的问题,提出了一种基于差分进化模拟退火粒子群优化混合算法(DESAPSO)的MMC-HVDC系统控制参数优化方法。基于MMC-HVDC系统的数学模型,在Matlab/Simulink平台上搭建MMC-HVDC系统仿真模型,采用时间绝对误差积分(ITAE)指标构建PI参数优化的目标函数,利用DESAPSO混合算法对PI参数进行优化。通过对比原参数、基于差分进化算法、模拟退火粒子群优化算法与差分进化模拟退火粒子群优化混合算法的优化结果,验证了该方法在MMC-HVDC控制系统参数优化中的有效性与优越性。 相似文献
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For a solid oxide fuel cell (SOFC) integrated into a micro gas turbine (MGT) hybrid power system, SOFC operating temperature and turbine inlet temperature are the key parameters, which affect the performance of the hybrid system. Thus, a least squares support vector machine (LS-SVM) identification model based on an improved particle swarm optimization (PSO) algorithm is proposed to describe the nonlinear temperature dynamic properties of the SOFC/MGT hybrid system in this paper. During the process of modeling, an improved PSO algorithm is employed to optimize the parameters of the LS-SVM. In order to obtain the training and prediction data to identify the modified LS-SVM model, a SOFC/MGT physical model is established via Simulink toolbox of MATLAB6.5. Compared to the conventional BP neural network and the standard LS-SVM, the simulation results show that the modified LS-SVM model can efficiently reflect the temperature response of the SOFC/MGT hybrid system. 相似文献
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针对传统的求解Jensen 模型敏感指数的回归分析法(LR)存在的有偏估计和拟合精度不高等问题,利用粒子群算法(PSO)和单纯形法—粒子群算法(SM-PSO)分别对模型的敏感指数进行求解并与传统方法进行对比。结果表明,回归分析法、PSO算法和SM-PSO算法所得模型计算的相对产量与实际相对产量的平均相对误差分别为3.1%、1.8%和1.4%,说明PSO算法和SM-PSO算法均优于传统算法,尤其是SM-PSO算法收敛速度更快、拟合精度更高,是一种有效的求解Jensen 模型敏感指数的方法。 相似文献
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An economic model and optimization procedure is developed in this paper for grid-connected hybrid wind–hydrogen combined heat and power systems for residential applications in northeastern Iran. The model considers various significant factors: energy production cost, electrical trade with local grid, electrical power generation from the wind/hydrogen energy system, thermal recovery from the fuel cell, and maintenance. Also, various tariffs for purchasing and selling electrical energy from the local grid are considered for the hybrid system operation. The optimization objective is to minimize the system total cost subject to relevant constraints for residential applications. To achieve this aim, an efficient optimization method is proposed based on particle swarm optimization. The proposed algorithm performance is compared with that for the imperialist competition algorithm. The results show that the hybrid system is the most cost-effective for the residential load, and the results of the proposed algorithm are more promising than those for the alternative algorithm. 相似文献
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为提高汽轮机转子故障诊断的准确率和识别效率,提出基于云粒子群优化算法(CPSO)优化支持向量机(SVM)的故障诊断方法。首先利用补充总体平均经验模态分解(CEEMD)对转子振动信号进行分解,利用能量法筛选出更为有效的固有模态分量(IMF)并计算对应的排列熵(PE)作为故障特征值;其次将云理论引入到粒子群优化算法(PSO)中得到CPSO算法,通过CPSO算法优化SVM得到诊断模型。在ZT-3试验台对汽轮机转子常见4种故障(正常状态、转子不平衡、转子不对中和动静碰磨状态)状态进行模拟实验,获取故障数据后进行故障识别研究。研究表明:在相同测试样本的条件下,CPSO-SVM诊断模型的识别准确率为95%,比PSO-SVM诊断模型提高了5%,运行时间为22.055 s,比PSO缩短了14.5 s。研究结果验证了CPSO-SVM算法在汽轮机转子故障诊断方面的优越性。 相似文献