共查询到17条相似文献,搜索用时 234 毫秒
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利用模糊逻辑系统,设计了用于控制电力系统暂态稳定性的静止无功补偿器(SVC)模糊自适应控制器。该控制器采用反向传播学习算法自动调节控制规则,并通过辨识器部分获取数据修改控制器参数。通过一个两机系统的计算机仿真,证明该SVC模糊控制器能有效地控制系统的暂态稳定性。 相似文献
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本文提出了一种基于专家的模糊逻辑电力系统稳定器,这种稳定器熔合了比例、模糊和比例积分三种控制策略、通过专家决策实现变结构控制,使电力系统稳定器既具有模糊控制简单和有效的非线性控制作用,又具比例和积分控制的快速性和跟踪能力,仿真计算结果表明这各于一般的模糊逻辑稳定器。 相似文献
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窦春霞 《自动化与信息工程》1999,20(4):26-29
为了抑制电力系统因负阻尼而产生的低频振荡,提高电力系统稳定性,设计了一种组合电力系统自适应稳定器GPSS(以下简称自适应稳定器GPSS)。理论分析和仿真结果都表明该方案对抑制电力系统低频振荡有显著效果。能提高电网运行质量,保障电网供电的可靠性和优质性。 相似文献
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在我国采用电功率信号作为输入量设计的纯算法电力系统稳定器技术日趋成熟,但纯算法构成组合型电力系统稳定器方面的有关技术未见报道.本文对纯算法组合型的电力系统稳定器进行了分析,并结合实际系统中的应用进行了仿真计算,在湖北清江隔河岩电厂对此类型的电力系统稳定器进行了现场试验,验证了其设计原理的正确性和实用性,为进一步开发,推广应用此类型的电力系统稳定器提供参考. 相似文献
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WANG Yun-jing 《数字社区&智能家居》2008,(35)
针对传统电力系统稳定器(PSS)的缺点,提出一种基于复合控制的电力系统稳定器,可以根据实际的运行情况在模糊和比例积分微分(Fuzzy-PID)控制中进行选择性的控制,使电力系统稳定器既具有模糊控制简单有效的非线性控制作用,又具有比例和积分控制的快速性和跟踪能力。理论分析及仿真结果均表明所提出的方案正确可行并具有良好的性能。 相似文献
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Murat Caner Nurettin Umurkan Sezai Tokat Seydi Vakkas Üstün 《Expert systems with applications》2008,34(4):2650-2655
This paper represents an artificial neural network (ANN) backpropagation algorithm is used to choose best coefficients of hierarchical fuzzy power system stabilizer (HFPSS). PSS is used for stability enhancement of a single machine infinite bus (SMIB) power system. ANN algorithm is used to predict load condition of the power system. And according to the predicted load condition ANN determinates choosing optimal parameters of the hierarchical fuzzy controller (HFC) to achieve better performance. Simulation results are compared with conventional PSS (CPSS) to show the effectiveness of the proposed controller. Also quantitative criterias of measuring performance is computed for 16 loading conditions. 相似文献
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This paper aims to propose a stable fuzzy wavelet neural-based adaptive power system stabilizer (SFWNAPSS) for stabilizing the inter-area oscillations in multi-machine power systems. In the proposed approach, a self-recurrent Wavelet Neural Network (SRWNN) is applied with the aim of constructing a self-recurrent consequent part for each fuzzy rule of a Takagi-Sugeno-Kang (TSK) fuzzy model. All parameters of the consequent parts are updated online based on Direct Adaptive Control Theory (DACT) and employing a back-propagation-based approach. The stabilizer initialization is performed using an approach based on genetic algorithm (GA). A Lyapunov-based adaptive learning rates (LALRs) algorithm is also proposed in order to speed up the stabilization rate, as well as to guarantee the convergence of the proposed stabilizer. Therefore, due to having a stable powerful adaptation law, there is no requirement to use any identification process. Kundur's four-machine two-area benchmark power system and six-machine three-area power system are used with the aim of assessing the effectiveness of the proposed stabilizer. The results are promising and show that the inter-area oscillations are successfully damped by the SFWNAPSS. Furthermore, the superiority of the proposed stabilizer is demonstrated over the IEEE standard multi-band power system stabilizer (MB-PSS), and the conventional PSS. 相似文献
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Emira Nechadi Mohamed Naguib Harmas Najib Essounbouli Abdelaziz Hamzaoui 《国际自动化与计算杂志》2013,10(4):281-287
Power system stability is enhanced through a novel stabilizer developed around an adaptive fuzzy sliding mode approach which applies the Nussbaum gain to a nonlinear model of a single-machine infinite-bus (SMIB) and multi-machine power system stabilizer subjected to a three phase fault. The Nussbaum gain is used to avoid the positive sign constraint and the problem of controllability of the system. A comparative simulation study is presented to evaluate the achieved performance. 相似文献
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在电力市场下的短期负荷预测问题中,考虑到天气和其它影响因素,将模糊系统与神经网络在负荷预测系统中按串联方式连接组成模糊神经网络(FNN),进行短期负荷预测。在负荷预测过程中,首先对负荷、天气、日期等数据进行模糊化处理,然后采用两种典型有效的改进BP算法对神经网络进行训练,并比较其速度与精度等。最后用训练好的网络进行预测,将预测结果与实际数据进行比较,证明其具有较好的预测效果。 相似文献
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多变量模糊控制的现状与发展(Ⅰ):关于分层,自学习,自适应等问题 总被引:18,自引:3,他引:15
回顾了多变量模糊控制近年来的发展过程,着重介绍近年来出现的一些新研究方向,并对当前该研究领域的热点课题:模糊模型的辨识、多变量模糊自校正控制、模糊解耦、模糊分层控制、模糊神经网络的研究现状以及它们的发展趋势作了进一步讨论。 相似文献