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研究了应用于电铁的单相有源电力滤波器,并分析了影响其性能的两个关键环节:谐波电流检测和补偿电流控制.用基于自适应原理的检测法检测出待补偿电流的指令值,并采用三角波调制电流控制方法,使逆变器产生出待补偿电流,来抵消因电铁牵引负荷的使用给电力系统带来的谐波影响.同时在MATLAB/SIMULINK的仿真软件下,建立了电铁牵引系统利用此滤波器进行谐波抑制的仿真模型,验证了方案的正确性和可行性. 相似文献
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文章提出了一种基于瞬时无功理论的谐波电流检测新方法,该方法采用滑动窗式平均滤波来替代传统的低通滤波器,减小了谐波电流检测中的延时问题。同时采用滞环控制来提高电流的响应速度。利用Matlab/Simulink软件中对所提策略进行了仿真研究,仿真结果证明了所提策略的有效性,电流补偿效果较好,在负载突变情况下,仍具有较快的响应速度。 相似文献
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传统的变压器谐波抑制主要采用改变变压器自身绕组接法或者设置谐波滤波装置的方法,这些方法能对谐波抑制起到一定的效果,但是其缺点也是比较明显。本文研究的变压器谐波及直流分量抑制装置需要它能对谐波电流等进行准确实时补偿,并克服传统的谐波抑制的缺点。其控制策略采用了基于瞬时无功功率理论的ip-iq检测法计算指令电流,并采用电流滞环比较控制方法产生补偿电流。文中给出了仿真实验的结果,验证了本文采用方法的正确性,并且达到了较好的补偿效果,有效地提高了电能质量和变压器的安全性。 相似文献
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本文的电力无源补偿滤波器的仿真系统将采用模糊控制系统做为电力无源补偿滤波器的主控制器并通过MATLAB/SIMLUNK仿真软件对滤波器的各环节进行了建模和仿真,仿真结果验证了无源滤波器能够随电容值和电感值的变化来消除系统中的谐波。 相似文献
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针对电气化铁道的谐波与功率因数问题,提出了采用ip-iq谐波电流检测算法和滞环跟踪比较控制环节的并联有源电力数字滤波器,并对设计结果进行了仿真分析,验证了此方法的可靠性与实用性,具有良好的应用前景. 相似文献
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本次研究通过基于盾构设备对供应系统,所造成较大无功冲击密切存在比较严重的谐波污染情况下,通过设计了盾构机供电系统无功补偿设备SVG,联合固定电容器组FC的混合性补偿方案,分析了此种优化方案的装置原理、具体控制方式及补偿容量。此种无功补偿优化方案在具备无功补偿同时,还实现了谐波治理。通过将其应用于MATLAB仿真系统,实证结果发现SVG联合FC组合优化补偿可行。 相似文献
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提高电能质量的方法有很多,有源电力滤波器(APF)由于能够对谐波和无功电流进行快速、准确地补偿而被公认为消除电网污染、提高电能质量的有效方法。本文根据主电路拓扑结构,对相应的参数进行了计算,并结合MATLAB仿真软件对各参数进行了优化选择,最后根据文中的各个参数利用MATLAB仿真软件对APF进行了仿真。仿真结果表明,APF很好地实现了对负载输入电流的控制。 相似文献
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Zhixiong Zhong Yanzheng Zhu Chih-Min Lin Tao Huang 《Journal of The Franklin Institute》2021,358(1):74-88
This article focuses on time delay switch (TDS) attacks on power networks subject to highly nonlinear and interconnection. T–S model is utilized to represent each nonlinear power subsystem in the network. In order to attenuate adverse impacts from TDS attacks, a novel control technique of estimation and compensation is proposed. Combined with the method of finite time boundedness (FTB), transient stability of power systems could be achieved. First, an augmented fuzzy observer is constructed to capacitate a synchronous estimation for system states and TDS attacks, which ensures that the estimation error is limited via the intersection operation of ellipsoids within a specified finite time interval. Then, a compensation technique is employed to attenuate the influence from TDS attacks. Finally, simulation results of a distributed power network show the efficacy of the proposed method against TDS attacks. 相似文献
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《Journal of The Franklin Institute》2022,359(18):10483-10509
In this paper, a fast fixed-time vertical plane motion controller is proposed for autonomous underwater gliders (AUGs) gliding in shallow water. The influence of speed-sensorless conditions, model uncertainties, unknown time-varying external disturbances, input saturations, and state delay are taken into account. To improve control performance, a fast fixed-time stable system is first presented. Based on the system, an adaptive extended state observer (ESO) is developed for estimating speed, model uncertainties, and external disturbances. A fast fixed-time controller is designed for improving the gliding efficiency and reducing the risk of hitting the ocean floor. Moreover, an input saturation auxiliary system and an advance compensation method are presented to cope with input saturations and state delay. According to Lyapunov theory, it is proved that the AUG states can converge into a small neighborhood within a fixed time. Finally, simulation results demonstrate the rapidity and effectiveness of the designed control method. 相似文献
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为解决PPP项目中政府对私营企业的补偿最优问题,引入PPP项目实物期权并利用实物延迟期权定价模型,研究了政府如何通过补偿来激励私营企业放弃延迟期权并进行立即投资;然后,讨论了投资补贴、收入补贴以及需求保证三种补偿方式来弥补企业的延迟期权;最后,通过算例分析比较了三种补偿方式对政府现金流的影响,为政府补偿的方案提供参考。 相似文献
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以民航业为例,通过建立评价指标,运用模糊综合评价法对如何评价服务补救质量进行了量化,并具体指出了各个指标对于航班延误服务补救质量的重要性程度,可以有效地指导航空公司提升航班延误后的服务补救质量,并为企业测评其服务补救质量提供借鉴和参考. 相似文献
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无功补偿在电力系统中起到提高功率因数的作用,合理地使用无功补偿设备,可降低设备和线路的损耗,对调整电网电压,提高供电质量,抑制谐波干扰,保证电网安全稳定的运行具有十分重要的作用。本文从电力无功补偿的基本原理、无功不足的危害、补偿方式、运行管理及实际应用几个方面进行分析,阐述了无功补偿在电力电网中应用的意义和作用。 相似文献
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《Journal of The Franklin Institute》2022,359(18):10355-10391
In this paper, an adaptive neural finite-time tracking control is studied for a category of stochastic nonlinearly parameterized systems with multiple unknown control directions, time-varying input delay, and time-varying state delay. To this end, a novel criterion of semi-globally finite-time stability in probability (SGFSP) is proposed, in the sense of Lyapunov, for stochastic nonlinear systems with multiple unknown control directions. Secondly, a novel auxiliary system with finite-time convergence is presented to cope with the time-varying input delay, the appropriate Lyapunov Krasovskii functionals are utilized to compensate for the time-varying state delay, Nussbaum functions are exploited to identify multiple unknown control directions, and the neural networks (NNs) are applied to approximate the unknown functions of nonlinear parameters. Thirdly, the fraction dynamic surface control (FDSC) technique is embedded in the process of designing the controller, which not only the “explosion of complexity” problems are successfully avoided in traditional backstepping methods but also the command filter convergence can be obtained within a finite time to lead greatly improved for the response speed of command filter. Meanwhile, the error compensation mechanism is established to eliminate the errors of the command filter. Then, based on the proposed novel criterion, all closed-loop signals of the considered systems are SGPFS under the designed controller, and the tracking error can drive to a small neighborhood of the origin in a finite time. In the end, three simulation examples are applied to demonstrate the validity of the control method. 相似文献
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研究了节点带有时滞且节点之间的通信也带有时滞的复杂动态网络的自适应同步问题。基于稳定性理论,设计了复杂网络同步的自适应控制器。该控制器结构简单,易于应用。最后,以环状耦合的时滞Lorenz系统为例进行数值仿真,检验了结果的正确性和设计方法的有效性。 相似文献
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相空间重构参数选择方法的研究 总被引：2，自引：0，他引：2
基于目前相空间重构中常用的参数选择方法,提出了一种新的相空间重构的联合算法,联合算法以时间窗口法和互信息法为基础,在综合考虑嵌入窗宽的基础上,可同时确定嵌入延迟和嵌入维数.仿真实验表明,用该算法计算Lorenz混沌时间序列关联维相对误差由传统算法的0.83%降低到0.44%,有效地提高了计算相空间重构中不变量的精度. 相似文献