共查询到18条相似文献,搜索用时 218 毫秒
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介绍了单周控制有源滤波器的原理,针对经典单周控制有源滤波器存在的诸如电流直流分量问题、局部稳定问题等,提出了单周控制有源滤波器的互补控制策略、电流直流分量负反馈策略和两路信号差值积分负反馈策略。新控制策略的采用彻底克服了经典单周控制有源滤波器的电流直流分量问题,实现了单周控制有源滤波器的全局稳定,并消除了电流交越失真,使得具有诸如无须参考信号、检测量少、控制简便、波形质量高、动态跟踪性能好、抗干扰能力强等显著优点的单周控制有源滤波技术达到实用化程度。实验结果证实了所述控制策略的有效性。 相似文献
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单周控制有源滤波器的技术分析 总被引:1,自引:0,他引:1
单周控制有源滤波器具有结构简单、控制精度高、响应速度快等优点。从有源滤波器统一单周控制方程出发,对目前各种类型的单周控制有源滤波器进行了综述,对不同方案的工作原理、控制方法和控制特点进行了研究,并对单周控制有源滤波器未来的发展作出了展望。 相似文献
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单周控制有源电力滤波器由于不需要检测电源电压和负载电流,不需要使用乘法器,因而降低了成本,简化了电路结构。近年来,基于单周控制的单相、三相有源电力滤波器已受到广泛关注,在传统控制方法的基础上,很多改进控制方法能够更好地提高其补偿性能。介绍了单周控制在单相、三相有源电力滤波器中应用的各种拓扑和控制策略,并对它们的优缺点及应用场合进行了比较。 相似文献
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单周控制在有源电力滤波器不同拓扑中的应用比较 总被引:2,自引:0,他引:2
单周控制有源电力滤波器由于不需要检测电源电压和负载电流,不需要使用乘法器,因而降低了成本,简化了电路结构.近年来,基于单周控制的单相、三相有源电力滤波器已受到广泛关注,在传统控制方法的基础上,很多改进控制方法能够更好地提高其补偿性能.介绍了单周控制在单相、三相有源电力滤波器中应用的各种拓扑和控制策略,并对它们的优缺点沣及应用场合进行了比较. 相似文献
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对应用于补偿电铁谐波的有源电力滤波器的性能进行了分析,并讨论了其工作原理。采用基于鉴相原理的检测法检测出待补偿电流的指令值,并利用单周控制的双向互补控制策略,使逆变器产生出补偿电流,来抵消电铁谐波源对电力系统带来的不利影响。同时在MATLAB/SIMULINK的仿真软件下,建立了电铁牵引供电系统,利用有源电力滤波器进行谐波抑制的仿真,仿真结果验证了该方案的正确性和可行性。 相似文献
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为《自动控制原理实验》设计的实验台。可利用灵活多变的开关硬件系统,实现模拟电路典型控制环节实验;还可利用丰富的软件资源,实现计算机软件典型控制环节。并且软件控制算法为独立的模块可以编写不同的控制算法来实现控制。实验结果表明:该液位控制系统实验台可以实现硬件和软件独立控制液位,满足更高层次教学和科研要求。 相似文献
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The buck–boost converter is controlled using different algorithms like voltage mode control, current mode control, V2 control, enhanced V2 control, Sliding Mode Control (SMC), and Proportional Integral (PI) control. In all these algorithms the steady state error is more. On combining PI control and sliding mode control the steady error can be minimized. In industry and commercial applications involving Photo-Voltaic (PV) systems, uses buck–boost converter. In this converter above control algorithms are implemented using hardware circuitry or microcontroller. In industry and commercial applications Digital Signal Processor (DSP) is used for automation purposes and the same DSP can be used to implement control algorithms so as to get maximum electrical energy from solar energy. The efficient utilization of resources such as DSP is achieved as we are using the same DSP for implementing control algorithm. In the proposed study, PI control method and sliding mode control methods are combined to obtain a Proportional Integral Sliding Mode Control (PISMC) and it is used to control the buck–boost converter which is used to drive the electrical loads from solar energy. The buck–boost converter is designed, simulated and implemented. The algorithms PI, SMC and PISMC are simulated in using MATLAB simulink and then implemented in DSP TMS 320 2808. In the proposed study PISMC, a stable and efficient output voltage is obtained in which the steady state error and maximum overshoot are minimum. The PISMC is better in terms of transient and steady state performances as validated by our experiments. The proposed study will work in real-time since DSP is used for implementing the control algorithms and found to be better in terms of speed and regulation. The proposed DSP based PISMC can also be used to control other types of DC–DC converters. 相似文献
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负荷开关批量控制技术可实现批量控制负荷序列的维护管理、智能选线、快速并发控制及操作统计等功能,利用现有的遥控点表信息及数据传输通道实现对变电站断路器远方操作控制,并向省调系统传送实时可切负荷及控制结果数据。在电网稳定运行中变电站施行无人值班和强直弱交大受端电网严重故障时,负荷开关批量控制技术可以通过并行的方式批量控制电网负荷,并提供控制过程的可视化和交互操作,大大缩短故障处理时间。负荷开关批量控制技术对提升电网重、特大事故快速反应能力和保障电网稳定运行具有良好的实用意义。 相似文献
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In this paper, a positioning control of a nonlinear elastically coupled two-mass system is presented. Structures of two-mass systems can often be found, e.g., in robotics or machine tools. The contained mechanical parts, like gears and shafts, can lead to limit cycles and stick-slip effects. In order to avoid the unwanted effects an H/sub /spl infin// control design is used for the system. Parameter uncertainties and elastic torsion are also taken into account in the control synthesis. If the measurability is limited, so that only the system output can be measured, a nonlinear observer is used. The standard output-feedback H/sub /spl infin// control structure needs some basic changes for this nonlinear observer. The result is an H/sub /spl infin// control, which can handle the nonlinear system, even if only the system output can be measured. The control shows good dynamics, robustness, and can handle disturbances. Measured results are shown in this paper. 相似文献
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X. -P. Zhang 《Electrical Engineering (Archiv fur Elektrotechnik)》2006,88(4):247-257
In this paper, three models of the unified power flow controller (UPFC) suitable for three-phase power flow analysis in polar coordinates are presented. The symmetrical components control model can be used to control the positive-sequence voltage of the shunt bus and the total three-phase active and reactive power flows of the transmission line while the injected shunt voltages and the series voltages are balanced, respectively; the general three-phase control model can be used to control the three shunt phase voltages and the six independent active and reactive power flows of the transmission line; the hybrid control model can be used to control the positive-sequence voltage of the shunt bus and the six independent active and reactive power flows of the transmission line. The proposed UPFC models were successfully implemented in a three-phase Newton power flow algorithm in polar coordinates. In the implementation of these UPFC models, transformers of some common connection types, which connect the UPFC with the network, are explicitly represented. Numerical results based on a five-bus system and the modified IEEE 118-bus system are given to illustrate the UPFC control models and demonstrate the computational performance of the three-phase Newton power flow algorithm. 相似文献
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为了实现微电网不同运行模式间的无缝切换,文中提出了一种计及储能系统并网逆变器的混合型控制算法。针对逆变器的分层控制结构的特点,该算法融合了三类控制:二自由度控制原理、电流预测控制模型以及改进下垂控制相,将三种控制应用于逆变器的不同层。其中,控制层电流内环采用电流预测模型控制器替代PI控制器、PWM调节器;控制层电压外环则利用二自由度控制原理,构造被控对象逆模型,并在电流内环电流预测模型控制的基础上,单位化控制层传函,消除有害扰动量对储能控制系统的影响。应用层则采用以电压、频率为反馈量的改进下垂控制,实现孤岛微电网电压与频率的无差调节。并且此时储能系统控制层可作为微电网并/孤网运行时的共享层,因此在微电网运行模式切换过程中,其暂态冲击电流及母线电压畸变率也得到明显抑制。最后通过MATLAB/Simulink仿真系统,验证所提混合型控制算法的正确性与有效性。 相似文献