共查询到17条相似文献,搜索用时 109 毫秒
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并联有源滤波器中滞环控制的设计研究 总被引:1,自引:0,他引:1
针对并联型有源电力滤波器产生的补偿电流应实时跟随其指令电流信号变化的要求,提出了一种基于滞环比较器的瞬时值比较方式,其电流控制采用跟踪型PWM控制方式。该方式应用于电压源型变流器为主电路结构的并联有源电力滤波器中,对三相四线制系统中非线性负载的谐波和无功电流有理想的补偿效果。着重给出了选取滞环宽度的理论分析和仿真模型,设计了一套三相四线制并联有源滤波器实验装置。仿真和实验结果证明了所选取控制方法的可行性和有效性。 相似文献
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Studied the harmonic control of the 6 kV power grid in a coal mine substation. Taking harmonic suppression and reactive power
compensation into account, and complying with the economic and efficient technical line of the smart grid, a new hybrid active
filter was proposed and applied to the power grid in the coal mine with the advantages such as large capacity, low cost and
low loss. In order to improve detection speed and reduce the succeeding errors to improve the filtering performance of the
active power filter, the DFT (Discrete Fourier Transform) sliding window algorithm based on coordinate transformation and
improved hysteresis control method was proposed. The Matlab simulation results show that the hybrid active filter is satisfactory,
can improve the grid power factor and can meet the requirements of improving the power quality in the coal mine. 相似文献
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针对谐波对煤矿井下电力系统产生严重扰动并且还耗费较多无功等问题,同时结合基于瞬时无功功率理论的谐波检测方法在三相四线制电路的应用局限性,采用可调Q因子小波变换改进瞬时无功功率理论对谐波总含量进行检测。运用MATLAB/SIMULINK创建三相四线制有源滤波器的仿真模型,将其使用到有源滤波器的谐波检测模块中,设置相应的仿真参数,根据仿真结果分析该有源滤波器的谐波抑制效果,很好的改善了煤矿电能质量。 相似文献
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以矿井直流提升机供电系统产生的谐波为研究对象,采用动态谐波检测和抑制方法,对电网进行了谐波治理与无功补偿.运行MATLAB软件仿真了其谐波特性,并进行谐波动态检测和抑制仿真,仿真结果表明:该方法可以实时检测提升机供电系统中的谐波,并可对谐波进行有效抑制,经过该有源滤波器处理后,提升机系统谐波总畸变率降至1%左右,功率因数接近为1. 相似文献
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基于滑模控制原理,针对矿用谐振阻抗型混合有源滤波系统(RITHAPF)控制技术进行深入研究,并对电网进行无功补偿和谐波抑制。利用开关函数建模法进行系统建模,给出RITHAPF的数学模型。通过对RITHAPF的等效模型的分析推导,提出了RITHAPF系统的收敛和稳定判据。结合离散指数趋近律对离散滑模控制的影响,将连续系统的指数趋近律方法推广到离散系统,证明离散指数趋近律滑模控制对系统摄动和外界干扰依然具有鲁棒性。进一步根据有源电力滤波器的离散数学模型,设计滑模离散数学模型。基于趋近律离散滑模变结构控制设计有源部分的电流跟踪控制器。结果表明,采用滑模控制的谐振阻抗型混合有源滤波器对矿用直流提升系统6 kV母线的无功功率和谐波电流补偿效果良好。 相似文献
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针对近年来煤矿提升、通风以及运输设备中广泛使用变频器、整流器等电力电子装置所产生的大量谐波问题,提出一种性能优越、实用前景很强且较为先进的单周控制四相补偿APF。把单周控制原理与APF理论相结合,从而推导出该APF控制方程,并设计出相应的单周控制器,最后对此APF在煤矿电网进行了仿真研究。 相似文献
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Because of the widely-used nonlinear loads, the problems of harmonics and low power factor in power systems are becoming more
and more serious. In view of the above problems, a shunt three-phase active power filter (SAPF) based on discrete sliding
mode control to suppress the harmonics was designed and the power factor improved. First, built the mathematical model of
SAPF. Then, controlled the switch through analyzing the harmonic current that was controlled signal using discrete sliding
mode control. Through simulation using MATLAB, verified the validity of the algorithm. By the simulation waveforms, it can
be found that after the load current containing a large number of harmonics passes the active power filter, the waveform of
the power current approximately becomes a sine wave and the harmonics is significantly reduced. As a result, it plays a good
role in purifying power systems. Moreover, from the waveforms of harmonic current and power current, it can be found that
the algorithm has a faster tracking speed. The waveform can be stably tracked in the half cycle and real-time if the algorithm
is perfect. 相似文献