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有源电力滤波器的研究热点和发展 总被引:1,自引:0,他引:1
有源电力滤波器研究已成为目前国内外供电系统谐波抑制研究的热点。本文首先介绍了两种谐波治理的措施。然后重点对有源电力滤波器研究中的拓扑结构、检测和控制理论、数字化控制技术发展等研究热点进行介绍和分析。最后指出了有源电力滤波器今后发展的一些主要方向。[编者按] 相似文献
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提出了一种单相并联混合型有源电力滤波器的电路结构.该电路由有源滤波器与基波串联谐振支路并联再与无源滤波电路串联构成,用于抑制非线性整流负载产生的谐波电流流入电源侧.在该电路中,无源滤波器分担大部分抑制谐波和无功补偿的任务,减少了有源滤波器的容量;有源电力滤波器用于改善无源滤波器的滤波效果,抑制它与系统阻抗可能发生的谐振.实验结果表明,该混合型有源滤波器充分发挥了无源滤波器和有源滤波器各自优点,改善了无源滤波器的滤波性能,同时使有源滤波器不再承受基波电压,最大限度地减少了有源滤波器的容量,从而使有源电力滤波器可应用于大功率场合. 相似文献
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LCL滤波器在并联型有源电力滤波器中的设计 总被引:1,自引:0,他引:1
在满足相同的高频滤波效果的情况下,LCL滤波器所需的总电感值比L滤波器小,因此更适于在大功率、开关频率较低的电流源控制型并网设备上应用。然而针对该类型滤波器的参数设计不仅关系到开关频率处纹波抑制效果,同时也会影响电流控制器的性能。随着高频谐波抑制效果明显的LCL滤波器在并联型有源滤波器中应用,基于谐波电流跟踪控制器的LCL参数设计需要进一步研究,因此文中基于并联型有源电力滤波器给出一套LCL滤波器设计方法,并通过仿真验证该LCL滤波器的有源电力滤波器的有效性。 相似文献
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针对谐波抑制和无功补偿的问题,对有源电力滤波器进行一系列研究,阐述了有源电力滤波器的基本原理以及控制策略。基于TMS320LF2812设计了有源电力滤波器,包括DSP控制板、电压采样电路,电流采样电路以及IPM功率单元的设计,并给出了有源电力滤波器的软件设计。最后利用MATLAB仿真软件对所涉及的有源电力滤波器进行仿真,验证了有源滤波器系统的正确性以及谐波补偿电流和滞环比较控制模块的有效性。 相似文献
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开关电源在雷达电源系统中的广泛应用,使得电网中的电流谐波污染越来越严重.文中通过对雷达电源系统产生的电流谐波的危害分析,提出了采用谐波补偿技术抑制谐波电流的方法.介绍了无源和并联有源谐波滤波器的工作原理及特点,并给出了不同的谐波滤波器在雷达电源系统中的应用测试结果.实测结果表明,谐波滤波器对雷达电源系统产生的谐波电流都有明显的抑制作用. 相似文献
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提出了一种基于全模拟器件的有源电力滤波器的电路设计方法。该有源电力滤波器借用成熟的模拟电子技术构成,能达到实时的谐波抑制效果。文中给出了各部分电路设计及其说明,并对采用并联和串联型接入电网方式进行了研究和对比。 相似文献
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电力系统中非线性负载增加引起谐波容量增加,致使电能质量下降.本文针对这一现象,从谐波的实时检测方法和控制方法进行了探讨,并利用并联混合型有源电力滤波器对谐波进行实时检测和控制,同时与传统的谐波技术进行比较.仿真结果表明采用并联混合型有源电力滤波器补偿技术能有效地抑制谐波. 相似文献
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Tzung-Lin Lee Jian-Cheng Li Po-Tai Cheng 《Power Electronics, IEEE Transactions on》2009,24(5):1209-1217
Severe voltage distortion, due to power system harmonic resonance, has been reported in recent years. This issue becomes more significant in high penetration of a photovoltaic (PV) network. A conventional voltage detection active filter operates as similar conductance for all harmonic frequencies to resolve this problem whether in a fixed conductance command or in an automatic gain adjustment control. However, its filtering capability is impeded by the mismatch between the active filter and the radial line, and the voltage distortion may still be significant. This paper proposes a discrete frequency tuning active filter to suppress power system harmonics. The active filter operates as variable conductance for each individual harmonic frequency. Each harmonic conductance is dynamically adjusted according to the corresponding harmonic voltage distortion of the active filter installation point in response to increase or decrease of nonlinear loads, or variation of resonant frequency in the power system. The mismatching problem between the feeder impedance and the active filter can be avoided effectively. Therefore, harmonic voltage distortion can be maintained at an allowable level throughout the feeder with lower peak current and lower rms current of the active filter, and loads installed at various locations of the power system receive more uniform voltage waveform. 相似文献
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文章系统地分析了谐波对通信机房楼内设备、线路等造成的危害,以及谐波带来的有功损耗问题。在此基础上,研究了并联有源滤波器的工作原理,以及采用并联有源滤波器对通信电源系统进行谐波治理的方法。 相似文献
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This paper proposes a hybrid active filter for the damping of harmonic resonance in industrial power systems. The hybrid filter consists of a small-rated active filter and a 5th-tuned passive filter. The active filter is characterized by detecting the 5th-harmonic current flowing into the passive filter. It is controlled in such a way as to behave as a negative or positive resistor by adjusting a feedback gain from a negative to positive value, and vice versa. The negative resistor presented by the active filter cancels a positive resistor inherent in the passive filter, so that the hybrid filter acts as an ideal passive filter with infinite quality factor. This significantly improves damping the harmonic resonance, compared with the passive filter used alone. Moreover, the active filter acts as a positive resistor to prevent an excessive harmonic current from flowing into the passive filter. Experimental results obtained from a 20-kW laboratory model verify the viability and effectiveness of the hybrid active filter proposed in this paper 相似文献
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针对当前有源滤波器谐波检测算法的精度低、运算量大、实时性差等不足,为了获得更加理想的谐波检测结果,提出了基于最小均方和递归最小二乘的有源滤波器谐波检测算法。首先针对锁相环获取输入信号运算量大、谐波检测时间长的难题,将过负载电流作为参考输入,加快有源滤波器的响应速度,然后基于最小均方算法和递归最小二乘算法快速、准确的实现谐波检测,最后在MATLAB 1204平台对本文算法的有效性和先进性进行了仿真验证性实验。 实验结果表明,本文算法得到了较高的有源滤波器谐波检测精度,能够提高有源滤波器的补偿性能,而且具有较快的动态响应速度,改善了算法的实时性。 相似文献
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This paper presents a dominant harmonic active filter (DHAF) scheme using small-rated square-wave inverters for supply line harmonic current reduction for high-power nonlinear loads in the range of 10 MW and above to meet IEEE 519 harmonic standard. The active filter inverters are connected in series with the fifth and seventh L-C tuned filters, respectively. A synchronous reference frame-based controller which achieves harmonic isolation for the dominant fifth and seventh harmonic load currents in the presence of supply voltage harmonic distortion is presented. Impact of mistuned passive filters on the operation and rating of the square-wave active filter inverters is examined. Simulation results validate the proposed harmonic isolation controller under mistuned fifth and seventh L-C tuned filter conditions and supply voltage harmonic distortion. The proposed scheme is general and applicable for high-power 6- or 12-pulse rectifier loads. The use of small-rated square-wave inverters (approximately 2% of load kilovoltampere rating) increases the cost effectiveness of the DHAF system for high-power applications 相似文献
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谐波的实用抑制措施及滤波器的应用——工业与建筑物电气系统谐波问题之三 总被引:1,自引:0,他引:1
根据不同的谐波源的特点,介绍了不同的实用抑制措施,还不满足标准要求时,就得采用滤波器,针对现代出现多的不同于电流型的电压型谐波时,介绍了并联型(包括有源和无源)滤波器的限制条件(注意事项),有源和无源滤波器的并联可能性,滤波器在系统中的配置,对我同发展滤波器的建议,以及中性线上谐波抑制的特殊问题。 相似文献
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并联混合型有源电力滤波器的建模仿真 总被引:1,自引:1,他引:0
为了达到抑制谐波污染的目的,采用了并联混合型有源滤波器的方法,并在Matlab/Simulink平台针对并联混合型有源滤波器的各个组成部分建立了仿真模型,并对该APF进行了详尽的动态仿真。通过频谱图分析数据结果,说明了谐波得到有效的补偿,获得了比较满意的仿真效果,为并联混合型有源滤波器应用于实际提供了设计依据。 相似文献