一种新型混合型有源电力滤波器的研究

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.     

混合滤波系统中无源电力滤波器的优化设计

混合型有源滤波器能否按其工作原理实现预期的谐波抑制效果,在很大程度上还有赖于无源滤波器的优化设计。文章首先介绍了由小容量有源滤波器和无源滤波器串联构成的混合电力滤波系统,继而建立了其无源部分的优化模型,采用改进的遗传算法对系统的投资成本、无功补偿和滤波效果三个方面进行了优化设计研究。为克服算法的早熟收敛现象,引入了混沌算子来增加种群的多样性。工程算例的仿真计算验证了该方法的正确性和可行性,且综合性能较好,C程应用价值较高。     

混合型APF与HPF并联运行的方案探讨

在对几种不同拓扑结构的混合型有源滤波器进行对比分析的基础上,提出了一种改进方案,通过降低有源装置承担的基波电压和减小有源装置输出的基波电流有效降低了有源装置的容量。采用混合型有源滤波器与高通无源滤波器并联运行的方式,克服了原有装置补偿无功不足、有源部分容量大、成本高的缺点。方案运用了谐波分次检测、电容组投切、组合检测方式、谐波电流反馈校正等手段改善系统性能。通过理论分析,论证了该方案的有效性、可行性。     

混合注入式有源电力滤波器的原理和结构分析

针对目前无源滤波器的缺点,采用一种适应高压大容量环境、兼顾谐波治理和无功补偿、投资成本较小的新型APF混合方案--大功率并联混合注入式有源电力滤波器HSHIAPF(High-capacity shunt Hybrid Injection Type Active power Filter),并着重研究HSHIAPF的结构与原理。     

三相整流桥直流侧和交流侧并联型有源电力滤波器比较研究

三相直流侧和交流侧有源电力滤波器均可用于三相不可控整流桥的谐波治理。从谐波补偿效果、有源滤波器的补偿容量、开关应力三个方面对二者进行了分析和对比。分析结果表明,由于直流侧有源电力滤波器并联在整流桥的直流侧,在换相处的负载电流变化率比交流侧小得多,因此直流侧有源电力滤波器的补偿性能优于交流侧有源电力滤波器。同时由于直流侧有源电力滤波器工作在电压电流两个象限,因此其补偿容量和开关应力远小于交流侧有源电力滤波器。     

混合有源电力滤波器分析及应用探讨

有源电力滤波器由于有很好的滤波特性：动态特性好、体积小等优势一直得到广泛关注，但其缺点又限制了其实际应用。将有源电力滤波器与无源电力滤波器相结合，构成混合有源滤波器（AF），取两者之长补有源电力滤波器（APF）之短，可以降低谐波补偿系统的成本，达到APF实用的目的。本文对几种主要的混合APF（HA PF）作了分析和比较。     

三相电路有源滤波器的试验研究

在电网运行过程中,谐波与无功由于大量非线性负荷的使用以及单机容量的不断增加而相应产生。就谐波而言会导致电网谐波污染的产生。对此,有源电力滤波器是治理电网谐波、无功污染、改善电能质量的最有效手段,现今已成为电力电子技术应用的一个重要研究热点。本文就三相电路有源滤波器的试验研究做了一些分析及论述,提出了一些想法与见解。     

混合有源电力滤波器的仿真研究

分析混合有源电力滤波器的补偿原理和补偿特性,该滤波器能够很好地改善无源滤波器的滤波性能,实现大功率下的谐波抑制和无功功率补偿。最后,建立仿真模型,并对波形作出分析。     

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

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。     

混合有源电力滤波器的仿真研究

分析混合有源电力滤波器的补偿原理和补偿特性,该滤波器能够很好地改善无源滤波器的滤波性能,实现大功率下的谐波抑制和无功功率补偿.最后,建立仿真模型,并对波形作出分析.     

高输入功率因数的三相无源AC-DC变换器

对于采用三相不控整流桥作为前级的变换器，自然条件下其输入电流波形系数不高，使得输入功率因数委低，降低了电源的利用率。为此需要采用功率因数提高技术，其中无源PFC是一类重要的功率因数校正技术，在某些场合非常具有应用价值。本文介绍了几种三相无源AC-DC变换器的高功率因数方案，如采用LC滤波器、移相电抗器，谐振电抗器，移相变压器，相间变压器，相间电抗器等，在进行简单的工作原理描述后，给出了部分方案的MATLAB/SIMULINK仿真结果。     

一种双频微波功率合成器的设计与实现

一种新型的双频微波功率合成器，通过阶跃阻抗低通滤波器和平行耦合线带通滤波器构成的微带电路实现。该微波功率合成器实现了915MHz和2．5GHz两个非相干频率微波信号的功率合成。同时通过附加工作在915MHz和2．5GHz的20dB微带定向耦合器，就可以构建实验系统进行微波功率合成的测量。实验测量结果与数值模拟结果吻合，双频微波功率合成器和定向耦合器的性能达到了要求，可用于注入式微波器件效应的研究。     

Issues in the Delivery of RF Current Pulses to a Microprocessor

Passive and active filters are reviewed to define technology requirements for maintaining the impedance seen by the microprocessor below 1mOmega (100mV transient excursion on top of a 0.8-V, 120-A bus) in the gigahertz frequency range. The designs of these filters need to be coordinated so that the active filter does not have to carry the bulk of the real power or a significant amount of reactive power. Parasitic inductances need to be kept below a picohenry and amplifiers need to have bandwidth approaching a gigahertz to keep the loss below 10% of the real power     

Si IC-compatible inductors and LC passive filters

Passive inductors and LC filters fabricated in standard Si IC technology are demonstrated. Q-factors from three to eight and inductors up to 10 nH in the gigahertz range have been realized. Measurements on a five-pole maximally flat low-pass filter give midband insertion loss and -3 dB bandwidth close to the nominal design values of 2.25 dB and 880 MHz     

Distributed Bragg reflector active optical filters

The characteristics of active optical filters based on distributed Bragg reflector (DBR) laser diodes are described. The authors present a theoretical model for the small and large signal filter response which can be used to optimize the filter design and operating point. The large signal filter response is dominated by a variety of nonlinear effects, including a wavelength domain bistability. The authors describe a series of experiments in which the predicted filter characteristics are demonstrated. The authors present detailed measurements of the filter transfer function in both transmission and reflection modes under low and high power injection. For the small signal measurements a powerful technique which uses the swept frequency concept is presented. For the large signal regime, measurements of both frequency pulling and wavelength domain bistability are presented     

Input filter design for power factor correction circuits

The issues involved in the design of power factor correction circuit input filters are significantly different from those involved in the design of input filters for DC-DC power converters. In many cases, the EMI and power factor requirements are impossible to meet using the existing filtering technology. This paper proposes the use of high-order elliptic filters to achieve the required EMI attenuation and power factor. The new input filter technology provides a significant filter size reduction over the standard filter designs, minimizes the filter-power converter interaction, and maintains a good converter power factor. New active and passive filter damping methods that guarantee optimal filter pole damping, while virtually eliminating damping resistor power dissipation, are proposed. The filter design procedure that makes possible a simple and fast design of filters with an arbitrary number of stages is also presented     

Design Considerations for Maintaining DC-Side Voltage of Hybrid Active Power Filter With Injection Circuit

Hybrid active power filter with injection circuit (IHAPF) shows great promise in reducing harmonics and improving power factor with a relatively low capacity active power filter, but suffers from dc-side voltage instability that inadvertently impacts the compensation performance and safety of the IHAPF. In this paper, two new methods are proposed to overcome this major technical challenge with a hysteretic control and energy release circuit, and a controllable pulsewidth modulation (PWM) rectifier. Modeling, theoretical analysis, and experimental results have verified that both methods can stabilize dc-side voltage within a certain range. A prototype IHAPF system was built incorporating the PWM rectifier dc voltage control scheme, and installed in a 220 kV substation in Southern China. It demonstrated significant improvement in harmonics reduction and power factor. The dc voltage stability issue was also resolved with the new design.      

用于谐波检测中的数字低通滤波器的设计

有源电力滤波器谐波检测中数字低通滤波器的设字低通滤波器的硬件实现方案,并按照层次化、模块化、参数化的设计思路,采用VHDL硬件描述语言进行了硬件设计,并进行了仿真验证,为有源电力滤波器谐波检测中低通滤波器设计提供了参考.     

一种C波段大功率谐波滤波器的设计

介绍了在大功率要求下一种C波段谐波滤波器的设计方法,采用漏壁式低通滤波方式,结构上分为主波导和副波导阵。该滤波器通带内电压驻波比小,插入损耗低。该设计使得滤波器耐功率高,可靠性好,可适用于多种大功率侦察设备。     

LCL滤波器在并联型有源电力滤波器中的设计

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。