电力有源滤波器在供电系统中的应用

电力有源滤波器在供电系统中的主要应用是补偿电网中的谐波和无功功率,依此改善交流电源的供电质量。文中介绍了电力有源滤波器的电路结构以及控制方式。给出了电压型电力有源滤波器,电流型电力有源滤波器,多模式电力有源滤波器以及混合型电力有源滤波器的电路结构,并重点介绍无功电流和谐波电流的检测,逆变器直流侧电源电压的控制以及混合型电力有源滤波器的控制方案,最后给出了电力有源滤波器的补偿特性。     

电力有源滤波器在供电系统中的应用（续）

电力有源滤波器在供电系统中的主要应用是补偿电网中的谐波和无功功率,依此改善交流电源的供电质量。文中介绍了电力有源滤波器的电路结构以及控制方式。给出了电压型电力有源滤波器、电流型电力有源滤波器、多模式电力有源滤波器以及混合型电力有源滤波器的电路结构,并重点介绍无功电流和谐波电流的检测、逆变器直流侧电源电压的控制以及混合型电力有源滤波器的控制方案,最后给出了电力有源滤波器的补偿特性。     

直流微网母线电压纹波集中补偿自寻优策略

为抑制直流微网母线电压二次纹波,文中提出了一种直流有源滤波器集中补偿自寻优策略。在双向DC/DC变换器电压/电流双闭环控制的基础上,加入直流母线电压纹波控制,通过引入带通滤波器消除了传统控制方法中采用低通滤波器提取纹波时所产生的相位滞后问题。采用迭代自寻优方法获取重要控制参数阻抗系数K,实现直流有源滤波器对直流母线电压纹波变化的实时跟踪和集中补偿。在MATLAB/Simulink中搭建了含互联接口变流器、分布式电源、直流负荷、由DC/AC变流器接入的交流负荷以及直流有源滤波器的直流微网模型,建立了相应的实验平台。仿真和实验结果均验证了所提控制策略的有效性。     

并联型有源电力滤波器直流侧电压柔性控制策略

针对并联型有源电力滤波器的直流侧电压控制特点,提出了一种对直流侧电压进行柔性控制的并联型有源电力滤波器控制策略。该策略中,在直流侧电压控制部分引入反馈低通滤波器,削弱直流侧固有谐波对输出电流控制的影响;在电流控制的输出部分通过增加直流侧电压前馈系数,抵制在变换桥中可能引入的直流侧电压谐波影响。仿真结果表明直流侧电压柔性控制策略能够降低APF系统补偿后的电源电流总谐波畸变率,从而改善并联型有源电力滤波器的谐波补偿性能。     

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。     

新型三相三线制并联有源滤波器的滑模控制方法

为了提高有源滤波器的谐波补偿效果,设计了一种新型滑模控制器,用于三相三线制并联有源滤波器的参考电流跟踪控制.谐波电流检测方法采用基于瞬时无功功率理论的谐波电流检测方法,能快速、准确的检测出负载电流中的谐波分量.直流侧电压控制方法采用PI控制方法实现.Simulink仿真结果显示,与传统的滞环比较控制方法相比,所设计的新型滑模控制方法能够有效的降低跟踪误差,提高有源滤波器的谐波补偿效果.     

基于磁通补偿原理的有源电力滤波器

根据电力电子系统的磁通补偿原理。介绍了一种基于磁通补偿原理和并联变压器谐波阻抗控制的有源电力滤波器的设计方案,给出了采用单位功率因数控制策略控制有源电力滤波器的基本结构和谐波电流检测方法。同时通过仿真实验,给出了对滤波器进行补偿的补偿电流和系统电流的波形。     

基于单周控制的电铁有源电力滤波器的研究

补偿电流的控制方法是实现有源电力滤波器功能的核心环节,本文采用单周控制的双向互补控制策略的单相有源电力滤波器能对电铁系统中的谐渡电流起到很好的补偿作用,并建立了以双向互补控制策略为补偿电流控制方法的仿真模型,仿真结果表明单用控制技术可以用于电铁供电系统的有源电力滤波器的电流控制中,并且还能有效地滤除电力机车中的绝大部分...     

通信电源技术：2006年第6期（总第102期）卷终 总目次

11月出版研制开发并联型有源电力滤波器的间接电流控制技术方昕，戴珂，耿攀，康勇(97．1)基于简单拓扑的单相交流降压变换器研究蔡鹏，谢少军(97．5)隔离式低压大电流输出DC／DC变换器拓扑分析樊建辉，罗乾超，何圣仲(97．9)大容量并联型有源电力滤波器的软启动技术耿攀，戴珂，方昕，张凯(97．12)单周期控制有源电力滤波器直流分量抑制新方法钟龙翔，梁冠安，余凤兵(97．16)基于双环控制的PWM逆变器的研究陈瑞，周梁，韦忠朝(97．19)PWM开关变换器的建模方法综述陈果，谢运祥(97．22)基于MATLAB的数字滤波器分析程明，李裕能，王翔…     

级联型有源电力滤波器的研究

把级联型变流器应用于有源滤波装置是实现大容量谐波补偿的重要途径。介绍级联型有源电力滤波器的基本原理,针对级联型拓扑结构基于瞬时无功功率理论改进了指令电流的计算,使其三相直流侧电压独立控制,满足有源电力滤波器运时对直流侧电压稳定性的要求。用载波相移—正弦脉宽调制(CPS-SPWM)实现电流跟踪控制,并对CPS-SPWM进行了数学分析,同时为了降低启动过程中直流侧电压和电流的过冲,设计一种直流侧预充电方案。最后通过仿真软件MATLAB/Simulink进行仿真验证设计可行性。     

基于DSP单周控制有源电力滤波器的研究

针对有源电力滤波器中畸变电流检测的快速实时响应问题,研究有源电力滤波器的单周控制原理与控制策略,提出单相并联型有源电力滤波器的单周控制模型。并在以DSP为核心控制器的基础上,设计单周控制有源电力滤波器,对其进行了实验研究,对试验的结果进行了分析。实验结果表明,该法实时性好、控制电路结构简单、动态特性好。     

Unified constant-frequency integration control of active powerfilters-steady-state and dynamics

An active power filter (APF) is a device that is connected in parallel to and cancels the reactive and harmonic currents from a group of nonlinear loads so that the resulting total current drawn from the AC mains is sinusoidal. This paper presents a unified constant-frequency integration (UCI) APF control method based on one-cycle control. This method employs an integrator with reset as its core component to control the pulse width of an AC-DC converter so that its current draw is precisely opposite to the reactive and harmonic current draw of the nonlinear loads. In contrast to previously proposed methods, there is no need to generate a current reference for the control of the converter current, thus no need for a multiplier and no need to sense the AC line voltage, the APF current, or the nonlinear load current. Only one AC current sensor is used to sense the AC main current and one DC voltage sensor is used to sense the DC capacitor voltage. The control method features constant switching frequency operation, minimum reactive and harmonic current generation, and simple analog circuitry. It provides a low cost and high performance solution for power quality control. Steady-state and dynamic study is presented in this paper. Design example is given using a two-level AC-DC boost topology. A prototype was developed to demonstrate the performance of the proposed APF. This control method is generalized to control a family of converters that are suitable for APF applications. All findings are supported by experiments and simulation     

基于单周期控制的工作于DCVM的PFC CUK电路设计

文章针对工作于DCM的DC/DC变换器电流应力大、损耗大、效率低、输入电流纹波大等问题,采用工作于不连续电容电压模式(DCVM)的Cuk变换器作为APFC的主电路,并利用单周期控制技术实现闭环控制,不仅能够自动消除一个周期内的稳态和瞬态误差,而且可以有效地抑制输入扰动,动态响应快,克服了传统PWM电压反馈控制的缺陷。仿真结果证明了理论分析的正确性。     

Time quantity one-cycle control for power-factor correctors

A time quantity one-cycle control method is proposed in this paper for unity power-factor AC-DC power converters. Power converters controlled by this method operate at constant switching frequency, require no current sensing, have a simple control circuit and exhibit resistive input impedance at the AC side. A feedback loop design method is provided to minimize the current distortion when the output voltage ripple is not negligible. Experimental results confirmed the theoretical prediction     

A unity power factor PWM rectifier with DC ripple compensation

This paper presents a new topology for a pulsewidth modulation (PWM) rectifier which achieves unity power factor on the AC supply side and ripple reduction on the DC output side. The main circuit of this rectifier consists of a conventional PWM rectifier and a pair of additional switches. The switches and PWM rectifier are controlled such that the ripple current on the DC line is reduced, and unity power factor is achieved on the AC line. As a result, this circuit does not require a large DC capacitor or a passive LC resonant circuit. Furthermore, control of the additional switches and PWM rectifier requires only a simple control circuit. The effectiveness of this circuit was confirmed by experiments and analysis. The rectifier is useful for uninterruptible power systems (UPSs) and DC power supplies, especially for cases in which batteries are connected to the DC line     

Adaptive current-threshold detector for an adaptive on-time Buck converter at light load

The adaptive on-time control technique has been tremendously utilized in DC–DC converters for its fast transient response, easier design and high efficiency at light load. In some applications the output voltage ripple of DC–DC converters has to be maintained within an acceptable level to achieve superior performance, which depends largely on the load current for adaptive on-time buck converters when operating in discontinuous conduction mode. This paper proposes an adaptive current-threshold detection method for reducing the output voltage ripple. An actual detector circuit is presented to implement the method. This circuit monitors the relationship between the peak inductor current and the load current at light load. Then it outputs a logic signal which controls the turn-on time of the main power MOSFET and hence the peak inductor current. Therefore, the magnitude of the output voltage ripple is controlled. The current-threshold detection method has been verified in an adaptive on-time buck converter by simulation and experimental results. The proposed method can also be used in other constant on-time converters.     

半导体激光管驱动电源设计与实现

为提高半导体激光器光功率输出稳定性,并保证激光器安全、可靠工作,设计了半导体激光器的驱动电源。驱动电源主电路采用同步DC／DC方式,输出效率高;驱动电路可以产生200kHz触发脉冲,降低了输出电流的纹波,保证激光器输出功率稳．定;驱动电路带有过压比较器及过流比较器,保证激光器安全工作。经过仿真和实验表明：该驱动电源在20A工作时效率达到85％以上．纹波小于5％。     

A new PWM controller with one-cycle response

This paper proposes a new nonlinear control technique that has one-cycle response, does not need a resetable integrator in the control path, and has nearly constant switching frequency. It obtains one-cycle response by forcing the error between the switched variable and the control reference to zero each cycle, while the on and off pulses of the controller are adjusted each cycle to ensure near constant switching frequency. The small switching frequency variation due to changes in the reference signal and supply voltage and delays in the circuit are quantified. Using double-edge modulation, the switching frequency variation is further reduced, thus, the associated signal distortion is minimized. An experimental 0-20 kHz bandwidth 95 W RMS power audio amplifier using the control method demonstrates the applicability of this control technique for high-fidelity audio applications. The amplifier has a power supply ripple rejection (PSRR) of 63 dB at 120 Hz. Additionally, the total harmonic distortion plus noise (THD+N) is less than 0.07% measured with a power supply ripple of 15%     

电动汽车用充电器与驱动器一体化拓扑研究

摘要：针对电动汽车驱动与充电系统分离所带来的诸多问题,提出了一种电动汽车驱动和充电系统一体化电力电子拓扑结构及相应控制策略, 该拓扑正向工作时驱动电机为电动状态、反向工作时给蓄电池充电为充电状态。一体化拓扑在充电时共用驱动系统的主电路和控制电路,无需额外增加AC/DC和DC/DC充电器,提高了功率密度、降低了产品成本、降低了系统故障率、减少了安装空间等,解决了传统电动汽车驱动与充电分离带来的问题。最后针对提出的一体化拓扑和控制策略进行了实验验证,试验中所采用电机型号为80CB050C,结果表明该一体化拓扑在充电实验时直流母线电压纹波在6.9%附近,经过Buck电路中电机绕组进一步滤波后,充电电压及电流纹波基本稳定在0.3%以内,验证了所提方法的正确性和可行性,具有一定的应用前景和实用价值。