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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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在模拟滤波器的设计中,综合转移函数的方法总的来说分为两类,即用无源网络综合和用有源网络综合实现.目前常用的是用有源RC网络综合实现滤波器,实现有源RC滤波器的基本方法有直接法和级联法.文中介绍了级联法实现有源RC滤波器的典型过程,用此方法列举了一个高通滤波器的实现,并得到了正确的仿真图. 相似文献
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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。 相似文献
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《现代电子技术》2016,(20):104-107
H桥级联多电平逆变器可实现光伏电池单级式并网,但是由于该系统只在各H桥单元存在一次能量变换,除了要考虑常规逆变器控制及并网控制外,还需要同时考虑到各H桥单元所接光伏电池最大功率点跟踪(MPPT)及H桥传输功率匹配的问题。对此提出对每个H桥单元加入一个MPPT控制器的控制方法,使得各H桥所接光伏电池均能工作在各自的最大功率点,能有效提高各H桥单元光照不均衡条件下MPPT跟踪的准确性和稳定性,同时基于各H桥单元最大功率跟踪过程中的电压误差,对各H桥的SPWM调制波幅值进行比例调节,从而实现各H桥传输功率与光伏电池最大输出功率相匹配。最后在Matlab/Simulink仿真平台上进行了系统的仿真实验,结果表明以七电平级联光伏并网逆变器为例证实了该系统的可行性和可靠性。 相似文献
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对三相桥式逆变电路原理及其SPWM控制原理进行简单的分析,针对开环SPWM电压的不稳定提出一种电压闭环SPWM控制模型。在Matlab/Simulink软件环境中分别建立了三相SPWM逆变器开环仿真模型和具有电压调节作用的SPWM闭环仿真模型,分别对其进行仿真分析。仿真结果表明电压闭环SPWM控制比开环SPWM控制具有更好的动静态特性。得出的结论对三相桥式逆变器的原理的理解、参数的确定、电路的设计有一定的参考价值和指导意义。 相似文献
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理论分析了光纤干涉型光学相控阵扫描角度与扫描控制电压的关系,提出了扫描角度与电压关系的实验方法,即按照场点定点的光强间接测定一定扫描控制电压对应的扫描角度;采用M-Z型干涉光路来模拟2光路的光纤干涉型相控阵进行模拟实验,通过改变相位调制器上的控制电压,对场点定点接收到的光强大小进行测试,反演出光纤干涉型相控阵实际的扫描角度。实验结果表明:扫描控制电压在相位调制的半波电压范围内,扫描控制电压要比集成波导阵列的控制电压小得多,扫描角度为0~6.2 mrad,在此范围内,扫描角度的实验值与理论值较好吻合。该模拟实验研究可以为光纤干涉型光学相控阵的远场扫描特性的进一步研究提供参考。 相似文献
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This article presents the investigations on the constant frequency asymmetric voltage cancellation control in the AC–AC resonant converter-fed domestic induction heating system. Conventional fixed frequency control techniques used in the high frequency converters lead to non-zero voltage switching operation and reduced output power. The proposed control technique produces higher output power than the conventional fixed-frequency control strategies. In this control technique, zero-voltage-switching operation is maintained during different duty cycle operation for reduction in the switching losses. Complete analysis of the induction heating power supply system with asymmetric voltage cancellation control is discussed in this article. Simulation and experimental study on constant frequency asymmetric voltage cancellation (CFAVC)-controlled full bridge series resonant inverter is performed. Time domain simulation results for the open and closed loop of the system are obtained using MATLAB simulation tool. The simulation results prove the control of voltage and power in a wide range. PID controller-based closed loop control system achieves the voltage regulation of the proposed system for the step change in load. Hardware implementation of the system under CFAVC control is done using the embedded controller. The simulation and experimental results validate the performance of the CFAVC control technique for series resonant-based induction cooking system. 相似文献
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A new gating pulse scheme is proposed for the control of DC-to-DC pulsewidth-modulated (PWM) bridge converter that provides zero-voltage switching (ZVS) for all the switches for a wide variation in load and input voltage. This new complementary fixed-edge gating control scheme is compared to the traditional phase shift control scheme. Modes of operation are presented and analyzed. Based on the analysis, design procedure and design curves are obtained. An optimum design is given and a design example is presented. Results obtained from PSPICE simulation for the converter designed are given to verify the performance of the proposed converter for varying load as well as line voltage. Detailed results obtained from a 500 W experimental converter are given to verify the advantages of the proposed gating scheme 相似文献
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文章在分析了传统的PFC变换器控制原理后,针对滤波过程使用低通滤波器带来的带宽限制,提出了一种新的控制方法,能在PFC变换器中克服带宽的限制,从而提高输出电压的动态响应。该方法用一个比较器取代低通滤波器,并应用一个多层前馈神经网络(MLFNN)来精确估计谐波成分。通过Matlab仿真表明,由神经网络控制的变换器,在没有滤波装置的情况下,也能消除直流电压反馈路径中的纹波电压和瞬态输出电压正尖峰和负尖峰,从而允许大带宽设计电压控制回路。同时,通过数字信号处理器实现的系统实验验证了该方案的正确性。 相似文献
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CHENYuebin 《半导体光子学与技术》1998,4(3):174-178
Q-double effect of different balance bridge voltage controlled crystal oscillator(DBVCXO)is quantitatively analysed by the computer simulation. 相似文献
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DC voltage sensorless single-phase PFC converter 总被引:2,自引:0,他引:2
We propose a simple DC voltage sensorless single phase PFC converter by detecting an AC line voltage waveform. Both DC voltage and AC current sensors used in the conventional PFC converter are not required to construct the control system. The conventional converter circuit with a boost chopper circuit in the DC side from a rectifier circuit is used as the main PFC converter circuit. In the control system, the circuit parameters such as a series inductance L and equivalent load resistance value R/sub d/ are used to generate the sinusoidal current waveform. The DC voltage is directly controlled by the command input signal k/sub d/(=E/sub d//E/sub a/) for the boost chopper circuit. The DC voltage regulation is small because of the feed forward control for the AC line voltage E/sub a/ and no dependence of the circuit parameters. The sinusoidal current waveform in phase with the AC line voltage can be obtained. The feasibility of the proposed control system is verified by some simulation and experimental results. 相似文献
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Jin Wang Peng F.Z. Anderson J. Joseph A. Buffenbarger R. 《Power Electronics, IEEE Transactions on》2004,19(5):1315-1322
The high installation cost is the major obstacle of the commercialization of the solid oxide fuel cell for distributed power generation. This paper presents a new low cost 10-kW converter system to overcome this obstacle. The proposed system consists of an isolated dc-dc converter to boost the fuel cell voltage to 400 V dc and a pulse-width modulated inverter with filter to convert the dc voltage to two split-phase 120-V ac. The dc-dc converter uses phase shifting to control power flow through a transformer with a metal oxide semiconductor field effect transistor full bridge on the low voltage side and a voltage doubler on the high voltage side. One IPM is used to realize the voltage doubler and the dc-ac inverter. Compared to the existing fuel cell converter systems, the proposed circuit has low cost, less component count, smaller size, and reduced dc-dc converter peak current. Simulation and experimental results are demonstrated. 相似文献