共查询到19条相似文献,搜索用时 187 毫秒
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三相PWM整流器控制系统研究 总被引:2,自引:1,他引:1
为验证三相PWM整流器的性能,设计了基于TMS28346的三相PWM整流器系统.为方便控制建立两相旋转坐标系统,引入矢量控制技术.为实现直流侧电压的稳定控制和有功与无功功率的解耦控制,采取了电压外环和电流内环的控制策略.为保证系统稳定,控制系统中实现直流电压和功率的速率调节控制.在搭建的双馈风力发电控制实验平台上采用空间矢量脉宽调制技术进行了实验研究,实验结果表明三相PWM整流器能够实现能量四象限传递和功率解耦控制,所设计的控制器具有很好的稳态和动态性能. 相似文献
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建立了三相电压型PWM整流器在d-q坐标系下的非线性数学模型,通过非线性输入变换和引入交、直流侧的功率平衡方程,推得三相电压型PWM整流器的线性化数学模型;由此提出了一种电流内环基于状态反馈解耦、电压平方外环基于功率平衡理论的双闭环矢量控制策略,并进行了Matlab/Simulink仿真验证。最后,对基于6MBP20RH060和TMS320F2812设计制作的样机进行了试验,达到了较好的效果。 相似文献
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Toshihiko Tanaka Shinji Fujikawa Shigeyuki Funabiki 《Electrical Engineering in Japan》2003,144(2):53-62
This paper proposes a new method of damping harmonic resonance in the DC link of a large‐capacity rectifier‐inverter system, such as in rapid‐transit railways. A voltage‐source PWM converter is connected in series to the DC capacitor of the rectifier through a matching transformer, acting as a damping resistor to the DC capacitor current. No filters are needed to extract harmonic components from the DC capacitor current. This results in a quick response and highly stable damping. The relationship between the control gain of the PWM converter and the required rating is theoretically discussed. We show that the required rating is less than one‐thousandth of that previously proposed. In particular, regenerating the power consumed by the PWM converter is very important because of the large power in practical systems. Normally, an additional PWM inverter is connected to the DC bus of the PWM converter to regenerate the consumed power. The additional inverter regenerates the DC power to the AC source through a transformer. This method, however, makes the damping circuit complex, thus the proposed method for the DC‐link harmonic resonance is less practicable. In this paper, a simple and novel scheme that utilizes the DC‐link voltage of the rectifier as a DC source for the PWM converter is proposed. The excellent practicability of the proposed damping method with the novel regenerating scheme is confirmed using digital computer simulation. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 144(2): 53–62, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10172 相似文献
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传统双向能源充放电控制系统忽略了对电流内环和电压外环的控制,导致传统系统的应用效果不理想。为此,设计基于车联网的V2G模块开发及双向能源充放电控制系统。利用双向DC/DC控制电压升降,保持充放电情况下电流电压的恒定,利用电压电流双闭环的空间电压矢量,控制三相半桥电压型PWM整流器,通过PI调节器控制电流内环和电压外环,利用受控状态下的负载电流双向流动,实现双向DC/DC变换器的控制,最终实现能量的双向流动。试验结果表明:所设计的系统电池组电压、电流在0.1 s内即可趋于稳定,且三相交流侧的输出电压与单相交流侧电压分别在约0.02 s和0.12 s时达到稳定。电压相位与电流相位之间相差180°,电流波形良好,交流侧电流谐波得到有效抑制。 相似文献
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传统的级联型高压变频器只能电动运行,是电网污染的主要来源之一,为克服此不足,这里提出了一种应用三相PWM整流技术的级联型高压变频器.该变频器采用双闭环控制策略,具有输出电压恒定、单位功率因数运行等特点,可实现电能回馈电网,解决了电网的污染问题.通过实际应用显示,该变频器在降低谐波,抑制直流侧电容两端电压波动等方面有很大... 相似文献
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《Electric Power Systems Research》2001,58(3):157-167
A single-phase three-level pulsewidth modulation (PWM) AC/DC converter with the function of power factor corrector and active power filter is proposed to reduce harmonic currents flowing into the power system and to draw a nearly sinusoidal current with unity power factor. The circuit topology of the adopted three-level PWM AC/DC converter is based on a conventional two-level full-bridge rectifier and one AC power switch. The control signals of the power switches are derived from the voltage balance compensator, current controller and detected operation region of mains voltage. A three-level PWM voltage pattern on the AC side of the converter in each half cycle of mains frequency is generated. Computer simulations are implemented to confirm the operation of the adopted converter with the function of power factor corrector and active power filter. 相似文献
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三电平PWM整流器用于直驱风力发电系统 总被引:1,自引:1,他引:1
直驱型风力发电系统的风力发电机需要通过大功率交直交变流器即全功率变流器将风力发电机直接并网,而开关器件水平无法满足全功率变流器的要求,因此研究了二极管箝位三电平PWM整流器在直驱型风力发电系统中的应用。针对这一拓扑和直驱型风力发电系统的特点,采用基于PWM整流器模型的跟踪指令电压矢量的空间矢量脉宽调制(SVPWM)电流控制策略,使用龙格库塔解析法和Matlab仿真了负载从半载到满载变化时,三电平整流器直流电压的动态响应波形,交流侧电压、电流的变化趋势以及d-q坐标系下有功、无功电流分量跟随参考量变化的波形等。结果表明,该PWM整流器可有效抑制注入电网的谐波,减小交流侧的电流波形畸变;在负载突变时保持直流电压恒定,输出有功、无功可调且动态跟随性能较好。三电平PWM整流器作为全功率变流器的整流部分适合于直驱型风力发电系统的应用。 相似文献
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在分析了交流电源直接并联存在的不足的基础上,提出了采用三相PWM整流—并联—PWM逆变的供电模式。三相PWM整流器输出的直流电压含有谐波导致直流电压不断脉动,交流电源通过三相PWM整流器进行直流并联时,必须考虑电压脉动的影响。针对此问题,通过在整流器输出侧添加电阻的方式,抑制了电压脉动对并联稳定的影响;分析了并联模块接入时机对并联过程的影响;提出了一种实现并联条件下,单个模块输出功率自由分配的控制方式。最后,通过仿真验证了该控制方式的可行性。 相似文献