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由于串联电池组充电时的不均衡,导致电池循环寿命缩短,均衡充电成为了串联电池组充电技术中重要的考虑因素。为改善串联电池组充电时的不平衡,应保证电池组中所有电池的电压都处在同一水平状态。本文设计一种用单片机控制的双向无损均衡充、放电模块,并通过实验验证了该模块的效果。 相似文献
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Abstract—This article proposes a novel zero-current switching series resonant inverter-fed voltage multiplier based high-voltage DC-DC converter. The series resonant inverter in the proposed topology has two power switches (insulated-gate bipolar transistors), two resonant capacitors, and only one high-voltage transformer with center-tapped primary windings. The power switches are connected in the form of a half-bridge network. The leakage inductances of the transformer's primary windings together with resonant capacitors form two series resonant circuits. The series resonant circuits are fed alternately by operating power switches with an interleaved half-switching cycle. The secondary winding of the high-voltage transformer is connected to a voltage multiplier circuit to rectify and boost the voltage. The converter operates in discontinuous conduction mode, and its output voltage is regulated by pulse-frequency modulation. Therefore, all the power switches turn ON and OFF at the zero-current switching condition. The main features of the proposed converter are lower power loss, less cost, and smaller size compared to previously proposed series resonant high-voltage DC-DC converters. The experimental results of a 130-W prototype of the proposed converter are presented both for dynamic and steady-state operation. The results confirm the excellent operation and performance of the converter. 相似文献
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两个不同结构六相永磁同步电机串联驱动系统 总被引:1,自引:0,他引:1
由于多相电机较以前传统的三相电机优点明显,因此越来越受到关注.其优点之一就是多台多相电机可以进行串联,并且串联的多台电机由一台电压源型逆变器供电,减少了逆变器支路数量,使设备的体积大大减小.系统由一台对称六相永磁同步电机(PMSM)和一台夹角为0°的六相PMSM组成,两台电机的定子绕组按照一定的方式联接,运用矢量控制技术使两电机解耦,两电机实现独立控制.从电机的结构入手,分析两电机原理及串联规则,并建立两电机串联的数学模型,最后确定串联驱动系统的动态解耦性. 相似文献
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采用绝缘栅双极型晶体管(insulated-gate bipolar transistor,IGBT)串联阀组可使得统一电能质量控制器(unified power quality conditioner,UPQC)换流器结构紧凑,控制简单。其中串联IGBT的动态均压及换流器的带载实验方法是关键技术。采用有源电压箝位方法实现串联IGBT的动态均压,并采用以UPQC一侧换流器为电源、另一侧换流器为负载的方法,实现UPQC换流器的带载实验,验证基于IGBT串联阀组的换流器的有效性。 相似文献
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通过直流风电机组(DC wind turbine, DCWT)建设直流风电场实现风能的直流汇集与直流传输是海上风电系统的主要发展方向之一。为了使DCWT具备高压绝缘隔离、能量双向流动以及直流短路故障自清除能力,提出了一种适用于串联型全直流发电系统的新型DCWT拓扑。该DCWT拓扑采用了H桥结构的DC/DC变换器代替传统的隔离型DC/DC变换器,将DCWT直接串联并加以调制实现低压直流到高压直流的变换。基于PSCAD/EMTDC搭建了基于新型DCWT的串联型全直流发电系统仿真模型。经风电系统的DCWT在输出功率均衡、输出功率不均衡、高压直流母线电压波动等稳态运行工况以及故障DCWT动态切入切出等故障运行工况下的仿真,验证了该DCWT的输出特性、系统的运行特性以及系统对故障DCWT的处理能力,提高了直流风电场的运行可靠性与灵活性,为直流风电场的建设提供了一种切实可行的解决方案。 相似文献
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