秦山核电站应急柴油发电机电压校正器退出原因分析

应急柴油发电机(EDG)作为核电站安全系统最关键设备,其功能主要是在规定的环境条件和地震载荷下,事故期间和事故后按指定加载程序加载,为各类应急设备提供相应的电力,确保核电厂反应堆安全地关闭、排除余热。电压校正器用于调节应急柴油发电机(EDG)的励磁电流,当其退出时将影响EDG的可靠性。该文通过一起电压校正器退出故障,逐一分析了EDG的励磁调节原理、电压校正器的电路及各模块的功能,并最终查明故障点,对今后的设备维护和原因分析具有借鉴意义。

新型动态电压凹陷校正器研究

提出一种基于串并联的动态电压凹陷校正器(DVSC)补偿三相电力系统电压凹陷或隆起新方法,该方法较现有动态电压调节器(DVR)及配电静态补偿器(D-STATCOM)能在大幅降低成本的同时有效地提供保护。该方案基于电压升压变换电路,能够通过升压或降压快速校正电压,其主要特点是具有最小能量储存的单阶功率变换电路。介绍了新型电压控制拓扑、晶闸管旁路开关的交换逻辑。仿真和实验结果证明了该方法的有效性。

EDG励磁装置的设计改进

分析了EDG(Emergency Diesel Generator,应急柴油发电机)励磁装置的工作原理,介绍了励磁装置改进原因。根据运行维修经验进行了器件参数的重新核算,重新设计了电压校正器,提出了功能改进和性能提升方案,并实施1E级鉴定,对改造后的试验情况作了简要介绍。EDG励磁装置改造完成后,安全稳定运行至今(13年),改造经验可供同行参考。

Design and Implementation of High Power Factor LED Driver with Hot Swap, Smart Output Voltage Regulation and Dimming Control

In this paper, a high power factor LED driver with hot swap, smart output voltage regulation and dimming control is proposed. The dimming control is used to change LED brightness. During converter is working, the hot swap function supply users to remove and insert LED module. The smart output voltage can regulate quickly and rightly output voltage in different number of LED series connection. The system consists two stages, one is 50 W flyback converter which is used as power factor corrector, it is input source is 110-220 V, PF （power factor） is about 0,994. The other is Boost DC/DC converter, it can offer 35-60 V of output voltage. Finally, a prototype has been built and tested. The simulation and experimental results are shown to verify the feasibility of the proposed method.

无刷同步发电机可控相复励系统的电路模型及应用

介绍了具有无刷同步发电机可控相复励系统一般意义的组成、相复励系统的工作原理及电路模型、自动电压校正器的调节作用以及在系统调试中的应用实例。