文章针对一起220 kV电容式电压互感器(Capacitive Voltage Transformer,CVT)二次电压异常故障进行分析。首先,对二次电压异常原因进行了全面分析;其次,基于红外测温发现CVT的电磁单元异常高温现象,进行介损、电容量测量和绝缘试验分析,...文章针对一起220 kV电容式电压互感器(Capacitive Voltage Transformer,CVT)二次电压异常故障进行分析。首先,对二次电压异常原因进行了全面分析;其次,基于红外测温发现CVT的电磁单元异常高温现象,进行介损、电容量测量和绝缘试验分析,发现该CVT的二次线缆表皮破损,进而导致二次回路产生短路电流和铁芯磁通饱和,最终导致避雷器击穿和次级绕组电压异常;最后,提出了预防CVT发生此类故障的措施。展开更多
针对双浮筒直驱式波浪发电系统的工作效率较低问题,提出了一种基于PID(Proportional Integral Derivative)控制的系统优化方法。首先根据波浪力学理论,计算出了双浮筒直驱式波浪发电系统的外浮筒(动浮筒)在自然条件下的运行特性,计算结...针对双浮筒直驱式波浪发电系统的工作效率较低问题,提出了一种基于PID(Proportional Integral Derivative)控制的系统优化方法。首先根据波浪力学理论,计算出了双浮筒直驱式波浪发电系统的外浮筒(动浮筒)在自然条件下的运行特性,计算结果表明,受到波浪频率、垂直波浪速度和波浪周期固有特性的影响,外浮筒的垂直运动速度不能与波浪的垂直运动速度达到共振,进而也就导致波浪能转换成电能的工作效率较低。当采用基于PID控制算法对该波浪发电系统进行优化控制之后,波浪能转换成电能的效率有了很大的提高。详尽的算例分析和仿真结果表明本文提出的优化控制方法有效、可行。展开更多
In this paper, the design, construction and ocean testing of a wave energy conversion system are studied. Based on the motion characteristics of double buoys in ocean waves, a wave energy conversion system with perman...In this paper, the design, construction and ocean testing of a wave energy conversion system are studied. Based on the motion characteristics of double buoys in ocean waves, a wave energy conversion system with permanent magnet tubular linear generator （PMTLG） is proposed to convert ocean wave energy into electricity. The wave energy conversion system was installed in the Yellow Sea near Lianyungang, China. The ocean test re- suits indicate that it had dynamic and static performance, and obtained an expected amount of electricity. The calcu- lation result indicates the average output power was about 1 000 W, and the conversion efficiency from wave en- ergy into electricity was 1.4%. In addition, the wireless data communication, mechanics and oceanography were also discussed.展开更多
文摘文章针对一起220 kV电容式电压互感器(Capacitive Voltage Transformer,CVT)二次电压异常故障进行分析。首先,对二次电压异常原因进行了全面分析;其次,基于红外测温发现CVT的电磁单元异常高温现象,进行介损、电容量测量和绝缘试验分析,发现该CVT的二次线缆表皮破损,进而导致二次回路产生短路电流和铁芯磁通饱和,最终导致避雷器击穿和次级绕组电压异常;最后,提出了预防CVT发生此类故障的措施。
文摘针对双浮筒直驱式波浪发电系统的工作效率较低问题,提出了一种基于PID(Proportional Integral Derivative)控制的系统优化方法。首先根据波浪力学理论,计算出了双浮筒直驱式波浪发电系统的外浮筒(动浮筒)在自然条件下的运行特性,计算结果表明,受到波浪频率、垂直波浪速度和波浪周期固有特性的影响,外浮筒的垂直运动速度不能与波浪的垂直运动速度达到共振,进而也就导致波浪能转换成电能的工作效率较低。当采用基于PID控制算法对该波浪发电系统进行优化控制之后,波浪能转换成电能的效率有了很大的提高。详尽的算例分析和仿真结果表明本文提出的优化控制方法有效、可行。
基金Supported by the National Natural Science Foundation of China(No.41076054)Special Foundation for State Oceanic Administration of China(No.GHME2011GD02)Scientific Research Foundation of Graduate School of Southeast University(No.YBJJ1416)
文摘In this paper, the design, construction and ocean testing of a wave energy conversion system are studied. Based on the motion characteristics of double buoys in ocean waves, a wave energy conversion system with permanent magnet tubular linear generator （PMTLG） is proposed to convert ocean wave energy into electricity. The wave energy conversion system was installed in the Yellow Sea near Lianyungang, China. The ocean test re- suits indicate that it had dynamic and static performance, and obtained an expected amount of electricity. The calcu- lation result indicates the average output power was about 1 000 W, and the conversion efficiency from wave en- ergy into electricity was 1.4%. In addition, the wireless data communication, mechanics and oceanography were also discussed.
