混合式限流器换流回路的参数优化设计
发布时间：2019-01-26 09:54
【摘要】：针对10 kV配电网系统的一种传统混合式故障限流器进行了仿真研究,该限流器由主回路的快速开关及换流回路组成,换流回路由预充电电容及电感和晶闸管组成。研究结果表明在限流的过程中,快速开关两端的恢复电压上升速率及峰值大小与换流回路各器件的参数有很大的关系。若参数匹配不当,则存在开关被重击穿的可能性。文中介绍了在开关两端并联晶闸管的改进型方案,当开关中的短路电流过零后,该晶闸管会起到续流作用,以保证开关存在利于介质恢复的低电压时间。通过理论分析发现,该低电压时间值的长短受换流回路的电容电感参数影响较大,具体研究了低电压时间与这些参数的变化关系,并通过低压模拟实验验证了关系的正确性。在实际的快速开关设计中,可通过调节这些参数来得到合适的低电压时间值,从而减小对开关机构速度及断口介质击穿强度特性的要求。
[Abstract]:A traditional hybrid fault current limiter for 10 kV distribution network is simulated. The current limiter is composed of fast switch and converter circuit of main circuit, which is composed of precharged capacitance, inductance and thyristor. The results show that the rising rate and peak value of the recovery voltage at the two ends of the fast switch are closely related to the parameters of each device in the converter circuit during the current limiting process. If the parameters are not matched properly, there is the possibility that the switch will be knocked through. An improved scheme of parallel thyristor at both ends of the switch is introduced in this paper. When the short circuit current in the switch crosses zero, the thyristor will play the role of a continuous current, so as to ensure that the switch has a low voltage time conducive to dielectric recovery. Through theoretical analysis, it is found that the length of the low voltage time is greatly affected by the capacitance inductance parameters of the converter circuit. The relationship between the low voltage time and these parameters is studied in detail, and the correctness of the relationship is verified by the low voltage simulation experiment. In the practical design of fast switch, the suitable low voltage time value can be obtained by adjusting these parameters, so as to reduce the requirements of the speed of the switch mechanism and the breakdown strength of the fracture dielectric.
【作者单位】： 电力设备电气绝缘国家重点实验室西安交通大学;平高集团有限公司;
【基金】：国家自然科学基金资助项目(51221005)~~
【分类号】：TM471
[Abstract]:A traditional hybrid fault current limiter for 10 kV distribution network is simulated. The current limiter is composed of fast switch and converter circuit of main circuit, which is composed of precharged capacitance, inductance and thyristor. The results show that the rising rate and peak value of the recovery voltage at the two ends of the fast switch are closely related to the parameters of each device in the converter circuit during the current limiting process. If the parameters are not matched properly, there is the possibility that the switch will be knocked through. An improved scheme of parallel thyristor at both ends of the switch is introduced in this paper. When the short circuit current in the switch crosses zero, the thyristor will play the role of a continuous current, so as to ensure that the switch has a low voltage time conducive to dielectric recovery. Through theoretical analysis, it is found that the length of the low voltage time is greatly affected by the capacitance inductance parameters of the converter circuit. The relationship between the low voltage time and these parameters is studied in detail, and the correctness of the relationship is verified by the low voltage simulation experiment. In the practical design of fast switch, the suitable low voltage time value can be obtained by adjusting these parameters, so as to reduce the requirements of the speed of the switch mechanism and the breakdown strength of the fracture dielectric.
【作者单位】： 电力设备电气绝缘国家重点实验室西安交通大学;平高集团有限公司;
【基金】：国家自然科学基金资助项目(51221005)~~
【分类号】：TM471
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