多并联支路型可控电抗器短路电抗对支路电抗和电流的影响

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摘要短路电抗对支路电抗和电流的影响是造成多并联支路型可控电抗器（Controllable Reactor of Multi-parallel Branch Type, CRMB）支路电抗和电流额定值的选取困难、以及设备利用率下降的重要原因。根据CRMB各支路晶闸管依次导通和关断的工作特点,采用递推算法求得了CRMB支路电抗和电流的计算公式。对这些计算公式的函数分析和算例分析后指出,支路电抗随着短路电抗的增大而减小;支路电流额定值随着短路阻抗的增大而增大,而其支路电流额定值利用率最小值随着短路电抗的增大而减小;为了提高CRMB设备利用率,CRMB短路电抗应小于一个由电流额定值利用率的最小值、CRMB支路容量递增系数和支路数决定的最大值,由此可以选取短路电抗、支路电抗和电流的设计额定值。研究结论可为CRMB的工程设计和变压器式可控电抗器的研究提供理论参考。

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关键词 ：多并联支路型可控电抗器, 短路电抗, 支路电抗, 支路电流

Abstract：The impact of the short-circuit reactance on the branch reactance and current is the important reason which causes a difficulty to select the branch reactance and current ratings of a controllable reactor of multi-parallel branch type(CRMB), and the decline in equipment utilization. According to the each branch thyristor working characteristics of orderly turn-on and turn-off, the CRMB branch reactance and the current calculation formulae are derived by the recursive algorithm. After the function analysis on the calculation formulae and the calculation of an example, it is pointed out that the branch reactances decrease with transformer short-circuit reactance increasing, the branch currents increase with transformer short-circuit reactance increasing and the utilization rate minimum of a branch current rated value decreases with transformer short-circuit reactance increasing. In order to improve the utilization rate of CRMB equipments, the short-circuit reactance of the power transformer of CRMB should be less than a maximum value determined by the rated current utilization rate minimum, the branch capacity increment coefficient and the branch number. Therefore the design ratings of the transformer short-circuit reactance, branch reactance and current of a CRMB are selected. The results of the paper can be used as the theoretical foundation for the future design of CRMB and the research on a controllable reactor of transformer type.

Key words： Controllable reactor of multi-parallel branch type short-circuit reactance branch reactance branch current

收稿日期: 2013-09-18 出版日期: 2014-08-05

PACS:

TM554

基金资助:国家自然科学基金（51167009, 51367010）,甘肃省科技计划（1304WCGA181）,甘肃省财政厅基本科研业务基金（213052）和兰州市科技计划（2013-4-111）资助项目; 按照可控电抗器技术原理的不同可以将其分为多种类型,文献[12]对此进行了最新总结; 其中,变压器式可控电抗器（Controllable Reactor of Trans- former Type, CRT）因其响应快和谐波电流小等优点备受关注; 文献[13-21]在文献[3-5]的基础上,对CRT的一些基本理论、继电保护、设计测试等问题进行了研究; 研究表明,当CRT的控制绕组通过晶闸管短路时,如果工作绕组和各控制绕组之间的短路阻抗不够大,短路电流将会超过额定值; 同时,各控制绕组之间磁耦合如果很强,后续投入运行（即短路）的控制绕组对已经投入运行（短路）的控制绕组电流具有很大影响; 所以,如何实现CRT“高阻抗和弱耦合”的设计原则是近些年CRT的研究工作中未能解决的关键和难点问题,也因此国家自然科学基金委针对该问题进行了立项

作者简介: 田铭兴男,1968年生,博士,教授,博士生导师,研究方向为电力系统电能质量分析及其综合治理、电力电子技术及其应用、电机电器及其控制。杨秀川男,1989年生,硕士研究生,研究方向为电力系统无功补偿和电压控制。

引用本文:

田铭兴, 杨秀川, 原东昇. 多并联支路型可控电抗器短路电抗对支路电抗和电流的影响[J]. 电工技术学报, 2014, 29(7): 237-243. Tian Mingxing, Yang Xiuchuan, Yuan Dongsheng. Short-Circuit Reactances of a Controllable Reactor of Multi-Parallel Branch Type’s Influence on Its Branch Reactances and Currents. Transactions of China Electrotechnical Society, 2014, 29(7): 237-243.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I7/237

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