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直流输电系统换流变压器短路阻抗的选择
引用本文:杨汾艳,徐政.直流输电系统换流变压器短路阻抗的选择[J].高电压技术,2008,34(8):1628-1632.
作者姓名:杨汾艳  徐政
作者单位:1. 广东电网公司电力科学研究院,广州,510600
2. 浙江大学电气工程学院,杭州,310027
基金项目:国家科技支撑计划重大项目
摘    要:换流站主回路参数关系到整个直流输电系统的运行性能和技术经济指标,是直流输电系统设计的主要部分。为此,针对直流输电系统换流站主回路中换流变压器短路阻抗的参数选择原则及方法进行了相关研究。综合考虑各项制约因素,归纳出选择换流变压器短路阻抗时所需遵循的原则,即满足晶闸管换流阀的浪涌电流水平要求、换流器消耗的无功功率最小、及换流站成本最低。重点推导了表征晶闸管换流阀最大短路冲击电流与换流变压器短路阻抗之间关系的公式,并定性分析了换流变压器短路阻抗的大小对换流站总体费用的影响。研究结果表明,换流阀的浪涌电流水平是选择短路阻抗时的决定性因素,换流变压器最佳短路阻抗值应根据换流阀的浪涌电流水平进行选择。最后,葛南直流输电工程的实例验证了所提出的换流变压器短路阻抗选择原则的合理性。

关 键 词:高压直流输电  国产化  换流变压器  短路阻抗  参数选择  换流阀  浪涌电流

Selection of the Converter Transformer's Short Circuit Impedance for HVDC Projects
YANG Fen-yan,XU Zheng.Selection of the Converter Transformer''''s Short Circuit Impedance for HVDC Projects[J].High Voltage Engineering,2008,34(8):1628-1632.
Authors:YANG Fen-yan  XU Zheng
Affiliation:1.Electric Power Research Institute of Guangdong Power Grid Corporation,Guangzhou 510600,China;2.College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
Abstract:The selection of the converter transformer's short circuit impedance for HVDC projects is researched.With the restricting factors considered synthetically,three main principles for selecting the converter transformer's short circuit impedance are induced,i.e.satisfying the demands of the thyristor valve surge current,minimizing the reactive power consumption of the converters,and keeping the lowest total cost of converters.The formula representing the relationship between the maximum of thyristor valve surge current and the transformer's short circuit impedance is derived,and the influence of the transformer's short circuit impedance on the converters' total cost is analyzed qualitatively.From analysis and comparison,it is revealed that the level of the thyristor valve surge current is the determinant factor when the converter transformer's short circuit impedance is selected,and the conclusion is drawn that the short circuit impedance can be optimized in terms of the thyristor valve surge current.Finally,the proposed parameter selection principle is verified by taking Ge-Nan HVDC project as an example.
Keywords:HVDC  localization  converter transformer  short circuit impedance  parameter selection  thyristor valve  surge current
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