换流阀开路电压的计算和应用

The Calculation and Application of Converter Valve Open Circuit Voltage

针对高压直流输电(HVDC)和融冰装置等阀组进行开路电压试验(OLT)的特殊工况,按照理想和非理想负荷情况推导出额定输入电压下,输出直流电压的近似计算公式。介绍了现场如何利用公式或者经公式绘制出的曲线对OLT参数和结果进行有效预测,并据此事先调整过电压保护定值,确保OLT正常有序进行。部分现场的实测数据和试验结果证实了所推导公式的正确性和实用性。

For high-voltage direct current transmission（HVDC） and de-icing device such as valve group of the special working condition of the open line test（OLT） is carried out, according to the ideal and non-ideal load condition is deduced under the rated input voltage, output the approximate calculation formulas of DC voltage.Introduces the site or how to use the formula through the curve formula graphics for OLT parameters and results to predict effectively,and adjust the overvoltage protection fixed value accordingly in advance, to ensure that the OLT normal and orderly.The scene of the measured data and the test results prove the correctness and practicability of the derived formula.