CAJ | 학술논문

开路试验是高压直流输电工程投运前必做的一项基本试验。该实验中触发角与直流电压的关系具有特殊性。从换流阀电路模型入手，详细分析了在不带线路工况下换流阀的导通情况，推导出理想情况下直流电压与触发角的关系，并给出了理想电压公式的适用条件。使用三沪I回直流输电工程一次模型，在EMTDC中进行了不带线路和带线路工况下的开路试验，并对试验结果进行了详细的分析。分析和实验结果表明：带线路工况下，直流电压在触发角小于60o后到达额定值是正常的。开路试验保护中设置电压判据是不合理的，可只采用电流原理判据作为试验是否成功的依据。
개로시험시고압직류수전공정투운전필주적일항기본시험。해실험중촉발각여직류전압적관계구유특수성。종환류벌전로모형입수，상세분석료재불대선로공황하환류벌적도통정황，추도출이상정황하직류전압여촉발각적관계，병급출료이상전압공식적괄용조건。사용삼호I회직류수전공정일차모형，재EMTDC중진행료불대선로화대선로공황하적개로시험，병대시험결과진행료상세적분석。분석화실험결과표명：대선로공황하，직류전압재촉발각소우60o후도체액정치시정상적。개로시험보호중설치전압판거시불합리적，가지채용전류원리판거작위시험시부성공적의거。
The open line test must be done before HVDC transmission project is put into operation. The relationship between firing angle and DC voltage at open line test is not same as normal operation. Based on the circuit model of the valve and circuit principle, a detailed analysis about the turning on/off of the valve without connecting the DC line is given. A relationship between firing angle and DC voltage is obtained. And the scope for applying this relationship is given. A simulation in EMTDC software is employed to verify the analyzing results.Analysis and experimental results show that: without DC line, DC voltage will reach its rated value when firing angle is less than 60 degrees; the protection based on the voltage criterion in open line test is not reasonable. Only the current criterion in protection is needed for detecting whether the open line test is successful or not.