CAJ | 학술논문

针对直流输电单极大地运行方式下变压器直流偏磁的问题,提出中性点注入直流电流的抑制方法,并建立了电网的直流网络模型,分析了该方法的原理.通过仿真和实测数据的对比,验证了模型的有效性,并定量分析了土壤电阻率和补偿距离对补偿度的影响.仿真计算和广东义和变电站的实际应用情况表明:电流注入实质上起补偿变电站间母线电位差的作用,土壤电阻率增大或者补偿距离减少会导致注入电流增加,补偿度降低,在一般情况下补偿度小于0.6.最后以罗洞站抑直方案为例,验证了电流注入法不适用于复杂运行方式的变电站,并提出了解决方案.
침대직류수전단겁대지운행방식하변압기직류편자적문제,제출중성점주입직류전류적억제방법,병건립료전망적직류망락모형,분석료해방법적원리.통과방진화실측수거적대비,험증료모형적유효성,병정량분석료토양전조솔화보상거리대보상도적영향.방진계산화엄동의화변전참적실제응용정황표명:전류주입실질상기보상변전참간모선전위차적작용,토양전조솔증대혹자보상거리감소회도치주입전류증가,보상도강저,재일반정황하보상도소우0.6.최후이라동참억직방안위례,험증료전류주입법불괄용우복잡운행방식적변전참,병제출료해결방안.
Current injection method for transformers' DC bias under HVDC transmission ground return mode is presented. A DC network model of a power grid is set up to analyze the mechanism behind the proposed method. By comparison between simulation and measurement, validity of the method is checked and the impact of soil resistivity and compensation distance on compensation degree is analyzed. Simulation and application of the method in Yihe Substation shows that: the method actually functions as potential difference compensation to the bus of substation; higher soil resistivity demands longer compensation distance and higher injection current, but it leads to lower compensation degree and the compensation degree usually bellows 0.6. At the end, the example of Luodong Substation is listed to verify that current injection method is not applicable to substations under complex operation mode, then another solution is brought up.