CAJ | 학술논문

采样数据同步是智能变电站继电保护的关键问题。当采样数据通过过程层网络传输时，保护装置依赖于时钟源同步。提出了一种基于电压向量的数字化母线保护电流同步方案，在原有同步方案失效并导致合并单元采样失步的情况下，通过电压向量的相位差对采样数据进行同步处理，仍可保证母线保护继续投入运行。分析了同步方案的原理，介绍了同步方案的系统接线，给出了实施方案的细节：通过正序电压计算间隔采样的时间差；通过抛物线二次插值方法对采样数据进行同步处理；发生三相 PT 断线时需退出同步方案。RTDS 数模实验结果表明同步方案可保证各种工况下母线差动保护功能的正确性，证明了同步方案的有效性和可行性。
채양수거동보시지능변전참계전보호적관건문제。당채양수거통과과정층망락전수시，보호장치의뢰우시종원동보。제출료일충기우전압향량적수자화모선보호전류동보방안，재원유동보방안실효병도치합병단원채양실보적정황하，통과전압향량적상위차대채양수거진행동보처리，잉가보증모선보호계속투입운행。분석료동보방안적원리，개소료동보방안적계통접선，급출료실시방안적세절：통과정서전압계산간격채양적시간차；통과포물선이차삽치방법대채양수거진행동보처리；발생삼상 PT 단선시수퇴출동보방안。RTDS 수모실험결과표명동보방안가보증각충공황하모선차동보호공능적정학성，증명료동보방안적유효성화가행성。
In smart substation, synchronized sampling is the key issues for the relay protection. Protection device depends on the synchronization of external clock source, when sampling data is transmitted via Ethernet for process level. Sampling synchronization method based on voltage vector (SSMBVV) for busbar differential protection is proposed. When the original synchronization method loses effectiveness and the sampling of merging unit (MU) is out of step, sampling data can be synchronized through the phase difference of voltage vector, which can make busbar differential protection keep on working. The synchronization principle is analyzed, the system wiring diagram is introduced, and the implementation details for SSMBVV are given i.e. calculating the time difference between each MU sampling through the positive sequence voltage; synchronizing the sampling data using quadratic interpolation; synchronization process should be quitted when three-phase PT break is happening. The effectiveness and feasibility of the synchronization method are verified by results of RTDS simulation.