CAJ | 학술논문

在分析±800 kV特高压直流输电线路区内外故障、雷击等暂态过程的基础上,提出了一种特高压直流输电线路暂态能量保护新原理.该原理根据各种暂态过程中线路两侧低频能量差值的故障特征,实现了区内故障及其故障极的快速准确识别.基于PSCAD/EMTDC的大量仿真验证,结果表明该保护原理简单、可靠、实用性强,具有绝对的选择性,不受雷击干扰、两极线路电磁耦合和换相失败的影响,高阻接地故障仍具有足够的灵敏性,能满足特高压直流线路对保护性能的要求,可在当前高压直流控制保护系统硬件条件下实现.
재분석±800 kV특고압직류수전선로구내외고장、뢰격등잠태과정적기출상,제출료일충특고압직류수전선로잠태능량보호신원리.해원리근거각충잠태과정중선로량측저빈능량차치적고장특정,실현료구내고장급기고장겁적쾌속준학식별.기우PSCAD/EMTDC적대량방진험증,결과표명해보호원리간단、가고、실용성강,구유절대적선택성,불수뢰격간우、량겁선로전자우합화환상실패적영향,고조접지고장잉구유족구적령민성,능만족특고압직류선로대보호성능적요구,가재당전고압직류공제보호계통경건조건하실현.
Based on the theoretical research of the characteristics of different transient process occurred on ± 800 kV UHVDC lines, such as internal faults, external faults and lightning, a new protection scheme for UHVDC lines based on transient energy is proposed. The solution can identify an internal fault and its faulted circuit reliably based on the characteristics of low-frequency transient energy differential of the two ends of DC lines. Comprehensive simulation studies using PSCAD/EMTDC show that the proposed scheme is simple, reliable and practical. It not only provides correct responses under various fault conditions including high-resistance faults, but also is of immunity to lightning, electromagnetic coupling between positive and negative circuits, and commutation faults of converters, which satisfies the protection performance requirements for UHVDC lines. Furthermore, the hardware of existing HVDC control and protection systems is enough to support the implementation of the proposed scheme.