高压直流保护新方案研究

Study on New Protection Scheme of HVDC Transmission Lines

高性能的直流线路保护方案对于保证高压直流输电系统的安全可靠运行具有重大意义。传统直流线路保护方案在理论完备性、可靠性、动作快速性等方面存在不足,且线路故障引起的极闭锁事故时有发生。为克服传统方案的不足,文章根据4种新型保护原理,构成新的线路保护方案。此方案不受直流长线分布参数的影响,采样率低,能覆盖故障全过程,并且能够解决高阻接地引起极闭锁事故的问题。理论分析及仿真验证都表明,该新型高压直流输电线路保护方案的性能优于传统线路保护方案。

The high-performance DC line protection scheme is of great significance to ensure the safe and reliable operation of HVDC transmission systems. However, The traditional DC line protection schemes have many defects, such as incomplete in theory, poor in reliability, fast protection does not respond to high resistance faults and slow in differential protection, In order to overcome the shortcomings of traditional schemes, four kinds of new protection principles are selected to form a new line protection scheme. The new HVDC line protection scheme is not affected by DC long-distance distribution parameters, the sampling rate is low, can cover the entire process of failure, and can solve the problem of high-resistance ground caused by a very latch-up accident. Theoretical analysis and simulation results show that the new HVDC transmission line protection scheme is better than the traditional scheme..