特高压直流控保系统网络风暴造成主机死机机理分析及网络测试方法研究

Analysis on Mechanism of Network Failure Caused by Network Storm in UHVDC Control and Protection System and Research on Network Testing Scheme

摘要:

基于特高压直流输电工程实际发生的由于控制保护系统网络风暴引发主机死机的事件，分析了相关机理，提 出了造成主机死机的 3 个条件，并给出了事件发生原因，分析表明现有特高压直流控制保护系统中，主机网络报文筛 查检测功能不完善，在出现长报文自锁时不能及时提醒 CPU 采取应对措施的严重缺陷。因此，在保护主机中增加了 对超长报文的筛查检测功能，当信息子站与控制保护系统之间的报文超过 255 字节后，控保主机系统选择不进行接 收。同时，为了验证网络性能及分析相关事故，提出了特高压换流站控制保护系统网络测试方案。实际事件分析体现 了分析的正确性。

Abstract:

According to the actual network failure caused by network storm in UHVDC control and protection system，the relevant mechanism is analyzed，three conditions are put forward to host crashes，and the causes of the accident are given，which ultimately leads to the DC bipolar blocking event． Through the system simulation analysis of the blocking event，it is found that the DCC800 host network packet screening detection function is not perfect，in the emergence of long packets of self lock it cannot be timely remind CPU to take measures to deal with serious defects． Therefore，in the protection of the host the length of the packet screening detection function is added，when the message is more than 255 bytes between the station and the control protection system，the host computer control system selects not to receive． At the same time，in order to verify the performance of the network and analyze the related accidents，the network testing schemes for the control and protection system of UHVDC converter station are proposed． The analysis of actual event shows the correctness of the analysis．