In the past year, Shandong Energy Supervision Office conducted several on-site inspections of local wind power and photovoltaic power plants, and requested related power stations to rectify the problems that were verified. After several months, 43 photovoltaic and wind power stations have major hidden dangers and have not been rectified. Shandong Electric Power Dispatching Control Center forced these new energy power stations to be disconnected from the grid and cut off the connection between the station and the dispatch data network. From the problem summary, the main problems of photovoltaic power plants are: physical isolation devices are not deployed between the station production control area and the management information area; the physical isolation and vertical encryption devices deployed in the station are not deployed or not enabled; The monitoring system, integrated automation system, optical power prediction system and other production systems have remote operation and maintenance; in the optical power prediction system, the security III area weather forecast server is directly connected to the Internet, and no firewall is deployed for access control and logical isolation; There is a loophole in the inter-area protection device that can be indirectly connected to the Internet.
System protection design principles for national grid operation:
a) Meet the requirements of the first-level safety and stability standards of the power system, ensured by the system's primary grid and relay protection device, as the first line of defense for stable operation of the system.
b) Meet the requirements of the second safety and stability standard of the power system, configure the cutting machine, load shedding control and other devices as the second line of defense for stable operation of the system.
c) Ensure the requirements of the third-level safety and stability standards of the power system, configure appropriate out-of-step disengagement and low-frequency, voltage-reducing devices and high-frequency cutting machines, fast-closing main valves, etc. The third line of defense that runs.
Since April 2017, the North China Energy Regulatory Bureau has organized a special supervision on the network security of new energy power generation enterprises in the northern part of the country. For the problems found in the supervision, the North China Bureau on May 4th against Hebei Longyuan Wind Power Co., Ltd. Three power companies, Guodian Power Hebei New Energy Development Co., Ltd. and Jingke Power Co., Ltd. conducted safety supervision interviews, and dispatched personnel from the dispatching center of Weibei Power Company. The interview mainly focused on five major network-related security issues, such as the maternal protection of the three new energy stations and the direct cross-regional visits of the I district II business, which were found in the network security inspections in the northern region.
All units of the power industry follow the overall strategy of “safety partitioning, network-specific, horizontal isolation, and vertical certificationâ€. Continuous work has been carried out, and a safety protection system covering the whole industry has been basically established, which effectively guarantees the safe operation of the critical information infrastructure such as the power monitoring system and the reliable supply of electricity.
In accordance with the requirements of the State Economic and Trade Commission [2002] No. 30, "Power Grid and Power Plant Computer Monitoring System and Dispatching Data Network Security Protection Regulations", and the State Electricity Regulatory Commission's Electricity Supervision Safety [2006] No. 34 "Overall Scheme for Power Secondary System Security Protection", The various information of power plants and substations are divided into four safety zones according to the overall scheme of secondary system safety protection, namely: real-time control zone I, non-control production zone II, production management zone III, and management information zone IV.
The National Energy Administration issued the National Security Comprehensive Safety [2016] No. 92 and Guoneng Comprehensive Safety [2016] No. 298 documents for the safety protection of power monitoring systems and the management of the network involved in the power grid, and launched a special inspection and grid connection for the safety protection of power monitoring systems. Power plant network security special inspection. The State Grid Dispatch Center subsequently issued a document to sign a supplementary clause for the grid-connected dispatching agreement (Tutorial [2016] No. 74). The new energy projects that have been investigated for safety hazards in Shandong Province were discovered during several inspections in 2016.
A clear and powerful intelligent operation and maintenance system can greatly reduce the work intensity of operation and maintenance personnel, improve operational efficiency, and reduce the occurrence of misuse. However, considering the security aspects of grid operation, we can determine the following problems:
1. The real-time control area I is a unique patent of the State Grid Corporation. It cannot be directly connected to the real-time control area I for the convenience of intelligent operation and maintenance.
2. If you want to facilitate the operation and maintenance, you can access other safety zones, but you must meet the requirements of relevant national standards and national energy authorities and power grid companies.
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