On April 15th, after a systematic review of scientific research and pilot experience of smart substations, the Ministry of Infrastructure of the State Grid Corporation of China formed the “Guidelines for Optimized Integrated Design and Construction of Smart Substations” and officially released it. The document of less than 2,500 words is complementary to the "Newly-Designed Substation Design Supplementary Regulations of 2011", which specifies the intelligent substation attribute positioning, technical route, and construction requirements, and highlights optimized resource allocation, information sharing, function integration, and device integration. The requirements for technological innovation, equipment innovation, etc., guide the construction of smart substations after they have entered the stage of comprehensive promotion.

Background: The smart substation will be transferred to the full-scale promotion stage 2011 is the first year for the company's smart grid to enter the comprehensive construction phase. As far as smart substations are concerned, it means that substation pilot construction will be transferred to a comprehensive promotion stage.

The reporter was informed that the "Supplementary Provisions" and "Guiding Opinions" were formulated based on the general design, "two-in-one", and life-cycle construction concepts and other standardized results, summarizing the achievements of the smart-change technology research and project pilot projects. “It can be said that it sums up the achievements of pilot construction of smart substations, which not only reflects the direction of technological advancement, but also realizes life-cycle cost savings,” said the company’s relevant person in the Ministry of Infrastructure.

As of April this year, in the company's 46 new smart substation pilot projects, there have been a 750 kV project, a 220 kV project, and three 110 kV projects completed. The five pilot projects with three different voltage levels use some of the same smart technologies. At the same time, according to the different voltage levels and project types, some corresponding intelligent functions have been added. These technologies are all valuable experiences accumulated in the construction of smart substations in China.

The 110 kV Jinnan substation is one of the three 110 kV smart conversion projects put into operation. According to the relevant personage of Hunan Provincial Electric Power Company, the whole station adopts the “three-tier equipment-one-layer network” substation automation system to implement common network transmission of multiple communication protocols. Another smart substation, the 220 kV Jiangsu Xigao substation, realizes multi-network and common-network transmission of multiple communication protocols at the station-level network to realize digital, network, and shared data transmission.

Positioning: The smart substation is the future of integrated and simple industrial facilities. What kind of construction ideas will the smart substation follow? The general design principles should be strictly implemented to highlight the functional orientation of industrial facilities. The smart substation is an industrial facility. This is the core concept of the “Guidance Opinion” and the basic function of the smart substation.

What is "industrial facility"? This facility is "safe, reliable, technologically advanced, and economical," and is a "two-in-one" principle. It is "saving materials, land, energy, and reducing operation and maintenance."

As an industrial facility, a smart substation must be simple, that is, stripping extra functions and integrating and integrating system functions. For example, substations originally set up a large area of ​​people's rest areas. With the improvement of the level of intelligence and the progress of unattended technology, these areas do not need to be reserved too much and may even be completely eliminated. This will reduce the footprint of the substation and reduce the building area inside the station.

Simplicity is to achieve functional integration without sacrificing the inherent performance of the device. For example, the 500-kv Fuyang Substation in Jiangsu Province reduced the number of secondary screen cabinets by more than 40 faces and reduced the building area by about 126 square meters through the use of optimization measures such as protection, monitoring, and control devices.

The realization of industrial facilities means simple but not simple, refined and not luxurious, which guarantees the realization of functions and saves overall investment. According to the requirements of industrialization, the Jiangsu 500kV Suiyang change carried out integrated optimization design, and the function was intelligent. There were only four single-storey buildings in the whole station, and the investment was about 460 million yuan, which was the same as that of conventional substations.

Methods: The need to strengthen functional integration, improve equipment integration, and strengthen technology guidance for “industrial facilities” has been placed in front of builders. How to achieve it? There are two ways to be highly valued: the integration and integration of substation functions and equipment, and the optimization and innovation of equipment manufacturers.

Enhancing the integration of functions and improving the integration of equipment refers to the characteristics of digitizing the data collection of intelligent substations, networking transmission processing, and information sharing. Under the premise of satisfying the reliability of the equipment, the hardware integration of the equipment is increased, the redundant functional devices are eliminated, and the device is reduced. The number of configurations.

"Supplementary Regulations" and "Guiding Opinions" put forward specific methods. For example, an intelligent terminal and merging unit in an interval can use an integrated device to implement hardware integration and reduce the number of process layer devices. The host at the control layer should integrate the functions of an operator station, an engineering station, and a protection and fault information substation to achieve information sharing. Integrate with functions to reduce the number of backstages.

Take the integrated power supply as an example. In ordinary substations, station AC power, DC power, communication power, and UPS power are separately arranged. The hardware is independent and the power room is set independently. According to the technical requirements of smart substations, they will be integrated together, unified design, and centralized arrangement to form an AC/DC integrated power supply system.

This requirement is not out of reach. Taking the 220-kilovolt Xiqiao Substation as an example, according to the introduction of relevant persons from Jiangsu Electric Power Company, the station adopts an integrated monitoring and control protection device, etc., which saves 6.7% of the floor space compared with the conventional scheme and saves 13.8% of the building area; The application realizes "the integration of primary equipment and primary equipment and the integration of primary equipment and secondary equipment".

For another example, the 110-kilovolt Jinnan intelligent system adopts a highly integrated integrated intelligent component that integrates the functions of protection, measurement and control, merging unit, and intelligent terminal. It supports multiple communication protocols for common-cable transmission, and integrates primary equipment design. Digital measurement, network control, visualization of status, and integration of functions have been realized.

The company also strengthened the technical guidance for equipment manufacturers. "This is conducive to guiding manufacturers to truly research and develop equipment in accordance with the technological development and demand of smart substations, reduce the low-level repeated investment by various manufacturers, and reduce detours," explained the relevant person in the company's Infrastructure Department.

For example, when the working reliability of the electronic transformer meets the requirements for combination installation, the AIS substation electronic transformer should adopt the combination of mutual inductor and AIS equipment to reduce the interval length of the distribution equipment to realize the saving of land; to strengthen the status monitoring IED The degree of integration of the device, reducing the number of device hardware.

According to the above general idea, at the end of June this year, the company will complete the general design of smart substations, form standardized templates and design drawings, and guide the follow-up smart transformation.

The construction of smart substations has come. In addition to the 41 smart substations under construction, more smart substations will stand on the vast land in the future. One day in the future, when you find that the smart substation in front of you is like today's ordinary substation, it is full of industrialized production. Please do not doubt it. That is precisely the embodiment of the company's industrialization of smart substations, and the embodiment of information sharing, technological innovation, and functional integration optimization. It ultimately enabled us to reap the fruits of “increased functionality and reduced costs” throughout the substation life cycle.