The power grid simulation technology began to continuously output to the outside world. On June 15th, China Southern Power Grid Research Institute and the Brazilian State Power Dispatching Center (ONS) formally signed the "Multi-DC Feed-in System Simulation Analysis Technical Consultation" cooperation agreement. According to the agreement, China Southern Power Grid will conduct a one-year HVDC transmission training for ONS. This will be followed by real-time simulation technology training and exchanges with technical personnel of the Korea Electric Power Institute, and will once again undertake international business by directly signing foreign-related contracts, which fully demonstrates the international influence of China's power grid simulation technology.
Luis Bharata, president of Brazil's National Electric Power Dispatch Center, said that Brazil’s power grid and the South Grid’s grid structure are similar and both need to build long-distance and direct-current projects to connect the sending end and the receiving end. The South China Power Grid is very experienced in DC operation. I hope In the future, China Southern Power Grid can share its HVDC transmission experience and make progress together. According to reports, HVDC transmission technology is widely used in Brazil's power grid. It is expected that by 2024, Brazil will form a 8-10 dc centralized settlement site in Rio and the southeastern region of the São Paulo region. Its grid characteristics are very similar to those of the South China Power Grid. There are features such as AC-DC parallel operation and DC multi-infeed that face technical challenges in system operation, simulation analysis, and security prevention and control.
At present, China Southern Power Grid has formed eight channels of eighteen straight and ten straight routes from West to East, sending more than 47.5 million kilowatts of electricity. The main grid uses hybrid AC and DC operations and has become one of the most complex grids in the world. After years of in-depth research and analysis, China Southern Power Grid has formed the world's most advanced and most complete HVDC transmission technology and AC-DC complex large-scale power grid operation analysis technology, creating a number of world firsts.
Extended reading:
Large grid simulation technology
A schematic diagram of AC/DC real-time simulation platform covering 20 DC systems
“At present, power system development planning and operation control in the world are all using the same simulation technology and software for calculation and analysis. Major engineering practices in the development process in China, such as the Three Gorges Power Transmission and Transformation Project, the South China Power Grid’s West Power Transmission Project, and other power grids The daily dispatching operation proves that the simulation is effective and reliable.†On September 8, Li Limiao, academician of the Chinese Academy of Engineering and chairman of the expert committee of China Southern Power Grid Corporation, pointed out in the “International Symposium on AC-DC Large Power Grid Simulation Technologyâ€, pointing out the The main purpose.
It is reported that in order to promote the advanced simulation technology of international AC/DC large-scale power grids and the exchange and development of application and application, and to solve the key problems of the simulation test and operation analysis of HVDC transmission projects in large AC/DC power grids, Nanfang Research Institute specially held an international seminar. The meeting invited experts from the Chinese Academy of Engineering Li Limg, Xue Yusheng, Han Yingyu, experts from Korea and Canada's power systems, experts from Siemens, ABB, Alstom, Narirui Bao, Xu Ji, Sifang and other major electrical equipment manufacturers at home and abroad. Experts from China Electric Power Research Institute and South China Research Institute participated.
South Network special simulation system
The power grid simulation has evolved from handwriting calculations at the very beginning to development of computer-based digital simulation using PSASP and comprehensive programs as the symbol, and physical modeling-based dynamic simulation to the large-scale digital-analog hybrid simulation and digital system. Ultra-real-time simulation.
Surprisingly, the grid simulation lab of the South China Network Research Institute looks more like an information center. It does not see any racks or equipment models, only computing equipment and display screens.
It turned out that as early as 2004, a team of experts such as Academician Li Limg passed domestic and international research and suggested that the company develop a simulation platform. However, there are many kinds of power grid simulation technologies. The power grids of Russia, South Korea, and Canada have adopted different methods according to their own conditions. According to the expert group's demonstration, it is believed that the research and development of the simulation technology of the South Network started later, and may not have advantages in the traditional simulation. It is recommended to develop digital simulation. As a result, the company invested in the establishment of a power grid simulation laboratory.
Rao Hong, dean of the South China Research Institute, said that in April 2013, China Southern Power Grid’s real-time simulation platform passed the appraisal. This scale covers 220 kV and above AC/DC interconnected systems in five southern provinces, also known as the mirror system of the power grid. The world's most complex real-time simulation system for AC-DC parallel power grids contains over 1100 AC nodes, 250 generators, and 140 million kilowatts of load capacity, which can affect AC and DC interactions and dynamics of the “eight-transit and eight-straight†transmission channel of China Southern Power Grid. The detailed simulation of the process has played an important role in the analysis of major power grid risks, decision support, quasi-deterministic and quantitative analysis of AC/DC operational faults, DC project testing, commissioning, and software management. It has become the design, operation, and anti-accident of China Southern Power Grid. Measures are backed by high technology.
"Needs better simulation system"
China Southern Power Grid Corporation has developed from "two crosses and two straights" in 2003 to today's "eight-to-eight and eight-straight". After more than ten years of development, the scale of the Western Power Transmission from the west to the east of the China Southern Power Grid has grown from small to large, and the parallel AC-DC parallel technology system has gradually improved: The AC/DC parallel power grid stability control technology has basically taken shape. By 2011, the AC/DC power grid on-line integrated defense system will be put into operation, and will be the first multi-terminal 100-volt-volt-class STATCOM in Dongguan and the world's first multi-terminal flexible DC transmission system in 2013.
The reporter learned from the seminar that DC transmission is a major means of large-capacity long-distance transmission of electricity. China is a major country of DC transmission, and in the past 10 years, the world’s DC transmission power has reached 150 GW, and the number of commissioning projects for China’s DC transmission projects is The cumulative capacity ranks first in the world, and 25 DC projects have been put into operation (21 conventional DCs and 4 flexible DCs), accounting for 10% of the world's capacity.
Guo Qi, deputy director of the Institute of Simulation and Control Technology at the South China Research Institute of Technology, said: “The modern grid is the most complex man-made system. It cannot be understood and mastered by experience. It can only be verified.†Therefore, in the face of complex Large power grid, without a lot of intensive
Simulation calculation is difficult to grasp its development rules and operating characteristics. "We need a better simulation platform."
Power grid development puts new demands on simulation technology
It is understood that this conference mainly focuses on the simulation methods and new technologies for the (special) HVDC and flexible HVDC transmission systems in AC-DC large grid interconnection systems, and discusses the traditional DC and flexible systems adapted to AC-DC large grid systems. Discussions on the technical aspects of simulation and key application schemes for DC test and operation analysis.
“Single fault may cause multi-circuit DC commutation failure at the same time, resulting in a new type of fault, cross-section overload and stability issues.†At the seminar, Tian Fang, deputy director of the Institute of Systems, China Electric Power Research Institute, received power from the receiving grid and the sending end. The power grid and other aspects introduced the new operating characteristics of large-scale AC-DC hybrid power grids, and analyzed the new demands put forward by the development of power grids on simulation technology.
During his speech titled “AC-DC Large Power Grid Simulation Technology and Applicationâ€, Rao Hong introduced the development planning of the 2030 vision and simulation platform for DC transmission in China Southern Power Grid. He proposed the simulation technology route—electromagnetic transient-electromechanical transient mixture. That is, "RTDS + parallel computer" cross-platform real-time simulation. It is reported that the technology has achieved cross-platform hybrid simulation of AC and DC power grids of 110 kilovolts and above. At the same time, it has developed a scalable full-sequence, high-precision, and digital hybrid simulation interface.
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