Controlling voltage in complex grids is no longer "complicated" Tsinghua University, Professor Sun Hongbin team capture complex automatic control of power grids key technologies On January 15, 2016, the appraisal of the achievement of "The Key Technology and Application of Complicated Grid Autotransmission-Cooperative Reactive Power Voltage Automatic Control System" completed by Professor Sun Hongbin from the Department of Electrical Engineering of Tsinghua University was held in Tsinghua University. After discussion and appraisal committee experts agreed that the project has made significant original research results, as a whole reached the international advanced level, led the power system voltage control in the field of development and technological progress, agreed to pass the appraisal. Experts said that the achievements of the project have been popularized and applied in most of the provincial grids and large-scale renewable energy bases in our country and achieved great socio-economic benefits in the safe operation of power grids, energy conservation and emission reduction, and large-scale renewable energy sources. benefit. The project achievements have been successfully applied to PJM, the largest regional power grid in North America, filling the gap of North American applications in this field. This is the milestone of the first large-scale power grid control system in North America exported to North America for the first time. "Complex grid self-discipline - Cooperative reactive voltage automatic control system key technology and application" Results identification will be held at Tsinghua University "Complex Grid Self-Regulation - Key Technology and Application of Cooperative Reactive Power Voltage Automatic Control System" The project has over 20 years of research and development to overcome the automatic control of reactive power voltage from a single control center to a multi-level control center, from the conventional power grid to renewable energy access grid , A series of key technical problems in the application from China Power Grid to North American power grid, the technical system and standards for self-regulated coordinated voltage control of complex power grids are constructed, and a reactive power voltage automatic control system with completely independent intellectual property rights is developed. The project has experienced 14 national-level topics, applied for nearly 90 invention patents, published more than 200 papers, and invited more than 20 foreign special reports. Let voltage control move from manual to automatic Modern life has been inseparable from electricity, for the user, the quality of electricity is how one of the key is the quality of the voltage. For the power system, the load is constantly changing, and the occurrence of the fault is hard to avoid. To maintain the safety and quality of the system voltage, it needs to be adjusted in real time. The voltage safety directly affects the safety of the power grid. The quality of the voltage determines the quality of the power. "Especially in economically developed and heavily charged areas, where electricity is transported from afar, it is easy to create a depression of voltage like a pit into a waterfall." Sun Hongbin, Professor of Electrical Engineering, Tsinghua University "This kind of depression area is very prone to a chain reaction if it encounters a sudden failure, just like a domino," which caused a large-scale power outage. "In the past two decades, all the major blackouts in the world have reflected For the network of such an extremely complex network system, the voltage safety is a worldwide problem. To ensure the safe operation of the power grid, it is necessary to control the voltage of the power grid in real time. In the past, our country adopted a method of relying on artificial and decentralized control. At all levels of the power grid control centers and power plants, substations and other places, there are 24 hours on duty dispatchers, they are always staring at the grid voltage situation, once the problem is found, it will step by step call to ask the appropriate units Adjustment. This method not only consumes tremendous manpower, depends on the experience of dispatchers, but also often results in the fact that operators are confined to local information only in actual operation, and can not effectively coordinate from the point of view of the overall benefit of the whole power grid. Therefore, real-time acquisition of grid data analysis, the use of effective algorithms to form a decision, and all kinds of reactive power control equipment in the grid to coordinate control so that the entire power grid at the best voltage at all times to protect the grid operation The safety and economy have become increasingly urgent demands for grid operation. The way to achieve this goal is automatic voltage control system, which together with the automatic generation control system constitutes the two major core of modern grid system-level automatic control. However, the implementation of system-level automatic voltage control in complex power systems is a major challenge. On the one hand, the control objects are complex. Especially in recent years, large-scale intermittent renewable energy sources are fed into the already extremely complex large-scale power grids, further triggering The new problem; the second is the control model is complex, China's interconnected power grids are spatially distributed multi-level control center scheduling, grid interconnection and control distribution, how to coordinate the problem; the third is the mathematical complexity, which is A mixed integer dynamic programming problem with large-scale and complex constraints has its own difficulty to solve. "In order to cope with this complexity, we adopted a 'self-discipline + synergistic' technology route," Sun Hongbin said. "Controlling objects is complex. We divide them into different groups according to their characteristics, , But can not let each part of their own way, and then through the method to bring everyone together, trying to make one, to achieve the overall goal of the best. Similarly, in order to cope with the complexity of the control model, we combine the requirements of the first division of labor And then through the mutual control of two-way information between the control center interaction, so that located in different cities of the control center to work together to enable the power grid in a wider range of optimal voltage distribution.And complex safety and economy multi-objective optimization problem First, it decomposes itself into a relatively simplified self-discipline solution to the two sub-problems, safety and economy, and then reconciles the two through a cooperative game. " Sun Hongbin finally described the technical route image as a seesaw. "On the one hand, it is self-discipline, while on the other hand, it is synergy. Through self-discipline, control is simplified, reliable and agile. Through synergy, the goal is the same and the overall situation is optimal. What we do is how Find that subtle balance between discipline and collaboration. " In the 1980s, France first introduced an automatic voltage control system in the world, but the technology was not directly available domestically. One of the most crucial is that the development of China's power grid is very rapid. In the new century, the installed capacity of China's power grid will be equivalent to that of the United Kingdom in a decade. In France, the automatic voltage control technology is a solidified control System, unable to adapt to this rapid change in China's power grid. In 1995, Sun Hongbin, a doctoral student, started his research in the field under the guidance of Professor Xiang Niande and Professor Zhang Boming. He participated in the national 85 scientific and technological project "Research on global quasi-steady state voltage optimization closed-loop control of power system and Demonstration Project "research, began 20 years in this area tirelessly search. Aiming at the problem that the automatic voltage control system in France is hard to solve, Sun Hongbin's team is devoted to making the control system have a certain adaptive characteristic, making the control mode and method of the system change following the change of the power grid, becoming flexible, Strain control mode of the system, but also consider the potential of the grid failure, the system's control strategy to automatically respond. In 2002, Sun Hongbin was found to be in need of automatic voltage control system in Jiangsu Power Grid, hoping to carry out cooperation. Prior to this, Jiangsu Power Grid had also been looking for other companies, but because of the system development and operation of the difficulty and great responsibility without reaching a cooperation. However, with his accumulated courage and fear of failure, Sun Hongbin accepted the challenge without hesitation and deeply integrated theoretical research with engineering practice. In the first closed-loop test carried out in Jiangsu Power Grid, at that time, he was still a member of a doctoral dissertation group. Guo Qinglai, an associate professor of electrical engineering, did not dare to leave in the engine room for 72 hours. "What I used to do is theoretical analysis and simulation test, this is a real engineering application, the pressure is very large, can only be staring at the control curves and effects in the field." Guo Qing said, "But when you really see the control commands sent to The actual grid system, the device according to the expected strategy Metal Welding Parts,Surface,Treatment and Testing,Customization Size Figure Changzhou Fuku Precision Machinery Co., Ltd. , https://www.fukuindustrial.com
China's first large-scale power grid control system for the first time in North America