This project belongs to the electrical direction in the field of advanced energy.
In recent years, in response to the implementation of the national energy conservation and emission reduction strategy and the transformation of energy consumption models, in order to actively absorb large-scale clean energy from hydropower in southwest China, the proportion of power receiving in Shanghai Power Grid has increased significantly, and internal start-up has been greatly reduced. The power grid has entered the new normal of "strong feed and weak start-up." The development and operation of the power grid have undergone profound changes. Contradictions between clean energy consumption and power grid security and stability, between clean energy evacuation and equipment transmission capacity, and between clean energy reception and power supply support are prominent.
In response to this rare power grid operating state at home and abroad, based on power grid security and with the consumption of large-scale clean energy as the core, this project has built a "strong feed and weak start-up" technology for the first time covering power grid operation, equipment operation, and power supply operation. The support system focuses on solving the minimum start-up arrangement problem that integrates multiple safety and stability factors, the problem of cable capacity expansion and substation capacity expansion after large-scale changes in the current evacuation mode, and the problem of improving power supply support capabilities under weak start-up. The technical innovations of the project are as follows:
(1) A grid minimum start-up mode arrangement strategy and evaluation method that integrates multiple safety and stability factors such as power balance, peak shaving balance, power flow analysis, and voltage stability is proposed. It can effectively determine the critical start-up mode in large-scale clean energy consumption., to achieve the coordination of clean energy consumption and power grid security and stability.
(2) A quasi-dynamic cable capacity increase method is proposed. A quasi-steady-state cable heat conduction model under complex cable layout is established based on the actual cable channel structure, and the model parameters are dynamically updated based on real-time data of temperature and load, breaking through large-scale clean energy. The technical bottleneck of cable section transmission is blocked in the consumption of urban power grids.
(3) A dynamic correction method for the thermal circuit model of substation equipment is proposed. At the same time, the thermal circuit correction model is used to develop a real-time dynamic capacity increase system for substation equipment to tap the available load capacity of substation equipment and break through large-scale clean energy consumption. Technical bottleneck of blocked substation.
(4) An intelligent control system has been developed to coordinate the outlet temperature of the unit separator with the primary and secondary desuperheating water, which effectively improves the peak shaving and frequency modulation performance of the unit and ensures the regulation of the power grid after large-scale clean energy consumption. Quality.
The project has mastered the core technologies of "strong feed and weak start-up" power grid operation, equipment operation, and power supply operation, developed relevant models, methods and software systems, applied for 6 invention patents, authorized 8 utility model patents, and 1 software copyright., Published 19 core journal papers.
The research results of the project have been successfully implemented in the operation control and development plan of Shanghai Power Grid. Through support for large-scale hydropower consumption in Southwest China, Shanghai's standard coal consumption can be reduced by 2.59368 million tons, carbon dioxide emissions can be reduced by 9.8039 million tons, and the power grid purchase cost is reduced. 1.4966 billion yuan; In 2014, Shanghai's standard coal consumption will be reduced by 3.58752 million tons, carbon dioxide emissions will be reduced by 13.5606 million tons, and the power grid purchase cost will be reduced by 2.07 billion yuan. Significant social and economic benefits have been achieved, promoting the implementation of Shanghai's energy conservation and emission reduction strategy and promoting the transformation of Shanghai's energy consumption model.