Abstract
At present, the problem of abandoning wind and PV power in “Three North” region of China is particularly significant, and how to alleviate this problem has become the focus of universal attention. Calculation of renewable energy accommodation capacity is the basis to solve the problem of abandoning wind and PV power. Main problems of Chinese renewable energy accommodation is analyzed from power supply, power grid and load side aspects, and it focuses on the effect of inter-provincial tie-line to renewable energy accommodation capacity. At present, the inter-provincial tie-line utilization level is limited, which affected renewable energy accommodation to a certain extent. Based on the sequential production simulation model, a new kind of renewable energy accommodation capacity model is put forward considering the utilization level of inter-provincial tie-line. According to different system stability constraints and different electricity constraints of inter-provincial tie-line, 4 schemes are designed for comparative analysis, and the evaluation model is used to calculate renewable energy accommodation capacity of “Three North” region of China in 2020. Example analysis results verify validity of the model that releasing curve constraints, electricity constraints and stability constraints in turn can significantly enhance renewable energy accommodation capacity through effective use of inter-provincial tie-line transmission capacity. Research work in this paper can provide strong support for the planning and scheduling control of power grid.
Highlights
By the end of 2017, installed capacity of China’s power generation has exceeded 1.77 billion kilowatts
3.1 Basis of capacity calculation This paper presents a renewable energy accommodation capacity calculation model considering utilization level of inter-provincial and inter-regional tie-lines, which is based on renewable energy time series production simulation [20]
4.5 Comprehensive analysis The results show that of renewable energy accommodation capacity in Northwest, Northeast and North China has been greatly increased, and renewable energy accommodation capacity has been greatly increased after fully considering exchange capacity of inter-provincial and inter-regional transmission passages and enhancing their utilization level, including curve constraint, electricity constraint and stability constraint
Summary
By the end of 2017, installed capacity of China’s power generation has exceeded 1.77 billion kilowatts. References [11, 12] study day-ahead assessment model of renewable energy accommodation capacity considering SCED model This method is helpful to improve effectiveness and practicability of power grid dispatch planning. The assessment of renewable energy accommodation capacity on day-ahead and intraday time scale further enriches the assessment connotation, but relevant methods basically concentrate on provincial power grid, and do not fully consider the utilization level of inter-provincial and inter-regional tie-lines. Reference [17] studies and analyzes assessment model of wind power accommodation capacity of inter-regional power grid, and puts forward relevant measures to improve accommodation capacity. Aiming at the practical engineering problem of abandoning wind and PV in the “three north” area of China, this paper presents a new calculation model of renewable energy accommodation capacity on the basis of time series production simulation model. Expanding load scale has become an effective means to enhance renewable energy accommodation capacity, especially in the areas with high proportion of renewable energy
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