Long-term joint peak regulation dispatching method for trans-provincial interconnected hydropower stations

Abstract

The invention relates to the field of hydropower generation and dispatching, and discloses a long-term joint peak regulation dispatching method for trans-provincial interconnected hydropower stations. The technical scheme is as follows: a multi-objective optimization model of hydropower stations is set up with the goal of maximizing the amount of power generation and minimizing the peak-valley ratio of a typical day in the dry season, by the use of trans-provincial and trans-regional interbasin hydrological characteristics and the regulation performance difference among power supplies, the power stations are grouped according to an output interval of each power station and the calculation sequence of the power stations is coordinated by stages; and the optimal water level process of sending and receiving end hydropower stations is optimized by using a step by step optimization and dynamic planning successive approximation coupling algorithm and a sending end faced load is reconstructed according to transmission restriction constraints of a trans-provincial DC tie line, the output process of the typical day is determined by a successive load shedding strategy, and a long-term power distribution scheme of the hydropower stations and the electric power process of the typical day in each month are obtained through iterative optimization. The method of the invention can make full use of compensating regulation characteristics of the sending and receiving end hydropower stations, effectively responds to the long-term power demand of a power grid and the short-term peak regulation demand, and meets the actual needs of the trans-provincial and trans-regional dispatching of a giant hydropower station.

Description

technical field [0001] The invention relates to the field of dispatching of hydropower generation, in particular to a method for long-term joint peak-shaving dispatching of inter-provincial interconnected hydropower station groups. Background technique [0002] With the grid-connected power generation of giant hydropower stations in the Jinsha River, Yalong River, and Lancang River Basin, the scale of my country's inter-provincial hydropower transmission has expanded rapidly, and the maximum transportable capacity has exceeded 68 million kW. The influence of the network has increased significantly, and it has formed a very complex inter-provincial interconnected hydropower system with the hydropower in the receiving area to meet the complex task requirements such as power supply and load regulation of the receiving end grid, and bring new technologies to the dispatching management of the receiving end grid. challenges and problems. On the one hand, these hydropower station gr...

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Problems solved by technology

[0003] Research on inter-provincial and inter-regional hydropower dispatching has received more attention as the scale of UHVDC hydropower transmission continues to increase. Some studies focus on cascaded inter-provincial power transmission in a single river basin, such as power transmission from the main stream of the Hongshui River to Guangdong, Guangxi, and Jinsha. Guangdong and Zhejiang, etc., carried out short-term inter-provincial peak shaving methods for hydropower transmission in the lower reaches of the Yangtze River; another individual study focused on the power distribution of DC hydropower among multiple provincial power grids in the receiving area, and carried out two-level short-term coordination between grid and province. Research on peak-shaving methods. These research reports mainly focus on the grid-provincial coordination of DC hydropower in the receiving area or the inter-provincial short-term peak-shaving scheduling of a single river basin cascade. Involving long-term and short-term multi-time scale coupling complex scheduling requirements, this problem is the technical bottleneck faced by my country's large-scale hydropower transmission configuration, and applicable theoretical methods and technologies are urgently needed

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