Abstract
The paper conducts an in-depth study on the real-time dispatching involved in joint operation among giant cascade hydropower stations with high-intensity peak-load and frequency regulation demand, and proposes anintelligent load control technology for cascade hydropower stations in the coordination mode of station and power grid. Aiming to water level safety control of runoff power stations and rapid response to load regulation requirements of the power grid, taking 10 types of constraints such as output, water volume and flow rate into consideration, a model cluster is established through the layered control principle to realize real-time intelligent load allocation and economic operation among Pubugou, Shenxigou and Zhentouba stations. Dadu River has become the first large-scale river basin in China to realize “one-key dispatch” of multiple stations, and has achieved good demonstration effect.
Highlights
Clean energy is abundant in Sichuan province
In view of the high-intensity peak-load and frequency regulation demand due tothe characteristics of Sichuan power grid, this paper proposes a kind of intelligent load control method for cascade hydropower stations aiming atcoordination of stations and power grid, and realizes the real-time intelligent load distribution and economic operation among cascades of Pubugou, Shenxigou and Zhentouba stations on the basis of fast respond to power grid demand
5 units are in operation in Pubugou station withno model to regulate the total loadto dead zone of the target vibration zone as a whole andwater level 825.7m; 4 units load, later it will transfer automatically to maximum are in operationin Shenxigoustation, the vibration zonein energy conservationmode, reducing the load value of the whole plant is 20 ~ 85MW with water level 657m; 3 Pubugou at a constant speed while increasingthe load of units are in opreation in Zhentouba station with vibration Shenxigou and Zhentouba Station at the same speed, in area 15~90MW as a whole and water level 621m. order to store more water in reservoir of Pubugou
Summary
Clean energy is abundant in Sichuan province. By the end of 2017, the total installed capacity based on clean energy has reached 83,730,000kW in Sichuan, accounting for 86.1% of the total installed capacity of Sichuan province. Because of the smallthe reservoir capacity of Shenxigou and Zhentouba stations, theirwater levelsare affected greatly by load of the upstream Pubugou.Traditional station AGC,whichcan not control water levels harmoniously and economically, has to be suspended, only passively accepting "fixed load"commandsissued bypower grid conctrol center, resulting in large fluctuations in water levels, abandoned water , reservoir draining-outof the two reservoirs, etc., seriously affecting the safe and economic operation of cascade power stations. In view of the high-intensity peak-load and frequency regulation demand due tothe characteristics of Sichuan power grid, this paper proposes a kind of intelligent load control method for cascade hydropower stations aiming atcoordination of stations and power grid, and realizes the real-time intelligent load distribution and economic operation among cascades of Pubugou, Shenxigou and Zhentouba stations on the basis of fast respond to power grid demand
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