Research on Interactive Control of Electrolytic Aluminum Load and Wind Power Output

Abstract

Abstract.With the large-scale wind power generation connected to Gansu power grid, electrolytic aluminium load has reached a certain scale at the same time, the vast majority of electrolytic aluminium load directly connects to power grid using 330kV transmission line. According to the physical characteristics and historical data, the continuous adjustment characteristic of electrolytic aluminium load is analysed. Based on this characteristic, a mathematical model for the electrolytic aluminium load is established. Aiming at reducing power network loss and wind power consumption, an optimization model based on the load regulation characteristics of electrolytic aluminium is constructed, which is optimized by particle swarm optimization algorithm. Based on the case data of Gansu power grid, the optimal method based on the load regulation characteristics of electrolytic aluminium is analysed and its feasibility is verified. InstructionGansu Province has lots of wind energy resources [1] which are mainly concentrated in Jiayuguan and Jiuquan area, and are away from the province's electricity load center. Further more, lots of wind power can not be consumed since the wind power consumptive ability in Jiayuguan and Jiuquan areas is very limited [2]. The wind power could be transmitted to the main power grid of Gansu province through double circuit 750kV transmission line in Jiuquan Hexi. However, remote delivery of large-scale active power increases the loss of power system and also reduces the voltage quality of Hexi power grid and the main power grid of Gansu province, which increase the network loss value more. In addition, due to the reverse distribution characteristic of the new energy and conventional generations [3], the power loss is huge when conventional generations are adjustable. The randomness and volatility of the new energy sources [4] may lead to a large voltage fluctuation of the transmission line, which further increase the power loss [5]. To solve this problem, paper [6] reduces the randomness of new energy output by using the coupling of different new energy sources, but it does not solve the problem of large-scale new energy consumption. Aiming at consuming the new energy, paper [7] achieves dynamic economic dispatch by optimizing the power of conventional thermal power generating units, which makes all the wind power output be consumed by power grid. However, sometimes only by coordinating with conventional power supply, the new energy output cannot be completely consumed. Paper [8] uses spot price to stimulate demand side resources to consume the wind generation output, but the analysis of demand side resources is not detailed enough.Electrolytic aluminium industry [9][10] in Gansu Province are one of the most important industries, which has large capacity and regulation characteristic, usually use 330/750kV high voltage to supply the power directly. Based on the regulation characteristics of electrolytic aluminium load, the load cooperates with the new energy to consume as much new energy as p...