Optimal Economic Dispatching Approach of High-Voltage Electrode Boiler Combined with Coal-Fired Power Units to Participate in Frequency Regulation Service Based on Two-Stage Stochastic Programming

Abstract

In order to adapt the intermittency and volatility of renewable energy in power system, it is necessary to improve the frequency regulation ability of the existing large-scale coal-fired power units, which is significant to system stability and flexibility. Flexible energy facilities, such as high-voltage electrode boiler, can be integrated into coal-fired power units to participate in frequency regulation service. One of the key issues of the integrated scheme is how to dispatch high-voltage electrode boiler properly. To achieve it, this paper proposes an optimal economic scheduling approach for electrode boilers based on two-stage stochastic programming. Statistical characteristics of the AGC signal, the auxiliary service market rules and performances of different units are fully considered in the process. We finally determine the optimal operating base point and output of the electrode boiler in frequency regulation. Compared with the stochastic simulation using Monte Carlo approach, this approach is much less computationally heavy and easier to implement. A power plant case shows that the reasonable scheduling of the highvoltage electrode boiler using the proposed approach can realize the complementary advantages of different units, thereby efficiently improving the regulation performance and revenue.