考虑电解水与甲烷化运行特性的电转气系统日前调度方法

电转气(P2G)系统通过直接利用新能源盈余电量合成天然气缓解弃风、弃光问题。现有忽略P2G系统内部的电解水环节和甲烷化环节运行状态的调度结果与实际情况偏差较大。为解决该问题,提出一种精细化的P2G系统日前调度方法。电解水模型考虑了产氢流量与耗电功率的非线性关系,甲烷化模型计及了启停过程多状态转换耗时耗能特性,调度模型还体现了储氢装置在电解水与甲烷化环节间的调节作用。考虑电解水与甲烷化运行特性的日前调度方法能够有效反映P2G系统的实际运行情况,实现对P2G系统的高效利用。仿真结果验证了所提方法的有效性。

Day-ahead Scheduling Method of Power-to-gas System Considering Operation Characteristics of Water Electrolysis and Methanation

Power-to-gas(P2G)system mitigates the curtailment of wind and photovoltaic power by using surplus electricity of renewable energy. The scheduling results of existing methods which ignore the operation states of the water electrolysis and methanation units in the P2G system are greatly deviated from the actual situation. In order to solve the problem, a refined day-ahead scheduling method for P2G system is proposed. The proposed method considers the nonlinear relationship between flow rate of hydrogen production and power consumption in the model of water electrolysis. Besides, the time and energy consumption characteristics of multi-state transition in start-stop process are included in the methanation model. In addition, the scheduling model takes the regulation effect of hydrogen storage device between water electrolysis and methanation unit into account. The day-ahead scheduling method considering the operation characteristics of water electrolysis and methanation can effectively reflect the actual operation of P2G system and realize the efficient utilization of P2G system. Simulation results demonstrate the effectiveness of the proposed method.