模糊控制优化下的混合储能系统辅助燃煤机组调频仿真

Hybrid energy storage system assisted frequency modulation simulation of the coal-fired unit under fuzzy control optimization

在新能源并网容量日益增多的背景下,提高燃煤火电机组的调频能力是满足目前电网新能源消纳调频需求的主要途径之一。对此,利用由飞轮储能与电化学储能组成的混合储能系统辅助火电机组提高调频性能是重要的技术手段。本工作针对600 MW供热机组,在Matlab/Simulink中构建混合储能系统辅助燃煤火电机组调频的仿真模型,并对提出的控制策略进行仿真验证。结果表明,机组耦合混合储能系统能有效减少电网频率变化量,降低汽轮机输出功率波动,稳定主蒸汽压力;针对混合储能系统中的功率分配系数,利用模糊控制策略进行优化,发现模糊控制策略能够在连续的充/放过程中,使混合储能系统保持良好的功率变化适应性。

Improved frequency modulation capacity of coal-fired thermal power units is one of the key strategies to fulfill the present frequency modulation demand of new energy in the power grid,in the context of rising grid-connected capacity of new energy.Consequently,the hybrid energy storage system composed of flywheel energy storage and electrochemical energy storage is an important technical means to enhance the frequency modulation performance of thermal power units.In Matlab/Simulink,a simulation model of a hybrid energy storage system to aid frequency modulation of coal-fired thermal power units is created,with the suggested control method confirmed and simulated for a 600 MW heat supply unit.The results demonstrate that the coupling hybrid energy storage system can effectively reduce the frequency variation of the power grid,reduce the output power fluctuation of the turbine,and stabilize the main steam pressure.The fuzzy control approach is utilized to optimize the power distribution coefficient in the hybrid energy storage system.The findings demonstrate that the fuzzy control method can keep the continuous charging/discharging process adaptable to power variations.