针对风光并网会降低系统惯量、削弱系统调频能力的问题,综合考虑水电机组同步惯量、风电场和光伏电站的虚拟惯量和下垂控制作用,提出含风光水的多机系统动态频率响应模型,推导系统频率变化率约束、最低点频率偏差约束和准稳态频率偏差约束。基于此,为实现清洁能源利用最大化,以弃风、弃光、弃水最小及水库调度期末蓄能最大为目标,兼顾梯级水电、风电、光伏和发电系统的多种运行约束,构建风光水互补发电系统短期优化调度模型,并使用混合整数线性规划方法进行求解。最后通过算例仿真验证所提模型的有效性和适用性。
Abstract
In view of the problem that wind-solar grid integration will reduce the system inertia and weaken the system frequency regulation capability, considering the synchronous inertia of hydropower generators, the virtual inertia and droop control of wind farms and PV stations comprehensively, the dynamic frequency response model of multi-machine system with wind, solar and hydropower is proposed. The rate of change of frequency constraint, nadir frequency deviation constraint, as well as quasi-steady-state frequency deviation constraint, is deduced. Based on above, in order to maximize the utilization of clean energy, the goal is to minimize the amount of abandoned wind, solar and hydro power and maximize the stored energy of hydro stations at the end of the scheduling period. considering the multiple operational constraints of cascade hydropower, wind power, photovoltaics and the system, the short-term optimal scheduling model for the wind-solar-hydro coordinated generation system is constructed, and the mixed integer linear programming method is used to solve it. Finally, the simulation examples verify the validity and applicability of the proposed model.
关键词
虚拟惯量 /
下垂控制 /
频率响应 /
风光水互补发电 /
混合整数线性规划
Key words
virtual inertia /
droop control /
frequency response /
wind-solar-hydro coordinated generation /
mixed integer linear programming
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基金
国家重点研发计划（2019YFE0105200）; 国家自然科学基金（U1965104）
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