含低负荷场景低碳多源协调调度

温室效应导致全球持续升温,巨大碳排放量导致地球已不堪重负,如何降低碳排放成为目前亟待解决的问题。当风电出力与火电机组最小出力之和大于负荷量,只能通过储能、储热装置或弃风来达到功率平衡,此时可定义为低负荷运行状态。在低负荷时段,负荷消纳风电难、储能成本运行高。首先,考虑火电机组深调对发电成本和碳排放量的影响,建立了火电机组分阶段出力模型,将碳交易机制引入系统的调度模型中,构建阶梯型碳交易成本的计算模型;其次,以碳排放量和发电成本最小为优化目标,综合考虑系统的各种约束条件,建立了基于多目标的含低负荷场景低碳多源协调调度模型;然后,采用改进萤火虫算法,得到最优调度方案;最后,以带10个风电场的系统为算例,采用3种不同对比实验证明,所提方法可有效降低碳排放量,提高了系统运行经济性。所提方法分析了风电并网渗透率对系统运行方式的影响,表明含低负荷场景低碳多源协调调度与风电并网渗透率密切相关。

Low carbon multi source coordinated dispatch in the low load scenario

Greenhouse effect results in the global warming, and huge carbon emissions make the earth overwhelmed. How to reduce carbon emissions has become an urgent problem to be addressed. When the sum of wind power output and thermal power unit minimum output is larger than the load, the power balance can only be achieved through energy storage, heat storage device or abandoned wind. It can be defined as low load operating condition. During the low load period, it is difficult to absorb wind power and high energy storage cost. Firstly, the influence of deep regulation of thermal power units on generation cost and carbon emissions is considered. In this way, a stage output model of thermal power components is formulated. Carbon trading mechanism is introduced into the dispatching model of the system, and a step by step carbon trading cost calculation model can be formulated. Secondly, the minimum carbon emissions and generation costs are selected as the optimization objectives. Many constraints of the system are considered comprehensively. A low carbon multi source coordinated dispatching model with low load scenarios based on multi objective is formulated. Then, the improved firefly algorithm is used to achieve the optimal dispatching scheme. Finally, taking a system with 10 wind farms as an example, three different experiments show that the proposed method can effectively reduce carbon emissions and improve the operating economy of the system. The influence of wind power grid connected permeability on system operating mode is also analyzed, it shows that low carbon multi source coordinated dispatch in the low load scenario is closely related to the penetration of wind power grid connected.