计及机组组合与线路重构协同的电热联合系统消纳弃风研究

Wind power consumption in a CHP system considering the collaboration of unit combination and line reconstruction

现有文献仅以线路传输功率限制或“热电耦合”约束为单一弃风原因研究电热联合系统的消纳弃风策略,因而仅适用于消纳单种原因产生的弃风。针对这一问题,同时考虑两种弃风原因,研究进一步提高风电消纳的调度策略,提出了一种计及电网线路重构的直流潮流改进算法。在此基础上构建了考虑优化机组组合与线路重构的电热联合系统源网协同调度模型。通过实例仿真,验证了该模型能够根据弃风量大小和弃风原因的不同,通过机组出力优化、机组组合和输电线路重构3种策略的合理选取或组合,同时消纳由两种原因引起的弃风。并且该模型能够在不新增投资的情况下,实现风电消纳最大化。

Existing studies only analyze the consumption measures in a CHP system from a single aspect,namely the CHP units’"thermo-electric coupling"and power network safety constraints.Therefore,these strategies are only applicable to the curtailed wind power caused by a single reason.This present a problem,and this paper studies the dispatch strategy of consuming curtailed wind power taking into account two reasons at the same time.It proposes an improved DC power flow algorithm considering line reconstruction.Based on the algorithm,a source-grid collaboration dispatch model including unit combination and line reconstruction in a CHP system is established.A case study shows that through a reasonable choice or combination of three strategies i.e.unit output optimization,unit combination and line reconstruction,the model can reduce curtailed wind power caused by those two reasons depending on the amount and the reason for the wind power curtailment.It can also achieve maximum wind power consumption without new investment.