规模风电接入下考虑多区域频率动态安全的机组组合与风险调度

Unit Commitment and Risk Dispatch Considering Multi-regional Frequency Dynamic Security Under Large-scale Wind Power Access

规模风电并网加剧了不同区域间惯量分布不均的问题,给多区域系统的频率安全防御带来挑战。该文提出一种兼顾风电出力不确定性与多区域频率动态安全的两阶段风险调度模型。第一阶段基于条件风险价值理论协同优化多区域系统的运行成本与运行风险,并求得风电可接纳安全边界;第二阶段在恶劣风电场景下进行多区域频率动态安全校核。将备用容量解耦为非事故备用与事故备用,分别嵌套于两阶段模型中,实现求解思路的清晰化。最后通过列与约束生成算法求解此两阶段优化问题。算例仿真验证表明,所提模型和方法能有效提升多区域系统的频率响应能力,保证安全经济运行。

The integration of large-scale wind power into the grid exacerbates the problem of uneven distribution of inertia among different regions,which brings challenges to the frequency security defense of multi-regional systems.This paper proposes a two-stage risk dispatch model considering the uncertainty of wind power output and the dynamic safety of multi-regional frequencies.The first stage is based on the conditional value-at-risk theory to synergistically optimize the operation cost and operation risk of the multi-regional system,and obtain the acceptable safety boundary of wind power.In the second stage,a multi-regional frequency dynamic safety check is carried out under severe wind power scenarios.The reserve capacity is decoupled into non-accident reserve and accident reserve,which are respectively nested in the two-stage model to achieve a clear solution idea.Finally,the two-stage optimization problem is solved by the column and constraint generation algorithm.The simulation verification of an example shows that the proposed model and method can effectively improve the frequency response capability to the multi-region system and ensure safe and economical operation.