面向现货市场出清的发电计划校正决策方法

Decision-making Method of Generation Scheduling Correction for Electricity Spot Market Clearing

边界条件设置不合理等原因导致现货市场预出清结果不能满足全部安全约束时,应采取必要的安全校正措施。文中提出了一种消除安全越限的发电计划校正方法。首先对非市场化机组实施安全校正,得到满足全部安全约束的可行解,再通过市场化机组的优化得到最终的出清结果。将静态安全域(SSR)的原理应用于非市场化机组的校正。在SSR边界的表述中纳入了机组爬坡约束,利用静态安全距离(SSD)矢量揭示最优校正方向,并基于安全距离灵敏度系数和机组的调节能力,评估各台机组对消除安全越限的有效性。基于此,提出了发电计划校正决策的方法,并在计算流程中考虑了各个时段的校正对相邻时段SSD的影响,以此增强校正优化的效果。以IEEE 118节点系统为例,分析了发电计划校正的结果,以及安全约束限值、机组爬坡能力对安全校正的影响,由此验证了所提方法的有效性。

When the pre-clearing result of an electricity spot market could not meet all the security constraints due to inappropriate boundary condition settings or other reasons,the necessary security correction measures should be implemented.This paper proposes a generation scheduling correction method to eliminate security violations.The security correction is first applied to the non-market units to get the feasible solution which meets all the security constraints.Then the final clearing result is obtained by the optimization of market units.The theory of steady-state security region(SSR)is applied to the non-market unit correction,and the ramping constraints are included in the description of the SSR boundary.The optimal correcting direction could be revealed by the vector of steady-state security distance(SSD).And the effectiveness that each unit eliminates security violations could be evaluated based on the sensitivity of security distance and the regulating ability of the unit.Based on this,the generation scheduling correction decision-making method is proposed,and the influence of the correction in each time interval on the SSD of the adjacent time interval is considered during the calculation procedure.Thus,the effect of correction optimization is improved.Based on the IEEE 118-bus system,the correction results and the influence of security constrain limits and unit ramping ability on security correction are analyzed,which prove the effectiveness of the proposed method.