考虑不同光伏渗透率影响的配电网风险规划研究

Risk planning of distribution network considering different PV permeability

针对含光伏电源的配电网规划问题,考虑光伏输出特性受天气影响和因此造成配网潮流方向的改变和产生电压偏差等影响因素,提出了一种考虑不同光伏渗透率和电网运行风险的配电网规划方法。将天气状态大致归为3类,得到3种典型的光伏出力曲线。采用两状态天气模型,用不同天气条件下的线路故障率和光伏出力来表征天气状况对网架线路规划方案的影响,并通过系统切负荷期望值评估了规划方案的运行风险。提出了用于对不同光伏渗透率下规划方案经济性进行了评估的光伏发电投资收益比,综合给出合理的规划方案,并用不同的配电规划系统进行了测试。研究结果表明,光伏渗透率对光伏投资收益比和网架线路规划有重要影响。

Aiming at distribution network planning problem which contained photovoltaic power, considering the influence of the weather and the change of the flow direction of the distribution network and the voltage deviation, a distribution network planning method considering dif- ferent PV penetration rate and grid operation risk was proposed, The weather condition was classified into three categories, then three typical PV output curves were obtained. Two state weather model was adopted, the influence of weather conditions on the planning scheme of grid lines was characterized by the line failure rate and PV output under different weather conditions, and the operation risk of the planning scheme was evaluated by the system load loss value. The economic performance of the photovohaic power generation investment was put for- ward, which was used to evaluate the economic performance of different PV penetration rate, at last, comprehensive planning scheme was given, which was proved by two different distribution network test system. The results indicate that photovoltaic permeability has an important influence on the PV investment income ratio and the grid line planning.