Photovoltaic integration capacity of grid considering peak load regulation capacity and operating economy
With the increasing integration of photovoltaic, it is of much significance to study the capacity of grid-connected photovoltaic integration because peak load regulation capacity of power grid has become the bottleneck problem. This paper applies the Lagrangian Relaxation method of unit combination problem to find the photovoltaic integration capacity. With the consideration of peak load regulation, the optimal goal is to find the minimum system operating cost with wind power and photovoltaic introduced in the start-up mode model of unit combination. This method is applied to the analysis of future photovoltaic integration capacity of a solar resourceful province in north China according to the power structure and spinning reserve capacity, obtaining that the accommodating capacity is greater than planned. Some suggestions are put forward to magnify the integration capacity according to actual situation. These results provide reference to power supply plan, grid frame construction, operation and dispatch.