A joint day-ahead scheduling for photovoltaic-storage systems based on extended QV bus-type power flow

Abstract

This paper focuses on voltage fluctuation and the mismatch between generation and load demand caused by photovoltaic access to distribution network, using energy storage to solve negative effects brought by photovoltaic. According to the characteristics of point of common coupling (PCC) photovoltaic and energy storage accessed to, extended QV bus-type is put forward in order to describe the feature of PCC more reasonably. The solution of power flow calculation with QV bus-type is also shown in this paper. Furthermore, a joint day-ahead scheduling of photovoltaic-storage is put forward in core view of voltage control at PCC. The two scenarios where whether the power output of energy storage system is beyond the limit are considered. When the power output beyond its limit, the bus-type is transformed. As a consequence, node voltage curve and joint power curves of photovoltaic-storage are thus gained. The result is comprehensively compared with the case where photovoltaic and energy storage operate with constant power. It shows that the strategy this paper proposed has a significant effect on suppressing voltage fluctuation, improving power flow, peak load shifting and so on.