Abstract:With the increasing proportion of photovoltaic installed capacity, the randomness and intermittency of its output pose a great threat to the safe operation of the power grid. Rational allocation of energy storage is an effective means to improve the photovoltaic consumption rate and ensure the safe operation of the power grid. Therefore, the overall consideration is made from the two levels of transmission network and distribution network. Under the condition of taking into account the power flow exchange constraints at the two levels, the flexible adjustable electrolytic aluminum load is used to participate in the consumption of photovoltaic power at the transmission network level, and the reasonable allocation of energy storage at the distribution network side can smooth the fluctuation of photovoltaic output. The linear power flow model with reactive power is adopted at the transmission network level, and the Distflow power flow model is adopted at the distribution network side. Based on the design of a municipal transmission network and IEEE14 distribution network system, the simulation analysis shows that taking into account the electrolytic aluminum load characteristics of the transmission network can reduce the energy storage configuration cost on the distribution network side.