Abstract: This paper investigated the influence of different dynamic electricity pricing schemes,energy storage capacity and unit capacity cost on the economics of PV-storage systems. The energy storage control stratety of improving the photovoltaic micro-grid selfconsumption was adopted in this study. Taking an office building in Changsha as an example,the dynamic planning method was used to solve the system’s best operating strategy and calculated the system’life cycle economy and PV self-consumption rate. The results showed that the system profitable area was increased by 87% for every 41.5% increase of dynamic electricity price. Moreover,the impact of energy storage capacity on system economics is greater than unit cost. The increase of dynamic electricity price is beneficial to increase the self-consumption of photovoltaic power generation,and the storage capacity and unit cost dominate the self-consumption of photovoltaic energy in different intervals.