The operation mode is that the PV is self-generation and self-consumption, and the surplus PV power is connected to the grid. According to the optimized configuration results of energy storage under the grid-connected mode, the detailed operation of the household PV storage system in each season in Scenario 4 is shown in Fig. 21, Fig. 22, Fig. 23.
In 2021, household PV contributed 21.6 GW of new installed capacity, accounting for 73.8 % of the new installed capacity of distributed PV. However, due to the randomness and intermittency of PV power generation, large-scale household PV grid connection has a serious impact on the safe and stable operation of the distribution network.
Both Scenario 3 and Scenario 4 are grid-connected operation of household PV. The operation mode is that the PV is self-generation and self-consumption, and the surplus PV power is connected to the power grid.
In addition, in order to further improve the energy utilization rate and economic benefits of household PV energy storage system, practical and feasible targeted suggestions are put forward, which provides a reference for expanding the application channels of distributed household PV and accelerating the development of distributed energy.
Under the off-grid mode, compared with the household PV system (Scenario 1), the NPV and IRR of the household PV storage system (Scenario 2) are significantly improved, the dynamic investment payback period is significantly shortened, and the annual net profit increases from −46 $ to 7294 $.
Grid-connected household energy storage system is as shown in Figure 1: Off-grid household energy storage system is independent, without any electrical connection to the grid. Therefore, the whole system does not need grid-connected inverter except PV inverter. The off-grid household energy storage system is also divided into three working modes.
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