The government can formulate appropriate energy storage subsidies or incentive policies to reduce the investment and operating costs of household PV storage system, so as to effectively improve the economic benefits of rural household PV storage system.
The results show that: When the rural household PV system is not equipped with energy storage, the PV local consumption rate is 34.58%, and 65.42% of PV power still has to be connected to the grid for consumption, posing a threat to the safe and stable operation of the distribution network.
The paper considers three scenarios for the operation of household PV system, as shown in Table 1, including household PV without energy storage, household PV with distributed energy storage, and household PV with centralized energy storage. The energy transmission methods in these three scenarios are shown in Fig. 1.
The Shandong government gives a subsidy of 0.3 CNY/kWh to the household PV storage system according to the actual discharging capacity of energy storage, with a continuous subsidy of 5 years and a discount rate of 7% (China Power. 2022). The peak, valley, and flat periods of the power grid and corresponding electricity prices are shown in Table 3.
Finally, suggestions are proposed to further promote the development of household PV energy storage system. The research results can provide reference for improving the local consumption of rural
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