The configuring energy storage according to technical characteristics usually starts with smoothing photovoltaic power fluctuations [1, 13, 14] and improving power supply reliability [2, 3]. Some literature uses technical indicators as targets or constraints for capacity configuration.
From the time dimension, when the short-term (minute-level) output volatility of new energy needs to be suppressed, the main purpose of energy storage configuration is to offset the penalties of output deviations.
The maximum power of energy storage systems is 0.9156 p.u, which is depicted in Fig. 7. The rated capacity is 0.834 p.u., the MPS wind energy loss is 0, which guarantees full connectivity to the internet, but the resulting energy storage system would cost a great deal. Fig. 7. Energy storage capacity and energy loss.
It can be observed that as the configuration ratio of W/PV reduces gradually, the installed capacity of wind power decreases while that of solar power rises accordingly. The changing trend of the installed capacity for ESS is not the same as for wind or solar power.
Therefore, the energy storage system is configuration mainly based on the time domain and frequency domain to optimize the configuration of the energy storage system capacity and the study of energy storage control strategies.
From the SW perspective, the configuration ratio of W/PV is 5.61. More wind power is installed since wind power is more appropriate to align with the load curve than solar power. Compared to Case 1, an 80-MW thermal power unit is not invested and the RES utilization ratio increases slightly to 95.2%.