Based on renewable energy output scenarios generated in Section 2 and congestion information provided in Section 3, this section constructs an optimal configuration model of energy storage. This model takes the uncertainty of renewable energy outputs into consideration, so that it enhances the rationality and feasibility of the optimal results.
3. The proposed optimal configuration method of energy storage can improve the operation flexibility of power system and the utilization of renewable energy generation. Therefore, it overcomes the disadvantages of traditional transmission network expansion planning, such as high investment cost and poor economic performance.
When the minimum requirement for renewable energy accommodation rate is raised to 85%, the energy storage system configuration results in a capacity of 360.77 kWh and a power of 142.17 kW. Similarly, when the indicator is raised to 90%, the energy storage system configuration results in a capacity of 424.45 kWh and a power of 231.19 kW.
If the key components causing the transmission congestion are evaluated and identified, then energy storage can be reasonably configured. It absorbs energy when the components are congested and releases energy during the uncongested periods.
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