Abstract
The power gap between supply and demand in the microgrid caused by the uncertainty of wind and solar output and users’ electricity consumption needs to be absorbed by the hybrid energy storage devices and the demand-side electricity price response. To maximize the service life of the lithium battery pack, this paper optimizes a reasonable ratio of the supercapacitor pack’s daily charge and discharge times to the daily cycle times of the lithium battery pack. The model construction includes two parts: power prediction and multi-objective optimization modeling. In the case study, a microgrid district under the Guizhou Power Grid is analyzed and discussed. Based on the predicted wind output, solar output, and load demand on a certain day, the optimal scheduling results have been obtained. On the one hand, a reasonable ratio regarding the daily charge and discharge times of hybrid energy storage devices has been obtained under the optimized parameter k in the model. Correspondingly, the daily operation and maintenance of the lithium battery pack is minimum. On the other hand, when the hybrid energy storage devices and demand-side electricity price response are included and not, the changes on the supply and demand sides (a) and of three evaluation indicators (b) are compared, respectively. Thus, the effectiveness of the model in this paper is verified.
Highlights
The microgrid is a small power grid composed of the distributed power supply, the energy storage device, the load, etc. [1]
The power source, energy storage, and load demand of a microgrid district under the Guizhou Power Grid are configured as follows: 1st, a 2000 kW wind turbine, 2nd, a 1000 kW photovoltaic, 3rd, hybrid energy storage devices composed of a supercapacitor pack and a lithium battery pack, whose parameters are shown in Table 1, and 4th, the load whose daily maximum is 2000 kW
Because the service life of the lithium battery pack is determined by the unit with the shortest service life in the pack, it is required that the daily cycle times of each unit in the lithium battery pack are as uniform as possible
Summary
The microgrid is a small power grid composed of the distributed power supply, the energy storage device, the load, etc. [1]. The microgrid is a small power grid composed of the distributed power supply, the energy storage device, the load, etc. The hybrid energy storage devices composed of the supercapacitor pack and the lithium battery pack can make up for the technical defect of a single energy storage device and achieve complementary advantages [2,3]. The uncertainty on both sides of the supply and demand would cause the supply and demand power gap. The power gap would be allocated between the supercapacitor pack and the lithium battery pack. It is necessary to optimize and decide the aforementioned “reasonable ratio”
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