Cooling-heating-power combined supply type multi-microgrid system and economic optimal dispatching method thereof

Abstract

The invention discloses a cooling-heating-power combined supply type multi-microgrid system and an economic optimal dispatching method thereof. The system comprises an energy storage power station anda plurality of microgrids connected with the energy storage power station. The energy storage power station is provided with an energy management system of the energy storage power station, and the micro-grid is provided with an energy management system of the micro-grid. An electric tie line is set up between each micro-grid and the energy storage power station, and the electric bus bar of the micro-grid is connected with the electric tie line so as to be connected to the common connection point of the energy storage power station, so that the electric energy between the energy storage powerstation and each micro-grid flows mutually; the energy management system of the energy storage power station formulates the economic optimal dispatching plan of the multi-grid system of the combinedcooling, heating and power supply, and the micro-grid energy management system of each micro-grid executes the economic optimal dispatching plan, so as to realize the overall economic optimization ofthe operation of the multi-grid system of the combined cooling, heating and power supply. The method not only meets the demand of cooling and heating power load of each micro-grid, but also has no waste of cold, heat and power, and can significantly reduce the economic cost of daily operation.

Description

technical field [0001] The invention relates to an optimal scheduling method, in particular to a combined cooling, heating and power multi-microgrid system considering the service of an energy storage power station and an economical optimal scheduling method thereof, belonging to the technical field of comprehensive energy utilization. Background technique [0002] Energy storage acts on different links of the power system. The overall function is to realize the grid connection of new energy power, maintain efficient and safe operation of the power grid, and balance power supply and demand. The energy storage system installed at the end user can improve the reliability of power supply through power storage and release. Especially in the event of unexpected power outages and other accidents, demand-side management can be carried out. In areas with time-of-use pricing, electricity can be purchased from the grid during low electricity price periods. Stored in energy storage, re...

AI Technical Summary

Problems solved by technology

[0004] However, the investment cost of existing user-side energy storage is relatively high. The construction cost of lead-carbon batteries is 1,500-2,000 yuan / kWh, and the construction cost of lithium-ion batteries with higher charge and discharge rates reaches 2,500-3,000 yuan / kWh. The recovery period of investment cost is relatively long. Taking an energy storage power station (lithium iron phosphate) as an example, the energy storage capacity is 4MWh, the energy storage power is 1MW, and the cost recovery period is as long as 12 years.

The disadvantages of high investment cost and long cost recovery period of user-side energy storage limit the development and application of energy storage power stations

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