Energy storage microgrid active control method allowing planned supply reduction of direct power supply

Abstract

The invention discloses an energy storage microgrid active control method allowing planned supply reduction of a direct power supply. According to the method, an active microgrid system capable of realizing a storage and distribution integrated design minitype power distribution network control method is used as the core control object, charging and discharging of a 110 kv large-capacity energy storage array containing microgrid control nodes are managed in a unified mode in a power distribution network system environment achieving direct load supply by means of 110 kv, 10 kv and 400 v three-level power networks, active adjustment of injection efficiency of a power distribution network is achieved, and trace scheduling of a planned capacity curve for indicating reduction of power supply to a direct supply load is achieved on the premise that all or partial power supply node main transformers and energy storage capacity are sufficient. By the adoption of the method, intelligent distribution of the direct power supply to external power output and direct supply is achieved on the premise that the power supply reliability of the direct supply load is guaranteed to the maximum, unnecessary mutual power compensation is reduced, network loss is reduced, and the time for reliable power supply or all power supply nodes under the influence of the supply reduction plan is prolonged.

Description

technical field [0001] The invention belongs to the technical field of distribution networks and microgrids, and in particular relates to an active control method for energy storage microgrids that allows planned reduction of direct power supply. Background technique [0002] With the increasing proportion of intermittent renewable energy such as wind and light entering the grid year by year, the power grid is under the pressure of energy conservation and emission reduction to allow wind power and photovoltaic power generation to be connected to the grid first, squeezing the share of traditional power generation capacity connected to the grid. decline. It has become normal for some thermal power plants to operate below the rated output, and some thermal power plants have been operating as spinning reserves for a long time, resulting in difficulties in the operation of thermal power plants, losses, and failure to recover investment. [0003] In the "control method for micro-...

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Problems solved by technology

[0004] Through the above-mentioned thermal power plants through 110kV, 10kV and 400V (380-420V) and other connected multi-voltage level distribution systems to realize direct power supply to nearby loads (referred to as "load direct supply" or "direct supply"), it can solve the power generation capacity of thermal power plants The utilization rate is too low. However, once the transmission network needs the above-mentioned thermal power plants to participate in peak regulation and backup operation, the thermal power plants may not arrange excess capacity to ensure that the direct supply load and the power grid are supplied at the same time, and power contention will occur, threatening the large power grid and the power grid at the same time. Power supply reliability of distribution system where direct load is located

[0005] When the power distribution system includes micro-grid power supply nodes, and the thermal power plant has the above-mentioned temporary reduction in the demand for direct load power supply capacity (referred to as "load reduction" or "reduction"), the energy storage array in the active micro-grid, The power generation capacity of the distributed generation unit can exert effective power regulation ability, but because of the lack of corresponding control methods, its ability cannot be exerted, so that the direct power supply lacks the ability to independently allocate external power generation and direct power supply without affecting the reliability of power supply. power supply capacity

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