Method for solving voltage sag of power grid through energy storage scheduling under micro-grid
A technology for grid voltage and energy storage scheduling, applied in the field of microgrid, can solve problems such as voltage sags that cannot be solved, and achieve the effect of reducing energy storage investment and transformer expansion investment and rational construction.
Pending Publication Date: 2019-07-09
ZHANGJIAKOU POWER SUPPLY COMPANY OF STATE GRID JINBEI ELECTRIC POWER COMPANY +2
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Problems solved by technology
[0005] In order to solve the above-mentioned problem that the voltage sag cannot be solved, the present invention provides a method for solving the power grid voltage sag under the micro-grid through energy storage scheduling
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[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0037] Such as figure 1 As shown in , a method for solving power grid voltage sag through energy storage scheduling in a microgrid, the steps are as follows:
[0038] Step 1: Establish an equivalent power consumption circuit model based on the transformer, power load and energy storage under the microgrid, such as figure 2 as shown, figure 2 In the equivalent model, Vi represents the transformer, Vb represents the energy storage, Z1 represents the impedance of the transformer, Z4 represents the impedance of the energy storage, Z2 and Z3 represent the grid impedance, Zo1, Zo2 and Zo3 represent the near-end branch, middle-end branch and far-end branch respectively. The electrical load impedance of the end branch circuit, i1, i2, i3, i4, io1, io2, io3 represent the current of each branch, Vo1, Vo2, Vo3 represent the voltage of each branch;
[0039] St...
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The invention provides a method for solving voltage sag of a power grid through energy storage scheduling under a micro-grid, which at least comprises a plurality of charging stations, wherein each charging station at least comprises the micro-grid; the micro-grid at least comprises a plurality of transformers, a plurality of electric loads and a plurality of energy storages, primary windings of the transformers are electrically connected with a power supply; first ends of secondary windings of the transformers are electrically connected with first ends of the energy storages and first ends ofthe electric loads respectively; second ends of the energy storages and second ends of the electric loads are electrically connected with second ends of the secondary windings of the transformers respectively, so as to provide the method for solving the voltage sag of the power grid through energy storage scheduling under the micro-grid.
Description
technical field [0001] The invention relates to the technical field of micro-grids, in particular to a method for solving power grid voltage sags through energy storage scheduling under micro-grids. Background technique [0002] At present, when the demand for fast charging of electric vehicles is becoming more and more urgent, in order to solve the problems of difficult expansion of transformers, high cost, short-term flickering of the power grid caused by fast charging, and uncertain charging locations of electric vehicles, energy storage cannot be solved everywhere. For the short-term energy demand of fast charging of electric vehicles, distributed energy storage must be used to solve the energy demand problem of regional fast charging of electric vehicles. Adjust the control to achieve the maximum utilization of energy. There are many types of power loads in the power grid, and the regional distribution is uneven. When the energy storage energy is dispatched, it must be...
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IPC IPC(8): H02J3/12H02J3/28
CPCH02J3/12H02J3/28H02J2203/20
Inventor 郝晓晓严琦龙张新瑞段丽荣罗飞齐炜李素娟
Owner ZHANGJIAKOU POWER SUPPLY COMPANY OF STATE GRID JINBEI ELECTRIC POWER COMPANY