Charging-discharging control method and system for energy storage units in distributed energy storage direct current microgrid
A technology of DC microgrid and distributed energy storage, which is applied in the direction of parallel operation of DC power supplies, electrical components, battery circuit devices, etc., can solve the problems of short life of the state of charge energy storage unit, achieve improved life, fast and accurate balance , Guarantee the effect of line voltage
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Embodiment 1
[0044] A charging and discharging control method for an energy storage unit in a distributed energy storage DC microgrid. In the discharging phase, the controller corresponding to the pth energy storage unit controls its discharge, and the controller corresponding to the qth energy storage unit controls its discharge. , and when SOC p >SOC q When , the discharge current controlled by the controller corresponding to the pth energy storage unit is greater than the discharge current controlled by the controller corresponding to the qth energy storage unit; in the charging stage, the controller corresponding to the pth energy storage unit Control its charging, the controller corresponding to the qth energy storage unit controls its charging, and when SOC p >SOC q , the charging current controlled by the controller corresponding to the pth energy storage unit is greater than the charging current controlled by the controller corresponding to the qth energy storage unit; where p an...
Embodiment 2
[0067] On the basis of embodiment one, the governing equation is: u dcj = u dcref -K j i dcj ·G j + r j i dcj , where r j Indicates the line impedance corresponding to the jth energy storage unit.
[0068] For example, figure 1 The power system in is simplified to get figure 2 ,Such as figure 2 As shown, n voltages are u dcref The power supply passes through the resistance m j (SOC) and r j The impedances are connected in parallel with each other, while giving an impedance of R load The resistor power supply, u pcc is the common point voltage, i dcj For the jth energy storage unit, the resistance is m j The output current output by the resistance of (SOC) can be obtained from the circuit relationship:
[0069]
[0070] The subscript j represents the relevant variable of the jth energy storage unit, such as i dcj Represents the output current of the jth energy storage unit, R s is the parallel impedance, and n represents the total number of energy storage...
Embodiment 3
[0092] A charging and discharging control system for energy storage units in a distributed energy storage DC microgrid, including: controllers corresponding to all energy storage units in the distributed energy storage DC microgrid; The controller controls its discharge, and the controller corresponding to the qth energy storage unit controls its discharge, and when the SOC p >SOC q , the discharge current controlled by the controller corresponding to the pth energy storage unit is greater than the discharge current controlled by the controller corresponding to the qth energy storage unit; in the charging stage, the pth energy storage unit corresponds to The controller controls its charging, and the controller corresponding to the qth energy storage unit controls its charging, and when the SOC p >SOC q , the charging current controlled by the controller corresponding to the pth energy storage unit is greater than the charging current controlled by the controller correspondin...
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