Device And Method For Controlling The Voltage Of Microgrids

A method for controlling a plant, wherein the plant comprises at least one electricity generation unit and/or at least one electricity storage unit, and at least one common connection terminal, which is connected to the at least one electricity generation unit and/or to the at least one electricity storage unit and which is intended to be connected to at least one line of an electricity consumption and/or production microgrid,

• a method in which at least one first central automatic controller for controlling the at least one electricity generation unit and/or of the at least one electricity storage unit computes and transmits at least one second offset voltage Uoffset(i) of each at least one electricity generation unit and/or of each at least one electricity storage unit to at least one second automatic controller for controlling each at least one electricity generation unit and/or electricity storage unit, so that the voltage of the at least one common connection terminal is set to a voltage reference UcentraleRef,
• the method comprising the following steps:
• measuring or determining by a first measuring or determining member of the at least one first central automatic controller a total active power Pcentrale leaving the plant, supplied or absorbed by the at least one electricity generation unit and/or the at least one electricity storage unit,
• measuring by a second measuring member of the at least one first central automatic controller a voltage URmes of the at least one common connection terminal,
• computing by a third computing member of the at least one first central automatic controller the voltage reference UcentraleRef of the at least one common connection terminal according to a first prescribed function f depending at least on the total active power Pcentrale,
• measuring or determining by a fourth measuring or determining member of the at least one second automatic controller a first individual reactive power Qmes(i) supplied or absorbed by the at least one electricity generation unit associated with the at least one second automatic controller and/or by the at least one electricity storage unit associated with the at least one second automatic controller to the at least one common connection terminal,
• the at least one first central automatic controller having a first voltage corrector, having a second prescribed transfer function corr,
• computing by the at least one first central automatic controller
• UcentraleRef=f(Pcentrale)
• Uoffset=corr(UcentraleRef−URmes)
• where Uoffset is a first central offset voltage, computed by applying the second prescribed transfer function corr of the first voltage corrector to the difference UcentraleRef−URmes,
• computing by the at least one first automatic controller the at least one second offset voltage Uoffset(i) from the first central offset voltage Uoffset according to a third prescribed function and transmitting by the at least one first automatic controller the at least one second offset voltage Uoffset(i) to the at least one second automatic controller for the at least one electricity generation unit associated with the at least one second automatic controller and/or for the at least one electricity storage unit associated with the at least one second automatic controller,
• computing by the at least one second automatic controller at least a local setpoint voltage Uref(i) for the at least one electricity generation unit associated with the at least one second automatic controller and/or for the at least one electricity storage unit associated with the at least one second automatic controller, according to
• Uref(i)=Uoffset(i)−KUQ(i)·Qmes(i)
• where KUQ(i) is a prescribed, non-zero coefficient.

A computer program comprising code instructions for implementing a method for controlling a plant, wherein the plant comprises at least one electricity generation unit and/or at least one electricity storage unit, and at least one common connection terminal, which is connected to the at least one electricity generation unit and/or to the at least one electricity storage unit and which is intended to be connected to at least one line of an electricity consumption and/or production microgrid,

• a method in which a at least one first central automatic controller for controlling the at least one electricity generation unit and/or of the at least one electricity storage unit computes (E5) and transmits at least one second offset voltage Uoffset(i) of each at least one electricity generation unit and/or of each at least one electricity storage unit to at least a-one second automatic controller for controlling each at least one electricity generation unit and/or electricity storage unit, so that the voltage of the at least one common connection terminal is set to a voltage reference UcentraleRef,
• characterized by measuring or determining by a first measuring or determining member of the at least one first central automatic controller a total active power Pcentrale leaving the plant, supplied or absorbed by the at least one electricity generation unit and/or the at least one electricity storage unit,
• measuring by a second measuring member of the at least one first central automatic controller a voltage URmes of the at least one common connection terminal,
• computing by a third computing member of the at least one first central automatic controller theft voltage reference UcentraleRef of the at least one common connection terminal according to a first prescribed function f depending at least on the total active power Pcentrale,
• measuring or determining by a fourth measuring or determining member of the at least one second automatic controller a first individual reactive power Qmes(i) supplied or absorbed by the at least one electricity generation unit associated with the at least one second automatic controller and/or by the at least one electricity storage unit associated with the at least one second automatic controller to the at least one common connection terminal,
• the at least one first central automatic controller having a first voltage corrector, having a second prescribed transfer function corr,
• computing (E5) by the at least one first central automatic controller
• UcentraleRef=f(Pcentrale)
• Uoffset=corr(UcentraleRef−URmes)
• where Uoffset is a first central offset voltage, computed by applying the second prescribed transfer function corr of the first voltage corrector to the difference UcentraleRef−URmes,
• computing by the at least one first automatic controller the at least one second offset voltage Uoffset(i) from the first central offset voltage Uoffset according to a third prescribed function and transmitting by the at least one first automatic controller the at least one second offset voltage Uoffset(i) to the at least one second automatic controller for the at least one electricity generation unit associated with the at least one second automatic controller and/or for the at least one electricity storage unit associated with the at least one second automatic controller,
• computing by the at least one second automatic controller at least a local setpoint voltage Uref(i) for the at least one electricity generation unit associated with the at least one second automatic controller and/or for the at least one electricity storage unit associated with the at least one second automatic controller, according to
• Uref(i)=Uoffset(i)−KUQ(i)·Qmes(i)
• where KUQ(i) is a prescribed, non-zero coefficient,
• the computer program being executed by the at least one first central automatic controller and by the at least one second automatic controller.