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公开(公告)号：EP3382839A1
公开(公告)日：2018-10-03
申请号：EP17290045.8
申请日：2017-03-28
摘要： The invention lies in the field of current stabilisation in a power generation system comprising a plurality of elementary power groups connected in parallel. It relates to a control system for regulating the elementary power groups.
According to the invention, the control system comprises a global current control system (510) and a plurality of local current control systems each associated with an elementary power source of the power generation system. The global current control system (510) comprises:
▪ a divider (511) arranged to deliver a fixed current set point I n_fix ,
▪ a correction unit (512) arranged to deliver a variable current set point I n_var and to take either a steady state or a transitory state, the variable current set point I n_var being determined as a function of a correction signal S corr in the transitory state,
▪ an adder (513) arranged to deliver a global current set point I n _ glob as the sum of the fixed current set point I n_fix and the variable current set point I n_var , and
▪ a scenario management unit (514) arranged to detect when the state of at least one elementary power source (220 1 -220 N ) switches from an OFF-state to an ON-state, or vice versa, to determine the correction signal S corr and to trigger the transitory state of the correction unit for a predetermined transitory period τ trans when a change of state is detected.-
公开(公告)号：EP3989429A1
公开(公告)日：2022-04-27
申请号：EP20275162.4
申请日：2020-10-22
摘要： An electrical assembly (20) comprises:
a converter-based electrical device (22); and
a transformer (24) for connecting the converter-based electrical device (22) to an AC electrical network (42), a first transformer side (44) of the transformer (24) connected to the converter-based electrical device (22), a second transformer side (46) of the transformer (24) for connection to the AC electrical network (42), the transformer (24) including a plurality of taps, the transformer (24) including a tap changer operable to selectively connect to the or each tap to modify a turn ratio of the transformer (24),
wherein the transformer (24) includes a controller (54b) configured to selectively operate the tap changer in an AC voltage modification mode, responsive to an abnormal operating state of the electrical assembly (20), to modify the turn ratio of the transformer (24) so as to modify an AC voltage at the first transformer side (44).-
公开(公告)号：EP3382839B1
公开(公告)日：2020-10-21
申请号：EP17290045.8
申请日：2017-03-28
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公开(公告)号：EP3614552A1
公开(公告)日：2020-02-26
申请号：EP18190658.7
申请日：2018-08-24
发明人： BRIFF, Pablo, Ariel , DANG, Huy Quoc Si , ZHANG, Richard S. , DE PREVILLE, Guillaume , BREHAUT, Stéphane, Pierre , JASMIN, Omar
IPC分类号： H02M7/483
摘要： In the field of high voltage direct current (HVDC) transmission, a voltage source converter (10) comprises first and second DC terminals (12, 14) that are for connection to a DC network (16). The voltage source converter (10) also includes at least one converter limb (18). The or each converter limb (18) extends between the first and second DC terminals (12, 14) and includes first and second limb portions (20, 22) that are separated by a respective AC terminal (24) for connection to a corresponding phase of an AC network (26). Each first limb portion (20) extends between the first DC terminal (12) and a corresponding AC terminal (24), and each second limb portion (22) extends between the second DC terminal (14) and the corresponding AC terminal (24). Each limb portion (20, 22) includes a respective chain-link converter (28) which is defined by a plurality of series-connected switching modules (30) which are operable in combination to provide a stepped variable voltage source. In addition the voltage source converter (10) also includes a control apparatus (32) that is configured to coordinate operation of the chain-link converters (28) to cause an exchange of power between the DC and AC networks (16, 26). The control apparatus (32) evaluates the combined performance of the switching modules (30) within at least one chain-link converter (28) and acts to modify the coordinated operation of the chain-link converters (28) when the combined performance of the said switching modules (30) becomes degraded to a predetermined extent.
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公开(公告)号：EP3975409A1
公开(公告)日：2022-03-30
申请号：EP20275150.9
申请日：2020-09-25
IPC分类号： H02M7/483
摘要： There is provided a switching valve for a voltage source converter (20). The switching valve comprises a plurality of modules (44), each module (44) including at least one switching element (46) and at least one energy storage device (48), the or each switching element (46) and the or each energy storage device (48) in each module (44) arranged to be combinable to selectively provide a voltage source, the switching valve including a controller (50) configured to selectively control the switching of the switching elements (46) to select one or more of the modules (44) to contribute a or a respective voltage to a switching valve voltage,
wherein the controller (50) is configured to selectively carry out a module (44) selection by:
assigning each module (44) with a respective address in an address queue;
in a respective one of a plurality of sampling events, selecting one or more voltage contributing modules (44) in order of its assigned address in the address queue; and
between different sampling events, changing the order of selecting the or each voltage contributing module (44) based on its assigned address in the address queue.-
公开(公告)号：EP3726721A1
公开(公告)日：2020-10-21
申请号：EP19170425.3
申请日：2019-04-19
IPC分类号： H02M7/483
摘要： A method is provided for selecting submodules of a valve of modular multilevel converter in order to generate a desired valve output voltage. The method comprises: obtaining (410) a voltage value for each submodule of the valve indicative of a voltage across an energy storage element of the submodule; for each submodule of the valve: if the submodule was previously selected: (420) adding or subtracting a first shift voltage value to the obtained voltage value for the submodule based on a sign of a current in the valve to generate a modified voltage value for the submodule; and adding (430) the submodule to a histogram according to the modified voltage value for the submodule; if the submodule was not previously selected: adding (430) the submodule to a histogram according to the voltage value for the submodule. No submodules, one submodule or more than one submodule, are selected (440), based on their ranking in the histogram, to activate so as to generate the desired valve output voltage
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