Abstract:
It is presented a DC/DC/AC power converter. The power converter comprises a power converter assembly comprising: a first voltage source converter and a second voltage source converter connected serially between a positive terminal and a negative terminal of the first high voltage DC connection, wherein respective AC sides of the voltage source converters are connected to a common AC bus; a DC blocking device between the AC side of at all but one of the voltage source converters and the AC bus; and a phase shift device between the AC side of the second voltage source converter and the AC side of the first voltage source converter. The terminals of the second high voltage DC connection are connected on either side of the second voltage source converter; and the AC connection is connected to the AC bus.
Abstract:
The invention relates to a photovoltaic system for generating an output voltage which is essentially uninfluenced by varying irradiation, the photovoltaic system comprising at least one photovoltaic unit (1) comp- rising two photovoltaic sources (2, 2'), each comprising an input terminal (3, 3') and an output terminal (4, 4'). The invention is characterized in that the photovoltaic unit (1) comprises two voltage adding arrangements (5, 5'), each having a first route (13) comprising a voltage source (15) and a second route (14) constituting a voltage source bypass, the first voltage adding arrangement (5) is connected in series with the first photovoltaic source (2) and the second voltage adding arrangement (5') is connected in series with the second photovoltaic source (2'), and a switch (12) is arranged between an input terminal (3) of the first photovoltaic source (2) and an output terminal (4') of the second photovoltaic source (2'), and in addition the input terminals (8, 10) of the photovoltaic unit (1) constituting the external interface of the photovoltaic system are interconnected and the output terminals (9, 11) of the photovoltaic unit (1) constituting the external interface of the photovoltaic system are interconnected.
Abstract:
A device (8) for charging of an electric vessel (18) includes a three-phase network terminal (T1) for connection to an electrical three-phase alternating current network (N1), at least one vessel connection terminal (T2) for connection to the battery of an electric vessel to be charged, and a voltage conversion arrangement (11) for converting between three-phase AC voltage at the three-phase network terminal and a single-phase voltage at the vessel connection terminal, the voltage conversion arrangement including at least one converter (12, 14) and being controllable for providing bidirectional active and reactive power exchange with the three-phase alternating current network, where the bidirectional active power exchange involves using a connected vessel battery. The invention also relates to a system and a method for charging of electric vessels.
Abstract:
A power system comprises a power generating plant (100) comprising a plurality of power generators (10), and an AC collection grid (200) adapted to interconnect the power generating plant (100) and an HVDC converter station. The AC collection grid is adapted to operate outside network regulations, whereby advantages such as simplified control and electronics are achieved. A method of operating a power system is also provided.
Abstract:
A modular energy storage device for a high voltage electrical power system is provided comprising at least two modules connected in series, each module including at least one dc power-source unit enclosed in a container and a positive and a negative terminal, and the device further comprising a positive and a negative pole, a first conductor including a plurality of conductor parts connected to the terminals of the modules to provide a series connection of the modules, and a second conductor connected to the negative terminal of the last module in the series connection of modules, and the first and second conductor are arranged to form a current path between the positive and negative poles, the first and second conductors are arranged to pass through the containers in parallel such that a current flows through the first conductor in a first direction and through the second conductor in a second direction opposite to the first direction.
Abstract:
The invention relates to a photovoltaic system for generating an output voltage which is essentially uninfluenced by varying irradiation, the photovoltaic system comprising a photovoltaic source (1) having an input terminal (2) and an output terminal (3). The photovoltaic system is characterized in that the photovoltaic system comprises a voltage adding arrangement (4) comprising a first input terminal (5) and an output terminal (6), the voltage adding arrangement (4) is connected in series with the photovoltaic source (1), and in that a first route (7) comprising a voltage source (9) and a second route (8) constituting a voltage source bypass extend between said first input terminal (5) and said output terminal (6) of the voltage adding arrangement (4), said first and second routes being alternately activateable.
Abstract:
A power converter (9) for transferring power between a high voltage DC connection ( DC + , DC - ) and a high voltage AC terminal (AC, AC 0 ). The power converter comprises a power converter assembly (9) comprising : a first switch (4a), a first converter arm (3a), a second converter arm (3b), and a second switch (4b), connected serially in the mentioned order between the positive and negative terminals of the DC connection; and a connection link (15a, 15b, 13) arranged from a point between the second converter arm (3b) and the second switch (4b) and a point between the first converter (3a) arm and the first switch (3b). Each one of the converter arms (3a, 3b) comprises a plurality of converter cells (32, 32a-d) and each one of the converter cells has at least one switching element (40) and an energy storage element (41); the high voltage AC terminal is provided between the first converter arm (3a) and the second converter arm (3b).
Abstract:
It is presented a power converter (7) for converting power between a first high voltage direct current, DC, connection (DC1) and a second high voltage DC connection (DC2). The power converter assembly comprises: a first side assembly (1a) comprising at least two first side channels (2a, 5a, 2b, 5b), each arranged between two connectors (DC1+, DC1-) of the first high voltage DC connection (DC1), wherein each one of the first side channels comprises: a converter arm (2a) and a primary winding (5a), such that the converter arms of the first side channels are arranged to balance an alternating current component through the at least two first side channels to prevent the alternating current component from reaching the first high voltage DC connection; and a second side assembly of the same structure as the first side assembly but with a secondary winding (5b). At least two separate electromagnetic couplings are formed, each including a respective primary winding (5a) of a first side channel and a secondary winding (5b) of a second side channel.
Abstract:
The present invention relates to a system for distributing electric power to an electrical grid (106). The system comprises a DC/AC inverter (102) arranged to convert a DC voltage output from an electric power generator (101) to an AC voltage, a transformer (103) arranged to receive said AC voltage, transform said AC voltage and deliver the transformed AC voltage to the grid (106), and a connector (104) arranged to selectively connect and disconnect the transformer (103) from the grid (106). The DC/AC inverter (102) is arranged to control primary winding magnetizing current delivered to the transformer (103). Further, the connector (104) is arranged to selectively connect and disconnect the grid (106) to and from the transformer (103) on the basis of the controlled magnetizing current.
Abstract translation:本发明涉及一种用于将电力分配给电网(106)的系统。 该系统包括被配置为将从发电机(101)输出的直流电压转换为交流电压的直流/交流逆变器(102),布置成接收所述交流电压的变压器(103),变换所述交流电压并输送 转换的交流电压到电网(106),以及连接器(104),其布置成选择性地将变压器(103)与电网(106)连接和断开。 DC / AC逆变器(102)被布置成控制传递到变压器(103)的初级绕组磁化电流。 此外,连接器(104)被布置成基于受控的磁化电流选择性地将电网(106)与变压器(103)连接和断开。
Abstract:
The invention relates to a dc power source (3) for a high voltage power apparatus (1), the dc power source (3) comprising one or more strings (4a-c) including a plurality of dc power source units connected in series, and switches (7, 9, 11, 13) configured to connect and disconnect said strings (4a-c). The switches (7, 9, 11, 13) are solid-state switches distributed among the power source units of each string (4a-c), and all solid-state switches (7, 9, 11, 13) in the string (4a-c) are arranged so that they are turned on and off simultaneously. Each switch (7, 9, 11, 13) is connected in parallel with a first controllable semiconductor (16) in a first direction and connected in parallel with a second controllable semiconductor (20) in a second direction which is opposite to the first direction, and the dc power source (3) comprises a control unit (21) configured to bypass a failed switch (7, 9, 11, 13) by triggering the forward biased of the first (16) or second (20) controllable semiconductor connected to the failed switch (7, 9, 11, 13) in case a fault in the switch (7, 9, 11, 13) is detected