Abstract:
In a robot system (10) comprising a plurality of robots (20, 40) with overlapping work areas (60) a risk for collision between the robots (20, 40) exists if they are allowed to simultaneously operate within the overlapping work areas (60). A method for avoiding collisions between two robots (20, 40) in such robot system (10) comprises the steps of: providing (320) first movement information (240) related to a first robot movement (190)which is to be executed (360) by a first robot (20); retrieving (340) the first movement information (240); determining (350) for a plurality of second robot movements (210) whether they involve a risk for collision between the first and second robots (20, 40); and executing (360) one of the second robot movements (210). In a robot system (10) configured to carry out a pick and place task each robot (20, 40) oftentimes has a plurality of available robot movements that can be executed (360) depending on which item (140) to pick or at which empty place (160) to place an item (140). Information about a movement of one robot (20, 40) enables a robot controller (70, 80) of another robot (20, 40) with an overlapping work area (60) to select (330) among available robot movements an appropriate one that does not involve a risk for collision between the two robots (20, 40).
Abstract:
The present disclosure relates to a multilevel power converter 1 comprising at least one phase leg. The phase leg comprises a plurality of cascaded chain link connected cells 2, each cell comprising a capacitor 3 and two semiconductor switches 5 in series, each with an anti-parallel connected diode 6. The plurality of cascaded chain link connected cells comprises first and second cells 2a and 2b which form a mirrored cell-pair such that the two semiconductor switches of each of the first and second cells are all connected in series with each other. The converter further comprises an energy storage 4 connected between the first and second cells.
Abstract:
The invention concerns a switchyard for interconnecting direct current power networks (N1, N2, N3) and a direct current power transmission system comprising such a switchyard. The switchyard comprises a number of interconnected entities comprising at least two main circuit breakers (MB1, MB2) and a number of transfer switches (TS1, TS2, TS3, TS4, TS5, TS6, TS7), where each network has two connections to the switchyard, at least one via a transfer switch (TSi, TS2, TS3, TS4, TS5, TS7), each main circuit breaker has four connections in the switchyard, two at each end of the main circuit breaker and at least one via a transfer switch (TS1, TS2, TS3, TS4, TS5), and each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers.
Abstract:
The present disclosure relates to a valve unit comprising a plurality of converter cells, a plurality of connecting elements and a plurality of holding elements.. The plurality of converter cells is arranged as a stack along an axial direction. A holding element is arranged to support at least one converter cell. A converter cell includes a body extending in a radial direction between an outer perimeter and an inner perimeter such that the stack of converter cells defines an inner space. The plurality of connecting elements are arranged to mechanically connect the holding elements. The connecting elements extend from a first holding element to another in a space delimited by the outer perimeter of a converter cell arranged between the holding elements. The valve unit may form part of a converter in a high voltage direct current converter station.
Abstract:
A mechanical interlock assembly for a disconnector and an earthing switch is provided. It comprises: a main interlock disc (172) configured to actuate a movable contact of a disconnector (11), and at least one earthing switch interlock disc (173, 173') configured to actuate respective movable contact of at least one earthing switch (12, 13) respectively. The main interlock disc (172) is provided with at least one first groove (1721), and each of the at least one earthing switch interlock disc (173, 173') is provided with a third groove (1731), and it is provided with a movable interlock pin (174) between the main interlock disc (172) and each earthing switch interlock disc (173, 173') respectively. This interlock assembly can interlock the disconnector and the at least one earthing switch, and has the advantages of a simple structure, low cost and flexibility for different arrangements. A further mechanical interlock assembly is also provided to interlock another disconnector and one of the above at least one earthing switch.
Abstract:
The present invention provides a method for time synchronizing one or more devices in a control network using a first device. The method comprises selecting a first device from information of the topology of the control network. The method further comprises sending a first set of packets to the second device, receiving a first set of delay requests in response to the first set of packets, and sending a first set of delay responses in response to the first set of delay requests. The method further comprises, determining a first set of forward times and first set of backward times. The method further comprises, determining a first minimum forward time and a first minimum backward time. Further the method comprises determining a first correction factor. The method also comprises, applying the first correction factor to a clock provided at the second device and storing the first correction factor.
Abstract:
A divider mechanism, for directing articles (100) traveling along a stem conveyor (10) to at least two branch conveyors (20) arranged on a downstream of the stem conveyor (10) is disclosed. The divider mechanism comprises a sensing member (30), a controller (40), a shunting member (50), wherein, the sensing member (30) is located near the end of the stem conveyor (10), configured to generate a signal to the controller (40) when sensing an article (100) passing by a specified position; the controller (40) is configured to control the shunting member (50); the shunting unit (50) comprises a driving unit (51) and a guide unit (55) which is driven by the driving unit (51); the guide unit (55) is movably mounted on a downstream of the stem conveyor (10) to separate the articles (100) from the stem conveyor (10) to each branch conveyor (20) respectively, capable of swinging between a first position and a second position during an interval of the adjacent articles (100); when the guide unit (55) is at the first position, the article (100) is directed to the first branch conveyor (21); and when the guide unit (55) is at the second position, the article (100) is directed to the second branch conveyor (22). An article handling machine comprising the divider mechanism is also disclosed. Compared with the existing prior arts, the proposed solution is available for shunting high-speed products on the transportation line.
Abstract:
A method and a control system using the same for coordinating control of a plurality of wind turbines (10-15, 20-25, 30-35) of a wind farm (1) during a fault in a utility grid to which power is to be delivered via at least one cable (50, 51, 52) of the wind farm. The method includes: opening each of the electrical connections; selecting at least one wind turbine of the plurality of wind turbines according to a criteria where a sum of value for active power supply that is available from the selected at least one generator is equal or above a sum of values for active power consumption that is consumable by the energy storage system of the selected at least one wind turbine, the auxiliary equipment of the selected at least one wind turbine and the substation level auxiliary equipment; activating the selected wind turbine; for the selected wind turbine: electrically connecting the power input of its converter (101-151, 201-251, 301-351) to the power output of its generator (100-150, 200-250, 300-350), electrically connecting the power output of its converter to the power input of its auxiliary equipment, the power input of its energy storage system (106-156, 206-256, 306-356) and the corresponding cable, and electrically connecting the power input of a substation level auxiliary equipment (9) to the cable which is electrically connected to the selected wind turbine; the activated wind turbine acting as active power supply for the substation level auxiliary equipment. The method and the control system using the same provide an effective and economic way of using the power generated by the wind turbine generator for powering the auxiliary equipment of the wind turbine, charging the energy storage system of the wind turbine and powering the substation level auxiliary equipment, during the wind farm operates in an islanding mode.
Abstract:
A component feeder (1) comprises a container (3) for storage of components (5), a component supporting arrangement (10) comprising a component supporting member (12) and a component presentation surface (16), and a transfer arrangement (7) for transferring components from the container onto the component presentation surface. The component supporting arrangement (10) further comprises at least one cover member (14) arranged to cover at least a part of the component supporting member (12), and the at least one cover member (14) is configured to be exchangeable.
Abstract:
A calibration method for an expansion board to be used for modularized automation device is provided. The method includes: connecting the expansion board, a calibration device and a controller to a main board of the modularized automation device respectively; running a pre-stored script by the controller to obtain calibration parameters of the expansion board; and transmitting and storing the obtained calibration parameters into a non-volatile memory on the expansion board. A calibration system and a modularized automation device using the same are also provided.