Abstract:
A protection apparatus is connected to an end effector which has a casting (9), a fixed part (5) fixed to the casting (9), a rotational part (4) rotatable relative to the fixed part (5), and a sealing part (1) provided in a circumference of the rotational part (4). The protection apparatus comprises a cover (2'), an annular elastically deformable sealing member (3) and a fixing member (10); therein the sealing member (3) is partly accommodated between the cover (2') and the rotational part (4); the cover (2') is attached to the fixed part (5), the cover (2') being adapted to cover the exterior of the fixed part (5) by the fixing member (10), so as to prevent the fixid part (5) from being exposed to an exterior; and the cover (2') and the sealing memver (3) are configured to jointly cover the sealing part (1) so as to prevent the sealing part (1) from being exposed to an exterior. It also provides an end effector an a robot. Compared with the existing prior arts, the proposed solution is compacted and easy to assemble.
Abstract:
The present invention provides a method of determining an electrical operating time of a circuit breaker (140) in a multiphase electrical system having a subsystem (160) at an electric potential resulting from electrical characteristics of electrical components within the subsystem. The method comprises monitoring (145) the voltage of the subsystem in the first phase, determining a first rate of change from the monitored voltage in the first phase, detecting at least one instance of switching based on the first rate of change, determining an electrical operating time of the circuit breaker based on the detected at least one instance of switching and an instance at which a command for switching was provided to the circuit breaker.
Abstract:
A method and a device for ensuring execution of a plant process in a distributed control system during a network attack are disclosed. The networked plant includes an engineering workstation, an operations workplace, and a plurality of input/output (IO) points configured to communicatively couple with a controller. Based on the traffic of the network at the controller, the priority of the communication receive tasks are modified. Further, anomalous condition is determined based on the actual and estimated schedule time of a low priority consumer task and a corrective action is taken.
Abstract:
The present disclosure relates to a valve unit (200) of a power converter station. The valve unit comprising at least one compartment delimiting an interior space (150) and at least part of at least one power converter (280) arranged within the interior space. A wall (105) of the compartment comprises an at least partially electrically- conductive inner layer (110) facing the interior space and an at least partially electrically-conductive outer layer (120). An insulating material (130) is arranged between the outer layer and the inner layer. The compartment is at least partially filled with a gas including air and includes at least one port (160) for access to the interior space.
Abstract:
A DC grid current differential protection method and system are provided. The method includes: sampling value acquiring step (S301): acquiring pole voltage and current sampling values in local and remote terminal of a DC line; fault component extracting step (S302): calculating fault component pole voltage and current values according to the pole voltage and current sampling values of local and remote terminal respectively; Bergeron model calculating step (S303): acquiring fault component pole current values at selected point on the DC line between the local and the remote terminal, by the calculation of the fault component pole voltage and current values of local and remote terminal calculated in the fault component extracting step, based on Bergeron model; current differential protection judging step (S304): judging internal fault if the fault component pole current values at selected point meet preset current differential protection criterion. Because of adopting Bergeron model, it improves the calculating speed.
Abstract:
A method and controller for controlling capacitor voltage balancing in a modular direct-current to direct-current (DC/DC) converter. The method comprises in each of sub-process of a voltage transitional process of a square wave for an arm: S701: identifying candidate sub-modules in a predetermined status from sub-modules in the arm; S702: obtaining capacitor voltages of the candidate sub-modules; S703: selecting at least one target sub-module from the candidate sub-modules based on the obtained capacitor voltages; and S704: generating a control signal to the at least one target sub-module in the arm so that a voltage across the arm changes gradually in the voltage transitional process. Using the above method, well-balanced capacitor voltages can be provided, which could provide a square waveform with a voltage changing gradually in the voltage transitional process at corresponding arm and at the same time meet requirements on the arm current by a soft switching. Therefore, the switching loss can be reduced even at a higher switching frequency and thus the system efficiency can be improved.
Abstract:
A method for coordinating control of a wind farm (1) during black start of islanding operation, including: selecting a conductor in the wind farm (1) via which the external generator (9) is electrically connectable to auxiliary equipment of at least one wind turbine(10-15, 20-25, 30-35) of the wind farm (1) to deliver the active power to the auxiliary equipment of the wind turbine (10-15, 20-25, 30-35), wherein the selected conductor is electrically connectable to a converter (101-151, 201-251, 301-351) of the wind turbine (10-15, 20-25, 30-35); and choosing at least one of the wind turbines (10-15, 20-25, 30-35), wherein a converter (101-151, 201-251, 301-351) of the chosen wind turbine (10) can absorb a portion of an amount of reactive power generated by the selected conductor when voltage is applied between at least two parts of the selected conductor; operating an external generator (9) in an operation region around power limit curve to output energy; electrically connecting the output of the external generator (9) and the auxiliary equipment of the wind turbine (10-15, 20-25, 30-35) via the selected conductor; electrically connecting the output of the external generator (9) and the chosen wind turbine (10-15, 20-25, 30-35) converter via the selected conductor; and absorbing by the external generator (9) and the chosen wind turbine (10-15, 20-25, 30-35) converter (101-151, 201-251, 301-351) the reactive power generated by the selected conductor so that an operation point of the external generator (9) is kept within the operation region around the power limit curve. By having the method,the external generator's available capacity can be fully utilized.
Abstract:
A method and apparatuses for handling delayed zero crossing in fault current through a circuit breaker (110) are disclosed. An interface arrangement (100) is configured to couple an alternating current, AC, power system (102) with a direct current, DC, power system (103), or vice versa. The interface arrangement (100) comprises at least one converter (104, 105, 108) for conversion of AC power to DC power, or vice versa, which comprises a DC side for coupling of the converter (104, 105, 108) to the DC power system (103) and an AC side for coupling of the converter (104, 105, 108) to the AC power system (102). A circuit breaker (110) is arranged in a current path between the AC side of the at least one converter (104, 105, 108) and the AC power system (102). There may be a risk of delayed zero crossing in fault current occurring in case a fault occurs in a predefined portion of the interface arrangement (100). If a fault is sensed to occur in the interface arrangement (100) within the predefined portion of the interface arrangement (110), opening of contacts of the circuit breaker (110) can be delayed by a selected delay time period, compared to if the fault would have been within a portion of the interface arrangement (100) different from the predefined portion.
Abstract:
A control system for an electric vehicle charging station (EVCS) is provided, the control system comprises: a central controller configured to receive an ancillary service order from a power grid and distribute the ancillary service order to one or more local controllers periodically; and the one or more local controllers configured to control a plurality of electric vehicle supply devices based on the distributed ancillary service order in real time. The method controlling the electric vehicle charging station (EVCS) is also provided.
Abstract:
The present invention relates to a control unit (1) comprising control equipment (8) for controlling a machine (5), an antenna (4) for wireless communication with a remote unit, a cabinet (2) encapsulating the control equipment and provided with a handle (3) arranged on the outside of the cabinet. According to the invention, the antenna is arranged in the handle.