205results about How to "Restore power" patented technology

A method and system restores power in a power distribution network. The network includes a plurality of power sources, a plurality of loading zones, a plurality of switching devices interconnected between the plurality of power sources and the plurality of loading zones, and an intelligent electronic device associated with each of the plurality of switching devices to control the switching devices. A base network state is defined and a power restoration logic is created for the base network state. A simulation is run for the power restoration logic and then the power restoration logic is transmitted to a power restoration controller which thereafter monitors and controls the intelligent electronic devices.

The invention relates to a method for restoring power supply of a power distribution network containing a distributed power source. The method is based on heuristic rules, performs dynamic island partition on the distributed power source, utilizes a connection switch to guarantee a power supply restoration scheme of the power distribution network to be adaptive to output changes of the distributed power source and continuous power supply of important users, and enables the intelligent power distribution network to operate safely, reliably and economically. Power supply restoration of the power distribution network comprises the steps that the power failure range of the power distribution network is determined by fault location information and an operating state of the power distribution network before the fault happens; and the distributed power source in the fault area is matched with the connection switch connected with the fault area, corresponding section switches are actuated, and radial operation of the power distribution network except for the distributed power source is ensured. The distributed power source is fully utilized to improve reliability of the power supply of the power distribution network, searching space is greatly reduced, and optimum strategy searching time is shortened. Therefore, the method is suitable for power supply restoration real-time operation of the power distribution network containing the distributed power source.

The invention provides a power distribution network dynamic power restoration method based on a load curve, which belongs to the technical field of power distribution system automation. The method utilizes a computer, realizes computing through programs and comprises the steps of inputting basic parameters; computing active load and reactive load of each node in each hour and determining a grid structure in normal operation; determining a fault section, a power supply path of the power side of the fault section and a grid structure after failure isolation; applying a traditional genetic algorithm to determine a candidate grid structure set of the least loss load in each hour during fault restoration; finally determining the optimum dynamic power restoration scheme during fault restoration. The method fully utilizes the load curve, and the dynamic restoration scheme is formulated by hour, so that the grid structure changes along with the change of the load during fault restoration, and accordingly, the method has the characteristics of being capable of effectively reducing power failure areas caused by fault, shortening power failure time for users, reducing the power failure loss of the users, and the like. The method can be widely applied to power distribution network power restoration.

The invention discloses a non-speed sensor slip speed-adjusting digital and intelligent speed-adjusting method and a system which comprises a motor, soft start equipment, a slip speed-adjusting, a slip power feedback and a programmable controller and is characterized in that: the slip speed-adjusting comprises a rotor rectifier, a chopper and a digital signal processor DSP1, exerts the dual-ring control of non-speed sensor speed measurement and the motor speed current, and transfers the slip energy to the electric energy; the slip power feedback comprises an inverter, a filter and a digital signal processor DSP2, exerts the dual-ring control of feedback circuit voltage current, and feedbacks the energy to a power net; the programmable controller exerts the whole system program control, and comprehensive fault and process. The invention is suitable for the common wire winding asynchronous motor and the inner-feeding wire winding asynchronous motor, and is characterized in using the low voltage device to control the medium voltage motor. Meanwhile, the invention has the advantages of simple circuit, good performance, perfect function, kind interface and simple and convenient operation.

The invention discloses an automatic-switching device system and method of a standby power source. According to the automatic-switching device system and method of the standby power source, the safety performance is high, faults of a bus are automatically judged, corresponding action strategies are executed according to fault point positions, the faults are isolated, and power supplying is recovered. The automatic-switching device system comprises an inlet wire M, an inlet wire N, the bus, a standby power source automatic-switching device and a segment combining unit, wherein the inlet wire M and the inlet wire N are connected with the bus, the bus is connected with the segment combining unit, the segment combining unit is connected with a collecting plate, and the collecting plate is connected with a protection plate and a management plate. The suitable running mode of an LBZT1 is that the inlet wire M serves as a standby, the inlet wire N runs and a segment switch serves as a standby. The suitable running mode of an FBZT is that the inlet wire M runs, the inlet wire N runs and the segment switch serves as a standby. By means of the automatic-switching device system and method, the safety performance of the device is improved, and power supplying can be recovered.

An apparatus comprises a controller for controlling operation of the apparatus and a switch for switchably coupling electrical power to the controller to enable the controller and apparatus to operate. The controller includes a module for controlling the switch to decouple electrical power from the apparatus, including the controller, and the apparatus further comprises a switch controller for controlling the switch to restore electrical power to the apparatus and controller a predetermined period of time after the switch decouples electrical power therefrom. The apparatus may be embodied in a line card of a communication system and the controller may comprise a control processor for controlling local operations of the line card.

The invention discloses a wide area self-adaptation spare power automatic switching method based on synchronous phasor measurement. By means of topology analysis, an association relationship between buses and lines is determined, a mode of operation of the lines and the buses is recognized, an initial operation state is recorded, faulty area, normal power supply area and area to be restored are determined, whether small power sources in a regional power grid are required to be immediately removed or not is determined, if the small power sources in the regional power grid are not required to be immediately removed, a spare power automatic switching power source is subjected to a quasi-synchronization grid connection, otherwise, all small power circuit switches in the area to be restored are tripped off, all non-fault working power source switches in a power-loss area are tripped off, and power restoration process is completed through circularly searching for power supply buses to be restored and closed corresponding line switches. According to the wide area self-adaptation spare power automatic switching method based on the synchronous phasor measurement, a centralized decision-making coordination mode which is specific to the integrated power grid is utilized so that a novel spare power automatic switching method has the advantages that the wide area is achieved, the method is capable of being self-adaptive to operation mode and the small power sources access to the power grid.

The invention provides an intelligent switch which comprises a load switch, an operating mechanism, a position state indicator, an upper disconnecting switch, a lower disconnecting switch, a current transformer, a first potential transformer, a second potential transformer, an electronic switch, a charging module, a battery and an intelligent device, wherein the load switch is connected on a main circuit and located between the upper disconnecting switch and the lower disconnecting switch; the electronic switch is connected with the load switch in parallel; the current transformer is sleeved on a branch circuit where the load switch is located; and the load switch and the electronic switch are connected in parallel. The first potential transformer and the second potential transformer are respectively connected with the charging module and can charge the battery from two sides; the intelligent device is connected to the current transformer and the charging module, and the battery can provide direct current supply for the intelligent device and the operating mechanism; the battery is connected with the charging module; the operating mechanism is connected with the load switch; and the indicator is connected with the operating mechanism. The invention also provides a control method of the intelligent switch.

The invention discloses an FCB operation method applied to a gas-steam set power plant. The method comprises: S1, a gas set and a steam set are set according to FCB operation requirements; S2, when afault occurs, a safety and stability control device issues a switching instruction to enter a FCB operating state; S3, a gas turbine enters the FCB operating state after receiving an FCB starting signal and the steam set enters the FCB operating state after receiving the FCB starting signal; and S4, after elimination of a grid fault, isolated island operation is implemented and then grid connection is carried out again. According to the method disclosed by the invention, when a fault occurs at an external grid, the power plant set is able to abandon all externally power supply loads instantaneously and disconnect the external grid, the steam set performs the coasting operation and keeps a vacuum state, and the gas turbine does not stop working, thereby keeping auxiliary power supply of thepower plant; and after grid fault elimination, the set carries the plant electric load and is connected with the external grid quickly and effectively to provide power for the system, so that other sets in the grid are activated rapidly and thus power is provided for the users again.

The invention discloses a watchdog division load switch. The watchdog division load switch is mainly composed of a breaker body, a fault detection controller and an external voltage transformer, wherein the breaker body, the fault detection controller and the external voltage transformer are electrically connected through an aviation socket and an outdoor sealing control cable. The aviation socket is fixedly installed at the bottom of the breaker body, and the breaker body comprises a casing, an upper cover, an inlet wire sleeve, an outlet wire sleeve, an insulating box installed in the casing, a vacuum arc-extinguishing chamber and an insulating operating mechanism. The insulating operating mechanism comprises an insulating pull rod, an operating spindle and a spring operating mechanism. Current transformers are respectively installed on two sides of an inlet wire conductive rod and an outlet wire conductive rod in the casing. The watchdog division load switch is simple in structure and reasonable in design, runs stably and is safe, reliable and suitable for division of a 10 kV overhead distributing line of a 10 kV system in neutral non-grounding, arc suppression coil grounding or low-resistance grounding and a user.

The invention relates to a high-reliability closed loop wiring method of a medium voltage distribution network. The method is characterized by comprising the following steps: S01, two independent buses are led out from the 10kv side of each transformer of a transformer substation; S02, the two buses are connected respectively through one looped network unit to form a closed-loop looped network structure, wherein each looped network unit is at least provided with a breaker to be used as an interconnection switch, and the closed-loop looped network structure formed by each transformer can be connected to the closed-loop looped network structure formed by the other transformer through the interconnection switches and an interconnection line; when each transformer normally runs, the breakers at the two ends of the interconnection line are both opened, the interconnection line is in the standby state, and the power supply load of each looped network does not exceed 40% of the power supply load of the thermal stability limits of two feedback lines. The method has the advantages that the power supply reliability is high, and the closed-loop operation of the same transformer can not increase the short-circuit current of a distribution network, so that the transformation amount is small, the construction cost is low, and the feasibility is high.

The invention relates to the technical field of electric power grids,and discloses an open fuse with a fusible core easy to replace. The open fuse comprises a shell,wherein the left end and the rightend of the shell are fixedly provided with a wire outlet port and a wire inlet port respectively,a rotating disc is hinged to the interior of the shell,and a rotating shaft matched with the shell is installed on the rotating disc; a rotating handle is arranged at the tail end of the rotating shaft,and detachable movable ceramic units are inserted in the upper portion of the rotating disc in an array at equal intervals. According to the open fuse,power can be quickly recovered through the rotating disc and a plurality of replaceable fuse wires installed on the rotating disc; besides,the time for replacing the fuse wires can not influence the electric power recovery speed; meanwhile,the replaceable fuse wire area is isolated from an internal circuit,and electric power accidents are avoided during replacement. The fuse can also be used as a switch blade,and can directly skip the fuse wires and be connected with the circuit so that various use occasions and emergency states can be effectively dealt with,the application range is expanded,and practicability is improved.

The invention relates to a self-excitation driving follow current control device which belongs to the technical field of DC power control. The device comprises a self-excitation oscillating circuit, arectification filtering circuit, a driving circuit and a VMOS switching circuit, wherein the self-excitation oscillating circuit mainly comprises a triode and an oscillating coil and is used for enhancing inputted low voltage to required high-frequency pulse voltage to output; the rectification filtering circuit mainly comprises a rectification diode and a filtering capacitor and is used for converting the inputted high-frequency pulse voltage into working voltage; the driving circuit mainly comprises a timer and a charging and discharging circuit and is used for outputting the inputted working voltage in definite time to driving control voltage with time intervals for driving a secondary circuit; and the VMOS switching circuit mainly comprises a VMOS device connected with a follow current diode in parallel and is used for switching assistant follow current according to preset time intervals under the drive of the inputted driving control voltage. The device can ensure that the powersupply of a battery pack is recovered when an individual battery fails, effectively prevent the follow current diode from being overheated simultaneously and prevent other batteries of the battery pack from being damaged.

The invention discloses a wide-area power network hierarchical protection and control system. The system comprises an acquisition control layer unit and a network protection layer unit which communicate with each other, wherein the acquisition control layer unit comprises an instation local data acquisition and control device, interstation remote data acquisition and control device and an instation onsite protection control device; and the network protection layer unit comprises two-layer protection of an interstation rapid differential protection device and an interstation and interstation time-delay differential protection device. The system has the following advantages: the system realizes hierarchical protection and control of a wide-area power network, enables instation protection control and wide-area protection control to form systematic cooperation, realizes rapid recovery of power supply and ensures power supply reliability.

The invention provides an in-put control method for standby powers of transformer substations. The method comprises the following steps: determining the connection form of a busbar according to a set logic two-dimensional table; determining the states of a circuit and a busbar tie/section switch before and after an automatic bus transfer device is logically started; under the condition of normal operation, when the circuit or the busbar tie/section switch in a standby supply station exists, permitting the automatic bus transfer device to charge; in the charging state, if starting conditions are met, starting the automatic bus transfer device after a delay; after the automatic bus transfer device is started in the charging state, performing corresponding actions according to action logic. The method can be suitable for different connection forms of transformer substations, can cover the connection form of the current transformer substation, and is not limited by any running way of the transformer substations. The method selects a standby switch which can be closed to transfer according to the determined automatic bus transfer priority order for the circuit and the busbar tie/section switch, and restores power supply of a no-voltage busbar to enable the no-voltage busbar to adapt to the demand of the current power grid.

The invention provides an electric leakage breaker, which is provided with a microprocessor (12). The microprocessor (12) is respectively and electrically connected with button switches (S2 and S3), an electric operation mechanism movement circuit, an electric leakage detecting circuit, a voltage detecting circuit, an encoding switch setting circuit, an actuating mechanism movement circuit and light-emitting diodes (13 and 17-21). The electric leakage breaker can adjust setting of the electric leakage parameters automatically and has functions of low-voltage protection and over-voltage protection.

The invention discloses a fault isolation and fault recovery method and system for a medium-voltage DC distribution network. A start end of a medium-voltage DC distribution line is provided with a DCcircuit breaker, and each segmented part of the line is provided with a load switch. The start end of the lien and each segmented part are provided with DC protection parts. A communication network isconfigured for the communication between the DC protection parts. When the medium-voltage DC distribution network has a fault, an overcurrent protection element of the DC protection part at the startend of the line operates, and a DC circuit breaker is switched off for eliminating the fault. After a fault current exceeds a fixed value, the DC protection part at each segmented part of the line transmits the fault current and the direction of the fault current to the adjacent DC protection part, and the DC protection part determines a fault point through the fault currents of the DC protectionpart and the adjacent DC protection part and the directions of the fault current, and then the DC protection part which is the nearest to the fault point operates, the load switch is switched off toisolate the fault. After the fault is isolated, the DC circuit breaker at the start end of line is switched on and the switch for power supply is switched on, so as to recover the power supply of a non-fault region.

The present invention discloses a planned island division method through load gradual loading and aggregation based on a network topology structure, comprising the steps of: during a fault, locking a fault area by using each power supply as a starting point and using a fault current or a directivity protection criteria as search driving, and performing fault isolation; after the fault isolation, performing microgrid island division through a load loading and aggregation method based on a network topology structure by using a fault isolation boundary tripped isolation switch as a starting point, using a flowing fault current as a search direction and using a power supply overload capability as driving. The load capability of a power supply is used as driving, load is gradually loaded and aggregated through layer-by-layer recursion, i.e. an inverse search method from roots to leaves, then an optimum trend balance point is found, thereby achieving the optimum island division. The planned island division method of the present invention is not according to the prior network definition, and is suitable for power distribution networks with any network topology structures; in addition, the planned island division method is not limited by a DG operation mode, and can be applied in the DG which can return to normal operation after fault isolation.