40results about How to "Get back up and running quickly" patented technology

This invention discloses a method for handling failure of alternating current side of invertor side of mixed-type direct current transmission system. The method is characterized by comprising the following steps: steps1, detect whether a serious failure is happened in an alternating current network of the invertor side; if so, enter the step 2; the serious failure means that the failure happened in the network of the invertor side makes the positive sequence voltage of the connection part of an inversion converter station and the alternating current network less than 0.6 time of a rated voltage; step2, shift the phase of a rectification converter station to an inversion state; in other words, adjust the trigger angle of a converter valve of a thyristor of the rectifier side to be greater than 90 degrees; and step 3, the voltage source type converter of the inversion converter station triggers a single-phase valve in three phases to run straightly and simultaneously locks the other two phases of valves. By adoption of this method, the mixed-type direct current transmission system can safely and reliably pass through the serious failure of the alternating current network of the invertor side; the overvoltage of the inner capacitor of the voltage source type converter and the overvoltage of the direct current side can be limited; and after the failure of alternating current network is cleared, the mixed-type direct current transmission system can be resumed quickly and steadily.

Provided is a fault identification and protection method of an electrified railway AT traction network. When network voltage is lower than a specified value, labeling no-load trend symbol values of the near ends and the far ends of a touch net T and a negative feeder F in each self-coupling segment with 0, labeling influent trend symbol values with 1, labeling effluent trend symbol values with -1, if an absolute value of a sum of the trend symbol values of two ends of the touch net T in each self-coupling segment is larger than or equal to 1, or a failure absolute value of a sum of the trend symbol values of two ends of the negative feeder F is larger than or equal to 1, or a failure absolute value of a sum of the trend symbol values of two ends of a touch net T branch and a negative feeder F branch is larger than or equal to 1, respectively judging the touch net T to be in short circuit failure to the ground, or the negative feeder F to be in short circuit failure to the ground, or the touch net T to be in short circuit failure to the negative feeder F, and breaking off all breakers at two ends of each self-coupling segment. Short-circuit reactance calculated according to corresponding voltage and short-circuit current at two ends of each self-coupling segment and the corresponding length of the self-coupling segment determine failure positions.

The invention discloses a snapshot-based application server remote boot method. In the method, creating multiple data copy snapshots of the source data trend of the application server in a backup server by using a snapshot technique, and proper snapshots in the backup server, when the application server goes down, are mounted to a local disc to boot a fault server through the Ethernet or a storage area network quickly so as to restore the normal application of the fault server. In the invention, the problem of the overlong system creation or restoration of a computer operating system having a fault and the problem of a failure in the representation of related serve, system configuration and registry information and the like in a new system and a failure in the normal operation of an application, which are caused by the inconsistency between a system for booting the application server and a system used by the application server before going down during the booting of a common remote operating system are solved, and the downtime and loss are reduced to a minimum degree.

The invention discloses a substation fault information automatic publishing and processing system. The system comprises a substation module, a dispatching data network, a command module, a fault information publishing management module and a user MIS network module, wherein the substation module is connected with the command module and the fault information publishing management module through the dispatching data network; the fault information publishing management module is connected with the user MIS network module; the system is characterized in that the substation module comprises a plurality of substations; each substation comprises an exchanger, a wave recorder, an inductor and a traveling wave distance measurement apparatus; and the wave recorder, the inductor and the traveling wave distance measurement apparatus are all connected with the dispatching data network through the exchanger. According to the system, fault information automatic publishing and information receiving and reading are facilitated; a fault position and a fault cause can be determined in time; the fault information can be effectively processed in time by cooperation with the processing system; the substation can be quickly recovered; and the safety running of the substation is ensured. The system has relatively good safety performance and meets actual usage requirements.

The invention relates to a frequency modulation method of a wind storage system based on double-layer cooperative control, and provides a two-layer cooperative control scheme for providing frequency modulation response for a flywheel energy storage cooperative MPPT operation wind turbine generator based on a cooperative control theory by starting from optimization of frequency response dynamic characteristics of the wind storage system. The frequency deviation and the virtual electrical inertia of the wind turbine generator are linearly combined to form a macro variable, and a variable proportion coefficient speed regulation strategy for cooperatively providing frequency support for the wind turbine generators with different wind speeds is designed. Further, based on the linear combinationof the frequency deviation, the energy storage frequency modulation power instruction and the virtual inertia of the wind turbine generator, a macro variable is formed, and an additional frequency modulation active adjustment strategy that flywheel energy storage cooperates with the wind turbine generator to provide frequency support, rapidly recover MPPT operation of the wind turbine generator and avoid frequency secondary disturbance is designed. The method is good in robustness, simple in control structure and easy to implement in engineering, the frequency modulation response effect of the wind storage system on the power grid can be achieved, and the active adjustment speed requirement of the synchronous generator participating in frequency modulation is lowered.

The invention belongs to the field of special materials of building materials, especially to a pavement thin layer rapid repair material, and the material is extensively applicable to concrete pavement thin layer rapid repair of projects like an airport, a road, a highway, a bridge, a port and a wharf. The pavement thin layer rapid repair material provided by the invention comprises the following raw materials by weight: 100 parts of an epoxy resin, 10 to 35 parts of a curing agent, 100 to 600 parts of fine aggregate and 100 to 500 parts of a toning modifier. The pavement thin layer rapid repair material provided by the invention has the following advantages and beneficial effects: high strength, fast development, excellent bond performance on cement concrete, a great adjustable scope of setting time, capacity of rapidly recovering use functions of a cement concrete pavement, excellent frost resistance and deicer scaling resistance, high abrasion resistance, high performance in protection of a steel bar from rust, small drying shrinkage, high crack resistance and adjustable colors in accordance with requirements.

The invention provides a control method under an automatic driving fault of a first train of a virtual coupling high-speed train. The method is characterized in that each single train is provided with a vehicle-mounted ATO module and a tracking control module, each path station is provided with a main track and a side track, and when the vehicle-mounted ATO module of the first train fails and cannot be automatically driven, a ground control system dispatches a manual control first vehicle to drive into the side track of the nearest path station, controls other tracking vehicles to drive into the main track, then drives the first vehicle to the rear of the last tracking vehicle of the main track, takes the forefront tracking vehicle as a new first vehicle, takes the fault first vehicle as the last tracking vehicle, and controls the other tracking vehicles to drive into the main track, and after a new virtual coupling is reestablished, normal operation is recovered. By adopting the control method provided by the invention, line operation can be quickly recovered, the influence of the fault on the operation line is reduced to the maximum extent, the loss caused by the fault is reduced to the maximum extent, the line operation cost is reduced, and the operation efficiency is improved.

The invention discloses a protection system for a voltage source type converter station, a protection control system and a protection method. A rapid switch mounted in front of a DC side capacitor is in matching with an AC breaker mounted at the back of the DC side capacitor, and rapid safe cut off of a fault line can be realized; when a short circuit fault occurs, a VSC transverter is rapidly isolated through the rapid switch, so damage to a freewheeling diode because of flowing in of a DC side fault current after discharging of the DC side capacitor can be avoided. After the rapid switch is opened, a second-order loop formed by the DC side capacitor and the fault line generates an oscillation current, so a current zero-crossing condition is provided for motion of the AC breaker, the fault current can be cut off by utilizing the low-cost AC breaker, and safety of the VSC transverter and a DC line is guaranteed.

The invention discloses an emergency switched system of NGN service platform database and a realizing method thereof. The system comprises local service databases of each city, back up databases of province emergency centers, a synchronization module and a switching module; wherein, the local service databases and the back up databases are corresponding to each other one by one; the synchronization module is used for completing the data synchronization between the local service databases on NGN service servers of each city and the province center back up databases on province emergency center servers; and the switching module is used for switching the province center back up databases which are corresponding to the city on the province emergency center servers into the local service databases when the NGN service servers of the city are out of service caused by the lock service database. The invention sets up the back up databases on the province emergency center servers, when the local service databases can not be immediately recovered, switches the databases in a connecting way, and accesses the province center back up databases by a synthetic data communication network, so as to fast recover the operation of the system, greatly shorten service interruption time, and minimize the influence to customers and operators.

The invention discloses a current-limiting resistor-capacitor branch circuit, a resistor-capacitor type direct current circuit breaker and a control strategy which are suitable for a high-voltage direct current electric power transmission system. The current-limiting resistor-capacitor branch circuit comprises a first sub-circuit and a second sub-circuit; and on the basis of the current-limiting resistor-capacitor branch circuit, a current-carrying disconnection branch circuit is increased to form the resistor-capacitor type direct current circuit breaker provided by the invention. Meanwhile,the new control strategy is provided for the resistor-capacitor type direct current circuit breaker. Through the current-limiting resistor-capacitor branch circuit, the resistor-capacitor type directcurrent circuit breaker and the control strategy, after a direct current line goes wrong, an over-current of a direct current can be inhibited, a direct current voltage can be stabilized, the breakingcapacity is strong, and the stability and reliability of an alternating current and direct current system are improved.

The invention provides an active photovoltaic string direct-current arc fault detection and fault positioning system and method. The system comprises a high-frequency signal generation and injection device, a line signal measuring instrument and an arc fault analysis module. According to the invention, the arc fault position is accurately positioned; fault troubleshooting and rapid operation recovery of a photovoltaic power station are facilitated, the influence of an inverter, field cable wiring and an operation environment on arc fault detection and fault positioning precision is reduced, and the defects that a method for detecting voltage and current characteristics in a conventional passive detection mode is prone to external interference, the arc fault detection precision is low and the misjudgment rate is high are overcome.

The invention relates to a direct current disconnector and a harmonic current break device thereof. The direct current disconnector includes a fixed contact and a conductive knife switch, the conductive knife switch includes an upper contact tube, a static side arc strike assembly is arranged on the side, close to the conductive knife switch, of the fixed contact, and a dynamic side arc strike assembly is arranged on the upper contact tube. The static side arc strike assembly comprises a static side arc strike seat and a self-resetting arc strike rod, and a static side blocking piece is arranged on the side, back to the conductive knife switch, of the self-resetting arc strike rod. The dynamic side arc strike assembly comprises a dynamic side arc strike seat and a self-resetting arc strikearm, the swinging plane of the self-resetting arc strike arm is perpendicular to the swinging plane of the self-resetting arc strike rod, and a dynamic side blocking piece is arranged on the side, close to the fixed contact, of the self-resetting arc strike arm. The self-resetting arc strike arm is provided with a conductive end for being in conducting contact with the self-resetting arc strike rod and intersecting with the swinging plane of the self-resetting arc strike rod, and the hinged part of the self-resetting arc strike arm is located on the outer side of the swinging plane of the self-resetting arc strike rod. Compared with the prior art, a main contact of the disconnector is not prone to being ablated by harmonic current.

The invention discloses a method for hanging a wheel set of a locomotive vehicle. The failed wheel set is separated from a rail through the vertically upward support force supplied by a jack, is in a hung state over the rail and then tightly tied to a running gear bogie through an auxiliary fastening device, a support device is installed on a normal wheel set adjacent to the failed wheel set, therefore, the running gear bogie is in an inclined state to share the pressure of the whole locomotive vehicle on the running gear bogie, and then the locomotive vehicle can run at low speed in the state that a failed wheel is hung.

The application provides a high-voltage power transmission line fault monitoring system which comprises a plurality of monitoring devices, a signal relay device, a signal receiving device and an alarm device. Each monitoring device is arranged on a high-voltage power transmission line between power poles and comprises a fault monitoring unit, a control unit and a radio transmitting unit. The fault monitoring unit is used for monitoring the fault of the high-voltage power transmission line and sending the monitored fault information to the control unit. The control unit is used for receiving the fault information and sending the fault signal through the radio transmitting unit. The signal relay device is used for forwarding the fault signal. The signal receiving device is disposed in a transformer station, is connected with the alarm device, and is used for receiving and analyzing the fault signal to obtain the fault information and the identification information of the monitoring device, determining a fault location according to the identification information of the monitoring device, controlling the alarm device to prompt the fault information and the fault location. The high-voltage power transmission line fault monitoring system is not controlled by a communication operator, can reduce fault monitoring cost and shorten the time for searching for the fault location.

The invention discloses a stacker alarm device and equipment. The stacker alarm device comprises a controller, a detection module and an alarm information display module, the controller is connected with the detection module and the alarm information display module and is used for triggering alarm according to the data transmitted by the detection module; the alarm information display module is used for displaying alarm information; the controller comprises an alarm grouping unit, an alarm classification unit and an alarm information caching unit; the alarm grouping unit is used for grouping all alarm information triggered by the controller; the alarm information classification unit is used for classifying all the grouped alarm information; the alarm information cache unit is used for storing all alarm information and historical alarm information. According to the method and the device, the technical problem that the processing efficiency of the fault event prompted by the alarm is influenced because the historical alarm data is not stored and the efficiency of analyzing the fault reason for the user is not high in the prior art is solved.

The invention discloses a novel spiral classifier lower supporting device which comprises a shaft head and a lower supporting seat. A square hole cavity is formed in the lower supporting seat, a shaft sleeve is mounted on the shaft head, and the shaft sleeve and the shaft head are fixed together through a fastener and a bolt. Mutual abrasion of the lower shaft head and the lower supporting seat of a classifier can be effectively avoided, failure is greatly decreased, the shaft sleeve and wear-resistant packing are conveniently replaced, downtime of the spiral classifier can be greatly shortened, and maintenance cost is reduced.

The invention discloses a multi-link SVG power module, which comprises an SVG power module and a bypass switch. The SVG power module is formed by connecting a plurality of H-bridge inversion units in series, and the main contact of the bypass switch is connected with the output end of the SVG power module in parallel; only one H-bridge inversion unit in the SVG power module is connected with a closing coil of the bypass switch; when any H-bridge inversion unit of the multi-link SVG power module has a fault, a controller of the whole set of SVG device controls an H-bridge inversion unit connected with a closing coil of the bypass switch in the fault SVG power module to control the bypass switch to act, so that the whole multi-link SVG power module is bypassed; and according to the multi-link SVG power module, bypass control is carried out on the H-bridge inversion units through the bypass switch, a bypass control loop is greatly simplified, the cost is saved, operation of the SVG device can be rapidly recovered after bypass is carried out on the fault H-bridge inversion unit, and the loss is reduced.