148results about How to "Guaranteed continuous power supply" patented technology

The invention discloses a high-accuracy arc extinguishing coil grounding system single-phase grounding wire selection method. The method comprises the steps of parallelly connecting a series loop which is composed of a grounding resistor and a circuit breaker with two ends of an arc extinguishing coil, wherein in normal operation, the circuit breaker is in an on state; additionally mounting a zero-sequence current transformer on each outlet wire of a transformer station without the zero-sequence current transformer; in single-phase grounding, acquiring the zero-sequence current of the zero-sequence current transformer by means of an existing microcomputer protecting device of a transformer substation, when flowing zero-sequence current is larger than a setting value Izd0, transmitting a fault signal after setting time T1, and determining a faulted line; and when the zero-sequence voltage of a bus voltage transformer increases to a certain value Uzd0, determining single-phase grounding, and performing tripping-out on the circuit breaker which is serially connected with the grounding resistor after a time period T2. The high-accuracy arc extinguishing coil grounding system single-phase grounding wire selection method has advantages of realizing simple reconstruction, greatly improving wire selection accuracy on the condition that safe and stable system operation is not affected, reducing economic loss caused by wire selection error and ensuring continuous electric power supplying to electric power users.

The invention discloses an intelligent DC power distribution center-based urban distribution network grid structure, which comprises more than two groups of 10KV back-to-back multi-terminal DC power distribution systems, wherein each 10KV back-to-back multi-terminal DC power distribution system comprises an AC/DC converter and a DC/AC converter; four shutdown switches are connected between the AC/DC converter and the DC/AC converter in series; adjacent 10KV back-to-back multi-terminal DC power distribution systems are connected with each other through a sixth shutdown switch and a seventh shutdown switch; the sixth shutdown switch is connected between output ends of the first shutdown switches of the adjacent 10KV back-to-back multi-terminal DC power distribution systems; the seventh shutdown switch is connected between the output ends of the third shutdown switches of the adjacent 10KV back-to-back multi-terminal DC power distribution systems; and the input ends of the converters are connected through four groups of feeders connected with interconnection switches to form the grid structure. The technical problem that the prior art cannot adapt to a complicated power system, and especially the technical problems in the aspects of reliability improvement, control power flow adjustment, distributed power supply connection and the like are solved.

The invention discloses a distributed generation-based grid connection transition operation mode coordination comprehensive protection method. When the DG capacity is continuously increased, the short-circuit current level is improved, the DG is changed from a "pure load" into a "small power supply", and a problem that conventional protection and switching breakpoints cannot meet the transition condition is solved. Based on the conventional protection and the switching breakpoints, the scheme provided by the invention performs continuous matching with a primary operation model and is continuously optimized, and the information and the state quantity are continuously exchanged to form a protection control interface adapted to a primary system, so that dual purposes of safe operation of a system and continuous power supplying are achieved. The fault isolation range is determined by collecting a new boundary which is determined by the switching breakpoints, and that whether the system sectionalizing and the island operation mode generated as a boundary point is determined is stable or not is comprehensively considered.

The invention relates to an intelligent household microgrid system based on a technology of internet of things. The intelligent household microgrid system includes an energy system and a control platform thereof. The energy system includes a photovoltaic cell, a chopper module, an energy storage device, a rectifying module and a PCC (point of common connection) switch. The control platform includes a CPU, a storage module, a ZigBee wireless networking device (full-function ZigBee (FFD) main coordinator, a local ZigBee universal remote controller, and a reduced-function (RFD) ZigBee terminal node) and a peripheral interface. The control platform of the intelligent household microgrid system also includes a cloud computation background service system in the broad sense. The intelligent household microgrid combines intelligent grid, microgrid and internet of things technologies and one of great characteristics of the intelligent household microgrid is that a ZigBee wireless technology is introduced to the household microgrid so that the system is capable of networking flexibly. The intelligent household microgrid system is combined with a peak-valley electrovalency system to realize functions such as reliable power supplying through combination of self generation and grid power, intelligent scheduling of distributed photovoltaic power generation, intelligent charging and discharging of the storage device under different states, power bidirectional flowing between the system and the grid, real-time visualization of electricity quantity information and automatic switching of grid connection and grid isolation and the like.

The invention relates to a ship DC integrated power propulsion system and a protection design method of the system, and solves the problem that the existing protection methods cannot achieve selectiveprotection of DC integrated power systems. The protection of each frequency conversion module of the DC-side busbar uses fuses as protection devices, and the protection of the generator and its output-side cables is achieved by detecting the imbalance of phase-to-phase current or phase-to-phase voltage by a self-developed generator protection device. In the case of a short-circuit fault of the DCbusbar itself, the invention proposes two protection schemes based on a fuse with an isolating switch and a solid-state circuit breaker. The protection of the propulsion motor and the load-side equipment can be realized by an inverter unit, and the DC system protection design scheme is realized by the methods such as insulation detection in conjunction with a comprehensive control system for theground fault, so that the non-fault side busbar can continuously power while the short-circuit fault is accurately and quickly removed, thereby realizing the system protection selective scheme and ensuing the reliability and safety of the power supply of the ship's power system.

The invention discloses a grid-connected seamless switching controller based on a capacitive current inner ring and a control method thereof. The controller comprises a microcontroller, a voltage sampling circuit, a grid-connected switch driving circuit and an inverter power tube driving circuit, wherein the microcontroller comprises an electricity grid synchronous module, an output voltage controller, a capacitive reference current generator under a grid-connected mode, a grid inlet current controller, a capacitive current controller, a control command selecting switch and an inverter power tube logic generator. The grid-connected seamless switching controller is connected with an inverter of an electricity grid through a grid-connected switch, is in an output voltage control mode when in dependent operation with load and is in a grid inlet current control mode when in grid-connected operation. The grid-connected seamless switching controller is adaptable to a grid-connected inverter capable of independently operating with grid-connected double modes, increases output voltage load adjustment rate under an independent mode, increases power factors and grid inlet current waveform quality on the condition of non-linear load and electricity grid voltage distortion under a grid-connected mode, and then realizes seamless switching of two work modes.

The invention discloses a circuit for soft startup and soft shutdown. The circuit comprises a positive (P)-channel metallic oxide semiconductor field effect transistor (MOSFET), a negative (N)-channel metallic oxide semiconductor field effect transistor (MOSFET), an isolating component, an input input/output (I/O) port and an output I/O port, wherein the source of the P-channel MOSFET is connected with an external power supply; the grid of the P-channel MOSFET is connected with the external power supply through a first resistor; the drain of the P-channel MOSFET is connected with a system power supply; the source of the N-channel MOSFET is grounded; the grid of the N-channel MOSFET is grounded through a second resistor; the drain of the N-channel MOSFET is connected with the grid of the P-channel MOSFET; the first electrode of the isolating component is connected with the grid of the P-channel MOSFET; the second electrode of the isolating component is connected with the system power supply through a fourth resistor; the third electrode of the isolating component is grounded through a power button; the input I/O port is connected with the second electrode of the isolating component; and the output I/O port is connected with the grid of the N-channel MOSFET through a third resistor. The startup/shutdown control process of the circuit comprise the following steps of: detecting whether the input I/O port is in a low-level state or not; if the input I/O port is in a high-level state, finishing the process; and if the input I/O port is in the low-level state, setting the output I/O port in the high-level state or in the low-level state. Thereby, the circuit can ensure that power is cut off completely when a system is shut down and no standby current exists.

The invention relates to a medium-low-speed magnetic levitation train suspension redundancy control system. The system comprises four suspension electromagnet magnetic poles arranged on an electromagnet on one side of a suspension frame, two suspension sensors arranged on the two sides of the electromagnet, four suspension choppers correspondingly connected with the four suspension electromagnet magnetic poles one to one, and suspension controllers connected with the suspension choppers respectively, wherein the suspension controllers are connected with the two suspension sensors respectively.Compared with the prior art, the system is high in practicability and has the beneficial effect that the reliability and stability of a suspension system are improved.

The invention provides an electrical equipment remote monitoring system, comprising electrical equipment, an on-line temperature monitoring device of the electrical equipment and a power distribution protection device. The on-line temperature monitoring device and a switchgear intelligent control device are in connection with a central controller; the on-line temperature monitoring device monitors the temperature data of the electrical equipment in real time, and transmits the temperature data to the central controller; when the temperature data exceeds a preset threshold value, the central controller controls the power distribution protection device to cut off the power supply of the electrical equipment. The electrical equipment remote monitoring system can effectively realize power distribution protection and on-line temperature monitoring, protect electrical equipment balance operation, and avoid potential safety hazards.

The invention discloses a PEMFC (proton exchange membrane fuel cell) emergency power supply system, which is designed for solving the problems that the existing emergency power supply is short in continuous power supply time and can not provide charge recovering on emergency occasions, and a gasoline generator is bulky and large in noises and releases harmful gases. The system disclosed by the invention comprises a system controller, a PEMFC, a fuel cell controller, a DC/DC (direct current) conversion circuit, a lithium battery and a charging and battery management system, wherein the fuel cell controller is used for carrying out controlling and monitoring on the PEMFC, and transmitting information to the system controller through a CAN (controller area network) bus; the DC/DC conversion circuit is controlled by the system controller, and connected to a load by the PEMFC, and the load is controlled by the system controller; the lithium battery is connected between the PEMFC and the load; and the charging and battery management system is controlled by the system controller and controls the operating state of the lithium battery. The emergency power supply system supplied power jointly by the PEMFC and the lithium battery can ensure the continuous power supply during a hydrogen storage vessel replacement period; and the system is long on continuous power supply time and noiseless, and has zero discharge.

The invention relates to the field of power, in particular to a method for wind generation and device thereof. The method includes the steps of: firstly compressing air into an air storage container, using the high-pressure air in the air storage container to drive a turbine and achieving the wind generation by a generator driven by the turbine. An air compressing system is arranged between a blade transmission set and a generator set, namely, the kinetic energy from the rotation of the blade is converted into the compressed air by an air compressor to be stored; then the compressed air in the air storage container of the air compressor drives the generator set to rotate to achieve the generation, so that the power of generation can be stabilized greatly through the adjustment of the air outlet valve of the air storage container, the adjustment of the brake and rotary speed of the blade can be realized through the configuration of the air compressing system and the like. The air can be stored when the wind is heavy or released when the wind is light, thus the wind generation is not limited by the wind power any more.

The invention relates to a DC power distribution network multi-function fault current controller and a control method. The multi-function fault current controller is formed by a series convertor loop(1) and a parallel convertor loop (2). The series convertor loop (1) is formed by an NPC full-bridge circuit, an LCL filter, a DC capacitor and a DC bleeder resistor. The parallel convertor loop (2) is formed by an NPC three-level DAB circuit. Under a stable state, the fault current controller can compensate circuit voltage surge, sag and pulsation; and under a fault state, the fault current controller can provide current-limiting inductance and backward voltage, thereby comprehensively realizing multiple functions of voltage regulation of a DC power distribution network and current limiting and blocking of the fault current, and improving use efficiency of the fault current controller.

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 geological disaster monitoring and early warning device. The geological disaster monitoring and early warning device comprises a front-end field monitoring device which transmits data to a data processing cloud platform through a GPS private wire network, the data processing cloud platform is connected with an early warning management unit, the front-end field monitoringdevice comprises a solar power supply mechanism and a geological monitoring mechanism, and the solar power supply mechanism provides power for the operation of the geological monitoring mechanism; thegeological monitoring mechanism comprises a protective hollow box and a data collecting unit installed in the protective hollow box, the protective hollow box is provided with a double-layer vacuum rubber pipe, the double-layer vacuum rubber pipe is provided with a plurality of branch pipes, the double-layer vacuum rubber pipe and the branch pipes are internally provided with data transmission signal lines respectively, and the tail ends of the data transmission signal lines are connected with a geological disaster monitor. The efficient stability of the monitor in operation and the consistency of monitoring positions are ensured, the accuracy of collection and processing of monitoring data in the later period is improved, and the occurrence of disaster prediction errors is avoided.

The invention relates to a wave power generation device, which mainly makes use of buoyancy of seawater and thrust of waves to drive buoys to swing vertically, so as to produce driving force, and then the vertically swung driving force is converted into one-way output power through a reverse mechanism, the power is transferred and amplified by a speed increaser and is further transferred to a power wheel by an output end; while two ends of a rotary shaft of the power wheel are provided with flywheels, and a rotating wheel for transferring power is arranged on a rotary shaft so as to transmit the power to a power generator. The wave power generation device adopts a simple and convenient structure to realize conversion of natural resources, and convert the thrust brought by the natural resources into power, thus, the resources can be utilized continuously, the structure is simple, and the implementation cost is low. In addition, the rotating wheel is arranged on the rotary shaft of the wave power generation device to correspondingly transmit the excessive power to an air compressor, the air compressor drives an air motor by storing air to aid transmission power wheels, thus, power can be generated during slack tide of waves, and continuous power supply by the wave power generation device can be ensured.

The invention relates to a control method for combined selection and shedding of feeder loads in the overload process of a power line or a power transformer. The control method is characterized by including the following steps that firstly, according to the different overload degrees of the power line or the power transformer, five rounds of load shedding are set; secondly, the overload starting condition of the power line or the power transformer is defined; thirdly, the overload action selection and shedding condition of the power line or the power transformer is defined; fourthly, overload action selection and shedding of the power line or the power transformer are executed. The novel control method for combined selection and shedding of the feeder loads is used for reducing load losses as much as possible while continuous power supply to important users is guaranteed and guaranteeing safe and stable operation of a power grid. According to the control method, multiple independent round levels are set according to the magnitude of currents and overload time delay of the power line or the power transformer, a fixed current value and a fixed time delay value which are independent are set for each round level, the fixed values are set in an inverse time limit mode, and load selection and shedding are accelerated when overload is severe.

The invention discloses an online detection bench for a gearbox and a detection method. At present, the traditional automobile gearbox detection load side is mostly energy-consuming load, and energy recycling cannot be achieved. The online detection bench for the gearbox comprises a touch screen (1); the touch screen is connected with a programmable logic controller PLC (2) and an RS232/CAN communication converter (21) through Ethernet and an RS232 serial port line respectively; the PLC is respectively connected with a water cooling system (3) and an oil cooling system (4) through a control line; the oil cooling system is connected with the gearbox (10) through an oil cooling circuit; the water cooling system is connected with a load motor controller II (5) and a load motor II (8) respectively through a water cooling circuit; the load motor controller II is connected with a DC power supply (13) through a bus; and the DC power supply is connected with a driving motor controller (17) anda load motor controller I (16) through a bus. Thus, the online detection bench for the gearbox is disclosed.

The invention discloses a shore power supply system for ships and a power supply method thereof. The shore power supply system comprises a transformer, power load for land, and power load for ships, wherein the low-voltage side of the transformer is grounded through a grounded circuit breaker and a grounded impedance which are connected in parallel; the power load for land and the power load for ships are connected in parallel and are connected with the low-voltage side of the transformer; a circuit breaker of the power load for land is arranged between the power load for land and the transformer; a circuit breaker of the power load for ships is arranged between the power load for ships and the transformer; and the grounded circuit breaker and the circuit breaker of the power load for land are interlocked. When no ship pulls in the shore to use the shore power supply system, the grounded circuit breaker is switched on, so that the grounded impedance is in short circuit, and the shore power supply system supplies power to the power load for land; and when a ship pulls in the shore to use the shore power supply system, the circuit breaker of the power load for ships is switched on, the grounded circuit breaker is switched off, the shore power supply system is grounded through the grounded impedance, and the power load for land and the power load for ships share the same shore power supply system. The shore power supply system has the advantages of rapid switch of power supply modes, reliable work, comprehensive protection means, and capacity of improving the utilization efficiency and working security and stability of the shore power supply system.

The invention relates to a fault current controller of a DC power distribution network. The fault current controller comprises a filtering loop, a series converter loop and a parallel converter loop,wherein the filtering loop comprises an LCL filter, the series converter loop comprises a full-bridge circuit, and the parallel converter loop comprises a DC/DC circuit. Under a steady-state condition, the fault current controller can be used for compensating temporary rising and temporary reduction of a voltage of a circuit and pulse; and under a fault condition, the fault current controller canbe used for providing current-limiting inductance and a reverse voltage, voltage adjustment of the DC power distribution network is comprehensively achieved, various functions of fault current limiting and blocking is achieved, and the application efficiency of the fault current controller is improved.

The invention provides an energy-harvesting power generation apparatus based on vibration of an inhaul cable of a cable-stayed bridge. The energy-harvesting power generation apparatus comprises a rope-shaped energy-harvesting power supply apparatus, wherein the rope-shaped energy-harvesting power supply apparatus is spirally wound around the inhaul cable of the cable-stayed bridge, and can vibrate along with the inhaul cable. The electric energy generated by the power generation apparatus can fully supply enough power to a monitoring system, a damping system, an illumination apparatus, traffic signs and the like on the bridge structure; the energy-harvesting power generation apparatus is also equipped with an electric energy storage apparatus; when surplus electric energy is generated, the surplus electric energy can be stored in time so as to ensure the continuous power supply of the system; and therefore, a brand new environment-friendly and green energy is supplied to the common cable-stayed bridge structure in highways and urban bridges.

The invention relates to a glass cleaner and a control method thereof, in particular to a glass cleaner with double power sources and a control method thereof. The cleaner comprises a cleaner main control part, a walking part, a cleaning part and a power supply part; the power supply part comprises a main power source, a main-power-source discharging current detection circuit, a main-power-source voltage detection circuit, an emergency power source, an emergency-power-source discharging current detection circuit, an emergency-power-source voltage detection circuit, a main control single-chip microcomputer, a double-power-source selector switch module and the like. The control method includes the steps that current data and voltage data of the main power source are detected through the main-power-source discharging current detection circuit and the main-power-source voltage detection circuit respectively, the data is compared with a set current threshold value and a set voltage threshold value through the main control single-chip microcomputer, and whether the emergency power source is switched on through the double-power-source selector switch module or not is determined. By means of the glass cleaner and the control method, automatic switching of the double power sources can be achieved, continuous power supplying of the glass cleaner is guaranteed, the requirements of the large-area cleaning process of the glass cleaner can be met, and the glass cleaner has the advantages of being environmentally friendly in cleaning, high in intelligent degree and the like, and is easy to apply and popularize.