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30results about How to "Avoid load loss" patented technology

Device and method for controlling the position for working devices of mobile machines

The invention relates to a device for controlling the position for work devices (41) of mobile machines (40). The inventive device comprises a measuring device (1,2) for measuring an angle (α) which is formed between a level (42) that is determined by the position of the work device (41) and the direction of the gravitational force (g). The inventive device also comprises an angle transmitter (5) for predetermining an angle (α′) which is formed between a level (42) that is determined by the position of the work device (41) and the direction of the gravitational force (g). The inventive device further comprises a controller (3, 4, 6–16) for controlling the angle (α) between the level (42) of the work device (41) and the direction of the gravitational force (g) in such a way that the measured angle (α) matches the predetermined angle (α′).
Owner:HYDROMATIK GMBH

Direct current power prompt drop method and system based on new energy field station power loss amount accurate perception

The invention discloses a direct current power prompt drop method and system based on new energy field station power loss amount accurate perception. The method comprises the following steps that a fault monitoring substation sends power grid fault information to a coordinated control main station and a new energy control substation; the new energy control substation receives the power grid faultinformation and then sends the information to a new energy field station concentration management and control system; after receiving the power grid fault information, the new energy field station concentration management and control system calculates the total amount of new energy off-line active power from the information fed back by a new energy collection terminal; the new energy field stationconcentration management and control system sends the new energy off-line active power amount of the field station to the new energy control substation; and after the coordinated control main stationcalculates the total amount of the new energy off-line active power of the whole power grid, and a power grid execution station receives a prompt drop direct current power control command, prompt drop direct current power control is implemented. The method and the system are beneficial to frequency stability emergency control after a large-scale off-line state of a new energy unit, and are beneficial to ensuring the high proportion of the new energy and the safe and reliable operation of the power grid.
Owner:NORTHWEST BRANCH OF STATE GRID POWER GRID CO +1

Device for cultivating algae and/or microorganisms for treating an effluent, and biological frontage

The invention relates to a device for processing effluents and / or, for example, making a building frontage capable of producing biochemical primary energy obtained by photosynthesis. The invention more particularly relates to a device that includes: a container for cultivating algae and / or microorganisms in an aqueous medium; supply means for the algae and / or microorganism culture; means for injecting an effluent into said algae and / or microorganisms, said effluent coming from a building; means for adjusting the temperature of the algae and / or microorganism culture; effluent recovery means for recovering the effluent from a building and for injecting the same into the algae and / or microorganism culture; and optionally a lighting system for promoting the growth of the algae and / or microorganism culture.; The device of the invention can be used for producing biofuel, organic molecules, chemical compounds and proteins. The biofuel thus obtained may consist of oleaginous biomass, for example, which can directly be used in a thermal power plant or be converted by pyrolysis into coal or biopetroleum. The present invention also makes it possible to implement a new biological frontage and biological reactors integrated in the frontages of modern or old buildings under construction or already existing.
Owner:XTU

Transmission network dynamic reconfiguration method based on 3/2 wiring mode

ActiveCN107959286AComprehensive decision informationDynamic refactoring is automatically implementedAc network circuit arrangementsLow voltageTransformer
The invention discloses a transmission network dynamic reconfiguration method based on a 3 / 2 wiring mode. The transmission network dynamic reconfiguration method comprises the steps of: constructing atopological structure and parameter model of a power grid real-time mode or a mode to be studied, and evaluating capability and risks of independent district-wide operation of district power grids ofinterest; evaluating benefits and potential risks of electromagnetic looped network operation formed by the district power grids, and analyzing a cost of solving the electromagnetic looped network risks; analyzing a 3 / 2 wiring string configuration method in a transformer substation, and providing a dynamic reconstruction scheme for solving the electromagnetic looped network risk problem; and considering power supply reliability of a normal mode and potential risks of an accident mode, and deciding a district power grid operation mode optimal arrangement scheme and a power grid dynamic reconfiguration suggestion comprehensively. The transmission network dynamic reconfiguration method based on the 3 / 2 wiring mode avoids the load flow from shifting within the electromagnetic looped network in the accident mode, does not cause overload of low-voltage level equipment or damage to the system stability, and improves the operation safety of the system.
Owner:POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD

Multi-redundant configured voltage source type regulation device and control method thereof

The invention discloses a multi-redundant configured voltage source type regulation device. The multi-redundant configured voltage source type regulation device comprises an energy storage unit, a power conversion unit, a filtering isolation unit, a solid-state switch unit and a circuit breaker, wherein the power conversion unit comprises four groups of power semiconductor devices with diodes which are reversely connected in parallel, sources of a first power semiconductor device and a third power semiconductor device are connected with a positive electrode of the energy storage unit, drains of a second power semiconductor device and a fourth power semiconductor device are connected with a negative electrode of the energy storage unit, a first AC output end and a second AC output end are connected with a primary edge of the filtering isolation unit, a secondary edge of the filtering isolation unit is connected with the solid-state switch unit, the circuit breaker is connected in parallel with the solid-state switch unit, one end of the circuit breaker is connected with a power supply side, the other end of the circuit breaker is connected with a load side, the solid-state switch unit comprises the power semiconductor devices. By the device, rapid compensation can be achieved, and the device has high reliability. The invention also discloses a control method of the multi-redundant configured voltage source type regulation device.
Owner:NR ELECTRIC CO LTD +1

Chain link type automatic synchronous tensioning system and method for prestressed wire ropes

The invention discloses a chain link type automatic synchronous tensioning system and method for prestressed wire ropes. The chain link type automatic synchronous tensioning system comprises an anchor plate, wherein the anchor plate is fixed on a structure to be reinforced through planted bars; a plurality of main threaded rods are arranged in the anchor plate in a parallel and penetrating manner; one end of each of the main threaded rods is connected with a corresponding screw sleeve, and the other end of each of the screw sleeves is connected with a corresponding steel wire rope; after the other end of each of the main threaded rods penetrates through a corresponding opening of the anchor plate, the other end of each of the main threaded rods is fixed by a corresponding anchoring toothed nut; a tensioning bracket is arranged on one side of the anchor plate; after the main threaded rods penetrate in the tensioning bracket, each of the main threaded rods is connected with a corresponding secondary threaded rod through a corresponding connecting sleeve; after the other ends of the secondary threaded rods penetrate out of the tensioning bracket, the other ends of the secondary threaded rods are separately fixed on the tensioning bracket by corresponding tensioning toothed nuts; and the anchoring toothed nuts and the tensioning toothed nuts are separately connected with a driving mechanism. According to the chain link type automatic synchronous tensioning system disclosed by the invention, anchoring a plurality of steel wire ropes can be realized through one anchor plate, so that the reinforcing efficiency and the reinforcing effect of a conventional structure are improved; and synchronous tensioning and synchronous locking are performed on all the steel wire ropes on the anchor plate, so that the situation that the bearing capacity is reduced due to uneven distribution of the prestressing force of the steel wire ropes is avoided, and the automatic synchronous tensioning system is convenient to use, and simple and high-efficiency to mount.
Owner:JIANGXI GANYUE EXPRESSWAY +2

Photovoltaic off-grid inverter control method and control device

The invention discloses a photovoltaic off-grid inverter control method, and relates to the technical field of a photovoltaic off-grid inverter. The method is realized in such a way that by establishing a functional module architecture, a computer system is controlled by computer program instructions, and the computer program instructions are stored in a computer readable storage medium. A photovoltaic off-grid inverter comprises a mains supply rectifier module, a photovoltaic output control module, a battery and a busbar. An input end of the mains supply rectifier module is connected with a mains supply, and an output end is connected with the busbar. An input end of the photovoltaic output control module is connected with a solar panel, and an output end is connected with the busbar. The battery is charged from the busbar or discharged to the busbar. The control method is that if the solar energy is sufficient, the conduction angle of a switching element of a rectifier of the mains supply rectifier module is limited so as to be not less than a preset conduction angle limit value <theta>min. Thus, the case in which the rectifier is turned off due to that the conduction angle of the switching element is too small can be prevented, so that the mains supply rectifier module is ensured not to be turned off when the solar energy is sufficient.
Owner:GUANGDONG AIDI BEIKE SOFTWARE TECH

Telescopic mistaken touch prevention isolation tool for secondary terminal strip

The invention discloses a telescopic mistaken touch prevention isolation tool for a secondary terminal strip, and belongs to an isolation tool used for field operation in a regular inspection test ofsecondary equipment in the power industry. The isolation tool comprises a warning isolation belt, and telescopic isolation assemblies are installed at the top and the bottom of the warning isolation belt respectively. The telescopic isolation assemblies can stretch out and draw back in the height direction of the warning isolation belt, and a fixing device is further installed on each telescopic isolation assembly. The fixing devices can be detachably installed on a secondary terminal strip, and the warning isolation strip, the telescopic isolation assembly and the fixing devices are all madeof insulating materials. The invention aims to solve the problems that secondary terminal still exists in the same screen during regular check test of the current protection, measurement and control devices, the operation risks of mistaken contact, mistaken touch and mistaken disconnection and connection exist, and the potential safety hazard of power grid load loss caused by misoperation of the device exists.
Owner:GUIZHOU POWER GRID CO LTD

Determination method of power grid loss power shedding load based on linear interpolation method

A method for determining load shedding of power grid loss power based on linear interpolation method, the steps are: (1) Combining each set value of power generation and primary frequency modulation forward adjustable power, and each combination forms a system operation mode ;(2) According to the system operation mode formed by each combination, calculate the power loss when the system runs at the rated frequency, the highest frequency and the lowest frequency, and the system frequency drops to a certain set minimum frequency due to the loss of power supply Power value; (3) Use the linear interpolation method to calculate the power supply power value lost when the system frequency drops from the rated frequency, the highest frequency, and the lowest frequency to the set minimum frequency under the current system state; (4) Use the linear interpolation method , to calculate the allowable power loss value of the system when the current frequency drops to the set minimum frequency. When the allowable power loss value is less than the actual power loss value, the difference is the load to be shed. The invention can accurately determine the required load shedding quantity and avoid unnecessary load loss.
Owner:NORTHEAST ELECTRIC POWER DESIGN INST CO LTD OF CHINA POWER ENG CONSULTING GRP +1

A foundation pit support frame

The invention provides a foundation pit support frame, which relates to the technical field of construction. The support frame of the foundation pit includes: a bottom plate of the foundation pit, which is arranged at the bottom of the foundation pit; a support member, which is arranged in the foundation pit and supports the rock and soil layer, and the support member is located in the circumferential direction of the bottom plate of the foundation pit, The support is in the shape of a cuboid and is configured to have a cavity, and the bottom end of the support is lower than the bottom plate of the foundation pit; the purlin beam is used to support two opposite supports, and the purlin beam is arranged on the support The upper part of the member is connected with two opposite support members respectively; and the drainage member is arranged in the rock and soil layer and at least part of the drainage member extends into the cavity, and the drainage member is used to drain the water in the rock and soil layer into the cavity. The supporting frame of the foundation pit has a reasonable structure and good drainage effect, and can effectively avoid the collapse of the retaining wall of the foundation pit.
Owner:王长华

A voltage source regulator with multiple redundant configurations and its control method

The invention discloses a voltage source regulating device with multiple redundant configurations, which includes an energy storage unit, a power conversion unit, a filter isolation unit, a solid-state switch unit and a circuit breaker, wherein the power conversion unit consists of four groups of power converters with anti-parallel diodes Composition of semiconductor devices, the sources of the first and third power semiconductor devices are connected to the positive pole of the energy storage unit, the drains of the second and fourth power semiconductor devices are connected to the negative pole of the energy storage unit, and the first and second AC output terminals are isolated from the filter The primary side of the unit is connected; the secondary side of the filter isolation unit is connected to the solid-state switch unit, and the circuit breaker is connected in parallel to the solid-state switch unit; one end of the circuit breaker is connected to the power supply side, and the other end is connected to the load side; the solid-state switch unit includes power semiconductor devices. This kind of device can not only realize fast compensation, but also have high reliability. The invention also discloses a control method of a voltage source type regulating device with multiple redundant configurations.
Owner:NR ELECTRIC CO LTD +1

DC power drop method and system based on accurate perception of power loss in new energy stations

The DC power downshift method and system based on the accurate perception of the power loss of the new energy station of the present invention include the fault monitoring substation sending power grid fault information to the coordination control main station and the new energy control substation; the new energy control substation; After receiving the grid fault information, the station sends it to the centralized management and control system of the new energy station; after the centralized management and control system of the new energy station receives the grid fault information, it calculates the total amount of off-grid active power of the new energy through the information fed back from the new energy collection terminal; The energy station centralized management and control system sends the new energy off-grid active power of this station to the new energy control sub-station; after the coordinated control master station calculates the total amount of new energy off-grid active power in the whole network, the power grid execution station receives all the off-grid active power. After the speed-down DC power control command is given, implement the speed-down DC power control. The invention is beneficial to the frequency stability and emergency control after the large-scale off-grid of the new energy unit, and is beneficial to ensure the safe and stable operation of the power grid with a high proportion of new energy.
Owner:NORTHWEST BRANCH OF STATE GRID POWER GRID CO +1

Assembling device of transformer low-voltage outgoing line structure

The invention discloses an assembling device of a transformer low-voltage outgoing line structure. The assembling device comprises a transformer framework, a winding fixing structure and a low-voltagecoil winding are arranged on the periphery of the transformer framework, and the low-voltage coil winding comprises a plurality of low-voltage side coils. The low-voltage coil winding electrically connects a plurality of low-voltage side coils according to transformation requirements so as to obtain the number of turns of the low-voltage side coils in various number combinations, and a low-voltage wire outlet structure is reserved and used for being electrically connected with an external electric appliance and outputting power supply voltage to the external electric appliance. The winding fixing structure is used for sequentially stacking, nesting and fixing a plurality of low-voltage side coils in the low-voltage coil winding to the periphery of a transformer framework. The magnetic field of the current flowing to the external electric appliance through the external copper cylinder at the channel steel at the top of the transformer is weak, no loss or tiny loss is generated when themagnetic line of force passes through the channel steel, and the transformer is effectively prevented from generating extra load loss.
Owner:GUANGDONG POWER GRID CO LTD +1

A Dynamic Reconfiguration Method of Transmission Network Based on 3/2 Connection Mode

ActiveCN107959286BComprehensive decision informationDynamic refactoring is automatically implementedAc network circuit arrangementsTransformerPower grid
The invention discloses a transmission network dynamic reconfiguration method based on a 3 / 2 wiring mode. The transmission network dynamic reconfiguration method comprises the steps of: constructing atopological structure and parameter model of a power grid real-time mode or a mode to be studied, and evaluating capability and risks of independent district-wide operation of district power grids ofinterest; evaluating benefits and potential risks of electromagnetic looped network operation formed by the district power grids, and analyzing a cost of solving the electromagnetic looped network risks; analyzing a 3 / 2 wiring string configuration method in a transformer substation, and providing a dynamic reconstruction scheme for solving the electromagnetic looped network risk problem; and considering power supply reliability of a normal mode and potential risks of an accident mode, and deciding a district power grid operation mode optimal arrangement scheme and a power grid dynamic reconfiguration suggestion comprehensively. The transmission network dynamic reconfiguration method based on the 3 / 2 wiring mode avoids the load flow from shifting within the electromagnetic looped network in the accident mode, does not cause overload of low-voltage level equipment or damage to the system stability, and improves the operation safety of the system.
Owner:POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD

An assembly device for a transformer low-voltage outgoing line structure

The invention discloses an assembly device for a transformer low-voltage outgoing line structure, which includes a transformer skeleton, a winding fixing structure and a low-voltage coil winding are arranged on the outer periphery of the transformer skeleton, the low-voltage coil winding includes several low-voltage side coils, and the low-voltage coil The windings electrically connect several low-voltage side coils according to the transformation requirements to obtain multiple combinations of low-voltage side coil turns and reserve a low-voltage outlet structure, which is used for electrical connection with external electrical appliances and for The external electrical appliances output the power supply voltage, and the winding fixing structure is used to sequentially stack and nest several low-voltage side coils in the low-voltage coil winding to the outer periphery of the transformer frame. In the present invention, the current flowing through the external copper column to the external electrical appliance has a weak magnetic field at the channel steel on the top of the transformer, and no loss or tiny loss will be generated when the magnetic force line passes through the channel steel, effectively avoiding the additional load loss of the transformer.
Owner:GUANGDONG POWER GRID CO LTD +1

System and method for automatic synchronous tensioning of chain-type prestressed steel wire rope

The invention discloses a chain link type automatic synchronous tensioning system and method for prestressed wire ropes. The chain link type automatic synchronous tensioning system comprises an anchor plate, wherein the anchor plate is fixed on a structure to be reinforced through planted bars; a plurality of main threaded rods are arranged in the anchor plate in a parallel and penetrating manner; one end of each of the main threaded rods is connected with a corresponding screw sleeve, and the other end of each of the screw sleeves is connected with a corresponding steel wire rope; after the other end of each of the main threaded rods penetrates through a corresponding opening of the anchor plate, the other end of each of the main threaded rods is fixed by a corresponding anchoring toothed nut; a tensioning bracket is arranged on one side of the anchor plate; after the main threaded rods penetrate in the tensioning bracket, each of the main threaded rods is connected with a corresponding secondary threaded rod through a corresponding connecting sleeve; after the other ends of the secondary threaded rods penetrate out of the tensioning bracket, the other ends of the secondary threaded rods are separately fixed on the tensioning bracket by corresponding tensioning toothed nuts; and the anchoring toothed nuts and the tensioning toothed nuts are separately connected with a driving mechanism. According to the chain link type automatic synchronous tensioning system disclosed by the invention, anchoring a plurality of steel wire ropes can be realized through one anchor plate, so that the reinforcing efficiency and the reinforcing effect of a conventional structure are improved; and synchronous tensioning and synchronous locking are performed on all the steel wire ropes on the anchor plate, so that the situation that the bearing capacity is reduced due to uneven distribution of the prestressing force of the steel wire ropes is avoided, and the automatic synchronous tensioning system is convenient to use, and simple and high-efficiency to mount.
Owner:JIANGXI GANYUE EXPRESSWAY +2

Photovoltaic off-grid inverter control method and control device

The invention discloses a photovoltaic off-grid inverter control method, and relates to the technical field of a photovoltaic off-grid inverter. The method is realized in such a way that by establishing a functional module architecture, a computer system is controlled by computer program instructions, and the computer program instructions are stored in a computer readable storage medium. A photovoltaic off-grid inverter comprises a mains supply rectifier module, a photovoltaic output control module, a battery and a busbar. An input end of the mains supply rectifier module is connected with a mains supply, and an output end is connected with the busbar. An input end of the photovoltaic output control module is connected with a solar panel, and an output end is connected with the busbar. The battery is charged from the busbar or discharged to the busbar. The control method is that if the solar energy is sufficient, the conduction angle of a switching element of a rectifier of the mains supply rectifier module is limited so as to be not less than a preset conduction angle limit value <theta>min. Thus, the case in which the rectifier is turned off due to that the conduction angle of the switching element is too small can be prevented, so that the mains supply rectifier module is ensured not to be turned off when the solar energy is sufficient.
Owner:GUANGDONG AIDI BEIKE SOFTWARE TECH

Hollow tube flange composite beam provided with internal and external stiffening ribs

ActiveCN107386089AControl local buckling problemsLose weightBridgesShaped beamComposite beams
The invention relates to a hollow tube flange composite beam provided with internal and external stiffening ribs. A web is provided between an upper flange and a lower flange, an I-shaped beam is thus formed, the external stiffening ribs are arranged on the web perpendicularly, a top plate is arranged on the top of the upper flange, the upper flange is arranged as a hollow tube or both the upper flange and the lower flange are arranged as hollow tubes, the internal stiffening ribs are arranged in the hollow tubes or the hollow tubes are filled with a foaming steel material, the internal stiffening ribs and the external stiffening ribs are positioned on the same cross section, and the upper flange and the top plate are connected by shear connectors. The local buckling problem of the upper flange can be effectively controlled by the internal and external stiffening ribs, the construction process is simplified, security and stability at the stages of structure construction and use are guaranteed, the advantages of materials of the steel-concrete composite structure are given full play, the construction period is short, the dead-weight of the structure is small, the building height is small, the material properties of steel and concrete can be fully embodied, and the hollow tube flange composite beam provided with the internal and external stiffening ribs has better application prospects when compared with traditional I-shaped composite beams.
Owner:CHANGAN UNIV

An adjustable piezoelectric ceramic oil-sealed hydrostatic bearing

The invention discloses an adjustable piezoelectric ceramic oil seal edge liquid hydrostatic bearing. The adjustable piezoelectric ceramic oil seal edge liquid hydrostatic bearing comprises a shaft, astator, a first outer check ring, a second outer check ring, a first framework seal ring, a second framework seal ring, a first inner check ring, a second inner check ring, a first piezoelectric ceramic twin lamella and a second piezoelectric ceramic twin lamella. The rotor is a rotary body. Five coaxial rotary body cavities are formed in the rotary body. Four hydrostatic support cavities are evenly distributed in the inner circumference of a third cavity circumferentially. A radial oil inlet is formed in the center of each hydrostatic support cavity. A first piezoelectric ceramic groove anda second piezoelectric ceramic groove are machined in the inner circumference of the second cavity and the inner circumference of the fourth cavity correspondingly. Oil outlets are radially formed inthe top of the inner circumference of the first cavity and the top of the inner circumference of the fifth cavity correspondingly. The first piezoelectric ceramic twin lamella and the second piezoelectric ceramic twin lamella are embedded in the first piezoelectric ceramic groove and the second piezoelectric ceramic groove correspondingly. The piezoelectric ceramic twin lamellas are adopted for adjusting the thickness of a liquid film, the problem that the bearing force of the liquid hydrostatic bearing is lowered due to heating during operation is avoided, and the system stability is maintained.
Owner:YANSHAN UNIV

A line breaking method for eliminating the voltage exceeding the upper limit in the Spring Festival mode

The invention provides a circuit engagement and disengagement method for eliminating voltage upper limit surpassing in a Spring Festival mode and relates to a circuit engagement and disengagement method. In the premise of not reducing reliability of a power grid, how to eliminate voltage upper limit surpassing through opening circuits as less as possible becomes a concerned technical problem in power grid modulation. The method includes steps of acquiring power grid rack parameters and tides and generating a connection graph; according to the graph, generating an annular branch circuit sub graph; generating engagement and disengagement simulation analysis on the annular branch circuit sub graph and generating a candidate engagement and disengagement branch circuit set, performing treatment on the candidate engagement and disengagement branch circuit set by using N-1 anticipated faults and generating a valid anticipated fault set; constructing constraints and a target function; solving a minimal engagement and disengagement branch circuit set. According to the technical scheme provided by the invention, in the premise of ensuring the power grid reliability, an aim of eliminating voltage upper limit surpassing through opening circuits of the minimum quantity is achieved, load loss is avoided and power grid reliability is enabled to meet operation requirements.
Owner:STATE GRID HEBEI ELECTRIC POWER CO LTD +3
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