62 results about "Public supply" patented technology

A system, method, and apparatus infrastructure provide real time wireless tracking of multiple initial data parameters transmitted from individual mobile receiving or system units installed in customer vehicles. A management network receives and decodes initial data parameters from respective receiving mobile units, matches and encodes the same according to stored predetermined customer specified format preferences, and transmits customer specified data streams to customers. An additional step correlates the received specified-data streams with additional public-supplied data or third-party contractually supplied data to provide an enhanced customer report enabling a number of reports; including a credibility determination between the public-supplied data and the received specified-data, a customer vehicle travel efficiency report, a safe operation vehicle report, and a vehicle operator effectiveness report. Each vehicle system unit is functionally enabled to secure transmission of a communication protocol over GSM, GPRS, CDMA, or other networks enabling seamless and secure functionality between wireless or wired data-links.

The invention discloses an energy router for distributed power generation, which comprises a plurality of controllable switches, a current converter (4), an energy storage unit (3), a power frequency alternating current bus (12), an energy management system (13) and a static switch (14), wherein the controllable switches are connected onto the power frequency alternating current bus (12); the energy storage unit (3) is connected to the input side of the current converter (4); the output side of the current converter (4) is connected onto the controllable switches; one end of the static switch (14) is connected onto the power frequency alternating current bus (12); and the other end of the static switch (14) is connected to a public supply network (15). The energy management system (13) is connected with the controllable switches, the current converter (4) and the static switch (14) through an Ethernet. The energy management system provides a networking scheme, a stable control means and a load management strategy, so that the stable controllable alternating current electric energy is outputted after various instable power supplies are connected to the energy router.

The invention relates to an anti-islanding protection system for a distributed grid-connected system and a protection method of the anti-islanding protection system based on wave carrier communication and decentralized detection technology. The anti-islanding protection system comprises a decentralized detection device, a central detection device and a communication device. The decentralized detection device is used for acquiring the electrical capacity of the system and judging whether a public supply network loses power or not by data processing and logical judgment for the electrical capacity. The central detection device receives information from the decentralized detection device and logically judges the information to protect a common connection point of the distributed grid-connected system, and transmits a control instruction to a distributed power supply grid-connected point switch. The communication device is used for transmitting the information of the decentralized detection device to the central detection device and transmitting the control instruction of the central detection device to the distributed power supply grid-connected point switch. An upper carrier acquires the information of the supply network for islanding discrimination, a lower carrier controls the distributed power supply grid-connected point switch on a user side, a distributed power supply is cut off, islanding effects are prevented, and reliability and safety of the distributed grid-connected system are improved.

The invention belongs to the field of photovoltaic manufacturing and application, and particularly discloses an overwater solar photovoltaic power generation system. The overwater solar photovoltaic power generation system comprises a plurality of solar cell assemblies which are arranged in an array and an overwater photovoltaic array trestle table used for fixation. The solar cell assemblies are connected to form a photovoltaic array. The photovoltaic array is connected into a public supply network or a local load through a cable via a photovoltaic system balance device and a grid-connected inverter, or is connected with a photovoltaic controller and a storage battery pack or an off-network inverter through a cable and is used for supplying electricity to a direct current load or an alternating current load on water or off shore. By means of the overwater solar photovoltaic power generation system, a solar photovoltaic power generation system can be installed on the surface of a water area such as a reservoir, a lake, a river and the sea; by means of fully utilizing the overwater sun exposure area with good solar irradiation conditions, the restriction on the installation area of the solar photovoltaic power generation system due to the facts that land resources are limited and land cost is high can be overcome beneficially, and the concept that a large or ultra-large photovoltaic power station is built at a coastwise water area to provide electric power for coastwise regions or cities nearby can be popularized beneficially.

The invention provides a control system and a control method for photovoltaic auxiliary grid-connected power generation. The system comprises a direct current voltage boosting module, a direct current limited power voltage transformation module, a grid-connected inverter, a direct current compensation module, an alternating current inverse module, an alternating current switching module, a monitoring module and a control module. The method comprises the following steps that a photovoltaic module is opened to perform power generation; whether a public supply network loses power is judged, if the public supply network loses power, the photovoltaic module is used for independently supplying power to a user load; if the public supply network does not lose power, and the generated energy of the photovoltaic module is larger than that of the user load, the photovoltaic module is used for independently supplying power to the user load, at the same time, surplus electric energy is input into the public supply network in a grid-connected way; and if the generated energy of the photovoltaic module is smaller than that of the user load, the public supply network performs direct current compensation to electric energy output by the photovoltaic module. By adopting the control system and the method, the energy use efficiency is high during photovoltaic power generation, and the system is stably operated.

The invention discloses an auto-starting control method for a photovoltaic inverter. The method comprises the following steps: sampling voltage, current and temperature parameters of the photovoltaic inverter; continuously sampling if the voltage, current and temperature parameters of the photovoltaic inverter are normal, once the stopping of the inverter is found, and the stopping time is longer than T1, on one hand, sending a start signal to a power valve of the inverter to enable the inverter to be started automatically, and on the other hand, sending a connection signal to enable the photovoltaic inverter and a public supply network to be switched on; stopping sending the start signal and the connection signal if the restart time is greater than N. The method has the benefits that the a control system tries to detect parameters which cannot be detected while the inverter is turned off under a starting up state so as to realize the auto-starting of the inverter, and auto-starting of the inverter cannot be realized after the inverter is restarted by a certain time, so that unnecessary stopping of the inverter which is caused by interference on the inverter can be reduced.

The invention provides a photovoltaic reverse power control and protection system which is applied to a solar photovoltaic power generation system. On the current market, the existing reverse relay protector only can control the reverse power in a certain range. The reverse power control and protection system comprises a reverse power collector, a reverse power monitoring system and a reverse power control system, wherein the reverse power collector is used for collecting the information of a photovoltaic power generation system and the information of a load in real time, and transmitting the information to the monitoring system in real time to be processed; and the reverse power controller is used for receiving the instruction output signal of the monitoring system to control the operation of the photovoltaic power generation system. When the photovoltaic power generation system has reverse current which is transferred into a public supply network, all sub-power generation systems of the photovoltaic power generation system are immediately cut off to be combined to the grid, and the power consumption of the public supply network and the power consumption of the load are collected simultaneously, so that each photovoltaic subsystem intelligently puts into an operation state or a halted state to be automatically matched with the load at the user side. In the drawing, part 1 is the reverse power collector, part 2 is the reverse power monitoring system, and part 3 is the reverse power control system.

The invention discloses a tracking control method and system for a photovoltaic power station. The photovoltaic power station comprises an array photovoltaic module for converting the luminous energy into a direct current for outputting and an inverter for converting the direct current into an alternating current and generating power in a grid-connected mode with a public supply system. The method includes: a current power supply environment state of a public supply system is detected; when the power supply environment of the public supply system is normal, switching to a first power supply line with an input terminal connected in parallel to an output terminal of the inverter and a connecting terminal of the public supply system is realized to provide power for a photovoltaic tracking controller; when the power supply environment of the public supply system is abnormal, switching to a second power supply line with an input terminal connected in parallel to an input terminal of the inverter and a connecting terminal of the array photovoltaic module is realized to provide power for the photovoltaic tracking controller; and one of the first power supply line and the second power supply line provides power, so that the photovoltaic tracking controller controls the direction and angle of the array photovoltaic assembly. Therefore, field cable laying is reduced substantially; and the tracking system becomes flexible and stable when facing a changeful station environment and thus the communication quality becomes reliable.

The invention discloses single-phase power supply devices, a novel electric railway tractive power supply system comprising the single-phase power supply devices and a control method. The power supply system comprises a power supply synchronous controller, a plurality of the single-phase power supply devices and a plurality of interval interconnection switches; each single-phase power supply comprises multiple secondary line winding transformers, a plurality of power conversion units and a master controller; the power supply synchronous controller is responsible for controlling effective values, frequency and phases of voltage of the whole traction network to be consistent, the single-phase power supply devices are used for converting a three-phase power supply into a synchronous single-phase power supply according to a synchronization instruction, and the interval interconnection switches are connected with all power supply intervals to form a unified whole. According to the invention, the problem about electric energy quality of a public supply network due to a traditional tractive power supply system is effectively solved, the controllable, reliable and continuous power supply is provided for an electric locomotive, meanwhile, an ice melting function is realized, and safety and reliability of the tractive power supply system are guaranteed.

The invention discloses a photovoltaic LED direct-current power supply control system which comprises a photovoltaic array, a controller, an energy storage battery, a drive control module, an LED load, a grid-connected inverter and a public supply network. The controller is connected with the photovoltaic array and used for carrying out voltage conversion on direct currents output by the photovoltaic array to charge the energy storage battery and detecting the electric quantity of the energy storage battery. After the electric quantity of the energy storage battery is saturated, redundant electric energy is input to the grid-connected inverter by the photovoltaic array. The drive control module is connected with the energy storage battery and used for carrying out voltage conversion on output voltages output by the energy storage battery to supply power to the LED load. The grid-connected inverter is connected with the photovoltaic array and the public supply network and used for carrying out contravariant conversion on the redundant electric energy output by the photovoltaic array to form alternating currents to be conveyed to the public supply network. Direct-current direct supply is really achieved, conversion links are reduced, the effects of environmental protection and energy saving are achieved, and meanwhile the functions of peak regulation and the like are achieved.

The invention provides a solar peak and valley power regulating system which is applied to development and utilization of renewable energy sources. The solar peak and valley power regulating system comprises a solar photovoltaic grid-connected generation system, a multi-way inverter, an energy storage system and unloading equipment. By detecting whether the terminal voltage of a public supply network is higher or lower, the excess energy on the public supply network can be used for charging the energy storage system, or the solar photovoltaic grid-connected generation system is used for supplying power to the public supply network. When the generation power of the solar photovoltaic grid-connected generation system is greater than the required power of the public supply network, the excess energy can be stored in the energy storage equipment or can be unloaded; and when the generation power of the solar photovoltaic grid-connected generation system is less than the required power of the public supply network, the energy in the energy storage equipment is used as a supplement. In the drawing, part (1) is the solar photovoltaic grid-connected generation system, part (2) is the multi-way inverter, part (3) is the energy storage equipment, part (4) is the public supply network, and part (5) is the unloading equipment.

The invention discloses a payment system for an electric car charging pile. The payment system is characterized by comprising the processes as follows: electric energy is fed to an on-board charger by a public supply network through an electric energy metering module and a main contactor in sequence; electric energy metering information is fed to a main control module by the electric energy metering module; the main control module controls on / off of the main contactor; the main control module is connected to a human-computer interaction module, a network payment module and a card reader for payment management respectively, so that various payment requirements of users are met. By the structure and the method, the payment system has the advantages that (1) inconvenience caused by a single cash payment mode is avoided; (2) the user of an electric car can have a plurality of selective payment modes; (3) unlimited charging of the electric car at different places is achieved, and the battery lifetime of the electric car is prolonged; (4) the adopted network payment is time-saving and simple.

In a work vehicle, a fuel supply path including a first fuel supply path connecting a first fuel tank to a merging portion, a second fuel supply path connecting a second fuel tank to the merging portion, and a common supply path connecting the merging portion to an engine is formed. A fuel pump supplying fuel to the engine is provided in the common supply path. Check valves that open according to a differential pressure between pressures on the fuel tank side and the merging portion side are interposed on the first fuel supply path and the second fuel supply path. A communication channel establishes communication between an upper space of the first fuel tank and an upper space of the second fuel tank is formed.

The invention discloses a method for saving energy of an elevator, which comprises the following steps of: acquiring operating condition information or idle condition information of an elevator; generating a first control signal according to the operating condition information, or generating a second control signal according to the idle condition information; and switching on a front contactor of a frequency converter of the elevator according to the first control signal, or switching off the front contactor of the frequency converter according to the second control signal, wherein the front contactor of the frequency converter is used for switching on or switching off power transmission from a public supply network to the frequency converter of the elevator. The invention also discloses another method for saving energy of the elevator and a device corresponding to the two methods. The methods and the device have the advantages of: automatically switching off power supply circuits of the frequency converter of the elevator when the elevator is in the idle condition, and automatically recovering power supply to the frequency converter when the elevator needs operating so as to greatly reduce energy consumption of the elevator and save a great amount of electric energy.

The invention relates to a railway streetlamp for generating power by utilizing a flywheel battery and suction force and a use method thereof. The railway streetlamp and the use method are characterized in that each streetlamp at the two sides of the railway is additionally provided with a swinging device adopting the suction force as power; when a high-speed train passes, each swinging device swings due to action of the suction force; the swinging force enables a flywheel generating device to store energy and generate power simultaneously; the generated power is stored in one flywheel battery; and at night, a control circuit sends a message, and the flywheel battery supplies power to the streetlamps at the two sides of the railway to emit light for illumination. The railway streetlamp and the use method have the beneficial effects that the suction force generated when the high-speed train runs is utilized for generating power so as to provide stable and environmentally-friendly power for illumination of the railway streetlamp; the defect of unstable power of wind-energy and solar streetlamps is avoided; the power resource of a public supply network is also saved; since the energy for generating power is stored by utilizing the flywheel battery to replace the power stored by a chemical storage battery, the environmental pollution of the chemical battery is avoided, and the defects that the chemical battery is short in service life and needs to be maintained frequently are also avoided.

A liquid ejection apparatus of the invention includes a liquid storage container that stores liquid, a plurality of print element boards including an ejection opening that ejects liquid and a pressure chamber that includes a print element generating energy for ejecting liquid therein, a common supply passage that supplies liquid to the plurality of print element boards, a supply-side filter provided in a passage between the liquid storage container and the common supply passage to remove a foreign substance from liquid, and a supply-side pressure adjustment mechanism provided in a passage at a downstream side of the common supply passage to adjust a pressure in the common supply passage.

The invention provides a grid connection type sharing charging renting device which comprises a photovoltaic shed structure and a renting terminal; a solar panel is installed on a ceiling of the photovoltaic shed structure; the renting terminal is used for renting a portable power source to a user; a portable power source storage charging device is used for containing the portable power source orcharging the portable power source, and the solar panel is connected with a photovoltaic grid connection and disconnection device; the photovoltaic grid connection and disconnection device is connected to the solar panel and electricity generated by the solar panel is supplied to a public supply system. Clean solar energy is adopted as the charging power of the sharing portable power source, and the requirement of people for outgoing charging is met; in addition, the grid connection mode is adopted, surplus solar generated electricity is supplied to the public supply system, the business modelof the renting device is defined again, and the benefits of the renting device are increased while solar energy is sufficiently utilized; meanwhile, from the view of the user, the user can use the device conveniently and rapidly, and the device is exquisite in design, and capable of being applied and popularized outdoors.

The invention discloses a detection method of harmonic energy, which is used for detecting harmonic waves and obtaining harmonic waveform and harmonic wave power. The detection method is also used for obtaining the total harmonic wave electric quantity by calculating the 1-64 times of harmonic wave electric quantities, and comprises the following steps: filtering samples obtained from sampling points; conducting FFT (fast Fourier transformer) calculation on the filtered samples; calculating the electric quantity according to the result obtained by FFT calculation; obtaining 1-64 times of harmonic wave electric quantities through calculation according to the result of the electric quantity calculation; and calculating and obtaining the total harmonic wave electric quantity according to the 1-64 times of harmonic wave electric quantities. According to the invention, the 1-64 times of harmonic wave electric quantities can be calculated, the total harmonic wave electric quantity also can be calculated, the calculation result has the important significance on whether the harmonic waves generated by a user can affect the electricity supply volume, and whether a multifunctional electric meter for measuring the electric energy of harmonic components is additionally loaded on the user is decided by measuring data, wherein the user generates the harmonic waves, but the harmonic waves do not surpass the rules of national standard 'GB / T14549-1933 Harmonics in public supply network of quality of electric energy', so that the line loss can be reduced.

The invention discloses an islanding detection method for a photovoltaic energy storage system. A grid-connected photovoltaic power generation system comprises a photovoltaic module and an inverter, wherein the photovoltaic module is connected to a public supply network through the inverter and a breaker; a local load is connected to a point of common coupling between the inverter and the breaker; the islanding detection method is characterized in that when the power grid is disconnected, if the active power and the reactive power are matched, and the condition that (1-U2 / U0) is smaller than PG / PL smaller than (1-U1 / U0) is satisfied, the islanding detection is not conducted. The islanding detection method disclosed by the invention has the advantages that the method can reliably and accurately detect the islanding, increase the strain capacity of the equipment, and avoid misjudgment.

The invention discloses a method and a system for three-phase PQ control based on an adaptive notch filter under the condition of three-phase imbalance. The system comprises a sequence component decomposition module and a three-phase PQ grid-connected control module. The sequence component decomposition module converts three-phase voltage on a public supply network side to positive-sequence components. According to the received positive-sequence components of the three-phase voltage on the public supply network side, and an input active power set value, a reactive power set value, and a grid-connected current measured value, the three-phase PQ grid-connected control module firstly generates a grid-connected current reference value, and then calculates the difference value of the grid-connected current reference value and the grid-connected current measured value, and finally, the difference value is sent to a PWM signal generator through a PID controller, so as to generate a PWM signal used to control a photovoltaic power generation system. Comprehensive properties of the system are obviously improved than that of an existing strategy, a photovoltaic power generation system can output in preset power is realized. Even though the public supply network side has certain fluctuation, the system can safely and stably operate with a public supply network in a grid-connected manner.

An object of the present invention is to provide an ink jet head and the like that are small, are capable of achieving a higher resolution, increasing ejection stability, and lowering production costs, and include flow paths capable of circulating ink. An ink jet head of the present invention includes: a head chip including nozzles, pressure chambers that communicate with the respective nozzles, piezoelectric elements that correspond to the respective pressure chambers, discrete circulation flow paths that branch from ink flow paths extending from inlets of the pressure chambers to outlets of the nozzles and are capable of discharging the ink in the pressure chambers, and a common circulation flow path with which at least two of the discrete circulation flow paths communicate; and a common supply liquid chamber that is provided on the upper surface of the head chip, and stores the ink to be commonly supplied to the respective pressure chambers through ink supply holes formed in the upper surface of the head chip.

The invention relates to an online test system, a device and a method of wind power generation equipment. The online test system comprises a public supply network, wind power generation equipment and an online test device, wherein the online test device comprises a plurality of doubly-fed pulse-width modulation (PWM) converters connected in a parallel mode, one of the plurality of doubly-fed PWM converters is a host device, the others of the plurality of doubly-fed PWM converters are slave devices, the host device regulates output current of each slave device in real time to achieve current-sharing control and controls every slave device within every preset adjustment step length in the process of outputting abnormal work signal to the wind power generation equipment. According to the online test system, the device and the method of the wind power generation equipment, the wind power generation equipment can online test properties of the wind power generation equipment in the process of providing normal power supply to the public supply network. Besides, current output from the wind power generation equipment to the public supply network on the same circuit, inputting of abnormal work signal to the wind power generation equipment and test to the wind power generation equipment can be realized.

A multi-microgrid flexible interconnection structure based on common connection units comprises a plurality of alternating current interface connection lines, a plurality of direct current interface connection lines and a plurality of common connection units; two ends of each alternating current interface connection line are respectively connected with a public supply network and one correspondingcommon connection unit; two ends of each direct current interface connection line are respectively connected with the common connection units; and each common connection unit is connected with one corresponding microgrid. The multi-microgrid flexible interconnection structure based on common connection units can improve the operation reliability of the multi-microgrid system by support of the frequency, the voltage and the power of the public supply network and can provide a higher control dimension and more flexible control strategy so as to obtain a better control effect, improve operationflexibility of the multi-microgrid system, reduce the electromagnetic coupling between the microgrids, improve the electric energy quality and improve the access capacity and the utilization rate of distributed new energy.

The invention provides a water pump power generation system in a pumping station and a control method. The system comprises a plurality of water pump motors, a plurality of water pumping pipes, a four-quadrant converter and a plurality of rotational speed detection units. The four-quadrant converter comprises a phase-shifting transformer, a control unit and a plurality of power units. Each power unit is composed of a rectifier unit and an inverter unit, wherein the rectifier unit and the inverter unit are connected via a DC bus. The control unit comprises a valve control sub-unit and a feedback control sub-unit. The valve control sub-unit starts the valve of a corresponding water pumping pipe when the rotational speed of a corresponding water pump motor, measured by any rotational speed detection unit, is larger than a rotational speed preset value. The feedback control sub-unit drives the rectifier unit to run in the energy feedback mode when the voltage of the DC bus is larger than a voltage preset value. According to the technical scheme of the invention, the four-quadrant converter realizes the drive control of water pump motors and the energy feedback of the water pump motors at the same time. Meanwhile, in combination with the control of a contactor, the energy can be efficiently fed back to a public supply network.

The invention discloses a community public article distribution system and method based on face recognition. The community public article distribution system comprises a safe deposit box and a background server. The safe deposit box comprises a storage cabinet, an operation table and a scene camera; the storage cabinet is used for storing public supplies, the scene camera is connected with the background server, and the background server is connected with the safe deposit box, a community display device and a user terminal. The system can rapidly and accurately put public supplies into idle storage cabinets; the public supplies can be distributed to owners meeting conditions rapidly by utilizing a face recognition technology; the owners rapidly take the public supplies through the safe deposit box, so that the pickup burden of the owners is reduced, the efficiency is improved, and the delivery cost is reduced; and the public supplies can be more conveniently and rapidly put and taken.

The invention relates to a driving system for a tandem double-dynamic engineering machine. An engineering machine running by adopting single-dynamic drive has the problems that the oil consumption cost is high, the environment polluted by waste discharge, and the flexibility is poor, and has no external public supply network or cannot work under power cut, and as an adopted connection mode is a mechanical connection mode, the traditional engineering machine technology with an electromechanical dual-hydraulic drive function has the problems that the manufacturing cost is high, temperature rise is fast by adopting hydraulic drive and faults are multiple, and meanwhile, as the power supply mode of the engineering machine is of a towing type, the engineering machine is limited by cable length, and has the defects of being wide in working range and inconvenient to move. In order to overcome the problems and the defects, the invention provides the driving system for the tandem double-dynamic engineering machine, which is used for driving the engineering machine to run. The technical scheme adopted by the invention is that the lower bodywork of the engineering machine is provided with an engine (1); the output end of the engine (1) is provided with a clutch (2); the output end of the clutch (2) is connected with a motor (3); the output end of the motor (3) is provided with an oil pump (4); the output end of the oil pump (4) is connected with a working device (5), and therefore, the goal that the tandem double-dynamic engineering machine is driven to work can be achieved.

The invention discloses an electric vehicle intelligent alternating current charging system, which comprises a power acquisition device and a control device, the power acquisition device is arranged at an input terminal of a public supply network, and the input terminal of the public supply network is a three-phase four-wire system; electricity users of thepublic supply network include one or moreexternal alternating current charging piles; the power acquisition device is connected with the control device, used for power acquisition ofthree phases and a zero line of the public supply networkto determine the load condition of each phase and sending the load conditions to the control device; and the control device is used for generating control signals according to the load conditions andsending the control signals to the external alternating current charging piles, so as to control the external alternating current charging piles to operate from the phase line with heavy load to the phase line with light load. According to the technical scheme, on the basis of giving priority to residential electricity consumption and production electricity consumption, the rest available electricity is dynamically distributed to the charging piles, power resources are fully utilized, and obstacles are cleared for the charging piles entering communities.

The invention relates to a countercurrent-preventing protection and control method for a microgrid. The method comprises the following steps that (1) when Ps-P1>Pa, the method turns to a step (2); when P1-Ps>Pb, the method turns to a step (3); when -Pb<=Ps-P1<=Pa, the current state of the microgrid is kept unchanged; (2) the current capacity of an energy storage system is detected, and if the current capacity of the energy storage system does not reach the upper energy limit of the energy storage system, the method turns to a step (4); if the current capacity of the energy storage system reaches the upper energy limit of the energy storage system, the method turns to a step (5); (3) the microgrid is switched to be in a grid-connection mode, and the load gap of the microgrid is supplemented through a public supply network and the energy storage system; (4) the microgrid is switched to be in an island mode, and the energy storage system absorbs redundant distributed power generation capacity in a charging mode; (5) the microgrid is switched to be in the island mode, a controllable switch on a line connected between an additional load and an alternating current bus is powered off, and redundant power sent by the microgrid is absorbed through the additional load.