36 results about "Stand-alone power system" patented technology

This invention relates to a direct control method for instant power of a generation system of a stator-double winding asynchronous motor, in which, the system includes a stator-double-winding asynchronous generator, a filter inductor, a power converter, a commutating bridge, a excitation capacitor, a storage battery, a diode, a current sensor, three voltage sensors, a digital signal processor and a drive circuit and gets rid of a rotation speed sensor and a current closed loop circuit, and the method includes: taking controlling the instant power of a winding as the direct control object and limiting it in a given error sphere by optimizing selection of voltage vectors so as to output constant voltage.

Within variable range of rotate speed and load, genetic algorithm is adopted in the design method to carry out optimized iteration to select value of AC capacitance and parameters of motor in order to make maximum absolute value of inductive exciting current be equal to maximum absolute value of capacitive exciting current. Thus, parameters of motor and system are obtained so as to realize minimum capacity of excitation converter. Based on magnitude of instantaneous rotate speed and load, the control method calculates magnitude of reactive current the controller should supply. Excitation converter supplies inductive and capacitive reactive currents for the motor so as to realize constant output voltage. Capacity of the excitation converter is about 1 / 3 of total output capacity. The invention reduces size and lowers cost, outputs constant DC capable of incorporated to power network, applicable as independent power source and wind electric power generation on sea.

A grid independent operation control unit includes a load current estimator to estimate a load current supplied to stand-alone power system in accordance with an output current of the inverter and an output voltage, and a feedback controller configured to PWM control the inverter at a duty ratio feedback calculated to cause the inverter to output an output voltage command value in accordance with the output voltage and the load current. The feedback controller is configured to PWM control the inverter at a duty ratio feedback calculated for output of a normalized output voltage command value obtained by normalizing the output voltage command value with the DC bus voltage in accordance with normalized output voltage obtained by normalizing the output voltage with the DC bus voltage and normalized load current obtained by normalizing the load current with the DC bus voltage.

The invention, which belongs to brushless generator field, discloses a double excitation-winding compound-excitation double-salient brushless direct-current generator. The double excitation-winding compound-excitation double-salient brushless direct-current generator comprises: a double excitation-winding compound-excitation double-salient motor, a rectification circuit and a filtering capacitor. An armature winding of the double excitation-winding compound-excitation double-salient motor, the rectification circuit, a first set of excitation winding of the double excitation-winding compound-excitation double-salient motor and the filtering capacitor are successively connected in series. A second set of the excitation winding of the double excitation-winding compound-excitation double-salient motor is connected with a direct current excitation power supply. Because of a self-excitation effect of the first set of the excitation winding, a generator voltage regulation rate is low and excitation power needed by control output is low. The generator is especially suitable for independent power supply systems, such as an electric automobile vehicle power generation system, an airplane power generation system and the like.

The invention relates to a megawatt wind power storage battery combined independent power supply system, which comprises a plurality of wind turbines, a storage battery energy storage regulation system, a plurality of storage battery packs, an external standby power supply and unload charges, wherein the output ends of the wind turbines are connected with a high-voltage main bus; the storage battery energy storage regulation system comprises a plurality of charge and discharge management systems and a system main monitor, wherein the alternating current side of each charge and discharge management system is connected with the high-voltage main bus after the alternating current side is connected with a public bus, and the system main monitor conducts information interaction with the charge and discharge management systems through a plurality of CAN interfaces and works according to the commands of the charge and the discharge management systems; each storage battery pack is connected with the direct current end of the corresponding charge and discharge management system and conducts bidirectional regulation of active power and reactive power jointly with PCC points formed by the high-voltage main bus and the storage battery energy storage regulation system within the voltage range from the upper limit to the lower limit to enable the voltage and the frequency of the PCC points to be stable; the external standby power supply supplies power to the high-voltage main bus under the control of the system main monitor in the storage battery energy storage regulation system to enable the voltage and the frequency of the PCC points to be stable; and the unloading charges are used to consume the power output by the high-voltage main bus under the control of the system main monitor in the storage battery energy storage regulation system to enable the voltage and the frequency of the PCC points to be stable.

The invention discloses a frequency conversion alternating current generation system control method with a voltage harmonic suppression function. A generator of a generation system is a stator duplex winding asynchronous generator and provided with two sets of stator windings, one set of stator winding is a control winding and connected with a power converter, and the other set of stator winding is a power winding and outputs three-phase frequency conversion alternating current. Frequency of output voltage of the power converter is controlled according to active load information and the error of direct current bus voltage of the power converter, the amplitude of the output voltage of the power converter is controlled according to the error of fundamental components and the error of harmonic components of the output voltage, therefore, slip frequency of the generator can be changed, the amplitude and the harmonic content of a air-gap field can be adjusted, and the frequency conversion alternating voltage output by the generation system can be stable and sinusoidal. The control method is simple in structure, strong in load adaptability, adaptive to both linear load and nonlinear load, and suitable for being used in fields with high requirements on power supply quality of an independent power supply system, such as airplanes and ships and warships, and the output voltage is good in static and dynamic performance.

A kind of three-phase asynchronism motor direct current starting generate electricity system that is started in low voltage and generates electricity in high voltage includes three phase asynchronism motor, starting power source and main loop power switch converter, it characterized in that said main loop power switch converter includes two three-phase inversion bridges, thereinto the midpoint of three bridge arms of three-phase inversion bridges whose one direct current generatrix is connected with the starting power source is connected with three leading-out terminals of three-phase winding of asynchronism motor, the midpoint of three bridge arms of three phase inversion bridges whose another direct current generatrix is connected with the starting power source is connected with three leading-out terminals of three-phase winding in another side of asynchronism motor, power switch composes connection of starting in low voltage 'Delta', connection of generating in high voltage 'Y', direct current generatrix of two three-phase inversion bridges are parallel connected with conversion switch, the starting running is parallel connected, generating running is cut off. The system resolves contradiction of starting in low voltage and generating in high voltage, and applied in independent power system such as avigation, chariot, and shipping.

The invention discloses a variable-frequency alternating current power generation system and a control method of the variable-frequency alternating current power generation system, and belongs to the technical field of variable-frequency alternating current power generation systems. The variable-frequency alternating current power generation system comprises a stator two-winding asynchronous power generator, a filter inductor, a power converter, an excitation capacitor, a filter capacitor, a storage battery, a diode, a direct current voltage sensor, an alternating current voltage sensor, an alternating current sensor, a controller and a driving circuit, wherein a rotating speed sensor and a current closed loop line are not needed. In the control method for the variable-frequency alternating current power generation system, change information of output voltage and output current are considered comprehensively according to a power balance idea; the slip frequency of the power generator is quickly controlled according to the characteristic that the voltage frequency can be changed quickly, so that electromagnetic torque is adjusted quickly; and power balance is realized, and the output voltage is stable. The control method is simple in structure; complicated coordinate transformation is not needed; the dynamic property and the static property are high; and the control method can be used in independent power supply systems, such as airplanes, naval vessels and the like.

The invention discloses a mixed excitation synchronous motor with combined rotor cores internally provided with retained magnetic bridges. The mixed excitation synchronous motor comprises a motor shell, a stator, a rotor, the annular retained magnetic bridges fixed to a supporting shaft and a rotating shaft, wherein the stator, the rotor, the annular retained magnetic bridges and the rotating shaft are arranged in the motor shell. The stator comprises a stator core and an armature winding embedded into a groove of the stator. The rotor comprises the two oppositely-closed combined rotor cores distributed in a staggered mode and a tangential magnetization permanent magnet. The portions, in contact with main air gaps, of the combined rotor cores are of lamination structures, and the other portions of the combined rotor cores are of complete-block structures. Exciting windings are embedded into the annular retained magnetic bridges, the annular retained magnetic bridges are located on the inner sides of the rotor cores, and additional air gaps exist between the annular retained magnetic bridges and the rotor cores. According to the mixed excitation synchronous motor, the space inside the rotor is sufficiently used on the basis that the capacity for adjusting the air gap magnetic field width range of the mixed excitation synchronous motor is kept, and the axial length and the weight of the motor can be reduced; the portions, in contact with the main air gaps, of the rotor cores are of the lamination structures, the eddy-current losses of the rotor are reduced, and the mixed excitation synchronous motor has the important application value in new energy automobiles and independent power systems.

This is a scalable water cleansing system intended for very low technology primitive communities buildable for between $600 and $1,000 of parts. A gravity feed system is contemplated with one or more of an initial filtering stage(s), a settling stage, a UV treatment stage, and an ozonator stage. A stand-alone power system with solar power needing no infrastructure is contemplated to enhance purification. The system can improve the worst of water quality, including for small groups; and under some conditions to end up with clean water of a quality found in developed countries with mature water systems.For water to the site in communities with low precipitation, the water brought in would be emptied into the initial stage of the water cleansing system, and the person who brought the water would draw from the last stage most or all of the amount of water carried in.

The invention relates to a high-fault-tolerance power supply method in which all branches of an electric generator operate independently. According to the high-fault-tolerance power supply method disclosed by the invention, the electric generator adopts a multi-branch stator winding structure; each branch operates independently, and a three-phase alternating current emitted by each branch is rectified and inverted and then is supplied to a load respectively; a terminal voltage of the branch with highest output power is collected as a feedback signal for adjusting the rotation speed of a prime motor, and the terminal voltage is maintained constant. Compared with a method in which the electric generator is used as a traditional independent power supply for integrally generating and transmitting electricity in a unified manner, the high-fault-tolerance power supply method has the advantages that when the capacity of the electric generator is over megawatt, the defect that a high-current contactor exists in a large-capacity transmission line is overcome, the problems of current grade, cooling difficulty and the like when a frequency converter is used for supplying power are avoided, the key technical problem urgent to be solved for improving the operation reliability of an independent power supply system and enlarging the capacity are solved, and thus the high-fault-tolerance power supply method has high practical value.

A method for operating an electrical charging station at an electrical grid comprising, alongside electrical loads, at least one regenerative energy generator, at least one conventional generator operated by fossil fuels, and at least the electrical charging station for storing and re-emitting electrical power, wherein the charging station is controlled in such a way that the feed-in power is limited in terms of its change over time.

The invention discloses a slender pipe part single-piece independent power supply and flowing chromium plating device. The slender pipe part single-piece independent power supply and flowing chromiumplating device comprises an upper support, a lower support, a slender pipe and an anode steel wire and further comprises an upper support lifting mechanism, an anode steel wire tensioning mechanism, an independent power supply system, a pipeline circulation system, an electroplating bath, and a control system, wherein the upper support lifting mechanism is fixedly installed on one side of the upper support and used for driving the upper support to move and clamping or loosening the slender pipe; the anode steel wire tensioning mechanism is arranged below the lower support and is used for clamping an anode steel wire; the independent power supply system is arranged beside the lower support, the positive electrode of a power supply is connected with the anode steel wire tensioning mechanism,and the negative electrode of the power supply is connected with the lower support to provide independent power supply to the single-piece slender pipe; the pipeline circulation system and the electroplating bath are arranged beside the upper support and the lower support, and the pipeline circulation system is used for connecting the upper support, the lower support and the electroplating bath to form an electroplating liquid flowing circulating loop; and the control system controls the upper support lifting mechanism to move up and down and controls the independent power system, the pipeline circulation system and the anode steel wire tensioning mechanism to be started or stopped. The device has a self-centering function, and automatic production is convenient to implement.

This is a water cleansing system intended for very low technology primitive communities buildable for between $600 and $1,000 of parts with labor extra. A gravity feed system is contemplated with an initial filtering stage(s), a settling stage, a UV treatment stage, and an ozonator stage. Other filtering is useful and a stand-alone power system with solar power needing no infrastructure is contemplated to enhance purification. The objective is to improve water quality from the worst of conditions; and under some conditions to end up with clean water of a quality found in developed countries with mature water systems.The general principle is that if water had to be carried to the site in communities with low precipitation, the water brought in would be emptied into the initial stage of the water cleansing system, and the person who brought the water would draw from the last stage an equal amount or high percentage of the amount of water carried in.The system is fully scalable in size, but one key is that it can serve at a very inexpensive cost, a small group of people.

The invention discloses a distribution-typed serial composite dynamic system of electric automobile, which is composed of paralleling inverters [3], [4] and generator G, wherein the two-path motor driving part is composed of inverters [1], [2], contactor box C and generators [M1], [M2]; the inverters [1], [2] connect contact box C and two driving motors [M1] and [M2] through controllable switch; the generating part adopts controllable commutating pattern, which uses the same quantity or more BUCK inverters as topological structure; the control unit IPCU of individual power system controls exchange of generating part and driving part.

The invention relates to a storage battery energy storage conditioning device, which is characterized by comprising at least two charging and discharging management systems and a main system monitor, wherein the AC sides of the charging and discharging management systems are connected with a public bus-bar in parallel, and then are connected with a high voltage main bus-bar through a transformer, and the DC side of each charging and discharging management system is connected with a storage battery so as to control the two-way conditioning of active power and reactive power of the storage battery and PCC points formed by the main bus-bar and the public bus-bar in a range of upper limit and lower limit voltage values, so that the voltage and frequency of the PCC points are stable; and the main system monitor is in information interaction with the charging and discharging management systems through a plurality of CAN interfaces, and controls an external standby power to supply power to the high voltage main bus-bar or control unloading charges to consume electric energy output by the high voltage main bus-bar according to the instructions of the charging and discharging management systems, so that the voltage and frequency of the PCC points are stable. The invention is easy to realize, saves cost, and is suitable for combining an independent power system with a megawatt-class wind generating unit, and supplying power to offshore oilfield platforms and remote areas.

The invention provides an electromagnetic wave transmission method of information of logging instruments, wherein electromagnetic waves are used for transmitting logging data wirelessly; a wireless transmitting / receiving device connected with an information acquisition device of each logging instrument is arranged at the underground logging instrument; data acquired by the underground information acquisition devices is transmitted to the ground by the wireless transmitting / receiving devices; after being received by a ground instrument on the ground, the data is decoded and reduced into various types of dynamic data; the data materials are transmitted to a data processing terminal to be analyzed and displayed; all the underground logging instruments contact one another through wireless communication, and each underground logging instrument is provided with a wireless transmitting / receiving device for mutually communicating with other instruments and communicating with the ground instrument; and an independent power supply system and a sensor data acquisition system are arranged at each underground logging instrument. The method not only ensures the independency of all instruments, but also better solves the mutual communication problem of the instruments and realizes integral communication of the instruments; moreover, each instrument is provided with an independent power supply system, thereby avoiding the situation that the operation of other instruments is affected when on instrument has a fault.

The invention provides an intelligent mailbox system and a control method thereof. The intelligent mailbox system comprises a single-chip microcomputer system, an infrared induction system, a radio frequency identification unlocking system, a buzzer warning system, an LED display system, an independent power source system and a GSM communication system. The intelligent mailbox system and the control method thereof have the advantages that a short message is automatically sent to inform a user; when the system detects a letter, the user can be reminded in time, the user can conveniently fetch the letter fast in time, time is saved, and efficiency is improved; user identity authentication is achieved through radio frequency identification, the mailbox system is designed based on the VIP theory, each mailbox corresponds to a radio frequency card, the safety of the letter is improved, and the probability of losing the letter is greatly reduced.

Superconducting machine (1), in particular for use as a generator in a stand-alone power system, comprising, as component parts, a stator (5) and a rotor (2) capable of rotating with respect to the stator (5), - wherein at least one superconducting coil (3) for generating at least two magnetic poles is provided on at least one component part, in particular the rotor (2), which superconducting coil is cooled via a cooling device (4), and - at least two parallel winding elements (6) are provided on the respective other component part, in particular the stator (5), in the armature winding for each phase, which winding elements can be connected either in series or in parallel via at least one switching means (7).

The invention particularly relates to a wind, light and temperature complementation intelligent hybrid power generation system for a train or a bullet train. The problem that electric energy consumption on the train and the bullet train is high is solved. The wind, light and temperature complementation intelligent hybrid power generation system for the train or the bullet train comprises a temperature difference power generation sheet, a wind driven generator and a solar cell panel array which are arranged on the top of the train or the bullet train. The temperature difference power generation sheet is connected with a temperature difference controller, a steering engine is arranged below the wind driven generator, the wind driven generator is connected with a wind turbine controller, the solar cell panel array is connected with a photovoltaic controller, the temperature difference controller, the steering engine, the wind turbine controller and the photovoltaic controller are connected to a direct current control center, the direct current control center is connected to a storage battery, the direct current control center are connected to a direct current load and an alternating current load, and specifically, the direct current control center is connected to the alternating current load through an inverter. The wind, light and temperature complementation intelligent hybrid power generation system discharges no pollutant or emission, is efficiency and convenient to use, is an independent power source system with the best resource conductions, and well complements power supply of the train or the bullet train.

The invention discloses an organic solar intelligent independent power system, which comprises a solar battery panel, a solar controller, an energy storage battery, an inverter, a power management part, a user-oriented programmable controller, a motor driving part, a sensor, an electric ceiling, an electric overturning ceiling system and a light emitting diode (LED) lighting lamp. The organic solar intelligent independent power system has higher sunlight utilization efficiency, higher generation efficiency and high degree of intelligence, utilizes natural conditions, and is energy-saving, environment-friendly, elegant in appearance, convenient to install, lower in system cost, and wider in application range. The solar battery panel is an organic flexible solar battery panel, and the sensor comprises a temperature sensor, a humidity sensor and a photosensitive sensor. An indoor environment regulation and intelligent independent power system, which is self-powered, intelligent, energy-saving and environment-friendly, is formed by combining the solar battery panel, the electric ceiling, the electric overturning ceiling system and an indoor regulation system.

The invention discloses a parallel operation control method for a DC power generation system of a double-winding induction generator, belongs to the technical field of power generation, power transformation or power distribution, and especially relates to a parallel control method for a ship independent power system. The method comprises the steps: controlling a main power generator to stably output a direct current according to a DC voltage given value; updating a no-load voltage of a slave power generator through the DC voltage given value and the active power, required to be outputted, of the slave power generator; updating the quantity of an actual output offset DC voltage given value of the slave power generator through the no-load voltage updating value of the slave power generator and the actual output active power of the slave power generator; controlling the salve power generator to output a direct current according to the quantity of the actual output offset DC voltage givenvalue of the slave power generator, and executing the parallel operation when two power generators stably output DC voltage given values. The method can give play to the advantages of a double-windinginduction motor in an independent power system, does not need to increase the size of the generator in actual operation while reducing the parallel control difficulty, and can be suitable for the parallel operation of the double-winding induction generator in the fields of spaceflight and ships.