31results about How to "Guaranteed maximum power output" patented technology

A present invention relates to a novel hybrid intelligent control system and method for power generating apparatuses, in which the control system comprises: a fuzzy sliding mode speed controller, embedded with a fuzzy inference mechanism so as to be used for controlling the speed of a power generating apparatus; and a radial basis function network (RBFN) pitch controller, being embedded with an on-line training RBFN so as to be used for controlling the pitch angle of a turbine coupled to the power generating apparatus. In a variable-speed energy conversion system using the aforesaid control system, the turbine can be driven to operate at its maximum efficiency by adjusting its blade pitch angle in response to the variation of the input flowing into the turbine, while allowing the shaft speed of the power generating apparatus to be controlled by a fuzzy interference mechanism so as to achieve its maximum power output.

This invention provides a heat engine based on the well-developed structure of internal combustion engines. The heat engine comprises at least a piston and cylinder assembly and at least two heating chambers associated with said piston and cylinder assembly to provide a significantly increased time period for heat transfer from a heat source to the gaseous working of the engine without increasing the number of strokes per power stroke in a cycle. Each said heating chamber has therewithin a heat exchanger unit that facilitates heat transfer from the heating source to the working fluid, such as air, substantially under a constant volume, a port leading to said cylinder space, and a heating-chamber valve, said valve opening or closing the port to establish or block communication between said heating chamber and cylinder space. For a heat engine utilizing intake and discharge strokes respectively for intake and discharge purposes, each said heating chamber in a cycle has an associated intake stroke, a compression stroke, a power stroke, a discharge stroke, and between said compression and power strokes a time period of 4(n−1) strokes available for heat transfer from the heat source to the working fluid enclosed within said heating chamber while the piston serves the working fluid associated with another heating chamber, where n is the number of the heating chambers per piston / cylinder assembly. For a heat engine utilizing a scavenging process for intake and discharge purposes, each said heating chamber in a cycle has an associated scavenging process to facilitate the discharge and intake of the working fluid, a compression stroke, a power stroke, and between said compression and power strokes a time period of 2(n−1) strokes available for heat transfer from the heat source to the working fluid enclosed within said heating chamber while the piston serves the working fluid associated with another heating chamber, where n is the number of the heating chambers per piston and cylinder assembly. Additionally, a heat engine based on a rotary internal combustion engine as well as the techniques using heat pipes to cool a rotary engine is disclosed.

The invention discloses a voltage frequency adjustment method considering photovoltaic maximum power tracking for an active power distribution network. The voltage frequency adjustment method comprises the following steps of acquiring a reference voltage V<mpp> of a photovoltaic cell in a maximum power running mode; acquiring a DC voltage V<dc> output from the photovoltaic cell; carrying out frequency adjustment on the DC voltage V<dc> to obtain a frequency adjustment quantity Delta Omega; calculating an average value P of active power and an average value Q of reactive power output from a photovoltaic inverter; calculating a droop coefficient of a self-adaptive droop control; obtaining a reference voltage amplitude U<*> and a reference angular frequency Omega' output from an AC side of the photovoltaic inverter after considering the self-adaptive droop control of a circuit impedance factor; obtaining a reference angular frequency Omega' after frequency adjustment; and calculating an input signal U<ref> of a pulse width modulation (PWM) driving circuit of the photovoltaic inverter. By the voltage frequency adjustment method, distributed photovoltaic maximum power can be ensured to be output, and meanwhile, the influence of the circuit impedance is considered; and when a load or an environment changes, active power and reactive power can be accurately allocated to the photovoltaic inverter, and the purpose of improving the reliability of distributed photovoltaic power supply is achieved.

The invention discloses a voltage coordinated control method of a DC power distribution network. By real-time monitoring of a master convertor station, a slave convertor station and a storage battery on port voltage and power, effective control on the voltage of the DC power distribution network is achieved, and system power balance is ensured. When the DC power distribution network is normally running, a draught fan and a photovoltaic cell both run in a maximum power tracking mode to ensure maximum power output of a new energy source; the control switching condition of each power device is determined by local information quantity and does not rely on communication, and decentralized self-discipline control on each power device is achieved; in a transient-state running mode, the storage battery rapidly charges and discharges to ensure seamless switching of a control strategy when nodes for controlling DC voltage are controlled to be switched between the master convertor station and the slave convertor station; and the control strategy considering constraint conditions such as DC voltage offset quantity, grid-connected device capacity and a state of charge (SOC) of the storage battery, and the high reliability of system running is ensured.

The invention relates to a method for designing a frequency controller of an independent micro-grid. The method comprises the following steps of: establishing a mathematical model of a power generation system of the independent micro-grid, wherein the independent micro-grid comprises a photovoltaic power generation system and a diesel engine system hybrid power supply system; establishing a photovoltaic system mathematical model; establishing a diesel engine mathematical model comprising load disturbance; and designing an interference observer and a sliding mode controller. The output power of a diesel engine generator is regulated to reduce micro-grid frequency deviation caused by a load change and the power fluctuation of a photovoltaic system. By a designed sliding mode load frequency compensation controller, the micro-grid frequency deviation can be reduced, the maximal power output of the photovoltaic system is ensured, and the utilization rates of renewable energy sources are increased.

A diaphragm for a micro-electroacoustic transducer, includes a first layer including an exposed region and a covered region, and a second layer. The second layer overlaps the covered region of the first layer to thereby increase the rigidity of the diaphragm. The covered region is surrounded by the exposed region.

The invention provides a method for testing a specific absorption rate of a TD-LTE mobile phone. Linear scaling processing is performed on an SAR value measured under a non-maximum duty ratio to scientifically and accurately evaluate the SAR value level of the TD-LTE mobile phone. According to the method provided by the invention, the existing test system and test method standards are maximally used, thereby avoiding large-scale system upgrade and standard amendment. Meanwhile, by adoption of the test method provided by the invention, the defect of a relatively large error resulting from the fact that the SAR test is performed on the TD-LTE mobile phone under limit working conditions is avoided, and the SAR test precision is improved, so that the detection and authentication risks of the TD-LTE mobile phone are effectively reduced.

The invention discloses a microsatellite energy system which comprises a solar array, a charging management unit with MPPT (maximum power point tracking), a voltage transformation unit, a battery management unit and an electric storage unit. The charging management unit with the MPPT is connected with the solar array and is used for setting output voltage of the solar array to output maximum power; the voltage transformation unit is connected with the charging management unit with the MPPT and is used for converting the output voltage of the charging management unit with the MPPT into voltage needed by loads; the battery management is connected with the charging management unit with the MPPT and the electric storage unit respectively and is used for receiving the output voltage of the charging management unit with the MPPT and outputting the output voltage identical to the electric storage unit. The microsatellite energy system has the advantages of being simple in structure, low in energy consumption, controllable in charging and discharging and the like.

A motor includes a cylindrical housing, a cooling fan, and a rotating shaft. The cylindrical housing defines at least one upstream through hole at its circumferential wall. The cooling fan is mounted at the rotating shaft for generating airflow towards the cylindrical housing for dissipating the heat generated in the motor. The hollow hood is mounted to the cylindrical housing such that a head portion is located above the upstream through hole, thus defining an annular air-guiding channel therebetween, which can receive the airflow generated by the cooling fan and guide the airflow to enter the cylindrical housing via the upstream through holes, so that the heat generated therein can be dissipated effectively. Thus, heat is not easy to accumulate in the motor, and the performance and service life of the motor can be increased.

In a double drive shaft motor, a stator and a field rotor are arranged at a radially outer side of a magnetic modulation rotor. The stator and the field rotor are arranged in series in an axial direction of the motor. This structure increases an amount of a winding coil of the stator and magnets in the field rotor, and an output torque of the motor. When a field magnetic flux passes through soft magnetic material members in the magnetic modulation rotor, because the generation and the reception of the magnetic flux can occur at a radially same side of the magnetic modulation rotor, this structure cancels an eddy current generated in the soft magnetic members and supporting members made of non-magnetic metal which tightly support the soft magnetic member. This structure provides a reduced axial size of the motor with high performance.

A power control system provides an output power control for a generator. The power control system includes a power conversion unit, a sensing unit, a load-dumping unit, and a control unit. The power conversion unit receives and converts a current and a voltage, generated from the generator, to supply a load. The sensing unit receives the current and the voltage to produce a current signal and a voltage signal. The load-dumping unit is connected to the generator and the power conversion unit. The control units receives the current signal and the voltage signal, produces a current control signal to control the power conversion unit, and generates a voltage control signal to control the load-dumping so as to control the output power of the generator.

The invention discloses a charge control method of a low-power independent photovoltaic generating system, belonging to the technical field of photovoltaic power generation. In the method, the charge efficiency of the independent photovoltaic generating system is improved by fully utilizing the output characteristic of the photovoltaic battery array and the charge characteristic of the lead-acid storage battery, optimum matching of the photovoltaic battery array and the lead-acid storage battery is realized, meanwhile, the acceptable charge current of the lead-acid storage battery is strengthened through self discharge of the lead-acid storage battery and the lead-acid storage battery is ensured to completely absorb the electric energy output by the photovoltaic battery array during charging, thus achieving the aim of improving the charge efficiency of the independent photovoltaic generating system.

This invention provides a method to produce an electrode sheet adaptable to high-temperature drying and to charge and discharge under high voltage, by coating a collector with a slurry which comprises electrode active material, electroconductive agent, binder and solvent, and then drying the same, wherein meta-aramid is used as binder, and wherein thus dried electrode sheet is compressed.

A rotary electromagnetic machine is described which comprises first and second substantially cylindrical parts arranged to move relative to each other about a common axis. The first cylindrical part produces a spatially periodic radial magnetic field across an air gap, the magnetic field having a regular alternating polarity around the circumference of the first cylindrical part. The second cylindrical part comprises at least one laminar electrical conductor wrapped into cylindrical form and placed in the air gap to intercept the magnetic field, the laminar electrical conductor comprising a regular pattern of electrically conductive paths within the air gap. In more general terms, rotary motors in which the wire coils are replaced by laminations of material in which patterned conducting paths are created are described. The conducting laminations are placed in the air gap between an mature and backing iron that is constructed so as to reduce eddy current losses.

The present invention provides a thermoelectric micro-supercapacitor integrated device comprising: a thermoelectric power generation module comprising a thermoelectric unit body including a thermoelectric channel interposed between two different heat sources and disposed on a substrate, the thermoelectric channel being composed of an n-type or p-type semiconductor; and a micro-supercapacitor module configured to be operated in cooperation with the thermoelectric power generation module and including a pair of collector electrodes between which an electric potential difference is generated through the thermoelectric channel.

A power amplifying converter comprises a multi-balanced-unbalanced converting unit, a plurality of power amplifying units, a plurality of dual-path power combining units and a differential power combining unit. The multi-balanced-unbalanced converting unit is provided with a first input / output end and a plurality of second input / output ends. Each of the power amplifying units is provided with a first input end electrically connected to the second input / output end, and a first output end. Each of the dual-path power combining units is provided with two second input ends electrically connected to the first output ends, and a second output end. The differential power combining unit is provided with two third input ends electrically connected to the second output ends, and a third output end. In this case, the multi-balanced-unbalanced converting unit is made up of a plurality of 1 / 12 wavelength transmission lines.

The invention relates to a battery output power control method and device and a battery power supply system, which are applied to a controller connected with the input of a battery, the battery output power control method comprises the following steps: S1, before the battery is connected to a load for conduction, obtaining the output voltage of the battery and a plurality of working voltage intervals corresponding to the load, obtaining a plurality of working current values corresponding to the plurality of working voltage intervals; s2, confirming a working voltage interval corresponding to the output voltage to obtain a corresponding working current value as a target current value; s3, when the battery is connected to the load and is conducted, setting the output current of the battery to be an initial current value, wherein the initial current value is smaller than any working current value; and S4, adjusting the output current of the battery to a target current value according to a first preset step. According to the invention, the maximum power output of the battery can be ensured.

A power generating device comprising at least a gravity pressurizing device rotatably connected to a base, the power generating device has on its one end a restraining and pressing portion; when the gravity pressuring device is rotated on the base, it pushes the push-pressing portion on one end of a moving-to-and-fro linking member to render moving of the moving-to-and-fro linking member, a power outputting portion on the other end of the moving-to-and-fro linking member outputs energy for supplying energy source for various power equipment.

The invention relates to a BIPV intelligent chip photovoltaic module and a packaging process thereof, the BIPV intelligent chip photovoltaic module comprises a BIPV module, front plate toughened glass, intelligent chip boxes and back plate toughened glass, the BIPV module comprises a plurality of battery strings, each battery string is formed by connecting a plurality of solar battery pieces in series, one intelligent chip box is arranged between two adjacent battery strings at the left part, and the back plate toughened glass is arranged on the back plate toughened glass. Another intelligent chip box is also arranged between two adjacent battery strings at the right part; an intelligent chip is arranged in the intelligent chip box, a bus bar is arranged at the left end of the intelligent chip and extends out of the intelligent chip box to be connected with an adjacent solar cell, and a bus bar is arranged at the right end of the intelligent chip and extends out of the intelligent chip box to be connected with an adjacent solar cell. According to the invention, the intelligent chip is packaged in the photovoltaic module, and the chip is connected in series with the two columns of battery pieces, so that the power optimization of the sub-cascade crystalline silicon battery pieces is realized, the output of electric energy is increased, the reliability of the module is enhanced, the BIPV of the crystalline silicon intelligent photovoltaic module is realized, and the photovoltaic module can be installed on each building elevation.

The invention discloses a high-efficiency control system and a control method of a brushless motor with a wide working area, which are used in energy systems of aerospace vehicles. The system of the present invention includes a power supply module, a first DC-DC circuit, a battery pack, a second DC-DC circuit, an anti-reverse circuit, ESC, BLDC, an airborne controller, and a communication link. The electric energy from the power supply module charges the battery pack through the first DC-DC circuit, the electric energy of the battery pack passes through the second DC-DC circuit in turn, and the anti-reverse circuit supplies power to the ESC, wherein the output voltage of the second DC-DC circuit, the ESC The throttle signal input is controlled in real time by the on-board controller according to the power demand of the aircraft; the high-efficiency control system of the brushless motor with a wide working range of the present invention is suitable for the control of brushless motors with a large power demand range such as long-endurance drones. The system can realize the efficient power output of the whole power system in a wide working area.

A cylinder for an internal combustion engine having co-annular dual pistons. The cylinder has a main cylinder having a main cylinder wall and a cylinder head, a first or outer piston having an annular crown, an inner cylinder wall that defines an inner cylinder, and an annular outer sidewall extending from the periphery of the crown, an inner piston having a crown, and an annular inner sidewall extending from the periphery of the crown. A solenoid-actuated pin selectively secures the outer piston with the main cylinder during a portion of each cylinder cycle. The inner piston reciprocates within the inner cylinder during both the air inlet and compression strokes, while the outer piston reciprocates within the main cylinder only during the power stroke and the exhaust stroke, to increase the piston crown surface area exposed to the combustion gases to maximize the power and efficiency.

The invention discloses a voltage frequency adjustment method considering photovoltaic maximum power tracking for an active power distribution network. The voltage frequency adjustment method comprises the following steps of acquiring a reference voltage V<mpp> of a photovoltaic cell in a maximum power running mode; acquiring a DC voltage V<dc> output from the photovoltaic cell; carrying out frequency adjustment on the DC voltage V<dc> to obtain a frequency adjustment quantity Delta Omega; calculating an average value P of active power and an average value Q of reactive power output from a photovoltaic inverter; calculating a droop coefficient of a self-adaptive droop control; obtaining a reference voltage amplitude U<*> and a reference angular frequency Omega' output from an AC side of the photovoltaic inverter after considering the self-adaptive droop control of a circuit impedance factor; obtaining a reference angular frequency Omega' after frequency adjustment; and calculating an input signal U<ref> of a pulse width modulation (PWM) driving circuit of the photovoltaic inverter. By the voltage frequency adjustment method, distributed photovoltaic maximum power can be ensured to be output, and meanwhile, the influence of the circuit impedance is considered; and when a load or an environment changes, active power and reactive power can be accurately allocated to the photovoltaic inverter, and the purpose of improving the reliability of distributed photovoltaic power supply is achieved.

The invention discloses a wide-working-domain brushless motor efficient control system and a control method, which are used for an aerospace vehicle energy system. The system comprises a power supplymodule, a first DC-DC circuit, a battery pack, a second DC-DC circuit, an anti-reverse circuit, an ESC, a BLDC, an airborne controller and a communication link. Electric energy from the power supply module charges the battery pack through the first DC-DC circuit. The electric energy of the battery pack supplies power to the ESC through the second DC-DC circuit and the anti-reverse circuit in sequence, and the output voltage of the second DC-DC circuit and the accelerator signal input of the ESC are controlled in real time by the airborne controller according to the power demand of the aircraft. The wide-working-domain brushless motor efficient control system is suitable for brushless motor control systems with large power requirement ranges such as long-endurance unmanned aerial vehicles,and efficient power output of the whole power system can be kept in the wide working area.

The invention discloses a voltage coordinated control method of a DC power distribution network. By real-time monitoring of a master convertor station, a slave convertor station and a storage battery on port voltage and power, effective control on the voltage of the DC power distribution network is achieved, and system power balance is ensured. When the DC power distribution network is normally running, a draught fan and a photovoltaic cell both run in a maximum power tracking mode to ensure maximum power output of a new energy source; the control switching condition of each power device is determined by local information quantity and does not rely on communication, and decentralized self-discipline control on each power device is achieved; in a transient-state running mode, the storage battery rapidly charges and discharges to ensure seamless switching of a control strategy when nodes for controlling DC voltage are controlled to be switched between the master convertor station and the slave convertor station; and the control strategy considering constraint conditions such as DC voltage offset quantity, grid-connected device capacity and a state of charge (SOC) of the storage battery, and the high reliability of system running is ensured.

Disclosed is a piezoelectric power supply converter, wherein, a piezoelectric element is utilized to replace a conventional capacitor, due to characteristic of mechanical resonance of said piezoelectric element, said piezoelectric element may contain higher capacitance than said conventional capacitor, and a parasitic resistance of said piezoelectric element is smaller that that of an ordinary capacitor. Through a resonance between an externally added inductive element and a piezoelectric-capacitor and said resonance of said piezoelectric element itself, said piezoelectric element is capable of transmitting electrical energy efficiently, thus achieving large output power. Therefore, said piezoelectric-capacitor is capable of improving shortcomings of said conventional capacitors of low voltage endurance, large leakage current, and small output power.

The present invention provides a high-voltage pulse power supply for generation of plasmas through liquid phase discharge. The pulse power supply comprises a direct-current high-voltage generation circuit, a high-voltage inversion main circuit and a high-circuit inversion control circuit, the high-voltage source output end of the direct-current high-voltage generation circuit is connected with the power supply input end of the high-voltage inversion main circuit, the high-circuit inversion control circuit is connected with the control end of the high-voltage inversion main circuit, and a power switch device in the high-voltage inversion main circuit is formed by connection in series of a plurality of power IGBT tubes. The high-voltage pulse power supply for generation of plasmas through liquid phase discharge is long in life, stable and small in noise, etc.

The invention relates to a wind-solar complementary off-grid and grid connection dual-mode system. Mostly, a solar cell panel in a traditional grid connection type wind-solar complementary controller is in a fixed power supply mode, the solar cell panel cannot track the incident angle of sunlight in real time, and the utilization rate of solar energy is low. A power grid voltage is mostly used as a given feedback current in a grid connection feedback mode, the feedback current can contain plenty of harmonic components due to power grid voltage distortion, and accordingly electric network pollution can happen. The wind-solar complementary off-grid and grid connection dual-mode system comprises a solar cell circuit set and a wind generating set. The solar cell circuit set and the wind generating set are sequentially connected with a DC-DC boosting voltage stabilizer (4) and a three-phase inverter circuit (5) respectively. The wind-solar complementary off-grid and grid connection dual-mode system is used for wind-solar generating complementation.

The invention relates to a method for designing a frequency controller of an independent micro-grid. The method comprises the following steps of: establishing a mathematical model of a power generation system of the independent micro-grid, wherein the independent micro-grid comprises a photovoltaic power generation system and a diesel engine system hybrid power supply system; establishing a photovoltaic system mathematical model; establishing a diesel engine mathematical model comprising load disturbance; and designing an interference observer and a sliding mode controller. The output power of a diesel engine generator is regulated to reduce micro-grid frequency deviation caused by a load change and the power fluctuation of a photovoltaic system. By a designed sliding mode load frequency compensation controller, the micro-grid frequency deviation can be reduced, the maximal power output of the photovoltaic system is ensured, and the utilization rates of renewable energy sources are increased.

The invention discloses a photovoltaic converter network construction control method and device based on model prediction control, and the method comprises the steps: collecting the photovoltaic input voltage and current of a DC side, the output voltage and current of an AC side, and the current of an AC filter at the current moment of a photovoltaic converter, and building a prediction model of the photovoltaic converter; calculating a photovoltaic predicted voltage and an AC predicted voltage at the next sampling moment; according to the photovoltaic output state and the current AC voltage amplitude, determining the operation mode of the photovoltaic converter and the AC voltage reference value at the next sampling moment; and finally, designing a cost function to track an output voltage reference value, and adding a penalty function into the cost function to abandon the switching state which does not meet the requirement. According to the invention, when the photovoltaic output of the photovoltaic converter is sufficient, the AC voltage is independently constructed, and the network construction control is realized; and when the photovoltaic output is insufficient and cannot meet the load demand, the photovoltaic converter adaptively adjusts the amplitude of the output voltage, stabilizes the frequency of the output voltage, and maintains the maximum photovoltaic power output.