98results about How to "Increase active power" patented technology

The invention belongs to the technical field of wind power generation, and discloses a comprehensive control system adopting a doubly-fed wind generator participated in power grid primary frequency modulation. The control system comprises a rotor rotary speed control module, a simulation inertia control module, a droop control module, a rotary speed protection and power determination module and apitch angle control module. After the wind generator is participated in frequency modulation, the power grid inertia is equivalently enlarged, so that the doubly-fed asynchronous wind generator can have inertia response on the power grid frequent as the conventional synchronous generator, thereby lowering change rate of the power grid frequency; and by controlling the rotary speed and the pitch angle, the wind generator output is lowered, so that the wind generator has certain active backup capacity to be participated in primary frequency modulation, thereby lowering steady-state error of thefrequency.

The invention discloses a new-energy connected-grid power control method based on prediction and adjustment performance and safety constraint and belongs to the technical field of electric-power system scheduling operation and control. According to control performance-price-ratio indexes of power-gird safety stability margin changes by new-energy-power-station connected-grid power control at a current moment, the new-energy connected-grid power control method divides new-energy power stations into a plurality of power-station groups which are approximate in control performance-price-ratio index so that a problem that grouping of the new-energy power stations according to the difference of connection power transmission channels can not reflect truly current transient and dynamic safety stability characteristics of a power grid is solved. The new-energy connected-grid power control method based on the prediction and adjustment performance and the safety constraint is capable of improving instantaneity, reliability and precision of new-energy power-station connected-grid active-power limitation and instantaneity, reliability and precision of new-energy power-station connected-grid active-power improvement and activeness of new-energy power-station connected-grid active-power prediction and control technology equipped level improvement.

The invention relates to a heat pump type clothes dryer which comprises a control system, a refrigeration system and an air circulation system, wherein the refrigeration system consists of a compressor, a condenser, an evaporator and a throttle valve, the air circulation system consists of a clothes drying barrel, an evaporator, an evaporator fan, a condenser, a condenser fan, a humid heat air flow passage, a low-temperature dry air flow passage and a dry air flow passage, the humid heat air flow passage is arranged between the clothes drying barrel and the evaporator, the low-temperature dry air flow passage is arranged between the evaporator and the condenser, the dry air flow passage is arranged between the condenser and the clothes drying barrel, the compressor is a variable-frequency compressor and comprise a first condenser and a second condenser group which are connected in series, and the output end of the first condenser is also provided with a by-pass pipeline so that refrigerants can selectively flow to the throttle valve through the by-pass pipeline. The heat pump type clothes dryer can be used for high temperature dehumidification in high moisture content, can be used for medium temperature dehumidification in low moisture content and has obvious energy saving effect.

The invention provides an adaptive tuning device and tuning method of emission end of a wireless electric power transmission device. An alternating current power supply, a rectification filtering circuit, a high-frequency inversion circuit, a voltage detection device, an LC adjustable network, a compensation capacitor CP, an emission coil LP, an emission end impedance RP and a current detection device are successively connected together. A controller receives current and output of the current detection device and calculates and controls the high-frequency inversion circuit and the LC adjustable network. Two full-controlled devices M1 and M2 are serially connected with diodes D1 and D2, then are reversely parallelly connected with each, then are serially connected with a fixed inductor LT and then are parallelly connected with a power common capacitor CT, so a phase-controlled inductor capacitor parallel circuit is formed. S1 and S2 are square waves for the LC control circuit to controlon and off the M1 and M2. According to the invention, stability of the energy transmission system can be improved; and defects that the current wireless energy transmission system is easily detuned and an emission device fails to transmit energy to various kinds of receiving ends are solved.

The invention provides an identifying method and a device of abnormal pitch change of a wind turbine generator system. The method comprises the steps of: obtaining a pitch angle signal of each blade; and determining if the abnormal pitch change occurs according to the pitch angle signal of each blade, wherein the abnormal pitch change comprises the pitch angle jump or the pitch angle desynchrony. The method can quickly identify the abnormal pitch change state, in particular the pitch angle jump or the pitch angle desynchrony when the wind turbine generator system is located in the abnormal pitch change state before the pitch change failure, so that the abnormal pitch change state can be timely treated, the damage of such key parts as a pitch change motor is effectively prevented, and the active power output by the wind turbine generator system is effectively improved.

Controlling a wind turbine during a grid fault where the grid voltage drops below a nominal grid voltage. After detection of a grid fault, the total current limit for the power converter output is increased to a total maximum overload current limit. Depending on whether active or reactive current generation is prioritized, an active or reactive current reference is determined. The active current reference is determined in a way so that a reduction in active power production due to the grid voltage drop is minimized and based on the condition that the vector-sum of the active output current and the reactive output current is limited according to the total maximum overload current limit, and a maximum period of time is determined in which the power converter can be controlled based on the active / reactive current references. Afterwards the power converter is controlled based on the active and reactive current references.

The invention discloses an ultrasonic control circuit capable of generating ultrasonic waves. The ultrasonic control circuit comprises a square wave generation circuit, the square wave generation circuit comprises a phase-locked loop logic chip and an adjustable resistor, wherein the phase-locked loop logic chip comprise a series resistor accessing end and is used for generating pulse width modulation square waves; and the adjustable resistor is connected in series between the series resistor accessing end and the ground and used for adjusting the output frequencies of the pulse width modulation square waves. The invention also provides a dirt removing device applying the ultrasonic control circuit. The output frequencies of the pulse width modulation square waves are adjusted by changing the resistance of the adjustable resistor, so that the ultrasonic control circuit can be suitable for the resonance point oscillation of different ultrasonic transducers, thereby realizing the maximum value of power output to enable dirt removing and washing effect to be better. The ultrasonic control circuit is applied to a washing machine, and water sprays gushed from a washing machine pump are transformed into water vapors for dirt and dust removal by the ultrasonic waves, therefore washing efficiency is enhanced.

The present invention discloses a dynamically tuning device and a tuning method for the sending terminal of a wireless electric energy transmission device, and relates to the technical field of wireless electric energy transmission. The primary side of the dynamically tuning device is provided with a phase detection device PD, a BUCK circuit, a control unit CU and a rectifier bridge. According to the detected phase difference state, the resonant state is judged. Meanwhile, the real-time tuning is realized through adjusting the equivalent output resistance of the BUCK circuit. As a result, the primary side can be maintained to run at a minimum voltage phase difference and a minimum current phase difference. That means, a primary side circuit is closer to the completely resonant state, so that the active power of the sending terminal is improved. Furthermore, the transmission power and the transmission efficiency of the wireless electric energy transmission device are improved.

The embodiment of the invention provides an identification method and device for the wind-generating-set variable pitch abnormality. Blade operating parameter signals of a wind generating set are obtained; the operating parameter signals are subjected to fast fourier transformation; the frequency-domain characteristic quantity of the operating parameter signals after fast fourier transformation isextracted; whether the variable pitch abnormality occurs or not is determined according to the frequency-domain characteristic quantity, and according to the frequency-domain characteristics of the operating parameter signals of blades with the variable pitch abnormality, before variable pitch faults of the wind generating set occur, and when the wind generating set is in the variable pitch abnormal state, the variable pitch abnormal state can be rapidly identified, the variable pitch abnormal state can be thus eliminated, damage to key parts such as a variable pitch motor is effectively prevented, and the active power output by the wind generating set is effectively improved.

The invention discloses a charging circuit for lead acid batteries with high power factors, which comprises a rectifying circuit, a power conversion circuit and a charging management circuit, wherein the rectifying circuit is coupled with the power conversion circuit; the power conversion circuit is coupled with the charging management circuit; the power conversion circuit comprises a control chip; the control chip is coupled with a power transformer and an MOS tube switching circuit; and the model of the control chip is SG6961. The power conversion circuit of the charging circuit for the lead acid batteries with high power factors realizes the combination of a PFC control circuit and a PWM control circuit, thus the invention has the advantages of simple circuit structure, cost reduction and very high conversion efficiency, and can increase the active power sent by generating equipment and transformation equipment, enable power supply equipment to fully play a role, improve the utilization ratio of an AC power source, reduce the current on power transmission lines, lower voltage drop and power loss on transmission lines and save electric energy.

A method for stabilizing particulate peroxycarboxylic acids, in particular imidoperoxycarboxylic acids, (such as, e.g., PAP), which are solid at an ambient temperature in a preferably aqueous dispersion containing surfactants. The dispersion is established in such a way that in the dispersed state a degradation of the peroxycarboxylic acids in the dispersion is prevented or at least reduced or retarded, or that the solubility of the peroxycarboxylic acids in the dispersion is diminished, in particular by minimizing the halide ion content, reducing the pH value to pH values ≦7, minimizing the content of free or active surfactants, minimizing the content of non-ionic surfactants, adding complexers, adding catalases or adding a solvent with a low solubility capability for peroxycarboxylic acids etc.

The invention discloses a control system and method of a direct current load system in response to a frequency modulation requirement of a power grid in a manner of intervals. The system comprises a main circuit system and a control system, the main circuit system comprises a rectification module, a DC / DC module and a direct current load, the control system comprises rectifier control, DC / DC control and direct current voltage droop control, the system performs frequency modulation in the manner of intervals through voltage droop control of the direct current load, and the work mode comprises five operation modes including constant-voltage operation, boosted frequency modulation, voltage-reduction frequency modulation, under-voltage protection and overvoltage protection. According to the system and method, the terminal voltage of the direct current load and the frequency of the power grid are coupled, a rectifier load participates in a frequency modulation process of the power grid as much as possible in the condition of satisfying safe operation and basic operating requirements so that the stability of the power grid can be improved, the control method is simple, the circuit structure is clear, the operation is flexible, the response is rapid, and the application value is good.

The invention provides an energy-feedback type traction power supply device with low harmonic waves and high output power and a control method of the energy-feedback type traction power supply device. The power supply device comprises a phase-shifting transformer, a PWM rectifier unit and a control unit. A primary side three-phase winding of the phase-shifting transformer is in star connection. Two secondary side three-phase windings of the phase-shifting transformer are respectively in delta connection and in star connection. The primary side three-phase winding of the phase-shifting transformer is used for being connected with an AC power supply. The two secondary side three-phase windings of the phase-shifting transformer are connected with an AC side of the PWM rectifier unit. The control unit is connected with the PWM rectifier unit. The control unit controls the PWM rectifier unit through a fixed amplitude vector in an SHEPWM mode. Through the energy-feedback type traction power supply device with the low harmonic waves and the high output power and the control method of the energy-feedback type traction power supply device, active power outputted by the PWM rectifier unit can be improved, and current harmonics can be reduced.

The invention discloses a copper tube and an electric furnace energy-saving noninductive short net, wherein the copper tube comprises a first conductor and a second conductor axially sleeved on the periphery of the first conductor; a first insulation layer is filled between the first conductor and the second conductor; and the electric furnace energy-saving noninductive short net comprises a plurality of parallel conductive pipe fittings, each conductive pipe fitting comprises the first conductor and the second conductor axially sleeved on the periphery of the first conductor; and the first insulation layer is filled between each first conductor and the corresponding second conductor. By means of the electric furnace energy-saving noninductive short net provided by the invention, the defects of high inductive reactance, high impedance, low natural power factor, high unit power consumption and the like in the prior art are overcome, and the advantages of low inductive reactance, low impedance, high natural power factor and low unit power consumption are realized.

The invention designs a medium-voltage series capacitor compensating device and a transformer containing same. Medium-voltage series capacitor compensation is achieved by connecting in series a capacitor bank with the ternary-side loop circuit of an electric furnace transformer and belongs to a kind of longitudinal capacitance compensation. The medium-voltage series capacitor compensating device comprises a voltage-regulating winding of a main transformer, a series transformer, a bidirectional change-over switch, and a capacitor element. The high-voltage winding of the series transformer is connected in series with the ternary-side loop circuit of the main transformer. The low-voltage winding of the series transformer is connected with the secondary winding of the main transformer. One end of the high-voltage winding is connected with one end of the bidirectional change-over switch. The other end of the high-voltage winding is connected with one end of the capacitor element. The other end of the capacitor element is connected with a sliding contact of the main transformer voltage-regulating winding. The other end of the bidirectional change-over switch comprises two contacts which are disposed on a positive fixing terminal and a negative fixing terminal of the voltage-regulating winding of the main transformer, respectively.

The embodiment of the invention provides a method and device for recognizing variable pitch abnormities of a wind generating set. The method comprises the steps that a variable pitch speed signal of the wind generating set is obtained; and whether the variable pitch abnormities occur or not is determined according to the variable pitch speed signal, wherein the variable pitch abnormities comprise the variable pitch speed pinion abnormity or the variable pitch speed peak abnormity. When the wind generating set is in a variable pitch abnormity state before a variable pitch failure occurs, the variable pitch abnormity state, especially the variable pitch speed pinion abnormity or the variable pitch speed peak abnormity, can be quickly recognized, then the variable pitch abnormity state can be handled in time, key components like a variable pitch motor are effectively prevented from being damaged, and the active power output by the wind generating unit is effectively improved.

The invention discloses a preparation method and device for artificial crystal synthetic mica. The method and device provided by the invention provide reliable guarantee for obtaining high-quality synthetic mica. In addition to being used as synthetic mica, each component in the raw material for preparing synthetic mica provided by the invention also has the function of removing impurities in the raw material, which lays a good foundation for forming synthetic mica and obtains high-quality synthetic mica.

The embodiment of the invention discloses a motor control device and method. The motor control device comprises a driving circuit for obtaining a three-phase output voltage according to an input voltage command and a stator angle to drive a motor; and an adjusting circuit for obtaining an advance angle according to a phase current signal flowing through the motor and a back EMF angle, and adjusting a stator angle according to the advance angle so that the phase current signal and the back EMF signal can automatically achieve in-phase change, thereby achieving the advance angle control in a wide working range.

The invention discloses a photovoltaic power generation split-phase control method for a power supply system, and the method comprises the steps: collecting three-phase voltage and three-phase currentinstantaneous values of a photovoltaic inverter, and obtaining the active power and reactive power of the photovoltaic inverter through phase voltage and phase current injection into a traction sidethrough calculation; determining an output strategy of the photovoltaic inverter based on the voltage and current relationship between the traction side and a photovoltaic low-voltage side and the locomotive load state of the traction side, and generating a three-phase current per unit value injected into the traction side; and based on the output strategy and the three-phase current per unit value injected into the traction side, controlling the output current of each phase current of the photovoltaic inverter to track the three-phase current per unit value so as to complete power supply to atraction side load. According to the method, the intuition, rapidity and stability of a traction side photovoltaic inverter system are improved. The invention further discloses a photovoltaic traction power supply system, the three-phase photovoltaic power generation system can be directly connected into a three-phase power system, and unbalanced current, reactive circulation and oscillation power, caused by a single-phase transformer, of the three-phase system are avoided.

The invention discloses a dynamic tuning method for transmitting terminal frequency tracking of wireless electric energy transmission equipment. According to the invention, the resonant frequency of a transmitting terminal circuit is tracked dynamically by using a principle that the ratio between a current effective value of a transmitting coil and a transmitting terminal DC-side power supply current effective value is the minimum during resonance of the transmitting terminal circuit, that is, the ratio between the current effective value of the transmitting coil and the transmitting terminal DC-side power supply current effective value is tracked through continuously tuning the operating frequency of an inverter, and the current ratio is enabled to dynamically stay at the minimum value in real time, so that dynamic tuning for frequency tracking is realized, and the transmitting terminal circuit is enabled to stay at or approach to a state of complete resonance, thereby improving the transmission power and the transmission efficiency of the wireless electric energy transmission equipment. In addition, the circuit of the dynamic tuning method is low in complexity degree, and the implementation cost is low, thereby being easy to popularize.

The invention provides a comprehensive frequency modulation control method for a wind power plant. The method comprises: according to the rotating speed-power curve of the fan at different wind speeds, setting object function thereof, obtaining the maximum value of the target function; determining rotating speed limit values of the fan at different wind speeds; forming rotation speed limiting intervals of different wind speeds, merging the rotation speed limiting intervals into comprehensive frequency modulation control, performing reciprocal operation of weighted average on the wind speed, frequency difference and frequency change rate of a fan to obtain frequency modulation action delay of each fan, and staggering frequency modulation action time of each fan in a wind power plant throughmatching of a time sequence of the frequency modulation action delay of the fan. According to the comprehensive frequency modulation control method, the wind speed difference and relative independence of each fan are considered, each fan is matched according to the time sequence, the frequency modulation action time of each fan of the large-scale wind power plant is staggered, the time sequence matching among the fans of the wind power plant is realized, and greater transient disturbance caused by simultaneous action is avoided.

The related motor saving-energy control device for . 14kV-series walking-beam-type pumping unit comprises a TSC that uses a thyristor capacitor to automatic fast switch compensation on the motor outlet with motor reactive current Iq as signal. This invention reduces loss greatly, and achieves purpose for saving both reactive and active power.

The invention provides a microgrid power quality treatment method and device, and the method comprises the steps: considering the power quality treatment benefit, setting an objective function as theminimum microgrid operation cost, and building an economical active optimization model as an upper optimization model; considering that the objective function is the minimum node voltage deviation andthe minimum node harmonic voltage distortion rate of the microgrid, and taking the power quality management optimization model for managing the node voltage deviation and the harmonic distortion rateas a lower-layer optimization model; and calculating and reasonably distributing the capacity of the grid-connected inverter by utilizing the upper-layer optimization model and the lower-layer optimization model, so that grid connection of the grid-connected inverter according to power requirements is realized, and meanwhile, electric energy pollution of grid-connected nodes can be effectively treated by utilizing the residual capacity of the grid-connected inverter.

The invention discloses a control method of a converter with multiple modules directly connected in parallel. The control method comprises the steps: determining the product of the number of convertermodules connected to an alternating current winding of a transformer in parallel and the current phase number of a single converter module; determining the quotient of 360 degrees and the product asa target angle; and staggering carrier waves loaded on the converter modules to make the phases of the carrier waves sequentially differ by the target angle. According to the control method of the converter with the multiple modules directly connected in parallel, high-frequency harmonics near the switching frequency can be reduced in the converter with the multiple modules directly connected in parallel, and active power output by the system is greatly improved. The invention further provides a control system of the converter with the multiple modules directly connected in parallel and a computer readable storage medium; and corresponding technical effects are achieved.

The invention relates to dual alternating current chopper speed regulation of a wound-rotor asynchronous motor, which belongs to the technical field of electrical engineering. Rotor resistance speed regulation has the disadvantages of large energy loss and difficulty in realization of stepless speed regulation. A speed regulating scheme containing an inverter link has the disadvantages of complex system, low power factor and narrow speed regulating range, and is not suitable for low-power motors. A scheme that a main rotor loop contains a direct current chopper link has the disadvantages of large current capacity and poor reliability of a self turn-off element which is used. Aiming at the problems, the invention provides a new technical scheme, i.e. a dual alternating current chopper is used for chopping slip voltage, so as to change an equivalent value of the slip voltage to realize the stepless speed regulation and achieve the effects of more significant energy saving effect, higher power factor, better starting performance and mechanical properties, wider speed regulating range, small current capacity of the self turn-off element and simple and reliable system. The scheme can be used for large speed ratio stepless speed regulation of the wound-rotor asynchronous motor in various sizes and is especially suitable for the situation that impact load often occurs.

The invention discloses a mobile phone screen luminance control device. The mobile phone screen luminance control device comprises a light source module, a rectification treatment module, a silicon controlled dimmer and a first constant current controller processing module, wherein the light source module is used for providing a light source for a mobile phone screen; the rectification treatment module is connected with the light source module and is used for carrying out rectification on the input power supply; the silicon controlled dimmer is connected with the rectification treatment module and is used for adjusting the luminance of the light source; the first constant current controller processing module is connected with the rectification treatment module and the light source module, is used for providing anode forward current needed for maintaining the conduction of the silicon controlled dimmer, and enables the silicon controlled dimmer to be rapidly started during the next period of starting, so that the problem that the mobile phone screen has the twinkling phenomenon under the on-off switching state is solved, in addition, since the silicon controlled dimmer is rapidly conducted, the active power of a circuit is improved, namely, the circuit has a high-power factor value, the adjustment is easy, moreover, the circuit is simple in structure, and the needed cost is low.

The intelligent miniature circuit breaker comprises a circuit breaker body, an energy storage switch is installed on the upper left portion of the circuit breaker body, one side of the energy storage switch is connected with a motor, a wire inlet hole is formed in the outer surface of the circuit breaker body, and a remote control assembly is arranged on the lower surface of the wire inlet hole. One side of the remote control assembly is provided with a groove, the outer surface of the other side of the groove is provided with an alarm detection assembly, the other side of the alarm detection assembly is provided with an insulation protection assembly, and one side of the outer surface of the insulation protection assembly is provided with an opening electromagnet. According to the intelligent miniature circuit breaker, through the arrangement of the wired communication interface, the control chip, the synchronous signal chip and the voltage acquisition unit, remote control can be effectively realized, current can be switched on and off in time, and electrical and parameters can be remotely acquired, so that the optimal remote control effect is achieved.

The invention provides a distributed photovoltaic voltage out-of-limit treatment method for active and reactive power proportion optimization. The method comprises the following steps: when detecting that the voltage of a grid-connected point is out of limit, giving up a working mode of maximum power tracking when the voltage is out of limit, and executing the following steps: calculating reactive and active power proportionality coefficients which should be injected into the grid-connected point by a photovoltaic power generation system after the voltage of the grid-connected point is out of limit; the reactive power and active power proportionality coefficient enables the active power injected into the power distribution network bus by the photovoltaic power generation system to be maximum under the condition that the grid-connected point voltage is not out of limit; calculating an active power instruction and a reactive power instruction by using reactive and active power proportionality coefficients; based on the active power instruction and the reactive power instruction, obtaining a current reference value on a dq axis in a dq coordinate system subjected to constant-amplitude coordinate transformation; and adjusting the active power and reactive power of the photovoltaic injection grid-connected point based on the current reference value on the dq coordinate axis so as to adjust the voltage of the grid-connected point. Under the condition that the voltage of the grid-connected point does not exceed the limit, the active power flowing to the grid-connected point can be ensured to be maximum.

The invention discloses a wind turbine generator set fault recovery control method. The method comprises the steps that after a wind turbine generator set has a fault, a signal of a fault recovery command is checked; and after the fault recovery command is received, a torque given value is increased according to a preset torque change rate till relevant parameters of the set are recovered to be within a preset range, wherein the relevant parameters are active power, torque and speed specifically. According to the scheme, by increasing the torque to suppress speed rise when the wind turbine generator set has a fault, the phenomenon of "false recovery" can be avoided, the active power, speed and torque are raised in a matching mode, and eventually all the parameters are stably and rapidly recovered to a normal state. The invention furthermore discloses wind turbine generator set fault recovery control equipment and a computer readable storage medium. The control equipment and the computer readable storage medium also have the above advantages and therefore are not repeated herein.

The invention discloses an electromagnetic actuator for a ship. The electromagnetic actuator comprises a ring-shaped magnetic steel supporting body and a ring-shaped magnetizer, wherein the section of the magnetizer is U-shaped; one end of the magnetizer is connected with the magnetic steel supporting body; a coil framework and magnetic steel are sequentially arranged between the other end of the magnetizer and the magnetic steel supporting body; a coil is winded around the coil framework; a clearance is formed between the coil and the magnetic steel; the coil framework is connected with a force transfer frame; first spring sheets and second spring sheets are respectively arranged on the two sides of the force transfer frame; the first spring sheets are connected with the magnetizer; the second spring sheets are connected with the magnetic steel supporting body; a first baffle is arranged outside the magnetic steel supporting body; a second baffle is arranged outside the magnetizer; a first air vent is arranged on the magnetizer; and a second air vent is arranged on the magnetic steel supporting body. The electromagnetic actuator provided by the invention is good in heat dissipating effect, high in electromagnetic force coefficient and large in activation force.