33results about How to "Guaranteed voltage stability" patented technology

A novel power unit of a cascade unit comprises a DC voltage driver unit, a voltage lifting chopping part and an inverting part. The DC voltage drive of the power unit adopts a three-phase bridge type uncontrolled rectifier system, and two controllable IGBTs and two fast diodes are added at the DC side, thus forming a DC voltage lifting chopping circuit which can control the voltage at the DC link and broaden the scope of AC output voltage amplitude; an inverter adopts IGBT single-phase full bridge controllable output, and a fault bypass circuit is added at the output terminal of the inverter; and a rectifier transformer is of common wiring multi-winding type, and all secondary windings have the same wiring mode. A voltage lifting half-bridge and a neutral point in a filter capacitor set are connected with the neutral point in a harmonic current circuit to provide a channel for injecting zero sequence current so as to achieve the sinusoid of high power factor rectification and the input current.

The invention relates to a feedback driving circuit. The circuit includes a channel LED current driving circuit module (003) used for receiving matching current of at least two LED channels according to received digital signals, at least two sampling and holding circuit modules (001) used for acquiring and holding node voltage at one end of each of the least two LED channels respectively, a channel feedback voltage selection and error amplifier module (002) used for determining minimum voltage from voltage outputted from the sampling and holding circuit modules (001) and amplifying the minimum voltage and then outputting the amplified minimum voltage, and a voltage boosting driving-stage circuit module (006) used for performing adaptive adjustment on node voltage at the other ends of the least two LED channels according to the output voltage of the channel feedback voltage selection and error amplifier module (002). With the feedback driving circuit of the invention adopted, an external voltage splitting feedback resistor can be omitted under the condition that the area of a chip is not increased, and the voltage stability of an external circuit is maintained, and the output voltage of the external circuit is optimal, and the utilization efficiency of a power source is improved.

The invention discloses a multisource system partitioning method considering voltage stabilization. The method includes: selecting time sections form researched time; increasing load of each node according to a system total load value of a first time section; subjecting various power sources to output increase and distribution; obtaining a system quiescent voltage stabilization critical point; performing modal analysis to obtain a node, weakest in voltage stabilization, of the time section; traversing all time sections, and taking the weak node highest in frequency of occurrence as a full-time-scale weak node; collecting time sections with solution results corresponding to the full-time-scale weak node, respectively obtaining weak areas of the time sections according to reactive voltage sensitivity relationship, and getting intersection of the obtained weak areas to form weak areas under a full time frame. The multisource system partitioning method considering voltage stabilization has the advantages that various power supply output features and load fluctuation are considered comprehensively, and voltage stability of a power system with various power sources can be improved beneficially.

The invention discloses a distributed wind turbine generator system reactive power optimization strategy. The strategy includes original data inputting, simplex method initiation, load flow calculation, object function fitness value calculation, extreme updating, determining whether variation conditions have been met, variation operation, and determining whether the calculation has met terminating conditions. The method is based on particle swarm optimization algorithm, and proposes an improved particle swarm algorithm which changes the initiation method of particle swarm, introduces variation factors to iterative, and modifies the iterative formula and parameters of the fundamental particle swarm algorithm. According to the invention, the sum of transmission losses and average voltage irrelevance serves as a reactive optimization model of the object function, the reactive power limit of a double fed asynchronous wind power generator (DFIG) serves as constraining condition, and the improved particle swarm algorithm is utilized to resolve distributed wind farm reactive requirements and reactive distribution of each wind turbine generator system. Compared with convention control methods, the strategy is advantaged by cost and engineering practicality, and flexible and rapid control.

The invention discloses a low-power-consumption stable voltage backlight control circuit. The low-power-consumption stable voltage backlight control circuit comprises a front-end power supply circuit, a DC-DC (Direct Current-Direct Current) voltage adjusting circuit, a rear end linear constant current circuit and a voltage detection circuit, wherein the front-end power supply circuit comprises a power supply circuit, a first power supply output end, a second power supply output end and a feedback circuit; the feedback circuit is used for controlling the power supply circuit to adjust voltage values of the first power supply output end and the second power supply output end according to a voltage value of a control signal input end; the DC-DC voltage adjusting circuit is used for adjusting a voltage signal output by the second power supply output end to a fixed voltage signal; the voltage detection circuit is used for switching off current passing through an LED lamp cluster when the LED lamp cluster is closed. The invention further provides a self-adapted power supply adjustable television. According to the technical scheme disclosed by the invention, the output voltage is controlled according to the voltage change of the LED lamp cluster, supply voltage of a main board is stabilized and a phenomenon that an LED has micro-light when backlight is closed is prevented.

The invention discloses a method for quickly determining the voltage stability of a large-scale distributed photovoltaic access power distribution network, and the method comprises the steps: expressing the correlation between a voltage change and a node reactive power change through a network power flow equation, and expressing the correlation between a node reactive power adjustment amount and ameasurement point voltage through a piecewise linear function equation; integrating the two equations based on a function transformation rule to describe a relationship between a network state and avoltage measurement result of any node. In order to describe a state equation of network voltage change, the voltage stability problem of the power distribution network is further expressed as a process of describing reactive power output of two adjacent iterations, and the voltage stability problem of the power distribution network is converted into a change process of reactive power of an inverter and is subjected to differential solution; the technical problems that in the prior art, for grid connection of large-scale cluster distributed photovoltaics, all nodes or most nodes in a network are connected to a photovoltaic power supply, the calculated amount and the calculation difficulty of a traditional voltage stability calculation method are sharply increased, and parameter setting lacks flexibility are solved.

The invention relates to the technical field of ultrasonic fingerprint identification, and comprises a fingerprint touch control identification module and a fingerprint touch control identification method; the fingerprint touch control identification module can start a corresponding fingerprint touch control identification area based on a finger touch position to carry out fingerprint detection and obtain data after the finger touch position is detected, thus further processing based on the obtained data to obtain a corresponding fingerprint image. On the basis of the plurality of fingerprint touch control identification areas which are arranged in a partitioned manner, large-area fingerprint identification signals can be realized without additionally configuring other detection modules, and the capacitance value accessed into a circuit each time can be in a resonance range, so that the voltage stability in fingerprint identification is ensured, and the emission efficiency is improved. The invention further provides electronic equipment which can meet the requirements of miniaturization and large-area ultrasonic fingerprint identification.

The invention provides a rare earth permanent-magnet DC generator. The rare earth permanent-magnet DC generator comprises a power module, a rare earth permanent-magnet generator, a voltage stabilizingcircuit, a control module and a test module. The invention can solve the problems that the number of components and parts is increased, the weight of a permanent-magnet DC generator is increased, andthe whole machine operation voltage regulation reliability or transient characteristic is poor in an existing DC permanent-magnet generator set voltage regulation mode. Therefore, the direct-currentpermanent magnet generator set is higher in reliability and good in transient characteristic in the voltage regulating process, and has the automatic voltage regulating and stabilizing functions.

The invention provides a voltage-stabilizing anti-creeping silicon carbide diode. The voltage-stabilizing anti-creeping silicon carbide diode comprises cathode metal, a silicon carbide substrate, a silicon carbide epitaxial layer, anode metal and a SiO2 layer. A first lug boss and a second lug boss are formed on the silicon carbide substrate, a first groove is formed in the first lug boss, and a second groove is formed in the second lug boss; a first Schottky barrier is formed between the lower end of the first contact part and the silicon carbide epitaxial layer, a second Schottky barrier is formed at the junction of the second contact part and the first groove, and a third Schottky barrier is formed at the junction of the third contact part and the second groove; the distance between the first Schottky barrier and the silicon carbide epitaxial layer is a, the distance between the bottom of the second Schottky barrier and the silicon carbide epitaxial layer is b, the distance between the bottom of the third Schottky barrier and the silicon carbide epitaxial layer is c, and a > b = c. The silicon carbide diode provided by the invention has excellent voltage-stabilizing and anti-creeping characteristics.

The invention belongs to the field of intelligent power grids, and provides a staged voltage control method and system for an alternating current and direct current system under high wind power permeability. In an emergency control stage, the voltage control variable of an area in the next step is determined through prediction and inter-area communication; and voltage control is carried out through model predictive control with minimum voltage deviation and control cost as objective functions. In a preventive voltage control stage, reactive replacement is performed on quick response equipment by using a generator set and a parallel capacitor in the area, so that the standby margin of the quick response equipment is increased, and the ability of the system to deal with sudden accidents is improved. A simulation result shows that the strategy can improve the calculation efficiency of long-term voltage control and optimize the reactive standby of the system.

The invention provides a barrier removing robot. According to the robot, STM32F103VET6 serves as the control core assisted by a TB6612FNG motor driving module, intelligent traveling of the device is realized, the robot is remotely and manually controlled through the radio frequency technology, and the travel distance or barrier removing route of the robot is operated. The robot is provided with an encoder device, the encoder device and a motor driving circuit form closed-loop control, and traveling of the robot can be effectively controlled. The robot is provided with a sound-light alarm module, and a sound-light alarm can be triggered when a fault appears. Besides, an overall power supply circuit is optimized in a centralized mode, a voltage stabilizing circuit is designed for the purpose of improving voltage stability in combination with electrical demands of all working modules, and therefore operating stability of the robot is guaranteed. In respect of software, C language programming is adopted, hardware design and software design are combined, and remote control, automatic correction, automatic barrier removal and other functions can be achieved. The whole system is ingenious in design, reasonable in algorithm and accurate in control, and the intelligent barrier removing function can be well achieved.

The invention relates to the technical field of circulating charging equipment, and discloses a circulating charging system which comprises a box body, an external mechanism is fixedly connected to the front face of the box body, a circulating charging mechanism is fixedly connected to the inner bottom of the box body, the circulating charging mechanism comprises a motor, and the motor is fixedly connected to the left side of the inner bottom of the box body. A generator is fixedly connected to the right side of the motor, a box body is fixedly connected to the bottom of the generator, a voltage stabilizer is fixedly connected to the right side of the bottom in the box body, and a partition plate is fixedly connected to the top of the voltage stabilizer in the box body. According to the circulating charging system, the receiving port can transmit external electric power to the motor, so that the motor can generate electricity conveniently, the control panel can monitor the condition of the generator and the charging condition in real time, and meanwhile, the starting button and the closing button can be started and closed anytime and anywhere; and the output port and the charging panel are arranged, so that various different devices can be conveniently charged in the later period, and the charging efficiency is high.

The invention relates to the field of automotive electronics, and discloses vehicle-mounted equipment and a power supply pulse suppression circuit thereof. The power supply pulse suppression circuit comprises a bidirectional transient voltage suppression diode which is electrically connected between a positive electrode of an external voltage input and the ground and is used for bypassing a high-voltage pulse of which the voltage is greater than a breakdown voltage of the bidirectional transient voltage suppression diode to the ground; a pi type filter circuit is electrically connected to therear end of the bidirectional transient voltage suppression diode and is used for filtering the input voltage after high-voltage pulse suppression; and the voltage input end of a voltage stabilizing circuit is electrically connected to the rear end of the type filter circuit and is used for converting the input voltage into the output voltage with a preset voltage value.

The invention discloses an unmanned aerial vehicle battery management system capable of improving the comprehensive utilization rate, which comprises a battery electric quantity calculation module, an unmanned aerial vehicle power calculation module, a control processing module and a transmission receiving module, and is characterized in that the battery electric quantity calculation module comprises a battery voltage stabilization transmission module, a battery voltage and current measurement and calculation module and a residual electric quantity estimation module; the unmanned aerial vehicle power calculation module comprises an unmanned aerial vehicle working condition analysis module and an operation power real-time measuring module; the system is scientific and reasonable in structure and safe and convenient to use, fluctuation of output voltage and output current of the batteries can be reduced, and the voltage stability and the current stability when the parallel batteries output electric quantity are kept. And the residual electric quantity of the battery of each unmanned aerial vehicle can be analyzed and calculated, the comprehensive utilization rate of the electric quantity of the unmanned aerial vehicle is improved, the operation condition of electric appliance elements for power supply can be monitored in real time, and a user can conveniently control the unmanned aerial vehicle according to the real-time power of the unmanned aerial vehicle and the predicted endurance time and endurance mileage.

The present invention discloses a voltage-reactive power relevantly varied reactive power compensation demand acquisition method. The method comprises the following steps: step 1 based on the electrical parameter relation of a node in a system network structure, acquiring the relation of the node voltage change ratio of a load side, the active power and the change ratio thereof consumed in the load side, and the active power change ratio transmitted from a system side to the load side when the disturbance occurs, and acquiring a reactive power compensation demand rule at the node according tothe relation; and step 2 acquiring the load node voltage change ratio of the node to be analyzed, the reactive power change ratio consumed by the load, the reactive power change ratio transmitted fromthe system side to the load side under the time to be analyzed, and determining the reactive power demand of the node to be analyzed under the time to be analyzed based on the reactive power compensation demand rule of the step 1. The method can acquire the reactive power demand(s) of all the node(s) quickly and precisely.

The invention discloses an uninterruptible power supply with adjustable output voltage, which comprises a main power line, a bypass power line and a maintenance bypass power line, the main power line, the bypass power line and the maintenance bypass power line are connected in parallel, the main power line is connected with a main switch in series, the bypass power line is connected with a bypass switch in series, and the maintenance bypass power line is connected with the bypass switch in series. A maintenance bypass switch is connected to the maintenance bypass power line in series, one end of the main path power line is connected with a power input end, the power input end is electrically connected with an external input power supply, and a rectifier, a direct current bus, an inverter, a filter and an isolation transformer are arranged on the main path power line. Aiming at the condition that standard voltages of equipment in different countries in an industrial place are different, the related uninterruptible power supply can carry out conversion of output voltage grades and output voltage frequencies of different national standards according to user requirements, and meanwhile, the modulation ratio of SPWM control is prevented from being reduced, and the quality of the output power supply is prevented from being reduced.