41results about How to "Stable voltage" patented technology

The invention discloses a harmonic suppression and dynamic reactive compensation control method for an energy router, which is suitable for a micro-grid and a distributed energy access system. According to the method, three-phase current and voltage signals of an alternating current port of the energy router are collected, five-time and seven-time main harmonic components are extracted through fast Fourier transform, harmonic compensation current instructions equal in amplitude and opposite in phase are generated and injected into an inverter to be output, and active counteracting of main harmonics is achieved. Meanwhile, the bus voltage deviation and the change rate thereof are detected, a reactive current instruction is adjusted on line by adopting a fuzzy self-adaptive PI controller, rapid and smooth dynamic reactive compensation is realized, and the bus voltage is stabilized. Decoupling control of active / reactive and harmonic components is realized in combination with Park conversion, and virtual impedance is introduced to enhance system damping and harmonic suppression capabilities. Compared with the prior art, harmonic suppression and voltage support can be simultaneously realized under a single control framework, the response speed is high, the stability is high, and the method is suitable for high-performance grid-connected operation of the multi-port energy router.

The invention discloses a multi-standard power supply system and method for a locomotive test, and relates to the technical field of test power supplies, and the structural design of the system is as follows: an input power supply is a three-phase alternating current 10kV power supply; the high-voltage switch K realizes access control and isolation of the system and a public power grid, the connection reactor L realizes energy buffering and inhibits switch ripples in output current, and the soft charging circuit pre-charges the three-stage converter. The three-level converter converts three-phase alternating current 10kV into DC1500 / 750V and outputs the DC1500 / 750V to the direct-current bus, one path of the direct-current bus supplies power to a subway vehicle test line, and the other path of the direct-current bus is inverted into single-phase alternating current 25kV through the output inverter and supplies power to a railway locomotive test line. According to the invention, alternating current test conditions of railway electric traction locomotive vehicles and direct current test conditions of subway vehicles can be satisfied, reliability and quality of power supply are ensured, repeated construction is reduced, and resource waste is avoided.

The application provides a multifunctional static synchronous compensator system, comprising: a plurality of three-phase converter valves, input ends of each three-phase converter valve being connected to a common DC bus; an energy storage valve, being connected in parallel with the three-phase converter valve, and the plurality of three-phase converter valves sharing the energy storage valve through the common DC bus; a switch breaker device, being arranged between the three-phase converter valve and the energy storage valve; and a control unit, being connected with the plurality of three-phase converter valves, the energy storage valve and the switch breaker device respectively. The application also provides a method for operating the multifunctional static synchronous compensator system. The multifunctional static synchronous compensator system provided by the application adopts back-to-back converter valves, shares energy storage elements through a common DC bus, and connects two AC buses to the two sides of the converter valve, so that the system can support the two AC power grids, greatly save the installation capacity of the energy storage elements in the energy storage valve, and provide power interconnection between the two AC power grids and play a role in tidal flow control.

The application relates to a power plant auxiliary power interconnection electrical device, which comprises a first generator and a first generator corresponding first machine end bus, the first generator is connected to a power grid bus through a first main transformer, a second generator and a second generator corresponding second machine end bus, the second generator is connected to the power grid bus through a second main transformer, an auxiliary power interconnection bus, the auxiliary power interconnection bus is connected with the first machine end bus through a first series reactor and connected with the second machine end bus through a second series reactor, and the auxiliary power interconnection bus is further connected with a transient voltage stability system, and the transient voltage stability system is used for providing reactive power support and voltage stability. Through the application, the problem that the steady state and transient stability of the auxiliary power system cannot be guaranteed is solved, the transient voltage stability system can provide real-time reactive power support and maintain the voltage stability of the auxiliary power system.

An anti-fuse memory cell, an anti-fuse memory array and a memory, the anti-fuse memory cell comprising: an anti-fuse structure having a first end and a second end; the selection transistor comprises a drain electrode and a source electrode, and one of the drain electrode and the source electrode is coupled with the first end of the anti-fuse structure; and the anode of the voltage stabilizing diode is coupled with the other one of the drain electrode and the source electrode. According to the embodiment of the invention, the voltage stabilizing diode is additionally arranged in the anti-fuse memory cell and is connected with the selection transistor in series, the voltage stabilizing diode can provide stable voltage for the selection transistor, interference caused by current fluctuation can be resisted, correspondingly, the selection transistor can provide stable current for the anti-fuse structure, and the anti-fuse memory cell is more stable in performance. Therefore, the programming reliability of the anti-fuse structure is improved.

The invention relates to the technical field of aircraft power generation, and discloses a power generation system of an unlimited continuous underwater aircraft, which comprises a main body frame, a wave energy capturing unit, a solar power generation unit, a transmission and power generation unit and a control and energy storage unit, the main body frame adopts a corrosion-resistant steel structure, a latticed photovoltaic mounting area is arranged at the top of the main body frame, and reinforcing ribs and connecting seats connected with the rotary wings are arranged below the main body frame; the wave energy capturing unit comprises rotary wing modules symmetrically arranged on the two sides of the main body frame. A wave energy capturing unit and a solar power generation unit are compositely integrated, an impeller type capturing piece and a permanent magnet synchronous generator are driven by reciprocating swing of rotary wings on the two sides to operate cooperatively, and meanwhile flexible solar cell modules are arranged on the top of a main body frame and the surfaces of the two wings. Parallel collection and complementary power supply of wave energy and solar energy on the same carrier are realized, and all-weather and multi-mode energy capture and continuous power supply of an underwater vehicle in a complex marine environment are realized.

The application provides a DC energy storage system anti-sampling drift current sharing control method and system, comprising the following steps: S1: based on a DC network type energy storage system containing multiple energy storage converters, an equivalent circuit model of the multiple parallel energy storage converters is constructed; S2: based on an active voltage disturbance method, load impedance of the DC network type energy storage system is estimated according to the equivalent circuit model of the multiple parallel energy storage converters; S3: each energy storage converter respectively calculates a current reference value of DC network type energy storage system current sharing according to a local estimated value of the load impedance, and respectively calculates a line voltage drop value that needs to be compensated based on the current reference value; and S4: based on the calculated line voltage drop value that needs to be compensated, the influence of the line impedance on the DC bus voltage is offset.

The utility model relates to the technical field of water pump drivers, in particular to a solar water pump driver capable of working at wide voltage, which is characterized by comprising a single chip microcomputer, a motor driving module and a DCDC power supply module, the DCDC power supply module is used for connecting a solar panel and receiving a wide voltage source VB +, the single chip microcomputer is connected with the motor driving module, and the motor driving module is connected with the motor driving module. The motor driving module is used for being connected with a water pump motor, a PWM pin of the single-chip microcomputer is connected with the voltage regulating circuit, the voltage regulating circuit obtains a wide voltage source VB + and provides a working voltage source VBUS, the working voltage source VBUS is provided for the motor driving module, and the single-chip microcomputer is further connected with the voltage sampling circuit. The two voltage sampling circuits are respectively connected with the voltage regulation circuit to respectively sample a wide voltage source VB + and a working voltage source VBUS. According to the utility model, the input and output voltages in the voltage regulation process are sampled in real time, and the voltage regulation circuit is utilized to regulate and configure the wide-range voltage of the solar panel, so that the beneficial effect of improving the working safety and reliability of a hardware circuit is achieved.

The invention discloses a parameter-adaptive excitation PID (Proportion Integration Differentiation) control method, system and equipment and a readable storage medium, and the method comprises two control links: one control link is a main control link, namely, when the terminal voltage of a synchronous motor is changed, a variable parameter compensation link is set before conventional series / parallel PID control, and a variable parameter compensation link is set before conventional series / parallel PID control; according to the compensation link, the series / parallel PID parameters can be dynamically compensated according to the working points of the synchronous motor, parameter self-adaption and optimal control are achieved, and the reactive response speeds of the synchronous motor at all the working points can tend to be consistent under the condition that the zero pole of the system is not changed; and the second step is a parameter limiting link, that is, when the deviation is smaller than a deviation given value, PID parameters are attenuated in time, so that the terminal voltage of the synchronous motor is fast and stable, and the running stability of the synchronous motor can be ensured while the dynamic reactive response speed is effectively improved.

The invention discloses an intelligent electromagnetic balance energy-saving system, and relates to the technical field of intelligent power grids. According to the system, power grid operation data are collected and preprocessed into per unit values, equivalent reactance and the total reactive power vacancy of the system are calculated according to the per unit values, then the rated capacity of a reactive compensation device is combined, the reactive power vacancy of an inverter is calculated, inverter operation data and current collection line parameters are obtained, and first reactive power and second reactive power are obtained through preset operation; and finally, the bus voltage and the system power factor of the transformer after control are collected again, and an adjusting instruction is judged and generated according to the bus voltage and the system power factor. Reactive power compensation of the inverter is realized, output of the inverter is controlled to be optimal, influence of electromagnetism on a power grid is reduced, stability of voltage and power factors of the power grid is ensured, a control strategy can be automatically adjusted according to closed-loop design, and stability of the power grid and operation efficiency of the inverter are improved.

The application discloses a bipolar high-gain Cuk DC-DC converter for a direct-current microgrid, and relates to the field of voltage converters.The bipolar high-gain Cuk DC-DC converter comprises a coupled input unit, a bipolar voltage boosting unit and an output unit which are adaptively connected.The coupled input unit comprises a switching tube S and a coupled inductor.The same name end of the primary winding L1 of the coupled inductor is connected with the first electrode of the switching tube S, the third electrode of the switching tube S forms the positive input end of the coupled input unit, and the non-same name end of the primary winding L1 of the coupled inductor forms the negative input end of the coupled input unit.The first electrode of the switching tube S is connected with the neutral point of the output unit through the bipolar voltage boosting unit, the negative input end of the coupled input unit is connected with the negative output end of the output unit through the bipolar voltage boosting unit, and the output voltage amplitude of the positive output end and the negative output end of the output unit relative to the neutral point is equal.The converter has the advantages of high gain, self-voltage equalization, no need of an additional clamping circuit, high efficiency and strong reliability.

This invention relates to a method for improving the light-load efficiency of a synchronous rectifier chip. The method involves monitoring the voltage V between the output terminal K and the input terminal A of the synchronous rectifier chip. KA The V KA This reflects the change in load current; when the V KA When the voltage drops to the first preset voltage, based on V KA = -Is×Rdson is used to dynamically pre-adjust the Vgs drive voltage to counteract the Vgs voltage drop caused by the decrease in load current Is. KA The change extends the turn-on time of the synchronous rectifier chip; Rdson is the on-resistance of the MOSFET inside the synchronous rectifier chip; the dynamic pre-adjustment processing of the Vgs drive voltage includes: controlling the reduction of the Vgs drive voltage, utilizing the characteristic that Rdson increases as Vgs decreases in the MOSFET, and maintaining Vgs. KA The voltage remains constant.

This invention relates to the field of power grid control technology, specifically to a reactive power compensation method and apparatus based on photovoltaic inverters. The method includes: acquiring real-time operating data of the photovoltaic inverter and historical compensation data from key monitoring points of the power grid; determining whether voltage fluctuations have occurred in the power grid based on the grid voltage in the real-time operating data; when grid voltage fluctuations are detected and the grid voltage exceeds a preset voltage range, calculating the reactive power demand of the power grid based on the real-time operating data; and determining the current state of the photovoltaic inverter based on the active and reactive power in the real-time operating data, where the current state includes normal operation, fault status, or current limiting status. This invention, by monitoring the operating status of the photovoltaic inverter and the voltage fluctuations of the power grid in real time, can flexibly adjust the reactive power output of the inverter according to the actual reactive power demand of the power grid, ensuring voltage stability and avoiding the negative impacts of grid voltage fluctuations.

A rotating electrical machine control device shifts a control system to synchronous five-pulse control when an operating point crosses a second boundary K22 from a state in which asynchronous pulse-width modulation control is being executed, and shifts the control system to the asynchronous pulse-width modulation control when the operating point crosses a first boundary K21 from a state in which the synchronous five-pulse control is being executed. The first boundary K21 is set such that the number of switching pulses per unit rotational speed by the synchronous five-pulse control immediately before the operating point crosses the first boundary K21 is smaller than the number of the switching pulses per unit rotational speed by the asynchronous pulse-width modulation control immediately after the operating point crosses the first boundary K21.

The application discloses a band gap reference circuit and a working method thereof and electronic equipment, and relates to the technical field of band gap reference circuits.The circuit comprises a pre-stabilization module, a starting module electrically connected with the pre-stabilization module, a band gap core module electrically connected with the starting module, and an operational amplifier module electrically connected with the band gap core module and the pre-stabilization module; wherein, the band gap core module is used for outputting a reference voltage source; the pre-stabilization module is used for buffering a power supply voltage, obtaining a working voltage, and providing the working voltage for the starting module and the operational amplifier module, and the pre-stabilization module is also used for feeding back the influence of the fluctuation of the power supply voltage on the reference voltage source to the pre-stabilization module for readjustment; the starting module is used for starting the band gap core module; and the operational amplifier module is used for performing negative feedback adjustment on the reference voltage source.The circuit can provide a reference voltage source with high PSRR and low temperature drift.

The invention discloses a pixel circuit and a display panel, and belongs to the technical field of display. The pixel circuit comprises an amplitude modulation module, a pulse width modulation module, a coupling module and a potential control module. The second connecting end of the coupling module is connected with the control end of the pulse width modulation module; the potential control module is connected with the first connecting end of the coupling module, and is connected with a direct-current voltage and a display control signal; the potential control module is used for controlling the first connecting end to float in a pulse width data writing stage and a light emitting stage; the display control signal jumps into a second data voltage required by the pulse width modulation module in a pulse width data writing stage, and after jumps into an initial voltage of the ramp signal in a light emitting stage, the ramp signal with monotonically changed voltage is presented; and the potential control module is also used for transmitting the direct-current voltage to the first connecting end in other stages of displaying that the control signal has voltage change. According to the embodiment of the invention, the voltage of the control end of the pulse width modulation module can be stabilized, and the display image quality is improved.

This invention specifically relates to a distributed power management strategy for a hybrid electric propulsion system for electric aircraft, belonging to the field of aviation electrification. The system consists of a fuel cell, an energy storage battery, and a supercapacitor connected in parallel to a DC bus via a power converter. In this invention, each unit is independently controlled based on local information, eliminating the need for a communication network: the fuel cell adaptively switches between voltage and power modes according to the load power and battery state of charge, avoiding heavy or light load operation; the battery adjusts its steady-state operating point through a virtual resistance droop mechanism, absorbing steady-state power deficits or excess power; the supercapacitor absorbs dynamic power through a virtual capacitance droop mechanism, suppressing load fluctuations. This invention effectively suppresses the negative impacts of heavy / light loads, load fluctuations, and frequent start-stop cycles on fuel cell lifespan and efficiency, reduces hydrogen consumption, and improves overall system reliability.

The application discloses a method and device for adjusting charging current of a charging pile according to supply voltage and a charging pile, wherein the system voltage, i.e., the supply voltage, of an alternating current power grid connected with an alternating current charging pile of an electric vehicle is detected in real time; when the system voltage is in a normal supply voltage range, the charging pile of the electric vehicle controls the charging current according to real-time charging demand of the vehicle under the condition that the maximum output power of the charging pile is not exceeded; when the system voltage is lower than the normal supply voltage range, the alternating current charging pile of the electric vehicle interacts with the vehicle-mounted charger through communication to reduce the alternating current charging current of the electric vehicle until the system voltage returns to normal, so that the system voltage is stabilized and the serious low voltage of a rural power grid caused by unordered charging of a large number of electric vehicles is reduced.

The application provides a film printer power supply system, a control method, equipment and a medium. The system comprises a power supply, a power supply transfer plate, a print head, and a printer system. The input end of the power supply transfer plate is connected with the power supply. The print head is connected with the first output end of the power supply transfer plate. The communication end of the power supply transfer plate is connected with the printer system. The power supply transfer plate is used for stabilizing and compensating the print head when the logic signal sent by the printer system is acquired through the communication end, so that the print head voltage is stable, the printer can obtain more stable heating hardware support, the printing quality is improved, better printing imaging is obtained, and the power supply transfer plate can distribute power, so that the print head and other system parts no longer take power from the same power supply branch, thereby reducing the possibility of power interference, effectively solving the problem of power voltage jumping, preventing the print head voltage from being reduced too much during high-power work, and avoiding lightening of the printing color.

This invention discloses an energy coordination and neutral point balance control method applied to a bidirectional energy storage converter. Specifically, the difference between the voltage difference of the voltage divider capacitors and the standard deviation value (0) of the bipolar DC microgrid is subtracted, and this difference is used to generate a voltage equalization control signal after passing through a voltage regulator. This voltage equalization control signal is then subtracted from the neutral point current, and the result is used to generate an improved voltage equalization control signal through a current regulator. This improved voltage equalization control signal is added to the bus voltage control signal and transmitted to a PWM pulse signal generator to generate pulses that control the DC / DC converter. This invention employs a three-level bidirectional DC-DC energy storage converter method to suppress the neutral point voltage offset problem and proposes an improved current loop voltage equalization control loop. Compared with traditional voltage equalization control loops, the proposed voltage equalization strategy has a better effect on voltage imbalance problems.

The present application relates to the technical field of power system intelligent control, and more particularly to an active distribution network voltage control method fusing Mamba prediction and multi-agent, which is mainly aimed at the problems of lack of foresight and low inference efficiency of prediction model in existing multi-agent reinforcement learning, and proposes the following technical scheme: step one, dividing the region based on the topology structure of the active distribution network; step two, predicting the node voltage and power of the distribution network; step three, constructing an optimization target with the minimum node voltage disturbance deviation and the minimum control cost as the target, and reconstructing the active distribution network voltage control problem; step four, realizing the active distribution network voltage collaborative control.The present application gives the voltage control foresight by fusing Mamba efficient prediction and MATD3 multi-agent collaborative decision-making, reduces the computational complexity, relieves the dimension disaster, and improves the accuracy, real-time performance and economy of the distribution network voltage stability control.

The invention discloses a photovoltaic energy storage system switching control method based on islanding effect pre-judgment, which comprises the following steps of: 1, acquiring various parameters of a power grid in real time, establishing a power grid state database, and continuously monitoring various electrical parameters of the power grid by adopting a sensor; step 2, a machine learning algorithm is utilized, data in the power grid state database is taken as a training sample, an islanding effect pre-judgment model is constructed, and the islanding effect pre-judgment model is used for predicting the probability of power failure caused by faults of the power grid in a period of time in the future; 3, setting a pre-judgment probability threshold value, and when the prediction probability of the island effect pre-judgment model exceeds the threshold value, sending a grid-connected and off-grid switching signal; and step 4, after the switching signal is received, calculating the required energy storage output adjustment amount according to the current load demand and the output power of the photovoltaic cell. The charging and discharging states of the energy storage system are adjusted by controlling the energy storage converter, so that the sum of the photovoltaic power and the energy storage output can be matched with the load requirement.

The application relates to a voltage adjustment method and device of a detector, a detector system and a storage medium, wherein the voltage adjustment method of the detector comprises the following steps: acquiring an actual input voltage of a detector input end; adjusting a power supply voltage of the detector based on the actual input voltage and a preset voltage to obtain a target power supply voltage after adjustment; and transmitting the target power supply voltage to the input end of the detector. Through the application, the problem of low detector performance is solved, and the stability of the detector in the operation process is improved.

The invention discloses a fuel cell control strategy and a proton exchange membrane fuel cell system, and belongs to the field of fuel cells. Entering an oxygen consumption discharge stage, and adjusting the hydrogen inlet pressure of the anode side; the fuel cell is connected with a DC / DC converter, a first discharge current is set, and when the minimum voltage of the single electric pile is smaller than a first voltage threshold value, the DC / DC converter is cut off, and a proportional valve on the anode side is closed; entering a hydrogen consumption discharge stage, and adjusting the gas inlet pressure of the cathode side to enable the oxygen concentration to be between a first concentration threshold value and a second concentration threshold value; second discharge current is set, and when the minimum voltage of the galvanic pile monomer is smaller than a second voltage threshold value, the DC / DC converter is cut off, and the air compressor and the air inlet valve are closed; and opening a tail exhaust valve on the anode side, and introducing air. The staged operation of oxygen-consuming discharge and hydrogen-consuming discharge is carried out in sequence, the voltage of a single cell is reduced gently and is good in consistency, the corrosion of the surface of a cathode catalyst is relieved, and the service life of the fuel cell is prolonged.