640 results about "Voltage droop" patented technology

An apparatus and method for efficiently managing voltage droop among replicated compute circuits of an integrated circuit. In various implementations, an integrated circuit includes multiple, replicated compute circuits, each with the circuitry of multiple lanes of execution. Control circuitry of the integrated circuit identifies, early in execution pipelines, groups of instructions to be executed by a corresponding compute circuit, and generates a total power consumption estimate for the groups. The control circuitry maintains N previous total power consumption estimates, and stores the N power consumption estimates in staging circuitry referred to as an “instruction history pipeline.” If any differences between total power consumption estimates of different stages of the instruction history pipeline exceeds a corresponding threshold, then the control circuitry reduces, late in the execution pipeline, the rate of instruction execution of computation lanes of a corresponding compute circuit.

The invention belongs to the technical field of power system power distribution network relay protection, and provides an active fault property discrimination method based on injection disturbance current response characteristics, which comprises the following steps: step 1, when an inter-phase fault occurs in a system, three-phase tripping of a fault line outlet circuit breaker occurs, and according to three-phase current and voltage change conditions before and after the fault, determining whether the fault occurs or not; determining two phases with increased line current and reduced voltage as fault phases; 2, delaying for 200ms after the circuit breaker trips, and controlling the action of a split-phase switch; according to the method, disturbance current signals are injected through an external power supply, the disturbance signals have obvious difference in response characteristics during permanent faults and instantaneous faults, the reliability and superiority of the method under different working conditions are verified through simulation, the method makes up for the defects of an active injection type method during fault property recognition processing, and the method has the advantages of high reliability and high reliability. The method is not influenced by injection time and fault duration, fault property discrimination can be realized only through one-time injection, and the method is simple in operation, small in calculation amount and high in reliability.

The invention relates to the technical field of droop control, in particular to a voltage droop control optimization method and system based on parameter self-adaption and a medium, and the method comprises the steps: dynamically recognizing a voltage sensitive interval according to voltage fluctuation characteristics, determining critical voltage distribution data, and determining a switching trigger condition of a current power grid control mode according to the critical voltage distribution data; analyzing the correlation degree between the current power grid control mode switching event and the power grid stability based on the switching trigger condition to obtain a switching behavior risk level; reconstructing voltage droop control parameter adjustment direction logic based on the switching behavior risk level, and generating a stable direction vector; calibrating the original droop control output signal according to the stable direction vector, and generating a self-adaptive droop control output instruction; and distributing the adaptive droop control output instruction to each substation node for voltage regulation. The voltage droop control parameters are adaptively optimized through the real-time running state of the power grid, and parameter adaptive optimization of voltage droop control is achieved.

The invention provides a high-precision current limiting circuit of an LDO (Low Dropout Regulator) with an NMOS (N-channel Metal Oxide Semiconductor) tube as a power tube, which is applied to the technical field of current limiting circuits and comprises a voltage loop and a current loop, and the voltage loop is used for monitoring and stabilizing the output voltage VOUT of a power tube NM1; and the current loop is used for acquiring a sampling current according to the load current of the power tube NM1, comparing the sampling current with a reference current IREF, and when the sampling current is higher than the reference current IREF, driving and controlling the output voltage VOUT of the power tube NM1 to be reduced so as to limit the load current of the power tube NM1 to continue to rise. When the LDO works normally, the output voltage VOUT of the power tube NM1 is stabilized through the voltage loop, and when the load current is too high, the output voltage VOUT of the power tube NM1 is driven and controlled to be reduced through the current loop, so that the load current of the power tube NM1 is prevented from continuing to rise, and the stability and the safety of the LDO are improved.

Methods and apparatuses directed to. In some examples, a die package includes voltage logic that provides a voltage to a voltage rail, clock logic that generates a clock signal, and adaptive clock distribution logic that receives the clock signal and the voltage. The adaptive clock distribution logic can increment an event count when the clock signal is above a threshold frequency, or when the voltage is below a threshold voltage level. The die package also includes a processor that can monitor the event counts during operation and determine a status of the adaptive clock distribution logic based on the event counts. In some examples, the processor can test the adaptive clock distribution logic by causing the clock signal to operate above the threshold frequency, or causing the voltage logic to provide the voltage below the threshold voltage level. The processor can then read the event counts to determine the status.

A high-linearity grid voltage bootstrap circuit relates to the technical field of analog-to-digital conversion and comprises a first charge pump boosting unit, a second charge pump boosting unit and a grid voltage bootstrap unit, working states of a sampling switch are divided into a sampling state and a holding state, an input voltage VIN is boosted to a VG through the grid voltage bootstrap unit in a sampling stage, and the sampling switch is switched on; and the holding stage sampling switch is cut off, and charges are injected to the upper polar plates of the capacitors C3 and C4 of the gate voltage bootstrap unit through the first charge pump boosting unit and the second charge pump boosting unit respectively. According to the invention, the problem that the actual gate-source voltage is reduced due to the grid parasitic capacitance of the sampling switch is solved, and the layout area occupation is greatly reduced while the bootstrap voltage is improved; the proportion of the capacitor C3 and the capacitor C4 can be flexibly set to obtain the required bootstrap voltage; and the problem that the on-resistance of the sampling switch is increased due to the reduction of the gate-source voltage can be solved, and the linearity of the sampling switch is improved.

The invention discloses a grid-connected inverter control method, system and device and a medium. The method comprises the steps of obtaining a power grid operation parameter, a system power instruction and a direct current bus voltage provided by a photovoltaic side hybrid energy storage system; a virtual inertia parameter is dynamically adjusted through an active-frequency control loop of the virtual synchronous machine in combination with an adaptive inertia algorithm, and a virtual rotor angular speed and an active power reference value are obtained through calculation according to a second-order motion equation of the synchronous generator; in combination with a reactive power instruction, a virtual internal potential amplitude is calculated according to a reactive-voltage droop relation through a reactive-voltage control loop of the virtual synchronous machine; and generating a three-phase voltage reference signal of the grid-connected inverter through synchronous rotation coordinate transformation. According to the invention, the dynamic performance, the operation efficiency and the grid-connected stability of the system under complex working conditions are obviously improved.

The invention provides a SiC MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) driving method and system for quantitatively suppressing a voltage overshoot peak. The method comprises the following steps of: reducing drain-source voltage of a SiC MOSFET to a voltage range which can be detected by a post-stage circuit; the output of the degraded drain-source voltage is detected, and the overshoot peak value of the drain-source voltage is maintained and output; sampling the output drain-source voltage overshoot peak value; a pulse signal is output according to the current drop stage of the turn-off of the drain-source voltage identification device; operating the PI control module to obtain an output current value of the voltage-controlled current source, and outputting a voltage value corresponding to the output current of the voltage-controlled current source; a corresponding voltage value is used as input, a pulse signal triggers a voltage-controlled current source to output, extra driving current is injected into a grid electrode of the SiC MOSFET, and voltage overshoot peaks are regulated and controlled. According to the invention, the closed-loop control of the voltage overshoot peak value is realized, the voltage overshoot peak value is quantitatively suppressed, and the reliability and efficiency are improved.

The invention discloses an active discharge redundancy method for a crane, belongs to the technical field of active discharge of cranes, and aims to solve the problems of low discharge speed, incomplete discharge, single discharge means and incapability of discharging voltage of a fault branch and a bus capacitor of a high-voltage system when a fault occurs in the prior art. According to the method, a certain branch driver is reserved as a system branch for discharging of a system bus, and when other branches fail and cannot discharge, a system branch Km is adopted for discharging. When a system branch discharges, in order to reduce the discharge capacity of a driver of the system branch, low-voltage DCDC and PTC are adopted to discharge a bus capacitor in advance, and after the voltage is reduced to the voltage within the working range, the driver is adopted to perform active discharge, so that the active discharge time of the driver is shortened, and heating of the driver of the branch electric cylinder is reduced. When the whole vehicle breaks down seriously, the bleeder resistor is used for releasing bus voltage, and it is guaranteed that discharging is achieved in the fault state.

The invention discloses a tangential magnetizing block permanent magnet low-voltage regulation rate generator rotor structure. The voltage regulation rate of a generator is reduced from the angle of the shape of a block permanent magnet. An original permanent magnet is divided into three permanent magnets, the shapes of the three permanent magnets are changed on the premise that the number of the permanent magnets is not increased, and the shape of the rotor core is changed along with the change of the shapes of the permanent magnets. And the permanent magnets close to the air gap are trapezoidal permanent magnets, so that the magnetic resistance of a quadrature-direct axis armature reaction common magnetic flux path of the motor is reduced, the quadrature-direct axis magnetic flux is increased, the quadrature axis magnetic flux increment is greater than the direct axis magnetic flux increment, and the influence on the voltage regulation rate of the generator is greater. The permanent magnets close to the rotating shaft are isosceles trapezoid permanent magnets, and the permanent magnets in the middle are rectangular permanent magnets, so that the magnetic resistance of a direct-axis armature reaction magnetic flux path of the motor is increased, and the direct-axis magnetic flux is reduced. The shapes of the partitioned permanent magnets are matched, so that the output voltage of the permanent magnet generator is improved, and the voltage regulation rate of the generator is reduced.

A circuit for slew rate detection and phase control in a multi-phase converter is provided. The circuit includes a first comparator configured to trigger when an output voltage of the multi-phase converter falls to a first output voltage level threshold value. The circuit further includes a second comparator configured to trigger when the output voltage falls to a second output voltage level threshold value which is lower than the first output voltage level threshold value. The circuit further includes a timer configured to start to run for a predefined time window, when the output voltage of the multi-phase converter falls below first output voltage level threshold value. The circuit further includes phase control logic configured to distinguish the ramp rate of the output voltage of the multi-phase converter as corresponding to a slow-rate ramp, a mid-rate ramp or a fast-rate ramp based on the outputs of the first comparator, the second comparator and the timer and enable phases synchronously or asynchronously based on the distinguishing of the ramp rate of the output voltage of the multi-phase converter as corresponding to the mid-rate ramp or the fast-rate ramp.

The patent of the present invention discloses a special on-load voltage regulating switch for distribution transformer and an on-load voltage regulating distribution transformer. The switch includes a mounting main board, an insulating back plate, a driving mechanism component, a selection switch component, a switching switch component, and a transition element. The driving mechanism component includes a stepping motor, a gearbox, a bevel gear, a driving gear, and a square shaft. The rotational motion of the stepping motor is transmitted to the driving gear by means of the gearbox and the bevel gear. The driving gear drives the square shaft to rotate, and then drives the selection switch component and the switching switch component to move, completing the conversion of the voltage regulating gear. The on-load voltage regulating switch is miniaturized, and is installed in the distribution transformer without changing its conventional shape and volume. Frequent voltage adjustment of the distribution transformer under load is realized, the power supply voltage is stabilized, the loss is reduced, and a wide range of multi-gears and refined voltage regulation are realized. At the same time, the life cycle of the switch is equal to the life cycle of the distribution transformer body, and no maintenance is required during its life cycle, which improves the reliability of the on-load voltage regulation of the distribution transformer.

The invention provides a network construction control method and system for a static var generator without a super capacitor, and the method comprises the steps: obtaining a variable needed by the control of the static var generator, comprise a three-phase bridge arm voltage measurement value, a three-phase bridge arm voltage instruction value, a reactive power instruction value, an alternating voltage amplitude instruction value, an output reactive power measurement value, an output alternating current measurement value, an alternating voltage amplitude measurement value of a common coupling point, a direct-axis voltage measurement value and a quadrature-axis voltage measurement value; obtaining a three-phase modulation voltage through a voltage loop and an alternating current loop according to variables required by control and based on direct current voltage-frequency-phase control and reactive power-voltage droop control; and obtaining a switch tube control signal according to the three-phase modulation voltage, and completing network construction control of the static var generator according to the switch tube control signal. According to the invention, the stability of the DC voltage of the static var generator can be ensured without adding a super capacitor, and active support is provided for an AC side power grid.

The invention discloses a formation and capacity grading parallel detection system based on a high-voltage direct-current bus. A press device comprises a direct-current switch and at least one set of pull-out type charging and discharging probe module. And the input end of the direct-current switch is connected with the output end of the PCS equipment. Each charging and discharging probe module adopts a pull-out structure and comprises a mechanical frame, and a high-voltage direct-current bus, a bidirectional conversion module and a probe assembly which are integrally mounted in the mechanical frame; the high-voltage direct-current bus input end is connected with the direct-current switch output end; the bidirectional conversion module comprises two stages of conversion units; the first conversion unit is used for reducing the first voltage of the high-voltage direct-current bus into the second voltage or reversely increasing the voltage; the second conversion unit reduces the second voltage to the voltage required by charging and discharging of the battery or boosts the second voltage; the probe assembly is connected to the output end of the second conversion unit. The system is compact in structure, high in charging and discharging efficiency and convenient to maintain, and cables are saved.

The invention discloses a virtual synchronous machine active low-frequency oscillation suppression method based on power feedback compensation, and belongs to the field of new energy grid-connected converter control under large-scale new energy access. According to the method, the output voltage and current of the new energy converter are sampled, the instantaneous output active power and reactive power are calculated, and the average output active power and reactive power are obtained through a first-order low-pass filter; and then virtual synchronous machine active outer loop control based on output power feedback compensation and reactive outer loop control based on reactive-voltage droop are adopted to obtain reference values of a d-axis voltage amplitude and a voltage phase angle of new energy converter voltage inner loop control, and output voltage closed loop control is carried out. Under the condition that the output active control order and the steady-state characteristic are not increased, the output active dynamic overshoot and low-frequency oscillation suppression of the new energy converter based on the network construction control type virtual synchronous machine are effectively realized, the parameter value range is slightly constrained by the system stability, and the engineering application is simple.

This invention discloses a dedicated on-load tap changer for distribution transformers and an on-load tap-changing distribution transformer. The switch includes a mounting main board, an insulating backplate, a drive mechanism assembly, a selector switch assembly, a switching assembly, and a transition element. The drive mechanism assembly includes a stepper motor, a gearbox, a bevel gear, a drive gear, and a square shaft. The rotational motion of the stepper motor is transmitted to the drive gear via the gearbox and bevel gear. The drive gear drives the square shaft to rotate, which in turn drives the selector switch assembly and the switching assembly to complete the switching of the tap changer position. This invention achieves miniaturization of the on-load tap changer, allowing it to be installed in the distribution transformer without altering its conventional shape and volume. It enables frequent voltage adjustments under load, stabilizing the supply voltage, reducing losses, and achieving wide-range, multi-position, and precise voltage regulation. Furthermore, the switch's lifespan is equal to that of the distribution transformer itself, requiring no maintenance during its lifespan, thus improving the reliability of on-load tap changing in distribution transformers.

The invention discloses a self-adaptive virtual inertia control system and method for a UPQC, and relates to the technical field of power distribution networks. A frequency voltage droop unit is used for applying active droop frequency control and reactive droop voltage control to a self-adaptive virtual synchronous machine; the self-adaptive virtual inertia calculation unit is used for determining a small disturbance quantity corresponding to actual active power, a small disturbance quantity corresponding to actual reactive power and a small disturbance quantity corresponding to actual frequency which are output by the self-adaptive virtual synchronous machine based on a virtual synchronous machine algorithm, active droop frequency control and reactive droop voltage control; and based on the small disturbance quantity corresponding to the actual active power, the small disturbance quantity corresponding to the actual reactive power and the small disturbance quantity corresponding to the actual frequency, a self-adaptive adjustment model of the virtual inertia is determined. The problems of power fluctuation and overcurrent in the transient process of traditional VSG control are effectively solved, better dynamic response is achieved, and the stability of the frequency and voltage of the independent microgrid is improved.

The invention discloses a voltage reduction device and system of a driving motor and a vehicle. The device comprises a controller and a voltage reduction circuit. The controller is connected with the step-down circuit and is used for sending a step-down signal to the step-down circuit if the required working voltage of the first driving motor is smaller than the voltage of the power battery; the step-down circuit is used for reducing the voltage provided by the power battery to the required working voltage in response to the step-down signal and then transmitting the voltage to the first driving motor. Therefore, according to the device, the voltage provided by the power battery is reduced to the required working voltage and then transmitted to the first driving motor, it can be guaranteed that the first driving motor works at a high-efficiency point, and therefore the energy consumption of the whole vehicle is reduced.

Systems and methods as described herein may take a variety of forms. In an example, a circuit includes a first voltage stepdown module and a second voltage stepdown module. The first voltage stepdown module has a supply voltage and a first reference voltage as inputs, and an intermediate stepped down voltage as an output, the intermediate stepped down voltage being electrically coupled to a feedback input of the first voltage stepdown module. The second voltage stepdown module includes a low-dropout voltage regulator having the intermediate stepped down voltage and a second reference voltage as inputs and a target voltage as an output.

The invention relates to the technical field of data processing, in particular to a method and a system for monitoring a test process of a motor stator in a vacuum environment. The method comprises the following steps: in a first pressure environment, applying an alternating current test voltage to the stator and collecting a partial discharge signal; the stator is arranged in the sealed cavity; applying a constant voltage to the stator, wherein the amplitude of the constant voltage is lower than the partial discharge initial voltage; reducing the air pressure in the sealed cavity until continuous partial discharge is collected again, and taking the air pressure value in the sealed cavity at the moment as vacuum initial pressure; and based on a two-dimensional data pair formed by the partial discharge initial voltage and the vacuum initial pressure, mapping the two-dimensional data pair to a preset diagnosis map, and classifying the insulation state of the motor according to the region where the two-dimensional data pair is located. According to the invention, missed detection and false detection in the stator detection process can be reduced.

The invention discloses a VSG current balance control method and system in a voltage imbalance state, and relates to the technical field of power electronics and power system application, and the method comprises the steps: taking current balance control as a core of integral control, building a VSG model, analyzing the output condition of the VSG in an imbalance power grid state, and obtaining a VSG current balance control result. VSG is controlled through active-frequency and reactive-voltage droop control, the instantaneous output power of the VSG is analyzed according to the instantaneous power theory, positive and negative sequence currents are decomposed when an unbalanced fault occurs in a power grid, and the targets of current balance and power constancy are achieved by controlling the positive and negative sequence currents and adding voltage correction. According to the invention, the current and electric energy quality control of the VSG is designed, and the output current balance, the active power constancy or the reactive power constancy are realized on the premise of not changing the characteristics of the VSG.

A circuit includes a supply node receiving a supply voltage; an output node providing a regulated voltage; startup circuitry coupled to the supply node; current generator circuitry coupled to the startup circuitry and producing a current; a bandgap node coupled to bandgap circuitry to receive a bandgap voltage; multiplier circuitry coupled to the bandgap node and the current generator circuitry to receive and apply scaling to the current; a first transistor providing a threshold voltage drop across the first and second transistor nodes; a first resistive element interposed between the first transistor and the bandgap node; a second resistive element coupled between ground and the second node of the first transistor; and an operational amplifier receiving a pre-regulated voltage as a function of the bandgap voltage, the threshold voltage across the first transistor, and a voltage drop across the first and second resistive elements.

Voltage droop is mitigated within an integrated circuit (IC) device including a first processing device and scheduler circuitry. The first processing device executes operations of a first workload. The first processing device is associated with a first processing device voltage droop characteristic. The scheduler circuitry receives the first workload. The first workload is associated with a first workload voltage droop characteristic. Further, the scheduler circuitry assigns the first workload to the first processing device of the IC device based on the first workload voltage droop characteristic and the first processing device voltage droop characteristic.

The invention discloses a frequency damping-based parameter identification method for active power control of a grid-forming photovoltaic converter, and the method comprises the steps: collecting the voltage and current of a grid-connected point, and obtaining a corresponding DC component after coordinate transformation; obtaining active power and reactive power output by the photovoltaic grid-connected converter and active power and reactive power after passing through a low-pass filter; outputting frequency and voltage amplitude through active power control and reactive-voltage droop control of frequency damping; and the voltage amplitude and the feedback deviation are sent to a voltage and current double closed loop, and a converter driving signal is generated through modulation. When parameter identification is carried out on an active power control equation based on frequency damping, an active power control model is discretized and then transformed into a difference equation; unknown parameters in the difference equation are identified, and active power control parameters are calculated. According to the method, frequency damping optimization enhancement in active power control of the grid-forming type photovoltaic converter can be realized, identification prediction of control parameters is realized, and the photovoltaic converter is enabled to operate more stably.

A pulse generator is disclosed. The pulse generator includes a DC source; a plurality of switches, a transformer; and a pulsing output. The pulse generator can be coupled with a plasma chamber. The pulsing output outputs high voltage pulses having a peak-to-peak voltage greater than 1 kV and a voltage portion between consecutive high voltage bipolar pulses that has a negative slope that substantially offsets the voltage reduction on a wafer within a plasma chamber due to an ion current. The resulting voltage at the wafer may be substantially flat between consecutive pulses.

A circuit detects a voltage droop exhibited by a power supply. A first signal delay line outputs a first delayed signal. A second delay line outputs a second delayed signal. A phase detector compares the first and second delayed signals and outputs a comparison signal indicating which of the first and second signal delay lines exhibits a shorter delay. A reset circuit resets the first and second signal delay lines in response to the comparison signal, and a clock controller outputs a command to adjust a clock frequency or engage in other mitigation measures based on the comparison signal.

The invention discloses a load optimization configuration method for a station service system under a generator set leading phase working condition, and relates to the technical field of power plant optimization operation, comprising the following steps: station service power is used as a basic load for maintaining normal operation of a power plant, and the voltage quality is directly influenced by the state of a generator; during leading-phase operation, the voltage of a generator stator is reduced, so that the voltage of auxiliary power is reduced, the normal operation of auxiliary equipment is influenced, and even the safety and stability of a power plant are threatened. According to the method, an optimization model is constructed by establishing a plant system load model and combining the relation between terminal voltage and reactive power and plant bus voltage constraint. The particle swarm optimization algorithm is used for solving, the leading-phase reactive power is maximized, and meanwhile safe operation of the system is ensured. The method not only improves the reactive power regulation capability of leading phase operation, but also enhances the economical efficiency and stability of power plant operation, and has important practical application value.

The invention discloses a voltage control method and system based on the residual capacity of a photovoltaic inverter, and relates to the technical field of power grid control optimization, and the method comprises the following steps: obtaining a power grid operation state and an inverter operation state, and carrying out the analysis to obtain the residual capacity of the inverter; adjusting the working mode of the inverter according to the residual capacity of the inverter, wherein the working mode of the inverter comprises a normal state mode, a fault ride-through mode and a derating mode; according to the working mode of the inverter, combining the active frequency droop, the reactive voltage droop and the residual capacity of the inverter to obtain a voltage regulation reference value; and adjusting the output voltage of the inverter according to the voltage adjustment reference value, and controlling the voltage of the power grid through the output voltage of the inverter. The method is used for solving the problem of multi-scenario adaptability of the residual capacity of the photovoltaic inverter to control the voltage of the distribution network.

Embodiments include, in response to monitoring the processor during operation, detecting a first number of core recovery events in the processor, determining that the first number of core recovery events satisfies a first condition of a first core recovery event threshold, and modifying a value of at least one droop sensor parameter of the processor by a first amount. The at least one droop sensor parameter affects sensitivity to voltage droop. In response to modifying the value of the droop sensor parameter by the first amount, a second number of core recovery events in the processor is detected. A second condition that the second number of core recovery events satisfies a second core recovery event threshold is determined, and the value of the at least one droop sensor parameter is modified by a second amount.

Methods and systems are provided for controlling an electron beam generated by an X-ray tube assembly including a unipolar cathode with a long cable between driving electronics of the cathode and the X-ray tube. A voltage supplied to a gridding electrode of the cathode is controlled by a multi-stage switching unit including a first control circuit and a second control circuit. A bias voltage for switching the cathode on is generated by a high precision voltage source of the second control circuit, and a gridding voltage for switching the cathode off is generated by voltage sources of the first control circuit. A time taken to transition between the gridding voltage and the bias voltage is advantageously reduced by decreasing the supplied voltage to a common voltage (e.g., 0 V) in a first step, and then increasing the supplied voltage to the bias voltage or the gridding voltage in a second step.