362 results about "Voltage droop" patented technology

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.

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 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.

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 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 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 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.

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.

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.

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.

The invention discloses a control method and system for participation of a network construction energy storage type SVG in frequency modulation and voltage regulation of a power grid, and the method comprises the steps: constructing a second-order synchronous phase modifier model in a network construction energy storage type SVG control system, and generating a phase angle delta and an angular frequency omega; obtaining a frequency deviation according to the angular frequency omega and the grid-connected frequency omega ac; generating an internal voltage instruction value by adopting reactive power-voltage droop control according to the deviation between the grid-connected point voltage and the reference voltage; and according to the frequency deviation and the voltage deviation, a reactive-voltage droop coefficient and a virtual admittance parameter are adjusted in real time, a current reference value is generated by using the updated virtual admittance parameter, and finally voltage and frequency adjusting current is output through current decoupling and PWM driving. Under the condition of a weak power grid or a fault, the networking energy storage type SVG can stably generate voltage source characteristics without a phase-locked loop; and the energy storage unit can quickly release or absorb active power to realize efficient inertial support.

The invention discloses a power feedback and phase compensation-based oscillation suppression strategy for a multi-configuration-network converter grid-connected system. The multi-configuration-network converter grid-connected system mainly comprises the following modules: a power calculation module, a virtual speed regulator module, a virtual rotor module, a reactive power-voltage droop control module and a voltage and current double-closed-loop module. In the virtual rotor module, the output active power and the output power angle are subjected to a differential link to construct a power feedback loop, the difference value between the output angular frequency of the virtual rotor and the rated power grid frequency is used as the phase compensation amount, and a power feedback and phase compensation strategy is applied; the problem that after grid connection, a multi-grid converter is prone to being disturbed by the power grid frequency to generate violent power oscillation is solved.

The invention discloses a grid-forming type bipolar photovoltaic power generation system and a control method, a bipolar photovoltaic converter, namely a DC / DC converter and a DC / AC inverter, is configured between a photovoltaic DC power supply and a micro-grid bus, and a three-phase LC filter is configured between the output side of the inverter and the micro-grid bus; calculating a photovoltaic voltage reference value based on the photovoltaic voltage, the photovoltaic current and the DC voltage output by the converter by using a DC voltage-output power droop control structure so as to generate a PWM signal for controlling the converter; determining a vector angle of the inverter based on the DC voltage and rated parameters of the inverter, calculating reactive power by combining the voltage and current of the micro-grid bus, and further obtaining an output voltage amplitude of the inverter through a power-voltage droop equation; and generating a three-phase voltage control signal according to the voltage amplitude, the vector angle and the inductive current of the filter, and further generating an SVPWM signal for controlling an inverter, thereby realizing the target of automatically distributing the load capacity.

A voltage droop detection circuit can be used to detect a voltage droop in an integrated circuit (IC) device. The voltage droop detection circuit may include a chain of inverting stages, and each inverting stage may include a P-type transistor and an N-type transistor. The chain of inverting stages can be initialized to alternating logic states during an initialization phase of a clock cycle, and an evaluation pulse can be inputted into the chain of inverting stages during an evaluation phase of the clock cycle. A voltage droop may be detected if a number of inverting stages that are able to switch output logic states from their respective initialized logic states is smaller than a nominal value indicating a number of inverting stages that are able to switch their respective output logic states under normal voltage condition.

The invention provides an output voltage automatic regulation circuit and an illumination lamp, and the circuit comprises a constant voltage module which is used for converting an external alternating current into a constant voltage direct current; the linear constant current module is used for converting the constant voltage direct current into constant current; a voltage threshold value is set in the MCU control module, and the MCU control module is used for detecting the voltage to ground of the linear constant current module and outputting a PWM signal with a corresponding duty ratio according to a comparison result of the voltage to ground and the voltage threshold value; and the constant-voltage loop regulation module is connected in series between the MCU control module and the constant-voltage module and is used for receiving the PWM signal and carrying out voltage division and RC filtering on the PWM signal to obtain a processing voltage, and the processing voltage is used as a reference voltage of an operational amplifier in the constant-voltage loop regulation module. Compared with the prior art, the output voltage of the constant-voltage module can be intelligently and dynamically adjusted in real time, the loss of the linear constant-current module is reduced, and the purposes of improving the driving efficiency and reducing heating are achieved.

The present application discloses a linear voltage stabilization circuit, which belongs to the field of integrated circuit technology and includes: an amplifying unit, a voltage regulating unit, and a voltage dividing unit, wherein the amplifying unit, the voltage regulating unit, and the voltage dividing unit are connected in sequence; the amplifying unit, the voltage dividing unit, and the fourth transistor of the voltage regulating unit constitute a voltage feedback slow loop; the second capacitor, the third transistor, and the second transistor of the voltage regulating unit constitute a fast response loop. The present application uses a capacitor to quickly couple a voltage drop signal to a transistor, further regulates the voltage by regulating the current flowing through the transistor, reduces common-mode noise interference, and only has a built-in on-chip compensation capacitor of the picofarad level to achieve a faster transient response when the output voltage changes rapidly. The circuit's own characteristics are used to effectively offset common-mode noise, and have an excellent power supply rejection ratio in both low-frequency and high-frequency environments.

A plasma power supply (10) and a control method therefor, and a fusion reaction system. The plasma power supply (10) comprises: a breakdown power supply module (101) and an extraction power supply module (102). The breakdown power supply module (101) is used for: outputting a first voltage to a plasma generator (20) which generates plasma under the application of the first voltage; and when the output voltage is decreased from the first voltage to a second voltage, maintaining the output of the second voltage to the plasma generator (20). The extraction power supply module (102) is used for forming an electric field between the plasma generator (20) and a housing (30) of a nuclear fusion reaction chamber, and when the plasma generator (20) generates the plasma, forming a plasma current between the housing (30) and the plasma generator (20) on the basis of the plasma and the electric field. The plasma power supply (10) allows for direct formation of the plasma current in the nuclear fusion reaction chamber, thereby simplifying the formation process of the plasma current.

Various embodiments include methods performed by a processor system of a computing device for dynamically adjusting voltages for client components. The processor system may identify a potential current profile for a client use case, identify a voltage reduction for the client use case, and transmit the voltage reduction for the client use case to a system power manager. The processor system may identify the potential current profile for the client use case based on a maximum current for the client and a potential maximum current for the client use case. The processor system may cause the system power manager to reduce a client voltage to a voltage level that maintains client voltage at a level greater than a minimum client voltage during a voltage droop caused by a potential maximum current for the client use case.

The invention discloses a charging circuit, and the circuit comprises a DC source which provides a DC power supply voltage; the at least one power converter is connected with the direct-current source and converts the direct-current power supply voltage into output voltage; the at least one output port is respectively connected with the power converter and is used for charging a load; the control circuit is used for generating a switch control signal of the power converter according to a state signal of the load and the output voltage so as to adjust the output voltage, the state signal of the load represents whether the output port has the load, and the power converter comprises an output capacitor which is connected between the first end and the second end of the output port; the charging circuit comprises a bleeder circuit which provides a bleeder channel for the output capacitor. Under the conditions that simple devices are used and the cost is low, the bleeder circuit multiplexes the power converter or independently provides a bleeder channel for the output capacitor, stable output voltage is output when the output port has a load, and the output voltage is reduced to a preset value when the output port is not connected with the load.

The present invention provides a method and device for reducing the power consumption of a speaker module. The method comprises: receiving sound characterization parameters of the speaker module; determining the initial output voltage of the speaker module based on the sound characterization parameters and a mapping relationship library; and reducing the power consumption of the speaker module based on the initial output voltage. To address the problems of the prior art, the method and device for reducing the power consumption of a speaker module provided by the present invention automatically adjust the output voltage of the speaker module according to different sound emission scenarios, thereby reducing the required voltage while maintaining the original low-frequency performance of the overall system, thereby reducing power consumption.

The invention provides a method and a system for improving the partial discharge measurement sensitivity of a capacitor power-taking device, and the method comprises the steps: a measurement impedance coupling capacitor and a measurement impedance are connected in series and then are connected with a measured capacitor power-taking device in parallel, and pulse current generated by the partial discharge of the measured capacitor power-taking device enters a detection loop through the coupling capacitor; applying a pre-applied voltage to the tested capacitor power-taking device, wherein the duration time is a first preset time; reducing the voltage to the measurement voltage of partial discharge, and measuring the first open-circuit and short-circuit partial discharge capacity of the secondary end of the measured capacitor power taking device under open circuit and short circuit through the detection loop; reducing the voltage to a second preset measurement voltage, and measuring second open-circuit and short-circuit partial discharge amounts of the measured capacitor power taking device at the secondary end under open circuit and short circuit through the detection loop; and based on the first open circuit and short circuit partial discharge capacity and the second open circuit and short circuit partial discharge capacity, determining the partial discharge capacity of the capacitor power taking device. And the sensitivity and the accuracy of partial discharge measurement are improved.

The invention discloses a distributed architecture voltage frequency control method and a distributed architecture voltage frequency control system for a DRU-sent network construction energy storage new energy island. The island comprises a plurality of new energy stations, matched new energy storage stations and a DRU alternating current side energy storage station. Aiming at DRU side energy storage, on the basis of keeping active-frequency droop control, a reactive-voltage droop loop is replaced by a DC power-voltage control loop, and the DRU is controlled to send a power tracking scheduling instruction by adjusting an output voltage; for new energy side energy storage, active-frequency droop and reactive-voltage droop are adopted to construct a local voltage frequency, an active power compensation instruction distributed by a system-level constant-frequency control loop is received, a local active reference value is corrected, and system frequency indifference adjustment is realized. The method adapts to the specific power-voltage coupling characteristic of the DRU, the frequency can be kept stable when the new energy output fluctuates, the power is constantly sent out according to the scheduling instruction, and the operation reliability and schedulability of the island system are improved.

The invention discloses a control method and device for suppressing active oscillation of an SG-VSG parallel system, electronic equipment and a storage medium. The method comprises the following steps: adjusting terminal voltage of an SG according to an SG power reference value and excitation voltage; inputting the reactive power of the VSG into a reactive power-voltage droop control module to obtain the voltage amplitude of the VSG; inputting the VSG power reference value and the active power of the VSG into a swing equation module, and outputting a phase angle of the VSG; the phase angle of the VSG and the voltage amplitude of the VSG are input into a voltage and current double-closed-loop module, and modulation reference voltage of the VSG is output; and inputting the modulation reference voltage of the VSG into a PWM modulation module to generate a switching signal, and controlling the opening and closing of an IGBT in the fan inverter to realize the adjustment of the voltage phase angle of the VSG. An output power high-frequency component is introduced into a VSG control structure, so that power fluctuation is reduced, the power angle response speed of the VSG and the power angle response speed of the SG tend to be consistent, and therefore power oscillation suppression is effectively achieved.

The invention relates to a network construction type control technology, and aims to provide a network construction converter low-voltage fault ride-through control method based on adaptive synchronization. The method comprises the steps that phase-locked loop control, active-frequency droop control, reactive-voltage droop control and voltage and current control are introduced in the operation process of a network construction converter; the first two control links are used for enabling the network construction converter to have equivalent adaptive angular frequency and calculating to obtain a phase angle; and the last two control links are used for calculating a modulation voltage component and generating a three-phase voltage modulation wave as a control signal of an internal switching device of the network construction converter. According to the method, a more stable converter reference power grid phase angle can be obtained, impulse and interference caused by serious faults of the power grid are reduced, the operation state of the grid-forming converter is automatically adjusted in the fault period, smooth transition is achieved, and the operation stability is improved; based on power droop control, the grid-forming converter has a frequency modulation function similar to that of a synchronous generator, and provides damping and inertia support for the system.

A droop detector includes a phase generator generating a pulse responsive to a clock signal; an edge detector generating a first signal in response to the pulse; and a time-to-digital converter that includes N time-to-digital converter units. The time-to-digital converter generates an N-bit value representative of the timing difference between the edge of the pulse and the first signal. A capacitance associated with a subset of the time-to-digital converter units is adjusted during a calibration time to cause the difference between the arrival times of the data and clock at the jth time-to-digital converter unit to be greater than the difference between arrival times of the data and clock at the (j+1)th time-to-digital convert unit. The data terminal of the flip-flop of each time-to-digital converter unit is responsive to the first pulse, and the clock terminal of the flip-flop of each time-to-digital converter unit is responsive to the first signal.

To provide a control circuit capable of suppressing overshoot more than before and stabilizing an output voltage.SOLUTION: A control circuit 100 includes: a soft-start control unit 130 that provides a soft-start period when a start-up voltage Vcc of a switching power supply 1 exceeds a predetermined start-up threshold voltage or when a COMP voltage becomes equal to or lower than a predetermined standby voltage and then exceeds the standby voltage again; an error voltage dischargeable period setting unit 140 that sets an error voltage dischargeable period during which the COMP voltage can be discharged based on the soft-start period; and an error voltage discharge unit 170 that sets, as a discharge period, a period from when a feedback voltage FB exceeds a predetermined error voltage discharge threshold value to when the feedback voltage falls below an error voltage discharge threshold value or when the COMP voltage decreases to an oscillation stop voltage, whichever comes first, and discharges the COMP voltage during the discharge period within the error voltage dischargeable period.SELECTED DRAWING: Figure 2

This invention discloses a voltage control method and system based on the remaining capacity of a photovoltaic inverter, relating to the field of power grid control optimization technology. The method includes the following steps: acquiring the power grid operating status and the inverter operating status, and analyzing to obtain the remaining capacity of the inverter; adjusting the inverter operating mode according to the remaining capacity, wherein the inverter operating mode includes normal mode, fault ride-through mode, and derating mode; obtaining a voltage regulation reference value based on the inverter operating mode, combined with active power frequency droop, reactive power voltage droop, and the remaining capacity of the inverter; adjusting the inverter output voltage according to the voltage regulation reference value, and controlling the grid voltage through the inverter output voltage. This invention addresses the multi-scenario adaptability problem of controlling distribution network voltage using the remaining capacity of a photovoltaic inverter.

Aspects of the disclosure are directed to variable shift frequency implementation. In accordance with one aspect, the disclosure includes synthesizing a divided clock (511) from a shift clock (501) with a divided frequency equal to a reference frequency divided by a selected integer divisor in a logical built-in self-test (LBIST) mode; transitioning the LBIST mode from a shift state to a capture state by enabling a capture control enable signal (502) while pacing with the divided clock (511); generating a stretched capture control enable signal from the capture control enable signal using a slow cycle programmer (SCP, 530) with a plurality of quad stage pipelines; and transitioning the LBIST mode from the capture state to a subsequent shift state with the stretched capture control enable signal in a HIGH state to mitigate voltage droop.