496 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 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 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.

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.

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.

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.

There is described a method of monitoring an electronic circuit voltage droop response; the method comprising: switching activity, in response to a voltage droop event, from a nominal clock source to a fallback clock source; and, optionally, switching activity, in response to a voltage recovery event, from a fallback clock source to a nominal clock source; wherein a voltage recovery event comprises a predetermined duration according to a configurable delay value without a voltage droop. The method further comprises at least one of: measuring a number of instances of switching from a nominal clock source to a fallback clock source; measuring an actual duration during which activity proceeds according to the fallback clock source without a voltage droop; measuring a fallback duration during which activity proceeds according to the fallback clock source; and measuring a number of instances of switching from a fallback clock source to a nominal clock source occurring during a voltage droop. Finally, the method may comprise modifying the switching to optimise activity efficiency based on the measuring. There is also described an electronic circuit configured to monitor voltage droop response of another electronic circuit according to the method.

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 direct current (DC) microgrid is provided. The microgrid includes a power converter, a power-voltage (PV) droop control loop, and an inner current control loop of the power converter. The PV droop control loop is configured to receive measurements of a droop current quantity that is not a DC bus current of the DC microgrid. The droop current quantity is used to determine a droop power quantity selected as a power quantity in a PV relationship. The PV droop control loop is further configured to derive a current reference based on droop in the droop power quantity. The inner current control loop is configured to control operation of the power converter by deriving a measured current corresponding to the control quantity based on the measurements of the droop current quantity, directly comparing the current reference with the measured current, and generating switching signals of switches in the power converter.

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 present application discloses a power supply control method, a power supply control apparatus, a control device, a control circuit, and a storage medium. The method is applied to a control device in a control circuit; the control circuit further comprises a power supply circuit and a sampling device; the power supply circuit comprises N power supplies, wherein N≥2; each power supply is provided with a power converter; the sampling device is separately connected to the power supplies and the control device; the control device is further connected to the power converters of the power supplies; an output voltage of each power supply is determined by its own adjustment ratio and a preset reference voltage. The method comprises: acquiring power supply state parameters of each of the N power supplies, so as to determine an abnormal power supply; and reducing the present adjustment ratio of the abnormal power supply, so as to control the abnormal power supply to reduce the output voltage on the basis of the present adjustment ratio reduced and the reference voltage. The solution of the present application can implement balanced output of N power supplies, ensuring that the N power supplies can work safely and reliably for a long time.

The present techniques relate to voltage droop detection and there is disclosed circuitry for detecting a voltage droop event, the circuitry configured to: receive a clock signal from a clock distribution network; obtain, from a storage, a first predetermined value, a second predetermined value and a predetermined threshold count; obtain one or more measurement values associated with a system voltage; when a first measurement value of the one or more measurement values reaches the first predetermined value, initiate a count of clock cycles until a subsequent measurement value of the one or more measurement values reaches the second predetermined value, the second predetermined value being different from the first predetermined value; and when the count of clock cycles is lower than the predetermined threshold count, cause a control entity to take mitigation action.

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 invention discloses a method for reducing the turn-on voltage of a gallium oxide diode based on hydrogen treatment, mainly solving the problem of the high turn-on voltage of existing gallium oxide diodes. The solution is as follows: According to the concentration at which hydrogen is prone to explosion and the diffusion rate of hydrogen atoms in the gallium oxide material, the hydrogen concentration is selected to be 0.1% - 4% and 75.6% - 100%; Multiple gallium oxide diode devices are selected and placed in a single layer and fixed at the bottom of a storage tank and sealed, and then the selected hydrogen is filled into the storage tank until the pressure in the tank reaches 0.1 - 3 MPa; A constant temperature box device is selected, and its working temperature is set to 20 - 350 °C according to the ignition temperature of hydrogen; The storage tank filled with hydrogen and containing devices inside is placed in the constant temperature box, the power supply is turned on and left to stand for 1 - 100 days, and then the power supply is turned off and the devices are taken out, achieving the reduction of the turn-on voltage of the devices. The present invention effectively reduces the turn-on voltage of the gallium oxide diode and can be applied to high-frequency power electronic systems.

The invention relates to a power-off detection circuit and a power-on and power-off indication circuit. The power-off detection circuit is used for generating a power-off marking signal when the power supply voltage is in a power-off state, the on resistance of the variable resistance unit is increased along with the reduction of the power supply voltage in the power-off state so as to increase the voltage of the first node, and the current in the mirror image branch can be increased along with the increase of the voltage of the first node so as to increase the voltage of the second node. According to the power-down mark output module, when the voltage of the second node is lower than a set value, an output power-down mark signal is converted from a first level to a second level, that is, a reliable power-down mark signal is formed, and generation of the power-down mark signal is irrelevant to whether the chip is in a low-power-consumption mode or not. Therefore, the chip can be powered off stably and reliably, and related circuits can be controlled or reset by using the power-off marking signal. The power-on and power-off indicating circuit comprises the power-off detection circuit.

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.

The utility model belongs to the technical field of flyback switching circuits, and particularly discloses a flyback switching circuit which comprises a transformer T1 and a switching power supply chip U2, the primary side of the transformer T1 is connected with rectified voltage, the primary side of the transformer T1 is connected with a diode D6 and a diode D7 in parallel, the rectified voltage supplies energy to the switching power supply chip U2, and the diode D6 supplies energy to the switching power supply chip U2. A pin 7 of the secondary side of the transformer T1 is connected with a pin 6 of the switching power supply chip U2 through a diode D9 and a resistor R36, and the pin 7 of the secondary side of the transformer T1 is further connected with a pin 5 of the switching power supply chip U2 through a resistor R37. According to the utility model, reverse voltage tips are absorbed through the half-wave rectification filter circuit, jitter frequency control is carried out on the switching power supply chip U2 according to EM I signals, the whole circuit is convenient to stably output voltage, switching loss and current peaks during light load and even no load are reduced, loss of an auxiliary power supply is reduced, and an extra EM I filter device does not need to be provided for the auxiliary power supply.

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.