241 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 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.

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 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.

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.

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.

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 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 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.

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.

The invention discloses a self-adaptive control method and system for high and low voltage fault ride-through of a network-constructed converter, and relates to the field of network-constructed converters. The existing network-forming converter is difficult to consider voltage source characteristic maintenance and current safety amplitude limiting in a fault ride-through period. The method comprises the following steps: acquiring voltage amplitudes of a grid-connected point and an infinite bus before and after a fault, and calculating a ratio of products of the voltage amplitudes to judge a fault state; based on the ratio, the active power before the fault, the power grid impedance and the power angle variation, adaptively calculating an active power reference value; in response to the fault state, a reactive power reference value is calculated with the aim of ensuring that the current does not exceed the safety limit value; and finally, inputting the power reference value to an inherent active-frequency and reactive-voltage droop control ring of the converter to complete fault ride-through. According to the technical scheme, the external characteristics of the voltage source of the grid-forming converter can be kept during the fault period, internal coordination of power support and equipment safety is achieved, and the adaptability and stability of the system under different fault working conditions are improved.

The invention discloses a hybrid direct current circuit breaker based on series voltage injection and parallel current injection, which comprises a main circuit, a series injection module, a parallel injection module and a main power electronic module, and is characterized in that when a main loop generates a fault current, the series injection module injects a reverse voltage to the main loop by utilizing the coupling effect of a transformer; reducing the fault current of the main loop and inhibiting the rising rate; the parallel injection module enables a main loop to inject oscillation current in parallel through high-frequency on-off operation, so that mechanical switch current in the main loop oscillates around 0 at high frequency and low amplitude, and arc-free breaking of a mechanical switch MS is guaranteed; and the main power electronic module is turned off after the MS contact is completely separated, and fault current is absorbed through a capacitor in the main power electronic module to finish circuit breaking. According to the circuit breaker disclosed by the invention, under the condition of ensuring low on-state loss during normal operation of a line, no-arc breaking of a mechanical switch is ensured, the pressure of a power electronic device is greatly reduced, and particularly, the pressure of a current device needing to be turned on and turned off at high frequency is reduced.

The application discloses a kind of traction network impedance simulation system and control method based on voltage source converter, and main substation is simulated by three-phase transformer, and traction substation is simulated by single-phase transformer.Three-phase transformer steps down power supply voltage, and the voltage on the high-voltage side of the single-phase transformer of the traction substation group comes from the same two-phase voltage of the three-phase transformer, which supplies the traction network after stepping down the voltage. Among them, for the impedance simulation of the traction network, the movement of the train is equivalent to the change of the line impedance, and the VSC is used to simulate the impedance of the traction network. The VSC is used to realize the change of the impedance of the traction network on both sides of the train during the train operation. The VSC device is used to simulate the impedance of the traction network on both sides of the train during the train operation, and relevant researchers can use the invention to carry out experimental verification of the related theory of the new type of substation group bilateral traction power supply system, and promote the development of the new type of substation group bilateral traction power supply technology.

The present invention provides a switching power supply device equipped with an auxiliary winding short circuit detection function and capable of switching to sleep mode. [Solution] A switching power supply device 100 comprising a transformer unit TR1, a primary side circuit 101, a control unit 102, a secondary side circuit 104, and an auxiliary winding side circuit 103, wherein the starting circuit of the control unit 200 has a function to stop the output of a drive signal when the number of times the power supply voltage rises from the stop voltage to the operating start voltage reaches a predetermined set number of times, thus fulfilling a stop condition, and the secondary side circuit 104 is characterized by comprising a detection circuit 105 that outputs a feedback signal according to the error between the output voltage and the target voltage, a voltage switching circuit 106 that lowers the target voltage and lowers the output voltage from the first voltage to the second voltage when a sleep signal is input, and a discharge circuit 107 that forms a discharge path for the smoothing capacitor C9 so that the stop condition is not met during the process of lowering to the second voltage.

The application discloses a control system and implementation method for improving instantaneous power of a diesel generator, comprising a super capacitor and a super capacitor, the super capacitor and the super capacitor are connected with an inverter through a relay normally closed contact, the inverter comprises four IGBT tubes; the control system further comprises a diesel generator, a voltage monitoring sensor, a power load, one end of the diesel generator is connected with a rectifier voltage stabilizer, the other end is connected with the ground, one end of two input ends of the voltage monitoring sensor is connected with the rectifier voltage stabilizer, the other end is connected with the ground, one end of an output end of the voltage monitoring sensor is connected with a relay coil, the other end of the relay coil is connected with the ground, one end of the power load is connected with the rectifier voltage stabilizer, and the other end is connected with the ground. The application has the following advantages: when instantaneous voltage reduction trend appears due to sudden increase of the power load, the super capacitor is used as a supplementary energy source, instantaneous output power of the diesel generator is improved, and stable voltage and frequency are quickly responded.

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 discloses a self-synchronizing voltage source control method based on damping and droop coefficient independent adjustment, and belongs to the field of new energy power generation. The control method comprises the steps that an active-frequency droop coefficient m and a virtual damping coefficient D are designed, so that the steady-state active power is only determined by m, and independent adjustment of m and D is achieved; and generating a terminal voltage amplitude instruction through the reactive power-voltage droop coefficient n, the reactive power deviation delta Q and the output voltage zero-sequence component u0 to realize reactive power-voltage droop control. And the reactive power-voltage droop coefficient n independently adjusts the dynamic response of the reactive power and the voltage amplitude, and does not influence the steady-state characteristic of active power-frequency droop control. Compared with the prior art, only the network side voltage needs to be sampled, the hardware cost is saved, and grid-connected pre-synchronization can be achieved without obtaining the total impedance on the line.

To realize good commutation while simplifying the circuitry and control.SOLUTION: This circuit is provided with switches V1, V3 and V4 for respectively selecting a voltage source 11 for outputting a voltage S1, a voltage source 13 for outputting a voltage S3 and a voltage source 14 for outputting a voltage S4 to an outputting terminal 10, and a current source 12 connected between the outputting terminal 10 and a ground terminal 9 through the switches S3. A control part 20 turns on the switch V1 after the voltage is lowered to the vicinity of the voltage S1 by the second half-wave resonance to maintain the voltage Vop1 at a low level, and turns on the switch S3 to make the current of the first half-wave resonance flow in a resonance loop including a capacitor load, an inductor Ln, etc., to raise the voltage Vop1. When the voltage Vop1 becomes the voltage V5 and rises to the voltage V6 by making the DC current of the current source 12 flow, the switch S4 is turned on, and the current of second half-wave resonance is made to flow by a resonance loop including a capacitor load, an inductor Ln, etc., to lower the voltage Vop1 to the voltage V1.SELECTED DRAWING: Figure 2

The invention discloses an on-site two-stage voltage control method and system based on optical storage integrated equipment, and belongs to the technical field of intelligent power distribution, and the method comprises the steps: obtaining the grid-connected point voltage and equipment operation parameters of the optical storage integrated equipment, calculating the reactive voltage sensitivity of the grid-connected point, and constructing a dynamic weight coefficient model; a dynamic reactive voltage droop curve slope is obtained, and a reactive voltage droop curve control function is optimized; according to the optimized reactive voltage droop curve control function and the fixed power factor control function, carrying out first-stage adjustment on the grid-connected point voltage; and if the voltage of the grid-connected point still exceeds the preset threshold value after the first-stage adjustment is performed on the voltage of the grid-connected point, performing active power reduction control, and performing second-stage adjustment on the voltage of the grid-connected point. The method can effectively solve the limitation of the light-storage integrated equipment in the aspect of reactive power regulation in the prior art, improves the efficiency and accuracy of voltage regulation of the power distribution network, and guarantees the safe and stable operation of a power system.

This invention discloses a control method and related components for an on-board charger, relating to the field of electric vehicles. When the on-board charger operates in V2L mode, the DC bus voltage of the on-board charger is acquired. To prevent the load from failing to start or stop normally due to excessively low DC bus voltage, when the DC bus voltage falls below a preset value, the AC output voltage of the on-board charger is actively reduced to a first AC output target voltage, thereby reducing the power demand of the load and allowing the on-board charger to maintain its output characteristics. After the AC output voltage of the on-board charger decreases and a preset derating time has elapsed, the DC bus voltage of the on-board charger gradually recovers. At this point, the AC output voltage of the on-board charger is then increased to a second AC output target voltage to ensure the normal power demand of the load.

An apparatus and method for efficiently routing power signals across a semiconductor die. In various implementations, an integrated circuit includes, at a first node that receives a power supply reference, a first micro through silicon via (TSV) that traverses through a silicon substrate layer to a backside metal layer. The integrated circuit includes, at a second node that receives the power supply reference, a second micro TSV that physically contacts at least one source region. The integrated circuit includes a first power rail that connects the first micro TSV to the second micro TSV. This power rail replaces contacts between the micro TSVs and a second power rail such as the frontside metal zero (M0) layer. Each of the first power rail, the second power rail, and the backside metal layer provides power connection redundancy that increases charge sharing, improves wafer yield, and reduces voltage droop.

The invention relates to power management based on limited hardware enforced power control. Various techniques and circuit implementations for power reduction management in integrated circuits are disclosed. Specifically, a power manager circuit in an integrated circuit (e.g., a system on chip) may modify a power budget for various components in the integrated circuit to reduce an amount of power control caused by external signaling indicative of a voltage regulator overload (e.g., a voltage drop).

The application provides an inverter droop control method and system, electronic equipment and a readable storage medium. The method comprises: generating an initial curve family of reactive power and voltage on the inverter side based on an established single-machine infinite bus (SMIB) model; screening the generated initial curve family according to a preset power system static stability criterion to obtain a stable region atlas capable of meeting the stable operation of the SMIB model; setting various different droop control curves in the stable region atlas; and determining a droop coefficient range based on the intersection between the droop control curves and the stable region atlas, and performing reactive power-voltage droop control based on the droop coefficient range. The application can accurately identify the stable domain of the reactive power-voltage droop coefficient of the network type inverter in advance and offline by constructing the SMIB model and coupling the inherent mathematical relationship and strict stability criterion.

The application provides a droop current-sharing control method and a control device for a high-power direct-current power supply system. The control method is to separately control each converter, and to take the high-frequency component of the output current of the converter obtained through sampling as a control quantity to participate in current-sharing droop. In a transient process, unbalanced current occurs. The high-frequency component amplitude of the converter with fast current surge and large amplitude is larger. Due to the transient droop control method, the reference quantity of the input voltage loop controller of the converter in the transient process is lower, so as to reduce the increase rate of the duty cycle. On the contrary, the high-frequency component amplitude of the converter with slow current surge and small amplitude is smaller. The transient voltage droop quantity of the converter is small, the reference quantity of the input voltage loop controller of the converter in the transient process is large, and the duty cycle is gradually increased, so as to achieve the purpose of balancing the current in the transient process.