53 results about "Voltage control loop" patented technology

The invention discloses a flexible control method and system for a bidirectional charging pile, and the method comprises the steps: collecting a physical port voltage and a loop current, calculating a voltage compensation amount through combining with an impedance compensation parameter, and generating a virtual feedback voltage for a voltage control loop; according to the working mode (charging / discharging) of the charging pile and the comparison result of the physical port voltage and the corresponding cut-off voltage threshold value, whether the system is in a safe area or a touch boundary is judged. In the safe area, the first type of correction is adopted to maintain the positive response characteristic; and when the boundary is touched, the second type of correction is adopted to limit the output and ensure that the port voltage does not exceed the preset threshold range. The method is used for improving the stability of the effective response duration and the adjustment precision when the bidirectional charging pile participates in the high-frequency power grid auxiliary service.

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 application relates to the technical field of motor control, and discloses a current dynamic coupling correction method for a permanent magnet synchronous motor of an electric drive axle system, which comprises the following steps: performing decoupling processing on three-phase current signals of the permanent magnet synchronous motor to obtain current components; performing real-time updating on a dynamic coupling coefficient on the basis of the current components and real-time monitored motor parameters and operating states of the permanent magnet synchronous motor to obtain a current dynamic coupling component; performing dynamic error monitoring analysis on the current dynamic coupling component to obtain a coupling disturbance estimation value; performing compensation response on the current components on the basis of the coupling disturbance estimation value and a preset feedforward compensation mechanism to obtain a current dynamic correction signal; performing correction superposition on the current dynamic correction signal on the basis of a voltage control loop of the permanent magnet synchronous motor to obtain a control voltage signal; and performing pulse width modulation on the control voltage signal to obtain an inverter control signal of the permanent magnet synchronous motor; and the application can improve the operating efficiency of the permanent magnet synchronous motor of the electric drive axle system.

This invention belongs to the field of high-voltage direct current (HVDC) transmission in power systems, specifically relating to a method, equipment, and medium for AC fault ride-through control at the sending end of a new energy source transmission system via a DRU-HVDC. When an AC fault occurs at the sending end, the grid-side converter of the new energy power station exits the active, reactive, and voltage loops, retains the inner current loop, and switches to maximum current output mode, locking the frequency to the rated value. Simultaneously, the receiving-end converter station exits the DC voltage outer loop, retains the inner current loop, and controls the DC current according to preset commands. During the fault duration, the diode rectifier station remains on and transmits maximum active power. After the fault is cleared, the output current of the new energy power station is reduced to the rated value, and then the power and voltage control loops are restored; the receiving-end converter station resumes constant DC voltage operation. This invention achieves maximum power control through preset commands. By controlling and switching between the new energy power station and the receiving-end converter station, the DRU is effectively maintained on, improving the active power transmission capacity and system recovery speed during faults.

This application relates to the field of new energy grid-connected power generation technology, and in particular to a design method for a voltage control loop of a grid-connected converter controlled by a virtual synchronous generator. In order to solve the problems and shortcomings of the existing technology in which the voltage control loop cannot take into account dynamics, stability and inaccurate estimation of the stable range, this application introduces stability constraints, active power dynamic performance constraints and reactive power dynamic performance constraints, reduces the interference of the voltage control loop on the power control loop, realizes the decoupling of the voltage control loop and the power control loop, and obtains the voltage control loop parameters through an algorithm without repeated trial and error.

The invention provides a control circuit and a control method for a pulse load power supply system, and the control circuit is used for being connected to a power supply main circuit comprising a pulse load, and specifically comprises a phase acquisition module, a signal conversion module, a linear expansion state observer, a voltage control loop, a current control loop, a signal inverse transformation module and a pulse width modulation module. The linear expansion state observer is used for observing load disturbance in real time and generating a load current feed-forward signal, the load current feed-forward signal and an initial current instruction output by the voltage control loop are synthesized in the first summator to form a compensated current instruction, and the compensated current instruction is transmitted to the current control loop; and finally converting into a switching signal for driving a converter in the power supply main circuit. The low-cost, high-performance and high-reliability suppression of the pulse load disturbance is realized.

A new architecture of an on-die process monitor circuit is described, without limitation, in 28 nm. The circuit can extract the threshold voltage, VTH, and random mismatch of a transistor using multiple extraction methods, such as but not limited to, the second derivative method. A sigma-delta modulator analog-to-digital converter may sample the output to enable on-die processing of the results. A VDS voltage control loop may be used to enable VTH extraction in both the linear and saturation regions of the device. The circuit may have a compact area of 5510 μm2.

This invention discloses a control method, control device, storage medium, computer program product, and refrigeration equipment for a PFC circuit, relating to the field of refrigeration equipment technology. First, the phase of the input voltage at the power input terminal is obtained; the rate of change of the input current is determined based on the correspondence between the input voltage phase and the input current phase at the power input terminal; then, based on the phase of the input voltage and the rate of change of the input current, the differential compensation gain value required to compensate the input current is determined; a PWM control signal is generated and output to the PFC switching device based on the differential compensation gain value to adjust the input current of the PFC circuit. The differential compensation gain value is used in PFC current detection. The detected PFC current and PFC voltage control loop generate a PWM wave through a specific software algorithm to control the switching of the IBGT device in the PFC circuit, so that the PFC input current waveform follows the input voltage waveform. This invention aims to improve the accuracy of PFC current detection, reduce harmonics and device heating during refrigeration equipment operation, and improve operating efficiency.

The application discloses a short-circuit ratio adaptive new energy station reactive power and voltage cooperative control method and system, belongs to the new energy power generation control technical field, and is particularly suitable for wind power cluster control under a weak power grid environment. The voltage and current responses of a grid-connected point are collected to estimate the short-circuit ratio of the grid-connected point in real time; the droop gain and filter parameters of a voltage control loop are dynamically adjusted based on the short-circuit ratio; at the reactive power distribution level, the reactive power distribution coefficient is calculated by combining the current operating condition of the new energy equipment through a dynamic weighting strategy of real-time available capacity, and a distribution dead zone is eliminated through a deviation iterative redistribution algorithm; the optimized reactive power reference value is converted into a local voltage correction amount, and the deep integration of station-level centralized scheduling and unit-level rapid response is realized. The application effectively solves the problems of response delay, voltage out-of-limit and subsynchronous oscillation of the traditional PQ control under a weak power grid, and significantly improves the low voltage ride-through capability and grid-connected stability of the new energy station.

The invention discloses an optical IO core particle-oriented quick response digital low-dropout voltage stabilizer, which comprises a voltage difference calculation logic unit used for calculating a voltage difference between an output voltage of a power tube and a reference voltage; the parameter generation logic is used for acquiring an optimal algorithm tuning parameter of the system according to the genetic algorithm; the feedback logic is used for generating feedback control quantity of the voltage control loop according to PID tuning of the voltage error quantity; the first summator is used for summing and generating the total feedback control quantity of the voltage control loop; the feed-forward logic is used for generating a feed-forward control quantity of the current control loop; and the second summator is used for summing the number of the power switches turned on at the current moment t, the total feedback control quantity and the feedforward control quantity to obtain the number of the power switches turned on at the next moment t + 1 so as to control the states of the power switches in the power tube. The invention aims to realize active compensation of load current fluctuation before significant voltage drop and realize excellent voltage regulation performance.

A multi-phase current mode hysteresis modulator implements phase current balancing among multiple power stages using a slope compensated analog phase current signal and an individual phase control signal for each phase. In some embodiments, the slope-compensated analog phase current signals for all phases are averaged and compared to the slope-compensated analog phase current signal for each phase to generate a phase current balance control signal for each phase. The phase current balancing control signal is combined with the voltage control loop error signal to generate a phase control signal for each phase, where the phase control signals are generated for a plurality of phases to control the phase current delivered by each power stage.

The invention discloses a control method of a multi-output branch power supply and related equipment. The method comprises the following steps: calculating a voltage control loop output value according to an output voltage sampling value and a reference voltage; calculating a feedback current limit value according to the current sampling value of each output branch, the branch maximum current limit value corresponding to each output branch and the total output current sampling value; determining a reference current according to the maximum total output current limit value, the voltage control loop output value and the feedback current limit value; and calculating a current control loop output value according to the reference current and the total output current sampling value so as to adjust the output voltage of the voltage source type power supply. According to the embodiment of the invention, through cooperative control of the voltage control loop and the current control loop, the maximum total output current and each output branch current are subjected to comprehensive current-limiting control while the stability of the output voltage is ensured. The method can be widely applied to the technical field of power supply control.

The invention relates to the technical field of power electronics and control, in particular to a voltage control method and device for a drilling winch super-capacity energy storage system based on improved LADRC, and the method comprises the following steps: building a mathematical model of the drilling winch super-capacity energy storage system; establishing an energy storage system model based on LADRC control; the method comprises the following steps: improving an LADRC controller in an energy storage system model based on LADRC control to obtain an improved LADRC controller; the improvement method comprises the following steps: adding output error feed-forward compensation in linear state error feedback LSEF and adding interference differential compensation in a disturbance observation loop of a linear extended state observer LESO; an improved LADRC controller is applied to a bidirectional DCDC voltage control loop of an energy storage system, and rapid and stable voltage regulation is realized through a double-closed-loop structure. According to the invention, the maximum utilization of feedback energy can be better realized, the dynamic performance of the system is improved, and the rapid and stable adjustment requirement of the bus voltage of the drilling winch system under multiple disturbances and multiple working conditions is met.

A multiphase current mode hysteretic modulator uses slope compensated analog phase current signals and individual phase control signals for each phase to achieve phase current balancing among multiple power stages. In some embodiments, the slope compensated analog phase current signals for all phases are averaged and compared to the slope compensated analog phase current signals for each phase to generate a phase current balancing control signal for each phase. The phase current balancing control signal is combined with a voltage control loop error signal to generate a phase control signal for each phase, where a phase control signal is generated for multiple phases to control the phase current delivered by each power stage.

This invention relates to hybrid energy control technology, aiming to provide a control method for a hydrogen fuel cell power system based on a multi-condition energy management strategy. It includes: constant power control for a unidirectional converter connected to the hydrogen fuel cell, using a PI controller to adjust the duty cycle to achieve power tracking of the hydrogen fuel cell output to a reference value; and dual closed-loop PI control (voltage and current) for a bidirectional converter connected to a battery, enabling the battery to respond to sudden changes in load power. The response bandwidth of the battery-side voltage control loop is at least 10 times that of the hydrogen fuel cell-side power control loop. This bandwidth separation ensures that the instantaneous power of the system is borne by the battery, while the steady-state power is provided by the hydrogen fuel cell. This invention can avoid the impact of load transients, stabilize the bus voltage, and maintain long-term stability within the high-efficiency operating range. It fundamentally solves the problem of frequent load changes in hydrogen fuel cells from a control perspective, improving operational economy and reliability.

The application provides a V-Q double-layer control method and system of a primary AC / AC converter, and relates to the technical field of voltage management. The primary AC / AC converter is adopted to directly realize AC-to-AC conversion, improve energy conversion efficiency and simplify the system structure. By introducing the V-Q double-layer control mechanism, the reactive power regulation and the output voltage regulation are managed through independent control loops. When the grid reactive power fluctuates, the reactive power control loop can quickly respond and adjust the AC capacitor voltage, and the voltage control loop can ensure the stability of the output voltage on the load side. The decoupled control strategy makes the voltage regulation more direct and flexible, especially in the case of weak grid or frequent load changes, which can provide more stable and reliable voltage support. Through the double-layer control, the problems of complex control, resonance risk and difficulty in simultaneously realizing efficient and flexible voltage regulation that may exist in the traditional SVG can be effectively avoided.

The invention provides a buck converter and an operation method thereof. The buck converter includes a power stage, a feedback network, a control loop, a logic circuit, a driver circuit, and a bypass detector. The power stage comprises an input end and an output end. The feedback network is coupled to the power stage for generating a feedback voltage according to the output voltage. The control loop comprises an error amplifier and a comparator. The error amplifier is used for generating an error voltage by comparing a reference voltage with a feedback voltage, and the comparator is coupled to the error amplifier and is used for generating a comparator signal according to the error voltage. The logic circuit is used for generating a logic control signal according to a group of control signals to realize a control scheme. The driving circuit is used for driving the power stage according to the logic control signal. The bypass detector is used for comparing the input voltage with a preset threshold value and correspondingly generating a bypass mode signal.

The invention discloses a power oscillation suppression method for a grid-forming type energy storage converter parallel system, and belongs to the field of micro-grid power utilization. Acquiring a three-phase output voltage and a three-phase current; calculating instantaneous active power and reactive power by using the three-phase voltage and the three-phase current, and constructing an active power control loop and a reactive power control loop; calculating an active damping compensation amount; angular frequency required by the system and a system phase damping an oscillation component in the active power are calculated; calculating a reactive power damping compensation amount; calculating a reference voltage amplitude required by the system and damping an oscillation component in reactive power; a three-phase voltage, a three-phase current, a system phase damping an oscillation component in active power and a reference voltage amplitude damping an oscillation component in reactive power are sent to a voltage control loop and a current control loop to generate a modulation signal and convert the modulation signal into a control signal, and the control signal acts on a converter so as to suppress oscillation. Damping compensation branches are designed from an active control loop and a reactive control loop, system damping is greatly increased, and the interactive oscillation phenomenon of the grid-forming type energy storage converter parallel system can be effectively restrained.

An example apparatus for controlling one or more inverters is provided herein. In some embodiments, the apparatus for controlling one or more inverters may include one or more controllers. In some embodiments, each of the one or more inverters is associated with at least one power source. In some embodiments, each of the one or more controllers may configured to provide droop control, voltage magnitude control, phase control, frequency control and inertia control for an associated inverter of the one or more inverters. In some embodiments, each of the one or more controllers comprises a voltage control loop, a virtual inertia control loop, and a droop control loop enabling the power supplies to sync with a power grid and / or other power supplies when the power supply is disconnected from the power grid and / or other power supplies and / or connected to a power supply to the power grid and / or other power supplies.

The invention discloses a permanent magnet synchronous motor field-weakening control method based on power regulation, and relates to the technical field of motor field-weakening control. The method comprises the following steps: acquiring three-phase current and performing coordinate system conversion; acquiring an actual rotating speed based on motor rotor position information; establishing a power-current mapping relation; constructing an active power ring and a reactive power ring; starting of a reactive power loop is controlled through a threshold range, alpha-beta-axis current reference given is calculated, dq-axis current reference given is obtained through conversion, and the permanent magnet synchronous motor is driven to operate through current loop control and PWM wave generation. A current reference track is obtained through a power mapping relation, a traditional voltage control loop is omitted, a PI controller is adopted to construct a power control loop, good compatibility and execution efficiency are achieved, and field weakening and position-free cooperative operation can be achieved.

The invention discloses a frequency-voltage-power coupling controller suitable for new energy power generation equipment, belongs to the field of frequency modulation and voltage regulation control of a power system, and aims to couple a voltage control loop and a frequency control loop based on an active power and reactive power coupling phenomenon and traditional double closed-loop control in a novel power system. On-off of a voltage control loop and a frequency control loop is controlled by changing reference values of active power and reactive power, and four control modes including a frequency-active power control mode, a frequency-reactive power control mode, a voltage-active power control mode and a voltage-reactive power control mode are formed. The frequency-voltage-active power coupling control and the frequency-voltage-reactive power coupling control are realized, so that the frequency and voltage deviation is reduced, the effect of frequency and voltage response collaborative optimization is achieved, the dynamic response of the power system is improved, and the dynamic performance and the operation stability of the power system are remarkably improved.

The invention discloses a transient state control method and device for a network construction type converter and a medium, and is applied to the technical field of network construction type control. The method comprises the following steps: acquiring a grid-side current, a grid-connected current and a grid-connected voltage output by a grid-forming converter; injecting the grid-connected voltage, the grid-connected current, the grid-side current and the current amplitude limiting value into a power outer loop control loop to determine a corresponding voltage reference value and a voltage phase angle; under the condition of a power grid fault, on the basis of the voltage phase angle and under the condition that the grid-side current meets the current limiting condition, the grid-side current, the current amplitude limiting value, the grid-connected voltage, the voltage phase angle and the voltage reference value are injected into a cross feedback voltage control loop, so that the cross feedback voltage control loop carries out amplitude limiting correction on the grid-side current; and executing transient stability control according to the grid-side current after amplitude limiting correction and the voltage phase angle. The method has good stability, can maintain the network construction characteristic in the amplitude limiting process, reduces the fault current to a safety level in a short time, and is simple in mode.

The application provides a control system of a laser pumping source constant current driver and a DSP digital processing chip, the control system of the laser pumping source constant current driver is realized based on the DSP digital processing chip, a control loop capable of generating and outputting a driving PWM signal is arranged in the DSP digital processing chip, a closed-loop, digitally designed voltage control loop and a current control loop are arranged in the control loop, and the voltage control loop and the current control loop alternatively output driving control PWM signals. The application has the beneficial effects that the rising and falling edge time of the output current is faster, the current dynamic overshoot is lower, and the device output is stable and free of oscillation.

The invention discloses a bidirectional DC converter energy control method and device and a vehicle and ship power supply control method, and the method comprises the steps: sampling a first side port voltage, a second side port voltage and a current of a bidirectional DC converter in real time, and combining the first side port voltage, the second side port voltage and the current through a voltage control loop algorithm to generate a PWM signal; when the voltage of the first side port is higher than the voltage stabilization threshold value, the generated PWM signal controls the bidirectional DC converter to act to realize controllable forward transmission of energy from the first side to the second side, and the voltage of the first side port approaches the voltage stabilization threshold value by dynamically adjusting the transmission power; and when the voltage of the first side port is lower than the voltage stabilization threshold value, the generated PWM signal controls the bidirectional DC converter to realize controllable reverse transmission of energy from the second side to the first side. According to the invention, controllable energy transmission between the first side and the second side is realized, stable port voltage and reliable system response are ensured, and the complexity of software and hardware is reduced.

The application relates to an adaptive control method of inertia synchronization PMSG based on online impedance estimation, and belongs to the field of new energy grid connection. The method comprises the following steps: S1, constructing an RLS-GA hybrid strategy algorithm to quickly and accurately identify the grid impedance, and determining the strong and weak types of the grid; S2, establishing a direct-drive wind turbine grid connection system control strategy, adopting a power control loop, a current control loop and an inertia transmission control loop on the generator side; adopting a direct-current voltage synchronization loop, a reactive voltage control loop and a stabilizing control loop on the grid side; S3, linearizing the control equation, and obtaining the state variables of the direct-current voltage synchronization control grid connection system of the grid-connected direct-drive wind turbine generator set based on the linearized small signal equation; S4, calculating the control parameters of the reactive voltage control loop and the direct-current voltage synchronization loop; and S5, adaptively setting the parameters of the existing permanent magnet wind turbine inertia synchronization strategy, so that the change of the strong and weak grid is adapted, and the stability performance of the PMSG under different grid short-circuit ratios is improved.

The present disclosure provides an electric vehicle fast charging boost circuit and a control method thereof, and relates to the technical field of electric vehicle battery management, which comprises an electric vehicle fast charging socket, a power battery, a boost device and a rear electric drive high-voltage control loop; when the electric vehicle fast charging socket and the fast charging pile enter the interaction stage, the vehicle end BMS identifies the output voltage range of the fast charging pile; if the maximum output voltage of the fast charging pile is higher than the highest voltage of the vehicle power battery, the BMS controls the battery fast charging positive relay, the boost device fast charging positive relay and the boost device fast charging negative relay to be closed, and enters the direct charging mode; if the maximum output voltage is lower than the highest voltage of the vehicle power battery, the BMS controls the battery fast charging positive relay, the boost device boost positive relay and the boost device boost negative relay to be closed, and cooperates with the rear electric drive high-voltage control loop to control, and enters the boost charging mode. The present disclosure can be compatible with low-voltage fast charging piles, improve the charging power and charging efficiency, and reduce the heat generation and energy loss of the fast charging battery.

The utility model discloses a charging control circuit. The charging control circuit comprises an output module, a voltage control loop, a current control loop and a control module. The control module is coupled with the output module and is configured to receive the output current and the output voltage of the output module; the first input end of the voltage control loop is used for receiving the power supply voltage of the output module, and the second input end is coupled with the first output pin of the control module; the first input end of the current control loop is coupled to the second output pin of the control module, the second input end of the current control loop is coupled to the third output pin of the control module, and the control module is configured to provide a value representing the output current to the first input end of the current control loop; wherein the control module is used for reducing the value at the second input end of the voltage control loop and / or increasing the value at the first input end of the current control loop. The charging control circuit provided by the utility model can be prevented from being damaged by hot plug operation.

The invention relates to an output impedance modeling method and device suitable for a network construction type new energy converter and a storage medium, a multi-frequency voltage disturbance signal is injected into a converter grid-connected point, the multi-frequency voltage disturbance signal comprises at least one positive sequence frequency component and one negative sequence frequency component, modeling is carried out based on a two-phase static coordinate system and a two-phase rotating coordinate system, and the output impedance is obtained. Representing the voltage and current of the grid-connected point of the converter as time-domain complex vector signals, and sequentially performing power calculation, power tracking control loop modeling, voltage control loop modeling and current control loop modeling to obtain complex vector expression of PWM control reference voltage; a PWM control reference voltage is associated with a PWM bridge arm output voltage, an equation is established, and an output impedance matrix of the converter is obtained and comprises positive sequence self-impedance, negative sequence self-impedance, positive-negative sequence mutual impedance and negative-positive sequence mutual impedance; the invention discloses a method-based implementation device and a storage medium. According to the invention, rapid modeling and impedance verification can be realized for converters with different control parameters.

A single-stage series resonant converter includes an AC / DC converter circuit and a DC / DC converter circuit. The AC / DC converter circuit rectifies alternating current into direct current and outputs it to the DC / DC converter circuit. The converter also includes a control circuit that integrates a charge control method. The charge control method includes step P1, a voltage control loop, which samples the voltage V of the DC / DC converter circuit. o , and voltage reference value V ref After subtraction, an adjustment operation is performed to obtain the threshold Δv. Cr Step P2 corrects the threshold, K f f is a correction coefficient constant. s V is the switching frequency. in This refers to the voltage value at the input terminal of the DC / DC converter circuit. The input current of the AC / DC converter circuit of this invention linearly follows its input voltage, achieving the optimal power factor.

The application provides a power supply device and a control method thereof. The power supply device comprises a mode selection module for a user to select an output mode; a reference value setting module for outputting an output voltage reference value and an output current reference value according to the output mode selected by the user; a current control loop and a voltage control loop which respectively receive the output current reference value and the output voltage reference value and respectively output a first electric signal and a second electric signal; a loop selection module for transmitting the first electric signal or the second electric signal to a driving module; and the driving module for providing a driving signal to a main power module for controlling the main power module to output a constant voltage or a constant current and to perform voltage limiting protection or current limiting protection when the output voltage or the output current is greater than or equal to an over-power protection voltage or an over-power protection current, so that the working mode of the switching power supply can be changed according to the load condition and over-power protection can be performed on the switching power supply.