84 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 invention discloses a converter grid following-grid construction control mode smooth switching method suitable for wide-range source-grid state change. The method comprises the following steps: constructing a phase-locked loop control loop, a power outer loop control loop and a current inner loop control loop of a grid following type converter based on constant power control; constructing a voltage control loop, a phase control loop and a voltage and current double-closed-loop control loop of the network construction type converter based on the virtual synchronous generator VSG; calculating real-time output active power P and reactive power Q of the converter; constructing a voltage phase synchronization loop switching control loop and a current instruction tracking loop, and realizing smooth switching of dq-axis current instruction values output by a power outer loop of a following network type and a voltage outer loop of a construction network type; and the output dq-axis current instruction value is transmitted to a current inner loop to generate a final voltage signal, and a PWM wave is output to the converter through a modulation link. According to the method, a voltage phase synchronous switching compensation mechanism is adopted, a voltage amplitude and a phase signal are synchronously corrected in the mode switching process, and smooth change of an inner ring current reference signal is achieved.

The invention relates to the technical field of network construction type converter control, in particular to a network construction type converter power outer loop dynamic control fault ride-through method and system, and the method comprises the steps: constructing a VSG active-frequency control loop and a VSG reactive-voltage control loop; constructing a VSG control-based network construction type converter control loop on the basis of the control loop; during a fault period, the VSG is converted from an active control priority mode to a reactive control priority mode, the VSG dynamically adjusts an active power instruction value and a reactive power instruction value, the active power of the network-forming converter is reduced, and the reactive power is increased; and dynamically adjusting the active droop coefficient according to the voltage drop degree of the power grid, and recovering the power system after the fault is removed. According to the method, the short-term stability of the system is maintained by reducing the active power instruction value during the fault period, and meanwhile, the active droop coefficient is dynamically adjusted, so that the transient recovery process of the VSG after the fault is removed is optimized, and the fault ride-through capability and the transient stability are improved.

The utility model provides a battery energy distribution unit, a battery pack and a vehicle, and relates to the technical field of new energy battery packs. According to the battery energy distribution unit, the shell with the mounting cavity is arranged, the control panel and the electronic device assembly are both arranged in the mounting cavity, the control panel is used for the battery management system to monitor the state parameters of the battery pack, and the control panel is further used for controlling opening and closing of the high-voltage electrical loop and the low-voltage electrical loop through the electronic device assembly. Meanwhile, the main positive relay and the fuse are connected through the connecting copper bar with the heat dissipation part, and the heat dissipation part faces the inner bottom wall of the mounting cavity and abuts against the inner bottom wall of the mounting cavity, so that heat dissipation is performed on the whole shell through the cold plate of the battery pack, which is equivalent to heat dissipation performed on the electronic component assembly through the heat dissipation part of the connecting copper bar; and the heat dissipation efficiency is improved, so that the heat dissipation performance of the battery energy distribution unit and the battery management system can be improved.

The invention relates to an inertia synchronization PMSG self-adaptive control method 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 power grid impedance, and determining the strength type of a power grid; s2, establishing a direct-drive fan grid-connected system control strategy, and adopting a power control ring, a current control ring and an inertia transmission control ring at a machine side; the grid side adopts a direct-current voltage synchronous loop, a reactive voltage control loop and a stabilization control loop; s3, linearizing the control equation, and based on a linearized small signal equation, obtaining a state variable of the direct-current voltage synchronous control grid-connected system of the grid-forming type direct-driven wind turbine generator; s4, calculating control parameters of a reactive voltage control loop and a direct-current voltage synchronous loop; and S5, carrying out adaptive parameter setting on an existing permanent magnet fan inertia synchronization strategy so as to adapt to the change of strong and weak power grids and improve the stability performance of the PMSG under different power grid short circuit ratios.

The invention discloses a wind power sending-out system control method and device and a wind power sending-out system, and relates to the technical field of wind power sending-out system control, and the method comprises the steps: obtaining an output current actual value and an output port voltage actual value of an MMC; the actual value of the output current is controlled by a current control loop; determining the virtual impedance of the MMC, and obtaining the voltage compensation amount according to the actual value of the output current and the virtual impedance of the MMC; according to the actual voltage value of the output port, the voltage reference value of the output port of the MMC and the voltage compensation amount, the voltage adjustment amount of the voltage control loop is obtained; wherein the voltage control loop and the current control loop form a voltage and current double-closed-loop control loop; and adjusting the operation parameters of the MMC according to the voltage adjustment amount. According to the invention, the control stability of the wind power sending-out system can be enhanced.

The invention discloses a network construction type converter fault current limiting method considering power angle stability, and belongs to the power electronic technology. According to the method, firstly, an active power adaptive adjustment coefficient is introduced into an active-frequency control loop, the power angle variation of the converter at the moment of a fault is suppressed, and the transient power angle stability of the converter is guaranteed; secondly, an output voltage reference value is adjusted through a reactive power-voltage control loop, the voltage difference between the converter and the power grid is reduced, and the current steady-state component in the fault period is restrained; and finally, a variable virtual reactance is introduced into a voltage outer ring, and a transient current impact component at the fault moment is suppressed. The current limiting method is provided for the grid-forming type converter when the grid-side voltage symmetrically drops, continuous increase of the output current in the converter fault period can be restrained, meanwhile, power angle instability is prevented, and the method has the advantages of being high in response speed, good in current limiting effect and high in power angle stability.

The application provides a kind of intelligent secondary voltage line selection device, it is installed in PT interface screen, and all voltage control circuits in measurement group and metering group are connected, also with each connected voltage control circuit on air switch are connected, including voltage acquisition module, outlet module and CPU module;Voltage acquisition module real-time acquisition all voltage control circuit on secondary voltage and upload;CPU module according to the secondary voltage of all voltage control circuit, determine the abnormality of petroleum voltage control circuit, if there is, then each abnormal voltage control circuit and its fault phase conversion control instruction is issued to outlet module;Outlet module according to control instruction, to each abnormal voltage control circuit on air switch are controlled, to shut off each abnormal voltage control circuit on fault phase output voltage.It can improve the scientific rationality of voltage control circuit access and use to avoid the protection misoperation caused by non-protection voltage accident and cause large area power failure.

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.

The invention relates to a secondary harmonic current suppression method based on a fractional filter, which can realize secondary harmonic current suppression by designing a control loop of a preceding-stage DC / DC converter, does not need to use additional devices, and greatly reduces hardware cost and system complexity. The fractional order band-pass filter with the adjustable order is used for replacing a traditional integer order replacement filter, and the dynamic response speed of the system is effectively improved. The fractional order notch filter is introduced into the voltage control loop, the stability margin of the system can be guaranteed by adjusting the order, and in addition, the second harmonic current suppression effect is further improved by adjusting the gain coefficient of the fractional order notch filter. The problem that the system stability is reduced and the second harmonic current suppression performance improvement effect is limited due to a traditional integer order notch filter is solved.

According to the SOC balance control and EIS test method based on the modular dual-output battery system, the circuit topology can carry out high-low voltage dual-output power supply at the same time, a multi-winding transformer is adopted, so that a plurality of batteries share one transformer, and the number of windings is reduced; besides, a control strategy of combining a voltage control loop and an SOC balance control loop is adopted, so that the SOC balance of the battery can be realized, and the output voltage can be accurately adjusted; a time division multiplexing strategy is utilized to carry out the EIS test of the battery on the premise that the normal charging and discharging of the battery and the SOC balance process are not interfered, and reliable data support is provided for the performance analysis of the battery.

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.

The invention relates to the technical field of power electronic power control, and discloses a double-closed-loop power control method and system based on positive current feedback, and the system comprises a positive current detection module, a negative current detection module, a voltage detection module, an inner loop controller, an outer loop controller, a PID controller, and a power conversion module. Through deep fusion of an inner-loop current control loop and an outer-loop voltage control loop, high-performance adjustment of a power system is realized, control robustness is improved, and control is performed by directly associating positive current of a power output end and taking the positive current as a feedback signal, so that a foundation is laid for subsequent power control, and the power control efficiency is improved. A PID control strategy and a PI control strategy are respectively adopted, so that the response speed and precision can be effectively improved, and the requirements of high-requirement scenes are met.

The invention discloses a power flow and voltage closed-loop control method and system based on a phase-shifting transformer, and the method comprises the steps: controlling the phase-shifting transformer to carry out the feedback closed-loop control of active power and reactive power, and obtaining a dq-axis instruction value of a voltage control loop; and winding switching partitions are divided according to the voltage compensation phasor diagram, and the switching position of the phase-shifting transformer winding is determined by combining a winding approaching switching strategy and the dq-axis instruction value. According to the invention, through partitioning of the PI controller and the voltage output vector, closed-loop control of the phase-shifting transformer on the line power flow is realized, and compared with a traditional control strategy, the method gets rid of dependence on line impedance and power grid parameters, and the calculated amount is small.

The invention relates to a pumped storage unit excitation control device and method with quick response, and belongs to the technical field of pumped storage unit control, and the method comprises the following steps: constructing an excitation control system based on a parallel structure of a main voltage control ring and a system voltage control ring; the main voltage control loop is formed by parallel PID controllers, and the system voltage control loop is formed by connecting system voltage control loop gain and two-stage lead-lag correction links in series. And a high-voltage side voltage deviation control signal input by the main voltage control ring is superposed with a machine terminal voltage deviation signal, and an excitation control signal is output after the superposed signals pass through a parallel PID (Proportion Integration Differentiation) controller. The voltage loop gain of the system is set according to 5%-10% of the reactive droop characteristic of the high-voltage side of the main transformer, reactive power distribution during parallel connection of the multiple pumped storage units is achieved, and reactive power fluctuation is avoided. And the dynamic quality of the system voltage loop is adjusted through the time constant of the two-stage lead-lag correction link. The system has the capability of quickly responding to the voltage change of the power grid, and can provide quick reactive power support and maintain the voltage stability.

The utility model provides a battery energy distribution unit, a battery pack and a vehicle, and relates to the technical field of new energy battery packs. According to the battery energy distribution unit, the shell with the mounting cavity is arranged, the control panel and the electronic device assembly are both arranged in the mounting cavity, the control panel is used for the battery management system to monitor the state parameters of the battery pack, and the control panel is further used for controlling opening and closing of the high-voltage electrical loop and the low-voltage electrical loop through the electronic device assembly. Meanwhile, the control panel is arranged at the bottom of the mounting cavity, the shell is connected with a cold plate of the new energy automobile, and the heat conduction piece is arranged, so that heat of the shell is conducted to the cold plate to dissipate heat of the shell, the cold plate of the battery pack is utilized to dissipate heat of the shell, and the heat dissipation efficiency is improved.

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.