410 results about "Voltage loop" patented technology

The invention provides a fault ride-through control method and a fault ride-through control system for a grid-forming converter, which are characterized in that the current of the grid-forming converter under an asymmetric fault is controlled by adopting a negative-sequence current reference generation strategy aiming at an inner ring of a controller, and negative-sequence reactive current is injected into a power grid; adopting a partial sequence current amplitude limiting strategy to control the maximum phase current amplitude of the injected asymmetric current not to exceed an amplitude limiting value; controlling the boundary of an active reference value by adopting an active reference value amplitude limiting strategy for an active synchronization ring; a synchronous damping link is adopted to enhance damping in power angle swing; for a reactive voltage loop, a reactive voltage variable coefficient control strategy is adopted to control the output of the maximum reactive current; and an internal potential locking strategy is adopted to suppress overvoltage. According to the invention, negative-sequence reactive power is provided, and overcurrent of each phase is avoided; the power angle characteristic is improved, and the transient stability is improved; stable transient voltage support is provided in a current output capability range; and after the fault is recovered, the voltage of the converter grid-connected point is smoothly recovered.

The invention relates to the technical field of new energy power system control, and relates to a power decoupling method for cooperative control of voltage feed-forward compensation and adaptive virtual impedance. The method comprises the following steps: acquiring a power grid current and a power grid voltage, and calculating a reactive power measured value and an active power measured value of a power grid; virtual synchronous machine control is carried out, and a voltage feed-forward pre-compensation item is introduced into a reactive power control loop; calculating a reactive power control loop after VSG compensation, and obtaining VSG output side voltage and instantaneous angular frequency; self-adaptive virtual impedance control is adopted, a self-adaptive virtual impedance reference value is calculated, line impedance is dynamically adjusted, and a voltage loop input instruction voltage is calculated according to the line impedance; and adjusting the output performance of the inverter according to the instruction voltage. According to the invention, the problem of power fluctuation caused by VSG output voltage amplitude variation is effectively solved, and the dynamic influence of a power coupling item is weakened.

The invention discloses a buck-boost circuit-based mppt charging current backflow prevention control method, and relates to the technical field of switching power supplies, and the method comprises the steps: collecting a photovoltaic input voltage, a battery output voltage, and an inductive current flowing through an inductor; the current input power is calculated based on the photovoltaic input voltage and the inductive current, and the reference voltage is dynamically adjusted through an MPPT loop algorithm; pI voltage loop operation is carried out on the output voltage and the adjusted reference voltage, and expected charging current is generated; pI current loop operation is carried out on the expected charging current and the inductive current sampling value after proportionality coefficient adjustment, and a PWM duty ratio control signal is output to adjust the driving states of the four switching tubes; when the judgment circuit is in an intermittent conduction mode and meets critical conditions, a driving signal of the fourth switching tube is shielded, and only a body diode realizes a current path to prevent reverse flow of current; the battery current is effectively prevented from flowing backwards, and the system safety and the energy utilization efficiency are improved.

The invention discloses a VSG damping enhancement control method based on active lead-lag compensation, and belongs to the field of new energy converter technology control. The method comprises the steps of firstly sampling output voltage and current of a new energy converter, calculating output instantaneous active power and reactive power of a virtual synchronous generator through the sampled voltage and current, and then obtaining an output phase instruction value and a voltage control instruction value through an optimized active-frequency loop and an optimized reactive-voltage loop; and finally, through voltage and current double-closed-loop control, the control of the new energy converter is realized. According to the method, the system damping ratio is increased in the transient process through the control method that the active power is fed back to the forward channel after lead-lag compensation, overshoot and oscillation generated when the active power output by the system changes are effectively restrained, tiny overshoot which cannot be restrained cannot be generated, and when the power grid angular frequency breaks away from the rated value, the system damping ratio is increased. And the steady-state characteristics of the system are not influenced.

The invention belongs to the technical field of new energy, and particularly relates to a fault voltage ride-through optimization method and system for a network construction type energy storage converter. Carrying out positive and negative sequence separation and Clark-Park coordinate transformation on the three-phase power grid voltage and the inversion current, calculating active power and reactive power of the network-forming type energy storage converter, and carrying out power loop control to obtain three-phase reference voltage and angular velocity; performing voltage loop control, and dynamically adjusting a positive sequence active current and a positive sequence reactive current according to whether a low-voltage-crossing indication signal exists or not; performing positive-sequence current loop control and negative-sequence current loop control, and then performing inverse Clark-park conversion to obtain positive-sequence three-phase reference voltage and negative-sequence three-phase reference voltage; and superposing the positive-sequence three-phase reference voltage and the negative-sequence three-phase reference voltage for PWM (Pulse Width Modulation). According to the invention, when the power grid voltage is unbalanced due to a fault, the oscillation of the direct current side voltage and power caused by the negative sequence component is eliminated, and the power angle stability is improved and the fault current is suppressed by dynamically adjusting the related reference value during the fault voltage ride-through period.

The invention provides a network construction control method and system for a static var generator without a super capacitor, and the method comprises the steps: obtaining a variable needed by the control of the static var generator, comprise a three-phase bridge arm voltage measurement value, a three-phase bridge arm voltage instruction value, a reactive power instruction value, an alternating voltage amplitude instruction value, an output reactive power measurement value, an output alternating current measurement value, an alternating voltage amplitude measurement value of a common coupling point, a direct-axis voltage measurement value and a quadrature-axis voltage measurement value; obtaining a three-phase modulation voltage through a voltage loop and an alternating current loop according to variables required by control and based on direct current voltage-frequency-phase control and reactive power-voltage droop control; and obtaining a switch tube control signal according to the three-phase modulation voltage, and completing network construction control of the static var generator according to the switch tube control signal. According to the invention, the stability of the DC voltage of the static var generator can be ensured without adding a super capacitor, and active support is provided for an AC side power grid.

The utility model relates to a power supply device and a testing machine, the power supply device comprises a main loop, a voltage loop, a current loop and a clamping circuit, in a pressurization mode, when a detection current output by the clamping circuit at the current loop is in a set current clamping range, the output impedance is high resistance; and when the detection current output by the current loop is not in a set current clamping range, the clamping circuit triggers the clamping current to carry out analog output, and the output impedance is switched to low resistance, so that the output of the main loop is equivalent to a constant current source. In the current adding mode, when the detection voltage output by the clamping circuit at the voltage loop is within a set voltage clamping range, the output impedance is high resistance; and when the detection voltage output by the voltage loop is not in a set voltage clamping range, the clamping circuit triggers the clamping voltage to perform analog output, and the output impedance is switched to low resistance, so that the output of the main loop is equivalent to a constant voltage source. The simulation regulation function is achieved, and the response speed is high.

The invention provides a stability analysis method and system for a tracking and networking inverter hybrid system and a medium, and the method comprises the steps: selecting the active power of a tracking inverter and the reactive power of a networking inverter as core variables through working condition variable dimensionality reduction; determining a working condition range in combination with capacity constraint, performing discretization processing, and calculating dq components of voltage and current of an inverter port based on a discrete working condition; discrete impedance models of the two types of inverters are respectively constructed; the influence of a phase-locked loop controller, a current loop controller and a power loop controller is considered in a following network type, and the effect of a virtual synchronous controller, a current loop controller and a voltage loop controller is included in a construction network type; and calculating a closed-loop transfer admittance matrix of the power grid through the discretized impedance of the inverter to realize stability analysis of the hybrid system. According to the method, the modeling complexity is effectively reduced, the stable working areas of the system under different working conditions can be quantified, and an accurate reference basis is provided for stable operation of the hybrid inverter system.

The invention discloses a multiphase BUCK converter and a high-dynamic self-adaptive phase cutting method. The multiphase BUCK converter comprises a 16-phase power level, a current sampling module, an MOS driving module, a digital control module, a CMCOT simulation main control loop and a dynamic detection circuit. The MOS driving module controls a switching tube in the 16-phase power level, the current sampling module collects an inductive current signal, the input end of the CMCOT simulation main control loop is connected with the output end of the current sampling module, and a PWM control signal is output to the digital control module; the input end of the dynamic detection circuit is connected with an output signal of a voltage loop gain in the CMCOT analog main control loop, and a mark signal is generated and output to the digital control module; the digital control module generates a phase cutting signal. A phase cutting strategy is correspondingly provided, the number of PWM started by a phase cutting signal is adaptively changed, the transient voltage undershoot is reduced, meanwhile, voltage overregulation is avoided, and the transient performance is remarkably improved.

The invention provides a network construction type converter control method suitable for multiple power grid intensities, and belongs to the field of new energy grid-connected stability. The method comprises the steps that the actual output power of an inverter is calculated according to inverter side capacitor voltage and grid-connected current; the actual output power of the inverter and the power reference value control an output internal potential amplitude reference value and an internal potential phase angle through the virtual synchronous generator; subtracting the voltage drop of the grid-connected current on the virtual impedance from the internal potential amplitude reference value to obtain a virtual internal potential; inputting the virtual internal potential as a reference voltage into a voltage and current double-loop controller, inputting a grid-connected current into a proportional differential controller, subtracting the output of the proportional differential controller from the output of the voltage and current double-loop controller, inputting an obtained result into an inverter through an SPWM modulator, and controlling the inverter; the invention also provides a control system of the network-forming converter. Grid-connected current proportional differential feedback is introduced, the inner loop control bandwidth is kept constant in the dynamic change process of the power grid strength, and power-voltage loop harmful coupling is eliminated.

The invention belongs to the technical field of mathematical modeling of a network construction converter, and discloses a network construction converter model order reduction method, system and equipment based on optimal Hankel norm approximation and a medium, so as to solve the problem of applicability of a network construction converter model under the condition of a high short circuit ratio. The method is based on a full-order model and comprises the steps of S1, current loop order reduction processing, S2, voltage loop Hankel approximation order reduction and S3, construction of a nine-order model. According to the method, through dq decoupling, feedforward offset and optimal Hankel norm approximation, a full-order system is reduced into a nine-order model, and the calculation complexity is greatly reduced while the control precision is ensured. According to the method, active and reactive high-frequency component quantity links filtered by a filter and a line resistance-inductance equation are considered, the nine-order model of the network construction converter is constructed, and the model precision is effectively improved.

The invention relates to the technical field of switching power supply analog control, in particular to a control method and system for a small-duty-ratio BOOST module based on digital control, and the method comprises the following steps: S1, carrying out the sampling of the equal-proportion reduced output voltage of an operational amplifier through an ADC analog-to-digital converter, processing the sampled voltage value through a filtering algorithm to obtain an output voltage VO; and S2, carrying out calculation processing on the output voltage VO through a PID control algorithm, and obtaining an expected output voltage through a fixed-frequency adjustment duty ratio PWM and a fixed-duty ratio frequency modulation PFM. Efficient and stable voltage boosting is achieved through double-closed-loop digital control, dynamic response and anti-interference capacity are achieved, the core lies in collaborative design of power conversion and a control strategy, input direct-current voltage is boosted to higher stable output voltage, a double-closed-loop (voltage loop + current loop) control strategy is adopted, and the voltage boosting effect is achieved. And closed-loop adjustment is realized by combining PWM driving and ADC sampling.

The invention discloses a method and device for measuring the resistance value of a crimping tube contact resistor and a test loop for measuring the resistance value of the crimping tube contact resistor, and belongs to the field of cables. The method comprises the following steps: acquiring the total number of crimping pipes in a test loop, the first length of a reference cable, the reference temperature of a conductor in the reference cable and the total length of the cable except the length of the crimping pipes in the test loop; when the power frequency current enters the test loop and the real-time temperature of the reference cable reaches the reference temperature, acquiring the loop voltage and loop current of the test loop and the voltages at the two ends of the reference cable; according to the loop voltage, the loop current, the two-end voltage, the first length and the total length of the cable, the total contact resistance value of the test loop is calculated; and determining the contact resistance value of each crimping tube in the test loop according to the total number of the crimping tubes and the total contact resistance value. By implementing the application, the problem that the contact resistance cannot be effectively measured in the prior art can be solved.

An automatic current sharing control method for an interleaved BUCK converter belongs to the technical field of power electronics, and comprises the following steps: step S1, obtaining an output voltage and a given output voltage of a load end of the interleaved BUCK converter; obtaining the current of each phase of inductor; s2, obtaining an average value of the inductive current of each phase, and averaging the average value of the inductive current of each phase as a reference value of a current loop; s3, calculating a duty ratio signal through a current loop; s4, calculating a duty ratio signal through a voltage loop; and S5, superposing the duty ratio signal of the current loop operation of each phase with the duty ratio signal of the voltage loop operation. According to the invention, the inductive current of each phase follows the average inductive current of three phases in real time, high-precision current-sharing control is realized, and the control reliability is improved, so that the output current is controlled at an average level.

The invention belongs to the technical field of power electronics, and provides a nonlinear robust control method and device for a DC-DC converter. The method comprises the following steps: acquiring an output voltage of the DC-DC converter and feeding back the output voltage to a terminal sliding mode controller, calculating a voltage error between a reference voltage and the output voltage of the DC-DC converter by the terminal sliding mode controller, and calculating the voltage error of the DC-DC converter according to a relation among a preset fractional order nonlinear sliding mode surface, a linear sliding mode surface and the voltage error, generating a first control signal as a reference current of the linear controller to form a voltage loop; and the output current of the DC-DC converter is obtained and fed back to the linear controller, the linear controller generates a second control signal in combination with the reference current and acts on a set power switch tube of the DC-DC converter to form a current loop, and finally DC-DC converter double-loop nonlinear robust control based on cooperation of the reference voltage, the output voltage and the output current is achieved. And good transient response is ensured.

The invention discloses a power current loop control method for seamless switching of grid-connected and off-grid modes of an energy storage PCS, and the method achieves the seamless switching of the two control modes through the dynamic adjustment of a power reference value of an inverter, the merging of a PQ-controlled current loop and a Vf-controlled current loop, and the introduction of a PQ-controlled reference current into a Vf control loop. The method specifically comprises the following steps: detecting voltage, current and phase parameters in grid-connected and off-grid states, and calculating corresponding power; when the switching signal is received, the grid-connected active power is adjusted to an off-grid preset value through a PI controller; switching an inverter control mode within a power error allowable range, and introducing a PQ reference current to a Vf voltage loop; and control mode switching and switch state change are completed in sequence. According to the method, the problems of voltage fluctuation and current sudden change during switching in a traditional method are effectively solved, bidirectional seamless switching can be realized without reducing zero output power, dependence on an additional energy storage system is reduced, and the operation stability of the micro-grid is improved.

The invention discloses a fault current calculation method and system for a high-voltage alternating-current submarine cable grounding system and a storage medium, and the method comprises the following steps: enabling a power supply device and an electric device to be equivalent to an impedance and series voltage source combination and a load impedance based on the Thevenin equivalence theorem; in combination with the double-end grounding characteristic, a submarine cable loop is equivalent according to a pi type, and a three-phase equivalent circuit is constructed; determining a fault phase, and dividing the submarine cable as a left side and a right side by a fault point; a voltage loop equation is listed based on the Kirchhoff theorem, and a matrix recursion rule is deduced in combination with a double-side elimination principle. And establishing an analytic relationship between the main sections of the submarine cables at the power side and the short-circuit side and the fault circulating current according to a recursion rule. And with a fault point current equation as a boundary condition, left sheath fault circulation distribution is solved simultaneously. And repeating the steps on the right side to obtain right side distribution so as to obtain fault phase whole-line distribution. According to the method, the circulation distribution can be accurately calculated, the fault analysis accuracy and efficiency are improved, and support is provided for submarine cable operation and maintenance and the like.

The invention provides a consistent and stable operation control method for a net-forming type flywheel energy storage array, and relates to the technical field of flywheel energy storage. Comprising a distributed power distribution strategy based on a ratio consistency algorithm and a flywheel energy storage array control strategy based on'voltage-rotating speed-current 'three closed loops. For rotating speed control, the problems of energy-saving voltage stabilization, SOC management, flywheel unit rotating speed balance and the like do not need to be considered, only the rotating speed loop needs to be connected between the voltage loop and the current loop in series, and the structure is simpler. In terms of power distribution, the strategy does not depend on a central controller or a leader unit, each flywheel unit only needs to exchange information with the adjacent unit to complete power distribution, the reliability of the flywheel energy storage array is improved, and the robustness is good.

The invention relates to an improved network construction type energy storage converter control method and system, and the method comprises the following steps: constructing a conventional network construction type control framework containing P-f and Q-U control rings, and obtaining a basic control model; virtual impedance control including a virtual resistor Rv and a virtual inductor Lv is added in a voltage loop, and a primary improved control model is formed; then virtual capacitive reactance control of a virtual capacitor Cv is added in a current loop, and a final improved control model is obtained; and finally, controlling the converter through the model to realize stable support of the voltage and frequency of the power grid. Through cooperative improvement of voltage loop virtual impedance and current loop virtual capacitive reactance, the method and system can effectively improve the stability and robustness of the converter in a weak power grid environment, enhance the power grid supporting capability, solve the problem of easy instability caused by multi-loop coupling in traditional control, enable the converter to be closer to the external characteristics of a traditional synchronous generator, and improve the stability of the converter in a weak power grid environment. And the requirements of a new energy high-permeability power system are met.

The invention discloses a dual-frequency positive-sequence impedance modeling method for a network-building type energy storage converter considering frequency coupling. The method comprises the following steps: 1, injecting a dual-frequency positive-sequence disturbance voltage signal at a grid-connected point of the network-building type energy storage converter based on a virtual synchronous machine; 2, establishing a linearized small signal model for each control link of an active-frequency loop, a reactive-voltage loop, a virtual impedance-containing voltage and current double closed loop and the like to form a multi-frequency signal model; and 3, according to the multi-frequency coupling relationship between the current and the voltage, constructing a frequency coupling impedance matrix, and reducing a coupling term into output impedance to obtain the positive sequence output impedance and the negative sequence output impedance of the converter considering the frequency coupling, thereby simplifying the model stability analysis. According to the method, dual-frequency positive sequence disturbance is introduced, the coupling effect between different frequency components is effectively described, the defect that a traditional single-frequency modeling method cannot reflect the multi-frequency interaction characteristic is overcome, and the accuracy and applicability of the impedance model of the network construction type energy storage converter under the multi-frequency disturbance scene are remarkably improved.

The invention discloses a pre-synchronization control method and system for a grid-following type energy storage converter based on phase angle compensation, and the method comprises the steps: controlling the voltage amplitude and frequency of an energy storage converter side to be consistent with those of a power grid side through a control module when the energy storage converter is off-grid; measuring the phase angles of the energy storage variable current and the two sides of the power grid through a measurement module; generating a phase angle compensation amount based on the phase angles on the two sides through a calculation module, synthesizing a three-phase voltage reference value based on the amplitude and frequency of the voltage on the power grid side and the phase angle compensation amount, and performing coordinate transformation on the three-phase voltage reference value to obtain a voltage loop reference value; through a compensation module, based on a voltage loop reference value, a grid-connected point phase angle is adjusted through double-closed-loop control and current-limiting protection; and monitoring electrical values of the converter side and the power grid side through a monitoring module so as to judge and switch grid-connected conditions. According to the invention, long-time waiting under a small frequency difference is avoided, the frequency is kept relatively stable, and frequency hopping and voltage / current impact risks caused by large frequency difference adjustment are eliminated.

The invention discloses a bidirectional DC-DC double-voltage loop control method, system, medium and equipment, and relates to the technical field of electric power, and the method comprises the steps: collecting the voltage and current of an input side and an output side of a switch module, and transmitting the voltage and current to a control module; respectively calculating voltage errors based on the acquired input side and output side voltages; establishing a voltage arbitration mechanism, comparing the voltage error of the input side voltage loop with the voltage error of the output side voltage loop, and selecting a voltage loop corresponding to a smaller voltage error value as a target voltage loop; determining a proportionality coefficient and an integral coefficient of a target voltage loop, and taking a current given value of the target voltage loop as an input target value of a current loop; and the duty ratio is calculated through the current loop, the duty ratio signal after amplitude limiting is output to the switch module, and each switch device is adjusted. The target voltage loop is dynamically selected through a voltage arbitration mechanism, voltage fluctuation in the battery charging and discharging process can be handled, the risk of single-side voltage is avoided, and the voltage control precision and stability of the system are remarkably improved.

The invention discloses a method and a device for improving dynamic characteristics of a two-stage resonant converter based on a virtual resistor, and in the converter, a front-stage Buck converter and a rear-stage LLC resonant converter are connected through a common DC bus; the dynamic characteristic improvement method comprises the following steps: inputting bus capacitor voltage on a common direct current bus into an active damping inner ring controller, and simulating a virtual resistor accessed to a converter through output; the difference value between the output voltage of the resonant converter and the reference voltage is input into a voltage outer loop proportional-integral controller; and subtracting the output signals of the active damping controller and the voltage outer loop controller to obtain an improved duty ratio of the preceding-stage Buck converter for controlling a switching device. By adopting the above technical scheme, through a control mode of combining voltage outer loop control and active damping inner loop control, the double-resonance peak in the voltage loop is suppressed, and the bandwidth of the voltage loop is effectively expanded.

The invention relates to a new energy grid-connected control technology, in particular to a grid-following type and grid-constructing type dual-mode switching control method and system for a voltage source converter, and the method comprises the steps: building an electrical topology and mathematical model of a grid-connected system, including modeling a main circuit under a synchronous dq coordinate system with a PCC voltage phase angle as a reference, obtaining active P and reactive Q expressions injected into the power grid; under the control of the following network type GFL, a PLL unit, a power outer ring and a current inner ring are adopted to realize synchronization and active / reactive injection control; under the control of the network construction type GFM, a power synchronous ring, an excitation ring, a voltage ring and a current ring are adopted to form network construction control; in the switching process, the current inner ring structure is kept consistent with the reference, when the GFM is switched to the GFL, the output of the power synchronous ring integrator serves as the initial value of the PLL unit integrator, and when the GFL is switched to the GFM, the output of the PLL unit integrator serves as the initial value of the power synchronous ring integrator.

The invention relates to the technical field of mass spectrometer radio frequency power supply control, and discloses a mass spectrum radio frequency voltage loop stable control circuit comprising a power supply module used for supplying power to an operational amplifier through a + 12V power supply pin and used for supplying power and establishing a potential reference; the radio frequency power supply acquisition module is used for inputting a signal to an operational amplifier of the hardware PID control module through a resistance potential-divider network and is used for acquiring and monitoring a voltage signal; according to the radio frequency voltage loop stability control circuit for the mass spectrum, through a cross calibration mechanism in which software control and a hardware PID controller are combined and output voltages of software and hardware circuits are mutual references and mutual constraints, the problem of voltage drift instability caused by long-time work of a mass spectrometer radio frequency power supply is avoided. Meanwhile, hardware PID ensures rapid dynamic response to suppress real-time voltage fluctuation, software control provides long-term stability to overcome the influence of element aging and temperature drift, and the synergistic effect of the hardware PID and the software control realizes voltage stability superior to that of a pure hardware or pure software scheme.

The invention discloses a ripple suppression method, an energy storage power supply and a storage medium, and is applied to the technical field of ripple suppression of energy storage power supplies. The method comprises sampling to obtain an output voltage; based on the output voltage and a preset multi-resonance PR controller, a plurality of first control quantities are calculated, and the first control quantities are in one-to-one correspondence based on the frequencies of the to-be-suppressed voltage ripples; calculating a third control quantity based on the first control quantity and a preset second control quantity output by a voltage loop; and calculating the duty ratio of pulse width modulation according to the third control quantity. A plurality of first control quantities that suppress a voltage ripple of an output voltage are calculated using a multi-resonant PR controller. And then, the plurality of first control quantities are superposed on a second control quantity output by the voltage loop, so that when the voltage loop realizes voltage control, a compensation waveform opposite to the ripple waveform is generated, ripple suppression is realized, and ripples of a plurality of frequencies can be suppressed at the same time. In addition, filter capacitance does not need to be increased, and the hardware cost and the system failure rate can be reduced.

The invention relates to the technical field of new energy power control, in particular to a control method of a network-forming inverter. In order to solve the problem that a traditional grid-forming type inverter can only operate stably in a weak grid environment and cannot adapt to a wide grid intensity working condition, the invention provides a grid-forming type inverter wide grid intensity adaptability control strategy based on equivalent virtual impedance, the equivalent virtual impedance of a voltage loop is improved to be matched with grid impedance, and the grid intensity adaptability of the grid-forming type inverter is improved. Therefore, the grid-forming inverter can stably operate in a strong power grid environment and a weak power grid environment, and is suitable for a power system with high-proportion new energy access.

The invention provides a charge and discharge state switching control method and a related device, and the method comprises the steps: assigning a current working mode of a charge and discharge module as a discharge state if a target full-bridge circuit is judged to meet a discharge state switching condition according to the voltage of a DC bus and the voltage of a battery pack, and controlling a switching tube in the target full-bridge circuit to seal waves, configuring enhanced pulse width modulation wave emission of a switching tube in the target full-bridge circuit to discharge, assigning a first preset value to a first output result, assigning a first preset value to an output result of a last beat of a current loop, assigning a first preset value to an output result of a last beat of a voltage loop, and assigning a second preset value to a second preset value; and assigning the output incremental stepping of the voltage loop and the current loop as a second preset value, and assigning the discharge stepping timer as a first preset value. According to the embodiment of the invention, low-delay charging and discharging switching control can be realized, the stability of the direct-current bus power supply system can be improved, and the cost can be reduced.

The embodiment of the invention discloses a current sampling calibration method, electronic equipment and a storage medium. The method comprises the steps of obtaining circulating voltage output by a voltage loop, and judging whether a fluctuation value of the circulating voltage is smaller than a preset fluctuation threshold value or not; when the fluctuation value is smaller than a preset fluctuation threshold value, current loop output values in a preset number of power frequency periods are collected and subjected to filtering processing, and filtering values corresponding to the positive and negative half cycles of the input end are obtained; calculating a difference absolute value of the two filtering values, and judging whether the difference absolute value is greater than a preset calibration threshold; when the absolute value of the difference value is greater than a preset calibration threshold value, selecting one as a reference filtering value, and determining a correction coefficient according to the size relation of the two filtering values; and taking the reference filtering value and the adjustment filtering value processed by the correction coefficient as filtering values of corresponding half cycles according to the level of the polarity signal. By means of the mode, sampling gain deviation of the mutual inductor can be eliminated through self-correction, and performance indexes such as total harmonic distortion and power factors can be improved.

The invention discloses a circuit and a method for improving the robustness of upper and lower high voltage of a new energy automobile. The circuit comprises a high-voltage loop, components of the high-voltage loop comprise a pre-charging relay K1, a main positive relay K2, a main negative relay K3, a direct-current charging positive relay K4, a direct-current charging negative relay K5, a fuse FUSE, a battery pack positive end high-voltage sampling point BAT +, a fuse rear end high-voltage sampling point FUSE +, a main positive rear end high-voltage sampling point PREE +, a battery pack negative end high-voltage sampling point BAT-and a main negative loop detection point Rly-. The circuit comprises a main negative rear-end high-voltage sampling point PREE-, a pre-charging resistor, a main negative loop divider resistor, a Hall sensor HALL, an explosion switch PSS and a shunt SHUNT. The method can effectively prevent the vehicle from mistakenly reporting errors, so that the vehicle enters an over-protection state, and safety throwing responses such as abnormal lower high voltage or incapability of higher high voltage are caused, and unnecessary severe experience is brought to a driver.