346 results about "Voltage modulation" patented technology

The invention relates to the technical field of inverter pulse width modulation, in particular to a neutral-point potential balance and low common-mode voltage modulation method and system based on an SVPWM inverter, and the method comprises the steps: determining a basic voltage vector based on different switching states of an NPC three-level inverter; respectively determining the midpoint current of each fundamental voltage vector, and determining the fundamental voltage vector causing midpoint potential deviation; combining with a large vector and a zero vector, and performing mode division of a single vector space region; determining an expected current according to the DC side capacitor voltage of the inverter, and constructing a target function based on the expected current; and performing region judgment according to the output synthesized voltage vector, determining a corresponding optimal division mode, obtaining each basic voltage vector of the synthesized voltage vector and a corresponding duty ratio, and determining a switching sequence to obtain a PWM wave. While the neutral-point potential balance and common-mode voltage suppression of the NPC three-level inverter are realized, the switching frequency of the inverter is effectively reduced, and the switching loss is reduced.

The invention discloses a high-frequency current harmonic suppression method for a modularized double-winding permanent magnet synchronous motor, and relates to the field of double-winding permanent magnet synchronous motor control. The problems that the cost is increased and energy conversion is not considered due to the fact that multiple inverters are adopted in an existing control strategy are solved. The method comprises the following steps: constructing a double-winding permanent magnet synchronous motor control system, wherein the power supply topology of the double-winding permanent magnet synchronous motor control system is an isolated interleaved parallel topology; obtaining a motor rotor position angle and a rotating speed signal, and calculating a difference value between a rotating speed given signal and a rotating speed feedback signal to obtain d-axis and q-axis current given values of two sets of windings; 6-phase current values are obtained, actual values of d-axis current and q-axis current of the two sets of windings are obtained according to the coordinate transformation matrix, and the difference value of the d-axis current and the q-axis current is solved to serve as input of a current loop PI controller; performing coordinate transformation on the output of the current loop PI controller, and calculating a voltage modulation ratio; and selecting a proper voltage modulation strategy and a carrier phase shift angle to carry out high-frequency current harmonic suppression. The method is applied to the high-frequency current harmonic suppression field.

The invention discloses a model prediction control method of a high-speed permanent magnet synchronous motor and a related device, and relates to the field of control, and the method comprises the steps: building a stator current equation capable of simulating the behavior of the high-speed permanent magnet synchronous motor based on the position change of a rotor in the same control period, a high control input basic voltage value is obtained by fixing motor parameters and combining a total disturbance parameter of a current loop system and a set stator current tracking target at the next moment at the same time; on the basis of the control input basic voltage value, current loop harmonic voltage compensation is carried out through the control input harmonic compensation voltage value to obtain a control input voltage value, and voltage modulation is carried out according to the control input voltage value to control the high-speed permanent magnet synchronous motor. According to the method, when the stator current equation is constructed, rotor position change parameters in the same control period are innovatively introduced, so that the motor behavior simulation precision is remarkably improved; the defect that the switching frequency is not fixed in a traditional finite set model predictive control algorithm is effectively overcome through the voltage modulation technology.

The invention discloses an enhanced SVG low voltage ride through method, and belongs to the technical field of electrical automation equipment, and the method comprises the steps: carrying out the three-phase voltage synthesis of a self-built voltage amplitude and a self-built voltage phase, and obtaining a current reference value through an electromagnetic square; according to the self-built voltage phase and the current reference value, a bridge arm differential mode voltage modulation wave is obtained through inner loop current control; obtaining a main circuit commutation actual value of the enhanced SVG, and obtaining a bridge arm common-mode voltage modulation wave through circulating current suppression control in combination with the self-built voltage phase; actual energy and rated energy of the enhanced SVG are obtained, and an energy modulation signal is obtained through an energy control ring; and after modulation is carried out according to the bridge arm differential mode voltage modulation wave, the bridge arm common mode voltage modulation wave and an energy modulation signal, a switching signal is generated to control the enhanced SVG, and low voltage ride through is realized. According to the invention, the problem that the enhanced SVG fails or is off-network under the condition of low voltage can be solved.

The invention discloses a low-output-ripple ultralow-offset-voltage operational amplifier and a working method thereof. The low-output-ripple ultralow-offset-voltage operational amplifier comprises a first chopper circuit, a first-stage operational amplifier additionally provided with an offset voltage adjusting circuit, a second chopper circuit, a notch filter, a second-stage operational amplifier and a third-stage operational amplifier which are sequentially connected. The offset voltage adjusting circuit trims the input offset voltage of the first-stage operational amplifier to hundreds of microvolts and then outputs the offset voltage to the second chopper circuit; the first chopper circuit and the second chopper circuit are used for modulating the offset voltage of the first-stage operational amplifier to a chopping frequency, and then the ripple voltage at the chopping frequency is filtered by the notch filter; the first-stage operational amplifier is designed to be a high-gain amplifier so as to restrain input offset voltage errors caused by the second-stage operational amplifier and the third-stage operational amplifier. According to the invention, low output ripple voltage and ultralow input offset voltage can be realized only by using the wave trap with a small area.

Aspects of this disclosure relate to a power amplifier system with symbol-based envelope tracking and fault protection. The system can include a power amplifier and a voltage modulator. The voltage modulator can include switches configured to provide the bias voltage and to provide electric circuit breaker protection. The voltage modulator can include a fault detection circuit that can cause a switch of the switches to provide electric circuit breaker protection in response to detecting a circuit fault. Related methods and voltage modulators are disclosed.

The invention relates to a voltage-mode high-speed transmitter fusing digital pre-distortion and serial driving. The voltage-mode high-speed transmitter comprises a time sequence control unit, a digital signal generation unit, a voltage modulation unit and an output matching unit, the digital signal generation unit is used for generating a pre-modulated digital signal in response to the first clock signal sent by the time sequence control unit; the voltage modulation unit is used for responding to a second clock signal sent by the time sequence control unit and sequentially performing low-speed serialization processing, retiming processing, differential processing and high-speed serialization-output driving processing on the pre-modulated digital signal to obtain a first high-speed level differential signal and a second high-speed level differential signal; and the output matching unit is used for performing impedance matching processing on the first high-speed level differential signal and the second high-speed level differential signal and outputting a corresponding first differential signal and a corresponding second differential signal. The device can be applied to high-order modulation and high-rate application scenes.

The invention relates to the technical field of integrated circuits, and provides a self-adaptive frequency modulation and voltage regulation chip control circuit and method, the circuit comprises a time sequence monitoring module which comprises a critical path replication sub-module and a daisy chain delay sub-module which are connected, and the critical path replication sub-module is used for simulating an actual critical data path in a chip; the daisy chain delay sub-module is used for applying a configurable delay amount on a time sequence to the output data signal; the time sequence performance after different time points is simulated; the first trigger is used for transmitting data signals; the sampling trigger module is used for sampling the data signal output by the time sequence monitoring module; the comparison logic module is used for generating a multi-bit time sequence margin indication code according to a comparison result; the time sequence margin indication code is used for adaptively adjusting the working frequency or the working voltage of the chip. According to the invention, through accurate monitoring and self-adaptive adjustment of a chip time sequence, all design margins can be utilized, and the energy utilization efficiency is improved, so that extreme low power consumption is realized.

The invention belongs to the technical field of power electronics, and relates to a SiC device three-level six-switch split topological rectifier control method and system. A q-axis instruction current is generated according to a power grid voltage phase angle and a square wave voltage phase angle obtained after conversion and phase locking of the three-phase power grid voltage and the square wave voltage, and a d-axis instruction current generated according to given and actual DC bus voltages; generating a three-phase voltage modulation signal according to the instruction current, the power grid voltage phase angle, and the power grid voltage and the power grid current under the two-phase rotating coordinate system, converting the three-phase voltage modulation signal into a voltage modulation signal under a two-phase static coordinate system, and generating a large sector number according to the converted voltage modulation signal; generating a three-phase modulation wave according to the translated voltage modulation signal under the two-phase static coordinate system, and generating a driving signal according to a comparison result of the three-phase modulation wave and a set carrier, and NAND logic and a large sector number of the comparison result. The alternating current zero-crossing distortion is effectively reduced, the sine degree of the current waveform is high, and the current quality is high.

The present invention discloses a harmonic suppression method, device, electronic device and storage medium, which relates to the field of harmonic suppression. The harmonics present in the current PCC voltage are determined by making a phase-by-phase difference between the PCC voltage of the isolated microgrid and the ideal target voltage, which can not only extract the integer harmonics, but also effectively determine the interharmonic components with unknown harmonic frequencies. The entire feedforward compensation process is able to reduce the impedance of the virtual synchronous generator within a wide band, reducing the voltage drop of the harmonic current introduced by the nonlinear load on the impedance of the virtual synchronous generator, thereby effectively suppressing integer harmonics and interharmonics with unknown frequencies, and achieving the effect of wide-band harmonic suppression. The entire control method achieves harmonic suppression by adjusting the three-phase voltage modulation wave of the virtual synchronous generator, does not require the addition of any additional hardware equipment, and has excellent economy.

The invention discloses a control method for eliminating low-frequency circulating current of a zero common-mode voltage modulation strategy. The control method is used for eliminating the inherent low-frequency circulating current problem of the zero common-mode voltage modulation strategy. Existing zero common-mode voltage modulation strategies all adopt repeated vector sequences, low-frequency circulating current is inevitably introduced, and the practicability of the method is seriously affected. Therefore, the invention provides a control method for adjusting the switching time sequence, and the method realizes the balanced symmetry of the polarity of the circulating current in any two adjacent carrier wave periods by exchanging the switching signals of the parallel bridge arms or reversing the switching signals of the same bridge arm, thereby eliminating the problem of low-frequency circulating current introduced by an asymmetric sequence. According to the method, by adjusting related bridge arm switching signals, alternating conversion of circulating current polarity is achieved, and an original vector time sequence of an existing zero common mode voltage modulation strategy is not damaged. Therefore, the method achieves the optimal common-mode voltage of an existing algorithm, and further eliminates the inherent low-frequency circulating current.

A voltage provision circuit includes a first NMOS transistor gated with a first control signal and sourced with a ground voltage, a second NMOS transistor gated with a second control signal complementary to the first control signal and sourced with the ground voltage, a first PMOS transistor sourced with a first supply voltage, a second PMOS transistor sourced with the first supply voltage, and a voltage modulation circuit that is coupled between the first to second PMOS transistors and the first to second NMOS transistors, and is configured to provide a first intermediate signal based on the first and second control signals. The first intermediate signal has a first logic state corresponding to the first supply voltage and a second logic state corresponding to a second supply voltage that is a fraction of the first supply voltage.

The invention belongs to the technical field of power grid control, and relates to a transformer area flexible interconnection system three-phase imbalance control method and device and a medium. Taking the transformer area converter controlled by the PQ control algorithm as a target transformer area converter; collecting a first control parameter output by an active power PI controller of the target transformer area converter; based on the upper and lower limits of the voltage target value of the DC bus, performing amplitude limiting setting on the first control parameter of the target transformer area converter to obtain the voltage target value; subtracting the voltage target value from the actual voltage value of the direct-current bus, inputting the difference value into the PI controller, and outputting a second control parameter of the target transformer area converter; taking the second control parameter as a direct-axis current target value, subtracting the direct-axis current target value from a direct-axis current actual value, and taking the difference value as the input of a direct-axis current PI controller; and controlling the target transformer area converter based on the voltage modulation signal output by the PQ control framework. The scheme can effectively improve the power supply reliability of the power distribution area and stabilize the DC bus voltage.

The invention provides a high-voltage modulation circuit supporting continuous and high-repetition-frequency pulse work, relates to the technical field of microwave and millimeter wave phased array radars, and solves the defect problem that continuous work and high-repetition-frequency pulse work cannot be supported at the same time under high-voltage input in the prior art. In the high-voltage modulation circuit, an input signal driving circuit is used for controlling an integrated gate driver through a first complementary driving signal; the grid voltage control power supply circuit is used for controlling the power supply of the input signal driving circuit according to the grid voltage of the last-stage power amplifier chip; the integrated gate driver is used for respectively controlling on and off of the modulation switch tube and the discharge tube according to the first complementary driving signal; the dead zone adjusting circuit is used for adjusting and modulating the switching speed of the switching tube and the discharge tube; the isolation power supply circuit is used for supplying power to the integrated gate driver and maintaining conduction of the modulation switch tube under high-voltage input; the method has the advantages of being high in design adjustment freedom degree, safe in circuit logic, adaptive to various working scenes and multi-platform multi-purpose application.

The invention discloses a method for modulating two parallel converters based on zero common-mode voltage and zero-sequence circulating current suppression, which comprises the following steps of: firstly, analyzing the influence of 64 switch combinations on zero-sequence circulating current and common-mode voltage, simultaneously considering common-mode voltage elimination and zero-sequence circulating current suppression, and screening out 18 optimal switch combinations; secondly, in order to eliminate the low-frequency zero-sequence circulating current, designing six switch sequence templates which are symmetrical in a quarter period, and limiting the average value of the zero-sequence circulating current of each switch period to be 0; then, on the basis of the sequence template, starting from the angle of zero-sequence circulating current peak value minimization and switching loss optimization, a vector plane is divided into six large sectors, each large sector comprises six sub-sectors, and the optimal switching sequence of each area is obtained; and finally, a modulation wave is calculated for the optimal switching time sequence, a switching action mode is designed, and a driving signal of the switch is obtained. According to the invention, the problems of low-frequency zero-sequence circulating current and large zero-sequence circulating current peak value existing in the existing zero common-mode voltage modulation algorithm are solved.

The invention discloses a high common-mode transient suppression OOK modulation circuit based on output substrate modulation, which is characterized in that a reset control circuit and a common-mode substrate modulation circuit are added on the basis of a traditional OOK modulation circuit, and the substrate potential of an NMOS (N-channel Metal Oxide Semiconductor) tube in a traditional OOK signal output driving phase inverter is changed from fixed grounding to OOK output common-mode voltage modulation. When common-mode coupling interference occurs on a differential OOK signal, the pull-down capability of the phase inverter NMOS tube is adjusted by adjusting the substrate voltage of the phase inverter NMOS tube, so that the overturning threshold voltage of the phase inverter can be kept unchanged, and the influence of common-mode transient coupling interference is counteracted and suppressed. The method can be widely applied to isolation system chips such as various digital isolators and isolation type driving chips.

The invention provides a flexible direct current converter valve system and a modulation method thereof. Based on a novel hybrid module series structure, target voltage modulation is carried out by controlling a switch device trigger pulse in stages through polarity distribution of modulation wave voltage and bridge arm current. And executing a four-stage pulse adjustment process in an inversion or rectification mode, and dynamically managing the removal and input time sequence of the improved half-bridge power module. According to the method, the trigger pulse is accurately regulated and controlled according to the real-time polarity and the transition state of the voltage and the current, and the problems of instantaneous overcurrent and local overheating of a switching device under the overload condition in the traditional bridge arm topology are avoided. Through staged logic control, the system maintains the stability of the modulation wave voltage, reduces the thermal stress accumulation of the device, improves the endurance capability of the converter valve under a complex working condition, does not need external current limiting intervention, and enhances the operation flexibility and reliability.

The invention provides a method and a device for suppressing a direct current component of an output current of network construction type equipment. The method comprises the following steps: acquiring a three-phase current value of a grid-connected point of the network construction type equipment; decomposing the three-phase current value into dq-axis current components based on coordinate transformation; extracting a dq-axis current component of 50Hz from the dq-axis current components; taking the condition that the 50Hz dq-axis current component is equal to 0 as a control target of a current control model, and obtaining a dq-axis modulation voltage increment required for realizing the control target based on the current control model; and injecting the dq-axis modulation voltage increment into a voltage modulation link of the network construction type equipment to form suppression control on the direct current component of the output current. According to the method provided by the invention, the direct-current component can be quickly suppressed, so that the overcurrent capability of the equipment is released, and the equipment can be used for supporting the system voltage to the greatest extent.

Aspects of this disclosure relate to voltage modulators with staged activation of switches. A voltage modulator can receive supply voltages and provide a selected one of the supply voltages as an output voltage. The voltage modulator can include switches in parallel where one of the switches in parallel activates before another switch in parallel in association by transitioning the output voltage between different supply voltages. Embodiments of this disclosure relate to symbol-based envelope tracking. Related systems and methods are disclosed.

The invention relates to an aircraft spectral data dynamic acquisition method, which comprises the following steps of: designing working modes of a voltage modulation reconstruction type spectrograph, including a full-wave band spectral acquisition mode, a specific wave band spectral acquisition mode and a standby mode; determining use conditions; when the spectrograph works in a full-band spectrum acquisition mode, setting the voltage of the full-band spectrum as m1 groups of voltages, detecting an incident spectrum to obtain m1 groups of light intensity signals, and performing spectrum reconstruction calculation to obtain all spectrum information; when working in a specific wave band spectrum acquisition mode, setting the voltage of a specific wave band spectrum as m2 groups of voltages, m2 < = m1, detecting an incident spectrum to obtain m2 groups of light intensity signals, and performing spectrum reconstruction and calculation to obtain specific spectrum information; in a standby mode, a single voltage is set, an incident spectrum is detected to obtain a group of light intensity signals, and spectrum reconstruction is not carried out. According to the method, the problems of bandwidth occupation, storage pressure, energy consumption increase and the like caused by whole-process full-amount transmission are solved, and meanwhile, the differentiated requirements of different task stages for specific data are met.

The invention discloses an X-ray source tube voltage adaptive modulation CT scanning method, and relates to the technical field of tube voltage regulation, and the method comprises the following steps: S1, pre-scanning a patient; s2, drawing a scanning part contour according to a pre-scanning result; s3, selecting a tube voltage modulation optimization model; s4, determining a corresponding tube voltage modulation scheme according to the part contour and the optimization model; s5, scanning the patient by adopting a tube voltage modulation scheme, and acquiring projection data of a plurality of energy spectrums by utilizing a double-layer detector or a photon counting detector; and S6, performing dual-energy decomposition on the projection of each angle, and reconstructing to obtain a cross-sectional image of the measured part of the patient. According to the method, the tube voltage modulation scheme is obtained according to the parameter model, the image quality is effectively improved, the utilization rate of the radiation dose is improved, and a better CT image is obtained through less dose.

The invention discloses a Kelvin source series connection type active gate drive circuit, and belongs to the technical field of power generation, power transformation or power distribution. The circuit is composed of a signal conditioning circuit, a bidirectional follower circuit, a feedback capacitor, a gate driver and a power supply circuit thereof, and a driving resistor. The signal conditioning circuit is provided with two input ports and two output ports, the two input ports are respectively connected with a power source electrode and a feedback capacitor of the switching device, and the two output ports are connected with an input port of the bidirectional follower circuit. The bidirectional follower circuit is provided with two input ports and a modulation output port, and the modulation output port is connected with a reference point of the gate driver and the power supply circuit of the gate driver. The output port of the gate driver and power supply circuit is connected with the gate of the switching device after being connected with the driving resistor. On the basis of common gate drive, low-delay and real-time feedback closed-loop active gate drive is realized by changing a circuit connection structure and utilizing reference point voltage modulation, and the purpose of reducing voltage and current overshoot of a power device is achieved.

The invention discloses an injection control method and system for dual-frequency characteristic signals of a centralized photovoltaic inverter, and the method comprises the steps: switching from a normal control strategy to a low-voltage ride-through control strategy and an additional signal injection control strategy according to a starting criterion after a power system breaks down; performing frequency separation on the alternating current electric quantity; a negative sequence suppression strategy is adopted for the power frequency negative sequence component, a reactive power priority strategy is adopted for the power frequency positive sequence component, and a first voltage modulation wave signal is obtained; obtaining a second voltage modulation wave signal for the double-frequency characteristic electrical quantity under the non-power frequency; and superposing the first voltage modulation wave signal and the second voltage modulation wave signal to realize injection of a double-frequency signal of the sending-out line. According to the invention, a low-voltage ride-through strategy and current limiting can be realized by using the inverter, and a control scheme for generating two different non-power-frequency signals is provided by depending on the regulation and control characteristics of the inverter, so that stable injection of double-frequency signals in a sending-out line is realized.

The invention provides a method for measuring additional phase delay introduced by optical voltage transformer light source wavelength fluctuation. The method comprises the following steps: S1, constructing an optical voltage transformer for realizing linear demodulation of phase delay based on an annular radial polarization grating; the optical voltage transformer comprises a light source, a polarizer, an electro-optical crystal, a quarter-wave plate, an annular radial polarization grating and a four-quadrant detector. An electric field where the electro-optical crystal is located is generated by alternating current voltage to be measured; and S2, modulating a to-be-measured AC voltage into two times of the half-wave voltage of the electro-optical crystal, and obtaining the additional phase delay introduced by the fluctuation of the central wavelength of the light source according to the light spot rotation angle measured by the optical voltage transformer. Direct linear measurement of phase delay is realized based on the annular radial polarization grating, and then additional phase delay introduced by light source center fluctuation is completely extracted and compensated, so that the problem of light source wavelength fluctuation is solved.

The invention relates to the technical field of energy storage systems, and discloses a harmonic suppression method and system of an energy storage converter. According to the method, harmonic disturbance generated during switching of the switching state is analyzed based on the voltage modulation instruction and the switching characteristic parameters, so that prospective prediction of voltage harmonics caused by switching action time sequence deviation is realized, and the problem of detection and control delay existing in a traditional method is solved; carrying out credibility evaluation on the obtained prediction information of the voltage harmonic wave based on the real-time current harmonic component and the voltage harmonic wave disturbance prediction quantity, and fusing the real-time current harmonic component and the voltage harmonic wave disturbance prediction quantity based on the result to generate a harmonic wave suppression target with a quick response characteristic and high precision; and a safety voltage control instruction capable of effectively suppressing a harmonic suppression target is obtained through a closed-loop iterative optimization mechanism, so that the inherent contradiction that the harmonic suppression effect and the safety constraint are difficult to consider at the same time is solved, and the comprehensive performance of harmonic suppression is improved.

According to the superconducting quantum interference device based on the Josephson junction and the preparation method of the superconducting quantum interference device based on the Josephson junction, the manufacturing process of the Josephson junction is improved, and an organic cleaning process is added in the photoresist stripping process, so that the side wall formed by continuous stacking can be removed, the quality of a subsequently deposited film is improved, and the performance of the superconducting quantum interference device is improved. The SQUID output curve is not easy to generate resonance, and the yield of the SQUID batch preparation process is improved; on the basis of a traditional SQUID, each Josephson junction is additionally connected in series or in parallel with one Josephson junction to form the SQUID with four Josephson junctions, so that a larger output voltage modulation depth is obtained, the SQUID has higher sensitivity, lower noise and a larger linear range, a circuit is not prone to losing lock, and the SQUID has the advantages of being simple in structure, low in cost and high in reliability. A lengthy offset line does not need to be added, the problems of magnetic flux crosstalk, poor magnetic flux coherence and the like do not need to be worried about, and the layout structure design is simpler and more convenient.

The invention discloses a current imbalance suppression method, device and system and a storage medium. The method comprises the following steps: acquiring a three-phase current output by a motor under a three-phase static coordinate system; converting the three-phase current into a two-phase current under a two-phase static coordinate system; based on a second-order generalized integral, two-phase current obtained after three-phase current conversion is extracted, and a negative-sequence current component of the two-phase current in a two-phase static coordinate system is obtained; obtaining a negative sequence voltage compensation amount based on the negative sequence current component; and superposing the negative-sequence voltage compensation quantity into the three-phase voltage modulation wave, and suppressing a negative-sequence current component in the three-phase current output by the motor. According to the method, the condition that the three-phase current of the motor is unbalanced can be improved, the operation stability and reliability of the motor are improved, and the service life of the motor is prolonged.

The present invention discloses a low common-mode voltage modulation strategy for a three-level three-phase four-bridge-arm inverter, and belongs to the field of photovoltaic power generation. The modulation strategy comprises the following steps: sampling a three-phase modulation wave and a superimposed zero-sequence component; respectively giving the carriers used by the first three bridge arms and the fourth bridge arm; generating a PWM wave to drive the inverter to work. Aiming at the problem that the common-mode voltage of the three-level three-phase four-bridge-arm inverter is relatively high, the existing modulation algorithm is complex, the amount of calculation is large, and it is not conducive to promotion to engineering applications, the present invention proposes a low common-mode voltage modulation strategy for a three-level three-phase four-bridge-arm inverter without adding or changing any hardware. The modulation strategy can reduce the common-mode voltage amplitude of the three-level three-phase four-bridge-arm inverter and the number of common-mode voltage level changes within one carrier cycle by only changing the carrier phase.

Presented herein are systems, devices, and methods for inverter control. The device may include a computer-readable medium having instructions stored thereon. The device may include at least one processor configured to execute the instructions. The at least one processor may monitor for an initiation of a connection between an inverter and an electrical bus to convey electrical power. The at least one processor may engage, responsive to detection of the initiation, phase locked loop (PLL) control on the electrical power conveyed via the inverter to synchronize the inverter with the electrical bus. The at least one processor may determine that a synchronization between the inverter and the electrical bus is complete. The at least one processor may disengage, responsive to the determination that the synchronization is complete, the PLL control on the electrical power conveyed between the inverter and the electrical bus.

The invention discloses a control method based on a single-phase cascaded H-bridge energy storage converter, and relates to the technical field of power electronic converters. The method comprises the steps of calculating a capacitor voltage average value and output reactive power; calculating an output alternating current reference amplitude based on the capacitor voltage average value; calculating an output current phase reference value based on the reactive power; combining the output alternating current reference amplitude and the output current phase reference value to generate an output alternating current reference value; calculating a difference value between the output alternating current reference value and the grid-connected point alternating current; and calculating a voltage modulation signal of the full-bridge DC / AC converter based on the difference value, and controlling the single-phase cascaded H-bridge energy storage converter. The method is simple in structure and easy to implement, specified power output can be achieved by controlling the full-bridge DC / AC converter, calculation complexity is effectively reduced on the basis of achieving power control, calculation efficiency can be improved, and the method has high application value in engineering design.