592 results about "Voltage compensation" patented technology

The invention relates to the technical field of resonance suppression, and discloses an active damping control LC resonance suppression method and device. The method comprises the following steps: performing parameter identification processing based on bus voltage to obtain an inductance value, a capacitance value and a resonance frequency of an LC circuit; extracting a resonant current component of the current signal based on the resonant frequency; calculating damping power according to the resonance current component, and converting the damping power into a voltage compensation instruction under an alpha-beta coordinate system; generating a PWM control signal according to the voltage compensation instruction and a voltage reference instruction; and performing on-off control on the inverter based on the PWM control signal, and injecting power opposite to the resonant current component into the LC circuit to generate a virtual damping effect. Virtual impedance characteristics are seamlessly integrated into inverter control, rapid response of the whole process from resonance detection to power injection is ensured, the resonance peak value is effectively suppressed, and the current quality is improved.

The invention relates to the technical field of converter power averaging and circulating current suppression, in particular to a power averaging and circulating current suppression method for parallel operation of a plurality of grid-forming type energy storage converters, which averages power through communication interaction and generates frequency and voltage compensation quantity by adopting a first regulator and a second regulator to realize accurate power averaging; meanwhile, the total current is measured locally, and virtual impedance feedforward control is adopted, so that rapid suppression of the high-frequency circulating current is realized. According to the invention, high-precision active power and reactive power equalization is realized, the capacity utilization rate is improved, high-frequency circulating current is effectively suppressed, loss and thermal stress are reduced, dynamic performance and system reliability are considered, a cooperative control architecture with complementary advantages is formed, adaptability to complex working conditions and system stability are enhanced, and engineering applicability is improved.

The invention provides an impedance scanning device based on network side voltage dynamic compensation under a three-phase voltage imbalance working condition, and relates to the technical field of new energy station power electronic converter topology and control, the device comprises a three-phase rectifier, a direct current bus capacitor, an inverter, a voltage compensation device, a frequency sweeping device, a circuit breaker and a series transformer part, the three-phase rectifier is connected in series with inverters of the voltage compensation device and the frequency sweep device, a secondary side of a series transformer of the voltage compensation device is connected in series with a network side, a secondary side of a series transformer of the frequency sweep device is connected in series with a grid-connected point, and a primary side of the series transformer is connected to the inverters and is coupled to a secondary side of the series transformer; according to the device, the power grid side voltage is rectified through the voltage compensation unit and is compensated to the grid side after being subjected to single-stage inversion transformation, voltage compensation is achieved through the energy of a power grid when the voltage is unbalanced, and an external energy source or an interference source does not need to be introduced. After compensation, the accuracy of the frequency sweeping result is obviously improved.

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 an open-phase self-fault-tolerant control method for a phase-shift-free dual three-phase permanent magnet synchronous motor. The method can automatically adjust a current distribution relation in the case of an open-phase fault and suppress torque pulsation in combination with neutral point voltage compensation. Comprising the following steps: driving two pairs of three-phase winding modules of the phase-shift-free DTP-PMSM in parallel by adopting two two-level three-phase voltage source inverters, and providing a mathematical model of the motor; current distribution is automatically adjusted; compensating the voltage of the neutral point, and calculating the offset of the fault module; the current is redistributed to suppress the torque ripple after the fault, and the secondary oblique wave component generated by the phase failure fault is eliminated; a current loop controller is improved through dead-beat predictive control; the speed ring controller is optimally designed into an improved sliding mode controller; an improved double-loop controller system is formed by combining improved sliding mode control and dead-beat prediction control, high-gain parameters are set to improve the dynamic response performance of the system, and a new self-fault-tolerant control system is formed.

The invention relates to the field of power grid simulation, and particularly discloses a control method of an alternating-current power grid broadband oscillation simulation device based on a component physical model, which realizes broadband domain oscillation simulation of an alternating-current power grid based on the component physical model and a notch filter. Specifically, according to the control method of the alternating-current power grid broadband oscillation simulation device based on the element physical model, an adjustable element physical model type and a corresponding impedance parameter serve as input conditions, and a dynamic voltage compensation component excited by power grid impedance is calculated in combination with an adjustable notch filter; and a power grid simulation reference signal is constructed in real time through superposition of an original input reference voltage value and a dynamic voltage compensation component excited by power grid impedance, so that oscillation simulation in a wide frequency domain of the alternating-current power grid is realized.

The invention provides a lithium-sulfur battery abnormal heating diagnosis method and system based on deep learning, and belongs to the technical field of lithium-sulfur battery safety monitoring. According to the method, an enhanced temperature difference sequence is constructed based on temperature and voltage detection data, a temperature state sequence is modeled, and continuous dynamic representation of thermal behaviors is realized; a double-path gating mechanism is designed, a global temperature rise suppression gate is utilized to capture the overall temperature rise trend, and an abnormal temperature rise sensitive gate is combined to focus local violent fluctuation, so that normal charging and discharging temperature rise interference is effectively suppressed, and temperature abnormal probability distribution is output; meanwhile, according to the interval where the current SOC is located, a corresponding voltage compensation function is selected, original voltage data are corrected point by point, a double-group long and short time memory network is designed to extract voltage platform drift characteristics, the perception capability of abnormal drift caused by the polysulfide effect is enhanced, and finally a comprehensive risk index is generated. And when the lithium-sulfur battery is under the polysulfide shuttle effect, the battery heating abnormity identification accuracy and robustness are obviously improved.

The invention relates to the technical field of motor control, and discloses a voltage compensation stable management system for a vortex oscillator motor, and the system comprises a detection unit which is used for collecting a bus current signal; the processing unit is used for performing differential operation on the bus current signal to determine a current change rate, judging that a load sudden change working condition is entered when the current change rate exceeds a preset threshold value, and further querying a load response coefficient according to a preset feature table and calculating a voltage compensation increment; and the driving unit is used for adjusting the phase shift angle of the excitation voltage according to the voltage compensation increment. According to the invention, by identifying the load working condition in real time and executing feedforward compensation, the instantaneous voltage drop caused by load switching is eliminated, the voltage steady-state characteristic of a motor driving link is maintained, the rotation speed fluctuation is effectively inhibited, and the dynamic response capability of the system under the variable load working condition is enhanced.

The invention relates to the technical field of micro-grid control, and provides an island micro-grid distributed control method, system and device and a storage medium. Comprising the following steps: performing voltage compensation gain and frequency compensation gain calculation based on droop control output of each distributed power generation unit, droop control output of all neighbor distributed power generation units, and a voltage dynamic tracking error and a frequency dynamic tracking error which are obtained by calculating a microgrid global recovery target to obtain secondary adjustment output; and after corresponding items in the droop control output and the secondary regulation output are summed to generate comprehensive reference output, voltage synthesis is carried out according to the comprehensive reference output to obtain voltage regulation output for output control of a corresponding inverter. Based on a distributed regulation and control mechanism for cooperatively calculating the compensation amount of each power generation unit by using neighbor information and a global recovery target, the dynamic response speed and the power distribution precision can be improved, voltage drop and frequency deviation caused by load disturbance are effectively eliminated, and rapid recovery is realized.

A control system for a direct current (DC) microgrid is described. The control system includes a DC bus with a positive bus line and a negative bus line, DC battery circuits with a positive coupler connected to the positive bus line and a negative coupler connected to the negative bus line, switches including a control input terminal located in each DC battery circuit, a distributed generator circuit connected to the DC bus, a constant load power circuit connected to the DC bus, a computing device connected to each control input terminal, the DC bus, the distributed generator circuit and the constant load power circuit. The computing device includes an electric circuitry, a memory, and at least one processor to determine a DC bus voltage, determine the SoC of the DC battery circuits, generate PWM signals that control the DC bus voltage, and balance the SoC of the DC battery circuits.

The invention belongs to the technical field of battery state detection, and discloses a lead-acid battery health assessment method and system based on simulated working conditions. Comprising the steps of collecting lead-acid battery simulation operation data and performing data cleaning to obtain high-quality battery data; screening recovery effect data and removing the recovery effect data from the high-quality battery data to obtain disturbance-removed battery data; performing polarization voltage compensation to generate voltage compensation battery data; abnormal impact identification is executed, abnormal data filtering is carried out on the voltage compensation battery data based on an identification result, and reasonable battery data is output; identifying long-period data and performing risk judgment to obtain corrected battery data and cover corresponding data in the reasonable battery data to obtain differentiated battery data; performing health state evaluation on the differentiated battery data, and outputting health indexes of the lead-acid battery; and the evaluation accuracy of the real health level of the battery under the simulated working condition is remarkably improved.

The invention discloses a battery charging and discharging power self-regulation control circuit, which relates to the technical field of battery control, and comprises a power supply module, a micro-control module, a voltage sampling and comparison module, a battery charging and discharging power self-regulation control module, a battery charging and discharging power self-regulation control module, a battery charging and discharging power self-regulation control module and a battery charging and discharging power self-regulation control module, the power regulation module compensates the direct-current electric energy, the battery module stores energy, the power regulation module and the direct-current electric energy are superposed and supply power to the battery module, during the discharging period, according to the voltage comparison condition, the power regulation module carries out voltage compensation processing on the battery module, and the battery module directly supplies power to the discharging module; and the power regulation module performs voltage balance control on the battery module. The battery charging and discharging power self-adjusting control circuit can prolong the service life of the battery, improve the charging and discharging efficiency, reduce the electric energy loss of the power adjusting module, improve the energy utilization rate and provide higher charging voltage.

The invention relates to the technical field of flexible power transmission of a power system, in particular to a coordinated optimization method and system of a distributed power flow controller and a medium, and the method comprises the steps: building a layered equivalent coupling model of the distributed power flow controller; taking minimization of the total loss of the flexible power transmission system as an optimization target, and performing global optimization on a parallel side output voltage vector and a series side injection voltage vector of the distributed power flow controller by using a layered equivalent coupling model to obtain an optimal coordinated optimization control strategy; obtaining a target control parameter in a target control mode according to the optimal coordination optimization control strategy; and according to the target control parameter and the real-time voltage and current data of the power transmission line, calculating a voltage compensation amount needing to be injected into the flexible power transmission system, and according to the voltage compensation amount, carrying out coordinated optimization control on the power flow of the power transmission line. According to the method, the parallel side and the series side of the distributed power flow controller are coordinated and optimized by establishing the layered equivalent coupling model, so that the voltage stability and power flow equilibrium distribution of the flexible power transmission system are effectively improved.

The invention discloses a low-voltage line intelligent voltage regulation voltage stabilizer control system, and relates to the technical field of voltage stabilizer control, an intelligent control unit judges whether the current line voltage needs voltage regulation control based on a control algorithm, if yes, a corresponding voltage regulation control instruction is generated, a silicon controlled rectifier switching module executes non-contact on and off operation, and the voltage regulation control is completed. The voltage regulation compensation module is used for carrying out voltage compensation on the basis of the output of the voltage transformation module, so that the output voltage is controlled within a preset range, and when the power grid voltage is detected to be recovered and stable within a set time, and when the power grid voltage is detected to be abnormal, the voltage regulation compensation module is used for carrying out voltage compensation on the basis of the output of the voltage transformation module. And the intelligent control unit is automatically switched into a bypass for operation. According to the control system, a voltage stabilization control framework with high response speed, three-phase independent adjustment capability, an intelligent dormancy mechanism and a complete fault protection system is constructed, and the intelligent level and the operation performance of the low-voltage power distribution system are remarkably improved.

The invention discloses a motor adaptive harmonic suppression system and method fused with LSTM prediction, and belongs to the technical field of power electronic control. Comprising a harmonic feature extraction module, a trapezoidal angle prediction module, an integral adjustment module and a trapezoidal voltage compensation module. The harmonic feature extraction module converts the three-phase current into dq-axis current; the trapezoidal angle prediction module establishes a model for predicting an optimal initial trapezoidal angle based on a long short-term memory neural network according to the d-axis harmonic current, the motor rotating speed and the bus voltage; the integral adjusting module adjusts a trapezoidal angle on line by inputting a harmonic error; and the trapezoidal voltage compensation module is used for modulating trapezoidal compensation voltage and outputting compensation voltage required by an alpha axis and compensation voltage required by a beta axis. According to the invention, prediction of the long-short-term memory neural network and online adjustment of the trapezoidal angle and modulation of the trapezoidal compensation voltage of the integrator are fused, the harmonic current of the permanent synchronous motor control system can be effectively inhibited, the torque ripple of the motor is reduced, and the performance of the motor is improved.

Systems and methods are provided for a transportation vehicle. A system includes a power delivery component comprising a power delivery port and a power meter component to measure a power delivery component voltage received at the power delivery component via a cable, and a seat box connected to the power delivery component via the cable and configured to provide a supply voltage to the power delivery component via the cable. The seat box comprises a DC-to-DC converter to convert an initial DC voltage to a seat box DC voltage, a voltage compensation component to change the seat box DC voltage to the supply voltage, and a microcontroller configured to receive the power delivery component voltage from the power meter component, determine a voltage drop across the cable based on the power delivery component voltage, and control the voltage compensation component to adjust the supply voltage based on the voltage drop.

The invention relates to a terminal voltage flexible regulation and control method, and the method comprises the following steps: presetting target voltage parameters which comprise an amplitude value, a frequency and an initial phase angle; calculating a three-phase sinusoidal voltage reference signal based on a virtual synchronous machine algorithm according to the target voltage parameter; according to the three-phase sinusoidal voltage reference signal, generating a driving signal by using pulse width modulation, and controlling the on and off of an IGBT power switch device to generate a three-phase sinusoidal compensation voltage; injecting the three-phase sine compensation voltage into the tail end of a power grid; monitoring the voltage state of the power grid in real time, and calculating the deviation between the actual voltage of the tail end of the power grid and the target voltage parameter; and according to the deviation, adjusting a control parameter in the virtual synchronous machine algorithm, and updating the three-phase sine compensation voltage to compensate the voltage deviation at the tail end of the power distribution network. Voltage deviation can be compensated in time, and the problem of voltage change caused by large fluctuation of electrical load can be effectively solved.

The invention relates to the technical field of voltage compensation, in particular to a rapid compensation method for realizing stable voltage output of a distribution line in a transformer area. The method comprises the following steps: dividing a plurality of characteristic intervals according to the difference between each phase of voltage data and a standard voltage; determining a deviation characteristic value of the phase voltage according to the correlation degree between the phase voltage and each type of other data of the node, the maximum deviation value of the phase voltage and the maximum deviation value of each type of other data; according to the intersection-to-union ratio and the deviation characteristic value of each characteristic interval and each overrun interval, determining an influence characteristic value of the characteristic interval; determining a compensation coefficient of the phase voltage of the node according to the three-phase unbalance degree of each key node and the corresponding intermediate node and the influence characteristic value of the characteristic interval; and determining the reactive compensation amount according to the rated voltage value, the real-time voltage and the line impedance in response to the fact that the real-time voltage is located outside the preset interval. The method can improve the stability of voltage output of the distribution line in the transformer area.

The invention relates to the technical field of power grid switching, and provides a grid-connected and off-grid seamless smooth switching method and device, electronic equipment and a storage medium thereof. The method comprises the following steps: acquiring a power grid phase angle and dq-axis voltage in real time through SRF-PLL phase locking, performing Clarke-Park conversion on VSG output current, and calculating active power and reactive power; based on the power deviation, the virtual inertia and the damping coefficient, dynamic optimization is carried out to obtain self-adaptive inertia and damping; performing secondary voltage compensation by combining the dq-axis voltage amplitude difference and the real-time reactive power to generate excitation voltage; frequency compensation is realized by using a phase difference and a dynamic phase tracking model; a switching instruction is generated through multi-threshold judgment, linear transition is conducted on reference current and reactive power through a transition function during switching, a non-jump current instruction is output, and grid-connected and off-grid seamless switching is achieved by closing PWM. According to the invention, grid-connected and off-grid seamless switching and high-precision voltage frequency control are realized through multi-threshold judgment, soft-closed PWM and the like.

The invention discloses a state-based dynamic threshold event triggered SoC balance control method for an aviation power distribution network. The method comprises the steps of S1, platform construction and parameter initialization; s2, calculating and updating a voltage compensation item in real time; s3, triggering the design of an SoC balance controller based on a dynamic threshold event of the state; s4, reference voltage synthesis and closed-loop control; the method can be applied to an aviation power distribution network system with a plurality of battery energy storage nodes which are mutually connected in parallel, through dynamic adjustment of a trigger threshold value and cooperative correction of a droop coefficient and voltage compensation, estimation errors caused by time delay are restrained while communication overhead is remarkably reduced, SoC balance of the aviation power distribution network is achieved, and the system performance of the aviation power distribution network is improved. And bus voltage adjustment and distribution of current according to capacity proportion are considered.

A power converter includes a transformer, a resonant capacitor, a high-side transistor, a low-side transistor, a rectification circuit, a feedback circuit, a detection circuit, and a control circuit. The transformer includes a primary coil coupled to a switch node and a secondary coil. The resonant capacitor is coupled to the primary coil. The high-side transistor provides an input voltage to the switch node, and the low-side transistor couples the switch node to the ground. The rectification circuit converts the energy of the secondary coil into an output voltage. The feedback circuit compares the output voltage with a reference voltage to generate a compensation signal. The detection circuit generates a current detection signal and a voltage detection signal. The control circuit drives the high-side transistor and the low-side transistor based on the current detection signal, the voltage detection signal, the compensation signal, and the input signal.

The invention discloses a VSG deadbeat prediction control method based on impedance identification adaptive compensation, and the method comprises the following steps: collecting the grid-connected point voltage and current of a three-phase grid-connected converter, and converting the voltage and current into corresponding components in a rotating coordinate system; and identifying a power grid impedance parameter based on the component, calculating a system short-circuit ratio, comparing the system short-circuit ratio with a preset threshold value, and selecting a standard predictive control or impedance adaptive compensation mode. In a standard mode, a virtual synchronous generator discretization mathematical model considering system delay is constructed, and first control voltage is generated through dead-beat predictive current control; and in the compensation mode, self-adaptive compensation of a power grid impedance parameter is introduced on the basis of the first control voltage, a final control voltage is obtained, a PWM driving signal is generated according to the final control voltage, and grid-connected operation of the converter is controlled. According to the method, dead-beat predictive current control and a virtual synchronous generator technology are combined, a power grid impedance identification and self-adaptive compensation mechanism is added, and self-adaptive high-performance control of the converter under strong and weak power grid conditions is realized.

The invention relates to a harmonic suppression and dynamic voltage compensation method based on a composite control series filter, and belongs to the field of power electronic technology and electric energy quality control. Harmonic current passing through a primary winding of a transformer and a sudden rising or falling signal of power supply voltage are extracted, and after the two signals are controlled and combined into a reference signal, a voltage source inverter (VSI) connected with a secondary side of the transformer in parallel shows a controllable voltage characteristic. The control parameters of the harmonic current can enable the transformer to present relatively large controllable impedance to harmonic waves, so that harmonic wave isolation is realized. In addition, the VSI compensates for the system voltage deviation by detecting the voltage drop. And finally, establishing a simulation model to verify that the series active power filter based on the control strategy can isolate harmonic waves and effectively compensate voltage deviation. Harmonic suppression and dynamic voltage compensation functions can be realized at the same time, and the power quality of a middle-high voltage system is improved.

The invention discloses a self-adaptive virtual inertia control method and device for an energy storage DAB converter, relates to the field of converter control, and comprises three parts of current feedforward control based on low-pass filtering, voltage compensation control and virtual capacitor Cv parameter self-adaption. Wherein current feed-forward compensation in a low-pass filtering mode is added in a loop causing initial voltage abrupt change so as to improve initial drop of bus voltage, steady-state voltage compensation is added in a droop link so as to realize zero-difference adjustment of the bus voltage, and a function is constructed according to bus voltage deviation and change rate so as to realize self-adaptive adjustment of the virtual capacitor Cv. According to the control method provided by the invention, the bus voltage fluctuation can be effectively inhibited, the voltage steady-state error is reduced, and the supporting capability of the energy storage unit on the bus voltage is improved.

The invention relates to the technical field of transformer intelligent optimization compensation, in particular to an electric energy quality compensation method and equipment for new energy access to a power grid, and the method comprises the steps: connecting a dynamic voltage compensation converter in series at the low-voltage side of a transformer, and connecting a high-power bidirectional converter in parallel at the load side of a terminal, acquiring the voltage of the low-voltage side of the transformer at each moment in each period, and recording the voltage as transformer voltage; acquiring load current and load voltage at each moment in each period of the load side of the terminal; determining the influence weight of harmonic disturbance, the influence weight of reactive power disturbance and the influence weight of voltage out-of-limit in each period; constructing a target function; and obtaining an optimal power factor, each harmonic current component and each transformer voltage in the current period by utilizing an intelligent optimization algorithm and combining the objective function, and respectively performing transformer voltage compensation, reactive compensation and harmonic current compensation on the current period. Therefore, the overall stability of electric energy quality is improved.

The invention belongs to the technical field of display driving, and particularly relates to a noise reduction circuit, a gate driving circuit, a voltage compensation method and a display panel, and the noise reduction circuit comprises a first compensation unit which is used for responding to a first compensation control signal output by an external control device and outputting a corresponding first compensation voltage; the noise reduction control unit is used for controlling the voltage on the noise reduction control node to meet a preset reference range under the action of the first compensation voltage; the noise reduction execution unit is configured to respond to the voltage on the noise reduction control node and execute noise reduction processing on at least one node subjected to noise reduction; the detection unit is used for detecting the actual voltage on the noise reduction control node; through a closed-loop control mechanism of real-time detection and dynamic compensation, attenuation of the voltage of the noise reduction control node is actively counteracted, the problem of unstable noise reduction caused by threshold voltage drift of the control transistor is improved, and the noise reduction stability of the noise reduction circuit in long-term work is remarkably improved.

The invention relates to the technical field of power electronics and electric energy quality management, in particular to a TNPC-UPQC multi-target finite set prediction control method and system based on midpoint potential self-balancing, and the method comprises the steps: building a parallel side current prediction model based on a KVL equation, and building a series side voltage prediction model based on a voltage compensation relation; constructing a direct-current side total voltage prediction model based on a power balance principle, and constructing a neutral-point potential prediction model by accurately calculating a neutral-point current; the method comprises the following steps: constructing a model multi-objective cost function, determining cost function values corresponding to various switching states of the converter by adopting the multi-objective cost function, selecting an optimal switching state which enables the cost function to be minimum, applying the optimal switching state to the converter, and directly controlling the on and off of a corresponding power switching device. In order to dynamically coordinate the priority of each target under different working conditions, a self-adaptive inertia weight adjustment algorithm is introduced, and the algorithm can effectively balance the global search capability and the local search capability.

The invention relates to the technical field of controllable series compensation, in particular to a power distribution area voltage rapid compensation device and compensation method based on controllable series compensation, and the method comprises the steps: collecting various monitoring data of each phase of each key node of a power distribution area in real time; obtaining each sub-time period of each monitoring data of each phase; acquiring a change correlation value and a deviation change characteristic value of various monitoring data of each phase in each sub-time period; comparing the deviation change characteristic values of various monitoring data between each phase and each of the other phases of the key node where the phase is located so as to obtain a dynamic change factor of the various monitoring data of each phase at each moment and obtain an influence weight and a voltage characteristic value of each phase of each key node at each moment; and compensating the voltage of the power distribution area based on a controllable series compensation technology. According to the method, the trigger angle in the voltage compensation process is accurately determined by accurately evaluating the voltage deviation of each key node, and the accuracy of voltage compensation of the power distribution area is improved.

The invention relates to a direct-hanging type energy storage inverter power module SOC equalization control method and hardware suitable for an unbalanced output current working condition, and the method comprises the steps: carrying out the state sensing of a power grid, carrying out the positive and negative sequence separation based on a double-dq coordinate system, and obtaining the amplitude and phase information of current and voltage components; generating a three-phase basic voltage reference value meeting the power demand of the power grid based on the deviation between the decoupled current component and the current instruction; according to the unbalanced working condition parameters of the power grid and the charge state difference of each phase of battery, the zero-sequence voltage injection amount required by inter-phase equalization is calculated; calculating the voltage compensation amount of each power module according to the charge state difference of each power module in the same phase; synthesizing the three-phase basic voltage reference value, the zero-sequence voltage injection quantity and the voltage compensation quantity of each power module to generate a modulation signal of each power module; a switch control signal is generated through pulse width modulation, and inter-phase and intra-phase adaptive SOC equalization control is realized; hardware is implemented based on the method.

The invention discloses an island micro-grid control method and system based on adaptive virtual impedance droop control. The island micro-grid control method comprises the steps that active power and reactive power output by an inverter are measured in real time; inputting the active power and the reactive power into an improved droop controller, and generating a frequency reference value and a voltage amplitude reference value; calculating a difference value between the reactive power and a reference value, and dynamically adjusting the size of virtual impedance through an integral controller; adding the voltage amplitude reference value and the voltage compensation amount to obtain a voltage amplitude instruction, and adding the frequency reference value and the frequency compensation amount to obtain a frequency instruction; performing voltage synthesis by using the voltage amplitude instruction and the frequency instruction to generate a voltage reference value under a dq coordinate system, taking the voltage reference value as reference input of a double closed-loop control system, driving an inverter bridge after SPWM modulation, and regulating and controlling the output voltage; the system stability and reliability can be improved, reactive power loss and circulation can be reduced, the electric energy quality can be improved, and the load change coping capacity of the micro-grid can be enhanced.