975 results about "Power factor" patented technology

The invention relates to the technical field of online calibration, in particular to a multi-parameter fusion intelligent electric energy meter online calibration method and system, and the method comprises the following steps: collecting voltage waveforms, current harmonics and active power data, dividing windows, calculating a covariance matrix, and generating a feature set; a power factor curvature extreme value and a temperature inflection point offset are analyzed to generate an interference identifier, current density distribution and a voltage distortion spectrum are jointly analyzed to extract a harmonic energy ratio to generate a feature vector, and phase compensation is performed on a pulse sequence to generate a calibration instruction set. According to the method, the covariance matrix is constructed by synchronously collecting voltage and current power parameters, the abnormal mark section is generated by combining the temperature change and the covariance difference value, the environment disturbance and the real deviation are effectively distinguished, and the temperature hysteresis effect is identified through the power factor curvature extreme value and the temperature inflection point offset. And combining current density and voltage distortion spectrum analysis to extract a fundamental wave and harmonic wave energy ratio, establishing a composite calibration reference, and dynamically adjusting a pulse duty ratio to realize harmonic wave energy compensation.

The invention provides a single-tube boost PFC circuit control method and system for single-cycle control, and relates to the technical field of data processing, and the method comprises the steps: generating a self-adaptive PWM control signal according to a duty ratio adjustment amount and a frequency compensation factor, and dynamically limiting the pulse current amplitude of a power switch tube through a peak current prediction algorithm, a load current change rate is generated based on the real-time relevance between the pulse current amplitude and the load current; setting a first monitoring point in a dynamic duty ratio change path of the PWM control signal, and extracting a duty ratio change rate and a switching frequency fluctuation parameter in real time; setting a second monitoring point in a feedback path of a load current change rate, and extracting a load current slope characteristic and a transient change amplitude in real time; and based on the parameters of the first monitoring point and the second monitoring point, generating a correction factor through a dynamic response correlation model. According to the invention, a high power factor can be realized under wide input voltage and load fluctuation.

The invention provides a frequency converter dynamic fault diagnosis method and system based on a multi-brand load test platform. According to the method, multiple real-time operation parameter sets are acquired, the amplitude attenuation threshold and the frequency fluctuation interval of a voltage waveform fragment are dynamically adjusted according to a load mode configuration file, the dynamic voltage reference parameter corresponding to the current load mode is generated, and then the actual waveform and an expected current phase curve are compared frame by frame; the method comprises the following steps: firstly, calculating to obtain a phase offset, then constructing a multi-dimensional operation characteristic spectrum, then carrying out time sequence cross validation on a sudden change time node of a power factor jump trajectory and an abnormal waveform position in a harmonic distortion incidence matrix, outputting an abnormal mode code, and finally, matching a load adaptation grade constraint condition to generate a diagnosis report; according to the technical scheme provided by the invention, the fault diagnosis precision and the cross-brand system adaptation capability in a complex load scene are remarkably improved, and the problem of misjudgment of a single brand threshold rule in a multi-device scene is effectively solved.

The invention relates to the technical field of power electronics, in particular to a control method for a low-voltage intelligent reactive compensation system of a submerged arc furnace. Comprising the following steps: acquiring three-phase voltage, current, power factor, harmonic content and temperature parameters of the low-voltage side of the submerged arc furnace through a sensor network; the load fluctuation of the submerged arc furnace in the future 1-5 minutes is predicted based on a deep learning algorithm, and a compensation demand pre-judgment value is generated; according to a load prediction result and a real-time working condition, performing dynamic switching from three modes of fixed compensation, grouped switching and continuous adjustment; harmonic component dynamic tracking compensation is carried out by combining an active power filter (APF) and a static var generator (SVG); the system overvoltage, overcurrent and temperature parameters are monitored in real time, and a grading protection mechanism is triggered and fed back to the compensation strategy adjusting module. The invention provides a control method for a low-voltage intelligent reactive compensation system of a submerged arc furnace so as to improve the response speed of the system, prolong the service life of equipment and guarantee the electric energy quality of a power grid.

The invention discloses a micro-grid power control method, system and device based on fuzzy modulation and a storage medium, and relates to the technical field of intelligent grid integration of a photovoltaic system and a micro-grid, and the method comprises the steps: firstly obtaining the real-time power data of a photovoltaic system, carrying out the control processing through fuzzy logic, and calculating a reference instruction; according to the reference instruction, hysteresis time is dynamically adjusted through modulation hysteresis control, and an inverter switching signal is generated; converting direct current into alternating current based on the switching signal and a power switching device, injecting the alternating current into the micro-grid, calculating active and reactive power reference values, ensuring that the system operates according to a unit power factor, and giving active power to the reference value; according to the method, the power control precision and adaptability of the micro-grid are improved, excessive switching of the inverter is avoided, loss is reduced, the service life is prolonged, power matching and stable transmission are achieved, reactive loss is reduced, bus voltage is stabilized, harmonic waves can be reduced, the electric energy quality is improved, and efficient and stable operation of the micro-grid is guaranteed.

The invention discloses a flexible control method for new energy grid connection, and relates to the technical field of new energy grid connection control. The method comprises the steps of obtaining grid-connected point electrical parameters through a self-measurement mode or a communication interface mode, performing harmonic feature extraction and compensation based on a deep learning network, and adopting a state estimation method to fuse multi-source data to estimate power grid parameters; and constructing a multi-objective optimization function including voltage quality, a power factor and harmonic suppression, dynamically adjusting a weight coefficient of the optimization function by using a swarm intelligence algorithm, and realizing inverter switching sequence optimization through multi-objective model prediction control. Through a dual-mode communication redundancy mechanism and local intelligent control, while a communication function of a traditional main link is reserved, a standby wireless communication link is introduced to realize real-time backup transmission of a control instruction, and through a local autonomous decision-making capability, the problem of control failure caused by a communication problem in a traditional scheme is fundamentally solved.

The invention relates to the technical field of power system monitoring, and provides a power grid data fault diagnosis method and device based on an intelligent power monitoring instrument, and the method comprises the steps: collecting the operation data of a power grid through the intelligent power monitoring instrument, and generating a fault feature vector containing the multi-dimensional feature parameters of voltage, current and power factor; matching and comparing the feature vector with a preset fault criterion; determining a specific fault type based on a comparison result of the characteristic parameters and a threshold value, including identifying voltage abnormity through a voltage deviation rate, identifying harmonic exceeding through a current harmonic total distortion rate, and identifying a three-phase imbalance fault through a three-phase imbalance degree; for judgment of the three-phase unbalance degree, mean square error statistic calculation is adopted, and a safety coefficient is introduced for threshold comparison; and the fault influence priority is evaluated by quantifying the degree of deviation of each characteristic parameter from the threshold. The fault diagnosis efficiency and reliability can be improved, and intelligent decision support is provided for safe operation of a power grid.

The invention relates to the technical field of energy efficiency monitoring, in particular to a load and energy efficiency monitoring method and system for a four-fusible integrated terminal, and the method comprises the steps: taking any historical sampling moment except the historical sampling moment as a comparison moment at the historical sampling moment which belongs to the same time point as the current sampling moment in any historical period; according to the data correlation degree between the historical sampling moment and the comparison moment in each historical period, obtaining the correlation reference credibility between the historical sampling moment and the comparison moment; obtaining the correlation reference credibility between the historical sampling moment and each comparison moment, and obtaining the abnormality early warning index of the power factor at the current sampling moment in combination with the data correlation degree between the current sampling moment and each comparison moment in each historical period, so as to carry out the abnormality monitoring and early warning of an electrical system. Accurate identification and early warning of power factor abnormity under dynamic load change are realized.

The invention discloses a method and system for testing the electrical performance of a semiconductor chip, and the method comprises the steps: building a mapping relation between dielectric loss and loss frequency through obtaining the dielectric loss data, internal material characteristics and dynamic load power factors of the chip under each frequency band, recognizing a loss abnormal region, and analyzing the influence of the loss abnormal region on the performance of the chip; correcting test data by adopting a minimum mean square error algorithm, and optimizing the impedance of the power supply network and the dynamic switching characteristic of a functional module; calculating the breakdown voltage distribution of each layer in the chip, identifying a high-voltage risk region, optimizing the voltage distribution by using a gradient descent algorithm, and dynamically adjusting the working voltage and current; power factor fluctuation is analyzed through a sliding window algorithm, an abnormal area is identified, a power factor is optimized through a PID algorithm, and the working state and transient response of a chip in a dynamic load are improved. According to the method, the problems of nonlinearity of high-frequency dielectric loss, non-uniform breakdown voltage distribution and unstable power factor response under a dynamic load are solved, and comprehensive and accurate evaluation and optimization of chip performance are realized.

The invention relates to the technical field of electric power engineering automation, in particular to a low-voltage equipment power factor automatic adjusting system and method based on end compensation, and the system comprises a load monitoring module, a compensation strategy generation module, an end compensation execution module, a dynamic balance correction module and an effect evaluation module. According to the invention, the sequential relationship between the load fluctuation and the compensation demand can be accurately identified by continuously monitoring the current waveform, the voltage waveform and the phase difference change trend of the low-voltage equipment, and the compensation strategy is dynamically formulated in combination with the response duration and the compensation demand matching rule, so that the compensation response agility and the matching property of the fluctuating load are improved; dynamic scheduling is carried out according to the capacitor switching capacity and the combination relation in compensation execution, switching weight configuration is analyzed and optimized through the power factor change rate before and after compensation and the load synchronization characteristic, the dynamic balance of the compensation process is enhanced, the power factor stability and the load fluctuation matching capacity after compensation are effectively improved, and the compensation efficiency is improved. And the adaptability and continuity of the adjusting effect are enhanced.

The invention relates to a coordination method and device for harmonic suppression and reactive power compensation in a power distribution network. The method comprises the steps of obtaining power grid operation parameter information of a power distribution network; according to the power grid operation parameter information, the total current harmonic distortion rate, the power factor and each harmonic current information of the power distribution network are detected; detecting to-be-optimized parameters of the power distribution network according to the total current harmonic distortion rate, the power factor and the current information of each harmonic, the to-be-optimized parameters including at least one of each harmonic and reactive power; and according to the to-be-optimized parameters, suppressing each harmonic in the power distribution network and compensating reactive power in the power distribution network. The method can accurately perform cooperative control on harmonic suppression and reactive power compensation in the power distribution network.

The invention discloses an optimized operation method and system for a network-constructed converter. The minimum voltage amplitude deviation of a common coupling point, the maximum new energy power generation power, the maximum network-side power factor and the minimum line loss serve as nonlinear multiple targets in optimized operation of the network-constructed converter. The non-linear multi-target constraints comprise a common coupling point voltage constraint, a network side minimum power factor constraint, a converter output current constraint, a converter apparent power constraint, a photovoltaic output constraint and an energy storage state constraint; according to the priority of each target, determining a target function and a constraint condition of each priority target; according to the priority order, the optimal solutions of the target functions of the priority targets under the constraint condition are solved in sequence, and the optimal solutions serve as input data of the proxy model; and according to the output data of the agent model, optimizing the operation of the network construction type converter. Cooperative control of convergence speed, global optimization capability and dynamic adaptability is considered, and power supply quality and operation efficiency of an active power distribution area are improved.

The invention discloses a variable frequency driving device energy recovery control system based on direct power supply of a high-voltage power grid, and relates to the technical field of electrical transmission and energy recovery control. Updating the power grid impedance model in real time by using a complex impedance calculation method; load operation state parameters are dynamically adjusted in combination with motor end output power, rotating speed change and torque calculation; according to the method, regenerative energy is accurately calculated, a feedback path is adjusted according to voltage fluctuation and frequency deviation of a power grid, a feedback current fluctuation ratio and a power factor are monitored, a feedback path conduction proportion is optimized in real time, when the current is unstable or the power factor is abnormal, a suboptimal path is automatically switched, and continuous and stable operation of a system is guaranteed; according to the invention, the energy feedback efficiency and the power grid compatibility of the high-voltage power grid variable-frequency driving device are effectively improved, and the method is suitable for energy feedback application of a high-power motor driving system.

The invention relates to an electrical variable adjustment monitoring method and system for a distribution box, and the method comprises the steps: collecting the current, voltage, power factor and other core electrical variables of each distribution box in a region in real time, triggering an abnormal mark through dynamic gradient analysis, and recording time-space information; performing space-time correlation analysis based on the power distribution network topological graph, calculating an abnormal time concentration ratio and a spatial distribution density, and generating a correlation circle; determining a fault type (a local problem or an overall power grid problem) according to the characteristics of the associated circles, the number of branch lines and the change of electrical variables, and matching a corresponding processing scheme; and continuously monitoring a fault processing result, and generating a repair report until the system is stable. The system comprises a core electric variable real-time acquisition module, a power distribution network topological graph analysis module, a fault type judgment module and a fault processing monitoring module. According to the method, the anomaly detection accuracy and the fault processing efficiency are improved, and reliable operation of the power distribution network is guaranteed.

The invention belongs to the technical field of power electronics, and relates to an energy feedback high-power-factor air conditioner compressor driving system. Comprising a direct-current bus, a direct-current bus electrolytic capacitor, a motor driving circuit, a shutdown energy feedback circuit, a permanent magnet synchronous motor and a motor control module, wherein the two ends of the direct-current bus electrolytic capacitor are connected with the positive electrode and the negative electrode of the direct-current bus respectively; in the energy feedback control module for driving the combined switch device in the shutdown energy feedback circuit, the motor driving circuit and the shutdown energy feedback circuit, the second connecting end I of each phase of bridge arm is connected with the positive electrode of the direct-current bus, and the second connecting end II of each phase of bridge arm is connected with the negative electrode of the direct-current bus; the first connecting end of the phase bridge arm of the shutdown energy feedback circuit is connected with the phase power grid voltage through the phase filter inductor. The method can maintain the stability of the DC bus voltage, and reduces the influence of the power grid voltage fluctuation and the air conditioner compressor load fluctuation.

The invention discloses a comprehensive management system for intelligent power distribution, and the system comprises a sensing layer which is provided with a plurality of sensors, the sensors are disposed on power distribution equipment, and are used for collecting the operation data of a power distribution system in real time, and the operation data comprise a current I, a voltage U, a power P, an equipment temperature T, a power factor cos phi, and an insulation resistance R; the transmission layer is used for transmitting the operation data to a data layer; the data layer is used for preprocessing the operation data to generate standardized data, and preprocessing comprises data cleaning and normalization conversion; and the application layer comprises a fault early warning module, a predictive maintenance module, an energy consumption analysis module and a remote control module, and the application layer realizes collaborative management by calling the standardized data. Multi-dimensional data fusion, a dynamic intelligent algorithm and a module interaction mechanism are introduced, and full-process intelligence of power distribution management is achieved.

The invention relates to the technical field of power electronic control, and provides a soft start control method for a three-phase PFC (Power Factor Correction), a PFC controller and a power supply system.The soft start control method comprises the steps that when a PFC start instruction is received, an initial target voltage value is set as an actual value of current bus voltage; maintaining the initial target voltage value for a first preset duration; after the initial stable state, sampling in real time to obtain the actual value of the current bus voltage, and calculating the absolute value of the voltage difference between the actual value of the current bus voltage and the current target voltage value; judging whether the absolute value of the voltage difference is smaller than or equal to a preset trigger threshold value; if yes, adding a preset voltage step value to the current target voltage value; if not, keeping the current target voltage value unchanged; and recursive control of the current bus voltage is executed circularly until the updated current target voltage value reaches the final target voltage value. According to the mode, the starting rapidity and the stability of the boosting process are balanced.

The utility model relates to the technical field of magnet power supplies, and discloses an external superconducting magnet power supply, which comprises a plurality of power supply modules connected in parallel, the input end of each power supply module is electrically connected with a power grid, the output end of each power supply module is electrically connected with an external superconducting magnet, and the plurality of power supply modules connected in parallel are used for jointly supplying power to the external superconducting magnet; wherein the power supply module comprises a switching power supply sub-module which is electrically connected with a power grid and is used for converting alternating current of a first voltage level input by the power grid into high-frequency alternating current of a third voltage level; and the linear adjusting tube is electrically connected with the switching power supply sub-module and the outer superconducting magnet, and is used for converting the direct current of the third voltage level into direct current of a fourth voltage level and inputting the direct current of the fourth voltage level into the outer superconducting magnet. According to the utility model, through the switching power supply sub-module and the linear adjusting tube, the power factor and the energy utilization rate can be improved, the harmonic wave is small, the power grid is not polluted, and the stability of the output voltage is ensured.

The invention provides a method and a system for evaluating, regulating and controlling operation stability and electric energy quality of an active transformer area based on edge calculation. The operation information such as low-voltage side voltage and current is collected through the area side edge calculation terminal, the indexes such as the load rate, the power factor, the three-phase unbalance degree, the voltage deviation and the voltage harmonic distortion rate are calculated, and the operation stability and the electric energy quality of the area are comprehensively evaluated after scoring according to a preset rule. And a distributed power supply, an energy storage device and a reactive power compensation device in the transformer area are regulated and controlled according to an evaluation result, so that the operation stability and the electric energy quality are improved. The method can comprehensively reflect the operation stability and the electric energy quality of the transformer area, and is beneficial to improving the operation stability and the power supply quality.

The invention discloses an electric carbon coupling carbon flow calculation method, system and device and a medium. The method comprises the steps of obtaining a real-time power curve of a power transmission line and corresponding current, resistance and power factor multi-source operation data; segmenting the real-time power curve according to a time window, and extracting a power dynamic feature set in each time period based on a current change trend; calculating the energy loss of the power transmission line in each time period according to the multi-source operation data, and generating a carbon emission factor calibration result in combination with the difference between a reference carbon emission factor and the energy loss; determining a carbon flow attribution result of each power generation node in each time period based on the carbon emission factor calibration result and a power factor curve of the power generation node; and calculating a comprehensive carbon flow value of each power generation node, and summarizing to obtain a carbon flow calculation result of the power system. According to the method, the real-time performance, the accuracy and the physical consistency of carbon flow calculation are remarkably improved.

The invention discloses a smooth DPWM modulation method for realizing the optimal efficiency in a full power factor range, and the method comprises the steps: S10, carrying out the calculation of a three-phase current obtained through sampling and a given three-phase reference voltage, and obtaining a power factor angle; s20, judging the range of a power factor angle, and determining the size of a phase shift angle; s30, performing phase shift on the three-phase reference voltage to obtain a three-phase phase shift voltage; s40, the maximum value, the intermediate value and the minimum value of the three-phase phase shift voltage are obtained through calculation; s50, according to the size of the phase shifting angle theta, determining whether the phase shifting angle theta needs to be multiplied by a coefficient 2 or not; s60, calculating the maximum value and the minimum value of the three-phase reference voltage; s70, judging whether the absolute value of the maximum value of the three-phase phase shift voltage is greater than the absolute value of the minimum value of the three-phase phase shift voltage, and assigning the initial zero sequence voltage as 1-vmax or-1-vmin; s80, further judging the magnitude of an intermediate value between the zero-sequence voltage and the negative three-phase phase shift voltage, and further assigning the zero-sequence voltage as-vxmid, 1-vmax or-1-vmin; and S90, injecting the zero-sequence voltage into the three-phase reference voltage to obtain a three-phase modulation voltage.

A circuit interrupter is structured to electrically connect between a power source and a load. The circuit interrupter includes: separable contacts; an actuator coupled to the separable contacts and structured to open or close the separable contacts; a current sensor structured to sense current flowing through the circuit interrupter to the load; a communication module communicatively coupled to at least one of a cloud server and a user device and structured to transmit and receive data; and a controller coupled to the sensor, the actuator, and the communication module, the controller comprising at least one of a fault detector and a look-up table, the fault detector structured to detect and classify a fault, the look-up table comprising at least reference data associated with previous normal cycles, the reference data including at least power factors, closing angle ranges and fault classification categories.

The invention relates to the technical field of switching power supplies, and discloses a quasi-single-stage AC-DC converter based on a three-active-bridge structure. The three-active bridge structure comprises a first port, a second port and a third port; the first port is connected with an alternating current power supply and serves as an alternating current voltage input end of the AC-DC converter; the second port is connected with an external load and serves as a DC voltage output end of the AC-DC converter; the third port is reversely connected in series with the first port and is used for outputting a constant direct-current voltage with constant bias to the first port so as to convert an alternating-current voltage input into the first port into a sinusoidal voltage with bias, or outputting a sinusoidal voltage with variable bias to the first port so as to change the amplitude of the alternating-current voltage input into the first port so as to convert the alternating-current voltage into the sinusoidal voltage with bias; therefore, the number of times of electric energy conversion can be reduced, the overall working efficiency of the power supply is improved, the zero-crossing distortion of the input current at the network side is eliminated, and the power factor and the quality of the electric energy at the network side are improved.

The invention discloses an anti-countercurrent control method and system for an energy storage transformer driven by bidirectional power regulation, and relates to the technical field of anti-countercurrent control of transformers, and the method comprises the steps: collecting the active power of a gateway ammeter, the active power of a load, the capacity of a transformer and a power factor of a power grid power supply grid-connected point in real time, and constructing a real-time operation data set; energy storage discharge countercurrent risk identification is carried out, segmented discharge is triggered to reduce protection, and segmented power adjustment is carried out in the discharge direction; according to the real-time operation data set, overload risk identification of the energy storage charging transformer is carried out, segmented charging demand reduction protection is triggered, and segmented power adjustment is executed in the charging direction. The technical problems that in the prior art, countercurrent is likely to happen during discharging of the energy storage transformer, overload is likely to happen during charging, and consequently equipment operation is not safe and a power grid is not stable are solved, and the technical effect that the operation safety of the energy storage transformer and the stability of the power grid are improved through the segmented power adjustment and power slow rising strategy is achieved.

The invention provides an electric energy quality treatment method, system and device based on a charging pile and a medium, and belongs to the technical field of charging piles, and the method is realized through the following steps: employing a mutual inductor to collect three-phase voltage / current; a common analog sampling and DSP processing circuit; harmonic / reactive power is identified based on the instantaneous reactive power theory, and a compensation instruction is generated; according to the compensation control instruction, driving an active filtering inverter circuit to inject compensation current into a power grid so as to reduce the total harmonic current content and improve the power factor; and the main controller generates charging state data according to the sampled voltage signal and current signal, and couples the data to an alternating current power line for transmission through the power line carrier communication module. The system guarantees the quality of the power grid, achieves the high efficiency and reliability of the operation of the charging pile, and gives consideration to the safety of the power grid and user experience.

The invention discloses a primary and secondary fusion ring main unit fault positioning communication method and system, and relates to the technical field of power system fault positioning, and the communication method comprises the specific steps: S100, multi-source parameter cooperative collection: collecting the parameters of current, voltage and power factor of each loop through an electronic multifunctional sensor arranged in a ring main unit, meanwhile, an intelligent electric meter with a communication function and a wireless data acquisition terminal based on the Internet of Things technology are utilized to obtain operation parameters of flexible loads of the charging pile and the air conditioner cluster, and data are transmitted to a server to be subjected to format conversion and abnormal value elimination; according to the invention, through a multi-source parameter collaborative acquisition technology, real-time and accurate acquisition of key parameters of current, voltage and power factors of each loop of the ring main unit is realized, and at the same time, the operation parameters of the flexible load are comprehensively monitored by combining an intelligent electric meter with a communication function and an Internet of Things technology wireless data acquisition terminal. And the comprehensiveness and accuracy of data acquisition are improved.

The application discloses a kind of method and detection system of calculating elevator balance coefficient, comprising: the three-phase voltage value and two-phase current value of three-phase motor are collected, and the voltage phase angle value under voltage resultant vector and line voltage effective value in two-phase αβ coordinates are calculated based on three-phase voltage value and two-phase current value;Current phase angle value and line current effective value under current resultant vector;Elevator car operating speed and elevator car running distance are calculated based on voltage phase angle value;Power factor is calculated based on voltage phase angle value and current phase angle value;Elevator car passes through the moment of elevator balance position based on elevator car running distance, and elevator balance coefficient is calculated based on the running data when passing through elevator balance position.The application calculates the moment of elevator car passing through elevator balance position by three-phase voltage value and two-phase current value and the running distance of elevator car, and elevator balance coefficient can be quickly and accurately calculated based on the running data when passing through elevator balance position.

The invention relates to the technical field of switching power supplies, in particular to a stroboflash-free high-power-factor single-stage switching power supply. The output module is electrically connected with the control module through the dynamic voltage detection module; the control module receives the dynamic voltage signal from the output module; the control module is electrically connected with the input module through the dynamic voltage regulation module and the primary side feedback module in sequence; the control module generates an adjusting signal according to the dynamic voltage signal and controls on or off of the dynamic voltage adjusting module, the adjusting signal is fed back to the input module through the primary side feedback module, and the input module adjusts the dynamic voltage signal generated by the output module; the control module is electrically connected with the output module through the current chopping adjusting module. The control module generates a chopping signal according to the received dynamic voltage signal, and the chopping signal drives the current chopping adjusting module to carry out chopping on the dynamic voltage signal generated by the output module; the problem that the output current ripple of a high-power-factor single-stage switching power supply is large is solved.

The invention discloses an electric energy quality loss test method, system and device and a medium. The method comprises the following steps: acquiring three-phase voltage data and three-phase current data; calculating the equivalent total loss power in the power distribution network line through the apparent power value, the voltage and the resistance based on the collected voltage and current data; and based on the equivalent total loss power, in combination with the power factors of different line losses, carrying out line loss subentry decoupling to obtain additional line losses caused by different electric energy quality problems. According to the invention, extra loss of the line caused by electric energy quality can be accurately measured, and line resistance does not need to be measured.

The single-phase bidirectional single-stage isolation matrix converter comprises a pre-stage circuit and a post-stage circuit, and the pre-stage circuit comprises an LC filter on the power grid side, a pre-stage single-phase matrix conversion circuit and an LLC resonance circuit with a high-frequency transformer; the post-stage circuit comprises a post-stage conversion circuit and an output filter capacitor; the front-stage single-phase matrix conversion circuit comprises four bidirectional switch assemblies of a full-bridge structure. Each bidirectional switch assembly comprises two unidirectional controllable MOS tubes which are reversely connected in series, one end of each bidirectional switch assembly is connected to an L line or an N line of a power grid, and the other end of each bidirectional switch assembly is connected to the LLC resonance circuit. The rear-stage conversion circuit comprises a bidirectional MOS (Metal Oxide Semiconductor) tube bridge circuit and three high-frequency transformer secondary windings which are in triangular connection or star connection; and two end points of each secondary winding are respectively connected to the upper MOS tube and the lower MOS tube of the corresponding bridge arm and then are connected to output positive and negative ends. The converter has the advantages of high power density, low current harmonic, high power factor and the like, and is small in size, strong in anti-interference capability, wide in buck-boost range, and safe and reliable in commutation.