20 results about "Voltage flicker" patented technology

The invention discloses a dynamic voltage restorer system based on storage battery-supercapacitor hybrid energy storage, and relates to the technical field of power control, the system comprises a connection interface module, a detection control module, a hybrid energy storage module, a DVR main body module and an energy storage mode management module; according to the method, voltage and current data of a power distribution network and a load are collected in real time, voltage flicker occurrence is accurately judged through a voltage flicker perceptibility coefficient formula, a corresponding energy distribution instruction and a corresponding voltage compensation instruction are generated, and according to the energy distribution instruction, through a hybrid energy storage energy distribution coefficient formula and a charging and discharging power constraint formula, the charging and discharging power of the power distribution network is calculated. The energy output of the storage battery and the supercapacitor is intelligently allocated, it is ensured that needed compensation energy can be rapidly provided during voltage fluctuation, compensation voltage is calculated and output through a DVR compensation voltage calculation formula based on direct-current electric energy, voltage flicker is effectively stabilized, and the electric energy quality of a power distribution network is improved.

The embodiment of the invention discloses a power station voltage flicker signal analysis method and a related device. The method comprises the steps of collecting three-phase voltage data of a target power station grid connection point; decoupling the three-phase voltage data to obtain a voltage modal component; calculating an amplitude domain of a voltage flicker signal of the target power station according to the voltage modal component; according to the amplitude domain, the fluctuation entropy and the total fluctuation quantity of the voltage flicker signal are determined, and the fluctuation entropy is used for representing the fluctuation intensity of the voltage flicker signal. Thus, by decoupling the three-phase voltage of the power station, interference factors of voltage flicker signals are avoided, the reliability and accuracy of analysis results are improved, and reliable data support is provided for taking reasonable prevention measures and technical means subsequently.

The invention discloses a method and device for identifying a voltage flicker source in a power distribution network based on SVMD-HistGBT, and relates to the field of electric energy quality monitoring, voltage flicker is divided into sine wave modulation type flicker, rectangular wave modulation type flicker and inter-harmonic modulation type flicker according to causes of the voltage flicker, and for the three typical types, the voltage flicker source in the power distribution network is identified. The sampling voltage is split into narrow-band intrinsic mode functions through successive variational mode decomposition, and feature extraction is carried out; and then, constructing a histogram gradient boosting tree classifier to learn three types of flickers, and realizing identification of the voltage flicker source in the high-proportion photovoltaic access power distribution network according to the extracted characteristics of the sampling voltage. According to the invention, different types of flicker signals can be effectively decomposed, so that identification of different voltage flicker sources is completed.

The invention discloses a voltage flicker parameter detection method and module based on a high-order symmetric derivative and a fractional Kaiser window. The voltage flicker parameter detection method and module are used for electric energy quality monitoring. The method comprises the steps that first-order symmetric difference is popularized to high-order symmetric difference on the basis of first-order symmetric difference, a multi-resolution concept is introduced to obtain a multi-resolution high-order symmetric envelope derivative operator with high precision and high robustness, and flicker envelope signals are extracted more rapidly and accurately through the energy operator; then, fractional Kaiser window three-spectral-line improved FFT (Fast Fourier Transform) spectrum correction with two adjustable parameters is adopted for the extracted envelope signal; the method can effectively adapt to single-frequency modulation and multi-frequency modulation environments, can suppress interference of harmonic waves, inter-harmonic waves, fundamental wave frequency fluctuation, phase jump and noise, and is wider in application range in the field of electric energy quality monitoring compared with modules obtained by other energy operators.

The utility model discloses a kind of electric energy quality DNV voltage distortion rate elimination stabilizer and sampling circuit, including load equipment and for the DVA voltage stabilizer on the load equipment, still including with the DVA voltage stabilizer and the load equipment electric connection A circuit, B circuit, C circuit and N circuit.The beneficial effect of the utility model is: through filter current transformer, voltage stabilizer current transformer and DVA voltage stabilizer, realize the process in the use of load equipment, inhibit load equipment dynamic and steady-state voltage drop and voltage variable, eliminate surge, eliminate voltage flicker, with good dynamic voltage stability capacity, output voltage reaches precision ±1% -5% adjustable, can effectively filter each harmonic, three-phase unbalance, improve power factor, improve power supply electric energy quality, and harmonic elimination stabilizer has ideal energy-saving effect, between 1-8% in different field energy-saving effect.

The application discloses a voltage flicker acceleration detection method, a system and a medium, and relates to the technical field of voltage flicker detection.The voltage flicker acceleration detection method comprises the following steps: squaring a voltage signal to be detected to obtain a voltage square signal; calculating the direct current bias of the voltage square signal; subtracting the direct current bias of the voltage square signal from the voltage square signal to obtain an optimized voltage signal; and performing demodulation filtering, visual sensitivity weighting filtering, squaring, smoothing weighting filtering and statistical processing on the optimized voltage signal to obtain a voltage flicker detection result.The application aims to solve the problem of slow convergence speed of the demodulation filtering of the current IEC flicker detection method, which affects the accuracy of flicker detection, and improve the accuracy of detection while ensuring the speed of flicker detection.

The application discloses an active power distribution network voltage control method of energy storage virtual impedance, relates to the technical field of voltage control, and is used for solving the problem of excessive intervention or insufficient intervention of an energy storage system. The energy storage access node in a to-be-tested power distribution network region is called, real-time voltage data of each energy storage access node is collected, voltage diffusion state is analyzed, the energy storage access node in an abnormal diffusion state is marked, voltage flicker data and power flow change data of the marked energy storage access node are detected, an impedance adjustment direction is determined, an impedance adjustment amplitude is calculated, virtual impedance adjustment is implemented on an energy storage inverter, the reactive power output change amount of the energy storage inverter and the voltage out-of-limit subsiding time of the marked energy storage access node are detected, whether to stop the virtual impedance adjustment is judged according to the detection result, voltage rapid support is ensured, excessive intervention of the energy storage system is avoided, and the stability and reliability of active power distribution network voltage control are improved.

The application relates to the technical field of voltage flicker suppression, in particular to a voltage flicker suppression method and device for a new energy grid-connected system. The device comprises a signal acquisition and preprocessing unit for signal acquisition and processing; a characteristic analysis unit for grid parameter characteristic analysis in the grid-connected system; a response time adjusting unit for response time adjustment of grid parameter data under different frequency bands; and a compensation amount calculation unit for determining the priority order of the matching response time by using the energy of the frequency band components. The application aims to efficiently suppress voltage flicker in the grid-connected system and improve the grid voltage quality.

The invention relates to a method and a device for IEC standard voltage flicker correction, and discloses a power supply voltage amplitude A correction method, which can reduce errors introduced by normalization processing of voltage amplitude A. The method can process in real time, does not need to store flicker sampling values within observation time, and greatly saves space. A flicker gain K value correction method is provided, errors introduced by flicker gain K value normalization processing can be reduced, simulation IEC standard modulation signals are used, the flicker gain K value is corrected through the method, and flicker parameters of any voltage signal can be accurately measured only through one-time correction; the corrected amplitude A and flicker gain K are applied to an IEC voltage flicker detection algorithm, and the measurement precision of flicker parameters Pinst, max, Pst and Plt can be remarkably improved.

The application discloses an industrial load regulation method and system based on digital twinning, and belongs to the technical field of power system automation. The method comprises the following steps: collecting real-time and historical data of industrial load, energy storage and new energy; establishing and dynamically updating an industrial load digital twinning model; calculating the adjustable capacity vector of each load unit based on the model; predicting the future power sequence of new energy by using a method based on a wind direction adaptive attention mechanism; calculating the new energy consumption capacity by a dynamic evaluation method considering voltage flicker risk propagation; and generating a load regulation scheme according to the calculation result. The application accurately quantifies the load regulation capacity, improves the power prediction accuracy, and introduces voltage flicker risk evaluation, ensuring the power quality safety of the regulation process, realizing efficient and safe collaborative scheduling of industrial load, and effectively improving the new energy consumption level.

The invention discloses an active power distribution network voltage control method of energy storage virtual impedance, relates to the technical field of voltage control, and is used for solving the problem of excessive intervention or insufficient intervention of an energy storage system. The method comprises the following steps: acquiring real-time voltage data of each energy storage access node and analyzing a voltage diffusion state; marking the energy storage access node in an abnormal diffusion state; detecting voltage flicker data and power flow change data of the marked energy storage access node; determining an impedance adjustment direction and calculating an impedance adjustment amplitude; the reactive output variation of the energy storage inverter is detected, the voltage out-of-limit fading time of the energy storage access node is marked, whether virtual impedance adjustment is stopped or not is judged according to the detection result, excessive intervention of the energy storage system is avoided while rapid voltage support is guaranteed, and the stability and reliability of active power distribution network voltage control are improved.

The invention relates to the field of electric energy metering device detection safety, in particular to an electric energy meter on-site verification safety early warning system and method. The data processing unit is used for converting the signal into digital waveform data; the data analysis unit is used for extracting a characteristic parameter set of risk early warning; the hierarchical interrupt control unit is used for generating a hardware interrupt signal representing a risk level when detecting that a risk condition is met; the main control unit is used for receiving the hardware interrupt signal and starting a response program according to the risk level; the early warning recording unit is used for outputting risk warning information; characteristic parameters such as fundamental waves, harmonic waves, voltage flicker and current change rate are extracted through a data analysis unit; the hierarchical interrupt control unit carries out data comparison and generates interrupt signals corresponding to risk levels, the main control unit drives the early warning recording unit to output hierarchical warning information, and the early warning system can trigger targeted early warning at the initial stage of PT / CT abnormity and supports operation disposal and afterwards tracing.

The invention belongs to the technical field of electronic power, and particularly relates to an SVG compensation system and method based on reactive power closed loop and cloud collaboration, the system comprises a high-voltage side acquisition unit, a low-voltage side static var generator and a cloud platform, and the acquisition unit acquires and uploads high-voltage side real-time reactive power and harmonic data; the cloud platform calculates target reactive power based on the data and a preset power factor target value, and solves a multi-target optimization problem in a rolling manner through a model prediction control algorithm based on a discrete state space model by taking the deviation between a real-time value and the target value as a core control quantity and combining voltage and harmonic suppression requirements; generating a collaborative compensation instruction meeting the equipment and security constraints and issuing the collaborative compensation instruction to the SVG for execution; and after the SVG performs execution, new data is fed back to the cloud for adaptive updating of model parameters. According to the system, rapid and accurate linkage between high-voltage side sampling and low-voltage side compensation is ensured, and the problems of mistaken adjustment and voltage flicker frequently occurring in a traditional high-voltage sampling and low-voltage compensation scheme are solved.

This invention discloses a voltage flicker identification method and apparatus based on ER-VMD adaptive decomposition and Inception-ResNet, relating to the field of power quality monitoring. The method includes: acquiring voltage signals from a distribution network; performing adaptive variational mode decomposition on the voltage signals to obtain multiple intrinsic mode components (IMFs); constructing time-frequency domain features based on the multiple IMFs; inputting the time-frequency domain features into a pre-trained Inception-ResNet network incorporating a convolutional block attention module (CBAM), and outputting the voltage flicker type identification result corresponding to the voltage signal. This invention effectively integrates the advantages of adaptive time-frequency decomposition and deep feature learning, achieving accurate and rapid identification of flicker of different modulation types, providing a reliable technical approach for online monitoring and intelligent diagnosis of power grid power quality.

The invention discloses a voltage control method and device of a network construction type converter, a storage medium and equipment. The method comprises the following steps: constructing an operation cost optimization function of a long-term optimization layer of the power distribution network; based on the photovoltaic output prediction curve and the load prediction curve of each node in the power distribution network, solving an operation cost optimization function, and obtaining a voltage reference value of each network-forming converter in a future preset time period; according to the local voltage of each network construction type converter and the voltage of other converters adjacent to each network construction type converter, respectively adjusting the droop coefficient of each network construction type converter in a middle-term balance layer of the power distribution network; constructing a droop control equation of a real-time compensation layer of the power distribution network; and solving a droop control equation based on the voltage reference value of each grid-forming converter and the adjusted droop coefficient to obtain reactive power of each grid-forming converter so as to suppress voltage flicker and oscillation. According to the invention, voltage fluctuation can be effectively suppressed below a threshold value, and voltage out-of-limit is avoided.

The invention discloses a harmonic wave and voltage flicker cooperative suppression system and method for integrated energy. The system comprises a signal acquisition unit, a harmonic detection module, a voltage flicker evaluation module, a cooperative control center, a harmonic suppression device and a flicker suppression device. The system collects power grid signals in real time, carries out harmonic analysis and flicker evaluation respectively, and generates a coordinated control instruction based on a multi-target decision model by using a coordinated control center, thereby realizing the coordinated operation of harmonic suppression and dynamic reactive compensation. The method can effectively suppress harmonic waves and voltage flicker, avoids equipment action conflicts, improves the treatment efficiency and the system stability, and is suitable for a comprehensive energy system with high-proportion new energy access.

The present application belongs to the technical field of electronic power, and particularly relates to an SVG compensation system and method based on reactive power closed loop and cloud cooperation, which comprises a high-voltage side acquisition unit, a low-voltage side static var generator and a cloud platform. The acquisition unit acquires real-time reactive power and harmonic data of the high-voltage side and uploads the data. The cloud platform calculates target reactive power based on the data and a preset power factor target value, takes the deviation between the real-time value and the target value as the core control quantity, combines voltage and harmonic suppression requirements, solves the multi-objective optimization problem through a model predictive control algorithm based on a discrete state space model, generates a cooperative compensation instruction meeting the equipment and safety constraints, and issues the instruction to the SVG for execution. The SVG feeds back new data to the cloud after execution, which is used for adaptive updating of model parameters. The system ensures fast and accurate linkage between high-voltage side sampling and low-voltage side compensation, and avoids the frequent misadjustment and voltage flicker problems in the traditional high-sampling and low-compensation scheme.

The application relates to a DC-DC converter fault detection method and a detection device, which first collects current ripple signals and PWM signals of a direct current converter; secondly, ripple characteristic signals and the PWM signals are subjected to incremental correlation coefficient operation and real-time discrimination of fault diagnosis. The method for detecting faults by taking the current ripple as a monitoring quantity is first proposed, the magnetic coupling device is used to actively collect the ripple, the ripple signals are subjected to characteristic processing operation to generate the ripple characteristic signals, the method is not disturbed by input voltage flicker and fluctuation, the fault detection is accurate, and the effect is obvious in distributed power supply fault detection. Through recursive calculation of a correlation coefficient formula, the incremental correlation coefficient formula is first proposed. The efficiency of the DSP signal processing circuit for the correlation coefficient operation of the signals is improved, and the real-time fault detection is realized. If the incremental correlation coefficient is detected to be suddenly changed, the power supply of the direct current converter is immediately cut off through an execution circuit, and circuit protection is realized.

The invention discloses a flicker parameter estimation method and module based on windowing optimization linear frequency modulation Z transformation, and relates to the field of electric energy quality monitoring. The method comprises the steps that a voltage flicker signal in a power distribution network is acquired; performing envelope extraction on the voltage flicker signal by adopting an improved square detection algorithm to obtain a flicker envelope signal; a Kaiser-Nuttall mixed window function is applied to the flicker envelope signal, linear frequency modulation Z transformation analysis is carried out, and a discrete frequency spectrum is generated; and based on the discrete spectrum, correcting the frequency and amplitude of the flicker parameter by adopting a triplet spectrum interpolation algorithm to obtain a high-precision flicker parameter estimation result. According to the method, accurate extraction of a flicker envelope is realized by improving square detection and analytic modal decomposition, spectrum leakage is inhibited by combining a Kaiser-Nuttall mixed window with linear frequency modulation Z transformation, and finally, high-precision estimation of a module on a flicker amplitude value and a frequency parameter in an electric energy quality monitoring device is realized by combining a triplet spectrum interpolation algorithm.

Embodiments of the present application disclose a control method, device, equipment and computer readable storage medium, the method comprising: obtaining the working power of a heating load and an AC power supply signal to be connected to the heating load, obtaining at least one chopping time meeting a preset condition from the obtained AC power supply signal; performing chopping processing on the AC power supply signal based on the at least one chopping time to obtain at least one chopping signal, determining the power of the at least one chopping signal, determining a target power supply signal based on the at least one chopping signal and the power of the at least one chopping signal, and connecting the target power supply signal to the heating load to heat the heating load. Chopping the AC power supply signal based on the chopping time meeting the preset condition can obtain a chopping signal with low harmonic current and good voltage flicker resistance, so that when the heating load is heated and controlled based on the chopping signal and the power of the chopping signal, the harmonic current and voltage flicker interference value are reduced.