20 results about "Harmonic control" patented technology

The present application belongs to the technical field of power grid harmonic control, and discloses a hybrid active filter collaborative control method, system, device and medium based on golden section optimization, aiming to solve the problems of single function, low capacity utilization rate and poor power grid adaptability. The method first acquires the harmonic voltage signal of the load side of the power grid public connection point and the harmonic current signal of the power grid side, and calculates the capacity utilization efficiency; then a double-channel control architecture is constructed, the first channel generates current-type compensation instructions according to the harmonic current, and the second channel generates resistance-type compensation instructions according to the harmonic voltage; then, taking the maximization of the capacity utilization efficiency as the target, the golden section search algorithm is used to solve the weight coefficients of the two channels in real time; the instructions of the two channels are weighted and superimposed to generate the total harmonic compensation instruction; finally, the hybrid active filter injects compensation current into the power grid. The present application realizes the collaborative governance of double-sided harmonic sources, the improvement of capacity utilization rate and the adaptive adjustment of power grid strength.

The application relates to a continuous inverse class-F power amplifier based on source harmonic phase difference control and belongs to the wireless communication field. The power amplifier uses a special source matching network to control a transistor gate waveform, the source matching network is composed of a DC blocking network, a bias network and a harmonic control network; under the condition of a continuous inverse class-F load impedance, the source matching network designed by the application controls the second harmonic phase difference value of the transistor input end by using a series ladder microstrip line to form a T-shaped structure, so that excellent efficiency can be obtained, the load impedance design space can be expanded, and the complexity of a load matching network can be reduced.

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate, and a class-F amplifier (500) according to an embodiment of the present disclosure may comprise: an input matching network (IMN) (510) including an input harmonic tuning network (511) and an input fundamental matching network (512); a power amplifier (PA) (520) electrically connected to the input matching network (510); and a class-F output matching network (F-OMN) (530) electrically connected to the power amplifier (520).

To provide novel types, structures, and arrangments of capacitor networks for harmonic control and the other purpose.SOLUTION: An integrated device includes: a capacitor network; and one or more power devices. The capacitor network includes: a bond pad; and metal-insulation-metal (MIM) capacitors. The capacitor includes: a first metal layer; a second metal layer; an insulation layer between the first and second metal layers; and one or more substrate penetration vias. The first metal layer is connected to the bond pad, and the second metal layer is connected to a ground plane on a bottom side of a substrate by the vias. A plurality of capacitors for an adaptive electrostatic capacity can be arranged around the bond pad in the capacitor network. A matching network in the integrated device can incorporate the capacitor network to reduce a loss, provides better harmonic termination, and achieve better phase alignment of the power devices.SELECTED DRAWING: Figure 2

The application discloses an inverter adaptive harmonic control method, medium and equipment; the method steps are as follows: real-time sampling of the input voltage of each MPPT branch, and dividing into multiple voltage clusters according to the proximity of voltage amplitude; performing phase coordination on each MPPT branch in the same voltage cluster to obtain a controllable amplitude and direction sub-ripple vector; overall planning the sub-ripple vectors of all voltage clusters, adjusting the intra-cluster and inter-cluster phase relationship of the voltage clusters multiple times through an iterative algorithm, so that each sub-ripple vector gradually offsets each other; generating a modulation signal for driving each MPPT branch according to the optimal phase set output by the iterative algorithm. The medium and equipment are used for implementing the above method. The application has the beneficial effects that: the application performs zoned collaborative control on each MPPT branch, can effectively suppress the ripple influence caused by each MPPT branch on the bus under the condition of unbalanced output voltage, and improves the power quality and equipment life.

The application provides a permanent magnet synchronous motor system deadbeat prediction current harmonic tracking error compensation method, a continuous time state space voltage equation of a permanent magnet synchronous motor is constructed based on a stator voltage equation of the permanent magnet synchronous motor, a current prediction value expression is obtained through solving and merging of free components and forced components of a current analytical solution, a calculation expression of a control quantity is obtained through current reference value replacement based on the current prediction value expression, a current following error expression is obtained based on the calculation expression of the control quantity and the current prediction value expression under consideration of filtering errors, parameter mismatch and control quantity action deviation, fundamental wave control quantity and harmonic control quantity are calculated respectively by using the current prediction value expression, the calculation expression of the control quantity and the current following error expression, and the fundamental wave control quantity and the harmonic control quantity are fused as final control quantity of the permanent magnet synchronous motor. The application improves low harmonic current tracking precision.

This application relates to a method, apparatus, and computer equipment for harmonic mitigation in distribution networks. The method includes: first, for each node in the distribution network, obtaining a risk factor characterizing the degree of harmonic exceedance risk at each node, calculating a risk weighting value; based on this risk weighting value, the worst-case node risk penalty term, and the fixed investment cost of voltage-sensing active power filters at rated capacity and the operation and maintenance cost corresponding to the actual compensation capacity, constructing a comprehensive objective function while setting constraints; using the virtual harmonic conductance of each voltage-sensing active power filter at each node of the distribution network as optimization variables, iteratively solving the constructed comprehensive objective function using an improved sine and cosine algorithm to obtain the optimal values ​​of each virtual harmonic conductance of the voltage-sensing active power filter; and finally, configuring the harmonic conductance parameters of the voltage-sensing active power filters in the distribution network based on these optimal values. This method can accurately and efficiently achieve harmonic suppression and safe and stable operation of the distribution network.

This invention relates to the field of microgrid control technology, and discloses a distributed harmonic control method, device, and multi-inverter system for multi-inverter systems. In this invention, adjacent inverter control units are connected to form a ring network. During harmonic control, the output voltage and output current of the inverter in the inverter control unit are used to separate the fundamental and harmonic components. Based on the obtained fundamental component, the fundamental component of the outer loop reference voltage is calculated. The harmonic power is calculated based on the harmonic current component. Combined with the harmonic power of other interconnected units, a harmonic power sharing controller is calculated to determine the harmonic voltage gain coefficient. Based on this coefficient and the harmonic current component, the harmonic component of the outer loop reference voltage is obtained. The outer loop reference voltage is then calculated, and the control voltage for the corresponding three-phase inverter bridge is obtained from this reference voltage. This invention is unaffected by grid interference and feeder impedance mismatch, compensates for voltage distortion caused by nonlinear loads, and achieves precise harmonic power distribution between the DG (Distributed Generator and Controller).

The application relates to a high-voltage frequency converter digital twin modeling system and method, and belongs to the technical field of digital twin equipment and methods. The technical scheme of the application is that a data acquisition module and a data preprocessing module are connected with each other, and a digital twin modeling module is connected with the data preprocessing module and a component degradation modeling module respectively. The application has the beneficial effects that by constructing a multi-physical-field coupling twin model, the problem of large simulation deviation of a single electrical model under non-ideal working conditions is solved, and the virtual-to-real mapping precision is greatly improved; by embedding a degradation model with a harmonic aging factor, the dynamic updating of model parameters with the equipment state is realized, and the problem of continuous expansion of the deviation of a static model with the running time is solved; by building a health-driven low-harmonic collaborative closed-loop control mechanism, the operation and maintenance and harmonic control are deeply integrated, and the practical value of the system engineering is significantly improved.

Embodiments of the present application provide a kind of power grid harmonic control method, device, equipment and storage medium, involve power system technical field.The method comprises: according to the network architecture information of power system, the load distribution node matrix of power grid is determined;According to the distribution node information of load indicated by the load distribution node matrix, the first voltage distortion rate of the power grid is determined;If it is determined that the first voltage distortion rate does not satisfy the requirement of pre-set limit value, the distribution node information of load included in the load distribution node matrix is optimized, and the updated load distribution node matrix is obtained;According to the updated load distribution node matrix, after the node that the load of the power grid is accessed, power supply is carried out for the load of the power grid, to restrain the harmonic generated by the power grid.The method of the present application can flexibly, efficiently and low cost control the harmonic of power grid, improve the stability and reliability of power system.

The present application relates to a kind of LCL type active power filter composite active damping optimization control method, including inverter side current active damping optimization control and grid voltage active damping optimization control.The beneficial effects of the present application are: the present application obtains the wide active damping boundary close to Nyquist frequency using the inverter side current active damping optimization control based on cascaded resonant controller, and has accurate adjustment ability to fundamental current component, to ensure the stable operation of system when grid impedance fluctuates in a large range.In addition, the present application also uses the grid voltage active damping optimization control based on weighted proportional order reduction generalized integrator, solves the potential instability risk caused by the phase margin reduction of active power filter harmonic control unit due to large grid impedance.In summary, the present application effectively improves the weak grid adaptability of LCL type active power filter.

The application discloses an adaptive compensation method for harmonic treatment of an inverter, collects a current signal on a load side of the inverter, analyzes and processes the current, extracts harmonic information to form a command signal, controls IGBT modules of the inverter to generate harmonic currents with opposite amplitude, frequency and phase to offset the harmonic in the circuit, compares the amplitude and phase of each harmonic of the actual output current and the detected current, and compensates in advance in the command value, introduces an adaptive adjustment mechanism, compares the difference between the output current and the detected current based on the initial compensation, and increases the adjustment step length based on the initial adjustment parameter according to the difference. The amplitude and phase angle of the output harmonic current can be adaptively adjusted, and the DC side voltage stabilization control method is also optimized.

The application discloses a high-efficiency microwave power amplifier design method based on limited harmonic control, which aims at improving the efficiency of the microwave power amplifier by reducing the useless energy of the transistor and increasing the output power of the transistor, and solves the problem of low efficiency of the high-power amplifier.The application takes the power amplifier power distribution mechanism under the limited harmonic condition as the starting point, increases a small amount of second harmonic output energy to reduce more transistor dissipation energy, and makes the voltage waveform fundamental wave and second harmonic out of phase to obtain the maximum fundamental wave component.Meanwhile, the application provides a current waveform which can be used with the above-mentioned voltage waveform, so as to ensure that the fundamental wave / harmonic impedance of the output port is always non-negative, and solves the problem of low efficiency of the high-power amplifier when realizing higher output power.

The application discloses a kind of based on super surface cascade nonreciprocal nonlinear transmission implementation method, it is related to electromagnetic transmission technical field.The method includes:1) gain super surface preparation and nonlinear gain debugging;2) time modulation super surface preparation and harmonic control;3) double super surface cascade establishment;4) nonreciprocal nonlinear transmission control;5) performance verification.The method presented in the application is by time modulation super surface and gain super surface along electromagnetic wave propagation direction space cascade, using the periodic harmonic generation characteristics of time modulation super surface and the nonlinear amplification characteristics of gain super surface, solve the problem of large loss, complex structure, linear response limitation of traditional nonreciprocal transmission implementation method, realize no magnetic bias, amplitude and frequency two-dimensional nonreciprocal transmission, with the advantages of control flexibility, compact structure.

The embodiment of the invention discloses a new energy grid-connected harmonic suppression regulation and control method and device, electronic equipment and a medium. A specific embodiment of the method comprises the following steps: performing variable window Fourier transform on a power instantaneous value sequence set, and then performing impedance compensation to obtain a compensated power harmonic spectrum diagram set; performing critical point identification on the new energy grid-connected power region to obtain a harmonic resonance critical point set; performing early warning grade division on the harmonic resonance critical point set to obtain an early warning grade critical point set; performing harmonic time sequence prediction on the compensated power harmonic spectrogram and the inverter power information to obtain a harmonic prediction amplitude oscillogram; and performing harmonic suppression control on the early warning grade critical point to obtain grid-connected harmonic regulation and control information, and performing equipment regulation and control processing on the power equipment. According to the embodiment, the early warning accuracy of the harmonic resonance risk and the efficiency of suppressing the harmonic resonance can be improved, the equipment delay is reduced, the safety of the new energy grid-connected equipment is improved, and the power loss is reduced.

The application discloses a low-harmonic frequency conversion power supply system and a control method for a rail locomotive air conditioner, relates to the technical field of harmonic control, and determines a harmonic sensitive section by analyzing historical harmonic fault data, determines a plurality of control strategies based on the harmonic sensitive section, starts the locomotive air conditioner, and collects cold start load data of the locomotive air conditioner in real time, pre-processes the cold start load data, and obtains a standard cold start data set, extracts a cold start load index in the standard cold start data set, extracts harmonic trend data, a harmonic trend index and a frequency output function in the standard cold start data set when judging a cold start load abnormality based on the cold start load index, calculates an output comprehensive execution risk value, determines a start risk level based on the output comprehensive execution risk value, selects and executes a corresponding control strategy, and dynamically adjusts a start frequency of the locomotive air conditioner based on the control strategy. The application can greatly improve the start stability of the air conditioner under complex working conditions.

This invention discloses a method for controlling the interharmonic current of a grid-connected photovoltaic (PV) system. The method includes: acquiring data information of the target grid-connected PV system; constructing a continuous state-space model of a three-phase grid-connected PV inverter in a dq rotating coordinate system, considering the influence of interharmonic disturbances; designing an extended state observer for the interharmonic disturbances; constructing an objective function for controlling the interharmonic current of the grid-connected PV system, considering current tracking accuracy, control smoothness, and interharmonic suppression effect; constructing stability constraints based on Lyapunov theory; and solving the constructed objective function according to the established constraints to complete the interharmonic current control of the grid-connected PV system. This invention also discloses a system for implementing the aforementioned interharmonic current control method for the grid-connected PV system. This invention not only achieves the suppression and control of interharmonic current in the grid-connected PV system but also offers higher reliability and better accuracy.

This application provides a method for outputting an electrical pulse of an ultra-long body-shaped harmonic, comprising: receiving a training mode input by a user or calling a preset training mode, and generating a control command; generating a carrier signal, an ultra-low frequency signal, and a low-frequency fundamental wave signal according to the control command; performing frequency matching, phase calibration, and timing latching on the ultra-low frequency signal and the low-frequency fundamental wave signal to form a harmonic control signal; modulating the carrier signal based on the harmonic control signal to form a modulated output signal; performing pass-pass-intercept-DC waveform filtering on the modulated output signal to form an electrical pulse of an ultra-long body-shaped harmonic; and outputting the electrical pulse. By generating a carrier, ultra-low frequency, and low-frequency fundamental wave signals, and modulating and outputting them after frequency matching, phase calibration, and timing latching, and then performing pass-pass-intercept-DC filtering, the output waveform is smooth, continuous, and rhythmic, which can form a long-term stable stimulus, effectively improving the harshness and discomfort of the electrical pulse output, and enhancing the stimulation effect and user comfort.

The application discloses an inverter adaptive harmonic control method, medium and equipment; the method steps are as follows: the aging data of each MPPT branch is calculated, and the basic ripple amplitude weight is calculated according to real-time operation data; a coupling model is constructed, the comprehensive compensation factor of each MPPT branch is calculated in real time, and the maximum weight of each MPPT branch is calculated in combination with the basic ripple amplitude weight; according to the voltage imbalance difference degree of each MPPT branch, the inverter determines the corresponding working mode and dynamically solves the optimal target phase set that makes the ripple minimum in combination with the maximum weight, and phase migration is performed. The medium and equipment are used for implementing the above method. The application has the beneficial effects that by dynamically optimizing the driving phase of each MPPT branch, the voltage imbalance adaptability of each MPPT branch is improved, thereby effectively inhibiting the ripple influence caused by each MPPT branch on the bus under the condition of unbalanced output voltage, and the power quality and equipment life are improved.

The application discloses an inverter adaptive harmonic control method, medium and equipment; the method steps are as follows: real-time sampling of the input voltage of each MPPT branch, and dividing into multiple voltage clusters according to the proximity of voltage amplitude; performing phase coordination on each MPPT branch in the same voltage cluster to obtain a controllable amplitude and direction sub-ripple vector; overall planning the sub-ripple vectors of all voltage clusters, adjusting the intra-cluster and inter-cluster phase relationship of the voltage clusters multiple times through an iterative algorithm, so that each sub-ripple vector gradually offsets each other; generating a modulation signal for driving each MPPT branch according to the optimal phase set output by the iterative algorithm. The medium and equipment are used for implementing the above method. The application has the beneficial effects that: the application performs zoned collaborative control on each MPPT branch, can effectively suppress the ripple influence caused by each MPPT branch on the bus under the condition of unbalanced output voltage, and improves the power quality and equipment life.