26 results about "Reactive components" patented technology

The invention discloses a control method and system for an energy storage converter, and the method comprises the steps: enabling a centralized controller to carry out the droop control and centralized secondary control in a grid-connected state; in an off-network state, closed-loop control and load power distribution are carried out through the virtual synchronous machine; after a power grid fault is detected, controlling each energy storage converter to output reactive component zero clearing, disconnecting power grid connection and switching to an off-grid mode; after detecting that the power grid returns to normal, enabling the output of each energy storage converter to be synchronous with the voltage and phase of the power grid through pre-synchronization control, closing the power grid connection, and switching to a grid-connected mode; and when a communication fault or the energy storage converter is detected to be offline, adjusting the power distribution of the energy storage converter in normal operation, after recovery, enabling the power distribution to be consistent with the common bus parameters through pre-synchronization, and then redistributing the power. According to the invention, power dynamic optimization distribution and bus power grid stable synchronization during grid connection are realized, grid-connected and off-grid switching is free of impact, and the operation stability and the power supply quality of the micro-grid are remarkably improved.

The present disclosure provides a method for context-aware circuit design for a wearable device. The method includes determining a peak power requirement at a selected operating voltage for a rectifier circuit to be coupled between an antenna and system circuitry of the wearable device, the peak power requirement is based on a distance (d) between the wearable device and a power transmitter; determining a real value of at least on real circuit component of the rectifier circuit based on the peak power requirement; and determining a reactive value of at least one reactive component of the rectifier circuit based on the peak power requirement.

A metering valve (4) is shown and described as a substantially dead-space-free and self-closing shut-off device for preferably at least substantially residue-free metering of a reactive and / or property-modifying component (21) and / or a reactive component mixture in a two- or multi-component mixing process, with a metering tube (6) and with an elastic, tubular closure element (7) applied to the metering tube (6), wherein the closure element (7) in a closed or rest state of the metering valve (4) closes at least one outlet opening (8) of the metering tube (6) against the outlet of a liquid flow present in the metering tube (6) and is reversibly expandable in a metering operation of the metering valve (4) under a metering pressure of the liquid flow in order to allow the outflow of the liquid flow via the outlet opening (8).

The invention discloses a double-side impedance trajectory optimization high-frequency wireless electric energy transmission system and method based on multi-mode matching network integration and a near-zero impedance angle rectifier, and relates to the field of high-frequency wireless electric energy transmission. The problems that the impedance conversion function of an existing high-frequency resonant rectifier structure shows nonlinear capacitive change, a large number of reactive components are generated, the impedance angle fluctuates greatly along with the load, the voltage stress is high, the efficiency is sharply reduced in the wide load range and the like are solved. One end of a multi-mode matching network is connected with a Class-E power amplifier and the other end of the multi-mode matching network is connected with a coupling coil through impedance track optimization at a primary side, so that output power change compression under wide-range load change is realized; the secondary side is connected with the coupling coil through a near-zero impedance angle rectifier, the near-zero impedance angle rectifier comprises a three-unit novel resonant rectifier, the three-unit novel resonant rectifier comprises three-mode smooth input impedance, the three-mode smooth impedance is connected in parallel, and impedance angle compression and high-efficiency operation under a wide load are achieved.

The invention discloses a split-phase control method applied to a three-phase three-bridge-arm energy storage converter, and relates to the technical field of software algorithm control strategies, and the method comprises the steps: sampling voltage and current signals of a three-phase power grid, and obtaining the voltage and current instantaneous values of each phase; for each phase, extracting an active component and a reactive component of the phase from the voltage and current instantaneous values of the phase by adopting sliding window discrete Fourier transform; comparing the active component and the reactive component of each phase with a given reference value to obtain an error signal; the error signal of each phase is input into a corresponding controller for closed-loop control, and a modulation signal of each phase is generated; and comparing the modulation signal of each phase with the carrier signal to generate a PWM (Pulse Width Modulation) driving signal to drive a corresponding bridge arm of the three-phase three-bridge arm energy storage converter. According to the split-phase control method provided by the invention, a controller is independently designed for voltage and current of each phase, so that three-phase operation is independent to form an access. The control architecture is simple and convenient to implement.

The power conversion device of the present application includes: an active power command correction section that corrects an active power command inputted from the outside; a current command generation section that generates a pre-constraint current command for an alternating current power; a current command constraint section that generates a current command to which a constraint based on a prescribed limit value is applied to the pre-constraint current command; a current control section that generates a voltage command for the alternating current power based on the current command; and a suppressed power calculation section that calculates a suppressed power suppressed in the alternating current power due to the constraint, the current command constraint section generates the current command based on a comparison result of a current value in which an active component and a reactive component of the pre-constraint current command are combined and the limit value, the suppressed power calculation section calculates a difference between a pre-constraint power corresponding to the pre-constraint current command and a post-constraint power corresponding to the current command to calculate the suppressed power, and the active power command correction section corrects the active power command based on the suppressed power calculated by the suppressed power calculation section.

This invention proposes a dual zero-sequence voltage injection cascaded H-bridge power control method combining levitation and energy storage. The device consists of m cascaded H-bridge modules equipped with supercapacitors (SC) and n cascaded H-bridge modules equipped with levitation capacitors (FC) connected in series. Under three-phase grid asymmetry, the negative-sequence current is first controlled to zero. Then, through hierarchical control, the reference voltage generated during grid operation is decomposed into active and reactive components. The SC module provides active power support by acting as an active voltage reference, while the FC module handles reactive power regulation in grid operation scenarios, achieving active-reactive decoupling control. By injecting zero-sequence voltage parallel to the current direction into the levitation and energy storage modules respectively, the DC bus voltage is stabilized. The short-time power response capability of the supercapacitors is fully utilized, improving the system's dynamic performance and reliability. This method is suitable for power quality regulation scenarios involving cascaded H-bridges with energy storage during grid operation.

A power generation system includes a generator configured to output alternating current (AC) power, an active rectifier configured to receive the AC power from the generator, convert the AC power to direct current (DC) power, and output the DC power. A current injector is connected to the active rectifier and is configured to provide an injection current to power flowing through the active rectifier. The injection current includes a reactive component.

Synchronous quadrature current compensators and synchronous average harmonic current compensators effectively control the harmonic current flow between the isolation bridges of a clock bidirectional resonant power converter. The synchronous average harmonic current compensator controls the superposition of low-frequency and switching currents across the nodes of the current control bridge to track the commanded line current and harmonic linearizes the dynamic coupling admittance of the voltage control bridge. A differential amplifier attenuates the low-frequency and reactive components of the bridge current signal from the quadrature current compensator. An error amplifier sums the synchronously modulated quadrature current signal used to estimate the transmitted harmonic current to track the safety-limited quadrature current command reference by generating a duty cycle. The line is inductively connected to either the voltage control bridge or the current control bridge, where the other bridge is driven by a duty cycle to command the harmonic current flow between the bridges.

An instantaneous voltage command value calculation unit (140) uses a reference operation phase (θop) and a voltage amplitude command value (Ve) to generate instantaneous voltage command values (Vu*, Vv*, Vw*) of an output voltage to an AC power system in which current suppression control is reflected, wherein said reference operation phase (θop) and said voltage amplitude command value (Ve) are calculated by control calculation based on AC detection values (Vsys, Isys) classified as an active component and a reactive component by a coordinate conversion performed by a coordinate conversion unit (105). A PWM calculation unit (150) generates on / off command signals (Sgu, Sgv, Sgw) for switching elements constituting the power conversion device, in accordance with the instantaneous voltage command values (Vu*, Vv*, Vw*). A rotation phase (θdt) used for the coordinate conversion in the coordinate conversion unit (105) is set so that the phase of the instantaneous voltage command values (Vu*, Vv*, Vw*) matches the rotation phase (θdt).

According to the present disclosure, a passband filter is provided. The passband filter has a series branch, where the series branch comprises a set of one or more resonators having a resonant frequency sufficiently away from the passband of the filter such that spurious modes, of the set of one or more resonators, that are associated with the resonant frequency are outside of the passband of the filter; a set of one or more reactive components in series with the set of one or more resonators, the set of one or more reactive components having a resonant frequency sufficiently away from the passband of the filter such that the spurious modes of the set of one or more reactive components, that are associated with the resonant frequency are outside of the passband, and such that the resulting combined resonant frequency of the series combination of the set of one or more resonators and the set of one or more reactive components is within the passband of the filter.

The application provides a kind of active power distribution network multi-resource collaborative on-grid and off-grid control method, device and storage medium, the method comprises: determining the voltage active component U a And voltage reactive component U r Of line impedance voltage according to the initial signal of converter;If power distribution network fails, the phase instruction of converter output current is dynamically adjusted based on the voltage active component U a And voltage reactive component U r Of line impedance voltage, realize the control of converter output current in off-grid state;If power distribution network restores power supply, realize the control of converter output current in on-grid state based on current operating state.The present application not only can get rid of the dependence on satellite time signal, and can realize the flexible control of converter output current phase during on-grid to autonomous, which is beneficial to reduce the cost of equipment and improve the operation reliability of equipment.

Hybrid DC-DC converters are described. One aspect is an electrical circuit configured to perform a DC-DC voltage conversion between an input voltage Vin and an output voltage Vout. The electrical circuit may include a first electrical network that includes seven switching transistors and two flying capacitors. The electrical circuit may further include a second electrical network that includes seven switching transistors and two flying capacitors. In an aspect, the first electrical network and the second electrical network are interconnected at least at each of an input node associated with the input voltage, an output node associated with the output voltage, and a switching node. The electrical circuit may also include a magnetic reactive component connected between the switching node and the output node. In an aspect, the DC-DC voltage conversion involves a repeated cycle of four distinct switching system states.

The application is suitable for the technical field of multi-level topology harmonic suppression and four-quadrant feedback control, and provides a multi-level topology harmonic suppression and four-quadrant feedback integrated control system and method, which comprises the following steps: S1, system initialization, input parameters, and loading preset parameters; S2, real-time calculation of output voltage harmonic distortion rate THD through fast Fourier transform, harmonic analysis, if the harmonic analysis is greater than 5%, the adaptive harmonic elimination algorithm is activated, and a compensation voltage waveform is generated; S3, separation of active / reactive components through Park transformation, judgment of energy flow direction, and four-quadrant mode switching; S4, the compensation voltage is superimposed on the modulation wave through the improved SVPWM, and then four-quadrant feedback control is carried out; S5, IGBT junction temperature, DC bus ripple, and harmonic spectrum are collected, power grid voltage fluctuation is predicted based on LSTM, and the carrier frequency is dynamically adjusted. The scheme has good harmonic suppression effect, high energy efficiency improvement, fast dynamic response, low maintenance cost, and strong environmental adaptability.

The invention discloses an energy storage system multi-target cooperative control method, system and device and a storage medium, and the method comprises the steps: a controller obtains the day-ahead load prediction data of a regional power grid, sets a charging and discharging power threshold value based on the day-ahead load prediction data, and generates a basic active power instruction; after the basic active power instruction is generated, the controller introduces virtual synchronous machine control logic to obtain a final active power reference value conforming to the battery health constraint and the power grid frequency constraint; calculating the residual capacity of the energy storage converter based on the active power reference value, and calculating a compensation coefficient based on a harmonic component and a reactive component in the load current; and according to the residual capacity and the compensation coefficient, determining the current operation condition and synthesizing a final control instruction to drive the energy storage converter to output. Reactive support and harmonic treatment are carried out by using the residual capacity of the energy storage converter, and virtual synchronous machine control and charge state adaptive adjustment are combined, so that the maximization of the operation benefit of the energy storage system and the improvement of the power quality of the power grid are realized.

An example antenna assembly includes an electrically small antenna having at least two sectors, wherein the at least two sectors are coupled to operate in at least a first mode and a second mode, the first mode is a radiative mode having a resonance, and the second mode is a non-radiative mode. The antenna assembly includes at least one time-varying reactive component having a parametric modulation frequency configured to at least partially couple the resonance of the radiative mode to the resonance of the non-radiative mode at a negative frequency, wherein the parametric modulation frequency of the at least one time-varying reactive component is greater than or less than a frequency value which exactly couples the resonance of the radiative mode to the negative frequency of the non-radiative mode.

The invention relates to the technical field of electric energy quality optimization, in particular to a self-adaptive compensation photovoltaic integrated unified electric energy quality regulator and a control method thereof, and the self-adaptive compensation photovoltaic integrated unified electric energy quality regulator comprises a series compensator, a parallel compensator, a direct current bus, a photovoltaic module and a controller; the photovoltaic module is connected to the direct current bus through a reverse blocking diode, and is provided with a maximum power point tracking module for providing active power support for the system; the series compensator and the parallel compensator are connected to a direct current bus in a back-to-back manner; the series compensator is connected to a power grid side in series through the three-phase series injection transformer. A self-adaptive weight updating mechanism of the ALFMS algorithm is utilized, fundamental wave active and reactive components are directly extracted from distorted voltage and current signals, a low-pass filter is completely abandoned, phase delay caused by the filter is eliminated, a controller can make instantaneous response to sudden rising and sudden dropping of the voltage of a power grid or load fluctuation, and therefore the power grid voltage can be effectively controlled. And the dynamic tracking performance of the system is greatly improved.

This invention discloses a station-level reactive power control method for a flexible DC transmission system, comprising: detecting and obtaining measured values ​​of voltage and current signals at the converter station's point of common coupling (PCC); comparing the reference value of the AC current reactive component at PCC with the q-axis component of the measured current signal, the difference being used as the reactive current deviation at PCC; obtaining the voltage compensation amount for the AC near-zone of the converter station after applying a correction factor of K times to the reactive current deviation; comparing the AC voltage reference value with the voltage compensation amount and the measured AC voltage value to obtain the reactive power outer loop deviation; obtaining the AC current reactive component reference value after PI regulation of the reactive power outer loop deviation; and using the AC current reactive component reference value as the input for inner loop control. This method can fully utilize the reactive power regulation capability of the flexible DC transmission system, reduce the frequency of fluctuations during reactive power compensation, and prevent drastic fluctuations caused by reactive power compensation.

An amplifier circuit that includes an RF amplifier; an impedance matching network; a higher order harmonic termination circuit; a fundamental frequency matching circuit; and an integrated passive device (IPD) that includes a silicon carbide (SiC) substrate. The integrated passive device (IPD) includes one or more reactive components of the fundamental frequency matching circuit and one or more reactive components of the higher order harmonic termination circuit.

1. The name of the design product: low-voltage active filter compensation device. 2. The use of the design product: filter connected in parallel to the power grid, detecting, regulating harmonic and reactive components; self-commutated bridge circuit, regulating the amplitude and phase of the voltage, directly controlling the current on the AC side. As an active compensation device. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention relates to an artificial intelligence optimized LCL-D-Statcom power quality control method for a power distribution network, and the method specifically comprises the steps: constructing an LCL type distributed static compensator composed of a voltage source converter and an LCL filter, namely, LCL-D-Statcom, and the LCL type distributed static compensator is used for connecting a three-phase power distribution network; embedding the pre-trained deep learning model into a control module of the LCL type distributed static compensator, extracting a fundamental wave active component and a fundamental wave reactive component in a load current, and calculating respective weights; respectively fusing the active compensation component and the reactive compensation component generated by the PI controller and respective weights with the weights of the active component and the reactive component of the fundamental wave to obtain the total active weight and the total reactive weight of the reference current instruction; multiplying the total active weight and the total reactive weight by corresponding unit voltage signals respectively, and synthesizing to obtain a three-phase reference current instruction; and generating a modulation signal based on the reference current instruction and the actual current signal, and driving a voltage source converter to inject compensation current into a power grid.

This invention relates to a variable gain power amplifier. In the described example, the variable gain power amplification technique includes: generating a first oscillation signal (400) using a network of one or more reactive components included in an oscillator; and outputting a second oscillation signal (402) via one or more taps included in the network of reactive components. The second oscillation signal has an amplitude that is proportional to and smaller than that of the first oscillation signal. The power amplification technique further includes selecting one of the first and second oscillation signals to generate a power-amplified output signal (404), and amplifying the selected one of the first and second oscillation signals to generate the power-amplified output signal (406).

The invention discloses an alternating current stable output control method for a doubly-fed wind generating set, which comprises the following steps of: S1, electrifying and self-checking a system, acquiring related key data in real time, and setting active and reactive power target values; s2, decomposing the rotor current into active and reactive components for independent and decoupled accurate adjustment; s3, synchronizing with a power grid through a phase-locked loop, stabilizing the voltage of a direct-current bus, independently outputting reactive power, and assisting in adjusting the voltage of a grid-connected point; s4, overspeed and overpower are limited through a variable pitch system, the safety of the unit is protected, virtual inertia control is started, and rotor kinetic energy is rapidly released when the power grid frequency fluctuates; s5, monitoring the voltage of the power grid in real time, immediately switching on a protection circuit when a drop occurs, and switching a control mode to ensure that the power generator is not off the grid; s6, continuously monitoring output electric energy quality, dynamically optimizing controller parameters, and feeding forward smooth power fluctuation; the method has the advantages of high electric energy quality, high reliability and high power grid friendliness.

Systems for hybrid DC-DC voltage conversion are disclosed. One aspect includes an electrical circuit configured to perform a DC-DC voltage conversion between an input voltage and an output voltage. The electrical circuit includes a first electrical network that includes seven switching transistors and two flying capacitors, and a second electrical network that includes six switching transistors and one flying capacitor. The first electrical network and the second electrical network may be interconnected at least at each of an input node, an output node, and a switching node. Two switching transistors of the six switching transistors in the second electrical network may further connect the first electrical network and the second electrical network. The electrical circuit may include a magnetic reactive component connected between the switching node and the output node. The DC-DC voltage conversion may involve a repeating cycle of six distinct switching system states.

It addresses to a process and device capable of mitigating electric arc faults in electrical panels as quickly as a few milliseconds. The technology uses power thyristors that, after detecting the arc, make the electrical connection of the panel's input bus to ground potential in a controlled manner, diverting the arc currents to this preferred path and forcing their extinction. The proposed suppressor device has improved features, as it includes a “snubber” that forms with the current limiting impedance with inductive reactive component a resonant circuit of Resistance, Inductance (L) and Capacitance (RLC). The “snubber” is capable of mitigating adverse consequences of the RLC circuit voltage transient due to the thyristor shutdown, protecting the same against voltage rises and spurious triggers and limiting the voltage on the panel bus to values below those capable of sustaining the arc fault. The technology relates to equipment for industrial and commercial electrical systems, specifically load distribution centers (LDC) or motor control centers (MCC), which can be configured as a compartment within a LDC or MCC.

The invention discloses a harmonic current analysis method and system based on high-precision FFT and real effective value component synthesis, and a storage medium. The method comprises the following steps: reading three-phase voltage / current time domain waveform data of a high-voltage side of a tested box-type transformer during a transient state; selecting an analysis window with a preset duration from the collected transient data; applying a Hanning window to the data, generating windowed voltage and current signals, and calculating an amplitude correction factor for subsequent compensation; respectively executing fast Fourier transform on the windowed voltage and current signals of each phase, and compensating the amplitude of the complex voltage phasor and the amplitude of the complex current phasor by applying an amplitude correction factor; calculating an active component and a reactive component of the harmonic current; and performing root-mean-square synthesis on the corresponding active / reactive current components of all harmonics and all phases to obtain total harmonic active current and total harmonic reactive current. Quantitative analysis of harmonic active and reactive current under transient working conditions (such as voltage transient uplift or drop) can be realized.