62 results about "Reactive components" patented technology

The invention relates to the technical field of self-synchronizing voltage source control, and discloses a balance current controlled self-synchronizing voltage source control method and system. The method comprises the following steps: acquiring and preprocessing operation data of a grid-connected inverter to obtain active / reactive components of voltage and current of a filter element; generating a three-phase terminal voltage instruction of the self-synchronizing voltage source based on the components, and determining a current instruction signal in combination with the grid-connected voltage; a three-phase modulation signal is generated through adjustment of a PIR controller and coordinate inverse transformation, then a filter inductance value is calculated according to the ripple characteristic of the modulation signal and a switching period, a filter capacitance value is determined by combining resonant frequency, and finally accurate control of the self-synchronizing voltage source is realized according to a filter parameter. By dynamically calculating the matching parameters of the filter inductance and the filter capacitance, the active regulation and control capability of the output impedance characteristic of the inverter is enhanced, and the resonance risk during the impedance change of the power grid is effectively inhibited. The technical problem that the stability is limited due to insufficient impedance regulation and control in the prior art is solved.

The invention provides an offshore wind power direct current sending-out system structure based on an S7 bridge arm current source converter and a control method of the offshore wind power direct current sending-out system structure. The topological characteristic provided by the invention is that an S7 bridge arm is connected in parallel with the direct current side of the 6-pulse CSC, and the switch of the S7 bridge arm and the switch of each bridge arm of the 6-pulse CSC are distributed, so that multi-active and multi-reactive independent control is realized. The active quantity of the land CSC is controlled by constant direct current voltage, and the reactive quantity of the land CSC is controlled by reactive power. When the collected submarine cable has a fault, the S7CSC reduces the reference value of the AC bus and reduces the current fed by the CSC to a fault point, thereby preventing fault transient overcurrent and realizing fault ride-through. The technical scheme provided by the invention has the advantages that: S7CSC has two control degrees of freedom, can realize independent control of active components and reactive components, stabilizes the offshore AC voltage and frequency, can adapt to the fluctuation of wind power output, effectively inhibits the increase of fault current at the offshore AC collection fault, and realizes fault ride-through.

The invention discloses an inter-phase charge state rapid equalization method and device of a high-voltage direct-hanging energy storage system. The method comprises the steps of obtaining active and reactive components of zero-sequence current in each phase; acquiring external active and reactive current instruction values of the system in real time; judging whether a first condition is met or not; if yes, entering the second mode, otherwise, running the first mode; the first condition comprises that the absolute value of the maximum SOC deviation value among the three phases is smaller than or equal to a preset threshold value; the first mode comprises the following steps: continuously acquiring zero-sequence current regulation factors of each phase according to a preset phase current maximum threshold value, a current instruction value and active and reactive components of zero-sequence current in each phase, and selecting a real-time minimum value in the zero-sequence current regulation factors of each phase as a real-time regulation factor; multiplying the real-time regulation factor by the zero-sequence current, and injecting into the PCS; the second mode comprises the steps of multiplying the real-time regulation factor at the moment of entering the second mode by the zero-sequence current and injecting into the PCS; when the current command value changes, a first mode is entered.

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.

Disclosed is a microwave cavity resonator used as a phase change (phase modulation) to intensity change (intensity or amplitude modulation) converter. Certain aspects and embodiments include resonant circuits, such as a resistor, inductor and capacitor (RLC) circuit. Certain aspects and embodiments convert changes in phase to changes in output voltage to perform analog demodulation of a phase modulated microwave carrier. Certain aspects and embodiments use resonance when the reactive components of the circuit (capacitive and inductive components) are equal in magnitude and 180 degrees out of phase with one another, thereby cancelling out the reactance component of the circuit's impedance.

A method (100) for joining several workpieces (10, 12), the method (100) comprising: Application (102) of adhesive material (14) to a first workpiece (10); Bringing (104) a second workpiece (12) into contact with the adhesive material (14) so ​​that the adhesive material (14) is located between the first workpiece (10) and the second workpiece (12); Contacting (106) of the first workpiece (10) with a first electrode (36) prior to generating (106) a resistance heating; Contacting (106) the second workpiece (12) with a second electrode (40) before generating (106) the resistance heating; Generating (106) resistance heating in the first workpiece (10) and the second workpiece (12) under initial processing conditions to partially cure the adhesive (14) and to join the first workpiece (10) and the second workpiece (14) together to form a partially cured workpiece assembly (44) bonded with adhesive (14); and Exposure (108) of the partially cured workpiece assembly (44) bonded with the adhesive (14) to heat under second processing conditions in order to substantially cure the adhesive (14); wherein the adhesive (14) is a thermosetting adhesive system containing polymers, polymer precursors and / or reactive components, and is in the form of a liquid or paste which cross-links or otherwise hardens depending on temperature and time; wherein the first processing conditions comprise an electric current between the first electrode (36) and the second electrode (40) of 1.5 kA to 2.5 kA, which is generated for a time of 1.5 seconds to 2.5 seconds and is effective to generate a temperature of about 200°C to about 375°C in the first workpiece (10) and the second workpiece (12); wherein the first processing conditions involve applying a force of about 3 kN to about 5 kN through the first electrode (36) and the second electrode (40) to the first workpiece (10) and the second workpiece (12); and where the second processing conditions include a temperature of approximately 150°C to approximately 200°C and a duration of approximately 15 minutes to approximately 25 minutes.

To provide a power conversion device used as a grid-type inverter capable of continuing operation even during power grid phase jumps.SOLUTION: In a power conversion device 100, a current command restriction unit 18 generates a current command I* based on the comparison result of the current value, in which the active and reactive components of a pre-constraint current command I are combined, with the limit value Ilim, a suppression power calculation unit 21 calculates a suppression power Psupp by calculating the difference between the pre-constraint power according to the pre-constraint current command I and the post-constraint power according to the current command I*. An active power command correction unit 14 corrects an active power command P0 based on the suppression power Psupp calculated by the suppression power calculation unit 21.SELECTED DRAWING: Figure 1

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.

The invention provides a control method of a charging power unit, the charging power unit, a charging pile and a medium, and relates to the technical field of power grids, the charging power unit comprises a phase-locked loop, the phase-locked loop comprises a controller, and the method comprises the following steps: obtaining a reactive component of an input voltage of the charging power unit; and under the condition that the reactive component exceeds the preset range, the current parameter of the controller is switched from the first parameter to the second parameter, so that the reactive component is adjusted to be within the preset range. According to the invention, rapid following of frequency can be realized, and the problems of bus voltage overcharge, current peak and the like are avoided.

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.

The invention relates to electrical engineering and can be used as a device for: protecting the electrical circuits of any sources of alternating / direct current where the input voltages are significantly greater than the output voltages; ensuring the expected level of operability of equipment powered by any sources of alternating / direct current when the input voltages are significantly lower than permissible levels; and completely eliminating reactive components of an electrical grid. The aims of the invention are: to achieve high capacities without significantly increasing size and weight parameters; to increase efficiency and reliability; to reduce dimensions and weight; and to provide for smooth start-up. The invention includes: a block comprising a power portion and a sine wave generator; a control block for a power factor corrector with current protection; a microcontroller block; a block for output voltage protection and smooth start-up.

The invention provides a frequency power output characteristic test method and device, electronic equipment and a storage medium, and the test equipment is connected with tested equipment through an isolation transformer, and obtains a real-time active component and a real-time reactive component of a current signal outputted by the tested equipment in a two-phase rotating coordinate system; the test equipment changes the output power and frequency of the tested equipment based on the real-time active component, the real-time reactive component and a preset control strategy; and obtaining a frequency-power output characteristic curve of the tested equipment through a fitting algorithm.

A three-state switching cell based frequency multiplying string PV power converter apparatus. The power converter apparatus includes a plurality of cascaded three-state switching cells arranged in two or more power units configured to receive power from two or more variable DC power sources, such as string photovoltaic power sources, and produce a multilevel terminal voltage. The apparatus generates a reduced amplitude ripple and multiplies the effective switching frequency in the reactive components by multiples of two, four, or more times the fundamental switching frequency of the three-state switching cells. Frequency multiplication and multilevel voltage generation is aided by cascading two three-state switching cells sharing a single transformer. The reduced voltage and current ripple amplitude and increased effective frequency allow reduced component size resulting in an efficient power converter apparatus with high power density

The invention discloses an induction motor stator resistance identification method based on coordinate transformation, and solves the problems of flux linkage and resistance parameter coupling and complex calculation in a traditional method. A resistance equation is constructed through the orthogonal relation between the stator flux linkage and the induced voltage, and the stator resistance is directly calculated by using the constraint condition that the inner product of the flux linkage and the voltage is zero in a steady state; the orthogonal relation is converted to a stator current synchronous rotating coordinate system, a flux linkage amplitude calculation module is designed in combination with instantaneous reactive power, the flux linkage amplitude is correlated through a reactive component of the current coordinate system, and resistance interference is avoided; and calculating a resistance estimation value based on the ratio of the voltage to the flux linkage component under the current coordinate system, and suppressing noise in combination with low-pass filtering. According to the method, through coordinate transformation and orthogonal decoupling, the coupling error of the flux linkage and the resistor is remarkably reduced, the calculation process is simplified, the dynamic response speed and the parameter robustness are improved, and a high-precision and low-complexity solution is provided for parameter identification of the induction motor.

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.

The invention provides a receiving end fault ride-through control method and a receiving end fault ride-through control system for a new energy via flexible direct current islanding sending-out system, and the method comprises the steps: setting a voltage reference value of a sending end alternating current line through a converter station after detecting that a direct current voltage exceeds a safety threshold value, and injecting a negative sequence voltage harmonic component into the alternating current line; after a network side converter of the new energy power plant detects that the voltage is reduced, a low-voltage ride-through strategy is started, and negative-sequence voltage harmonic waves in a line are detected; and when the detected negative sequence voltage harmonic wave is detected, the new energy power plant is switched to an active load shedding strategy. Under the condition of actively reducing the AC voltage of the sending end, the grid-side converter actively reduces the active input according to the AC voltage detected locally and the negative sequence voltage harmonic component, the problem of matching of the load shedding power and the surplus power is solved, meanwhile, the reactive component is not supported, the reduction of the local input power is accelerated, and the power consumption is reduced. And the interference problem of reactive power support left and right on active voltage reduction control is optimized.

A filter circuit comprising: a signal path for carrying a signal from an input to an output; the signal path comprising a first reactive component; a first node on the signal path; a first series resonant circuit comprising at least a second reactive component in series with a third reactive component, the first series resonant circuit being connected between the first node and a ground; an active circuit; the active circuit comprising a voltage controlled current source (VCCS) arranged to change the current flow through the second reactive component in dependence on a voltage sensed (or measured) on the signal path. The first series resonant circuit forms a single harmonic trap with a notch frequency defined by the component values of its reactive components. The effectiveness of the series resonant circuit is dependent upon the strength with which it draws current from the signal path at its resonant frequency.

The invention discloses a grid-connected converter self-adaptive active support method for different resistance-inductance ratios of a power grid, which comprises the following steps of: firstly, constructing a three-phase disturbance source injection grid-connected point, measuring disturbance response of voltage and current of the power grid, and calculating impedance and resistance-inductance ratios of the power grid; secondly, on the basis of power grid impedance, constructing a reference coupling coefficient matrix set containing cross and disturbance groups, and solving a reference coupling coefficient matrix with the highest coefficient fitness; then establishing small signal models of active power and reactive power, and calculating a per-unit coupling coefficient matrix for evaluating a coupling relationship; and finally, performing Hadamard product operation on the reference coupling coefficient matrix and the per-unit coupling coefficient matrix to obtain an actual coupling coefficient matrix, and designing a frequency and voltage control equation of the grid-connected converter with active and reactive components. The grid-connected converter active supporting method is suitable for different power grid resistance-inductance ratios, controller parameters can be adjusted in a self-adaptive mode according to dynamic changes of power grid impedance, and active supporting of frequency and voltage is achieved under various working conditions.

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.

Certain aspects of the present disclosure provide techniques for jammer rejection at an antenna tuner. An example apparatus includes a first filter comprising at least one reactive component. The apparatus further includes an antenna tuner comprising a capacitor bank selectively coupled in parallel with the at least one reactive component. The apparatus further includes a first set of switches coupled to at least the first filter, wherein the first set of switches is configured to switch among at least a first mode and a second mode, wherein the first mode is configured to bypass the first filter across a signal path, and the second mode is configured to apply the first filter across the signal path.

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.

The present invention discloses a single-phase power supply device, which includes a Vv transformer, a TSC, a TCR, a first SVG and a second SVG. The TCR and the first SVG reduce or cancel the first reactive component of the output current in phase with the total output voltage of the Vv transformer, and the TSC and the second SVG reduce or cancel the second reactive component of the output current. When one of the first reactive component and the second reactive component is an inductive reactive component, the other is a capacitive reactive component, achieving balanced power supply, reducing or even eliminating the negative sequence current on the three-phase voltage input side of the Vv transformer, and reducing the possibility of overload and negative sequence tripping of the Vv transformer. In addition, the reactive component of the output current is relatively small compared with the active component, and the passive devices TSC and TCR cancel a part of the reactive component of the output current, and the cost of the passive devices is relatively low. Therefore, the first SVG and the second SVG with smaller capacity can be selected, reducing the cost.

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 invention provides a method and device for testing output characteristics of a converter, electronic equipment and a storage medium. The voltage-power output characteristics of the converter are tested through the following steps: acquiring a three-phase voltage value at a common connection point and a three-phase current value injected by test equipment; tracking a PCC voltage phase in real time, and establishing a synchronous two-phase rotating coordinate system; converting the sampled three-phase current value from a three-phase static coordinate system to a two-phase rotating coordinate system to obtain a corresponding collected active component and a collected reactive component; the test equipment controls the output current based on the difference value between the given active component and the collected active component and the difference value between the given reactive component and the collected reactive component, so that the converter generates corresponding voltage response; and obtaining a voltage-power output characteristic curve of the converter based on the change of the three-phase voltage value at the common connection point under different disturbance conditions. The problem of a black box current device in an existing train auxiliary power supply system is solved.