42 results about "Reactance" patented technology

A matching device disclosed herein comprises a plurality of reactance elements, a plurality of relays, a ground element, and an inductor element. The plurality of reactance elements are connected to a high frequency supply line for high frequency power for plasma generation. The plurality of relays include a relay coil and a relay switch each having a first contact connected to each of the plurality of reactance elements. A second contact different from the first contacts of some relay switches among the plurality of relay switches is connected to the ground element. A third contact different from the first contacts of the remaining relay switches among the plurality of relay switches is connected to the inductor element and is connected to the high frequency supply line. The plurality of reactance elements include a lower electrode, a dielectric plate, a plurality of first upper electrodes, and a plurality of second upper electrodes.

The utility model belongs to the field of high-voltage switch temperature rise tests, and discloses a current regulating system for a high-voltage switch temperature rise test, a power supply device is sequentially connected with a voltage regulator, a reactance load unit and a current booster, the other end of the current booster is connected with a high-voltage switch to be tested, and two ends of the reactance load unit are connected with a short-circuit switch in parallel; due to the introduction of the reactance load unit, the total load of the system is increased when the load is small, the regulation of the voltage regulator is more stable, the output current of the large current generator is closer to the designed operation point, and the stability of the test current is obviously improved; when large current output is needed, the short circuit switch can bypass the reactance load unit to reduce the total impedance of the system, and the system can still keep efficient output. According to the system, through dynamic access or short circuit of the reactance load, the effective regulation range of the voltage regulator is expanded, the current regulation speed is reduced by utilizing the characteristics of the inductance load, stable current output is realized, the test precision is improved, good adaptability and controllability are achieved, and the temperature rise test requirements of switch equipment with different capacities are met.

The present application relates to a kind of oil-immersed reactance type tap changer, wherein drive mechanism includes conversion index plate, conversion mechanism includes insulated shaft and conversion frame body, and the rotation of conversion index plate is driven by insulated shaft, and conversion frame body is driven to rotate;Conversion frame body includes movable contact disc A, conversion insulating disc and movable contact disc B, wherein first movable contact and second movable contact are respectively arranged on conversion insulating disc and electrically connected with movable contact disc A and movable contact disc B;Antenna static contact A that is always in contact with movable contact disc A is arranged on the upper portion of mounting frame, and the lower portion of mounting frame is provided with the static contact B of antenna that is always in contact with movable contact disc B;Multiple tap static contacts are arranged on mounting frame along the circumferential direction, and each tap static contact is respectively connected with corresponding tap on series coil in single-phase reactance type voltage regulator, and the first movable contact and the second movable contact are rotated by conversion insulating disc and are converted with each tap static contact connection.The present application is compact in structure and reliable in gear conversion, and also increases the number of gear conversion.

The concept according to the invention proposes a generator (11) for powering various instruments (35, 44), which provides a desired output characteristic curve without the aid of a control loop. For this purpose, it uses a reactance network (19) which itself has a desired characteristic curve (i.e., intrinsic). This is accomplished by providing various selectable composite resistances in the output branches of the generator (11), which provides different relationships between the output power and the load resistance.

To provide a reactance compensation circuit capable of eliminating matching deviation based on the influence of the output capacity of a semiconductor switch as much as possible.SOLUTION: The phase shift amount control circuit 65 outputs a control signal for controlling the phase shift amount based on the capacitor voltage VCB. The variable phase shift circuit 62 shifts the phase based on the control signal. The bridge circuit 63c is driven by the drive signal shifted by the variable phase shift circuit 62, and the voltage outputted from the bridge circuit 63c is controlled to have a predetermined difference in phase from the voltage on the side of the power transmission source with respect to the bridge circuit 63c.SELECTED DRAWING: Figure 2

The invention provides a method for accurately calculating the leakage reactance of a transformer, and the method comprises the steps: obtaining a calculation formula of the primary side leakage reactance and the secondary side leakage reactance of the transformer through formula derivation according to a quantitative relation that the leakage reactance of the transformer is directly proportional to the square of the number of turns of a winding; the direct proportion quantitative relation between the leakage reactance of the transformer and the square of the number of turns of the winding is obtained according to a calculation formula, and the leakage reactance values of the on-load tap-changer of the transformer under different gears can be accurately calculated by combining the relation between winding parameters and gear adjustment of the on-load tap-changer. After the technical scheme of the invention is adopted, the accuracy and practicability of leakage reactance calculation of the transformer can be improved, the load distribution of the transformer can be more reasonable by accurately calculating the leakage reactance values of the primary side and the secondary side of different gears, and the calculation precision of voltage regulation of the transformer is improved.

The application relates to the technical field of adjusting devices, and discloses a self-adaptive reactance adjusting device for a variable current voltage regulator, which comprises a screw cap, a containing cavity arranged in the screw cap, and a rotating rod, the screw cap is sleeved on the outer surface of the rotating rod and can rotate with the central axis of the rotating rod as the rotation center, and the rotating rod is arranged to rotate simultaneously with the rotating rod when the screw cap rotates. When the semicircular ring can move along the diameter direction, the friction block can be driven to move along the diameter direction of the semicircular ring, the friction block is driven to move close to or away from the friction ring by the semicircular ring, the force of the friction block abutting against the friction ring is increased or decreased, the size of the friction force during movement is changed, the operator can know that the generated friction resistance is different under different gear positions, the operator can notice the adjusting range and proportion, the operator can be prevented from making mistakes, and it is ensured that no error occurs in subsequent reactance adjustment.

The embodiment of the application discloses a kind of load tap changer and adaptive reactance of current transformer coordinated control method, device and storage medium, method includes: the load tap changer of current transformer is with adaptive reactor and forms joint control unit, obtains the transient security index of each joint control unit;Exchange the transient security index between adjacent converter station, and based on transient security index, combined with electrical coupling relationship, collaborative generation is used to characterize commutation instability state system-level operation forbidden zone description, form collaborative security constraint quantity;According to collaborative security constraint quantity and system-level operation forbidden zone, determine security condition;When collaborative security constraint quantity meets security condition, only by continuously adjusting the reactance value of adaptive reactor to AC side voltage and current are quickly adjusted;When collaborative security constraint quantity does not meet security condition, trigger load tap changer to execute gear switching.The application significantly improves the transient stability of multi-terminal high-voltage direct current system.

The embodiment of the invention discloses a cooperative control method and device for on-load tap-changer and adaptive reactance of a variable-current voltage regulator and a storage medium, and the method comprises the steps: enabling an on-load tap-changer and an adaptive reactor of the variable-current voltage regulator to form a combined control unit, and obtaining a transient safety index of each combined control unit; exchanging transient safety indexes between adjacent converter stations, and cooperatively generating a system-level operation forbidden area description used for representing a commutation instability state based on the transient safety indexes and in combination with an electrical coupling relationship to form a cooperative safety constraint quantity; determining a safety condition according to the collaborative safety constraint quantity and the system-level operation forbidden area; when the collaborative safety constraint quantity meets the safety condition, the voltage and current of the alternating current side are quickly adjusted only by continuously adjusting the reactance value of the self-adaptive reactor; and when the collaborative safety constraint quantity does not meet the safety condition, triggering the on-load tap-changer to execute gear switching. According to the invention, the transient stability of the multi-terminal high-voltage direct-current system is remarkably improved.

The utility model discloses a low-inductive-reactance precision resistor and an electronic device. The low-inductive-reactance precision resistor comprises a first conductive plate, a first insulating layer, a first resistor foil, a second insulating layer, a second resistor foil, a third insulating layer and a second conductive plate which are sequentially stacked together in the vertical direction. Wherein two outer end edges of the first resistance foil and the second resistance foil are welded together; the first conductive plate and the first resistance foil are respectively welded together at a first position and a second position of the first resistance foil; the second conductive plate and the second resistance foil are welded together in the middle of the second resistance foil, and the current directions in the first resistance foil and the second resistance foil are opposite.

An impedance matching device comprises a variable reactance circuit. The variable reactance circuit comprises a loosely coupled line portion 4 which includes a first line 2 and a second line 3 loosely coupled to the first line. One end 3a of the second line is connected to ground 5. The variable reactance circuit further comprises a capacity variable portion 6 provided between the other end 3b of the second line and ground. The capacity variable portion comprises a diode 7 connected between the other end of the second line and ground, a capacitor 8 connected in series to the diode between the other end of the second line and the diode, a variable DC power supply 11 connected between ground and a connection point 9 between the capacitor and the diode so as to apply reverse bias voltage to the diode, and a resistor 10 connected in series to the variable DC power supply between the connection point and ground.

The application discloses a kind of monitoring method and system of electric power grounding system, applied to resistance detection technical field, method includes: obtaining the position distribution information of each ground body in target electric power grounding system;Based on position distribution information, the mutual impedance information of each ground body is obtained;Determine the target excitation frequency point of ground body;The target excitation signal is applied to corresponding ground body, and corresponding response signal is obtained;Orthogonal demodulation is carried out to the target impedance component extracted from response signal, and resistance response component and reactance response component are obtained;According to resistance response component, the equivalent resistance value of ground body is obtained, and the impedance data of ground body is determined based on reactance response component to process equivalent resistance value;Based on the impedance data of ground body, the resistance monitoring data of target electric power grounding system is obtained.The monitoring method and system of electric power grounding system provided by the application effectively improve the accuracy of resistance monitoring of the electric power grounding system of multiple ground body.

An inductive power transfer receiver. The receiver comprising an inductive power input circuit comprising a tuning circuit with a receiver coil, and a power control circuit for controlling the output power. A controller configured to control the power control circuit. The power control circuit comprises at least one variable reactance component that can be varied to control the output power provided to the load.

The application relates to the technical field of current transformer production management, in particular to a low leakage reactance type protection current transformer production management system, which comprises a data processing module for obtaining a control coefficient based on detection results and monitoring results; the absolute value of the control coefficient is directly proportional to the adjustment amount of the linear velocity of the external circumference when the preset transformer rotates; the positive and negative values of the control coefficient are used for judging the adjustment direction of the linear velocity; and the numerical value of the control coefficient is used for judging whether the linear velocity can be adjusted. The application realizes intelligent control of the production process by monitoring the production process and detection data after production, keeps the compound error of most products in the preset transformer within a small range, that is, the production precision is increased, and the demand for customized production process can be met in the daily production process.

Various embodiments are described for controlling the resonant frequency of a resonator. The system includes at least one resonant circuit and an active variable reactance circuit that controls the resonant frequency of the at least one resonant circuit. The active variable reactance circuit includes an electrically controllable switching element and a switch controller subcircuit configured to switch the electrically controllable switching element at a frequency of a radio frequency (RF) current or voltage passing through or across the device such that the RF current flowing from a first terminal to a second terminal is substantially sinusoidal.

The invention provides a magnetic reactance type dynamic voltage restorer control method and device, and relates to the technical field of voltage restorer control, the method comprises the following steps: synchronously collecting a power grid voltage, extracting vector information of the power grid voltage, comparing the vector information with a target value to obtain a voltage vector deviation containing amplitude and phase deviation, and then combining the deviation with a real-time load current to obtain a real-time load current. Calculating equivalent inductive reactance and capacitive reactance target values presented by the series branches required for voltage recovery through a circuit model; according to a pre-calibrated non-linear mapping relation of the magnetically controlled reactor, an equivalent inductive reactance target value is reversely calculated into a corresponding direct current exciting current reference value, and finally, an exciting winding is tracked and driven through high-dynamic current, so that actual current tracks the reference value, the magnetic conductivity of an iron core is changed to adjust the equivalent inductive reactance of the alternating current side of the iron core, and the magnetic field of the magnetic controlled reactor is adjusted. And the voltage of the power grid is recovered to a target range through closed-loop iteration.

The application discloses a virtual reactance inverter grid-connected method based on droop control, which is based on the reference voltage generated by single-loop droop control and the dq-axis current, and adds virtual impedance control to generate virtual voltage to correct the reference voltage. The implementation effect of the method is equivalent to the increase of the internal inductance of the power grid, and the effect of weakening the strong grid inertia connected is achieved, so that the stability of the single-loop droop control inverter connected with the strong power grid is strengthened. The application is applied to the grid-structured single-loop droop control inverter, can realize the function of stable interconnection of the single-loop droop control inverter and the strong power grid, and has the characteristics of simple control method, less input devices and the like.

The invention discloses an M3C bridge arm reactance optimization method, system and device and a medium, and belongs to the technical field of power electronics, a mathematical model of a modular matrix converter M3C single bridge arm loop is established, a bridge arm voltage expression is deduced, and bridge arm voltage and bridge arm current are respectively split into a power frequency component and a low frequency component; setting a first proportion of the reactance voltage drop of the power frequency side bridge arm to the bridge arm voltage and a second proportion of the reactance voltage drop of the low frequency side bridge arm to the bridge arm voltage, wherein the first proportion is greater than the second proportion; determining a proportion relation between a power frequency component and a low frequency component in the bridge arm current; deducing the upper limit value of the reactance voltage drop of the bridge arm according to the first proportion, the second proportion and the ratio of the power frequency component to the low frequency component; and based on the upper limit value of the reactance voltage drop, combining the power frequency angular frequency, the low frequency angular frequency and the corresponding bridge arm current component, and calculating to obtain an optimized bridge arm reactance value.

The invention provides a multi-path impedance circulator structure with interdigital capacitance compensation, and the structure is characterized in that the ends, far away from a central disc, of all microstrip lines of each microstrip line group are set as first interdigital parts which are recessed inwards, and the side, facing the central disc, of a second grounding metal layer is set as a second protruding interdigital part; the first interdigital part and the second interdigital part extend in a mutually staggered manner to form an interdigital capacitor structure, the size of the multi-path adder structure can be greatly reduced under the same bandwidth requirement through the first interdigital capacitor structure, and meanwhile, the overall loss of the multi-path adder structure can be reduced to a certain extent; besides, compensation is carried out through the first interdigital capacitor structure, the freedom degree of the multi-path addition circulator structure is increased, the structure can be conveniently adjusted according to circulators with different indexes, larger bandwidth expansion or out-of-band rejection can be conveniently achieved, and the multi-path addition circulator has good application prospects in the fields of satellite communication, radar, electronic countermeasures and the like.

Embodiments of the present application relate to the technical field of terminals. Provided are a power amplifier circuit, a communication module, and a communication device. The power amplifier circuit comprises a power divider, a coupling unit, a first reactance unit, a first power amplification unit, and a signal amplification unit. The power divider is configured to decompose a radio frequency signal into a first signal and a second signal. The first signal is transmitted to a control end of the signal amplification unit by means of an input port and an isolation port of the coupling unit and the first power amplification unit, such that load impedance of the signal amplification unit is negatively correlated with input power of the radio frequency signal during power back-off. The second signal is amplified by means of the signal amplification unit and then is outputted. A phase shift of the first signal at the coupling unit is related to reactance at a fourth port. The first reactance unit is configured to adjust the reactance at the fourth port. In this way, phase adjustment and amplitude adjustment of the first signal are decoupled by means of the coupling unit and the reactance unit, thereby reducing the design difficulty and debugging difficulty of the power amplifier circuit.

A technique for characterizing a product based on a reactance signal and a resistance signal exhibited by the product in an electromagnetic field is disclosed.

The invention relates to an oil immersed reactance type tap switch which is characterized in that a driving mechanism comprises a conversion index plate, a conversion mechanism comprises an insulating shaft and a conversion frame body, and the insulating shaft is driven by the conversion index plate to rotate and drives the conversion frame body to rotate; the conversion frame body comprises a moving contact disc A, a conversion insulation disc and a moving contact disc B. The conversion insulation disc is provided with a first moving contact and a second moving contact which are electrically connected with the moving contact disc A and the moving contact disc B respectively. The upper part of the mounting frame is provided with a reactor static contact A which is always in contact with the moving contact disc A, and the lower part of the mounting frame is provided with a reactor static contact B which is always in contact with the moving contact disc B; a plurality of tap static contacts are arranged on the installation frame in the circumferential direction, each tap static contact is connected with a corresponding tap on a series coil in the single-phase reactance type voltage regulator, and the first moving contact and the second moving contact are driven by the conversion insulation disc to rotate and are in conversion connection with the tap static contacts. The gear shifting mechanism is compact in structure and reliable in gear shifting, and meanwhile the gear shifting number is increased.

The utility model provides a power supply device which comprises a power supply module, two wire inlet ends, N discharge gaps and N impedance elements, each impedance element comprises a resistor and a reactance element which are connected in series, the N discharge gaps are connected between the two wire inlet ends, one wire inlet end is used for being connected with a protective ground, and the other wire inlet end is used for being connected with the protective ground. The N discharge gaps are used for introducing the instantaneous overvoltage of the power supply module into the protection ground, and N is an integer greater than or equal to 2. Wherein the N discharge gaps are sequentially connected in series, and each discharge gap in the N discharge gaps is connected with one impedance element in parallel. According to the scheme provided by the invention, the withstand voltage test can be carried out under the condition that the discharge gap is grounded, so that the production efficiency can be improved.

The application provides a frequency reconfigurable antenna and a control method of the frequency reconfigurable antenna, and belongs to the technical field of communication. The antenna main radiator is divided into M sections, and a variable capacitance diode is introduced at the connecting feed line of adjacent radiators, so that the antenna with fixed physical form is converted into a composite resonant network with continuously adjustable reactance parameters. When the control voltage adjusts the capacitance value of the variable capacitance diode, the change of the capacitance directly acts on the radio frequency energy coupling process between adjacent radiators, changes the phase delay and distributed reactance of the signal, and thus accurately adjusts the effective electrical length and resonant frequency of the antenna.

This invention provides a method and system for harmonic suppression in power grids based on adjustable reactance ratio of capacitor switching, belonging to the field of line harmonic suppression technology. Specifically, it involves: constructing a harmonic prediction model based on historical photovoltaic operating data and historical harmonic suppression data; predicting harmonic variation trends by combining current operating data; determining the corresponding target reactance ratio by combining bus voltage harmonic data; calculating the total value of the switched capacitors; selecting the switched capacitor combinations based on the total switched capacitor value and performing initial switching; identifying the current harmonic suppression scenario based on the actual reactance ratio of the bus after initial switching, the harmonic suppression effect, and the target reactance ratio; constructing a harmonic suppression correction strategy based on the capacitor combination status; and adjusting the switched capacitor combinations until the harmonic suppression target is met. This invention, after initial capacitor switching based on harmonic variation trends, monitors the actual reactance ratio and harmonic suppression effect in real time to identify and correct reactance ratio deviations, effectively ensuring the stability and reliability of harmonic suppression filtering.

The invention provides a reactance characteristic determination method, a reactance characteristic determination device and a radio frequency power supply system, the reactance characteristic determination method is used for determining reactance characteristics of a load, a voltage value of direct current electric energy is an input voltage value, and a voltage value of radio frequency electric energy transmitted to the load is an output voltage value. The reactance characteristic determination method comprises the following steps: controlling and adjusting the impedance value of a load to be a plurality of preset impedance values, and controlling and adjusting the power value of direct current electric energy to be a plurality of preset power values when the impedance value of the load is any one preset impedance value. And when the impedance value of the load is any preset impedance value and the power value of the direct current electric energy is any preset power value, obtaining an input voltage value and an output voltage value to obtain a plurality of test input voltage values and a plurality of test output voltage values. And determining the reactance characteristic of the load at least according to the plurality of test input voltage values and the plurality of test output voltage values. The reactance characteristic of the load can be quickly determined.

The invention relates to the field of converter control, in particular to a current reference current limiting method, system and device with equivalent reactance characteristics and a storage medium. Obtaining the original current reference and the maximum allowable output current amplitude of the grid-forming type GFM converter; calculating an original phase angle and an original amplitude based on the original current reference; calculating an amplitude reduction proportion according to the original amplitude and the maximum allowable output current amplitude; calculating a current reference rotation angle based on the amplitude reduction proportion; calculating a current reference phase angle after amplitude limiting based on the original phase angle and the current reference rotation angle; calculating the amplitude of the current reference after amplitude limiting based on the original amplitude and the amplitude reduction proportion; generating a current reference after amplitude limiting according to the phase angle and the amplitude of the current reference after amplitude limiting; according to the current reference current limiting method, the defect that the equivalent output impedance cannot be a reactance characteristic after the network construction type GFM converter enters current limiting in the existing current reference current limiting method is overcome, and the transient stability margin of the system is remarkably improved.

The present application relates to the technical field of new energy dynamic reactive power support, and provides a new energy dynamic reactive power support capability evaluation method and system based on equivalent reactance. The new energy dynamic reactive power support capability evaluation method based on equivalent reactance comprises: according to whether the current reaches the current limit during low voltage ride through of a new energy station, and combining different voltage drop conditions of a grid-connected point, the equivalent reactance of the low voltage ride through of the new energy station is calculated; the equivalent reactances corresponding to different voltage drop conditions of the grid-connected point are accumulated, and then the average value is obtained to obtain a comprehensive support stiffness which is taken as an evaluation index of the new energy dynamic reactive power support capability; when the distance between the grid-connected point and the power grid exceeds a set distance, the smaller the comprehensive support stiffness, the better the support effect of the dynamic reactive current increment scheme on the voltage of the grid-connected point during voltage drop. The present application can make the evaluation result more in line with the actual situation, so as to guide the voltage stability operation decision of the new power system.