118 results about "Reactance" patented technology

The invention, which relates to the technical field of data analysis, discloses an intelligent data optimization management system for a high-voltage resonant reactance experiment, comprising a data management center. The data management center is in communication connection with a data acquisition module, a data preprocessing module, a resonance state analysis module, an environment interference analysis module, a precision evaluation module and an experiment optimization suggestion module. According to the intelligent data optimization management system for the high-voltage resonance reactance experiment, a resonance state evaluation index is calculated through the resonance state analysis module, the resonance state of a circuit is quantified, the interference degree of external environment factors on the experiment is evaluated in combination with the environment interference evaluation module, and comprehensive analysis is performed through the precision evaluation module; the precision and the accuracy of the experiment result are predicted, so that an experimenter can recognize potential problems in advance and take measures to avoid or reduce related problems, and the predictability and the stability of the experiment result are enhanced.

The invention discloses a controllable current-limiting reactance protection device, a control method, electronic equipment and a medium. Relates to the field of transformers, and solves the problem of low speed of current-limiting protection of an energy storage type distribution transformer. The working state of a power grid circuit is monitored in real time, on and off of a switch tube are rapidly controlled, and the impedance of an access circuit is adjusted, so that the rise rate and the first peak value of fault current can be greatly reduced, an energy storage system and a distribution transformer are prevented from being damaged, and due to the fact that the switching speed of the switch tube is far higher than that of a mechanical switch, the reliability is high. Moreover, fault signals do not need to be analyzed and processed, connection and disconnection of a switching tube are directly controlled, the fault processing speed is also improved, effective current-limiting protection is provided for the energy storage type distribution transformer within a short time when the fault occurs, the current-limiting protection is not affected by operation delay, and the service life of the energy storage type distribution transformer is prolonged. The reliability and the stability of the energy storage type distribution transformer in a micro-grid environment are remarkably improved, and a powerful guarantee is provided for safe and stable operation of a power system.

The invention belongs to the technical field of low-voltage power distribution, and particularly relates to a control method and system for low inductive reactance and low transient impulse voltage, the magnetic flux density and the change rate of a magnetic core are collected in real time through a sensor, a dynamic threshold value is calculated based on the magnetic flux density, and the critical point of the magnetic core entering a nonlinear magnetization area is accurately identified. And comparing the magnetic flux density monitored in real time with a dynamic threshold value, generating a deviation signal and judging the state of the magnetic core. Once it is confirmed that the magnetic core is in a non-linear magnetization state, an adjustment mechanism is triggered immediately, winding current distribution is adjusted to change the magnetic flux path length of the magnetic core, and periodic pulse signals are applied to prevent depth saturation of the magnetic core. In addition, by monitoring the adjusted magnetic core magnetic flux density recovery rate, demagnetization processing parameters and pulse signal strategies are optimized, and continuous and efficient operation of the system is ensured. According to the method, the transient voltage suppression capability and stability of the system are remarkably improved, and the overall performance and reliability are enhanced.

The invention relates to the technical field of power system operation control, and discloses a method and a system for inhibiting three-phase current imbalance of a power transmission line through series reactance, which comprises the following steps: establishing a power transmission line mathematical model, and calculating the positive sequence impedance of each phase line in the power transmission line based on the power transmission line mathematical model, the power transmission line comprises a single-circuit line and / or a multi-circuit line; determining a phase line needing to be compensated in the same circuit and a final compensation reactance value of the phase line; and connecting the final compensation reactance value to the corresponding phase line in series to form a series reactance compensation balanced power transmission line. According to the method, the problem of three-phase current imbalance can be thoroughly solved from the source, the method is not influenced by the operation mode and the network topology change, and the method is more feasible than the whole-line complete rolling transposition.

The invention provides an electric power system node voltage-active sensitivity calculation method and system, and belongs to the technical field of electric power system operation control, and the method comprises the steps: constructing an admittance matrix of a nonlinear node in an electric power system; performing inversion on the admittance matrix of the nonlinear node to obtain an impedance matrix of the nonlinear node in the power system; determining a reactance matrix of the non-linear nodes in the power system according to the impedance matrix of the non-linear nodes, and taking the reactance matrix as a first reactance matrix; constructing a reactance matrix of an approximate nonlinear node in the power system as a second reactance matrix; and according to the first reactance matrix and the second reactance matrix, determining a change relationship between the active power injected by each nonlinear node in the power system and the voltage of any nonlinear node so as to determine the voltage sensitivity of each nonlinear node. The method can be used for transient voltage stability analysis, is not limited to a traditional power grid, can also be used for a power grid containing high-proportion renewable energy sources, and has good adaptability and robustness.

The invention discloses a self-adaptive virtual resistance-inductance ratio-based fault ride-through control method for a network-constructed converter, and belongs to the technical field of power grid fault ride-through. The invention discloses a fault ride-through control method for a network-constructed converter based on a self-adaptive virtual resistance-inductance ratio, and the method comprises the steps: firstly analyzing the influence of the virtual resistance-inductance ratio of virtual impedance on the active and reactive power output characteristics of a network-constructed system; three control targets of fault voltage support, current peak limit and system synchronous stability are considered to construct a value constraint boundary of the virtual resistance-inductance ratio of the grid-forming type converter on a virtual impedance plane, and a dynamic selection method of the virtual resistance-inductance ratio is provided in the safety boundary; and selecting an optimal virtual resistance-inductance ratio according to different voltage drop scenes so as to realize collaborative optimization of three control targets. And finally, according to the calculated optimal adaptive virtual resistance-inductance ratio, adjusting a virtual impedance value and putting the virtual impedance value into a control loop so as to limit the short-circuit current during the fault period. According to the method provided by the invention, the voltage supporting capability of the network-forming converter in the fault ride-through process is remarkably enhanced.

The invention provides a GaAs PHEMT-based power amplifier. The GaAs PHEMT-based power amplifier comprises an input matching circuit, an inter-stage matching circuit and an output matching circuit which are connected in sequence, and the output matching circuit adopts a reactance compensation network matching mode. The class E power amplifier obtains excellent performance, the reactance compensation technology is used in the frequency range of 2.45-2.85 GHz, the power additional efficiency PAE is 61%, the output 1dB compression point is larger than 29 dBm, and broadband, high efficiency and high power are achieved; the invention relates to a broadband hybrid class E power amplifier combining parallel circuit load and reactance compensation technology, the bandwidth of a diode parameter amplifier is improved by using the reactance compensation technology, and the output impedance is matched by designing a matching network as a low-pass network. The class-E power amplifier has the characteristics of high gain and high efficiency, and keeps good performance in the aspects of output, power gain and PAE.

The utility model provides an equivalent voltage circuit of a double-motor electric drive assembly. The equivalent voltage circuit comprises a first branch circuit and a second branch circuit, the first end of the first branch is connected with the first end of the second branch through a first reactor; the reactance value of the first reactance is determined by the reactance value of a power coupling device between a first motor and a second motor of the double-motor electric drive assembly; the voltage at the two ends of the first branch is determined by the common-mode voltage of the first motor; the voltage at the two ends of the second branch is determined by the common-mode voltage of the second motor; the first branch comprises a plurality of first sub-capacitors, and the capacitance value of each first capacitor is determined by the capacitance value of the first bearing; the second branch comprises a plurality of second sub-capacitors, and the capacitance value of each second capacitor is determined by the capacitance value of the second bearing; the first motor is connected with the wheels through a plurality of first bearings; the second motor is connected with the wheels through a plurality of second bearings. According to the equivalent voltage circuit of the double-motor electric drive assembly, the technical problem that the double-motor electric drive assembly is not provided with an equivalent voltage circuit can be solved.

A reactance cancelling radio frequency (RF) circuit array is disclosed. The reactance cancelling RF circuit array includes multiple RF circuits each coupled to one or two adjacent RF circuits by one or two pairs of coupling mediums each having a respective length less than one-quarter wavelength. In one aspect, an RF input signal is first split across the RF circuits and then combined to form an RF output signal. As a result, each RF circuit requires a lower power handling capability to process a portion of the RF input signal. In another aspect, each pair of the coupling mediums can cause reactance cancellation in each reactance-cancelling pair of the RF circuits. By coupling the RF circuits via the coupling mediums and enabling splitting-combining among the RF circuits, it is possible to miniaturize the reactance cancelling RF circuit array for improved performance across a wide frequency spectrum.

An impedance matching circuit for a plasma process supply system and a plasma process system, configured for powers≥500 W and frequencies in a range from 2 MHz to 100 MHz, the impedance matching circuit including a matching unit having one or more reactances and a resonator. The impedance matching circuit is configured for operation at a predetermined high frequency (HF) power signal with a predetermined basic frequency and auto-frequency tuning (AFT) bandwidth, limited by a predetermined upper AFT frequency and a predetermined lower AFT frequency. The resonator is configured to not influence the HF power signal at the predetermined basic frequency and to damp the HF power signal and / or influence the HF power signal in a phase at both the predetermined upper and lower AFT frequencies.

The application discloses a variable frequency operation transformer device, which comprises a base frame, a first transformer module, a second transformer module, a reactance module and a switching conversion module; the first transformer winding comprises a first winding unit, a second winding unit and a first switching unit, the first switching unit is connected with the first winding unit and the second winding unit respectively, the first switching unit has at least a first working state and a second working state, the second transformer winding is coupled with the first transformer winding, the second transformer winding comprises a third winding unit, a fourth winding unit and a second switching unit, the second switching unit is connected with the third winding unit and the fourth winding unit respectively, the second switching unit has at least a third working state and a fourth working state, the switching conversion unit is connected with the reactor and the second transformer winding respectively, and the switching conversion unit has at least a fifth working state and a sixth working state; the design is convenient to construct and maintain, saves the occupied area and reduces the construction and maintenance cost.

An apparatus for providing a signal to a device may include one or more RF signal generators and a small electrical transmission line that couples the signal from the one or more RF signal generators to a manufacturing chamber. The apparatus may also include a reactance circuit to transform the impedance of the small electrical transmission line from a region of relatively high impedance sensitivity to a region of relatively low impedance sensitivity.

The present disclosure relates to the technical field of transformer equipment, and specifically provides an inductor structure, a reactance device, and a transformer device. The inductor structure includes: a first magnetic core having a first end and a second end opposite to each other; and a winding including a first conductor and a second conductor, wherein one end of the first conductor is connected to the first end of the first magnetic core, one end of the second conductor is connected to the second end of the first magnetic core, and the first conductor and / or the second conductor are wound around the outer surface of the first magnetic core; the other ends of the first conductor and the second conductor form the connection terminals of the inductor structure. The disclosed inductor structure effectively suppresses eddy currents in the magnetic core and reduces heating of the magnetic core.

The utility model provides a permanent magnet motor reactance parameter testing device based on a voltage integration method, which comprises a test board, a vertical plate is fixed at the top of the test board through bolts, a retractable assembly is arranged at the top of the vertical plate, a hydraulic rod is fixedly mounted on the outer wall of one side of the vertical plate, and the telescopic end of the hydraulic rod is fixedly connected with two connecting lugs. The opposite sides of the two connecting lugs are rotationally connected with pulleys, a pull rope is wound around the outer wall of the rotating shaft, one end of the pull rope is fixedly connected with the rotating shaft, the other end of the pull rope is connected with a hoisting assembly, the pull rope is movably matched with the outer wall of the pulley, the winding and unwinding assembly comprises a support and a motor, the support is fixed to the top of the vertical plate through bolts, and the inner wall of the support is rotationally connected with the rotating shaft. According to the utility model, the permanent magnet motor can be hoisted and moved to the top of the testboard through the cooperation of the retractable assembly and the hydraulic rod, so that the difficulty of manual carrying is reduced, and the use convenience of the device is improved.

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 invention discloses a swing reactance parameter calculation method applied to a PSS and a related device, and the method comprises the steps: monitoring the variable quantity and the corresponding time difference of an electromagnetic power signal inputted into the PSS, and obtaining the actual variable quantity and the actual oscillation period of the electromagnetic power; calculating actual swing reactance based on the actual oscillation period and a preset swing reactance formula to obtain an actual swing reactance value; and if the peak-to-peak value calculated according to the actual variation of the electromagnetic power is greater than a threshold value, selecting an actual swing reactance value, and if not, retaining an initial default value. According to the method and the device, the technical problem of influence on the damping effect of the PSS caused by lack of accuracy and reliability of the calculated rotating speed of the unit due to the fact that the setting problem of the swing reactance parameter is not considered in a targeted manner in the prior art can be solved.

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 invention relates to an equivalent uplink and downlink current ratio fault distance measurement method combined with a segmented reactance table, and the method employs an uplink and downlink current ratio method combined with the segmented reactance table to replace a common reactance ratio method and a common uplink and downlink current ratio method in a current complex line direct supply operation mode for fault distance measurement. The multi-line direct supply traction network is divided into a plurality of sections according to different unit impedance, then the reactance value of each section is calculated according to the impedance and mutual impedance of each section, the method not only can consider the influence of an anti-thunder coil and a power supply line on the distance measurement result, but also can ensure the distance measurement precision when the number of stations is large, and the method is suitable for large-scale popularization and application. The distance measurement error is controlled within the range of 250 meters; maintenance personnel are ensured to quickly find out fault points, timely process faults and recover normal operation of lines, and the method is very important for safe, reliable and efficient transportation of a railway system.

Fault location determination in a power transmission system is described. Samples of voltage and current measured are obtained for each phase at a terminal. A first equivalent reactance value based on the samples of voltage and current is calculated. Further, based on the calculated equivalent reactance value a first fault location is determined.

The invention discloses a grounding distance protection method and system for a tolerant transition resistor, and relates to the technical field of power system research, and the method comprises the steps: solving a transition resistor, a fault resistor and a reactance through employing the sampling information of voltage and current at a protection installation part; establishing a relation between the transition resistance and the fault resistance and the reactance according to a solving result; based on the established relation, the fault resistance and reactance are adaptively adjusted through the transition resistance; and determining a protection action behavior by using the adjusted fault resistance and reactance. When a single-phase net multi-fault resistor grounding fault occurs in an AC power transmission line with new energy transmission, the influence of transition resistance on the measured impedance value is effectively reduced, the problem of refusal to operate caused by the transition resistance fault is avoided, and the accuracy and sensitivity of an intra-region fault judgment result during the single-phase grounding fault are greatly improved.

The invention provides a negative reactance synthesizer. The negative reactance synthesizer comprises a direct-current power supply; the first converter is configured to realize input current shaping under an alternating current input voltage with a given peak value and convert a variable direct current voltage into a fixed direct current voltage; a second converter configured to convert the fixed DC voltage into a superimposed DC voltage greater than a peak value of the AC input voltage, and to superimpose the superimposed DC voltage on the AC input voltage to form a variable DC voltage; a first control circuit configured to generate a first gate driver signal and a first complementary gate drive signal for controlling the first converter; and a second control circuit configured to generate a second gate driver signal and a second complementary gate drive signal for controlling the second converter. The invention provides a simple and low-cost solution to simulate independent negative reactance.

The application discloses a parameter setting method, device and system for a swing reactance of an excitation regulator, wherein the parameter setting method adds forced oscillation to a speed regulator link in a closed-loop simulation test environment, so as to stimulate equal-amplitude oscillation of mechanical power and unit frequency in a set frequency range; the error between a real signal value output by a real excitation device and a simulation signal value output by a simulation test model is calculated, the initial value of the swing reactance parameter is selected according to the error, the adaptability and effectiveness of the swing reactance are verified based on the initial value, the test result is obtained through a voltage step test under a set working condition, and the swing reactance parameter is modified according to the test result, so that the active power fluctuation when the PSS is put into operation meets the set condition. The parameter setting method provided by the application can reduce the risk of power oscillation accidents caused by large unit speed calculation error due to unreasonable swing reactance parameter setting and weak damping or even negative damping of the PSS.

The present invention provides a negative reactance synthesizer comprising: a DC power source; a first converter configured for shaping an input current under an AC input voltage that has a given peak value and converting a variable DC voltage to a fixed DC voltage; a second converter configured for converting the fixed DC voltage to a stack-up DC voltage being greater than the peak value of the AC input voltage and stacked on the AC input voltage to form the variable DC voltage; a first control circuitry configured to generate a first gate driver signal and a first complementary gate drive signal for controlling the first converter; and a second control circuitry configured to generate a second gate driver signal and a second complementary gate drive signal for controlling the second converter. The present invention provides a simple and low-cost solution to emulate a standalone negative reactance.

In one example, an active variable reactance rectifier circuit includes an active variable reactance rectifier circuit input port and an output port. A power splitter circuit includes an input port coupled to the active variable reactance rectifier circuit input port and a pair of output ports. A first rectifier circuit includes an input port is coupled to the first power splitter circuit output port. A second rectifier circuit includes an input port coupled to the second power splitter circuit output port. A power combiner circuit includes a first input port, a second input port and an output port. The first power combiner circuit input port is coupled to the first rectifier circuit output port, the second power combiner circuit input port is coupled to the second rectifier circuit output port and the power combiner circuit output port is coupled to the active variable reactance rectifier circuit output port.

1. The name of this design product: Reactance voltage divider assembly. 2. Purpose of this design product: used for high-voltage electrical testing. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

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.

The invention provides an inverter grid-connected system weak power grid tolerance improvement method based on equivalent resistance reactance analysis, and the method aims at solving the problems that an existing conventional stability parameter design method is high in blindness and has no parameter adjustment direction guidance, and improves the tolerance of an inverter grid-connected system weak power grid by introducing an equivalent resistance reactance distribution diagram. The influence distribution condition of system parameters on stability can be visually displayed, and the parameter adjustment direction can be clearly pointed out. The method comprises the following steps: firstly, obtaining a sequence impedance Bode diagram of a grid-connected system unit and an equivalent power grid, and determining a system instability oscillation frequency; calculating the equivalent resistance and equivalent reactance of the overall aggregation impedance of the system, and drawing a distribution diagram under the condition of target parameter change; then, by combining a stable parameter selection method, locking an area where stable parameters are located, and confirming a parameter adjustment direction; and finally verifying the validity of the selected parameters through simulation. The embodiment shows that the method can effectively improve the stability of the inverter grid-connected system in the weak power grid environment, and has remarkable advantages and beneficial effects.

A power amplifier circuit that can be configured with a single circuit module and that can amplify a plurality of signals separated on the time axis with desired input / output power characteristics is provided. [Solution] The power amplifier circuit comprises an outphasing amplifier having a first amplifier that amplifies a first signal having a first phase generated from a signal to be amplified, a second amplifier that amplifies a second signal having a second phase different from the first phase generated from the signal to be amplified, and a Shereigh combiner including a reactance compensation circuit arranged between the output path of the first amplifier and the output path of the second amplifier, and means for adjusting the susceptance value of the reactance compensation circuit in the Shereigh combiner in accordance with the desired input / output power characteristics of the signal to be amplified.

The invention belongs to the field of new energy grid-connected relay protection, and particularly relates to a pilot reactance protection method based on time domain model recognition. Presetting a pilot reactance protection action area according to the inherent impedance and capacitive reactance parameters of the power transmission line; acquiring three-phase current and voltage sampling values at two sides of the power transmission line, synthesizing differential voltage and differential current data, and calculating the variable quantity of two adjacent sampling points of the differential current; whether longitudinal reactance protection is started or not is determined according to the differential current variable quantity, and waveform similarity detection is conducted on currents on the two sides after protection is started; when a waveform similarity detection result is greater than a threshold value, an external fault is judged, and pilot reactance protection is locked; otherwise, establishing an R-L equivalent circuit model equation, performing parameter identification on the short-circuit impedance, and when the vector positions of the pilot resistor and the pilot reactance in the complex plane fall into a preset pilot reactance protection action area, performing pilot reactance protection section entering, and performing pilot reactance protection action after confirmation.