928 results about "Series compensation" patented technology

A method and a device for airborne laser scanning flying height change real-time compensation can eliminate adverse effect of flying height change to a laser scanning point cloud distribution area and cloud density of a laser scanning point. When the flying height of an airborne platform is changed, a flying height change value is acquired by a global position system(GPS)/ inertial navigation system(INS)integrated measurement device, the value of a scan field angle which can keep the width of a scanning stripe unchanged and the value of a laser pulse frequency which can keep the laser scanning point cloud density unchanged are calculated in a flying height compensation controller. A rotating prism photoelectric shaft angle encoder measures and obtains a real time rotating angle of a rotating prism and offers the real time rotating angle of the rotating prism to the flying height compensation controller, a square signal which is identical with an expect laser pulse frequency value is outputted only within a scope of the required scan field angle and offered to a laser pulse transmitter, thus a laser transmitter can launch a laser pulse of the corresponding frequency. By using the compensation method, the flying height change of the airborne platform can not affect the laser scanning point cloud distribution area and cloud density of a laser scanning point permanently.

A closed loop control system for a fuel pump based on characteristics of speed, pressure, and current. The pressure generated by the pump system is increased at the point in time when the pump system is working against a dead head system (i.e., coasting) to a level that a calibration valve is opened to a determined working point. By measuring the characteristic phase current as a function of the speed, the characteristic is able to be compared, with the pre-calibrated value of the hardware to perform an error compensation algorithm. The error compensation is overlaid with the standard pressure characteristic as a function of speed and phase current, and uses the pre-calibrated opening pressure value (i.e., the inflection point) of the calibration valve and/or in addition the change of the speed to the initial (first calibration), or to a sliding average therefrom.

Systems and methods for implementing line overload control via providing distributed series impedance are disclosed. One system, amongst others, comprises at least one distributed series reactor (DSR). Each DSR comprises a single turn transformer (SST) comprising two split-core sections (132), a winding (120), and an air-gap (138), the air-gap designed such that a magnetizing inductance is produced when the two split-core sections (132) are clamped around a conductor (108). Each DSR further comprises a contact switch (122) that short circuits the winding when the contact switch (122) is in a closed condition, a power supply (128) that derives power from conductor line current, and a controller (130) configured to open the contact switch when the conductor line current reaches a predetermined value, thus causing insertion of the magnetizing inductance into the conductor. The controller (130) may be further configured to close the contact switch (122) when the conductor line current drops below the predetermined value.

The invention relates to a numerical control machine tool error real-time compensation system based on a virtual instrument, which belongs to the field of numerical control machine tool error compensation technology. According to the invention, an error compensation hardware system and a software system are comprised. As the carrier and the executive component of the software, the hardware system is for realizing the connection and communication of various function modules, data storage, and man-machine interaction. The software system based on virtual instrument programming is for realizing the preprocessing of temperature and an error data signal, the modeling of a machine tool error mathematical model, the real-time calculation of the error data, the data interaction between the compensation system and PLC, the optimization of an expert system, and the automatic identification and optimization of a self learning system. According to the invention, with the adoption of a method that combines a virtual instrument technology and a software compensation technology and with the collaborative work of the hardware system and the software system, the prediction and the real-time compensation of various processing errors of the numerical control machine tool is effectively realized, and the robustness and the reliability of the compensation system are improved based on the expert system and the self learning model, thus the system provided by the invention has the characteristics of simple operation and wide applicability.

The present invention discloses one kind of heave compensation system for drill stem of marine floating drilling platform. High pressure hydraulic oil is led from the energy accumulator through a compensation control valve to the compensating hydraulic cylinder, so as to provide one additional force controlled based on the heave motion of the platform for raised compensation effect. The control unit detects the vertical motion of the platform to control the hydraulic system for compensating the heave motion of the platform by means of the steel cable or chain to make the crossbeam and rotary hook in vertically quiescent state relative to the well bottom. The present invention is superior to traditional passive heave compensation system, and has high reaction speed, high compensation precision, low power consumption and low operation cost.

The invention relates to a protection device and a series compensation system for an MOV (Metal Oxide Varistor) in the series compensation, and belongs to the technical field of high-voltage protection systems. The protection device is connected in parallel with the two ends of the MOV, and comprises bypass circuit breaker, a damping circuit and an electronic switch, wherein the bypass circuit breaker and the electronic switch are connected in series with the damping circuit after being connected in parallel. According to the invention, the protection device, which is arranged at the two ends of the MOV in the series compensation system, comprises the bypass circuit breaker, the damping circuit and the electronic switch, and the bypass circuit breaker and the electronic switch are connected in series with the damping circuit after being connected in parallel. According to the invention, the electronic switch, which replaces a traditional spark gap, and the bypass circuit breaker having a harsh demand on the closing time are adopted to reduce the fault rate of both a series compensation capacitor group and the MOV, which is caused by over voltage, to the utmost, so that the reliable and safe operation of the series compensation capacitor group and the MOV is ensured.

The invention discloses a fixed-gain self-excited non-contact resonant converter and a control method thereof, belonging to the field of electric energy conversion. The fixed-gain self-excited non-contact resonant converter comprises a self-excited non-contact resonant converter main circuit, a secondary side current detection circuit and a driving signal generation circuit. Detected current is set according to the compensation method of a resonant converter: for series/series and parallel/series compensation circuits, the secondary side current of a non-contact transformer is detected, and for series/parallel compensation circuits, the input current of a secondary side rectifier bridge is detected. The detected current is detected by the secondary side current detection circuit, a detection signal is isolated and fed back to a primary side through the driving signal generation circuit, and phase compensation is conducted to accurately detect the phase information of the secondary side detected current. According to a found characteristic that the phase of the secondary side detected current at the fixed gain position of the non-contact resonant converter is the same as the phase of square wave signals at the middle point of an inverter bridge arm in the main circuit (1), the detected secondary side current signals are converted into the driving signals of the main circuit to realize self-excitation control. On one hand, a real-time response can be made to the parameter change of the non-contact transformer; and on the other hand, the output of the non-contact resonant converter can be ensured to be stable when a load is changed.

The invention provides a wireless electric energy transmission system compensation topological structure, relates to the wireless electric energy transmission system compensation topological structure, and aims at solving the problems that the existing wireless electric energy transmission system compensation topological structure is high in the number of compensation devices, high in system cost and low in power density. The S/CLC compensation topology comprises a primary series compensation capacitor, a loosely coupled transformer, a secondary parallel compensation capacitor, a secondary series compensation inductor and a phase shifting capacitor. The primary series compensation capacitor is connected with a full-bridge inverter. The primary series compensation capacitor is connected with the primary self-inductor of the loosely coupled transformer. The primary self-inductor of the loosely coupled transformer is connected with the full-bridge inverter. The secondary self-inductor of the loosely coupled transformer is connected with the secondary parallel compensation capacitor and the secondary series compensation inductor. The secondary self-inductor of the loosely coupled transformer is connected with the secondary parallel compensation capacitor, the phase shifting capacitor and a full-wave rectifier. The secondary series compensation inductor is connected with the phase shifting capacitor and the full-wave rectifier. The wireless electric energy transmission system compensation topological structure is used for wireless electric energy transmission.

A reactive power compensation and harmonic governance system and a control method for realizing power compensation and harmonic governance by using the same belong to the field of an electric system and solve the problems that the prior reactive power compensation technique cannot synchronously realize the full compensation for the electric network while meeting the reactive power compensation of continuous change, compensating capacity has waste and system cost is high. The system of the invention uses the structure that M groups of TSCs are connected to the electric network in parallel, the three-phase output ends of SVG are respectively connected to one end of an inductor, the other end of each of three inductors is respectively connected the three phases of the electric network. The control method of the reactive power compensation and the harmonic governance comprises: processing the collected electric current values and voltage values by a controller, obtaining the control parameters of the TSC according to a switching rule for realizing stage reactive power compensation, obtaining the control parameters of the SVG by combining with an instantaneous reactive power theory for realizing the compensation of the residual reactive power between each two stages. The invention realizes the quick and continuous reactive power compensation and the harmonic governance under the condition that load contains harmonic current, and is used for the reactive power compensation of the electric system.

The invention discloses an open winding permanent magnet synchronous motor series compensation vector control system which is composed of a direct-current power source, a main converter powered by the direct-current power source, an open winding permanent magnet synchronous motor, a compensation converter powered by a power supply capacitor, voltage sensors arranged at the two ends of the power supply capacitor, a current sensor arranged on the stator side of the open winding permanent magnet synchronous motor, a speed sensor arranged on a rotation shaft of the open winding permanent magnet synchronous motor, and a controller controlling the main converter and the compensation converter. According to the open winding permanent magnet synchronous motor series compensation vector control system, the compensation converter which is arranged at the stator tail end of the open winding permanent magnet synchronous motor and powered by the power supply capacitor is controlled to equivalently change stator winding impedance, so that the power factor of the main converter approaches to or reaches 1; through cooperation control over the main converter and the compensation converter, distribution of active power and reactive power is changed, performance of the motor is improved, a flux weakening control area of the permanent magnet synchronous motor is expanded, and the operation range is widened.

A method for performing lens shading compensation is provided. The method includes: receiving at least two series of source images of different exposure settings; performing first lens shading compensation on the at least two series of source images respectively; analyzing luminance distribution of the at least two series of compensated source images; composing a series of HDR images from the at least two series of compensated source images according to the luminance distribution; performing second lens shading compensation on the series of HDR image; and performing tone mapping on the series of compensated HDR images. A system for performing lens shading compensation is also provided.

The high-voltage series compensation capacitor group unbalance protection device is related to the relay protection of high-voltage transmission lines, and solves the problems of few functions and low sensitivity of the existing protection devices. Including the A/D conversion module, which converts the current generated by the capacitor bank current transformer D and the unbalanced current transformer E into digital quantities, and the data judgment and calculation module, which converts the current Ic of the capacitor bank, the unbalanced current ΔI, and the current of the capacitor bank A Threshold current Imk, capacitive reactance change rate Kx of the original H-arm capacitive reactance, reliability factor Kk to calculate the number of faulty capacitor units, storage module, storage threshold current Imk, capacitive reactance change rate Kx, reliability factor Kk, faulty The number of times and calculation results are used to protect the output module, and the judgment result of the calculation module is judged according to the data to alarm or trip protection.

A transmission line system, a device for fault protection and computer programs, and a method for locating a fault in a series-compensated two-terminal power transmission line including a compensating bank for providing series-compensation to the transmission line. Different subroutines are utilized for locating faults on line segments from the first terminal to the compensating bank and line segments from the second terminal to the compensating bank. A selection is then made in order to determine a valid result. The subroutines utilize three phase currents synchronized measurements from both terminals and a three phase voltage measurements from one terminal for determining the respective per unit distance to a fault.

The invention discloses a network mobile robot locus tracking control method based on linearity auto-disturbance rejection, comprising steps of establishing the moving robot locus tracking control system model containing communication delay, describing the uncertainty dynamic condition caused by the time delay as the uncertainty of the system model, designing an extended state observer for estimating the uncertainty of the locus tracking control system which is caused by the network time delay, designing a moving robot locus tracking linearity auto-disturbance rejection controller with the extended state observer to perform dynamic linearity compensation on the uncertainty dynamic condition caused by the time delay. As a result, the invention eliminates affects on the system performance which are caused by the network time delay and realizes the real-time compensation of the network time delay and the high accuracy locus tracking.

The invention discloses a comprehensive series compensation voltage ride-through device of a wind turbine generator. The comprehensive series compensation voltage ride-through device of the wind turbine generator is mounted on a three-phase circuit between a wind driven generator and a control device of the wind driven generator and a PCC (point of common coupling) of a power grid, and comprises a three-phase standard transducer, a series coupling transformer, a two-way charge-discharge circuit, a DC bus capacitor and a by-pass switch. With the adoption of a dynamic voltage restorer, a chopper circuit and a super capacitor with high-capacity energy storage in the power electronic technology, low voltage ride through, high voltage ride through and harmonic compensation are realized under the condition that generator terminal voltage drops off during power grid fault, generator terminal voltage rises due to excessive reactive power of the power grid and the harmonic content of the power grid is overlarge, the wind turbine generator is prevented from being separated from the grid, and harmful effects of harmonic are prevented; and moreover, a conventional wind turbine generator is not required to be transformed, and the device can be taken as an independent control module and added at the stator output port of the wind turbine generator and is convenient to mount.

The invention relates to a delay inequality estimation method based on phase compensation. The method is used for estimating the delay inequality of different receiving array elements for receiving target radiation signals in an underwater sound ternary array passive positioning system. The method includes the steps that phase compensation is performed on the cross-power spectrum signals between the receiving array elements; energy obtaining and peak search are performed on the cross-power spectrum signals subjected to phase compensation, and a delay inequality period value is obtained; the delay inequality correction value of the cross-power spectrum signals subjected to phase compensation is obtained on the phase compensation peak point through a least square method; the delay inequality period value and the delay inequality correction value are added together, and a final delay inequality estimation value is obtained.

The invention discloses a free space frequency signal transmission and synchronization system based on phase compensation. The free space frequency signal transmission and synchronization system based on the phase compensation comprises a transmitting station and a receiving station, wherein a reference frequency source provides a reference frequency signal, a transmitting compensator transmits an uplink frequency signal through a transmitting antenna, the transmitting station is used for receiving a returned downlink frequency signal, and actively compensating phase noise input by a frequency signal in a free space transmission process by utilizing the reference frequency signal and the received downlink frequency signal; the receiving station is used for receiving the uplink frequency signal with the phase noise input in the free space transmission process by utilizing a receiving antenna, locking a servo frequency source phase in the uplink frequency signal by utilizing a variable-frequency locking device, generating a downlink frequency signal of which the phase is locked in the uplink frequency signal, and returning the downlink frequency signal to the transmitting station, so that the transmitting station actively compensates the phase noise, and finally the receiving station obtains a frequency signal of which the phase is locked in a reference frequency source of the transmitting station.

The invention relates to an optimal configuration and operation method for reactive compensation of a wind farm. The optimal configuration and operation method is characterized by comprising the following steps of: (1) analyzing the reactive output characteristics of the wind farm, and installing a reactive compensation device in the wind farm and configuring a volume for the reactive compensation device; and (2) detecting reactive powers of a fan outlet and an interconnection point of the wind farm, and mechanically controlling the static reactive compensation and the dynamic reactive compensation of the wind farm. The optimal configuration and operation method is designed reasonably, the combination operation of the static reactive compensation and the dynamic reactive compensation of the wind farm is realized, and the reactive powers of the wind farm and a power grid are ensured under the optimal condition of the reactive compensation device of the wind farm, therefore the effect of maintaining power grid stabilization is achieved, the reactive compensation property of the wind farm is improved, the reactive compensation equipment investment is reduced, and the reactive compensation economic and technological requirements of the wind farm are satisfied.

The invention relates to a reactor type short-circuit fault current limiter, which consists of reactors, a capacitor, a switch and lightning arresters. During the stable state of an electric grid, the current limiter works at a series resonance or series compensation status and is of low impedance; and after the electric grid is subjected to short-circuit fault, windings of the reactors are saturated due to overcurrent, or meanwhile, the change of the reactance of the reactors is controlled through closing the switch, so that the current limiter generates high impedance to realize fault current limiting. According to the current limiter, the automatic fault response is realized through the saturation of the reactors, and the current-limiting capacity is improved through circuit resonance; meanwhile, the manufacture cost of a system can be greatly lowered through the reasonable design of a current limiter structure; and the current limiter is strong in current-limiting capacity and has little influence on the electric grid, and the safety and the reliability of the operation of the electric grid are effectively improved.

The invention discloses a distributed power quality conditioner and a method for controlling the same. The distributed power quality conditioner comprises one or more series compensation devices and parallel compensation devices, wherein each of the series compensation devices and the parallel compensation devices comprises a central controller; the series compensation devices and the parallel compensation devices do not share a direct current bus; and when the series compensation devices and the parallel compensation devices are used together, a management center is configured for acquiring the voltage of an electric network and load current information to determine the failure type of the electric network, and coordinately operating all series compensation devices and all parallel compensation devices.