249 results about "Phase locking" patented technology

The invention discloses a new energy broadband test analysis management and control method and system, and relates to the technical field of new energy detection and intelligent management and control, and the method comprises the following steps: obtaining a multi-window splicing frequency spectrum of a load switching edge, superposing phase lock consistency verification in a splicing frequency spectrum result, generating a frequency spectrum leakage suspicion chart, and carrying out the boundary constraint for energy track extraction; under the constraint of a spectrum leakage suspicion chart, an energy center track, a group delay curve and a phase derivative sequence are extracted, and a cross-frequency migration fingerprint is constructed and is used as a basic evidence for misjudgment traceability. By means of spectrum suspicion identification, feature fusion modeling, misjudgment traceability, label correction, energy reverse intervention and the like, accurate identification and closed-loop regulation and control of false operation caused by spectrum leakage are achieved, high identification accuracy, low misjudgment rate, high anti-interference performance and quick response capacity are achieved, and the operation stability and safety of a new energy field station are remarkably improved.

The invention relates to the technical field of vehicle fault diagnosis, and discloses a vehicle anomaly detection system and method based on multi-modal data analysis, and the system builds a time zero point alignment relation between control domain data and a high-frequency vibration signal through a hardware synchronous triggering unit by using a level pulse; performing angular domain resampling on the non-stationary vibration signal by adopting a coarse-fine coupling phase locking technology and combining rotating speed polynomial fitting and instantaneous frequency ridge line extraction; the system constructs a virtual reference model by using a deep neural network, and deduces a predicted ideal angular domain characteristic spectrum of a current working condition according to a dynamic state vector; and on the basis, calculating the residual error of the actual spectrum and the predicted spectrum, removing noise through order correlation mask filtering, and judging abnormity based on the mahalanobis distance of a residual error vector and a statistical threshold value. The method effectively solves the problems that the signal is not stable and weak fault features are difficult to extract under the variable speed working condition, and improves the detection accuracy.

The invention relates to a high-precision temperature detection system based on an alternating-current impedance bridge. The high-precision temperature detection system comprises a double-resistance bridge circuit, a lock-in amplifier and a differential circuit, the double-resistor bridge circuit comprises a resistive temperature sensor and a standard resistor which are connected in series, and the phase-locked amplifier is a digital phase-locked amplifier realized based on an FPGA (Field Programmable Gate Array). Wherein the initial potential of a first voltage measurement end arranged at the midpoint of the double-resistor bridge circuit is zero by adjusting the two excitation signals which are loaded to the double-resistor bridge circuit and have the same frequency and opposite phases before temperature measurement; in the temperature measuring process, the lock-in amplifier detects the potential of the first voltage measuring end and the voltage at the two ends of the standard resistor through the differential circuit, then the resistance value of the resistance-type temperature sensor is calculated by combining the resistance value of the standard resistor, and then the temperature of the resistance-type temperature sensor is reduced. According to the invention, the anti-interference capability can be improved, and the measurement precision of 0.1 mK level can be reached near 273K.

The invention discloses a fault analysis system and method for ship equipment, and the system comprises a multi-source sensing synchronization module which is configured to carry out the phase synchronization of the operation data of multiple equipment through a hardware phase locking mechanism; the multi-physical field modeling module is coupled to the multi-source sensing synchronization module, and is configured to construct a device virtual state field based on the multi-device operation data after phase synchronization, and generate a dynamic parameter representing a multi-device state time sequence imbalance degree; the adaptive diagnostic analysis module comprises a deep learning fault analysis model, and recessive feature extraction parameters and fault evolution time sequence modeling parameters of the deep learning fault analysis model are adaptively adjusted in real time according to dynamic parameters so as to output system-level fault characterization parameters; and the predictive decision-making module is configured to generate decision-making information containing fault development trend prediction and a preventive maintenance window based on the system-level fault characterization parameters. And high-precision correlation diagnosis and predictive maintenance decision-making of early faults of multiple devices of the ship can be realized.

The invention discloses a non-Gaussian noise pollution spiral shaft rod type part measurement signal processing method, which can realize reliable purification of measurement signals, stable separation of bending deviation and spiral raceway morphology items and fitting reconstruction when pollution such as heavy tails, multiple peaks, burrs and sheet abnormal points exists. The method comprises the following steps: acquiring and synchronously registering measurement data of rotation and axial movement, establishing a joint fitting model for decomposing readings into deformation items and spiral raceway morphology items, and expressing the morphology items by multi-order harmonics, and a three-stage process is adopted to complete baseline establishment and coarse elimination, phase locking and fine filtering in sequence, and the harmonic order of the optimal spiral raceway morphology item is determined in a self-adaptive manner and finally reconstructed. The invention provides an effective solution for the problems that the continuous rotary scanning measurement signal of the spiral shaft rod type part is unstable in recovery and is easy to distort in reconstruction under the non-Gaussian noise pollution.

The invention relates to a square wave generation method and system based on a DDS signal transmitter, and belongs to the technical field of digital electronic signal synthesis. The method comprises the following steps: calculating a digital analog signal sampling frequency based on a square wave output frequency set by a user, and obtaining a digital fundamental frequency phase signal according to a phase-locked loop precision range; mapping the digital fundamental frequency phase signal into a sinusoidal amplitude signal according to a digital phase accumulation mechanism to obtain a digital-analog conversion clock, binarizing the sinusoidal amplitude signal, and outputting a square wave output period; dividing a square wave output period into a low level region and a high level region according to the precision range of the phase-locked loop, reading a square wave output frequency set by a user through a random storage address, and outputting a non-offset phase-locked square wave; and constructing an error accumulation self-checking architecture to calculate a frequency control word, and when detecting that the frequency control word has a decimal discarding error, recalculating the frequency control word.

The invention relates to the technical field of semiconductor radio frequency signal processing, and discloses a narrowband signal receiving system and method, and the system comprises a coarse frequency offset value capturing module, a carrier phase locking module, a digital domain carrier tracking module, a timing synchronization and multipath correction module, and a vector amplitude phase correction and equalization module. In the prior art, the technical problems of lock losing, judgment errors and high bit error rate caused by serious multipath interference and frequency offset drifting of narrow-band signals are difficult to solve in complex environments with multipath effect and high frequency offset, such as urban canyons, basements and warehouses. According to the invention, by introducing analog phase locking, digital fine tuning, dual-correlation symbol synchronization based on multi-path sensing and vector amplitude-phase combined compensation overall architecture with cooperation of analog and digital, the problems of synchronization failure and demodulation performance reduction caused by multi-path distortion in the prior art are avoided; and the sensitivity and the overall reliability of radio frequency signal receiving are remarkably improved.

The invention discloses a wide-frequency three-phase phase-locked loop method, which relates to the technical field of three-phase phase-locked loops and comprises an alternating-current signal acquisition and coordinate transformation unit, a double-reduced-order generalized integrator, a frequency-locked loop frequency estimation unit, a double-second-order generalized integrator, a parallel delay signal cancellation filtering module and a phase-locked loop phase estimation unit. A three-phase power grid voltage signal is input into the alternating current signal acquisition and coordinate conversion unit to obtain a two-phase voltage under a static coordinate system; the double-reduced-order generalized integrator and frequency-locked loop frequency estimation unit outputs a three-phase power grid frequency estimation value and carries out feedforward; and the bisecond-order generalized integrator outputs a three-phase power grid positive sequence component, inputs the three-phase power grid positive sequence component into the parallel delay signal cancellation filtering module to filter out a higher harmonic component, and then inputs the three-phase power grid positive sequence component into the phase-locked loop phase estimation unit to output a three-phase power grid phase estimation value. The method can effectively solve the problem that a traditional phase-locked loop is difficult to lock the phase quickly and accurately when the ship microgrid frequency fluctuates in a large range, and improves the phase-locking precision and dynamic performance.

The invention belongs to the technical field of laser precision machining and control, and particularly relates to a femtosecond laser single-point trigger control system and method based on subnanosecond synchronization, and the method comprises the following steps: S1, building a system synchronization clock locked with a femtosecond laser pulse signal phase; the specific mode of establishing the system synchronous clock is that phase locking is carried out on pulse synchronous signals or frequency division signals output by an internal high-frequency clock source and a femtosecond laser source through a digital phase-locked loop technology, and the low-jitter system synchronous clock which is strictly synchronous with a laser pulse sequence is generated. According to the invention, a system clock locked with a laser pulse phase can be generated through a digital phase-locked loop, and the influence of inherent frequency drift of a laser and circuit delay temperature drift is effectively overcome by combining real-time delay calculation based on a prediction algorithm and a high-resolution DDS delay line technology; the synchronization precision between the triggering moment of the single pulse and the external instruction is stabilized at the subnanosecond level, and the requirement of leading-edge application for the extreme time sequence precision is met.

The invention provides an accelerator low-level control system and method, and relates to the technical field of accelerators. A shared reference source synchronously drives a first signal generation unit and a second signal generation unit, so that a local oscillator signal and an intermediate frequency signal naturally have a phase coherence relationship; the risks of phase inconsistency and noise superposition introduced by multi-unit independent phase locking are reduced from the source; meanwhile, by carrying out coupling sampling on the radio frequency signal and generating digital in-phase data and digital orthogonal data, vectorization measurement on the amplitude and the phase of the radio frequency signal is realized, so that the processing module can generate a compensation instruction in real time based on a calibration error and adjust the amplitude and / or the phase of a local oscillator signal and the amplitude and / or the phase of an intermediate frequency signal on line; therefore, a closed-loop calibration and compensation mechanism is formed, the phase stability, the amplitude stability and the signal purity of radio frequency output are remarkably improved, and the repeatability and the reliability of long-term operation of the system are improved.

The invention discloses a numerical simulation method for a heat-fluid-solid multi-field coupling response characteristic, which relates to the technical field of mechanics and engineering simulation and comprises the following steps of: constructing an asynchronous sampling array, performing joint time-frequency acquisition on a periodic pressure pulsation signal of a fluid and a dynamic response signal of a solid structure, extracting a coupling phase fingerprint baseline, and calculating the coupling phase fingerprint baseline. As a unified reference for energy analysis; and performing coherent decomposition based on the coupling phase fingerprint baseline, calculating a phase-locked energy index, identifying an instantaneous resonance window in a dynamic evolution process, and determining a dangerous frequency band and an interface fragile area. According to the method, unified reference of heat-fluid-solid response data is realized by constructing a coupling phase fingerprint baseline; predicting a crack initiation threshold in combination with anti-fact playback and a risk cone; extracting a minimum disturbance set to construct an energy dissipation channel; time reversal micropulses are applied to cooperate with phonon band gaps and shadows for energy storage, phase lock release and vibration extinguishing control are completed, and closed-loop regulation and control of structure safety are achieved.

The invention discloses an in-ring and out-ring matched single-arm locking system and method, and the method comprises the following steps: starting laser from a spacecraft A, and transmitting the laser to a spacecraft B and a spacecraft C; light transmitted to the spacecraft B and the spacecraft C through link delay is subjected to weak light phase locking and then returns; the returned laser is converged with non-delayed light of the spacecraft A after being subjected to link delay again; the converged light returned from the spacecraft B is fed back to the spacecraft A for in-loop suppression after passing through a feedback controller; and the converged light returned from the spacecraft C is subjected to out-of-loop phase output. According to the invention, a single-arm locking system with in-ring and out-ring matching is constructed by selecting a proper out-ring measurement point and adopting an in-ring suppression and out-ring measurement method. The effects that the laser frequency noise can be remarkably suppressed within the full-scientific frequency band range (0.1 mHz-1 Hz), and gravitational wave signals can be amplified while noise of other technologies is suppressed are achieved.

This invention belongs to the field of time-frequency unification and relates to a fast discipline method and system based on a high-stability OCXO. The method includes selecting a primary reference source, inputting the reference signal into a phase-locked loop frequency multiplier for frequency multiplication, and inputting the processed high-frequency reference signal into a high-precision phase measurement module. A monitoring and processing platform controls two frequency standard signals output from the OCXO frequency standard source through a control word. The first frequency standard signal of the first channel is input into a phase-locked loop frequency divider, and the second frequency standard signal is output to the high-precision phase measurement module. The third frequency standard signal of the second channel is directly input into the high-precision phase measurement module to measure the phase difference between the high-frequency reference signal and the second frequency standard signal. The monitoring and processing platform outputs an updated control word through a fast discipline algorithm to correct the OCXO frequency standard source parameters. The fast discipline process continues until the OCXO frequency standard source stabilizes and the phase difference with the reference source converges, ending the fast discipline state.

The application discloses a ring oscillator and a phase-locked loop. The ring oscillator comprises: the output terminals of nth and mth delay units are connected to the main input terminals of (n+1)th and 1st delay units respectively; m is an odd number, the electrode polarity of the output terminal of the nth delay unit is opposite to the electrode polarity of the main input terminal of the (n+1)th delay unit, or the electrode polarity of the output terminal of the mth delay unit is opposite to the electrode polarity of the main input terminal of the 1st delay unit, m is an even number, the electrode polarity of the output terminal of the nth delay unit is the same as the electrode polarity of the main input terminal of the (n+1)th delay unit, or the electrode polarity of the output terminal of the mth delay unit is the same as the electrode polarity of the main input terminal of the 1st delay unit, n comprises an integer greater than or equal to 1 and less than m; the auxiliary input terminals of the (n+1)th and 1st delay units are connected to the main input terminals of the nth and mth delay units respectively. The technical scheme of the application can realize a ring oscillator with a high oscillation frequency.

This utility model belongs to the field of electronic circuit technology, specifically relating to a signal processing device and receiver. The signal processing device includes: a programmable controller, a reference clock signal acquisition module, a 10MHz crystal oscillator calibration module, and a 102.4MHz phase-locked loop (PLL) module. The reference clock signal acquisition module acquires a reference clock signal; the 10MHz crystal oscillator calibration module outputs the original 10MHz clock signal to the programmable controller, and the programmable controller feeds back a corresponding adjustment signal to the 10MHz crystal oscillator calibration module; and the 102.4MHz PLL module outputs a 102.4MHz clock signal. This utility model achieves real-time adjustment of the crystal frequency error, enabling the signal processing device to output a 102.4MHz clock signal at the ±1E-8 level, providing accurate acquisition and system clocks for digital processing devices, and meeting the high-precision requirements of signal acquisition and signal processing.

The invention discloses a control method and system for suppressing broadband oscillation of an energy storage system. According to the method, a self-adaptive control branch based on the phase locking principle is introduced into a current control loop of the energy storage converter, the oscillation frequency in a power grid is identified in real time, and a corresponding additional internal electromotive force signal is generated and superposed into an original control signal, so that the equivalent impedance characteristic of the energy storage converter is dynamically optimized, and the energy storage converter is optimized. And effective damping of broadband oscillation is realized. The method can adaptively track the changing oscillation frequency, does not need to modify the structure of a main circuit, can significantly enhance the system damping, effectively inhibits the broadband oscillation in a power electronic power grid, improves the stability of the power grid through the upgrade of a control algorithm, and has the advantages of low cost, easy integration and high adaptability.

The invention relates to the technical field of copper alloys, and particularly discloses a preparation system of a copper-chromium-zirconium alloy wire for a high-speed rail, which is used for solving the problems of boiling boundary phase locking, rewetting blocking and cooling speed banding, induction of spiral hot spots, performance discretization and monitoring misjudgment in the existing production process of the copper-chromium-zirconium alloy wire. The system comprises a production processing module, a sensing module, a spraying topology module, a phase analysis module, a boundary analysis module and a production analysis module. Through uniform time base of a partition setting table, a phase coherence characteristic table and a hydrothermal boundary characteristic table and partition fineness regulation and control driven by quantitative indexes, cooling banding caused by phase locking and rewetting blocking is inhibited, spiral hot spots and parameter discreteness are reduced, a cross-partition time sequence and a set boundary are unified, set convergence and switching consistency are improved, and the method is suitable for large-scale popularization and application. Misjudgment of low-frequency pseudo fluctuation monitoring is reduced, and control vectors are optimized in combination with performance specifications of the high-speed rail overhead line system.

The present application discloses a control method for a power factor of a flyback inverter during grid connection, and a controller. The method comprises: acquiring a working electrical signal of a target power grid; performing phase locking on the working electrical signal to obtain a voltage modulation wave signal; on the basis of a power factor angle corresponding to a preset power factor, performing phase shift on the voltage modulation wave signal to obtain a current modulation wave signal; selecting part of the waveform of the voltage modulation wave signal as a correction waveform of the current modulation wave signal in a corresponding time period; fusing the correction waveform with part of the waveform of the current modulation wave signal to obtain a corrected modulation wave signal waveform; and controlling a flyback inverter to output, to the target power grid or an electric device, a target alternating current corresponding to the corrected modulation wave signal waveform. By using the corrected modulation wave signal generated by the method of the present application to control the flyback inverter, accurate adjustment of the power factor of the flyback inverter during grid connection can be achieved, and harmonics are reduced.

The invention provides a path planning method and system for cooperative ball change of a neutron multi-ball spectrometer, and relates to the field of data processing. In the method, a real contact condition is obtained by superposing an irradiation field, a temperature field and a structural vibration field in a three-dimensional model, an attitude evolution law of a sphere in an initial contact state is extracted, and a phase-locked cone region and a phase-locked circulation track are calibrated; and dividing a far area, an approaching area and a phase-locked window area in the multi-ball stacking area according to the distance, the approaching area and the phase-locked window area so as to generate a macroscopic approaching path. In the execution process, a sensor is used for detecting initial contact, and a phase-locked circulation track is superposed in a phase-locked time window, so that the posture of the ball tends to be a stable posture attractor; after phase locking is completed, amplitude is gradually reduced, clamping force is increased, and stable locking is achieved. And finally, a complete ball changing path plan is obtained by fusing the local phase locking path and the macroscopic approaching path. By implementing the technical scheme, the problem that the ball changing task is influenced by the attitude degradation uncertainty of the ball in the initial contact state is solved.

The present disclosure provides a communication radar integrated optical fiber remote system and a phase locking method. A remote antenna unit is configured to receive a reflected microwave signal, and modulate the amplitude of the microwave signal to obtain an initial optical carrier signal. A dispersion compensation unit is connected with the remote antenna unit and configured to perform dispersion compensation on the initial optical carrier signal to obtain an optical carrier signal. A central unit is connected with the dispersion compensation unit and configured to perform phase locking using the received optical carrier signal to obtain an output optical signal. The frequency of the output optical signal is the same as that of the optical carrier signal, and the phase of the output optical signal is the same as that of the optical carrier signal. A signal output unit is connected with the central unit and configured to output the output optical signal. The present disclosure realizes the consistency of the frequency and the phase synchronization of the output optical signal and the optical carrier signal, realizes low phase noise carrier recovery, and improves the communication and radar performance.

The application discloses a DSOGI phase-locked loop control method, system, device and storage medium. The DSOGI phase-locked loop control method converts the obtained three-phase power grid voltage signal into a two-phase quadrature voltage signal, processes the two-phase quadrature voltage signal by using SOGI, generates a plurality of quadrature components, and separates the quadrature components into positive and negative sequences to obtain separated positive and negative sequence components. Then, a positive and negative phase sequence switching selection unit receives the two-phase quadrature voltage signal, the positive sequence component, the negative sequence component and the angular velocity of the DSOGI phase-locked loop. Based on a preset judgment condition, the unit selects one from the two-phase quadrature voltage signal, the positive sequence component and the negative sequence component to perform a closed-loop phase-locked operation, realizes adaptive positive and negative phase sequences, can adapt to a wide frequency range, and can adapt to the case that the power grid voltage is unbalanced and contains high-order harmonics.

This application discloses a grid-connected inverter control method based on a notch filter phase-locked loop (PLL) for weak grid conditions. The method first designs a notch filter with adjustable notch depth and bandwidth, setting its notch frequency to the grid power frequency. It then acquires the three-phase voltage at the grid connection point, subtracts the voltage after notching, and extracts the power frequency component of the three-phase voltage. The power frequency component is phase-locked in a synchronous reference frame to obtain the modulation wave phase signal. The inverter output voltage and current are acquired, and active and reactive power are calculated. A dual closed-loop control circuit with an outer power loop and an inner current loop is constructed, outputting the modulation wave voltage amplitude signal. Finally, the modulation wave phase signal and amplitude signal are combined to generate a pulse modulation wave signal. Thus, this invention can accurately lock the grid phase when the weak grid voltage contains harmonics and DC components, effectively improving the stable grid-connected operation capability of the grid-connected inverter under large disturbances.

The application claims a MEMS frequency accurate tracking and locking method based on a resonant phase-locked loop (R-PLL). The application relates to the technical field of MEMS (micro-electro-mechanical system) resonator control and frequency tracking, and the method takes the output of a voltage-controlled oscillator as an interference signal, takes the physical response (such as weak electromagnetic leakage or acoustic radiation) of a disturbed MEMS device as a feedback signal, compares the phase difference between the feedback signal and a reference signal through a phase detector, adjusts the interference frequency, and forms a closed-loop locking system. The application adjusts the interference source frequency through a phase detector and a filter, can track the target resonant frequency drift caused by factors such as temperature change in real time, makes the MEMS resonator keep in a phase-locked state with the target resonant frequency, and ensures that the interference energy is always efficiently coupled.

The application discloses a micro-grid island detection method and system, electronic equipment and a storage medium, comprising: phase-locked processing of a three-phase voltage signal, obtaining an instantaneous phase sequence and constructing a phase increment fluctuation sequence; the numerical distribution probability of the phase increment fluctuation sequence in a preset sliding time window is counted, and a phase fluctuation dynamic entropy value is calculated. The active power signal of the point of common coupling is extracted, the active power fluctuation rate sequence is constructed, and the power fluctuation dynamic entropy value is calculated based on the sliding time window; according to the moving average value of the entropy value in the historical time period, the phase fluctuation determination threshold and the power fluctuation determination threshold are updated. When the voltage amplitude and frequency of the point of common coupling are both in the preset normal operation interval, if the phase fluctuation dynamic entropy value is greater than the phase fluctuation determination threshold or the power fluctuation dynamic entropy value is greater than the power fluctuation determination threshold, it is determined that the island effect occurs, and a trip control signal is output. The application can eliminate the power balance blind area and has strong noise resistance.

This invention provides an acoustic wave sensing system based on master-slave laser phase-locked loop (PLL). A frequency-locking unit locks the frequency difference between the master and slave lasers to a highly stable reference frequency source, thus separating the acoustic wave signal from the background noise. The slave laser is then exposed to the acoustic field under test, and its output light frequency and phase are modulated accordingly by acoustic wave disturbances. The master and slave lasers generate a heterodyne beat frequency optical signal via a beam combining unit. A phase comparison unit compares this beat frequency electrical signal with a reference radio frequency signal to generate an error signal proportional to the instantaneous phase difference. A servo control unit conditions and amplifies the error signal, driving a tuning unit to adjust the output frequency and phase of the slave laser in real time, forming a negative feedback closed loop. The adaptive compensation characteristics of the closed-loop control give the system a strong ability to suppress slowly varying interferences such as environmental temperature changes and mechanical vibrations.

The present application relates to the technical field of geophysical electromagnetic exploration data processing, and specifically discloses a kind of orthogonal digital phase-sensitive detection time-frequency electromagnetic complex response extraction method, automatically extracts base frequency and initial phase using transmitter stored time-stamped current data, constructs zero initial phase orthogonal reference signal, carries out two-way digital phase-sensitive detection to receiver full waveform sampling data, obtains in-phase component and quadrature component, so as to calculate the complex response amplitude and phase information of target frequency.The present application does not need analog phase-locked loop and artificial phase modulation process, can stably extract complex response parameters under strong interference and strong noise background, is especially suitable for array time-frequency electromagnetic receiver full waveform sampling data post-processing, without transmitting current waveform to each receiving node in real time, improves the flexibility and scalability of time-frequency electromagnetic system.

A method and device for parallel phase-locked loop (PLL) amplification of weak signals using FPGA multi-channel parallel processing is disclosed, relating to the field of digital signal processing technology. This method aims to improve the parallel processing capability of FPGA processing devices in extracting useful signals from strong noise backgrounds with limited hardware costs. In this method, the FPGA processing device generates a shared phase reference for all channels by employing a globally unified sampling counter and modulo-N addressing, and distributes it using a broadcast bus. This saves the significant logic resources consumed by traditional schemes that require independent configuration of phase accumulators for each channel. Furthermore, by utilizing a general-purpose logic array to implement integer multiplication instead of relying on a limited number of dedicated DSP hard cores, the parallel processing capability of the FPGA processing device in extracting useful signals from strong noise backgrounds is improved with limited hardware costs.

The embodiment of the invention provides a dual-phase-discriminator phase-locked loop control method and a grid-connected inverter, and the method comprises the steps: obtaining the voltage of a power grid, and determining the sampling frequency of the voltage of the power grid; determining at least one sampling period according to the sampling frequency; determining phase sine values and phase cosine values of a plurality of sampling periods according to the power grid voltage; determining a first phase difference signal through a first phase discriminator; determining a matching frequency and an output phase value corresponding to the matching frequency according to the first phase difference signal; determining a second phase difference signal through a second phase discriminator; determining a total phase adjustment amount according to the first phase difference signal and the second phase difference signal; and determining a phase-locked phase value according to the total phase adjustment quantity so as to update the output phase value. According to the scheme of the invention, high-stability technical guarantee is provided for realizing grid connection of high-performance energy storage equipment.

The application discloses a plane grating full-parameter testing system and a measuring method. The system comprises a light source system, a double-layer rotating motion system, a phase-locked system, a monitoring system and a measurement and control system. The light source system comprises an adjustable monochromatic light source module and a frequency-stabilized narrow-line-width laser module. The adjustable monochromatic light source is used for diffraction efficiency measurement, and the frequency-stabilized narrow-line-width laser is used for stray light and period measurement. The double-layer rotating motion system is used for separately controlling a to-be-measured grating and a detector, and is used for angle and translation adjustment. The phase-locked system is used for weak signal measurement. The monitoring system is used for accurately positioning a grating rotation angle. The measurement and control system is used for completing light source control, motion control, signal acquisition, parameter calculation and result output. The application can realize integrated measurement of plane grating diffraction efficiency, stray light and period parameters.

The invention discloses a bidirectional optical parameter phase-sensitive amplifier system for high-precision optical frequency transmission, which comprises an uplink transmission link, a downlink transmission link and a detection link, the uplink transmission link is used for amplifying an optical signal when the optical signal to be amplified is input from the first optical signal input / output port and outputting the optical signal from the second optical signal input / output port; the downlink transmission link is used for amplifying an optical signal when the optical signal to be amplified is input from the second optical signal input / output port and outputting the optical signal from the first optical signal input / output port; and the detection link is used for performing beat frequency measurement and phase locking on an optical signal input from the first optical signal input / output port and an optical signal input from the second optical signal input / output port so as to eliminate extra noise introduced due to different transmission paths in the uplink and downlink amplification process. According to the invention, an extremely low noise amplification effect can be realized, the signal-to-noise ratio loss generated in the transmission process is effectively reduced, and the transmission distance is increased.