612 results about "Integrator" patented technology

The invention discloses a three-level inverter dual-tracking model prediction control method and an inverter, and the method comprises the steps: constructing an integral sliding mode observer, and obtaining a current prediction value and a lumped disturbance estimation value through the integral sliding mode observer; calculating a voltage error of the inverter, and substituting the voltage error into the PI controller to obtain a voltage tracking control item; based on the voltage tracking control term, a switching state that minimizes the cost function is selected to control the inverter. The integral sliding mode observer is configured to calculate a current prediction error between a current prediction value of a current control period and a system output current, introduce an integrator to track the current prediction error, and generate an error function based on an output result of the integrator and the current prediction error. And feeding back a current predicted value and a lumped disturbance estimated value of the next control period through an error function. According to the invention, the method can achieve the quick estimation of the operation state of the inverter and the robust compensation of disturbance, reduces the steady-state tracking error, and reduces the total harmonic distortion of the inverter.

The invention discloses a self-adaptive harmonic current suppression method for harmonic waves of a photovoltaic inverter, which belongs to the technical field of power quality control of a power system and comprises the following steps of: compensating a control strategy through a self-adaptive harmonic component of the photovoltaic inverter by adopting a'detection-reverse injection 'framework; the difference between the residual apparent capacity of the inverter after fundamental wave power supply and the borne harmonic power is used as an adaptive quantity, and the total harmonic distortion rate of the grid-connected point is reduced to the maximum extent on the premise of no overload; the method comprises the following steps: firstly, constructing a real-time harmonic detector based on a cascade generalized integrator; secondly, an inverter impedance model is established from the aspect of impedance stability, and a control parameter stability boundary is determined; then, a self-adaptive harmonic control strategy is introduced into the single-inverter grid-connected system, and a reasonable parameter setting method is provided on the basis of considering stability limitation; afterwards, a capacity-matched harmonic power distribution algorithm is provided for a multi-inverter parallel system, and the efficiency and operation stability of a photovoltaic grid-connected power generation system are improved.

A dual path PLL provides excellent output phase stability over PVT variations, without implementing a high accuracy TDC. A digital integral path employs a binary phase detector, comparing the reference and feedback signals, and an integrator to generate an oscillator control input to lock the long-term output phase to the reference signal. An analog proportional path employs a linear (e.g., edge triggered) phase detector and a charge pump and filter to generate an oscillator control input to mitigate phase noise in the output signal. The feedback signal to the proportional path is delayed, which has the effect of increasing the width of phase error pulses, and moving the charge pump operating point away from the zero point where it generates both positive and negative currents, which are difficult to match. A second linear phase detector in the proportional path compensates for the increased phase error pulse width by comparing the delayed and non-delayed feedback signals, and generating pulses in the opposite direction.

The invention provides a dynamic residual amplification circuit based on charge sampling, and relates to the technical field of integrated circuits, the dynamic residual amplification circuit comprises an integrating circuit, a logic circuit, a charge pump and a zero-cross detection circuit, the integrating circuit is connected with the logic circuit and the zero-cross detection circuit, the integrating circuit converts a sampled input differential signal into a constant current, and the constant current is connected with the charge pump. The output node is continuously charged or discharged, so that the input differential signal is converted into a current integral quantity; the zero-cross detection circuit monitors the output voltage of the integrating circuit in real time, and when the output voltage is greater than or equal to the common mode voltage VCM, the moment when the output voltage is equal to the common mode voltage VCM is converted into a digital clock edge; the logic circuit is connected with the charge pump and outputs digital pulses to the charge pump according to the digital clock edge so as to control the reset time sequence of the whole dynamic residual amplification circuit; the charge pump is configured to output a residual voltage modulated by the digital pulse in response to the digital pulse. The application helps to improve the linearity of the residual signal.

The invention relates to an integrator circuit for eliminating thermal noise and a Delta-sigma modulator, and belongs to the technical field of electronic signal processing, the modulator comprises at least two stages of integrators, a quantizer, a feedback DAC and an adder; the integrator comprises an integrator circuit, and the integrator circuit comprises a sampling module for sampling an input signal source; the double-path multi-phase clock control pre-amplification auxiliary storage circuit module alternately samples and stores thermal noise voltage and offset voltage; the integral amplifier is used for amplifying a signal output by the double-path multi-phase clock control pre-amplification auxiliary storage circuit module; and the integrating capacitor is connected between the integrating amplifier and the two-way multi-phase clock control pre-amplification auxiliary storage circuit module, and feeds back the signal after integration processing to the two-way multi-phase clock control pre-amplification auxiliary storage circuit module to realize signal modulation and noise shaping. The thermal noise introduced in the sampling process is effectively reduced, and the area of the whole chip is reduced while the signal-to-noise ratio is improved.

The invention provides a VCO digital circuit control method and system with temperature compensation, and relates to the technical field of circuit control, and the method comprises the steps: obtaining VCO output frequency and real-time temperature, and calculating an initial frequency deviation; correcting the frequency deviation based on the temperature compensation coefficient, and generating a temperature-frequency deviation characteristic curve; an optimal compensation factor is determined through Monte Carlo sampling; calculating a compensation parameter adaptive weight by using Bayesian iteration, and dynamically adjusting a compensation factor; and a control signal is generated through the digital integrator to realize frequency calibration. According to the invention, the high-precision frequency stability of the VCO under the temperature change condition is realized, and the circuit reliability is improved.

The invention provides a diagnosis method and system suitable for magnet current in a quasi-ring symmetrical star simulator, and relates to the technical field of star simulators, and the method comprises the steps: setting a target voltage range, and finally outputting the mutual inductance coefficient, total number of turns and sectional area parameters of a coil; utilizing an electromagnetic induction conversion algorithm to generate an original measurement signal; an original measurement signal is input into an integrator through a shielded wire to obtain a proportional voltage which is strictly proportional to the current, and the proportional voltage is transmitted to a data acquisition interface; performing analog-to-digital conversion on the proportional voltage received by the acquisition interface to generate a discrete sequence, calculating a conversion coefficient by combining a target mutual inductance coefficient and a fixed time constant, and finally restoring a digital current signal; and inputting the digital current signal to an upper computer to realize dynamic waveform display, and outputting key boundary parameters to a plasma experiment module. The method has the advantages that the method can adapt to complex changes of magnet current, and enough measurement precision and response speed can be provided in a low-parameter experiment.

A digital microphone includes at least one integrator; a state detection and parameter control component directly coupled to an output of the integrator; and a signal processing component coupled to an output of the state detection and parameter control component, wherein a parameter of the signal processing component includes a first value in a first operational mode and a second value in a second operational mode different from the first operational mode.

The invention discloses a six-degree-of-freedom multi-spacecraft control experiment platform and method based on semi-physics-virtuality, belongs to the technical field of spacecraft system and control system simulation, and constructs a multi-spacecraft system composed of semi-physics spacecrafts and pure virtual spacecrafts. The attitude of the semi-physical spacecraft is simulated by a simulator mounted on a three-dimensional attitude air floating table, is acquired by a sensor and is converted into a rotation matrix form, and a translation part of the semi-physical spacecraft is virtually calculated through a simulation integrator; the pose of the virtual spacecraft is virtually simulated by an SE (3) integrator with high-guarantee geometric characteristics; the system takes the ROS as a communication framework, and realizes state and instruction release by adopting a custom message; and ensuring that the time system of each spacecraft is consistent with the real time through a time synchronization mechanism. The platform supports cooperative operation of a semi-physical spacecraft and a pure virtual spacecraft, and has the characteristics of flexible structure, high simulation precision and good expandability.

The invention discloses a motor adaptive harmonic suppression system and method fused with LSTM prediction, and belongs to the technical field of power electronic control. Comprising a harmonic feature extraction module, a trapezoidal angle prediction module, an integral adjustment module and a trapezoidal voltage compensation module. The harmonic feature extraction module converts the three-phase current into dq-axis current; the trapezoidal angle prediction module establishes a model for predicting an optimal initial trapezoidal angle based on a long short-term memory neural network according to the d-axis harmonic current, the motor rotating speed and the bus voltage; the integral adjusting module adjusts a trapezoidal angle on line by inputting a harmonic error; and the trapezoidal voltage compensation module is used for modulating trapezoidal compensation voltage and outputting compensation voltage required by an alpha axis and compensation voltage required by a beta axis. According to the invention, prediction of the long-short-term memory neural network and online adjustment of the trapezoidal angle and modulation of the trapezoidal compensation voltage of the integrator are fused, the harmonic current of the permanent synchronous motor control system can be effectively inhibited, the torque ripple of the motor is reduced, and the performance of the motor is improved.

The invention relates to power semiconductor device on-line monitoring and power electronic system control, in particular to a SiC MOSFET conduction current extraction circuit and method, high-frequency oscillation interference is effectively suppressed through a second-order passive RC filter circuit, a measurement error less than or equal to 1.5% is realized within a current range of 50A-300A in combination with an accurate mathematical model established by a depth symbol optimization algorithm, and the measurement accuracy is improved. The requirement of the intelligent gate driver on high-precision current feedback is met, and the measurement precision is remarkably improved; the pulse width direct analysis technology is adopted, a traditional active integrator and a digital decoding link are omitted, the system response delay is smaller than or equal to 500 ns, microsecond-level over-current protection can be supported, the response speed and the real-time performance are optimized, and the system safety in a high-frequency application scene is remarkably improved.

The invention relates to a ripple suppression PI loop control method, a storage medium and a device, and the method comprises the steps: extracting a frequency doubling component in an inversion power flow based on the filtering and Park transformation of a secondary second-order generalized integrator, determining the reverse compensation amount at each moment based on the frequency doubling component and a battery connected with a DC circuit, and carrying out the control of the ripple suppression PI loop. And finally, based on the sum of the reverse compensation amount at each moment and an original reference current value output by a voltage outer ring on each bridge arm of the DC circuit, determining a current reference instantaneous value after reverse compensation of a current inner ring input to each bridge arm at each moment. According to the method, a pure frequency doubling component with very high dynamic performance and related to ripple information is obtained, then according to the extracted frequency doubling component and battery parameters, the reverse compensation amount used for suppressing ripple in loop control is obtained, and then the reverse compensation amount is accumulated to a voltage outer loop, so that the ripple information is suppressed. Therefore, ripple suppression with good dynamic performance and good suppression effect in loop control is realized.

A calibration circuit for correcting timing errors introduced by a DAC in a signal path of an ADC, the calibration circuit comprising: an input subtraction module configured to subtract an estimated error from an output of the ADC and provide a corrected output; a filter module configured to approximate an error transfer function corresponding to the DAC timing errors; a correlation module configured to correlate the corrected output with an output from the filter module to extract an error term; an integrator module configured to integrate the error term to provide an updated error coefficient; and a correction module configured to correlate the updated error coefficient with the output from the filter module to provide the estimated error to the input subtraction module.

The invention provides a phase error correction method for an inductive position sensor. The device is characterized by consisting of a first group of multipliers (1), a sliding window integrator (2) for solving a signal average value in a period of time, a second group of multipliers (3) and an adder group (4). The method can be used for correcting and eliminating the phase error in the inductive position sensor chip circuit, and can be widely applied to the fields of industrial robots, automobile manufacturing, industrial automation and the like.

The invention discloses a single-phase phase-locked loop system capable of intelligently adjusting parameters, and the system comprises a spectrum analysis unit which outputs a fundamental wave frequency fc, a fundamental wave angular velocity omega c, and a cascade delay signal elimination parameter ni; the self-adaptive single-phase phase-locked loop unit comprises a third-order generalized integrator, a dq converter, a cascade delay signal canceller CDSC, a PI controller, an integrator and a modulus taking device, and the cascade delay signal canceller CDSC takes a fundamental wave frequency fc as a reference frequency and takes a fundamental wave angular velocity omega c as a reference angular velocity of an input end of the integrator; an angular velocity increment delta omega output by the PI controller and a fundamental wave angular velocity omega c are added to jointly determine a phase locking angle theta, and a proportionality coefficient kp and an integral coefficient ki of the PI controller are refreshed online from the outside and take effect immediately; and the control parameter intelligent optimization unit is used for iteratively solving the optimal [kp, ki] based on a mirage search optimization algorithm MSO and writing the optimal [kp, ki] into the nonvolatile memory. According to the single-phase phase-locked loop system capable of intelligently adjusting the parameters, manual parameter adjustment is avoided, and phase locking is rapid, accurate and stable for a long time.

The invention belongs to the field of energy storage and power generation combination, and provides a hybrid energy storage and power generation combined power control system and method, and the system comprises a power generation unit, a hybrid energy storage unit, a detection unit, a dynamic frequency response unit, a self-adaptive median calibration unit, and a combined system cooperative control unit. The dynamic frequency response unit dynamically distributes a power instruction based on a power grid frequency deviation delta f and a real-time inertia constant H: when delta f / delta fthgt; one hour power type energy storage is 100% in response; 0.5 lt; when delta f / delta fth is less than or equal to 1, distributing according to a ratio of 7: 3; and when delta f / delta fth is less than or equal to 0.5, the power type energy storage bears all delta P. The self-adaptive median calibration unit adjusts an SOC target value in real time through a dynamic median generator, and power type energy storage out-of-limit locking is avoided in combination with a deviation integrator and a safety boundary protector. And the combined control unit cooperates with multi-source output to realize economic dispatching and frequency stability. The problems of hybrid energy storage dynamic distribution, SOC real-time calibration and multi-source cooperative control are solved.

The invention discloses a harmonic suppression method and system based on feedforward control and virtual impedance, and belongs to the field of electric energy quality control, and the method comprises the steps: constructing a harmonic extraction model based on the cascading of double third-order generalized integrators, and obtaining a voltage harmonic component based on the harmonic extraction model and real-time power grid data; based on a preset power outer loop control strategy, a preset voltage and current double closed loop control strategy, a preset harmonic voltage feed-forward control strategy and the voltage harmonic component, constructing a network construction type charging pile control model, and obtaining an initial output current; obtaining each virtual impedance based on the initial output current, the harmonic extraction model and the voltage harmonic component; and obtaining a harmonic suppression model based on each virtual impedance and the network construction type charging pile control model, so as to obtain a harmonic suppression output current based on the harmonic suppression model and the real-time power grid data. According to the harmonic suppression method and system based on feedforward control and virtual impedance provided by the invention, grid-connected output current harmonics controlled by a network-forming type charging pile are effectively suppressed.

Disclosed is a system to influence detectability of a target object by machine perception. The system receives input data that includes a representation of the target object and an objective corresponding to reduce detectability or induce a designated detection of that object. The system generates a plurality of candidate adversarial patterns based on the objective for the object. For each candidate adversarial pattern, the system simulates an integration of the target object in a virtual environment across a plurality of sensor modalities. The system evaluates each simulated pattern against a plurality of sensor modalities and calculates a performance metric for each candidate. The system determines whether the metric reaches a predetermined threshold level for the objective. If not, it iteratively adjusts the candidate to converge on an optimized output adversarial pattern. If so, it confirms the pattern as optimized and compiles it for output.

Wireless circuitry can include a radio-frequency amplifier configured to operate in a plurality of different mode, configuration, or bias settings, a power detector coupled to an output of the radio-frequency amplifier, a plurality of power integrators, and a switching circuit having an input configured to receive a measured power level from the power detector and having outputs coupled to the plurality of power integrators. The switching circuit can have a switch state that is adjusted based on a current mode, configuration, or bias setting for the radio-frequency amplifier. The power integrators may be part of multiple power control loops. The power control loops can be coupled to additional switching circuitry activated based at least party on the current mode, configuration, or bias setting and a subsequent mode, configuration or bias setting for the radio-frequency amplifier.

The invention relates to the technical field of integrating instruments, in particular to a multi-interface heat flow integrating instrument, which comprises a multi-system input interface unit, and is characterized in that pulse signals, 4-20mA current signals and differential voltage signals are accessed through a phoenix terminal array; the input end of the heterogeneous switch matrix is electrically connected with the output end of the multi-system input interface unit, and the heterogeneous switch matrix is used for matching signal types and frequency bands of output signals of different types of sensors; and the input end of the optomagnetic double-coupling driving module is connected with the control port of the heterogeneous switch matrix, so that the signal integrity and the system safety are improved. Compared with the prior art, by arranging the multi-system input interface unit, the standby power consumption is greatly reduced, the system response speed is improved, the structure has the characteristics of high adaptability, high compatibility and low power consumption, and a high-reliability and intelligent access platform is provided for parallel deployment of various heat flow sensors.

The adder sets a voltage upper limit value (VU) by adding a first voltage to a sinusoidal reference voltage (VREF) having a frequency and a phase consistent with an AC voltage (VI). The first integrator time-integrates a first deviation (VI-VU) of an instantaneous value of the AC voltage (VI) from a voltage upper limit value (VU) if the instantaneous value of the AC voltage (VI) exceeds the voltage upper limit value (VU). The voltage rise detection circuit detects a voltage rise of the AC voltage (VI) when a first integral value of the first integrator exceeds a first threshold value. The subtractor sets the voltage lower limit value (VL) by subtracting the second voltage from the reference voltage (VREF). The second integrator time-integrates a second deviation (VI-VL) of the instantaneous value of the AC voltage (VI) from the voltage lower limit value (VL) when the instantaneous value of the AC voltage (VI) is below the voltage lower limit value (VL). The voltage drop detection circuit detects a voltage drop of the AC voltage (VI) when the second integral value of the second integrator exceeds a second threshold value.

A photometric process measurement arrangement and a photometric measurement method The invention refers to a photometric process measurement arrangement (10) comprising a photometric immersion probe (20) comprising a photometer flashlight source (61) for providing photometric light impulses, a photometric detector arrangement (70) comprising a separate wavelength-selective detection element (71, 72, 73), and a photometer control (80) controlling the photometer flashlight source (61) and the detector arrangement (70), The photometer control (80) comprises: An impulse signal integrator (819, 829, 839) for integrating the electric impulses having the impulse intensity (Ui) generated by the detection element (71, 72, 73) of one impulse integration cycle (204; 221; 264), a measurement cycle control (90) for adapting the total number of 20 integrated cycle impulses of an impulse integration cycle (204;221;264) to the impulse intensity (Ui) of the single electric impulses, an A / D-converter (81, 82, 83) for converting the voltage of the impulse signal integrator (819, 829, 839) in an optional compulsory A / D conversion interval (100) after the impulse integration cycle (204;221;264), and an A / D-conversion management module (150) for balancing the total number of A / D conversion intervals (100-111) within a time frame (F), whereas the number of supplementary A / D conversion intervals (101-111) after the compulsory A / D conversion interval (100) depends on the length of the corresponding impulse integration cycle (204; 221; 264).

The invention belongs to the technical field of electronic power, and particularly relates to an LCL grid-connected inverter model-free predictive current control system and method based on sampling noise compensation, and the system comprises an inverter main circuit, an LCL filter and a controller. The controller is configured to firstly calculate a current gradient and a voltage gradient according to a collected system operation signal; then, a second-order generalized integrator is used for conducting accurate compensation on sampling noise contained in the gradient; and finally, executing a model-free predictive control algorithm based on the compensated gradient, and preferably selecting an optimal voltage vector through a multi-objective value function integrating inverter side current, capacitor voltage and network side current. According to the method, sampling noise interference is effectively suppressed, the control precision and the anti-interference capability of the system are improved, and stable and efficient operation of the LCL grid-connected inverter can be realized without additional damping.

The invention discloses a network construction type power synchronization control method and device, electronic equipment and a storage medium, which are used for solving the technical problem that the current network construction type power electronic equipment power control means cannot completely eliminate the negative sequence active power influence and the control effect is poor. The method comprises the following steps: acquiring a three-phase electric signal of the network construction type power electronic equipment; positive and negative sequence separation decoupling based on a double-second-order generalized integrator is carried out on the three-phase electric signal to obtain a dq-axis positive and negative sequence electric signal; calculating positive and negative sequence active power according to the dq-axis positive and negative sequence electric signals; and performing power synchronous control considering negative sequence power correction according to the positive and negative sequence active power, and outputting the frequency and the phase angle of the network construction type power electronic equipment.

The invention provides a diagnosis method and system for plasma energy storage in a quasi-ring symmetric star simulator, and relates to the technical field of star simulators, and the method comprises the steps: adjusting a temperature drift resistor of a diamagnetic differential integrator, executing a quasi-ring symmetric configuration vacuum field magnet coil power-on test according to a general discharge waveform, and completing the calibration of the diamagnetic differential integrator; respectively measuring and calculating the compensation coefficient of each magnet coil; carrying out a power-on experiment with the same coil configuration parameters in the plasma discharge experiment of the quasi-ring symmetric star simulator test device under a vacuum condition to obtain wall eddy current stray field data under a corresponding condition; the real diamagnetic flux in the plasma discharge experiment is calculated by combining the magnet coil compensation coefficient and the wall eddy stray field data; and real plasma energy storage information in plasma discharge is obtained through calculation. The device has the beneficial effects that the measurement precision of the plasma energy storage signal in the star simulator device is improved, and experimental data support is provided for the physical research of the plasma of the star simulator.

The invention discloses a deadbeat predictive current control method based on a composite disturbance observer, and belongs to the technical field of dual three-phase permanent magnet motor control. The dual three-phase permanent magnet motor is composed of two sets of stator three-phase windings, and the space phase shift angle is 30 degrees. The method comprises the following steps: establishing a discretized motor model containing total disturbance under a double-dq coordinate system; a composite disturbance observer is designed, and direct current disturbance and alternating current disturbance are synchronously estimated through a second-order disturbance expansion state observer embedded into a generalized integrator; and performing feed-forward compensation by using the disturbance estimation value, and calculating a voltage control quantity in combination with deadbeat prediction. By introducing the second-order disturbance expansion state observer and the generalized integrator, synchronous compensation of direct current disturbance and alternating current disturbance is realized, so that current harmonics are effectively reduced, and the current waveform quality is improved. Meanwhile, complete decoupling of the current control loop and the disturbance suppression loop is realized. In addition, the method still shows high robustness under the condition of motor parameter mismatch.

The invention refers to a photometric process measurement arrangement (10) with a photometric immersion probe (20). The photometric immersion probe (20) comprises a photometer flashlight source (61) for providing photometric light impulses, a photometric detector arrangement (70) comprising at least two separate wavelength-selective detection elements (71, 72, 73), and a photometer control (80) controlling the photometer flashlight source (61) and the detector arrangement (70). The photometer control (80) comprises several impulse signal integrators (819, 829, 839) for integrating the electric impulses generated by the detection elements (71, 72, 73), several A / D-converters (81, 82, 83) for converting the voltages of the impulse signal integrators (819, 829, 839) when high-precision-converting trigger ports (H) of the A / D-converters (81, 82, 83) are triggered, and a measuring cycle control (90) with an integration target memory (94) memorizing an integration target voltage value (Ut). The photometer control (80) is provided with a high-precision-request port (93) for synchronously triggering the high-precision-converting trigger ports (H) of all A / D-converters (81, 82, 83) after the voltage of the first of all impulse signal integrators (819, 829, 839) has exceeded the memorized integration target voltage value (Ut).

The invention relates to the technical field of motor insulation state monitoring, and discloses a motor winding turn-to-turn discharge monitoring method and device based on Rogowski coils. The high-pass integrator is matched to carry out integral operation on coil output signals in a centralized mode to obtain high-frequency discharge current data, then fault characteristic quantity is constructed based on the data, the fault position of the motor cable is determined, an independent monitoring module does not need to be configured for each phase of cable, and the single high-pass integrator can complete centralized processing of multi-coil signals. Not only is the use amount of core monitoring parts greatly reduced to reduce the monitoring cost, but also the hardware layout is remarkably simplified to save the installation space, and meanwhile, the data processing nodes are reduced to reduce processor resource occupation, and the problems of high monitoring cost, large space and resource consumption and low monitoring efficiency in the prior art are effectively solved.

An analog frontend architecture for a capacitive pressure sensor. The analog frontend architecture includes a low-noise amplifier unit for low-noise amplification of sensor signals of the capacitive pressure sensor, the low-noise amplifier unit including a first integrator unit and a second integrator unit, the first integrator unit being connected to input terminals of the low-noise amplifier unit, being designed as a boxcar integrator, and being configured to amplify sensor signals of the capacitive pressure sensor according to the boxcar integration technique, and the second integrator unit being connected to output terminals of the low-noise amplifier unit and being configured to integrate the amplified voltage signals of the first integrator unit.

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.