CN-121978408-A - Rapid detection method for phase angle of power grid voltage

CN121978408ACN 121978408 ACN121978408 ACN 121978408ACN-121978408-A

Abstract

The invention relates to the technical field of electric power system measurement and discloses a method for rapidly detecting a phase angle of a power grid voltage, which has the technical scheme that photons are sampled at a super speed and subjected to space-time super-resolution coding, the phase angle is directly solved by photon parallel operation, the photons are self-adaptively calibrated, and the photons are output in a compatible way; the method comprises the steps of carrying out ultra-high-speed sampling on a power grid voltage signal by utilizing a photon analog-digital converter, constructing a photon feature matrix by space-time super-resolution coding, directly solving the instantaneous phase angle at each sampling moment by utilizing a parallel photon interference array, carrying out photon domain moving average to inhibit noise, carrying out self-adaptive calibration on an initial detection value under a dynamic working condition by adopting a photon neural network, improving detection precision and robustness by utilizing an online weight updating and feedback optimizing mechanism, and finally converting a photon domain detection result into a standard electric signal to be output by utilizing a photon-electron compatible output module, thereby realizing real-time, high-precision and strong self-adaptive detection of the phase angle.

Inventors

YIN ZHENJIE
LI JINBO
WANG JINMEI
YIN JIANMING
LI HAIJIE
ZHU MING

Assignees

宁夏大学

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. A method for rapidly detecting a phase angle of a grid voltage, the method comprising the steps of: S1, photon ultra-high-speed sampling and space-time ultra-resolution coding, namely ultra-high-speed sampling is carried out on a power grid voltage analog signal by adopting a photon analog-to-digital converter, a photon pulse stream is generated, space-time ultra-resolution coding is carried out on the photon pulse stream, and a 'time-space-polarization' three-dimensional photon feature matrix containing voltage time sequence, amplitude and phase information is constructed; s2, directly solving the phase angle by photon parallel operation, namely inputting the three-dimensional photon feature matrix into a photon linear operation array based on a silicon-based photon chip, parallelly solving the instantaneous phase angles of all sampling moments in a photon domain through photon interference, carrying out photon domain sliding average processing on the instantaneous phase angle sequence, and outputting an initial detection value of the phase angle; S3, photon self-adaptive calibration, namely based on a photon neural network integrated with a photon linear operation array on the same silicon-based photon chip, receiving the initial detection value of the phase angle and the dynamic working condition characteristic parameters acquired in real time, carrying out online reasoning and weight updating through a pre-trained phase deviation compensation model, calibrating the initial detection value of the phase angle, and outputting an accurate phase angle detection value; and S4, photon-electron compatible output, namely converting photon signals corresponding to the accurate phase angle detection values into electric signals through a photon detection array, and outputting the electric signals to a power grid control system after signal conditioning, analog-to-digital conversion and communication protocol encapsulation.
2. The method for rapidly detecting a phase angle of a grid voltage according to claim 1, wherein the space-time super-resolution encoding in S1 comprises: s1.1, time dimension coding, namely mapping sampling time to a photon pulse time stamp; S1.2, space dimension coding, namely coupling voltage amplitude values and instantaneous phases of all sampling moments to photon polarization state parameters through coding coefficients; S1.3, constructing the three-dimensional photon feature matrix based on the time stamp and the polarization state parameter.
3. The rapid detection method of the grid voltage phase angle according to claim 1, wherein the photon linear operation array in S2 comprises P photon interference units which are arranged in parallel, wherein P is equal to the total number N of sampling points of the three-dimensional photon feature matrix; each photon interference unit comprises a photon beam splitter, a phase modulator, a photon coupler and a photon intensity detector, and is used for processing the coded data of a single sampling point.
4. The method for rapidly detecting a phase angle of a power grid voltage according to claim 1, wherein the step S2 of solving the instantaneous phase angle of each sampling time in parallel is specifically as follows: each photon interference unit splits input photon pulse to an in-phase interference branch and a quadrature interference branch, and calculates an instantaneous phase angle through photon intensity values output by two paths of interference The calculation formula is as follows: ; Wherein, the And The photon intensities output by the in-phase branch and the quadrature branch respectively, And For conversion coefficients determined by off-line calibration.
5. The method for rapidly detecting the phase angle of the power grid voltage according to claim 1, wherein the photonic neural network in the step S3 is a layered photonic synaptic architecture, and comprises an input layer, a hidden layer and an output layer; The dynamic working condition characteristic parameters at least comprise the change rate of output power of the power generation system, the fluctuation amount of the amplitude value of the power grid voltage, the angular frequency offset of the power grid voltage and the change rate of the initial detection value of the phase angle.
6. The method for rapidly detecting a phase angle of a grid voltage according to claim 1, wherein the online weight updating in S3 is specifically implemented by dynamically adjusting a photon synaptic weight based on a phase angle error detected in real time, and the updating formula is as follows: ; Wherein, the And Photon synaptic weights after and before updating respectively, For the weight update step size, As a result of the phase angle error, Is the phase angle deviation predicted value.
7. The method for rapidly detecting a phase angle of a grid voltage according to claim 1, wherein S3 further comprises performing constraint and truncation processing on the updated weight to ensure that the updated weight is within a preset weight constraint interval determined by physical properties of the photonic device.
8. The method for rapidly detecting the phase angle of the grid voltage according to claim 1, wherein S3 further comprises deviation rationality verification, wherein the predicted value of the phase angle deviation output by the photonic neural network is compared with a preset reasonable deviation threshold range, and if the predicted value exceeds the range, the predicted value is corrected to be a corresponding threshold boundary value.
9. The method for rapidly detecting the phase angle of the grid voltage according to claim 1, wherein S3 further comprises feedback optimization compensation, namely dynamically calculating a feedback adjustment coefficient according to the calibration error of the current phase angle, and dynamically adjusting a deviation compensation coefficient based on the fluctuation intensity of the working condition and the feedback adjustment coefficient, so as to calculate the accurate phase angle detection value.
10. The method for rapidly detecting a phase angle of a grid voltage according to claim 1, wherein the signal conditioning in S4 includes current-voltage conversion, low noise amplification and low pass filtering, and the communication protocol package supports ethernet/IP, modbus TCP or IEC 61850 standard and embeds a cyclic redundancy check code in a data frame.

Description

Rapid detection method for phase angle of power grid voltage Technical Field The invention relates to the technical field of power system measurement, in particular to a method for rapidly detecting a phase angle of a power grid voltage. Background In the fields of synchronous control of a power system, operation of a grid-connected inverter, power generation access of new energy sources and the like, it is important to accurately detect the phase angle of the voltage of a power grid in real time. The traditional detection method is mostly based on electronic sampling and digital signal processing technology, the sampling rate is limited by the bandwidth of an electronic analog-to-digital converter, high-frequency details in signals are difficult to capture, convergence delay exists, dynamic response speed is insufficient due to the fact that iterative algorithms such as phase-locked loops are generally relied on when phase angles are calculated, and besides, the traditional method is lack of an effective online self-adaptive calibration mechanism in contrast to complex dynamic working conditions such as rapid fluctuation of voltage amplitude and frequency offset caused by high-proportion renewable energy grid connection, so that detection accuracy is reduced, robustness is poor, and strict requirements of a modern power grid on rapid and accurate synchronous control are difficult to meet. Therefore, the invention provides a method for rapidly detecting the phase angle of the power grid voltage, which improves the technical problems. Disclosure of Invention Aiming at the defects of the prior art, the embodiment of the disclosure provides a rapid detection method for the phase angle of the power grid voltage, and the method adopts the technical paths of photon ultra-high-speed sampling, space-time coding, parallel photon operation and self-adaptive calibration of a photon neural network, thereby realizing real-time, high-precision and strong self-adaptive detection for the phase angle of the power grid voltage. The technical aim of the invention is realized by the following technical scheme that the method for rapidly detecting the phase angle of the power grid voltage comprises the following steps: S1, photon ultra-high-speed sampling and space-time ultra-resolution coding, namely ultra-high-speed sampling is carried out on a power grid voltage analog signal by adopting a photon analog-to-digital converter, a photon pulse stream is generated, space-time ultra-resolution coding is carried out on the photon pulse stream, and a 'time-space-polarization' three-dimensional photon feature matrix containing voltage time sequence, amplitude and phase information is constructed; s2, directly solving the phase angle by photon parallel operation, namely inputting the three-dimensional photon feature matrix into a photon linear operation array based on a silicon-based photon chip, parallelly solving the instantaneous phase angles of all sampling moments in a photon domain through photon interference, carrying out photon domain sliding average processing on the instantaneous phase angle sequence, and outputting an initial detection value of the phase angle; S3, photon self-adaptive calibration, namely based on a photon neural network integrated with a photon linear operation array on the same silicon-based photon chip, receiving the initial detection value of the phase angle and the dynamic working condition characteristic parameters acquired in real time, carrying out online reasoning and weight updating through a pre-trained phase deviation compensation model, calibrating the initial detection value of the phase angle, and outputting an accurate phase angle detection value; and S4, photon-electron compatible output, namely converting photon signals corresponding to the accurate phase angle detection values into electric signals through a photon detection array, and outputting the electric signals to a power grid control system after signal conditioning, analog-to-digital conversion and communication protocol encapsulation. As a preferred embodiment of the present invention, the space-time super-resolution encoding in S1 includes: s1.1, time dimension coding, namely mapping sampling time to a photon pulse time stamp; S1.2, space dimension coding, namely coupling voltage amplitude values and instantaneous phases of all sampling moments to photon polarization state parameters through coding coefficients; S1.3, constructing the three-dimensional photon feature matrix based on the time stamp and the polarization state parameter. As a preferable technical scheme of the invention, the photon linear operation array in S2 comprises P photon interference units which are arranged in parallel, wherein P is equal to the total number N of sampling points of the three-dimensional photon feature matrix; each photon interference unit comprises a photon beam splitter, a phase modulator, a photon coupler and a photon intensity detector,