CN-122001553-A - Power information cooperative modulation method based on reference signal multi-degree-of-freedom modulation

CN122001553ACN 122001553 ACN122001553 ACN 122001553ACN-122001553-A

Abstract

The invention belongs to the technical field of power information data collaborative modulation, and relates to a power information collaborative modulation method based on reference signal multi-degree of freedom modulation, which comprises the following steps of decomposing serial input information data of a transmitting end into three paths of parallel sub-data, respectively mapping the three paths of parallel sub-data into three independent modulation parameters of square wave signals, namely phase, frequency and amplitude, generating modulated square wave signals, wherein the different modulated square wave signals correspond to different phase, frequency and amplitude parameter combinations; the modulated square wave signal is superimposed to a reference signal to generate a gate level signal, the gate level signal controls the switching action to embed information data into output voltage ripple, the output voltage is subjected to signal conditioning at a receiving end to obtain a conditioned ripple signal containing the information data, and the conditioned ripple signal is demodulated by adopting a sliding discrete Fourier transform algorithm to obtain transmitted information data. The invention has high time synchronism and stronger system anti-interference performance.

Inventors

Gao Tianqu
Tan Minxia
YANG LI
HUANG TAO
LIU YITONG
ZHANG ZHUOQI
WU MENGFEI
DONG ZHENG

Assignees

山东大学
三峡新能源发电(寿光)有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (8)

1. The power information cooperative modulation method based on the reference signal multi-degree-of-freedom modulation is characterized by comprising the following steps of: The serial input information data of the transmitting end are decomposed into three paths of parallel sub-data, and the three paths of parallel sub-data are mapped into three independent modulation parameters of the square wave signal respectively, namely phase, frequency and amplitude, so that a modulated square wave signal is generated, and different modulated square wave signals correspond to different phase, frequency and amplitude parameter combinations; The modulated square wave signal is added to a reference signal to generate a bias square wave signal, the bias square wave signal is compared with a carrier wave to generate a gate level signal, the gate level signal controls the switching action, and information data is embedded into output voltage ripples; At a receiving end, performing signal conditioning on the output voltage to obtain a conditioned ripple signal containing information data; and demodulating the conditioned ripple signal by adopting a sliding discrete Fourier transform algorithm to obtain transmitted information data.
2. The collaborative modulation method for power information based on multi-degree of freedom modulation of reference signals according to claim 1 wherein the period of the square wave signal is an integer multiple of the period of the carrier wave and the multiple is greater than 2, the square wave signal is kept synchronous with the carrier wave.
3. The method for collaborative modulation of power information based on multi-degree of freedom modulation of a reference signal according to claim 1, wherein after the modulated square wave signal is superimposed with the reference signal, the duty ratio of the gate signal is positive disturbance period, negative disturbance period, phase shift left period and phase shift right period respectively, the duty ratio of the positive disturbance period is increased, the duty ratio of the negative disturbance period is decreased, the duty ratio of the phase shift left period and the phase shift right period is unchanged, and the phase of the gate signal is shifted left and right respectively.
4. The method for collaborative modulation of power information based on multiple degrees of freedom modulation of reference signals according to claim 3 wherein the output voltage ripple is in a downward trend during a positive disturbance period, the output voltage value at the end of a switching period is lower than a period starting value, the output voltage ripple is in an upward trend during a negative disturbance period, the output voltage value at the end of the switching period is higher than the period starting value, and the output voltage ripple value at the end of the switching period is restored to the period starting level during both a phase shift left period and a phase shift right period.
5. The method for collaborative modulation of power information based on multiple degrees of freedom modulation of a reference signal according to claim 1 wherein the step of signal conditioning includes: the method comprises the steps of isolating direct current components in output voltage by adopting a capacitor, reserving alternating current ripple waves, amplifying the alternating current ripple waves through a signal amplifier, sending the amplified alternating current ripple waves into a band-pass filter to filter irrelevant frequency components, and finally adding proper direct current level to amplified and filtered signals through a direct current bias circuit to obtain conditioned ripple wave signals which accord with an analog-to-digital conversion input range.
6. The collaborative modulation method for power information based on multi-degree of freedom modulation of reference signals according to claim 1, wherein the sliding discrete fourier transform algorithm adopts a recursive updating mode, and the recursive process is as follows: the number of points per sample is The current sampling sequence is Determine the th based on the following equation Subharmonic: , The next sampling sequence is Determine the th based on the following equation Subharmonic: , Wherein, the For the current fourier transform value, For the next fourier transform value, Is the first The value of the secondary sample is taken, Is the first The value of the secondary sample is taken, The number of points is the discrete time domain sampling; the number of the time domain discrete sampling points is the number of the time domain discrete sampling points; Is the harmonic order.
7. The method for collaborative modulation of power information based on multi-degree of freedom modulation of reference signals according to claim 1 wherein the method is applied to a DC-DC converter and employs a dual Boost converter architecture, wherein one Boost converter is used as a transmitting end for modulating transmitted information data, and the other Boost converter is used as a receiving end for demodulating received information data.
8. The method for collaborative modulation of power information based on multiple degrees of freedom modulation of a reference signal according to claim 1 wherein comparing a biased square wave signal with a carrier wave and generating a gate level signal comprises the steps of feeding the biased square wave signal into an inverting terminal of a comparator, feeding the carrier wave into a non-inverting terminal of the comparator, and generating a control gate level signal at an output terminal of the comparator.

Description

Power information cooperative modulation method based on reference signal multi-degree-of-freedom modulation Technical Field The invention belongs to the technical field of power information data cooperative modulation, and particularly relates to a power information cooperative modulation method based on reference signal multi-degree-of-freedom modulation. Background The PSDM coordinates the transmission of information data to power modulation by injecting the information data into a carrier or reference wave, the information data also being modulated into a pulse width modulated (Power Width Modulation, PWM) waveform. After the power demodulation of the converter filter, the information data is carried by the output voltage ripple, so that the original ripple of the converter carries and transmits the information data. For the existing PSDM scheme, the improvement of the communication bit rate is usually at the cost of increasing the complexity of the software and hardware of the modem, while the simple scheme of the modem is limited by the lower communication bit rate. The current common PSDM scheme is an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) scheme, firstly, serial data is converted into multiple parallel data, then the multiple data are modulated onto mutually orthogonal subcarrier phases, the modulated multiple subcarrier signals are added and combined into a composite signal, and finally, the composite signal is superimposed into a reference signal. The scheme uses only the degree of freedom of phase, and increases the communication bit rate through multiplexing parallel transmission. Although the OFDM scheme achieves improvement of communication rate, a modulation and demodulation process is complex. In the process of modulating information data, the requirement on the modulation synchronism of the information data on each subcarrier is high, and the core is to ensure that all subcarrier symbols are aligned in the time domain, so that an OFDM symbol block with clear boundaries is generated. If symbol timing deviation occurs between parallel modulation branches, the time domain alignment condition is destroyed, and interference is introduced into the added composite signal, and the correct demodulation of the information data is finally affected. In the demodulation process, coherent demodulation is required to be carried out on multiple paths of parallel subcarriers simultaneously, and differential phase demodulation of each subcarrier is obtained through calculation to obtain information data. The parallel processing algorithm is complex and computationally burdensome. Thus, the OFDM scheme brings higher system complexity while achieving higher communication rate. Disclosure of Invention In view of the above, the invention provides a power information cooperative modulation method based on reference signal multi-degree-of-freedom modulation, which solves the problems in the prior art. The technical scheme of the invention is as follows: The power information cooperative modulation method based on the reference signal multi-degree-of-freedom modulation comprises the following steps: The serial input information data of the transmitting end are decomposed into three paths of parallel sub-data, and the three paths of parallel sub-data are mapped into three independent modulation parameters of the square wave signal respectively, namely phase, frequency and amplitude, so that a modulated square wave signal is generated, and different modulated square wave signals correspond to different phase, frequency and amplitude parameter combinations; The modulated square wave signal is added to a reference signal to generate a bias square wave signal, the bias square wave signal is compared with a carrier wave to generate a gate level signal, the gate level signal controls the switching action, and information data is embedded into output voltage ripples; At a receiving end, performing signal conditioning on the output voltage to obtain a conditioned ripple signal containing information data; and demodulating the conditioned ripple signal by adopting a sliding discrete Fourier transform algorithm to obtain transmitted information data. Further, the period of the square wave signal is an integer multiple of the period of the carrier wave, the multiple is more than 2, and the square wave signal and the carrier wave are kept synchronous. Further, after the modulated square wave signal is overlapped with the reference signal, the duty ratio of the gate level signal is respectively a positive disturbance period, a negative disturbance period, a phase left shift period and a phase right shift period, the positive disturbance period corresponds to the increase of the duty ratio, the negative disturbance period corresponds to the decrease of the duty ratio, the phase left shift period and the phase right shift period correspond to the unchanged duty ratio, and the