A dynamic power reconfiguration adaptive sampling power quality monitoring system

Abstract

The application discloses a kind of dynamic power reconfiguration adaptive sampling power quality monitoring systems, including dynamic power management core, adaptive analog-digital conversion module, harmonic analysis accelerator, double-path interrupt processing module and data storage and communication module, dynamic power management core is divided into three power supply areas and calculates compensation coefficient;Adaptive analog-digital conversion module is used with coefficient to increase gain to offset interference;Harmonic analysis accelerator is handled to generate ultra-limit signal;Double-path interrupt processing module receives signal to trigger alarm;Data storage and communication module contain with protection storage area and the electrically erasable programmable read-only memory of associated fuse circuit.The application is combined by dynamic power management and adaptive analog-digital conversion, improves sampling anti-interference ability and precision;Harmonic analysis is handled and corrected by professional window, enhances the accuracy of abnormal harmonic identification;Data storage area with protection and fuse circuit, strengthen data security and tamper resistance ability, overall optimization power quality monitoring reliability and stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power system monitoring, and relates to a dynamic power reconstruction adaptive sampling power quality monitoring system. BACKGROUND

[0002] With the power quality directly affecting the safe and stable operation of power equipment and the power experience of power users in the process of power system operation, harmonic distortion is one of the main factors leading to the decline of power quality. Real-time and accurate monitoring of the amplitude and other parameters of the fundamental wave and each harmonic is of great significance for timely discovery of power system abnormalities and taking targeted control measures.

[0003] The existing power quality monitoring system has the problem of being difficult to balance in terms of sampling accuracy and power consumption control. On the one hand, in order to improve the sampling accuracy, the oversampling rate is usually set to a fixed high level, which leads to an increase in system power consumption and is not conducive to long-term stable operation. On the other hand, power supply ripple will interfere with the sampling signal, and the existing system lacks an effective dynamic compensation mechanism, making it difficult to ensure the sampling accuracy under different working conditions.

[0004] At the same time, the power management mode of the traditional system is relatively fixed, and each functional module is often in a continuous power supply state, which cannot dynamically adjust the on-off of the power supply domain according to the operation task, resulting in energy waste. In addition, in terms of real-time performance and data security of harmonic analysis, the interrupt response speed of the existing system is slow, and the key distortion waveform data is easy to be tampered with, affecting the reliability of the monitoring result and the effectiveness of the subsequent analysis.

[0005] Therefore, there is an urgent need for a power quality monitoring system that can realize dynamic power management, adaptive sampling adjustment, fast harmonic analysis and secure data storage to solve the problems of insufficient sampling accuracy, high power consumption, slow response and poor data security in the prior art. SUMMARY

[0006] To solve the problems in the background art, the application provides a dynamic power reconstruction adaptive sampling power quality monitoring system, which aims to solve the problems of insufficient sampling accuracy, high power consumption, slow response and poor data security in the prior art.

[0007] The first aspect of the application provides a dynamic power reconstruction adaptive sampling power quality monitoring system, which comprises a dynamic power management core, an adaptive analog-to-digital conversion module, a harmonic analysis accelerator, a double-path interrupt processing module and a data storage and communication module.

[0008] The dynamic power management core divides the system into three independent power supply domains, namely a micro control unit core, an analog-to-digital conversion domain and a communication domain, so as to control the power supply of each independent power supply domain, and calculates a compensation coefficient according to the voltage change.

[0009] The adaptive analog-to-digital conversion module comprises a programmed gain amplifier, and the compensation coefficient generated by the dynamic power management core is transmitted to the programmed gain amplifier, so as to dynamically adjust the gain level, offset the interference of the power supply ripple on the sampling, and generate a sampling sequence.

[0010] The harmonic analysis accelerator performs a Blackman-Harris window processing on the received sampling sequence to generate a target sequence, pre-processes the target sequence, and calculates the abnormal harmonic amplitude through an amplitude correction formula to generate a harmonic amplitude overrun signal.

[0011] The dual-path interrupt processing module comprises an unmaskable interrupt channel, which receives the harmonic amplitude overrun signal and triggers an electric energy quality abnormality alarm of the system.

[0012] The data storage and communication module comprises an electrically erasable programmable read-only memory, which contains a protected storage area and is associated with a physical fuse circuit.

[0013] Optionally, the dynamic power management core is configured with a voltage tracking circuit, and the voltage tracking circuit further comprises a compensation coefficient generator, which calculates a compensation coefficient according to a formula , wherein, is the compensation coefficient, ΔV is the difference between the input voltage and the reference voltage, and α is a function of the load current of the low-dropout regulator.

[0014] Optionally, the adaptive analog-to-digital conversion module further comprises an oversampling rate dynamic adjuster, which automatically configures the oversampling rate according to a formula OSR = [fs / (2.5 × fin)] , wherein, is the sampling frequency of 125 kilosamples per second, is the input signal frequency, and OSR is the oversampling rate.

[0015] Optionally, the adjustment rule of the oversampling rate dynamic adjuster is: when the input signal frequency ≤ 50 Hz, the oversampling rate = 64; when 50 Hz < input signal frequency ≤ 1000 Hz, the oversampling rate = 32; when the input signal frequency > 1000 Hz, the oversampling rate OSR = 8 and an 8th-order anti-aliasing digital filter is started.

[0016] Optionally, the calculation of the abnormal harmonic amplitude formula is {A}_{k}=\frac {2\left | {x\left [ {k} \right ]} \right |} {N{\Sigma}^{N-1}_{n=0}w\left [ {n} \right ]} , wherein, is the kth harmonic amplitude, X\left [ {} \right ]\left [ {k} \right ] is the Fourier transform output value, N is the number of sampling points, \omega \left [ {n} \right ] is the window function sequence.

[0017] Optionally, the double-path interrupt processing module further comprises the maskable interrupt channel, which receives an external trigger signal and accesses the interrupt controller through a programmable frequency divider.

[0018] Optionally, the data storage and communication module further comprises a communication domain, which contains a protocol conversion and level adaptation circuit.

[0019] Optionally, when the communication domain is activated, the dynamic power management core adjusts the supply voltage to a protocol specified range.

[0020] Optionally, in the initial state of the system, the dynamic power management core only maintains the power supply of the micro control unit core, and the analog-to-digital conversion domain and the communication domain are in a power-off state.

[0021] Optionally, after the sampling is completed, the dynamic power management core immediately turns off the power supply of the analog-to-digital conversion domain; when the Fourier transform needs to be performed, only the power supply of the micro control unit core and the harmonic analysis accelerator is maintained.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The present application provides a dynamic power reconstruction adaptive sampling power quality monitoring system, comprising: a dynamic power management core, an adaptive analog-to-digital conversion module, a harmonic analysis accelerator, a double-path interrupt processing module, and a data storage and communication module; the dynamic power management core is divided into three power supply domains and calculates compensation coefficients; the adaptive analog-to-digital conversion module adjusts the gain with the coefficients to offset interference; the harmonic analysis accelerator generates an out-of-limit signal after processing; the double-path interrupt processing module receives a signal to trigger an alarm; and the data storage and communication module contains an electrically erasable programmable read-only memory with a protected storage area and an associated fuse circuit.

[0024] The application combines dynamic power management with adaptive analog-digital conversion to improve sampling anti-interference ability and precision; harmonic analysis is processed and corrected by a professional window to enhance the accuracy of abnormal harmonic identification; double-path interruption ensures timely triggering of abnormal alarms and improves real-time response speed; data storage zone protection and fuse circuit strengthen data security and anti-tampering ability, and overall optimize the reliability and stability of power quality monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of a dynamic power reconstruction adaptive sampling power quality monitoring system in an embodiment of the application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0027] In an embodiment, as shown in Figure 1 , a dynamic power reconstruction adaptive sampling power quality monitoring system is provided, which comprises a dynamic power management core, an adaptive analog-digital conversion module, a harmonic analysis accelerator, a double-path interruption processing module, and a data storage and communication module, and the functions of each module are described as follows:

[0028] The dynamic power management core divides the system into three independent power supply domains, namely a micro control unit core, an analog-digital conversion domain, and a communication domain, so that the system controls the power supply of each independent power supply domain, and calculates a compensation coefficient according to voltage changes. The dynamic power management core only maintains the power supply of the micro control unit core in the initial state of the system, and the analog-digital conversion domain and the communication domain are in a power-off state. The dynamic power management core immediately turns off the power supply of the analog-digital conversion domain after sampling is completed; and only maintains the power supply of the micro control unit core and the harmonic analysis accelerator when performing Fourier transform.

[0029] The dynamic power management core is configured with a voltage tracking circuit, which further comprises a compensation coefficient generator, which calculates a compensation coefficient according to the formula , wherein, is the compensation coefficient, ΔV is the difference between the input voltage and the reference voltage, and α is a function of the load current of the low dropout regulator. The dynamic power management core further comprises a load prediction circuit, which can turn on the power supply of the target domain in advance according to the operation task, and can restore the power supply of the corresponding domain in the interruption response with the help of a priority arbiter, so as to ensure that the system can quickly start the relevant modules when needed, and balance the response speed and energy consumption control.

[0030] The adaptive analog-to-digital conversion module comprises a programmed gain amplifier, and the compensation coefficient generated by the dynamic power management core is transmitted to the programmed gain amplifier, so as to dynamically adjust the gain level, offset the interference of the power ripple on the sampling, and generate a sampling sequence. The adaptive analog-to-digital conversion module further comprises an oversampling rate dynamic adjuster, which automatically configures the oversampling rate according to the formula OSR = [fs / (2.5 * fin)] wherein, the sampling frequency is 125 kilosamples per second, the input signal frequency is fin, and the oversampling rate is OSR.

[0031] The adaptive analog-to-digital conversion module further comprises an oversampling rate dynamic adjuster, and the adjustment rule of the oversampling rate dynamic adjuster is as follows: when the input signal frequency is less than or equal to 50 Hz, the oversampling rate is 64; when the input signal frequency is greater than 50 Hz and less than or equal to 1000 Hz, the oversampling rate is 32; and when the input signal frequency is greater than 1000 Hz, the oversampling rate is OSR = 8 and an 8th-order anti-aliasing digital filter is started.

[0032] The adaptive analog-to-digital conversion module further comprises a synchronous timing controller, which can adjust the sampling clock phase to make the sampling time coincide with the power ripple valley value. Sampling at the power ripple valley value can minimize the influence of the ripple on the sampled signal, further improve the sampling accuracy, and provide high-quality sampling data for subsequent harmonic analysis.

[0033] The adaptive analog-to-digital conversion module cooperatively realizes high-precision sampling and conversion of the analog signal of electric energy through the above-mentioned functions of dynamic oversampling rate adjustment, dynamic gain adjustment, and synchronous timing control, thereby laying a solid foundation for stable operation and accurate analysis of the entire power quality monitoring system.

[0034] The harmonic analysis accelerator performs the Blackman-Harris window processing on the received sampling sequence to generate a target sequence, pre-processes the target sequence, calculates the harmonic amplitude through an amplitude correction formula, and generates a harmonic amplitude out-of-limit signal if there is an abnormality. The formula for calculating the abnormal harmonic amplitude is {Ak} = 2 |x[k]| / N∑N-1n=0w[n] wherein, Ak is the kth harmonic amplitude, and X[k] is the target sequence. is the Fourier transform output value, N is the number of sampling points, and is a window function sequence.

[0035] In the present application, the harmonic analysis accelerator is used for fast processing of sampling data, accurate calculation of harmonic amplitude in power signals, and judgment of power quality. The harmonic analysis accelerator opens a special buffer area in the micro control unit memory and specially processes the sampling sequence transmitted from the analog-to-digital conversion module.

[0036] In the present application, the harmonic analysis accelerator first performs the Blackman-Harris window on the sampling sequence to obtain a target sequence. The windowing operation can reduce spectral leakage and make subsequent analysis more accurate. Then, the base-4 butterfly algorithm is performed on the target sequence to complete 128-point fast Fourier transform. This algorithm can quickly convert the time-domain sampling signal to the frequency domain, greatly improving the operation efficiency. Finally, the amplitude correction formula is used to calculate the fundamental and 2-15th harmonic amplitudes.

[0037] In the power quality monitoring system, the harmonic analysis accelerator accurately calculates the harmonic amplitude, which can help the staff to timely find the harmonic problem in the power system. For example, if the 3rd harmonic content exceeds the threshold, the harmonic analysis accelerator will trigger an unmaskable interrupt, and the system can quickly respond, such as activating an alarm to notify the staff, avoiding damage to power equipment caused by harmonics, and ensuring stable operation of the power system.

[0038] The double-path interrupt processing module includes an unmaskable interrupt channel that receives a harmonic amplitude over-limit signal and triggers an abnormal power quality alarm of the system. The double-path interrupt processing module also includes the maskable interrupt channel, which receives an external trigger signal, and after processing by the programmable frequency divider, the signal is connected to the interrupt controller. The external trigger can be flexibly responded according to the system requirements, and the corresponding power supply domain is restored by the load prediction circuit in cooperation with the priority arbiter during the response process, ensuring the timeliness of interrupt processing.

[0039] Through the double-path design, the double-path interrupt processing module can quickly respond to the harmonic over-limit situation that endangers the operation of the system, and can also flexibly process external trigger signals, taking into account the system's rapid handling ability for emergency events and adaptability to external interactions. It is an important support for the system to realize real-time monitoring and dynamic response.

[0040] The data storage and communication module includes an electrically erasable programmable read-only memory containing a protected storage area and associated physical fuse circuit to prohibit tampering of data and ensure security and non-tamperability of critical monitoring data. The data storage and communication module also includes a communication domain containing protocol conversion and level adaptation circuit. When the communication domain is activated, the supply voltage is adjusted to a protocol specified range by a dynamic power management core. That is, the communication domain power supply is controlled by the dynamic power management core. When the harmonic data meets the upload condition, the dynamic power management core activates the communication domain and adjusts the supply voltage to the protocol specified range, so that the communication domain can adapt to the corresponding protocol to complete data transmission; after data transmission is completed, the communication domain power supply is turned off and the system returns to a low power consumption state, realizing efficient energy consumption control of the communication process.

[0041] The data storage and communication module cooperates with secure storage and adaptive communication to ensure the reliability and transmissibility of monitoring data, which is an important link for the system to realize data closed-loop management.

[0042] In this embodiment, the entire process of signal interaction of the application is discussed in detail. The application is developed in four stages of dynamic power reconstruction, adaptive sampling, real-time analysis, secure storage and communication, and each module cooperates through orderly signal transmission. The specific process is as follows:

[0043] In the dynamic power reconstruction stage, only the microcontroller core is powered on in the initial state of the system, and the analog-digital conversion domain and the communication domain are powered off. When an external sampling instruction is received, the instruction signal triggers the dynamic power management core to activate the analog-digital conversion domain power supply, and at the same time, the load prediction circuit prepares the power supply path signal in advance according to the operation task to prepare for subsequent sampling.

[0044] After entering the adaptive sampling stage, the voltage tracking circuit collects the difference between the input voltage and the reference voltage through a differential amplifier, and the signal of the difference between the input voltage and the reference voltage is transmitted to the compensation coefficient generator to calculate the compensation coefficient. The signal of the compensation coefficient is then sent to the programming gain amplifier in the adaptive analog-digital conversion module to dynamically adjust the gain position to offset the power supply ripple. At the same time, the over-sampling rate dynamic regulator detects the input signal frequency, generates a corresponding over-sampling rate configuration signal according to the input signal frequency, and the synchronous timing controller adjusts the sampling clock phase after receiving the signal to make the sampling time coincide with the power supply ripple valley value. Finally, the analog-digital conversion module outputs the processed sampling sequence signal to the harmonic analysis accelerator.

[0045] In the real-time harmonic analysis and interruption response stage, after receiving the sampling sequence signal, the harmonic analysis accelerator performs windowing processing and fast Fourier transform to calculate the fundamental and 2-15th harmonic amplitude signals. If the 3rd harmonic amplitude exceeds the limit, the harmonic amplitude exceeding signal will be sent to the non-maskable interrupt channel of the dual-path interruption processing module, triggering the interruption response and activating the general input-output alarm signal. In addition, after receiving the external trigger signal through the maskable interrupt channel, the interruption control signal is formed by the programmable frequency divider processing and accessed to the interruption controller, and then the power recovery signal is generated through the priority arbiter to realize the recovery of the corresponding domain power supply.

[0046] In the data storage and communication stage, the distorted waveform data signal obtained by harmonic analysis is written into the protected storage area of the electrically erasable programmable read-only memory, triggering the physical fuse blowing signal to lock the data. When the harmonic data meets the upload condition, the trigger signal activates the communication domain of the dynamic power management core, and generates the voltage regulation signal to regulate the communication domain power supply voltage to the protocol specified range. After sending the data transmission signal, the communication domain closes the power supply signal, and the system returns to the low-power state.

[0047] The above-mentioned dynamic power reconstruction adaptive sampling power quality monitoring system can be realized by software, hardware and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or stored in the memory of the computer device in software form, so as to call and execute the operations of the above-mentioned modules by the processor.

[0048] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A dynamic power reconfiguration adaptive sampling power quality monitoring system, characterized in that, The dynamic power management core, the adaptive analog-digital conversion module, the harmonic analysis accelerator, the double-path interrupt processing module and the data storage and communication module are included. The dynamic power management core divides the system into three independent power supply domains, i.e., a micro control unit core, an analog-digital conversion domain and a communication domain, to control the power supply of each independent power supply domain, and calculates a compensation coefficient according to voltage variation. The adaptive analog-digital conversion module includes a programmed gain amplifier, and the compensation coefficient is transmitted to the programmed gain amplifier to dynamically adjust a gain gear and generate a sampling sequence. The harmonic analysis accelerator performs a Blackman-Harris window processing on the received sampling sequence to generate a target sequence, pre-processes the target sequence, calculates an abnormal harmonic amplitude through an amplitude correction formula, and generates a harmonic amplitude overrun signal. The double-path interrupt processing module is used for receiving the harmonic amplitude overrun signal and triggering an electric energy quality abnormality alarm of the system. The data storage and communication module is used for protecting a storage area and associating a physical fuse circuit. The amplitude correction formula is wherein, is the kth harmonic amplitude, is the Fourier transform output value, and N is the number of sampling points, is a window function sequence.

2. The dynamic power reconfiguration adaptive sampling power quality monitoring system of claim 1, wherein, The dynamic power management core is configured with a voltage tracking circuit, and the voltage tracking circuit further includes a compensation coefficient generator, which is configured to generate a compensation coefficient according to a formula The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein The compensation coefficient is calculated, wherein < 3. The dynamic power reconfiguration adaptive sampling power quality monitoring system of claim 1, wherein, The adaptive analog-to-digital conversion module further comprises an over-sampling rate dynamic adjuster which automatically configures the over-sampling rate according to the formula wherein, is the sampling frequency, is the input signal frequency, and OSR is the over-sampling rate. is the sampling frequency, is the input signal frequency, and OSR is the over-sampling rate.

4. The dynamic power reconfiguration adaptive sampling power quality monitoring system of claim 1, wherein, The adaptive analog-digital conversion module further includes an oversampling rate dynamic adjuster, and the adjustment rule of the oversampling rate dynamic adjuster is that when an input signal frequency is less than or equal to 50 Hz, an oversampling rate is 64; when 50 Hz is less than the input signal frequency and the input signal frequency is less than or equal to 1000 Hz, the oversampling rate is 32; and when the input signal frequency is greater than 1000 Hz, the oversampling rate OSR is 8 and an 8-order anti-aliasing digital filter is started.

5. The dynamic power reconfiguration adaptive sampling power quality monitoring system of claim 1, wherein, The double-path interrupt processing module further includes a maskable interrupt channel, and the maskable interrupt channel receives an external trigger signal and accesses an interrupt controller through a programmable frequency divider.

6. The dynamic power reconfiguration adaptive sampling power quality monitoring system of claim 1, wherein, The data storage and communication module further includes a communication domain, and the communication domain includes a protocol conversion and level adaptation circuit.

7. The dynamic power reconfiguration adaptive sampling power quality monitoring system of claim 1, wherein, When the communication domain is activated, the dynamic power management core adjusts the supply voltage to a protocol specified range.

8. The dynamic power reconfiguration adaptive sampling power quality monitoring system of claim 1, wherein, In an initial state of the system, the dynamic power management core only maintains the power supply of the micro control unit core, and the analog-digital conversion domain and the communication domain are in a power-off state.

9. The dynamic power reconfiguration adaptive sampling power quality monitoring system of claim 1, wherein, After the sampling is completed, the dynamic power management core immediately closes the power supply of the analog-digital conversion domain, and only maintains the power supply of the micro control unit core and the harmonic analysis accelerator when the Fourier transform is performed.

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