Electric energy data detection device

Abstract

The utility model relates to an electric energy data detection device, and relates to the technical field of electric energy data detection. According to the electric energy data detection device, an A / D conversion module is used for converting a received alternating voltage signal and a received alternating current signal into a voltage digital signal and a current digital signal respectively, and the A / D conversion module is connected with a central processing unit and further used for sending the voltage digital signal and the current digital signal to the central processing unit; the central processor is used for calculating a voltage frequency value based on the received AC voltage signal, and calculating a voltage effective value and a current effective value based on the received voltage digital signal and the current digital signal respectively. According to the electric energy data detection device, the device structure is simplified, the device cost is reduced, the detection rate and the detection precision are improved, and the application scene of the electric energy data detection device is expanded.

Description

Technical Field

[0001] This application relates to the technical field of power data detection, and particularly to a power data detection device. Background Art

[0002] A power data detection device (also known as a power quality monitoring device or a power metering device) is a device used to monitor and measure the electrical energy characteristics in a power system. These devices can collect and analyze a series of electrical parameters to ensure the quality and reliability of the power supply. For example, when the power data detection device provides the power data indicating the grid quality status information detected to an energy storage system, the energy storage system can quickly adjust its power output according to the detected power data to help stabilize the grid.

[0003] The typical architecture of a power data detection device in the related art is: the architecture of CPU (Central Processing Unit) + FPGA (Field-Programmable Gate Array) + DSP (Digital Signal Processor). After converting the power data waveform into a digital signal through the FPGA in the power data detection device based on this architecture, it is sent to the DSP for calculating various power data, and then saved by the CPU or sent to other devices for use. Among them, the combination of FPGA and DSP can achieve high-speed data acquisition and real-time calculation, improve the timeliness and accuracy of the detected data, and can also achieve the advantages of simultaneously monitoring and analyzing multiple power parameters.

[0004] However, since the power data detection device with the above architecture includes multiple high-performance chips, the design and debugging are relatively complex, the device cost is relatively high, and when there is a large amount of data processed simultaneously, the response time required for detection is relatively long. In addition, the errors introduced by complex algorithms and signal processing also affect the accuracy of the detection results. Summary of the Utility Model

[0005] The power data detection device provided by the embodiments of the present utility model solves at least the problems of complex device structure, high device cost, and relatively low detection rate and detection accuracy existing in the power data detection device in the related art.

[0006] To solve the above problems, one aspect of the embodiments of the present utility model provides a power data detection device, including: an A / D conversion module and a central processor; wherein,

[0007] The A / D conversion module is used to convert the received AC voltage signal and AC current signal into a voltage digital signal and a current digital signal respectively. The A / D conversion module is connected to the central processor and is also used to send the voltage digital signal and the current digital signal to the central processor;

[0008] The central processor is used to calculate the voltage frequency value based on the received AC voltage signal, and calculate the voltage effective value and the current effective value based on the received voltage digital signal and current digital signal respectively.

[0009] In some embodiments, the device further includes a waveform conversion module, wherein,

[0010] The waveform conversion module is used to convert the received AC voltage signal into a voltage square wave signal. The waveform conversion module is connected to the central processor and is also used to send the voltage square wave signal to the central processor so that the central processor calculates the voltage frequency value based on the voltage square wave signal.

[0011] In some embodiments, the device further includes an electric energy data acquisition module, and the electric energy data acquisition module includes a voltage sampling circuit and a current sampling circuit; wherein,

[0012] One end of the voltage sampling circuit is connected to the circuit to be detected and is used to collect the AC voltage signal in the circuit to be detected; the other end of the voltage sampling circuit is respectively connected to the waveform conversion module and the A / D conversion module and is used to send the collected AC voltage signal to the waveform conversion module and the A / D conversion module respectively;

[0013] One end of the current sampling circuit is connected to the circuit to be detected and is used to collect the AC current signal in the circuit to be detected; the other end of the current sampling circuit is connected to the A / D conversion module and is used to send the collected AC current signal to the A / D conversion module.

[0014] In some embodiments, the other end of the current sampling circuit is further connected to the waveform conversion module and is used to send the collected AC current signal to the waveform conversion module.

[0015] In some embodiments, the electric energy data acquisition module is connected to the grid-connected side of the energy storage system and is used to collect the electric energy data of the grid-connected side of the energy storage system.

[0016] In some embodiments, the central processor includes a timer and a digital signal processor; wherein,

[0017] The timer is used to calculate the voltage frequency value based on the AC voltage signal;

[0018] The digital signal processor is used to calculate the voltage effective value and the current effective value based on the voltage digital signal and the current digital signal respectively.

[0019] In some of these embodiments, the central processing unit further includes a storage module, which is used to store the voltage signal frequency value calculated by the timer, as well as the effective voltage value and the effective current value calculated by the digital signal processor.

[0020] In some of these embodiments, the central processing unit further includes at least one communication interface, and the central processing unit is further configured to send the voltage frequency value, the effective voltage value, and the effective current value to an external device via the communication interface.

[0021] In some of these embodiments, the A / D conversion module is a multi-channel A / D conversion chip.

[0022] In some of these embodiments, the AC voltage signal is a single-channel AC voltage signal or multiple-channel AC voltage signals.

[0023] Advantages of the embodiments of the present utility model: By adopting an electric energy data detection device including an A / D conversion module and a central processing unit; wherein, the A / D conversion module is configured to convert the received AC voltage signal and AC current signal into a voltage digital signal and a current digital signal respectively, the A / D conversion module is connected to the central processing unit, and is further configured to send the voltage digital signal and the current digital signal to the central processing unit; the central processing unit is configured to calculate a voltage frequency value based on the received AC voltage signal, and calculate an effective voltage value and an effective current value respectively based on the received voltage digital signal and current digital signal, which overcomes the problems in the electric energy data detection device in the related art that due to the inclusion of multiple high-performance chips, the design and debugging are relatively complex, the device cost is relatively high, and when there is a large amount of data to be processed simultaneously, the response time required for detection is relatively long. In addition, the errors introduced by complex algorithms and signal processing also affect the accuracy of the detection results. It realizes that the electric energy data detection can be completed only through the A / D conversion module and the central processing unit, simplifies the device structure, reduces the device cost, and the signal processing and frequency calculation logic are simple, achieving the technical effects of improving the detection rate and detection accuracy, and expanding the application scenarios of the electric energy data detection device.

[0024] Details of one or more embodiments of the present utility model are set forth in the following drawings and description, so that other features, objects, and advantages of the present utility model will become more clearly understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and for those of ordinary skill in the art, other embodiments can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic diagram of the frame structure of the electric energy data detection device according to an embodiment of the present utility model.

[0027] Figure 2 It is a schematic diagram of the detection process of the electric energy data detection device according to another embodiment of the present utility model. Detailed implementation manners

[0028] Embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are only for exemplary purposes and are not used to limit the protection scope of the present utility model.

[0029] Energy storage systems play multiple roles in modern power systems. In addition to traditional peak-valley arbitrage (charging during low electricity price periods and discharging during peak periods to save electricity costs) and peak shaving and valley filling (smoothing the load curve and reducing peak demand), "demand response" is also a crucial function. When the grid frequency or grid voltage fluctuates, the energy storage system can automatically adjust the active and reactive power outputs of the PCS (Power Conversion System) for compensation. Demand response enables the energy storage system to respond more flexibly to the grid's demands, thereby improving the efficiency and reliability of the entire power system. To achieve this goal, the energy storage system needs to obtain real-time grid frequency and voltage fluctuation data, and the electric energy data detection device can provide the energy storage system with electric energy data containing grid quality status information.

[0030] The typical architecture of the electric energy data detection device is: the architecture of CPU + FPGA + DSP. Based on this architecture, the electric energy data detection device converts the electric energy data waveform into a digital signal through the FPGA and then sends it to the DSP for calculation to obtain various electric energy data, which are then saved by the CPU or sent to other devices for use. Among them, the combination of FPGA and DSP can achieve high-speed data acquisition and real-time calculation, improving the timeliness and accuracy of the detected data, and can also achieve the advantages of simultaneously monitoring and analyzing multiple electric energy parameters.

[0031] However, since the electric energy data detection device with the above architecture contains multiple high-performance chips, the design and debugging are relatively complex, the device cost is relatively high, and when dealing with a large amount of data simultaneously, the response time required for detection is relatively long. In addition, the errors introduced by complex algorithms and signal processing also affect the accuracy of the detection results.

[0032] To solve the above problems, an embodiment of the present utility model provides an electric energy data detection device, as Figure 1 shown. The electric energy data detection device mainly includes: an A / D conversion module and a central processor. Among them, the A / D conversion module is used to convert the received AC voltage signal and AC current signal into a voltage digital signal and a current digital signal respectively. The A / D conversion module is connected to the central processor and is also used to send the voltage digital signal and the current digital signal to the central processor. The central processor is used to calculate the voltage frequency value based on the received AC voltage signal, and calculate the voltage effective value and the current effective value based on the received voltage digital signal and current digital signal respectively.

[0033] Among them, the A / D conversion module provided by the embodiment of the present utility model refers to an Analog-to-Digital Converter, that is, an analog-to-digital conversion module, which is used to convert a continuously changing analog signal into a discrete digital signal. Since directly processing analog signals is often inefficient and vulnerable to interference, based on the above A / D conversion module, converting analog signals (AC voltage signal and AC current signal) into digital signals to achieve signal digitization helps to directly process the digital signals subsequently (by performing operations of squaring, averaging, and then taking the square root on the received voltage and current digital signals by the CPU, the effective values of them can be calculated), thereby obtaining the voltage effective value and the current effective value quickly and efficiently, and accordingly improving the detection rate and detection accuracy.

[0034] At the same time, since the CPU also has the ability to process data, the calculation operation of the voltage frequency value can be directly performed based on the AC voltage signal by the CPU. For example, detecting the zero-crossing point of the waveform of the AC voltage signal by the CPU; specifically, by comparing the signs (positive or negative) of adjacent sampling points in the waveform of the AC voltage signal, when the sign changes, it is considered that a zero-crossing point has occurred. By recording the time difference between consecutive zero-crossing points, the period can be calculated, and then the frequency of the AC voltage can be obtained. At the same time, the CPU can also use the FFT algorithm to convert the signal in the time domain to the frequency domain, and find the dominant frequency component from it, that is, the fundamental frequency of the AC voltage. According to the embodiment of the present utility model, since the autocorrelation function can be used to estimate the periodicity of the signal, the CPU can also calculate the voltage frequency value based on the autocorrelation function method. Specifically, by calculating the correlation between the signal and its own delayed version, the maximum autocorrelation point of the signal can be found, and the delay corresponding to this point is the period of the signal. This method also has good robustness for signals containing noise. It can be understood that based on the data processing ability of the CPU, other existing methods can also be used to directly calculate the voltage frequency value based on the AC voltage signal.

[0035] Compared with traditional power data detection devices (such as the aforementioned CPU+FPGA+DSP architecture), the utility model realizes effective detection of power data through streamlined components (A / D conversion module and central processor CPU). Specifically, this device only uses an A / D conversion module and a CPU, reducing the number of components, simplifying the internal structure, and lowering the complexity of design and maintenance. The A / D conversion module directly converts analog signals into digital signals, eliminating intermediate links and improving the speed of signal processing. At the same time, the efficient algorithm of the CPU can quickly and accurately calculate the required power parameters, such as frequency, effective voltage value, and effective current value, thereby improving the detection rate and accuracy. Further, the simplified design and lower cost make this device easier to be widely applied in various occasions. Whether it is an industrial environment or household power monitoring, it can effectively conduct real-time detection and analysis of power data.

[0036] In some specific embodiments, when the requirements for detection accuracy and detection rate are relatively high, a multi-channel high-precision A / D conversion chip can be used (multi-channel A / D conversion can process multiple input signals simultaneously and provide high-precision digital output). When the requirements for cost control are relatively high, a lower-cost external A / D converter can be used, and it is controlled and data is read through the GPIO (General Purpose Input Output) of the CPU, thereby realizing power data detection.

[0037] In some embodiments, the device further includes a waveform conversion module. Among them, the waveform conversion module is used to convert the received AC voltage signal into a voltage square wave signal. The waveform conversion module is connected to the central processor and is also used to send the voltage square wave signal to the central processor so that the central processor calculates the voltage frequency value based on the voltage square wave signal.

[0038] Since the edges of the square wave signal are clear, the rising edge and falling edge of the square wave signal are usually steeper and more consistent than the original AC signal, which enables the CPU to more accurately detect the signal transition point and helps improve the accuracy of frequency measurement.

[0039] By adding a waveform conversion module to the power data detection device, the preprocessing of AC voltage signals is realized, enabling the CPU to only need to process simple square wave signals instead of the original analog signals or complex digital signals. This greatly reduces the computational burden on the CPU and improves the response speed and efficiency of the overall system. By converting the AC signal into a square wave signal, the CPU can directly calculate the voltage frequency by counting the period or frequency of the square wave, without the need for complex signal processing algorithms. At the same time, the waveform conversion module can filter out some noise because the conversion is only triggered when the signal exceeds a preset threshold. Thus, even if there are some small-amplitude noises, they will not affect the formation of the square wave signal, thereby improving the anti-interference ability of the system. Further, compared with using more complex data processing algorithms or higher-performance CPUs to directly process analog signals, using the waveform conversion module allows for the use of a CPU with lower performance but lower cost, thus controlling the cost while ensuring the measurement accuracy. Moreover, the hardware implementation of the waveform conversion module is relatively simple, easy to integrate into the existing system, and also convenient for later maintenance and upgrade.

[0040] In some of the embodiments, the device further includes a power data acquisition module, and the power data acquisition module includes a voltage sampling circuit and a current sampling circuit; wherein, one end of the voltage sampling circuit is connected to the circuit to be detected, for acquiring the AC voltage signal in the circuit to be detected; the other end of the voltage sampling circuit is respectively connected to the waveform conversion module and the A / D conversion module, for sending the acquired AC voltage signal to the waveform conversion module and the A / D conversion module respectively; one end of the current sampling circuit is connected to the circuit to be detected, for acquiring the AC current signal in the circuit to be detected; the other end of the current sampling circuit is connected to the A / D conversion module, for sending the acquired AC current signal to the A / D conversion module.

[0041] As Figure 2 shown, the power data acquisition module may include a voltage sampling circuit and a current sampling circuit. Based on the power data acquisition module including the voltage sampling circuit and the current sampling circuit to capture the real AC voltage signal and AC current signal from the circuit to be detected, the accuracy and reliability of data acquisition are ensured. And by independently designing the voltage and current sampling circuits, the system has better modularity and scalability. If a certain part needs to be replaced or upgraded, only the corresponding circuit module needs to be replaced without affecting the entire system, reducing the difficulty of maintenance and upgrade.

[0042] According to a specific embodiment of the present utility model, based on the sampling circuit, the AC voltage signal and the AC current signal can be preprocessed before signal transmission, such as filtering, amplifying or attenuating, to optimize the signal quality and ensure that the signals received by the subsequent A / D conversion and waveform conversion modules are cleaner and more stable. According to another specific embodiment, a signal isolation component, such as an optocoupler or a transformer, can also be added to the sampling circuit, which can not only prevent high voltage or large current from directly entering the sensitive detection circuit, but also avoid the influence of the detection circuit on the main circuit, improving the safety of the entire system.

[0043] In some of these embodiments, the other end of the current sampling circuit is also connected to the waveform conversion module, and is used to send the collected AC current signal to the waveform conversion module.

[0044] Since the protection and control systems in the power system mainly judge whether a fault or abnormality occurs based on the voltage frequency and voltage amplitude, and all devices in the power system, including generators, transformers, loads, etc., operate synchronously based on the grid frequency. The change of the voltage frequency will affect the synchronization and stability of the entire system. Under stable grid conditions, the current frequency is usually the same as the voltage frequency. Therefore, only the voltage frequency value is determined according to the AC voltage signal in the foregoing steps.

[0045] However, in some specific cases, such as when the grid is severely unbalanced or the non-linear load causes significant differences in the current and voltage waveforms, relying solely on the voltage frequency may not be sufficient to comprehensively evaluate the power quality. In this case, the frequency and phase analysis of the current signal can help diagnose power quality problems, such as harmonic distortion, power factor reduction or three-phase imbalance. Therefore, the AC current signal collected by the current sampling circuit can also be sent to the waveform conversion module to obtain a current square wave signal, and then the CPU can calculate the current frequency value separately.

[0046] In some of these embodiments, the power data acquisition module is connected to the grid-connected side of the energy storage system and is used to collect the power data of the grid-connected side of the energy storage system.

[0047] The power data detection device provided by the embodiments of the present utility model can be applied to the energy storage system. Through the above settings, based on the power data detection system, the voltage, current, frequency, power and other data of the grid-connected side are collected in real time, providing real-time information for the control and management of the energy storage system. On the one hand, it can ensure the safety and efficiency of the grid connection operation; on the other hand, it can optimize the charge and discharge strategies of the energy storage system, such as charging during the low grid price period, discharging during the high price period, or providing auxiliary services such as frequency regulation and voltage support during the high grid demand period.

[0048] In some of these embodiments, the central processing unit includes a timer and a digital signal processor; wherein, the timer is used to calculate the voltage frequency value based on the AC voltage signal; the digital signal processor is used to calculate the effective voltage value and the effective current value based on the voltage digital signal and the current digital signal respectively.

[0049] With the above settings, by using the high-precision timer built into the CPU, the device can accurately capture the zero-crossing point of the square wave signal, that is, the instant when the signal changes from positive to negative or from negative to positive. By measuring the time interval between consecutive zero-crossing points, the frequency of the AC waveform can be calculated. This method not only avoids complex mathematical operations but also ensures high-precision frequency measurement. With the DSP function module built into the CPU, the device can quickly and accurately calculate the effective voltage and current values of the alternating current. The calculation of the effective value usually involves operations such as squaring, averaging, and square rooting of the signal. The floating-point arithmetic ability of the DSP plays an important role in such calculations. Moreover, by integrating multiple functions into a single device, the need for external devices is reduced, and the overall cost is lowered.

[0050] By integrating a timer and a digital signal processor into the CPU, the CPU's requirement for external hardware is reduced, the design of the power data detection device is simplified, the cost is lowered, and at the same time, the reliability and compactness of the power data detection device are improved. Among them, the timer can be used to capture the period of the AC voltage signal and then calculate the frequency value of the voltage. Due to the counting mechanism and high precision of the timer, it can provide very accurate frequency measurement results. The digital signal processor (DSP) is designed specifically for high-speed digital signal processing and can quickly execute complex mathematical operations such as Fourier transform (FFT), filtering, spectral analysis, etc., which are very useful for extracting features such as effective value, peak value, and harmonics from the voltage and current signals after A / D conversion; and the DSP usually has parallel processing capabilities, which means it can execute multiple calculation tasks simultaneously, such as calculating the effective voltage value while calculating the effective current value, improving the efficiency of data processing.

[0051] In some of these embodiments, the central processing unit further includes a storage module, and the storage module is used to store the voltage signal frequency value calculated by the timer, as well as the effective voltage value and the effective current value calculated by the digital signal processor.

[0052] The integrated storage module reduces the dependence on external storage devices, simplifies the system architecture, reduces costs and power consumption, improves the overall system reliability and usability. When the CPU or DSP needs to process a large amount of data, the storage module can act as a buffer to relieve the burden on the processor and improve the speed and efficiency of data processing. In addition, the storage module can save historical data and retain key information even after a power outage, which helps with fault analysis, trend prediction, and long-term monitoring. At the same time, the storage module also enables fast access to stored data and prevents data from being tampered with or lost.

[0053] In some of these embodiments, the central processing unit further includes at least one communication interface, and the central processing unit is further configured to send the voltage frequency value, the effective voltage value, and the effective current value to an external device via the communication interface.

[0054] Based on the communication port, the detected electrical energy data can be sent to a remote server or a monitoring center to achieve remote monitoring and management, which is particularly applicable to distributed power system scenarios or unattended facility scenarios.

[0055] In some of these embodiments, the A / D conversion module is a multi-channel A / D conversion chip.

[0056] The multi-channel A / D conversion chip allows simultaneous sampling and conversion of multiple analog signals, improving data processing efficiency and thus enhancing the efficiency of electrical energy data detection. Compared with using multiple single-channel A / D converters, a multi-channel A / D conversion chip can greatly reduce the required circuit board space, lower the hardware complexity and cost, simplify the system design and assembly process, and also helps reduce power consumption. At the same time, the multi-channel A / D conversion chip can ensure that data from all channels is collected at the same moment, avoiding errors caused by time delay or out-of-sync.

[0057] In some of these embodiments, the AC voltage signal is one-way AC voltage signal or multiple-way AC voltage signals.

[0058] According to a specific implementation manner of an embodiment of the present utility model, when using a one-way AC voltage signal, the one-way AC voltage signal can first be converted into a square wave signal based on a comparator or other waveform transformation circuit. The reference voltage of the comparator is usually set near the zero level of the AC signal to detect the zero-crossing point of the signal. Then, in the CPU, the prescaler and interrupt trigger mode of the timer are configured. When the rising edge or falling edge of the square wave signal is detected, the timer starts or stops counting. When the timer detects the first zero-crossing point, it starts counting until it detects the next zero-crossing point and then stops counting. The count value represents the number of system clock cycles during this period. Based on the count value and the system clock frequency, the period time of the square wave signal is calculated, and then the frequency is calculated using the formula f = 1 / T.

[0059] When more accurate frequency detection results are needed or the data consistency of the detection results needs to be verified, multi-channel AC voltage signal input can be used to detect the frequency, which usually involves the measurement of three-phase AC voltage signals to ensure the accuracy and reliability of the frequency measurement. Specifically, according to a specific embodiment, a waveform conversion circuit can be set for each AC voltage signal to convert the three-phase AC voltage signals into square wave signals respectively. In the CPU, an independent timer can be configured for each square wave signal, or a shared timer and complex interrupt logic can be used to measure the period of each square wave signal respectively. For each square wave signal, repeat the steps of measuring the frequency of the single-channel signal above to measure their respective period times. Average the period times of the three-phase voltage signals to obtain a more accurate frequency measurement value; or compare the frequencies of each phase to check for phase deviation or other problems in the system. By using multi-channel signal conversion to measure the frequency, the robustness and accuracy of the measurement can be improved.

[0060] The above-mentioned power data detection device provided by the embodiment of the present invention, due to adopting an architecture including an A / D conversion module and a central processor; wherein, the A / D conversion module is used to convert the received AC voltage signal and AC current signal into a voltage digital signal and a current digital signal respectively, the A / D conversion module is connected to the central processor, and is also used to send the voltage digital signal and the current digital signal to the central processor; the central processor is used to calculate the voltage frequency value based on the received AC voltage signal, and calculate the effective voltage value and the effective current value based on the received voltage digital signal and current digital signal respectively, overcoming the problems in the power data detection device in the related technology that due to including multiple high-performance chips, the design and debugging are relatively complex, the device cost is relatively high, and when there is a large amount of data to be processed simultaneously, the response time required for detection is relatively long. In addition, the errors introduced by complex algorithms and signal processing also affect the accuracy of the detection results, realizing that the power data detection can be completed only through the A / D conversion module and the central processor, simplifying the device structure, reducing the device cost, and having simple signal processing and frequency calculation logic, achieving the technical effects of improving the detection rate and detection accuracy and expanding the application scenarios of the power data detection device.

[0061] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open-ended, that is, "including but not limited to". The term "based on" is "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless clearly stated otherwise in the context, it should be understood as "one or more".

[0062] In the method embodiments provided by the present utility model, the steps recorded in the implementation manners can be executed in different orders and / or executed in parallel. In addition, the method implementation manners may include additional steps and / or omit the steps shown. The protection scope of the present utility model is not limited in this regard.

[0063] The term "embodiment" in this specification means that the specific features, structures or characteristics described in combination with the embodiments may be included in at least one embodiment of the present utility model. The phrase appears in various positions in the specification does not necessarily mean the same embodiment, nor does it mean being independent or alternative to other embodiments and mutually exclusive. The various embodiments in this specification are described in a related manner, and the same or similar parts between the embodiments are referred to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiments.

[0064] The above-described embodiments only represent several implementation manners of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation on the protection scope. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the appended claims.

Claims

1. An electric energy data detection device, characterized in that: include: A / D conversion module and central processing unit; among them, The A / D conversion module is used to convert the received AC voltage signal and AC current signal into a voltage digital signal and a current digital signal respectively. The A / D conversion module is connected to the central processing unit and is also used to send the voltage digital signal and the current digital signal to the central processing unit; The central processing unit is used to calculate a voltage frequency value based on the received AC voltage signal, and to calculate a voltage effective value and a current effective value based on the received voltage digital signal and current digital signal, respectively.

2. The device according to claim 1, characterized in that The device also includes a waveform conversion module, wherein: The waveform conversion module is used to convert the received AC voltage signal into a voltage square wave signal. The waveform conversion module is connected to the central processing unit and is also used to send the voltage square wave signal to the central processing unit so that the central processing unit calculates the voltage frequency value based on the voltage square wave signal.

3. The device according to claim 2, characterized in that The device also includes an electric energy data acquisition module, which includes a voltage sampling circuit and a current sampling circuit; wherein, One end of the voltage sampling circuit is connected to the circuit to be detected, and is used to collect the AC voltage signal in the circuit to be detected; the other end of the voltage sampling circuit is connected to the waveform conversion module and the A / D conversion module respectively, and is used to send the collected AC voltage signal to the waveform conversion module and the A / D conversion module respectively; One end of the current sampling circuit is connected to the circuit to be detected, and is used to collect the AC current signal in the circuit to be detected; the other end of the current sampling circuit is connected to the A / D conversion module, and is used to send the collected AC current signal to the A / D conversion module.

4. The device according to claim 3, characterized in that The other end of the current sampling circuit is also connected to the waveform conversion module, and is used to send the collected alternating current signal to the waveform conversion module.

5. The device according to claim 3, characterized in that The electric energy data acquisition module is connected to the grid-connected side of the energy storage system and is used to acquire the electric energy data of the grid-connected side of the energy storage system.

6. The device according to claim 1, characterized in that The central processing unit includes a timer and a digital signal processor; wherein, The timer is used to calculate the voltage frequency value based on the AC voltage signal; The digital signal processor is used to calculate the voltage effective value and the current effective value based on the voltage digital signal and the current digital signal respectively.

7. The device according to claim 6, characterized in that The central processing unit also includes a storage module, which is used to store the voltage signal frequency value calculated by the timer, and the voltage effective value and the current effective value calculated by the digital signal processor.

8. The device according to claim 7, characterized in that The central processor also includes at least one communication interface, and the central processor is further configured to send the voltage frequency value, the voltage effective value, and the current effective value to an external device via the communication interface.

9. The device according to claim 1, characterized in that The A / D conversion module is a multi-channel A / D conversion chip.

10. The device according to claim 1, characterized in that The AC voltage signal is one AC voltage signal or multiple AC voltage signals.

Images