A distributed harmonic measurement device

Abstract

This utility model belongs to the field of power grid harmonic detection and relates to a distributed harmonic measurement device. It includes a harmonic acquisition unit and a harmonic communication unit. Multiple harmonic acquisition units are configured. Each harmonic acquisition unit contains voltage transformers and current transformers, which are electrically connected to an analog-to-digital converter (ADC) via wires. The ADC is electrically connected to a signal processor via wires. A synchronization clock is installed inside each harmonic acquisition unit. Data transmission between the harmonic acquisition unit and the harmonic communication unit is achieved via wires. The harmonic communication unit contains a communication controller and a communication interface. In practical applications, this device enables comprehensive monitoring and analysis of harmonic sources, harmonic propagation, and harmonic effects in power systems, improving the accuracy, real-time performance, and wide-area coverage of harmonic measurements. By extracting the time-frequency characteristics of harmonics, it achieves high-resolution and high-sensitivity identification of harmonics.

Description

Technical Field

[0001] This utility model belongs to the field of power grid harmonic detection technology, specifically relating to a distributed harmonic measurement device. Background Technology

[0002] Harmonics in power systems refer to sinusoidal waves with frequencies that are integer multiples of the fundamental frequency, which can adversely affect power quality, grid security, and equipment lifespan. Therefore, effective measurement and control of harmonics are crucial for the normal operation of power systems. Currently, harmonic measurement mostly employs single-point measuring devices. However, existing single-point harmonic measuring devices cannot reflect the global distribution and variation of harmonics in the power system; they can only provide local information and cannot determine the location and characteristics of harmonic sources, making harmonic source tracing and mitigation difficult. Therefore, it is urgent for those skilled in the art to solve these problems. Utility Model Content

[0003] Therefore, in view of the above-mentioned existing problems and defects, the project team of this utility model collected relevant information, conducted multiple evaluations and considerations, and carried out continuous experiments and modifications by the project team members, which ultimately led to the emergence of this distributed harmonic measurement device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A distributed harmonic measurement device includes a harmonic acquisition unit, a voltage transformer, a current transformer, and a harmonic communication unit. Multiple sets of harmonic acquisition units are installed at various measurement locations within a power system. Each harmonic acquisition unit contains a voltage transformer and a current transformer, which are connected to the power system and electrically connected to an analog-to-digital converter (ADC) via wires. The ADC is also electrically connected to a signal processor via wires. Each harmonic acquisition unit contains a synchronous clock, which is electrically connected to the signal processor via wires. The harmonic acquisition unit is connected to the harmonic communication unit via wires. Each harmonic communication unit contains a communication controller with a communication interface, which is electrically connected to the controller via wires. A clock source is also installed on the harmonic communication unit and electrically connected to the communication controller via wires.

[0006] Furthermore, the harmonic communication unit is electrically connected to the harmonic analysis unit via wires; the harmonic analysis unit is equipped with a data storage device, which is electrically connected to the harmonic communication unit and to the data processor via wires; a human-machine interface is installed on the harmonic analysis unit, which is electrically connected to the data processor, and the human-machine interface is a touch screen.

[0007] The harmonic communication unit is electrically connected to the harmonic analysis unit via wires, ensuring fast and stable data transmission. This is crucial for the accuracy and timeliness of harmonic analysis. The harmonic analysis unit internally houses a data storage device and a data processor, connected via wires to store and process harmonic data. This makes harmonic analysis more convenient and efficient. A human-machine interface (HMI) is installed on the harmonic analysis unit, electrically connected to the data processor via a touchscreen display, allowing operators to directly interact with the system. This simplifies the operation process and improves convenience and efficiency.

[0008] Furthermore, a central processing unit is installed inside the signal processor. The central processing unit is electrically connected to the program memory inside the signal processor via wires. A data memory is installed inside the signal processor and is electrically connected to the central processing unit. Input / output interfaces are installed on the signal processor.

[0009] The connection between the central processing unit (CPU) and the signal processor, along with the installation of data storage, enables rapid processing and analysis of input signals. This is crucial for the accuracy and timeliness of signal processing. The CPU is electrically connected to the program memory via wires, allowing programs to be loaded into the signal processor for execution. This enables the signal processor to execute different algorithms and processing logic as needed. The connection between the data storage and the CPU allows for the storage and transmission of processing results. This allows the signal processor to output processed data to other devices or storage media. The signal processor is equipped with input / output interfaces, enabling connection to other devices for data input and output. This enhances the flexibility and scalability of the signal processor.

[0010] Furthermore, the program memory contains the fixed programs and constants required by the central processing unit, while the data memory contains the intermediate data and results of the signal processor.

[0011] The program memory contains the fixed programs and constants required by the central processing unit (CPU), allowing these programs to be quickly loaded into the CPU for execution. This improves the speed and efficiency of data processing. The data memory stores the intermediate data and results of the signal processor, storing data generated during processing. This is crucial for subsequent processing and analysis, while also ensuring data reliability and security. The design of the program memory and data memory allows the signal processor to flexibly load programs and store data as needed, enabling the system to adapt to different processing tasks and data volumes, and providing excellent scalability.

[0012] Furthermore, the synchronization clock is the router, and the clock source is the PTP (Precision Time Protocol) master clock.

[0013] Using a PTP master clock as the clock source enables precise time synchronization of routers. Precise time synchronization reduces clock skew in the network, improving the accuracy and efficiency of data transmission. This helps reduce data transmission latency and packet loss, improving overall network performance. Precise time synchronization also provides accurate timestamps for network management and troubleshooting. This helps determine the sequence and timing of events, assisting administrators in quickly locating and resolving problems. PTP is a widely used time synchronization protocol, compatible with other devices and systems. This allows routers to synchronize their time with other devices, achieving broader network integration and interoperability.

[0014] Furthermore, the synchronization clock and the clock source are wirelessly connected.

[0015] Wireless connectivity eliminates the limitations of wiring and connections, making the connection between the synchronization clock and the clock source more flexible and convenient.

[0016] The beneficial effects of this utility model are:

[0017] The distributed harmonic measurement device disclosed in this utility model collects harmonics generated in the power system through a harmonic acquisition unit and transmits the characteristics of the collection unit to a harmonic analysis unit through a harmonic communication unit. This enables comprehensive monitoring and analysis of harmonic sources, harmonic propagation, and harmonic effects in the power system, improving the accuracy, real-time performance, and wide-area coverage of harmonic measurements. It also achieves high-resolution and high-sensitivity harmonic identification. The device performs harmonic source tracing, assessment, and diagnosis, providing a basis and reference for harmonic mitigation. Employing wireless connection, data compression, and encryption technologies, the device achieves high-speed, efficient, and highly reliable data transmission, reducing data transmission costs and risks. The device includes a human-machine interface for user-friendly interaction, displaying and outputting harmonic measurement results and reports, as well as providing related control and setting functions. Attached Figure Description

[0018] Figure 1 This is a block diagram of the structure of the distributed harmonic measurement device proposed in this utility model;

[0019] Figure 2 This is a block diagram of the internal structure of the signal processor of the distributed harmonic measurement device proposed in this utility model.

[0020] 1-Harmonic acquisition unit; 2-Voltage transformer; 3-Current transformer; 4-Analog-to-digital converter; 5-Signal processor; 6-Synchronization clock; 7-Harmonic communication unit; 8-Communication interface; 9-Communication controller; 10-Clock source; 11-Harmonic analysis unit; 12-Human-machine interface; 13-Data processor; 14-Data storage; 15-Program storage; 16-Central processing unit; 17-Input / output interface; 18-Data memory. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] In the description of this utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Reference Figure 1As can be seen, the distributed harmonic measurement device includes a harmonic acquisition unit 1, a voltage transformer 2, a current transformer 3, and a harmonic communication unit 7. Multiple sets of harmonic acquisition units 1 are installed at various measurement locations within the power system. Voltage transformers 2 and 3 are installed inside each harmonic acquisition unit 1 and are connected to the power system. Voltage transformers 2 and 3 are electrically connected to an analog-to-digital converter 4 via wires. The analog-to-digital converter 4 is electrically connected to a signal processor 5 via wires. A synchronization clock 6 is installed inside each harmonic acquisition unit 1 and is electrically connected to the signal processor 5 via wires. The harmonic acquisition unit 1 transmits data to the harmonic communication unit 7 via wires. A communication controller 9 is installed inside each harmonic communication unit 7, and a communication interface 8 is installed on each harmonic communication unit 7. The communication interface 8 transmits data through… The wires are electrically connected to the communication controller 9. A clock source 10 is installed on the harmonic communication unit 7, and the clock source 10 is electrically connected to the communication controller 9 via wires. The harmonic communication unit 7 is electrically connected to the harmonic analysis unit 11 via wires. The voltage transformer 2 is responsible for converting the high-voltage signal in the power system into a low-voltage signal and performing isolation and protection. The current transformer 3 is responsible for converting the large current signal in the power system into a small current signal and performing isolation and protection. The analog-to-digital converter 4 is responsible for converting the analog signals output by the voltage transformer 2 and the current transformer 3 into digital signals and performing filtering, sampling, and quantization. The signal processor 5 is responsible for performing Fast Fourier Transform (FFT) on the digital signal, extracting parameters such as the amplitude, phase, and frequency of the harmonics, and performing data compression and encryption. The synchronization clock 6 is responsible for synchronizing with the clock 10 of the harmonic communication unit 7 to ensure that the data at each measurement point has a consistent time reference.

[0024] The working principle of the communication controller 9 is as follows: First, each harmonic acquisition unit 1 receives the digital signal after data compression and encryption, and stores it in an internal buffer; then, according to the preset communication protocol and strategy, it encapsulates, encodes, modulates, and processes the digital signal, and sends it to the harmonic analysis unit 11 through the communication interface; next, it receives the digital signal after demodulation, decoding, decapsulation, and other processing from the harmonic analysis unit 11, and stores it in an internal buffer; finally, it decrypts and decompresses the digital signal, and sends it to each harmonic acquisition unit 1 through the communication interface 8.

[0025] In specific implementation of the embodiments of this utility model, such as Figure 1As shown, a data storage unit 14 is installed inside the harmonic analysis unit 11. The data storage unit 14 is electrically connected to the harmonic communication unit 7. The data storage unit 14 is electrically connected to the data processor 13 via wires. A human-machine interface 12 is installed on the harmonic analysis unit 11 and is electrically connected to the data processor 13. The human-machine interface 12 is a touch screen. The working principle of the harmonic analysis unit 11 is as follows: First, it receives data from each harmonic acquisition unit 1 after data compression and encryption from the communication controller 9 and stores it in the data storage unit 14. Then, it reads the data to be processed from the data storage unit 14 and performs wavelet transform, Hilbert-Huang transform, and other methods on the data according to preset algorithms and parameters to extract the time-frequency characteristics of harmonics and perform harmonic source tracing, evaluation, and diagnosis. Next, it stores the processed results in the data storage unit 14 and outputs them to the user or other devices through the human-machine interface 12. Finally, it waits for the next data transmission and repeats the above process.

[0026] In specific implementation of the embodiments of this utility model, such as Figure 1 , 2 As shown, a central processing unit (CPU) 16 is installed inside the signal processor 5. The CPU 16 is electrically connected to the program memory 15 inside the signal processor 5 via wires. A data memory 18 is installed inside the signal processor 5 and is electrically connected to the CPU 16. An input / output interface 17 is installed on the signal processor 5. The working principle of the signal processor 5 is as follows: First, it receives the filtered, sampled, and quantized digital signal from the analog-to-digital converter 4 and stores it in the data memory 18. Then, it reads the pre-written program from the program memory 15 and performs FFT operation on the digital signal according to the program instructions, and stores the operation result in the data memory 18. Next, it compresses and encrypts the operation result and sends it to the harmonic communication unit 7 through the I / O interface. Finally, it waits for the next acquisition cycle to arrive and repeats the above process.

[0027] In specific implementation of the embodiments of this utility model, such as Figure 1 , 2 As shown, the synchronization clock 6 is a router, the clock source 10 is a PTP master clock, the synchronization clock 6 and the clock source 10 are wirelessly connected, the program memory 15 stores the fixed program and constants used by the central processing unit 16, the data memory 18 stores the intermediate data and results of the signal processor 16, the communication controller 9 is an existing integrated circuit chip that can implement data communication protocols and strategies, the clock source 10 refers to a device that can provide stable, accurate and reliable time or frequency signals, and the synchronization clock 6 refers to a device that can receive and track time or frequency signals from the clock source or other synchronization clocks.

[0028] In this embodiment, the harmonic acquisition unit 1 is installed at different locations in the power system. It acquires voltage and current signals in the power system through voltage transformer 2 and current transformer 3, and converts them into digital signals. The signal processor 5 inside the harmonic acquisition unit 1 performs Fast Fourier Transform (FFT) on the digital signals to extract parameters such as amplitude, phase, and frequency of the harmonics, and performs data compression and encryption. The synchronization clock 6 inside the harmonic acquisition unit 1 is synchronized with the clock source 10 of the harmonic communication unit 7 to ensure that the data at each measurement point has a consistent time reference. The harmonic communication unit 7 receives the data sent by each harmonic acquisition unit 1, and performs encapsulation, encoding, modulation, and other processing on the data according to the preset communication protocol and strategy, and sends it to the harmonic analysis unit 11. The harmonic analysis unit 11 receives and stores the data sent by the harmonic communication unit 7, and performs wavelet transform, Hilbert-Huang transform, etc. on the data according to the preset algorithm and parameters to extract the time-frequency characteristics of the harmonics, and performs harmonic source tracing, evaluation, and diagnosis. The harmonic analysis unit 11 outputs the processed results to the user or other devices and displays them on the touch screen through the human-machine interface 12.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A distributed harmonic measurement device, comprising a harmonic acquisition unit (1), a voltage transformer (2), a current transformer (3), and a harmonic communication unit (7), characterized in that: The harmonic acquisition unit (1) is provided in multiple sets, and the harmonic acquisition unit (1) is installed at multiple different measurement locations in the power system; the harmonic acquisition unit (1) is equipped with a voltage transformer (2) and a current transformer (3); the voltage transformer (2) and the current transformer (3) are connected to the power system, and the voltage transformer (2) and the current transformer (3) are electrically connected to the analog-to-digital converter (4) through wires; the analog-to-digital converter (4) is electrically connected to the signal processor (5) through wires; the harmonic acquisition unit (1) is equipped with a synchronization The clock (6) is electrically connected to the signal processor (5) via a wire; the harmonic acquisition unit (1) is connected to the harmonic communication unit (7) via a wire; the harmonic communication unit (7) is equipped with a communication controller (9); the communication controller (9) is equipped with a communication interface (8); the communication interface (8) is electrically connected to the communication controller (9) via a wire; the harmonic communication unit (7) is equipped with a clock source (10); the clock source (10) is electrically connected to the communication controller (9) via a wire.

2. The distributed harmonic measurement device according to claim 1, characterized in that: It also includes a harmonic analysis unit (11), and the harmonic communication unit (7) is electrically connected to the harmonic analysis unit (11) via a wire; the harmonic analysis unit (11) is equipped with a data storage device (14), which is electrically connected to the harmonic communication unit (7), and is electrically connected to the data processor (13) via a wire; a human-computer interaction device (12) is installed on the harmonic analysis unit (11), which is electrically connected to the data processor (13), and the human-computer interaction device (12) is a touch screen.

3. The distributed harmonic measurement device according to claim 1, characterized in that: The signal processor (5) is equipped with a central processing unit (16), which is electrically connected to the program storage (15) inside the signal processor (5) via a wire. The signal processor (5) is equipped with a data storage device (18), which is electrically connected to the central processing unit (16). The signal processor (5) is equipped with an input / output interface (17).

4. The distributed harmonic measurement device according to claim 1, characterized in that: The synchronization clock (6) is a router, and the clock source (10) is a PTP (Precision Time Protocol) master clock.

5. A distributed harmonic measurement device according to claim 4, characterized in that: The synchronization clock (6) and the clock source (10) are wirelessly connected.

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