High-voltage direct-current integrated field detection device and method

Abstract

A high-voltage direct-current integrated field detection device comprises a programmable power signal source module and a data analysis module, and detected high-voltage direct-current equipment comprises measurement equipment, protection equipment and execution equipment. The programmable power signal source module is used for providing a required primary analog signal for measurement equipment, providing a measurement input signal required by detection for protection equipment, and providing a required protection action signal for detection of execution equipment; and the data analysis module is used for receiving feedback signals of the detected measurement equipment, the protection equipment and the execution equipment, and detecting the detected equipment in combination with an input signal of the detected equipment, the feedback signals and a preset standard specification. According to the invention, the problem that the current high-voltage direct-current engineering lacks an effective core equipment field test means is solved, and the safety and stability of the operation of the high-voltage direct-current engineering are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of high - voltage direct current, and particularly to an integrated on - site detection device and method for high - voltage direct current "measurement - protection - execution" equipment. Background Art

[0002] At present, high - voltage direct - current projects have become an important part of large power grids, and their operation stability is directly related to the essential safety of large power grids.

[0003] As the last line of defense to ensure the reliable operation of high - voltage direct - current equipment, on - site detection technology is crucial for the essential safety of direct - current systems and even power grids. Compared with traditional alternating current, direct current has new characteristics such as complex high - frequency transient characteristics and deep coupling of control and protection logics. Traditional on - site detection technology has been difficult to adapt to the above changes. The most prominent contradiction between on - site detection requirements and means in engineering is that: ① Conventional power - frequency steady - state detection technology cannot achieve the high - frequency transient response characteristics of electronic transformers; ② Traditional alternating - current protection detection ideas cannot adapt to the deep coupling of direct - current control and protection.

[0004] Therefore, it is necessary to carry out research on the detection technologies of high - voltage direct - current "measurement - protection - execution" equipment, namely electronic transformers, direct - current protection, and trip circuits, to form an effective verification ability for high - voltage direct - current protection systems. Better adapt to the development of China's new power system and ensure the essential safety of high - voltage direct - current projects and even large power grids. Summary of the Invention

[0005] In view of the technical defects and drawbacks existing in the prior art, the embodiments of the present invention provide a high - voltage direct - current integrated on - site detection device and method to overcome or at least partially solve the above problems. The specific solutions are as follows:

[0006] As a first aspect of the present invention, a high - voltage direct - current integrated on - site detection device is provided. The integrated on - site detection device includes a programmable power signal source module and a data analysis module. The high - voltage direct - current equipment to be detected includes a measurement device, a protection device, and an execution device;

[0007] The programmable power signal source module is used to provide the required primary analog signal for the measurement device, provide the measurement input signal required for detection for the protection device, and provide the protection action signal required for detection for the execution device;

[0008] The data analysis module is used to receive the feedback signals of the measurement device, protection device, and execution device to be detected, and detect the device to be detected by combining the input signals, feedback signals of the device to be detected, and preset standard specifications.

[0009] Further, the measurement device includes an electronic transformer. The detection of the measurement device includes:

[0010] The programmable power signal source module outputs different types of primary analog signals to the electronic current transformer, simulating the transfer accuracy, step response characteristics, and frequency response characteristics under actual working conditions.

[0011] The data analysis module digitally processes the primary analog signals to generate standard digital signals, and compares them in real time with the output digital signals of the converter of the electronic current transformer under test. Based on the comparison results, it determines whether the transfer error, step response characteristics, and frequency response characteristics of the electronic current transformer under test meet the preset thresholds.

[0012] Furthermore, for the detection of the DC control host and the DC protection device, it includes:

[0013] The programmable power signal source module simulates the output characteristics of the measuring device, provides the measuring input signals required for detection to the DC protection device, and simulates the control logic of the DC control host to send DC control signals to the DC protection device.

[0014] The data analysis module receives the protection action signals output by the DC protection device and records the action time. Based on the protection action signals and the action time output by the DC protection device, combined with the measuring input signals and the preset protection logic, it determines whether its functional performance meets the standards.

[0015] Furthermore, the DC control host also includes a measurement interface and a two-out-of-three device; the programmable power signal source module provides the measuring input signals required for detection to the DC protection device through the measurement interface. The detection of the protection device also includes:

[0016] The data analysis module verifies the redundant protection strategy of the protection device under test through the protection action signals output by the two-out-of-three device, and supports the integrated linkage test of differential protection, overcurrent protection, and voltage mutation protection.

[0017] Furthermore, the actuator includes a tripping circuit. The detection of the actuator includes:

[0018] The programmable power signal source module simulates the protection action signals of the protection device and outputs tripping digital signals to the tripping circuit under test.

[0019] The data analysis module real-time collects the action feedback signals and action time of the switch disconnector in the tripping circuit, and conducts correlation analysis on the tripping digital signals, the action feedback signals of the switch disconnector in the tripping circuit, and the action time to determine whether the tripping circuit is normal and can reliably execute the protection export command.

[0020] Furthermore, the integrated on-site detection device also includes an integrated detection control unit.

[0021] The integrated detection control unit is used to switch between the individual detection mode and the link linkage mode:

[0022] In the single detection mode, the programmable power signal source module provides the required primary analog signal to the measuring device alone, provides the required measurement input signal to the protection device, and provides the required protection action signal to the execution device; In the link linkage mode, the programmable power signal source module only provides the required primary analog signal to the measuring device, provides the required measurement input signal to the protection device through the measuring device, and provides the required protection action signal to the execution device through the protection device;

[0023] Among them, in the single detection mode, the measurement unit, the protection unit and the execution unit are disconnected from each other, and in the link linkage mode, the measurement unit, the protection unit and the execution unit are normally connected to each other.

[0024] As a second aspect of the present invention, a high voltage direct current integrated on-site detection method is also provided, the method comprising:

[0025] The programmable power signal source module of the integrated field detection device provides the required primary analog signal to the measuring device, provides the required measurement input signal to the protection device, and provides the required protection action signal to the execution device.

[0026] The data analysis module receives feedback signals from the detected measuring equipment, protection equipment and execution equipment, and detects the detected equipment in combination with the input signal, feedback signal and preset standard specifications of the detected equipment.

[0027] Furthermore, the measuring device includes an electronic transformer, and the detection of the measuring device includes:

[0028] Output different types of primary analog signals to the electronic transformer to simulate the transmission accuracy, step characteristics and frequency response characteristics of actual working conditions;

[0029] The primary analog signal is digitized to generate a standard digital signal, which is compared in real time with the output digital signal of the electronic transformer converter under test, and based on the comparison result, it is determined whether the transmission error, step characteristics and frequency response characteristics of the electronic transformer under test meet the preset thresholds.

[0030] Furthermore, the detection of the protection device by the DC control host and the DC protection device includes:

[0031] Simulate the output characteristics of the measuring equipment, provide the DC protection device with the measurement input signal required for detection, simulate the control logic of the DC control host, and send the DC control signal to the DC protection device;

[0032] Receive the protection action signal output by the DC protection device and record the action time. Based on the protection action signal and the action time output by the DC protection device, combined with the measured input signal and the preset protection logic, determine whether its functional performance meets the standard.

[0033] Further, the execution device includes a tripping circuit. The detection of the execution device includes:

[0034] Simulate the protection action signal of the protection device and output a tripping digital signal to the tripping circuit under test;

[0035] Real-time collect the action feedback signal and action time of the switch disconnector in the tripping circuit, and perform correlation analysis on the tripping digital signal, the action feedback signal of the switch disconnector in the tripping circuit, and the action time to determine whether the tripping circuit is normal and can reliably execute the protection outlet instruction.

[0036] The present invention has the following beneficial effects:

[0037] The present invention uses a "programmable power signal source + data analysis" dual-core architecture. The programmable power signal source module has multi-functional output characteristics and can generate, including primary side simulation signals (electronic current transformer testing), secondary side measurement signals (simulating the input of the protection device), and protection action instructions (testing the actuator). The data analysis module constructs a closed-loop detection system to achieve: real-time signal comparison (accuracy verification);

[0038] Action timing analysis (response characteristic evaluation); protection logic verification (policy compliance judgment), which solves the problem that there is a lack of effective on-site testing means for core equipment in current HVDC projects and ensures the safe and stable operation of HVDC projects. Brief Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of a high-voltage DC integrated on-site detection device provided by an embodiment of the present invention. Detailed Embodiment

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0041] Refer to Figure 1 As shown, it is a high-voltage DC integrated on-site detection device provided by an embodiment of the present invention. The integrated on-site detection device includes a programmable power signal source module and a data analysis module. The high-voltage DC equipment to be detected includes a measurement device, a protection device, and an execution device;

[0042] The programmable power signal source module is used to provide the required primary analog signal to the measuring device, provide the measurement input signal required for detection to the protection device, and provide the protection action signal required for detection to the execution device;

[0043] The data analysis module is used to receive the feedback signals of the measured measuring device, protection device, and execution device, and detect the measured device by combining the input signals, feedback signals, and preset standard specifications of the measured device.

[0044] The present invention realizes the output of multiple types of signals (primary analog signal / measurement input signal / protection action signal) through the programmable power signal source module, and forms a closed-loop detection system in combination with the data analysis module. This design integrates the functions of traditional split-type detection devices and realizes integrated detection by using signal simulation and data comparison technology..

[0045] In some embodiments, the measuring device includes an electronic current transformer, and the detection of the measuring device includes:

[0046] The programmable power signal source module outputs different types of primary analog signals to the electronic current transformer to simulate the transfer accuracy, step response characteristics, and frequency response characteristics of the actual working conditions;

[0047] The data analysis module digitally processes the primary analog signal to generate a standard digital signal, and compares it in real time with the output digital signal of the converter of the measured electronic current transformer. Based on the comparison result, it is judged whether the transfer error, step response characteristics, and frequency response characteristics of the measured electronic current transformer meet the preset threshold values.

[0048] In this embodiment, the programmable power signal source can output a composite waveform containing harmonics (2 - 15 times) and step signals (rise time ≤ 5 μs) to simulate the actual working condition load, set gradients of 20%, 50%, 80%, and 100% of the rated voltage for multi-point testing to cover the linear working range of the device, perform AD sampling on the original signal through signal processing (sampling rate ≥ 200 kS / s), eliminate high-frequency interference through FIR filtering, the data analysis module uses the FFT algorithm to analyze the phase difference between the fundamental wave and harmonic components, calibrate the angle error to ±0.1°, perform time-domain alignment (synchronization accuracy ≤ 1 μs) between the standard digital signal and the output of the measured device, and calculate the effective value error to complete the functional performance detection.

[0049] In some embodiments, for the DC control host and DC protection device, the detection of the protection device includes:

[0050] The programmable power signal source module simulates the output characteristics of the measuring device, provides the measuring input signals required for detection to the DC protection device, simulates the control logic of the DC control host, and sends DC control signals to the DC protection device;

[0051] The data analysis module receives the protection action signals output by the DC protection device and records the action time. Based on the protection action signals and the action time output by the DC protection device, combined with the measuring input signals and the preset protection logic, it determines whether its functional performance meets the standards.

[0052] In this embodiment, the programmable power signal source module is configured with a standard signal source, which can simulate the output characteristics of CT / PT (temperature drift ≤ 0.005% / °C), and can apply fault characteristic quantities, such as sudden change in differential current (threshold 1.05 times the setting value), voltage dip (drop rate ≥ 10% / ms), etc. The data analysis module receives the protection action signals output by the DC protection device and records the action time. From the moment of fault injection to the action of the outlet contact, the protection action timing is verified by timestamp comparison (microsecond level) to see if it meets the preset expectations. For example, the timestamps of the applied fault characteristics and the corresponding protection action signals should conform to the preset time standard.

[0053] Among them, the DC control host further includes a measurement interface and a two-out-of-three device; the programmable power signal source module provides the measuring input signals required for detection to the DC protection device through the measurement interface. The detection of the protection device also includes:

[0054] The data analysis module verifies the multiplex redundant protection strategy of the protection device under test through the protection action signals output by the two-out-of-three device, and supports the integrated linkage test of differential protection, overcurrent protection, and voltage mutation protection.

[0055] In the above embodiment, triple verification is achieved by using a two-out-of-three device, three protection signals are synchronously collected, and the "two judgments in agreement" principle is adopted to verify the redundancy strategy, supporting the sensitivity test of differential protection (minimum operating current 1 mA) and the response time test of voltage mutation protection. Two consistent signals and one abnormal signal can also be injected through the two-out-of-three device to verify the triggering conditions of the redundancy logic, with at least two channels simultaneously meeting the action threshold.

[0056] Among them, the execution device includes a tripping circuit. The detection of the execution device includes:

[0057] The programmable power signal source module simulates the protection action signals of the protection device and outputs tripping digital signals to the tripping circuit under test;

[0058] The data analysis module collects the action feedback signal and action time of the switch in the tripping circuit in real time, and correlates the tripping switch signal with the action feedback signal and action time of the switch in the tripping circuit to determine whether the tripping circuit is normal and whether the protection exit command can be reliably executed.

[0059] In the above embodiment, by constructing an "excitation-feedback" closed-loop detection mechanism, a dual criterion for action reliability is proposed, wherein both the excitation and feedback signals are switch signals, and the reliable execution capability of the protection command is ensured by performing signal comparison + time response characteristic evaluation on the trip switch signal and the action feedback signal.

[0060] In some embodiments, the integrated on-site detection device further includes an integrated detection control unit;

[0061] The integrated detection control unit is used to switch between the individual detection mode and the link linkage mode:

[0062] In the single detection mode, the programmable power signal source module provides the required primary analog signal to the measuring device alone, provides the measurement input signal required for detection to the protection device, and provides the required protection action signal to the execution device detection; In the link linkage mode, the programmable power signal source module only provides the required primary analog signal to the measuring device, provides the measurement input signal required for detection to the protection device through the measuring device, and provides the required protection action signal to the execution device detection through the protection device.

[0063] The data analysis module receives feedback signals from the detected measuring equipment, protection equipment and execution equipment, and detects the detected equipment in combination with the input signal, feedback signal and preset standard specifications of the detected equipment.

[0064] Among them, in the single detection mode, the measurement unit, the protection unit and the execution unit are disconnected from each other, and in the link linkage mode, the measurement unit, the protection unit and the execution unit are normally connected to each other.

[0065] Specifically,

[0066] In the single detection mode, when an abnormal current is input to the measuring device, the measuring device shall output a digital signal corresponding to the abnormal current to realize tracking and collection of the abnormal current; when an abnormal current is input to the measuring device, the measuring device shall output a digital signal corresponding to the abnormal current to realize tracking and collection of the abnormal current; when the measurement input signal required for detection, such as a fault characteristic signal, is provided to the protection device, the protection device shall output a switching signal corresponding to the protection action, when the measurement input signal required for detection, such as a fault characteristic signal, is provided to the protection device, the protection device shall output a switching signal corresponding to the protection action, when the required protection action signal is provided to the execution device, the execution device shall output a switching signal corresponding to tripping to the data analysis module, and the data analysis module judges the performance of the detected device by analyzing the feedback signal of the detected device.

[0067] In the link linkage mode, when an abnormal current is input to the measuring device, the measuring device should output a digital signal corresponding to the abnormal current to the data analysis module and the protection device; the protection device should output a switch signal corresponding to the protection action to the data analysis module and the execution device; the execution device should output a switch signal corresponding to the tripping to the data analysis module; the data analysis module analyzes the feedback signal of the detected device to determine the performance of the detected device.

[0068] The above embodiment proposes a dual-mode detection architecture: separate detection mode (unit independent verification) + linkage mode (system integration verification), defines the signal path differences of different modes (direct injection / system transmission), can simulate DC line faults, and construct the entire process from current abnormality → protection action → circuit breaker tripping, and record the end-to-end response time, that is, from the occurrence of the fault to complete disconnection.

[0069] The present invention also provides a high-voltage direct current integrated on-site detection method, the method comprising:

[0070] The programmable power signal source module of the integrated field detection device provides the required primary analog signal to the measuring device, provides the required measurement input signal to the protection device, and provides the required protection action signal to the execution device.

[0071] The data analysis module receives feedback signals from the detected measuring equipment, protection equipment and execution equipment, and detects the detected equipment in combination with the input signal, feedback signal and preset standard specifications of the detected equipment.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-voltage DC integrated on-site detection device, characterized in that, The integrated on-site detection device includes a programmable power signal source module and a data analysis module, and the high-voltage DC device to be detected includes a measuring device, a protection device, and an execution device; The programmable power signal source module is used to provide the required primary analog signal to the measuring device, provide the measuring input signal required for detection to the protection device, and provide the protection action signal required for detection to the execution device; The data analysis module is used to receive the feedback signals of the measuring device, protection device, and execution device to be detected, and detect the device to be detected by combining the input signal, feedback signal, and preset standard specifications of the device to be detected.

2. The on-site detection device for integrated high-voltage direct current according to claim 1, wherein The measuring device includes an electronic current transformer, and the detection of the measuring device includes: The programmable power signal source module outputs different types of primary analog signals to the electronic current transformer to simulate the transformation accuracy, step response characteristics, and frequency response characteristics of the actual working conditions; The data analysis module digitally processes the primary analog signal to generate a standard digital signal, and compares it in real time with the output digital signal of the converter of the electronic current transformer to be measured, and judges whether the transformation error, step response characteristics, and frequency response characteristics of the electronic current transformer to be measured meet the preset threshold based on the comparison result.

3. The on-site detection device for high-voltage DC integration according to claim 1, wherein For the DC control host and the DC protection device, the detection of the protection device includes: The programmable power signal source module simulates the output characteristics of the measuring device, provides the measuring input signal required for detection to the DC protection device, simulates the control logic of the DC control host, and sends a DC control signal to the DC protection device; The data analysis module receives the protection action signal output by the DC protection device and records the action time, and judges whether its functional performance meets the standard based on the protection action signal and the action time output by the DC protection device, combined with the measuring input signal and the preset protection logic.

4. The on-site detection device for integrated high-voltage direct current according to claim 3, wherein The DC control host also includes a measuring interface and a two-out-of-three device; the programmable power signal source module provides the measuring input signal required for detection to the DC protection device through the measuring interface, and the detection of the protection device also includes: The data analysis module verifies the multiplex redundant protection strategy of the protection device to be measured through the protection action signal output by the two-out-of-three device, and supports the integrated linkage test of differential protection, overcurrent protection, and voltage mutation protection.

5. The on-site detection device for high-voltage DC integration according to claim 1, wherein The execution device includes a trip circuit, and the detection of the execution device includes: The programmable power signal source module simulates the protection action signal of the protection device and outputs a trip digital signal to the trip circuit to be measured; The data analysis module real-time collects the action feedback signal and action time of the switch disconnector in the trip circuit, and performs correlation analysis on the trip digital signal, the action feedback signal of the switch disconnector in the trip circuit, and the action time to judge whether the trip circuit is normal and can reliably execute the protection export instruction.

6. The on-site detection device for high-voltage direct current integration according to claim 1, wherein The integrated on-site detection device also includes an integrated detection control unit; The integrated detection control unit is used to switch between the individual detection mode and the link linkage mode: In the single detection mode, the programmable power signal source module separately provides the required primary analog signal to the measurement device, provides the measurement input signal required for detection to the protection device, and provides the protection action signal required for detection to the execution device; in the link linkage mode, the programmable power signal source module only provides the required primary analog signal to the measurement device, provides the measurement input signal required for detection to the protection device through the measurement device, and provides the protection action signal required for detection to the execution device through the protection device. Among them, in the single detection mode, the measurement unit, the protection unit, and the execution unit are disconnected from each other; in the link linkage mode, the measurement unit, the protection unit, and the execution unit are normally connected to each other.

7. A high-voltage DC integrated on-site detection method, characterized in that, The method includes: Providing the required primary analog signal to the measurement device through the programmable power signal source module of the integrated on-site detection device, providing the measurement input signal required for detection to the protection device, and providing the protection action signal required for detection to the execution device. Receiving the feedback signals of the measured measurement device, protection device, and execution device through the data analysis module, and detecting the measured devices by combining the input signals, feedback signals, and preset standard specifications of the measured devices.

8. The on-site detection method for high-voltage direct current integration according to claim 7, wherein The measurement device includes an electronic current transformer. The detection of the measurement device includes: Outputting different types of primary analog signals to the electronic current transformer to simulate the transformation accuracy, step response characteristics, and frequency response characteristics of the actual working conditions. Digitally processing the primary analog signal to generate a standard digital signal, and comparing it in real time with the output digital signal of the converter of the measured electronic current transformer. Based on the comparison result, it is judged whether the transformation error, step response characteristics, and frequency response characteristics of the measured electronic current transformer meet the preset thresholds.

9. The on-site detection method for high-voltage DC integration according to claim 7, characterized in that For the DC control host and the DC protection device, the detection of the protection device includes: Simulating the output characteristics of the measurement device, providing the measurement input signal required for detection to the DC protection device, simulating the control logic of the DC control host, and sending a DC control signal to the DC protection device. Receiving the protection action signal output by the DC protection device and recording the action time. Based on the protection action signal and the action time output by the DC protection device, combined with the measurement input signal and the preset protection logic, it is determined whether its functional performance meets the standard.

10. The on-site detection method for high-voltage DC integration according to claim 7, characterized in that The execution device includes a tripping circuit. The detection of the execution device includes: Simulating the protection action signal of the protection device and outputting a tripping digital signal to the measured tripping circuit. Real-time collecting the action feedback signal and action time of the switch disconnector in the tripping circuit, and performing correlation analysis on the tripping digital signal, the action feedback signal of the switch disconnector in the tripping circuit, and the action time to judge whether the tripping circuit is normal and can reliably execute the protection export command.

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