Flexible alternating current/direct current electronic transformer checking device based on mixed sampling

An electronic transformer and mixed sampling technology, which is applied in the direction of measuring devices, instruments, and measuring electrical variables, can solve the problems that the calibration work cannot be truly completed, and the calibration work of AC and DC electronic transformers cannot be compatible. Facilitate system implementation, increase DC accuracy test, and reduce difficulty

Active Publication Date: 2015-12-30
ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER +2
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AI-Extracted Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the problem that the existing open-loop test method to verify the electronic ...
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Method used

Described high-precision DC AD acquisition circuit adopts 18 AD7690 chips to carry out high-speed acquisition DC analog data, and described high-precision AC AD acquisition circuit adopts 24 ADS1271 chips to carry out high-speed acquisition AC analog data, adopting 24 high-precision The A/D conversion chip improves the AC sampling precision of the whole system, and the 18-bit successive approximation A/D conversion chip improves the DC sampling precision of the whole system, and improves the sampling precision.
Described main control CPU module adopts and contains the CPU of high-precision constant temperature crystal oscillator, and model is the PowerPC processor of MPC8247, and its stability and operation speed are reliably guaranteed, and adopting constant temperature crystal oscillator model is JKOC36A-50MhZ, precision grade 0.001 PPM to ensure temporal stability of the data source.
The flexible AC-DC electronic transformer calibration device based on mixed sampling of the present invention adopts an embedded real-time operating system, so that the whole system has strong real-time performance, and adopts a step-up circuit to generate the required large current for testing , can test the accuracy of AC and DC electronic transformers in UPFC at different ratio points, rely on standard transformers as a benchmark for high-precision analog acquisition, and realize I/V precision conversion through non-inductive sampling resistors with high precision and low temperature coefficient. The secondary output of a small voltage signal can reflect the actual amount of applied current, which greatly reduces the accuracy requirements for the primary side signal source, reduces the difficulty and facilitates system implementation, as shown in Figure 1, including a primary current boosting circuit, high-precision DC AD Acquisition circuit, standard transformer, I/U converter, high-precision AC AD acquisition circuit, main control CPU module, digital quantity acquisition module and host computer, the electronic transformer body to be verified in the unified power flow controller through the optical fiber in ...
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Abstract

The invention discloses a flexible alternating current/direct current electronic transformer checking device based on mixed sampling. The flexible alternating current/direct current electronic transformer checking device comprises a primary rising current circuit, a high-precision alternating current AD acquisition circuit, a high-precision direct current AD acquisition circuit, a standard transformer, an I/U converter, a main-control CPU module and a digital value acquisition module; an electronic transformer body to be checked is connected in series with the standard transformer and the primary rising current circuit sequentially through an optical fiber; the standard transformer is connected with the high-precision alternating current AD acquisition circuit; the primary rising current circuit is connected with the high-precision direct current AD acquisition circuit; the high-precision alternating current AD acquisition circuit and the high-precision direct current AD acquisition circuit are connected with the main-control CPU module; a merging unit is connected with the main-control CPU module through the digital value acquisition module; the main-control CPU module also sends synchronous signals to the high-precision alternating current AD acquisition circuit and the digital value acquisition module. Through the adoption of the device, alternating current and direct current checking of the transformer in a UPFC can be realized, the use is convenient, and the application prospect is excellent.

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  • Flexible alternating current/direct current electronic transformer checking device based on mixed sampling

Examples

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Example Embodiment

[0020] The present invention will be further described below in conjunction with the accompanying drawings of the specification.
[0021] The hybrid sampling-based flexible AC/DC electronic transformer calibration device of the present invention adopts an embedded real-time operating system, so that the entire system has strong real-time performance, and a large current required for testing is generated by a primary up-current circuit. Test the accuracy of AC and DC electronic transformers in UPFC at different ratio points, relying on standard transformers as a reference for high-precision analog data acquisition, high-precision and low-temperature coefficient non-inductive sampling resistors to achieve precise I/V conversion, and secondary output A small voltage signal can reflect the true amount of current applied at a time, greatly reducing the accuracy requirements for the primary side signal source, reducing the difficulty and facilitating system implementation, such as figure 1 Shown, including primary up-current circuit, high-precision DC AD acquisition circuit, standard transformer, I/U converter, high-precision AC AD acquisition circuit, main control CPU module, digital acquisition module and host computer, unified power flow controller The internal electronic transformer body to be calibrated is connected in series with the input end of the standard transformer and the primary up-current circuit through the optical fiber. The output end of the standard transformer is connected to the input end of the high-precision AC AD acquisition circuit through the I/U converter The output terminal of the primary up-current circuit is connected with the input terminal of the high-precision DC AD acquisition circuit. The output terminals of the high-precision AC AD acquisition circuit and the high-precision DC AD acquisition circuit are respectively connected to the sampling input terminal of the main control CPU module. Connect, the input terminal of the digital acquisition module is connected with the merging unit in the unified power flow controller, the output terminal of the digital acquisition module is connected with the digital input terminal of the main control CPU module, and the main control CPU module also sends a synchronization signal to High-precision AC AD acquisition circuit, digital acquisition module, synchronization signal is responsible for marking a unified time reference for AC analog acquisition, serial data acquisition, and Ethernet data acquisition modules to ensure the time domain synchronization accuracy of all digital processes in the entire system. The CPU module controls the data communication with the host computer. The host computer completes the processing of all signals. Through the perfect AC and DC component extraction algorithm, it calculates the DC effective value, fundamental effective value, phase angle, and harmonic of the standard source and the tested object. The effective value and phase of the wave are analyzed, and the accuracy parameters such as DC accuracy, AC accuracy, and harmonic characteristics required for the calibration test are analyzed. Through time-domain time-scale debounce processing and comparative analysis, the delay of the measured object is obtained Time characteristic parameters such as time, digital discrete, and step rise time.
[0022] The input end of the digital quantity acquisition module is connected with the merging unit in the unified power flow controller through a serial data bus and an Ethernet data bus, and the digital quantity acquisition module is equipped with an FPGA chip.
[0023] The main control CPU module adopts a CPU containing a high-precision constant temperature crystal oscillator, the model is MPC8247 PowerPC processor, its stability and operation speed are reliably guaranteed, and the constant temperature crystal oscillator model is JKOC36A-50MhZ, and the accuracy level is 0.001PPM. Ensure that the time domain of the data source is stable.
[0024] The I/U converter is provided with a Karma chip-type non-inductive resistor to realize I/U conversion.
[0025] The high-precision DC AD acquisition circuit uses an 18-bit AD7690 chip for high-speed acquisition of DC analog data, the high-precision AC AD acquisition circuit uses a 24-bit ADS1271 chip for high-speed acquisition of AC analog data, and a 24-bit high-precision A/D The conversion chip improves the AC sampling accuracy of the entire system, and the 18-bit successive approximation A/D conversion chip improves the DC sampling accuracy of the entire system and improves the sampling accuracy.
[0026] The invention collects the AC current analog signal and DC voltage signal of the standard transformer as the sampling reference of the whole system, and obtains the AC and DC sampling accuracy of the electronic transformer body in the unified power flow controller (UPFC) system through testing. The test obtains the sampling delay of the entire electronic transformer system, and obtains the DC transient characteristic index through the DC step response capability test, thereby obtaining the overall parameter index of the electronic transformer in the unified power flow controller (UPFC) system.
[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the industry should understand that the present invention is not limited by the foregoing embodiments. The foregoing embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have Various changes and improvements, these changes and improvements fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.
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