CN201242453Y - Synthesis measuring recorder for hot working and electric parameter based on synchronous sampling - Google Patents

Abstract

A thermal and electrical parameter comprehensive measurement record analyzer based on synchronous sampling, which consists of high-voltage drive-in board, low-voltage drive-in board, GPS and torsional vibration board, analog acquisition board, wave recording board, management board, custom bus , touch screen, Ethernet interface and hard disk. The utility model realizes the comprehensive measurement of thermal parameters and electrical parameters in the power plant, realizes the synchronous sampling of thermal parameters and electrical parameters based on the synchronous sampling pulse of the GPS unified clock, and can analyze the low-frequency oscillation and electromechanical faults of the power system, record And exchange the measurements before and after the mutation to obtain the data needed for dynamic evaluation.

Description

Synchronous Sampling-Based Integrated Measuring Recorder for Thermal and Electrical Parameters

technical field

The utility model relates to an electronic instrument and equipment for analyzing low-frequency oscillation problems in a power system, in particular to a synchronous sampling-based thermal and electrical parameter comprehensive measurement record analyzer.

Background technique

In the previous studies on low-frequency oscillations in power systems, the change of prime mover power was almost ignored. Prime movers refer to steam turbines in thermal power plants, and water turbines in hydropower plants. They are all machines that provide raw power. In traditional research, the thermal process or hydraulic process of the prime mover itself is considered to be a slow process, and the rapid disturbance in the range of 0.2-2.5Hz in the thermal parameters has not been paid attention to and measured, and it is only considered when studying the long-term dynamic stability of the power system Therefore, when studying the stability of the power system, the thermal system dynamics of thermal power plants and the dynamics of water turbines and their speed control systems in hydropower plants are not considered. This situation affects the correct understanding of low-frequency oscillation problems in some power systems. On the other hand, different instruments are usually used to measure the existing thermal parameters and electrical parameters, which cannot realize synchronous data sampling. In addition, the data accuracy and data format of different instruments are often quite different, and it is almost impossible to analyze equipment and power grid faults at the same time scale.

Contents of the invention

The purpose of this utility model is to provide a thermal and electrical parameter comprehensive measurement recorder based on synchronous sampling, which can combine thermal parameters and electrical parameters in a power plant to measure together, and the measurement data has high precision and accuracy.

The thermal and electrical parameter comprehensive measurement recorder based on synchronous sampling of the utility model includes a high-voltage drive-in board, a low-voltage drive-in board, a GPS and torsional vibration board, an analog acquisition board, a wave recording board, a management board, and a custom bus , a touch screen, an Ethernet interface and a hard disk, wherein the low-voltage input board collects the input signal converted by the high-voltage input board, and sends the input signal to the recording board. The GPS and the torsional vibration board receive the externally introduced GPS second pulse, use hardware to generate a synchronous sampling pulse, and send the synchronous sampling pulse to the analog acquisition board and wave recording board through the custom bus on the instrument backplane for synchronous sampling. The analog acquisition board completes high-speed data acquisition and digital filtering, calculates the actual values of AC and DC, and sends them to the wave recording board through dual-port RAM. The wave recording board collects the data of GPS, torsional vibration board, and analog acquisition board through the dual-port RAM, and then judges whether there is any abnormality or signal mutation according to the self-defined wave recording start criterion, automatically starts the wave recording, and automatically generates COMTRADE The wave recording files in the standard data format are quickly stored in the hard disk, and the real-time and fault recording data are sent to the touch screen, and at the same time, the fixed value modification instructions of the touch screen are accepted. The management board communicates with other computers through the Ethernet interface to realize the remote management of setting value files and configuration files and the upload function of fault recording data.

Compared with the existing record analyzer, the thermal and electrical parameter comprehensive measurement recorder based on synchronous sampling of the utility model has the following advantages: 1. It can simultaneously collect AC volume (voltage or current), DC volume, and pulse volume, The nature of each channel can be configured by a fixed value, and the collected data can be processed differently according to different signal properties; 2. The data is sampled synchronously based on the GPS unified clock, so that the collected data can be analyzed on the same time coordinate system according to the absolute time scale; 3. Provide standard data format files, and third-party analysis programs can easily obtain and analyze the collected data, which provides convenience for related research work.

Description of drawings

Fig. 1 is the hardware architecture schematic diagram of the present utility model;

Fig. 2 is a schematic diagram of a synchronous sampling scheme of the present invention.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a thermal and electrical parameter comprehensive measurement recorder based on synchronous sampling, including high-voltage drive-in board 1, low-voltage drive-in board 2, GPS and torsional vibration board 3, analog acquisition board 4, and wave recording board 5 , management board 6, custom bus 7, touch screen 8, Ethernet interface 9 and hard disk 10, wherein, the low-voltage input board 2 collects the input signal converted by the high-voltage input board 1, and sends the input signal to the wave recorder plate 5. The GPS and the torsional vibration board 3 receive the GPS second pulse introduced from the outside, use hardware to generate a synchronous sampling pulse, and send the synchronous sampling pulse to the analog acquisition board 4 and the wave recording board 5 through the custom bus 7 on the back panel of the instrument for synchronous sampling . The analog acquisition board 4 completes high-speed data acquisition and digital filtering, calculates the actual values of AC and DC, and sends them to the wave recording board 5 through the dual-port RAM. The wave recording board 5 collects the data of the GPS, the torsional vibration board 3, and the analog acquisition board 4 through the dual-port RAM, and then judges whether there is an abnormality or a signal mutation according to the self-defined wave recording start criterion, and automatically starts the wave recording. It can record the data of 30 seconds before the abnormality and 5 minutes after the abnormality, automatically generate the COMTRADE standard data format recording file and quickly store it in the hard disk 10, and send the real-time and fault recording data to the touch screen 8, and accept the setting value of the touch screen 8 at the same time Modify instructions. The management board 6 communicates with other computers through the Ethernet interface 9 to realize functions such as remote management of setting value files and configuration files and uploading of fault recording data.

As shown in Figure 2, firstly, the GPS receiving unit provides a globally unified pulse-per-second signal; secondly, according to the pulse-second signal, the programmable logic device hardware is used to generate a synchronous sampling pulse; finally, the synchronous sampling pulse is sent to the The sample holder of the data acquisition board in the custom bus slot realizes the synchronous acquisition of thermal parameters and electrical parameters.

The thermal parameters and electrical parameters of the power plant, wherein the electrical parameters include: generator end protection current Ia, generator end protection current Ib, generator end protection current Ic, generator end measurement current Ia , generator terminal measurement current Ib, generator terminal measurement current Ic, generator neutral point zero-sequence current 3I0, generator terminal voltage Ua, generator terminal voltage Ub, generator terminal voltage Uc, generator Generator zero-sequence voltage 3U0, generator neutral point zero-sequence voltage 3U0', generator excitation voltage, generator excitation current, grid frequency; thermal parameters include: high-voltage side left regulating valve opening degree 1, high-voltage side left regulating valve Opening degree 2, opening degree 1 of the right regulating valve on the high pressure side, opening degree 2 of the right regulating valve on the high pressure side, opening degree 1 of the left regulating valve on the medium pressure side, opening degree 2 of the left regulating valve on the medium pressure side, opening degree of the right regulating valve on the medium pressure side 1. The opening of the right regulating valve on the medium pressure side 2. The steam pressure of the regulating stage of the high-pressure cylinder, the exhaust pressure of the high-pressure cylinder, the steam pressure of the reheater outlet, the speed of the machine head, and the phase detection signal.

Claims (1)

1, a kind of thermal technology and electric parameter composite measurement registering instrument based on synchronized sampling, comprise that height presses off entering plate (1), the low entering plate (2) that presses off, GPS and torsional oscillation plate (3), analog acquisition plate (4), record ripple plate (5), management board (6), self-defined bus (7), touch-screen (8), Ethernet interface (9) and hard disk (10), it is characterized in that: the low entering plate (2) that presses off is gathered height and is pressed off opening into signal after entering plate (1) conversion, and will open into signal and give record ripple plate (5), GPS and torsional oscillation plate (3) receive the outside GPS pulse per second (PPS) of introducing, employing hardware produces Synchronous Sampling Pulse, by self-defined bus (7) Synchronous Sampling Pulse is sent to analog acquisition plate (4) and records ripple plate (5) to be used for synchronized sampling; Analog acquisition plate (4) is finished high-speed data acquisition and digital filtering, calculates the actual value of of ac and DC quantity, sends to record ripple plate (5) by dual port RAM; Record ripple plate (5) is collected the data of GPS and torsional oscillation plate (3), analog acquisition plate (4) by dual port RAM, then according to self-defining record ripple start-up criterion, judged whether abnormal conditions or sign mutation has been arranged, automatically start the record ripple, automatically generate COMTRADE standard data format record ripple file and deposit hard disk (10) fast in, and will reach in real time and give touch-screen (8) on the fault recorder data, accept the fixed value modification instruction of touch-screen (8) simultaneously; Management board (6) communicates by Ethernet interface (9) and other computing machine, realizes the upload function of management of a definite value file and a configuration file distant place and fault recorder data.

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