CN114333465A - Substation training system and realization method for simulating small signals - Google Patents
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Abstract
The invention discloses a substation training system and a realization method for simulating small signals, which solve the defects of the prior art and comprise the following steps: step 1, inputting a small analog quantity signal into secondary equipment of a substation training system; step 2, converting the analog quantity small signal into a digital quantity small signal after alternating current sampling; and 3, transmitting the digital quantity small signal to the measurement and control device and the relay protection device, and executing matched operation by the measurement and control device and the relay protection device according to the digital quantity small signal to finish the operation and maintenance process of the analog transformer substation.
Description
Technical Field
The invention relates to the technical field of power system training, in particular to a substation training system and a realization method for simulating small signals.
Background
With the rapid development of the intelligent power grid technology, technologies such as an electronic transformer, an intelligent high-voltage electric appliance, an optical fiber Ethernet, IEC61850 standard communication and the like are widely applied to an intelligent substation, and the types of the substation are unprecedentedly diversified due to the large amount of original comprehensive automatic substation inventory. Therefore, training is needed for operation and maintenance personnel who participate in earlier work or new operation and maintenance personnel who learn to participate in work in a wide-caliber professional setting environment, and the training requirement for the secondary technology of the transformer substation is particularly rich and diverse.
The voltage quantity obtained by connecting the secondary side of the voltage transformer and the current quantity obtained by the secondary side of the current transformer are the basis for realizing the established functions of the control and protection of the transformer substation. In various testing and training devices, because there are no current and voltage quantities for actually operating the system, a power amplifier is generally adopted to provide the required analog quantity. The power amplifier is used to amplify the current and voltage obtained from the commercial power to the required normal operation value or accident value, and then the current and voltage are connected to the acquisition device to be converted into the secondary current and voltage analog quantity required by the secondary device test.
In each level of electric power training center, an automatic relay protection practical training device obtains analog quantity basically by adopting an external power amplifier. The method has the problems of large volume of the power amplifier, more occupied space, high price and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a substation training system and a realization method for simulating small signals.
The purpose of the invention is realized by the following technical scheme:
a method for realizing a small signal simulation of a substation training system is based on the substation training system and comprises the following steps:
step 2, converting the analog quantity small signal into a digital quantity small signal after alternating current sampling;
and 3, transmitting the digital quantity small signal to the measurement and control device and the relay protection device, and executing matched operation by the measurement and control device and the relay protection device according to the digital quantity small signal to finish the operation and maintenance process of the analog transformer substation.
According to the traditional scheme, the power amplifier is adopted to provide the required analog quantity, the analog quantity is converted into the analog quantity such as secondary current, voltage and the like required by the test of the secondary device through the acquisition device, in the scheme, the analog quantity small signal is directly input into the secondary device, the power amplifier is omitted, the system is simple in structure, high in safety and low in cost. The analog quantity small signal can be obtained from historical data or experience, and the analog quantity small signal generated through the historical data or the experience is input to the secondary equipment to complete the operation and maintenance process of the simulated transformer substation. The scheme adopts a low-power information source as a basic technical route to replace the conventional technical means, greatly reduces the equipment cost under the condition of meeting the requirements, and has important significance in practical application
Preferably, in step 1, the analog small signal is input by an analog small signal source, the analog small signal source includes a plurality of synchronization signals on the same channel, each synchronization signal is sent by one signal board, the plurality of signal boards are controlled by a controller to generate signals, and the controller controls all the signals to synchronously generate the synchronization signals.
Preferably, the synchronization signal includes a normal signal and an abnormal signal, the normal signal is 3 groups of sine wave signals with a phase difference of 120 °, and the abnormal signal is any wave signal except 3 groups of sine wave signals with a phase difference of 120 °.
A transformer substation training system comprises a control terminal, a small simulation signal source, a measurement and control device and a relay protection device, wherein the small simulation signal source comprises a controller and a signal board, the controller is connected with the signal board through a plurality of signal channels, each signal channel is connected with one signal board, and the signal board is connected with the measurement and control device or the relay protection device; the system comprises a measurement and control device and a relay protection device, wherein the measurement and control device and the relay protection device are respectively provided with a signal acquisition device, the signal acquisition devices are used for acquiring the operating parameters of the measurement and control device or the relay protection device, the signal acquisition devices are connected with a control terminal, the control terminal is also connected with a controller, the control terminal is used for sending instructions to the controller to enable the controller to generate analog quantity small signals, and the control terminal is also used for receiving and recording the operating parameters of the measurement and control device or the relay protection device; the controller and the signal board of the analog small signal source are integrated in a case.
Preferably, the controller comprises a first MCU, a communication interface and a plurality of signal channels, the first MCU is connected with the control terminal through the communication interface, and the first MCU is further connected with the plurality of signal boards through the signal channels.
Preferably, the signal board comprises a second MCU, a communication interface, a high-speed DAC, a low-pass filter, a program-controlled amplifier, an output amplifier and an output port, the second MCU is connected with the controller through the communication interface, the second MCU is further connected with the high-speed DAC, the high-speed DAC is further connected with the low-pass filter, the low-pass filter is further connected with the program-controlled amplifier, the program-controlled amplifier is further connected with the output amplifier, and the output amplifier is connected with the measurement and control device or the relay protection device through the output port.
Preferably, the signal board further comprises a FLASH memory, and the FLASH memory is connected with the second MCU.
Preferably, the control terminal is a PC terminal, and the PC terminal is provided with a measurement and control screen for displaying operation and maintenance related data of the simulation transformer substation.
The invention has the beneficial effects that: the analog quantity small signal can provide analog quantity required by various secondary devices in automation, relay protection and power transformation operation and maintenance/operation and inspection professional training, and has the main technical characteristics that the analog quantity signal output waveform is convenient to set, flexible and controllable.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic block diagram of a substation training system according to the present invention;
FIG. 3 is a functional block diagram of a portion of the controller of the present invention;
FIG. 4 is a schematic block diagram of a portion of a signal plate according to the present invention
Wherein: 1. the system comprises a control terminal 2, a small analog signal source 3, a measurement and control device 4 and a relay protection device.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example (b):
a method for realizing a simulated small signal of a substation training system is based on the substation training system and comprises the following steps as shown in figure 1:
step 2, converting the analog quantity small signal into a digital quantity small signal after alternating current sampling;
and 3, transmitting the digital quantity small signal to the measurement and control device and the relay protection device, and executing matched operation by the measurement and control device and the relay protection device according to the digital quantity small signal to finish the operation and maintenance process of the analog transformer substation.
According to the traditional scheme, the power amplifier is adopted to provide the required analog quantity, the analog quantity is converted into the analog quantity such as secondary current, voltage and the like required by the test of the secondary device through the acquisition device, in the scheme, the analog quantity small signal is directly input into the secondary device, the power amplifier is omitted, the system is simple in structure, high in safety and low in cost. The analog quantity small signal can be obtained from historical data or experience, and the analog quantity small signal generated through the historical data or the experience is input to the secondary equipment to complete the operation and maintenance process of the simulated transformer substation. The scheme adopts a low-power information source as a basic technical route to replace the conventional technical means, greatly reduces the equipment cost under the condition of meeting the requirements, and has important significance in practical application
In the step 1, the analog small signal input method is to input the analog small signal through an analog small signal source, the analog small signal source comprises a plurality of synchronous signals of the same channel, each synchronous signal is sent by one signal board, the plurality of signal boards are controlled by a controller to generate the signals, and the controller controls all the signals to synchronously generate the synchronous signals.
The synchronous signals comprise normal signals and abnormal signals, the normal signals are 3 groups of sine wave signals with phase difference of 120 degrees, and the abnormal signals are arbitrary wave signals except 3 groups of sine wave signals with phase difference of 120 degrees.
A transformer substation training system comprises a control terminal, a small simulation signal source, a measurement and control device and a relay protection device, wherein the small simulation signal source comprises a controller and a signal board, the controller is connected with the signal board through a plurality of signal channels, each signal channel is connected with one signal board, and the signal board is connected with the measurement and control device or the relay protection device; the system comprises a measurement and control device and a relay protection device, wherein the measurement and control device and the relay protection device are respectively provided with a signal acquisition device, the signal acquisition devices are used for acquiring the operating parameters of the measurement and control device or the relay protection device, the signal acquisition devices are connected with a control terminal, the control terminal is also connected with a controller, the control terminal is used for sending instructions to the controller to enable the controller to generate analog quantity small signals, and the control terminal is also used for receiving and recording the operating parameters of the measurement and control device or the relay protection device; the controller and the signal board of the analog small signal source are integrated in a case.
As shown in fig. 3, the controller includes a first MCU, a communication interface and a plurality of signal channels, the first MCU is connected to the control terminal through the communication interface, and the first MCU is further connected to the plurality of signal boards through the signal channels.
As shown in fig. 4, the signal board includes a second MCU, a communication interface, a high-speed DAC, a low-pass filter, a programmable amplifier, an output amplifier, and an output port, the second MCU is connected to the controller via the communication interface, the second MCU is further connected to the high-speed DAC, the high-speed DAC is further connected to the low-pass filter, the low-pass filter is further connected to the programmable amplifier, the programmable amplifier is further connected to the output amplifier, and the output amplifier is connected to the measurement and control device or the relay protection device via the output port.
The signal board also comprises a FLASH memory, and the FLASH memory is connected with the second MCU.
The control terminal is a PC end, the PC end is provided with a measurement and control screen, and the measurement and control screen is used for displaying operation and maintenance related data of the simulation transformer substation.
In this embodiment, the analog small signal source is specifically designed as follows:
(1) output 9 channels any signal with high synchronization:
outputting 3 groups of sine wave signals with phase difference of 120 degrees under normal conditions;
and outputting the set arbitrary wave signal of the abnormal signal.
(2) The output amplitude can be controlled by a program;
(3) the phase can be controlled by a program;
(4) the control is highly flexible: all channels can be controlled, any group of signals can be controlled, and the signal output switch, amplitude and phase of any channel can be controlled; the signal (between 1 and 50) of any segment can be set to be output, and the continuous output or the output times can be controlled, wherein the times range from 1 to 999998; the output frequency of the module can be set; the set waveform data has a power-down saving function.
(5)6 paths of optical coupling input;
(6)6 paths of relay outputs;
(7) the need to have communication ports: ethernet and serial ports;
(8) module wide range mains operated: 12V-24V;
(9) the hardware needs to be provided with an SD card, and the waveform data of the module can be set in a file mode.
In practical applications, in order to achieve better use, the performance indexes of the analog small signal source are as follows:
(1) each channel can be provided with 50 normal signals (50HZ sine waves) and 50 abnormal signals; 1000 normal signals and 1000 abnormal signals or up to 64M of storage space can be added according to the later requirement; and the data needs to be stored in a power-down mode;
(2) the normal signal and the abnormal signal can be switched in a seamless connection manner;
(3) output frequency control range: 10HZ-1 kHZ;
(4) frequency accuracy of 50HZ signal: 0.005 HZ;
(5) phase requirements are as follows: setting the range: 0-359 degrees, and adjusting the precision to 1 degree;
(6) amplitude requirement: output range: 0-20Vp _ p output, adjustment precision: 0-4095.
Through the description of the above embodiments, those skilled in the art will understand that, for convenience and simplicity of description, only the division of the above functional modules is used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the specific calculation is divided into different functional modules to complete all or part of the above described functions.
In the embodiments provided in this application, it should be understood that the described structures and methods may be implemented in other ways. For example, the above-described embodiments with respect to structures are merely illustrative, and for example, a module or a unit may be divided into only one logic function, and may have another division manner in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another structure, or some features may be omitted or not executed.
Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (8)
1. A realization method for simulating small signals of a substation training system is based on the substation training system and is characterized by comprising the following steps:
step 1, inputting a small analog quantity signal into secondary equipment of a substation training system;
step 2, converting the analog quantity small signal into a digital quantity small signal after alternating current sampling;
and 3, transmitting the digital quantity small signal to the measurement and control device and the relay protection device, and executing matched operation by the measurement and control device and the relay protection device according to the digital quantity small signal to finish the operation and maintenance process of the analog transformer substation.
2. The method for realizing the analog small signal of the substation training system according to claim 1, wherein in the step 1, the analog small signal is input through an analog small signal source, the analog small signal source comprises a plurality of synchronous signals on the same channel, each synchronous signal is sent out by a signal board, the plurality of signal boards are controlled by a controller to generate signals, and the controller controls all the signals to synchronously generate the synchronous signals.
3. The method for realizing the simulated small signals of the substation training system according to claim 2, wherein the synchronous signals comprise normal signals and abnormal signals, the normal signals are 3 groups of sine wave signals with a phase difference of 120 degrees, and the abnormal signals are any wave signals except 3 groups of sine wave signals with a phase difference of 120 degrees.
4. A transformer substation training system is characterized by comprising a control terminal, a small simulation signal source, a measurement and control device and a relay protection device, wherein the small simulation signal source comprises a controller and a signal board, the controller is connected with the signal board through a plurality of signal channels, each signal channel is connected with one signal board, and the signal board is connected with the measurement and control device or the relay protection device; the system comprises a measurement and control device and a relay protection device, wherein the measurement and control device and the relay protection device are respectively provided with a signal acquisition device, the signal acquisition devices are used for acquiring the operating parameters of the measurement and control device or the relay protection device, the signal acquisition devices are connected with a control terminal, the control terminal is also connected with a controller, the control terminal is used for sending instructions to the controller to enable the controller to generate analog quantity small signals, and the control terminal is also used for receiving and recording the operating parameters of the measurement and control device or the relay protection device; the controller and the signal board of the analog small signal source are integrated in a case.
5. The substation training system according to claim 4, wherein the controller comprises a first MCU, a communication interface and a plurality of signal channels, the first MCU is connected with the control terminal through the communication interface, and the first MCU is further connected with the plurality of signal boards through the signal channels.
6. The substation training system according to claim 4, wherein the signal board comprises a second MCU, a communication interface, a high-speed DAC, a low-pass filter, a program-controlled amplifier, an output amplifier and an output port, the second MCU is connected with the controller through the communication interface, the second MCU is further connected with the high-speed DAC, the high-speed DAC is further connected with the low-pass filter, the low-pass filter is further connected with the program-controlled amplifier, the program-controlled amplifier is further connected with the output amplifier, and the output amplifier is connected with a measurement and control device or a relay protection device through the output port.
7. The substation training system according to claim 6, wherein the signal board further comprises a FLASH memory, and the FLASH memory is connected with the second MCU.
8. The substation training system according to claim 4, wherein the control terminal is a PC terminal, and the PC terminal is provided with a measurement and control screen for displaying operation and maintenance related data of the simulated substation.
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| CN102981087A (en) * | 2012-12-11 | 2013-03-20 | 辽宁省电力有限公司电力科学研究院 | Interface system for RTDS and intelligent relaying protection device |
| CN205354423U (en) * | 2015-11-17 | 2016-06-29 | 广州供电局有限公司 | Intelligent substation emulation training system |
| CN111413914A (en) * | 2020-05-21 | 2020-07-14 | 国网四川省电力公司电力科学研究院 | Signal local conversion device with small analog input |
| CN217306018U (en) * | 2021-11-08 | 2022-08-26 | 国网浙江省电力有限公司培训中心 | Transformer substation training system for realizing small signal simulation |
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- 2021-11-08 CN CN202111312289.7A patent/CN114333465A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981087A (en) * | 2012-12-11 | 2013-03-20 | 辽宁省电力有限公司电力科学研究院 | Interface system for RTDS and intelligent relaying protection device |
| CN205354423U (en) * | 2015-11-17 | 2016-06-29 | 广州供电局有限公司 | Intelligent substation emulation training system |
| CN111413914A (en) * | 2020-05-21 | 2020-07-14 | 国网四川省电力公司电力科学研究院 | Signal local conversion device with small analog input |
| CN217306018U (en) * | 2021-11-08 | 2022-08-26 | 国网浙江省电力有限公司培训中心 | Transformer substation training system for realizing small signal simulation |
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