CN106526524A - Electronic transformer transient state test system based on RTDS real-time simulation - Google Patents

Abstract

The invention belongs to the technical field of intelligent substation testing, in particular to an electronic transformer transient testing system based on RTDS real-time simulation. The system includes RTDS real-time simulation platform, power amplifier, data conversion device, merging unit, network message and transient fault record analysis device and electronic transformer under test. This system converts both the measured signal and the standard signal into data conforming to the IEC61850-9-2LE format, and qualitatively compares the dynamic response of the measured signal and the standard signal through the network message and the transient fault recording and analysis device. The invention can comprehensively evaluate the transient characteristics of the electronic transformer, is easy to implement, and avoids a series of problems caused by the traditional dynamic model test system when carrying out the transient test, such as poor scalability and compatibility.

Description

A Transient Test System of Electronic Transformer Based on RTDS Real-time Simulation

technical field

The invention relates to the technical field of intelligent substation testing, in particular to an electronic transformer transient testing system based on RTDS real-time simulation.

Background technique

As the source of digital and networked transmission of secondary equipment in smart substations, electronic transformers are closely related to the safety, reliability and economical operation of power systems with their accuracy and reliability. With the continuous advancement of my country's smart grid construction, the promotion and application of electronic transformers is also increasing. At present, a considerable number of electronic transformers have been officially connected to the grid. Compared with traditional electromagnetic transformers, electronic transformers solve defects such as insulation, magnetic saturation, and transient response in principle, and the secondary side directly outputs digital signals to interface with other smart devices, making it possible for secondary equipment to be networked , to meet the development requirements of smart substations. However, in the process of its application, there are still some problems that need to be solved urgently, such as: the anti-interference ability of the electronic transformer collector, the stability in outdoor harsh environments, the reliability of the power supply of the collector, and the verification of transient performance. The sensing element of the electronic current transformer is made of non-ferromagnetic material, there is no magnetic saturation phenomenon, and the linearity is good. The processing of a series of electronic circuits can restore the signal proportional to the primary current. The amplitude-frequency response of electronic circuits may have some influence on the harmonic components and non-periodic components in the transient process.

Therefore, in addition to conducting steady-state performance tests of electronic transformers, including ratio difference, angle difference, polarity, etc., it is also necessary to test their transient characteristics. The traditional transient test method uses a dynamic model test system to directly generate the transient large current required for the test to verify the transient characteristics of the electronic transformer. Its advantage is that it can more truly reflect the entire transient process and the phenomenon is intuitive. , the physical meaning is clear, and the disadvantage is that the scale of the simulation is limited by the laboratory equipment and the site, and the electrical wiring must be re-connected for each different type of test, which is labor-intensive and time-consuming, and has poor scalability and compatibility. High and difficult.

Contents of the invention

The purpose of the present invention is to solve the limitations of using the traditional dynamic model test system for the electronic transformer transient test, and provide a more convenient and comprehensive solution for evaluating the performance of the electronic transformer—a RTDS-based Real-time simulation electronic transformer transient test system.

The present invention achieves the above object through the following technical solutions.

An electronic transformer transient test system based on RTDS real-time simulation, including an RTDS real-time simulation platform, a power amplifier, a data conversion device, a merging unit, a network message and transient fault record analysis device, and an electronic transformer under test; The RTDS real-time simulation platform includes a simulation system workstation, RTDS, and GTAO, which are used to build a power system model, provide a real-time simulation environment, and output the simulation calculation results to the power amplifier through the GTAO board; the power amplifier is used to use the GTAO board The small signal output by the card is converted into an analog signal suitable for the electronic transformer under test, one of which is output to the electronic transformer under test as the measured output, and the other is output to the data conversion device as a standard source; the electronic transformer under test As the device under test, it receives the analog signal output from the power amplifier and transmits it to the merging unit in FT3 frame format; the data conversion device is used to convert the standard source signal into data conforming to the IEC61850-9-2LE format and input it into the network Message and transient fault record analysis device; the merging unit is used to convert the signal output from the electronic transformer under test in FT3 frame format into data conforming to the IEC61850-9-2LE format and access the network message and temporary A state fault record analysis device; the network message and transient fault record analysis device are used to qualitatively compare the dynamic response of the measured signal and the standard signal.

Further, the RTDS simulation platform is used to build a power system model, and output the simulated transient waveform to the power amplifier through the GTAO board.

Further, the electronic transformer to be tested is an electronic transformer scaled down according to the actual electronic transformer.

Preferably, the data conversion device adopts FPGA+DSP hardware architecture.

The beneficial effect of the present invention is that: the electronic transformer transient test system based on RTDS real-time simulation of the present invention has strong flexibility and compatibility. The RTDS simulation platform and power amplifier replace the complex and large primary equipment of the traditional dynamic model test, which has strong operability; in addition, the transient process under different fault conditions can be easily simulated through RTDS. The electronic transformer under test, as the device under test, can indirectly reflect the dynamic response characteristics of the actual operating equipment on site; through the data conversion device, it is convenient to compare the dynamic response of the device under test and the standard source to the transient process. This RTDS real-time simulation electronic transformer transient test system uses the method of combining RTDS simulation modeling and actual electronic transformer to verify its dynamic response characteristics, and can check the electronic transformer's influence on the power grid fault process and high-frequency components. , collector power failure, etc., can comprehensively measure the transient characteristics of electronic transformers, the test process is simple and reliable, and avoids a series of problems caused by the traditional dynamic model test system when carrying out transient tests, such as scalable Sexuality and poor compatibility.

Description of drawings

Fig. 1 is a schematic diagram of an electronic transformer transient test system based on RTDS real-time simulation according to the present invention.

Fig. 2 is a schematic diagram of a data conversion device in an electronic transformer transient test system based on RTDS real-time simulation according to the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, an electronic transformer transient test system based on RTDS real-time simulation includes an RTDS real-time simulation platform, a power amplifier, a data conversion device, a merging unit, a network message and transient fault record analysis device, and a Measuring electronic transformers. The RTDS real-time simulation platform includes a simulation system workstation, RTDS, and GTAO, which are used to build a power system model, provide a real-time simulation environment, and output the simulation calculation results to the power amplifier through the GTAO board. The power amplifier is used to convert the small signal output by the GTAO board into an analog signal suitable for the electronic transformer under test, one path is output to the electronic transformer under test as the measured signal, and the other path is output to the electronic transformer under test as a standard source signal. data conversion device. The electronic transformer under test, as the device under test, receives the analog signal output by the power amplifier and transmits it to the merging unit in FT3 frame format. The data conversion device is used to convert the standard source signal into data conforming to the IEC61850-9-2LE format and access the network message and transient fault record analysis device. The data conversion device adopts the hardware architecture of DSP+FPGA, including signal adjustment Circuit and ADC sampling, FPGA control module, DSP data processing unit and peripheral storage, clock circuit (as shown in Figure 2). The merging unit is used to convert the FT3 frame format output by the electronic transformer under test into data conforming to the IEC61850-9-2LE format and access the network message and transient fault record analysis device. The network message and transient fault record analysis device is used to qualitatively compare the dynamic response of the measured signal and the standard signal.

A test method of an electronic transformer transient test system based on RTDS real-time simulation is as follows:

1. Use the RTDS real-time simulation platform to build a power system model. The model can adjust the power output and load size arbitrarily, and can set faults at any location, and pass the voltage and current in the real-time state of the normal operation of the power grid and when an accident occurs through the GTAO board small signal output.

2. Then use the power amplifier to amplify and output the small signal output by the GTAO board, one of which is output to the electronic transformer under test, and the other is output to the data conversion device (as a standard source).

3. The tested electronic transformer is the electronic transformer scaled down according to the actual electronic transformer. Except for the scale reduction, the rest such as the acquisition module and power module can reflect the dynamic response characteristics of the actual operating equipment on site.

4. The data conversion device adopts a hardware architecture based on FPGA+DSP to realize the conversion of standard source analog signals into corresponding data frames that can be connected to network messages and transient fault recording and analysis devices.

5. By qualitatively comparing the response of the FT3 frame format signal output by the electronic transformer under test with the standard source signal in the fault transient process, the transient characteristics of the electronic transformer can be checked.

The present invention is not limited to the specific implementation manners described above. The above descriptions are only preferred implementation examples of the present invention, and are not intended to limit the present invention. Any modifications and equivalents made within the spirit and principles of the present invention Replacement and improvement, etc., should be included within the protection scope of the present invention.

Claims (4)

1. An electronic transformer transient test system based on RTDS real-time simulation, characterized in that: comprising RTDS real-time simulation platform, power amplifier, data conversion device, merging unit, network message and transient failure record analysis device and passive Measure the electronic transformer; the RTDS real-time simulation platform includes a simulation system workstation, RTDS, and GTAO, which are used to build a power system model, provide a real-time simulation environment, and output the simulation calculation results to the power amplifier through the GTAO board; the power The amplifier is used to convert the small signal output by the GTAO board into an analog signal suitable for the electronic transformer under test, one of which is used as the measured output to the electronic transformer under test, and the other is output as a standard source to the data conversion device; The electronic transformer under test is used as the device under test to receive the analog signal output from the power amplifier and transmit it to the merging unit in FT3 frame format; the data conversion device is used to convert the standard source signal into an IEC61850-9-2LE Format data and input the network message and transient fault record analysis device; the merging unit is used to convert the signal output from the electronic transformer under test in FT3 frame format into data conforming to the IEC61850-9-2LE format and connect Incoming network message and transient fault record analysis device; the network message and transient fault record analysis device is used to qualitatively compare the dynamic response of the measured signal and the standard signal. 2. The test system according to claim 1, wherein the RTDS simulation platform is used to build a power system model, and output the simulated transient waveform to the power amplifier through the GTAO board. 3. The test system according to claim 1, characterized in that: the electronic transformer to be tested is an electronic transformer scaled down according to the actual electronic transformer. 4. The test system according to claim 1, characterized in that: said data conversion device adopts FPGA+DSP hardware architecture.