CN201839095U - Intelligent transformer substation testing and simulation system - Google Patents

Abstract

The intelligent substation test simulation device is characterized in that it includes a multi-CPU computer, a 61850 communication card, a protection device, and a GOOSE switch, wherein the multi-CPU computer is connected to the 61850 communication card through a PCI bus, and the 61850 communication card is connected to the protection device through an optical fiber. Connection, GOOSE switch is used to connect computer Ethernet and GOOSE Ethernet. In addition to the unit test of various voltage and current protections, the utility model can also simulate the occurrence and removal process of various faults in the power system, and is especially suitable for commissioning of substation sites and laboratories, with good application effect and strong inheritance.

Description

Intelligent substation test simulation device

technical field

The utility model relates to a simulation device, in particular to an intelligent substation test simulation device.

Background technique

With the rapid development of communication network technology, photoelectric transformer technology, and digital protection technology, various manufacturers and research institutes have done a lot of innovative research work on smart grid digital substation technology, and have obtained smart grid digital substation research experience and a Batch results. The digital substation is an important part of building a unified and strong smart grid. The digital substation will change the primary and secondary equipment of the traditional substation, with the primary and secondary equipment of the substation as the digital object, based on the high-speed network communication platform, corresponding to each set of primary equipment All protection and measurement and control devices need to run on the network. The current, voltage and control signals required by the secondary equipment, as well as all the data generated by the protection and measurement and control devices during operation, are exchanged with the network through a unified communication protocol. It is a substation that standardizes digital information, realizes information sharing and interoperability, and realizes automation functions such as data measurement and monitoring, control and protection, and information management based on network data.

Due to historical reasons, there are various communication protocols for systems and devices in substations, such as CDT, 1801, POLLING, IEC101, IEC103, LFP, ISA, DNP, etc. There are various communication protocols for systems and devices, especially in the case of widespread application of Ethernet. Before the appearance of IEC61850 protocol, each equipment and subsystem in the substation lacked an international or domestic standard network communication protocol. Due to the inconsistency of the regulations and the lack of conformance testing, the data exchange and interconnection between IED devices, between devices and systems, and between systems is very difficult, and the joint debugging is complicated and requires a lot of time. manpower and time. The international standard "IEC61850 Substation Communication Network and System" adopts object-oriented modeling technology and a scalable architecture for future communication to achieve the goal of "one world, one technology, one standard", which is embodied in three aspects , one is interoperability, that is, smart devices provided by different manufacturers can exchange information and use these information to perform specific functions; the other is flexible configuration, which can freely allocate functions to devices and support users in various centralized and decentralized systems. The third is long-term stability, which is a future standard, because it can be developed compatible with mainstream communication technologies, and can evolve with system requirements. From the user's point of view, it can save engineering time, reduce costs, reduce risks, provide users with an easy-to-use, stable and reliable system, and ultimately improve the owner's commercial competitiveness. The application of the IEC61850 standard is the process of making the substation system networked and digitized.

With the continuous development of digital substation technology, the research on the testing methods of smart grid digital substation is also deepening. In the "Key Technology Research Framework" involved in the "Eleventh Five-Year" science and technology development plan, the State Grid Corporation of China proposed a test plan and technical research framework for digital substations: "Combining the relevant requirements of digital substation technology, taking into account the According to the test requirements, conduct comprehensive and systematic research on the test and verification environment, develop new test means and methods with digital characteristics, and test and verify the validity and consistency of the equipment and data at each functional layer of the digital substation. Using virtual instrumentation technology, Realize the computer-aided testing of digital substations through the complete virtual simulation mode test approach and the actual static mode test approach. Study the virtual prototype experiment simulation method and implementation approach and develop related tools, and establish a test routine library. Establish various simulation models, including The data source model, the data analysis model, the tested object and the digital substation component circuit model. These models need to fully consider the relevant technologies involved in the digital substation, completely analyze the site status, and simulate the actual operation status; research based on virtual instrumentation technology Completely digital test simulation environment; study networked test software and hardware platforms that meet digital substations; develop test equipment suitable for digital substations. For accuracy, reliability, and data security requirements, the principle, composition, and accuracy of test equipment are comprehensive and comprehensive. systematic research". And put forward "from the perspective of development, combined with the relevant requirements of digital substation technology, fully consider the relevant technologies involved in digital substation, complete analysis of site status, real simulation operation status, taking into account the experimental requirements of system level and device level, construction support digitalization The expected development goal of the experimental verification environment for substation technology research and application.

Contents of the invention

purpose of invention

Conventional electromagnetic voltage and current transformers are used for the conversion of voltage and current signals between primary and secondary equipment in conventional substations. Traditional protection devices deal with low-level analog signals in the system. Due to conventional mutual inductance Due to the characteristic limitation of the device, the accuracy and stability of data acquisition affect the performance of the protection device. Compared with the traditional protection device, the digital protection device in the smart substation has a great change with the external interface. The A/D conversion and isolation devices of the protection device are all part of the intelligent primary equipment to realize the so-called "near process" of the digital protection device. The connection medium between this digital protection device and the process layer is replaced by optical fiber, and the voltage and current are transmitted through the sampled value in SV format. A digital protection device that uses SV sampling value messages to transmit voltage and current signals, and GOOSE to transmit switching signals has been developed. Therefore, it is necessary to develop a power system smart substation test simulation device and test environment based on the IEC61850 standard to realize the digital protection device and digitalization. Substation testing.

Technical solutions

In order to achieve the above-mentioned purpose of the invention, the utility model adopts the following technical solutions:

The intelligent substation test simulation device is characterized in that it includes a multi-CPU computer, a 61850 communication card, a protection device, and a GOOSE switch, wherein the multi-CPU computer is connected to the 61850 communication card through a PCI bus, and the 61850 communication card is connected to the protection device through an optical fiber. Connection, GOOSE switch is used to connect computer Ethernet and GOOSE Ethernet.

Beneficial effect

The great change of the relay protection device in the intelligent digital substation has brought about the revolution of the relay protection test device. The newly developed intelligent substation test simulation device no longer requires the voltage and current source of the test device, and the test device no longer needs to consider the key issue of power amplification technology, but is replaced by network data transmission, 61850 standard modeling and other issues. In addition to unit testing of various voltage and current protections, this test simulation device can also simulate the occurrence and removal of various faults in the power system. It is especially suitable for the commissioning of substation sites and laboratories. Personnel can quickly master its use method, the device is easy to use, reliable in performance, and the real-time and anti-interference performance of output data have been significantly improved. The protocol of the device is open, all digital information can be configured, and it can realize seamless communication with any manufacturer's protection device. It is a test simulation device suitable for digital intelligent substations in the true sense.

Description of drawings

Fig. 1 is a block diagram of the overall structure of the utility model.

Detailed ways

The composition of the device

The main components of the device hardware platform are multi-CPU portable computers, IEC61850 communication cards based on PCI bus, protection devices and other equipment. The overall frame structure is shown in Figure 1, where:

1) The multi-CPU computer runs the real-time digital simulation system (RTDS) software platform to perform drawing, simulation calculation, human-computer interaction and other processing. Its function is equivalent to the intelligent switch and ECT/EVT in the process layer of the substation, providing voltage and current Acquire the Signal;

2) The multi-CPU computer packs the calculated digital signals such as voltage and current according to the IEC61850-9-1 protocol;

3) Send the IEC61850-9-1 protocol message to the communication card through multiple PCI bus slots;

4) The PCI bus-based communication card provides multiple optical fiber Ethernet ports to connect with multiple protection devices and control equipment. One optical fiber Ethernet port can complete signal transmission of 7 voltage quantities and 5 current quantities. Its function is equivalent to the merging unit (MU) in the substation process layer, and one communication card integrates the functions of 3 merging units.

The 61850 communication card provides 3 sending optical fiber ports with a transmission rate of 100Mb/s. Each sending port can complete the transmission of 7 voltage quantities and 5 current quantities in real time, meeting the data collection required by a protection device.

The synchronization between the multiple optical fiber Ethernet ports inside the 61850 communication card is controlled by the DSP processor on the board, and the synchronization between the 61850 communication card and the 61850 communication card is uniformly controlled by an external hardware synchronization signal to realize the synchronization function. The time error between synchronous conversion commands is less than lus. The switch displacement and other information generated by the protection device passes through the GOOSE network and returns to the desktop computer through the network card to participate in the topology analysis and electromagnetic transient calculation of the power grid.

device function

1) The device can provide voltage and current in the form of digital signals to the protection device under test. Based on the SV message transmitted by IEC 61850-9-1 or IEC 61850-9-2LE, it can simulate multiple merging units on site and support multiple groups of SVs Message output, used for testing of protections such as multi-side differential. The SV sending module with interrupt control makes the sampling value message sent by the test device uniform, reliable and stable.

2) The device can receive and analyze and process the action signals sent by the protection device under test. At present, there are mainly two types: tripping and closing signals transmitted by GOOSE and hard contact output signals.

3) The optical fiber Ethernet interface of the device can receive and send GOOSE messages, which can simulate interval blocking information and send them to the protection device under test with GOOSE messages, which can realize the exchange of switching information with the device under test.

4) The GOOSE information received and sent by the device can be flexibly configured according to actual engineering needs. The standard GOOSE model enables the tester to realize seamless communication with GOOSE messages in any data format.

5) The device has powerful control software, which can realize the unit test and the whole group test of the protection device, with a friendly interface and strong human-computer interaction. The control software provides basic test modules such as manual test, state sequence, and gradient test, and can also provide a whole set of test modules, differential protection test and other special protection function test modules. The device also has the monitoring and analysis of sampling value messages and the monitoring function of GOOSE switching value.

Device Specifications

The electrical and mechanical properties of the device meet the relevant national standards, and meet the requirements for the use of power system relay protection and telecontrol.

overall

AC power supply: 220VAC 15A

Normal working temperature: 0°C-35°C

Humidity: ≤90℅ non-condensing

Air pressure: 86-108Kpa

Limit working temperature: -10℃-45℃

Transport and storage temperature: -25°C-70°C

power supply

Power supply voltage: AC 220 V±10%

Power frequency: (50±2%) Hz

Host fuse: 8A

Connection method inside the emulation device

The 61850 communication card inside the device communicates with the multi-CPU computer using the PCI bus interface, and the PCI bus can provide a very high data transfer rate (132MB/s). The PCI bus has nothing to do with the CPU, nor has it to do with the clock frequency. It can be applied to various platforms and supports multi-processors and concurrent work. The PCI bus also has good scalability, allowing expansion through the PCI-PCI bridge. As long as the computer can provide enough PCI bus slots, the 61850 communication card can be expanded. Each communication card output has 12 groups of optical fiber interfaces, 6 groups are used for sending, and 6 groups are used for receiving, and the communication is connected with FC multimode optical fiber lines.

test steps

1) First, according to the definition of the protection device under test, correctly configure parameters such as sampling rate, number of general data sets, channels, maximum output voltage and multiple of output current in the application software of the test device.

2) Connect the optical fiber interface on the test simulation device to the optical fiber interface of the protection device through the optical fiber cable, the output signal of the test device can be transmitted to the protection device, and use the test line to connect the protection action signal to the input terminal of the test device.

3) Start the upper computer software in the multi-CPU computer to start the test of the protection device. Taking the test of differential protection as an example, the differential test module in the software configures the general data set according to the definition of the current of the protection device on the three sides of high, medium and low. After the test, the proportional braking coefficient, starting current, quick breaking current and operating time Wait for the results, record the experimental results in the experimental report, and complete the test of the protective device.

Claims (1)

1. intelligent substation test emulation device; it is characterized in that; comprise many CPU computer; 61850 communication cards; protective device equipment, the GOOSE switch, wherein many CPU computer is connected with 61850 communication cards by pci bus; 61850 communication cards are connected with protective device equipment by optical fiber, and the GOOSE switch is used to connect computer Ethernet and GOOSE Ethernet.

Images