CN210005601U - An Asynchronous Interconnection Test System Based on HVDC Transmission - Google Patents

Abstract

The utility model discloses an asynchronous interconnection testing system based on high-voltage direct current transmission provided by the embodiment of the present utility model, which includes a sending-end AC-DC system, a receiving-end AC system and a high-voltage direct-current transmission system. The sending-end AC-DC system and the receiving-end AC system are shown The systems are connected via a HVDC transmission system. Compared with the testing system set by the researchers in the prior art, the testing system of the present invention can not only be used for the system safety and stability characteristics, power transmission capacity, reactive power balance and voltage control of the large power grid connected by the HVDC transmission system. Problem research, and analysis of related issues such as asynchronous interconnected systems connected by multiple DC transmission systems. In addition, although the test system of the present invention is small, it includes a sending-end AC/DC system, a receiving-end system, and a high-voltage DC power transmission system connected to the sending-receiving-end system, which can reflect the related problems of the large power grid in which the AC system operates asynchronously.

Description

An Asynchronous Interconnection Test System Based on HVDC Transmission

technical field

The utility model relates to the technical field of power grid testing, in particular to an asynchronous interconnection testing system based on high-voltage direct current transmission.

Background technique

To study two asynchronous AC systems connected by a HVDC transmission system, researchers need to collect and analyze data from the grid system. HVDC transmission has the advantages of large transmission capacity, small corridor occupation, and favorable for long-distance transmission. The use of HVDC transmission is especially suitable for the unbalanced distribution of energy resources and load centers in my country, so that resources can be optimally allocated. At present, domestic provincial power grids have established 500 kV AC backbone grids, and a large number of HVDC transmission projects have been put into operation. However, many key technologies in ultra-high voltage transmission systems and HVDC transmission projects, such as power system stability, Related issues such as frequent overvoltage, reactive power balance, and submerged supply current still need further research; at the same time, the asynchronous operation system connected by HVDC transmission is complex, and the safety and stability of large power grids needs to be studied in depth. However, the existing test systems for HVDC and asynchronous networking systems are determined by researchers themselves, lacking a unified and simple test system that can reflect the main features of HVDC-based asynchronous interconnection.

SUMMARY OF THE INVENTION

The utility model provides an asynchronous interconnection testing system based on high-voltage direct current transmission, which aims to solve the problems of complex structure and inconvenient use of the current asynchronous interconnection testing system.

In order to achieve the above purpose, the present utility model provides an asynchronous interconnection test system based on high-voltage direct current transmission, including a sending-end AC-DC system, a receiving-end AC system and a high-voltage direct-current transmission system, and the sending-end AC-DC system transmits electricity through high-voltage direct current. The system is connected to the receiving end AC system;

The sending-end AC/DC system includes a sending-end first ultra-high voltage power grid system, a sending-end high-voltage DC power transmission system, a sending-end high-voltage AC power transmission system, a sending-end second ultra-high voltage power grid system, a sending-end step-down transformer and a sending-end load, The first ultra-high voltage power grid system at the sending end is connected with the AC system at the receiving end through a high-voltage direct current power transmission system, the first ultra-high voltage power grid system at the sending end is connected with the high-voltage DC power transmission system at the sending end and the high-voltage AC power transmission system at the sending end, and the The sending-end HVDC transmission system and the sending-end high-voltage AC transmission system are both connected to the sending-end load through the sending-end second ultra-high voltage grid system and the sending-end step-down transformer;

The receiving-end AC system includes a receiving-end first ultra-high voltage power grid system, a receiving-end high-voltage AC transmission system, a receiving-end second ultra-high voltage grid system, a receiving-end step-down transformer and a receiving-end load, and the receiving-end first ultra-high voltage The power grid system is connected with the sending-end AC-DC system through a high-voltage DC transmission system, and the receiving-end first ultra-high voltage power grid system is connected to the receiving-end high-voltage AC power transmission system through the receiving-end high-voltage AC power transmission system, the receiving-end second ultra-high voltage power grid system, the receiving-end step-down transformer and the receiving-end. load connection.

Further, the sending-end AC/DC system is provided with a sending-end EHV AC bus, the receiving-end AC system is provided with a receiving-end EHV AC bus, and the sending-end EHV AC bus and the receiving EHV AC bus are both. Connection with HVDC transmission system.

Further, the sending-end high-voltage AC power transmission system is a sending-end 500KV AC line, and the receiving-end high-voltage AC power transmission system is a receiving-end 500KV AC line.

Further, the first ultra-high voltage grid system at the sending end includes a first generator set and a first step-up transformer, and the first generator set and the first step-up transformer are connected by unit wiring.

Further, the sending-end second ultra-high voltage grid system includes a second generator set and a second step-up transformer, and the second generator set and the second step-up transformer are connected by unit wiring.

Further, the first ultra-high voltage grid system at the receiving end includes a third generator set and a third step-up transformer, and the third generator set and the third step-up transformer are connected by unit wiring.

Further, the receiving-end second ultra-high voltage grid system includes a fourth generator set and a fourth step-up transformer, and the fourth generator set and the fourth step-up transformer are connected by unit wiring.

Compared with the prior art, the utility model discloses an asynchronous interconnection test system based on high-voltage direct current transmission, including a sending-end AC-DC system, a receiving-end AC system and a high-voltage direct current transmission system, and the sending-end AC and DC system includes a sending-end AC and DC system. The first ultra-high voltage power grid system at the end, the high-voltage direct current transmission system at the sending end, the high-voltage AC power transmission system at the sending end, the second ultra-high voltage power grid system at the sending end, the step-down transformer at the sending end, and the load at the sending end, and the receiving end AC system includes the receiving end. The first ultra-high voltage grid system, the receiving-end high-voltage AC transmission system, the receiving-end second ultra-high voltage grid system, the receiving-end step-down transformer and the receiving-end load. Compared with the prior art, the test system is set by the researchers themselves. The test system of the present invention can be used for the research on system safety and stability characteristics, power transmission capacity, reactive power balance, etc. And related issues such as asynchronous interconnection systems connected by multiple DC transmission systems are analyzed. In addition, although the test system of the present invention is small, it includes a sending-end AC/DC system, a receiving-end system, and a high-voltage DC transmission system connected to the sending-receiving-end system, which can reflect the problems related to the asynchronous interconnection and operation of large power grids of the AC system.

Description of drawings

1 is a structural block diagram of an embodiment of an asynchronous interconnection test system based on high-voltage direct current transmission of the present invention;

FIG. 2 is a schematic diagram of an embodiment of an asynchronous interconnection testing system based on high-voltage direct current transmission of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in FIG. 1 , an asynchronous interconnection test system based on HVDC transmission according to the present invention includes a sending-end AC-DC system 1, a receiving-end AC system 2 and a high-voltage DC transmission system 3. The sending-end AC-DC system 1 1 is connected to the receiving-end AC system 2 through the HVDC transmission system 3;

The sending-end AC/DC system 1 includes a sending-end first ultra-high voltage power grid system 101, a sending-end high-voltage DC power transmission system 102, a sending-end high-voltage AC power transmission system 103, a sending-end second ultra-high voltage power grid system 104, and a sending-end step-down transformer 105 and the sending end load 106, the sending end first ultra-high voltage power grid system 101 is connected to the receiving end AC system 2 through the HVDC transmission system 3, and the sending end first ultra-high voltage power grid system 101 is connected with the sending end HVDC power transmission system 102 is connected to the sending-end high-voltage AC power transmission system 103, and the sending-end HVDC power transmission system 102 and the sending-end high-voltage AC power transmission system 103 are connected to the sending-end load through the sending-end second ultra-high voltage power grid system 104 and the sending-end step-down transformer 105 connect 106;

The receiving-end AC system 2 includes a receiving-end first ultra-high voltage power grid system 201, a receiving-end high-voltage AC power transmission system 202, a receiving-end second ultra-high voltage grid system 203, a receiving-end step-down transformer 204 and a receiving-end load 205. The first ultra-high voltage power grid system 201 at the receiving end is connected to the AC and DC system 1 at the sending end through the HVDC transmission system 3, and the first ultra-high voltage grid system 201 at the receiving end passes through the high-voltage AC transmission system 202 at the receiving end and the second ultra-high voltage at the receiving end. The power grid system 203 and the receiving end step-down transformer 204 are connected 205 to the receiving end load.

The utility model can simulate the asynchronous interconnection system of the sending and receiving ends connected by the high-voltage direct current power transmission system. Compared with the prior art, the test system is set by the researchers themselves. The system safety and stability characteristics, transmission capacity, reactive power balance and other related issues of the system, as well as related issues such as asynchronous interconnection systems connected by multiple DC transmission systems are analyzed. In addition, although the test system of the present invention is small, it includes a sending-end AC/DC system, a receiving-end system, and a high-voltage DC transmission system connected to the sending-receiving-end system, which can reflect the problems related to the asynchronous interconnection and operation of large power grids of the AC system.

Further, the sending-end AC/DC system 1 is provided with a sending-end ultra-high voltage AC bus, the receiving-end AC system 2 is provided with a receiving-end ultra-high voltage AC bus, the sending-end EHV AC bus and the receiving-end ultra-high voltage AC bus. The busbars are all connected to the HVDC transmission system 3 . In this embodiment, since the HVDC transmission system 3 is respectively connected to the sending-end AC-DC system 1 and the receiving-end AC system 2 through the ultra-high voltage AC bus, the structure of the electrical system is further simplified.

Further, the sending-end high-voltage AC power transmission system 103 is a sending-end 500KV AC line, and the receiving-end high-voltage AC power transmission system 102 is a receiving-end 500KV AC line. In this embodiment, the sending-end high-voltage AC power transmission system 103 and the receiving-end high-voltage AC power transmission system 102 are both 500KV AC lines, and there is no need to set up an independent AC power transmission system, and the AC power transmission function can only be accomplished with the AC line. It is extremely simple, and since every provincial power grid in China has established 500KV AC backbone grids, the utility model uses 500KV AC lines, which makes the test system more suitable for practical applications.

Further, the first ultra-high voltage power grid system 101 at the sending end includes a first generator set and a first step-up transformer, and the first generator set and the first step-up transformer are connected by unit wiring. As an example of this embodiment, as shown in FIG. 2 , the first ultra-high voltage power grid system 101 at the sending end includes a 500kV generator set and its step-up transformer. At present, all provincial power grids in China have established 500kV AC backbone The grid frame, the 500kV generator set is used in the utility model, which makes the test system more suitable for the application in production.

Further, the sending end second ultra-high voltage power grid system 104 includes a second generator set and a second step-up transformer, and the second generator set and the second step-up transformer are connected by unit wiring. As an example of the present embodiment, as shown in FIG. 2 , the first ultra-high voltage power grid system 104 at the sending end includes a 500kV generator set and its step-up transformer. At present, every provincial power grid in China has established a 500kV AC backbone Grid frame, 500kV generator set is used in the utility model, which makes the test system more suitable for the application in actual production.

Further, the first ultra-high voltage grid system 201 at the receiving end includes a third generator set and a third step-up transformer, and the third generator set and the third step-up transformer are connected by unit wiring. As an example of this embodiment, as shown in FIG. 2 , the first ultra-high voltage power grid system 201 at the sending end includes a 500kV generator set and its step-up transformer. Since all domestic provincial power grids have established 500kV AC backbone The grid frame, the 500kV generator set is used in the utility model, which makes the test system more suitable for the application in production.

Further, the receiving-end second ultra-high voltage grid system 203 includes a fourth generator set and a fourth step-up transformer, and the fourth generator set and the fourth step-up transformer are connected by unit wiring. As an example of this embodiment, as shown in FIG. 2 , the first ultra-high voltage power grid system 203 at the sending end includes a 500 kV generator set and its step-up transformer. Since all domestic provincial power grids have established 500 kV AC backbone The grid frame, the 500kV generator set is used in the utility model, which makes the test system more suitable for the application in production.

In this embodiment, as shown in FIG. 2 , the HVDC transmission system 3 is connected to the sending end 500kV busbar and the receiving end sending end 500kV busbar, so that the sending end AC/DC system 1 , the HVDC transmission system 3 and the receiving end AC system 2 Connect in sequence.

It can be seen that the asynchronous interconnection test system based on HVDC transmission provided by the embodiment of the present invention includes a sending end AC and DC system 1 , a receiving end AC system 2 and a HVDC transmission system 3 . The sending-end AC/DC system 1 and the receiving-end AC system 2 are connected through the HVDC transmission system 3 . Compared with the testing system set by researchers in the prior art, the testing system of the present invention can not only be used for system safety and stability characteristics, power transmission capacity, reactive power balance and voltage control of large power grids connected by high-voltage direct current transmission systems. Problem research, and analysis of related issues such as asynchronous interconnected systems connected by multiple DC transmission systems. In addition, although the test system of the present invention is small, it includes a sending-end AC/DC system, a receiving-end system, and a high-voltage DC transmission system connected to the sending-receiving-end system, which can reflect the related problems of the large power grid in which the AC system is asynchronously interconnected.

The above is the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It is also regarded as the protection scope of the present invention.

Claims (7)

1. An asynchronous interconnection test system based on HVDC transmission, comprising a sending end AC and DC system, a receiving end AC system and a HVDC transmission system, it is characterized in that: the sending end AC and DC system is connected with the receiving end by the HVDC transmission system. AC system connection; The sending-end AC/DC system includes a sending-end first ultra-high voltage power grid system, a sending-end high-voltage DC power transmission system, a sending-end high-voltage AC power transmission system, a sending-end second ultra-high voltage power grid system, a sending-end step-down transformer and a sending-end load, The first ultra-high voltage power grid system at the sending end is connected with the AC system at the receiving end through a high-voltage direct current power transmission system, the first ultra-high voltage power grid system at the sending end is connected with the high-voltage DC power transmission system at the sending end and the high-voltage AC power transmission system at the sending end, and the The sending-end HVDC transmission system and the sending-end high-voltage AC transmission system are both connected to the sending-end load through the sending-end second ultra-high voltage grid system and the sending-end step-down transformer; The receiving-end AC system includes a receiving-end first ultra-high voltage power grid system, a receiving-end high-voltage AC transmission system, a receiving-end second ultra-high voltage grid system, a receiving-end step-down transformer and a receiving-end load, and the receiving-end first ultra-high voltage The power grid system is connected with the sending-end AC-DC system through a high-voltage DC transmission system, and the receiving-end first ultra-high voltage power grid system is connected to the receiving-end high-voltage AC power transmission system through the receiving-end high-voltage AC power transmission system, the receiving-end second ultra-high voltage power grid system, the receiving-end step-down transformer and the receiving-end. load connection. 2. An asynchronous interconnection test system based on high-voltage direct current transmission according to claim 1, characterized in that, the sending-end AC-DC system is provided with a sending-end ultra-high voltage AC bus, and the receiving-end AC system is provided with a receiving-end AC bus. The ultra-high voltage AC busbar at the end is connected to the high-voltage direct current transmission system. 3. The asynchronous interconnection test system based on high-voltage direct current transmission according to claim 1, characterized in that, the sending-end high-voltage AC power transmission system is a sending-end 500KV AC line, and the receiving-end high-voltage AC power transmission system is a receiving-end high-voltage AC power transmission system. Terminal 500KV AC line. The asynchronous interconnection test system based on high-voltage direct current transmission according to any one of claims 1-3, wherein the first ultra-high-voltage power grid system at the sending end comprises a first generator set and a first liter A step-up transformer, the first generator set and the first step-up transformer are connected by unit wiring. The asynchronous interconnection test system based on high-voltage direct current transmission according to any one of claims 1-3, wherein the second ultra-high voltage power grid system at the sending end includes a second generator set and a second liter A step-up transformer, the second generator set and the second step-up transformer are connected by unit wiring. 6. The asynchronous interconnection test system based on high-voltage direct current transmission according to any one of claims 1-3, wherein the first ultra-high-voltage power grid system at the receiving end comprises a third generator set and a third liter A step-up transformer, the third generator set and the third step-up transformer are connected by unit wiring. 7 . The asynchronous interconnection test system based on high-voltage direct current transmission according to any one of claims 1 to 3, wherein the receiving-end second ultra-high-voltage power grid system includes a fourth generator set and a fourth liter A step-up transformer, the fourth generator set and the fourth step-up transformer are connected by unit wiring.

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