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Communication network topology and method suitable for flexible modular multilevel converter valve

A modular multi-level, communication network technology, applied in the direction of power transmission AC network, electrical components, output power conversion devices, etc. Processing time, the effect of saving communication equipment

Pending Publication Date: 2018-02-16
TIANSHENGQIAO BUREAU CSG EHV POWER TRANSMISSION CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the grid voltage is low, the number of corresponding power units is generally small, so one-to-one communication links are suitable; however, as the demand for high-voltage and large-capacity flexible direct current gradually increases, the number of power modules also increases rapidly. Traditional converter valves The communication failure rate of the internal one-to-one connection will correspondingly increase, the number of optical fibers required, and the engineering cost will also increase accordingly... Such problems cannot be avoided with the traditional communication network topology, and the new communication network topology can solve the above problems very well

Method used

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  • Communication network topology and method suitable for flexible modular multilevel converter valve
  • Communication network topology and method suitable for flexible modular multilevel converter valve
  • Communication network topology and method suitable for flexible modular multilevel converter valve

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specific Embodiment 1

[0030] Such as image 3 The internal link of the converter valve controller shown remains unchanged, and the pulse board is inserted into the pulse box (the pulse box is not). Similarly, each pair of optical ports of the pulse board is connected to a fixed power unit through a set of optical fibers. The innovative network topology The communication between the power units has been added to enable the information exchange between the units through the optical fiber. The communication network interconnection between power units can be divided into several types, and the following is a description of each interconnection network topology.

[0031] Such as image 3 It shows that the power units are divided into several groups. Considering the communication time and the amount of communication information, the number n of power units in each group is as follows: the number of optical fiber pairs for sending and receiving pulse boards≥n≥2. The power units divided into one group ar...

Embodiment 1

[0033] The improvement of the communication network topology in the first embodiment increases the engineering cost while improving the reliability. In order to improve the reliability while relatively reducing the interconnection cost, the above communication network topology can be modified so that the power units in the group are interconnected sequentially. That is to say, the number of optical fiber interfaces and optical fiber pairs interconnected in pairs is greatly reduced, and the topology reliability of the communication network without interconnection between the original power units is improved. that is, Figure 4 as shown in the figure 2The F11-13, F21-23, and Fn1-n3 communication fibers for communication between each group of power units are removed, and the status and other information of the power unit 13 is transmitted to the power unit 12 through F12-13, and then the information of the two power units is combined. It is transmitted to the power unit 11 thro...

specific Embodiment 3

[0034] All of the above power units are interconnected without reducing the overall number of optical fibers. In the case of a large number of power units and relatively low reliability requirements, such as Figure 5 The communication topology of the power unit shown can not only reduce the number of interconnected optical fibers, but also reduce the number of boards in the valve-controlled pulse screen. Its characteristic lies in grouping the power units, the number of each group is n: the number of optical fiber pairs for sending and receiving of the pulse board ≥ n ≥ 2. The power units between the groups are interconnected in pairs, and each group uses at least one set of communication optical fibers to connect with the valve-controlled pulse board interface. At least one set of optical fibers connected to the pulse board of the converter valve communicates with the valve controller for information exchange. Such as Figure 5 As shown, the power units are divided into t...

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Abstract

The invention provides a communication network topology and method suitable for a flexible modular multilevel converter valve. The communication network topology comprises a plurality of pulse plates,a plurality of transceiving fibers and a plurality of power units, wherein each pulse plate comprises a plurality of pulse plate optical openings, the plurality of power units are divided into a plurality of power unit groups, each power unit group at least comprises two power units, at least one power unit is connected with the pulse plate via the pulse plate optical opening by the transceivingfiber, and the power units in the power unit group are in fiber connection. By the communication network topology, communication connection among the power units is improved, and information interaction among the units can be achieved through fibers; and on the basis, a communication network connection among the power units can be classified to a plurality of types, the high-reliability requirement of a high-voltage large-capacity flexible modular multilevel convertor valve system and the occasion requirement of the converter valve comprising relatively many power units can be met, communication equipment is saved, and the fault rate is reduced.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission and distribution of electric power systems, in particular to a communication network topology and method suitable for flexible direct current modular multilevel converter valves. Background technique [0002] HVDC: High Voltage Direct Current (HVDC: High Voltage Direct Current) based on Modular Multilevel Converter (MMC: Modular Multilevel Converter) topology is an emerging technology in DC transmission. The advantages of low switching loss, convenient modular production, flexible and configurable capacity, and low harmonic content of relative output voltage are more and more widely used in new energy grid connection, asynchronous grid interconnection, island power supply, distribution network capacity expansion and In multi-terminal direct current transmission. [0003] The modular multi-level converter valve is the core component of the converter. Its main task is t...

Claims

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Application Information

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IPC IPC(8): H02M1/092H02J3/36
CPCH02M1/092H02J3/36Y02E60/60
Inventor 张杰王林祝海峰陈明洁张磊王健
Owner TIANSHENGQIAO BUREAU CSG EHV POWER TRANSMISSION CO
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