Coordination control method for multi-terminal flexible DC power transmission system

A DC transmission system, multi-terminal flexible technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problems of DC voltage exceeding the limit, and achieve the optimal power flow, reduce equipment overvoltage, and ensure the safe operation of equipment. Effect

Active Publication Date: 2015-09-09
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of switching between the main station and the backup station, when the adjustment is not considered according to the new DC voltage setting value, the DC voltage change caused when the power flow of other stations reaches the limit value may easily cause the DC voltage to exceed the limit.

Method used

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  • Coordination control method for multi-terminal flexible DC power transmission system
  • Coordination control method for multi-terminal flexible DC power transmission system
  • Coordination control method for multi-terminal flexible DC power transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take the five-terminal system as an example: Station 1 and Station 2 adopt normal DC voltage control; Station 3, Station 4 and Station 5 adopt constant power control with droop power control. When station 1 is faulty and locked, the DC voltage increases from 1p.u. to 1.25p.u.

Embodiment 2

[0048] Take the five-terminal system as an example: Station 1 and Station 2 adopt constant DC voltage control with droop slope control; Station 3, Station 4 and Station 5 adopt constant power control with droop power control. When station 1 is faulty and locked, the DC voltage is still running stably at 1p.u., and the fluctuation is less than 1.05p.u., p.u. represents the per unit value.

[0049] Through the comparison of the two algorithms, it can be seen that in the example 1 without this control method, the DC voltage rises after the fault, which greatly reduces the insulation domain of the equipment; while the example 2 using this control method does not cause the DC voltage to change.

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Abstract

A method for coordinating and controlling a multi-terminal flexible direct current transmission system, the method comprising the following steps: (1) a sagging slope control regulated by direct current is added to a constant direct current voltage station in a multi-terminal flexible direct current transmission system; (2) the sagging slope control regulating direct current voltage is added to a constant active power station; (3) when interstation communication does not exist, two constant current voltage stations in a multi-terminal system are set as constant direct current voltage control stations, and the constant direct current voltage control stations serve as balancing nodes in a direct current network. When the system operation condition is out of the range adjusted by the direct current voltage sagging slope control, the method optimally adjusts the system direct current voltage and the power of each station, such that the direct current network can maintain the optimal voltage level after experiencing a major failure.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a coordinated control method for a multi-terminal flexible direct current transmission system, and in particular to a control method for a flexible direct current transmission converter of a multi-terminal converter station with 3 terminals or more. Background technique [0002] The Modular Multilevel Converter (MMC) used for flexible DC transmission adopts a new modular multilevel topology that is currently popular in the world. Its core unit—Sub Module (SM) is a half-bridge structure composed of two turn-off power electronic switching devices with antiparallel diodes and a capacitor. The multi-terminal connection method is the same as the two-level and three-level flexible DC transmission methods, and the T-connection converter station is connected in parallel. [0003] At present, the multi-terminal coordinated control method widely used is the mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
CPCH02J3/36Y02E60/60H02J1/00
Inventor 林畅吴学光赵岩朱琳李文津
Owner STATE GRID CORP OF CHINA
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