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Method Based on Voltage Droop in Transmission System

A technology of power transmission system and voltage level, applied in the field of power transmission system, can solve problems such as difficult to realize highly accurate main control of DC power grid

Active Publication Date: 2021-08-31
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the DC voltage across the DC grid transferring power may vary to some extent, voltage droop during power transfer may make it difficult to achieve highly precise master control of the DC grid

Method used

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  • Method Based on Voltage Droop in Transmission System
  • Method Based on Voltage Droop in Transmission System
  • Method Based on Voltage Droop in Transmission System

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Embodiment Construction

[0055] Now, with reference to the accompanying drawings of the present invention will be described below, in the drawings, there is shown an exemplary embodiment of the present invention. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments of the present invention set forth herein; rather, these embodiments are provided by way of example so that this disclosure convey the invention to those skilled in the art It ranges.

[0056] figure 2 100 is a schematic diagram of the transmission system according to an embodiment of the present invention. Transmission system 100 includes a plurality of interconnected converter stations 10,11,12,13,14. like figure 2 Shown, 10,11,12,13,14 converter station in each converter station is configured to convert the DC power to AC power, or vice versa. according to figure 2 Embodiments of the present invention shown, 10,11,12,13,14 converter station each converter station co...

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PUM

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Abstract

A method (300) in a power transmission system is disclosed. The power transmission system includes a plurality of interconnected converter stations. A pilot feedback signal is determined (301). The pilot feedback signal is based on at least one voltage level in the transmission system and is common to all converter stations. A transmission system power flow parameter is determined (302) indicative of a difference between power flow into the transmission system and power flow out of the transmission system. Transmission system power flow parameters are determined based on the pilot feedback signal. For each of the converter stations, a droop error signal is determined (304) based on transmission system power flow parameters. For each of the converter stations, at least one control signal is determined (307) based at least on the droop error signal determined for that converter station.

Description

Technical field [0001] The present invention particularly relates to a method for power transmission system, a method for using the control method for controlling transmission system based on the operation of the voltage droop. Background technique [0002] Typically, it is difficult to control such a multi-terminal high voltage direct current (HVDC) transmission system operating a multi-terminal transmission system or the like. For the multi-terminal transmission systems, a terminal comprises means herein two or more converter stations interconnected transmission system. Multi-terminal DC transmission system may comprise, for example, a power grid (such as for example, HVDC grid) or is constituted by the DC power grid. Hereinafter, such a multi-terminal DC transmission system may be referred to as grid, without any loss of generality, and it should be understood that, even though reference herein may be DC power, DC power may instead be referred to as another type of multi-termi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/38H02J3/46H02J1/10
CPCH02J1/102H02J3/36H02J3/38H02J3/46Y02E60/60
Inventor B·伯格伦
Owner HITACHI ENERGY SWITZERLAND AG