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A Frequency Coordinated Control Method for Multiple DC Lines Sending Islands

A DC line and frequency coordination technology, applied in the direction of reducing/preventing power oscillation, etc., can solve a large number of problems such as cutting machines, and achieve the effect of efficient frequency control means

Active Publication Date: 2019-03-05
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, after the multi-pole blocking fault of the DC system occurs, the system needs to cut off a large number of machines and cut off its supporting power supply

Method used

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  • A Frequency Coordinated Control Method for Multiple DC Lines Sending Islands
  • A Frequency Coordinated Control Method for Multiple DC Lines Sending Islands
  • A Frequency Coordinated Control Method for Multiple DC Lines Sending Islands

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Embodiment Construction

[0033] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] A frequency coordination control method for multiple direct current lines sending out islands, comprising the following steps:

[0035] (1) Obtain the real-time power value transmitted by each DC line in real time, and calculate the real-time modulated power of each DC line according to the overload capacity of the DC line. Among them, 1.0p.u. overload is used as the upper limit of power regulation for flexible DC transmission lines, and 1.2p.u. overload is used as the upper limit of power regulation for conventional DC transmission lines, where p.u.

[0036] (2) Judging whether unipolar blocking or bipolar blocking occurs in each DC line, if so, then perform step (3), otherwise, return to step (1);

[0037] (3) Judging whether the control channels corresponding to each return DC line are normal, if so, perform step (4), othe...

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Abstract

The invention discloses a frequency coordination control method specific to send-out islands of multiple direct current circuits. When a system suffers from a single-pole or dual-pole direct current locking failure, emergency frequency control on an island power grid with severe faults is performed by adopting a direct current power improving instruction (RUNUP), a direct current frequency limiter (FLC) and control measures of performing primary frequency modulation on a generator speed regulator and performing steady control on power cutting in turns. The frequency coordination control method is applicable to a multi-loop direct current transmitting end system with a concentrated control main station.

Description

technical field [0001] The invention belongs to the technical field of safety and stability analysis of electric power systems, and in particular relates to a frequency coordination control method aiming at sending islands from multiple DC lines. Background technique [0002] The regional resource characteristics and unbalanced economic development of the Southern Power Grid determine that the Southern Power Grid needs to carry out west-to-east power transmission and cross-regional resource optimization for a long period of time. Yunnan is rich in hydropower resources. As the large-scale hydropower transmission base of the Southern Power Grid, with the continuous expansion of the power transmission scale, by 2016, after the Luxi DC back-to-back project and the ±500kV Yongren-Funing DC project are completed and put into operation, Yunnan Power Grid The 6-circuit direct current transmission system and the main grid of China Southern Power Grid are connected asynchronously. As...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 郭琦李伟韩伟强孙晓彦时伯年高鸿飞陈志民
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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