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A method and system for determining the capacity of a unified power flow controller on a main network section

A power flow controller, capacity technology, applied in the direction of AC network circuits, AC networks with the same frequency from different sources, circuit devices, etc.

Active Publication Date: 2020-09-01
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method and system for determining the capacity of the unified power flow controller on the main network section to solve the problem of how to determine the optimal UPF capacity on the main network section

Method used

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  • A method and system for determining the capacity of a unified power flow controller on a main network section
  • A method and system for determining the capacity of a unified power flow controller on a main network section
  • A method and system for determining the capacity of a unified power flow controller on a main network section

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Embodiment approach

[0113] The embodiment of the present invention takes the Qinghai-Henan UHV DC half-voltage operating network frame in the northern Henan-Henan section as an example.

[0114] 1. Build the data model of UPFC connected to the AC power grid.

[0115] figure 2 It is a schematic structural diagram of Qinghai-Henan UHV DC half-voltage operation grid structure diagram according to an embodiment of the present invention. like figure 2 As shown, the Yubei-Yu section is now composed of four circuits including the 500kV Huojia-Huiji double circuit line and the Tapu-Xiangfu double circuit line. The power transmission limit in northern Henan is limited by the thermal stability limit. After the failure of the 500kV Tapu-Xiangfu circuit, the power of the other circuit reaches 1922.2MW, which exceeds the limit of overheating stability limit (1920MW). At this time, the power of the Jia-Huiji double-circuit line is 2188.2MW, and the power of the Tapu-Xiangfu double-circuit line is 2513.4MW...

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Abstract

The invention discloses a method of determining capacity of a unified power flow controller on a section of a main network. The method of determining capacity of a unified power flow controller on a section of a main network includes the steps: establishing a data model, accessing an AC power network, of a unified power flow controller UPFC; according to the preset increment gradient, increasing the power on quantity of generators in a sending terminal area; according to the fault that the line exceeds the self thermally-stabilization ration in the AC power network structure when the UPFC doesnot act, determining a first fault set; determining whether the initial fault set is identical to the first fault set, and according to the first determination result, determining the UPFC capacity required by elimination of line overload; determining whether the section power transmission capacity achieves the feasible limitation, and determining the second determination result; determining a UPFC capacity-section power transmission improvement power curve, and calculating the UPFC capacity corresponding to the saturation points in the curve; determining whether the fault of deciding the UPFC capacity in the UPFC capacity-section power transmission improvement power curve changes or not, determining the third determination result, and according to the third determination result, determining the UPFC capacity to be selected; and according to the UPFC capacity to be selected, determining the optimal UPFC capacity.

Description

technical field [0001] The present invention relates to the field of power systems, and more specifically, to a method and system for determining the capacity of a unified power flow controller on a main grid section. Background technique [0002] Unified Power Flow Controller (UPFC), as a third-generation Flexible AC Transmission system (FACTS) device, is a series-parallel combined full-control device that can handle almost all power flow control problems and transmission lines. Compensation problems are considered to be the most creative and powerful FACTS components. [0003] In view of the problem of limited power transmission capacity caused by uneven power flow distribution of transmission lines, UPFC can realize power flow transfer through the precise power flow control of the series part, and transfer the active power flow of the overloaded line to other lines, so that the power of each circuit in the transmission section is lower than that of thermal power. To stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 申旭辉张鑫马世英唐晓骏宋云亭赵国亮高雯曼陆振纲谢岩罗红梅宋洁莹张志强李晶李晓珺郑超陈得治陈湘吕思卓张恺李惠玲霍启迪李再华
Owner CHINA ELECTRIC POWER RES INST