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A Site Selection Method for Synchronous Condenser Based on Long-distance Power Transmission

A long-distance, camera-tuning technology, applied in AC network voltage adjustment, reactive power adjustment/elimination/compensation, reactive power compensation, etc., can solve problems such as reducing the failure probability of continuous commutation in multi-DC systems, and achieve reduced commutation The probability of failure, the reduction of mutual influence, and the effect of achieving a reasonable distribution

Active Publication Date: 2022-05-03
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The present invention can provide a site selection method for a synchronous condenser, which can improve the performance of a synchronous condenser in a multi-receiving AC-DC power transmission system, reduce the failure probability of local DC commutation and the failure probability of continuous commutation in a multi-DC system, and solve the problem of The problem of storage and consumption of distributed new energy

Method used

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  • A Site Selection Method for Synchronous Condenser Based on Long-distance Power Transmission
  • A Site Selection Method for Synchronous Condenser Based on Long-distance Power Transmission
  • A Site Selection Method for Synchronous Condenser Based on Long-distance Power Transmission

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comparative approach 1

[0060] Compared with Scheme 1, only static reactive power equipment is used for reactive power compensation in the comprehensive long-distance multi-receiving terminal AC-DC power transmission system of this embodiment;

comparative approach 2

[0061] Comparison scheme 2: In the comprehensive long-distance multi-receiving terminal AC-DC power transmission system of this embodiment, only static reactive power equipment and STATCOM are used for reactive power compensation.

[0062] For scheme 1, since the AC system at the receiving end has no dynamic reactive power support during the fault process, the busbar voltage of the converter station drops significantly, causing the DC transmission power to oscillate and drop sharply, such as Figure 4 , 5 As shown, a commutation failure occurs at the same time, such as Figure 6 shown.

[0063] For scheme 2, during the fault process, STATCOM quickly adjusts its reactive power output, such as image 3 As shown, 220MVar dynamic reactive power support is provided to the AC system to improve the transient voltage stability of the AC system. Therefore, compared with Scheme 1, the busbar voltage drop, DC power transmission, and DC voltage shock and drop in the converter station h...

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Abstract

A site selection method for synchronous condensers based on long-distance power transmission, which belongs to the field of site selection for reactive power compensation equipment on transmission lines; the invention aims to solve the problems of high probability of local DC commutation failure and high probability of continuous commutation failure in multi-DC systems; the invention Establish a power transmission system model based on the actual power transmission situation. The power transmission system includes a power generation unit, a transmission unit, and several receiving ends. The power generation unit includes a traditional power station and a distributed new energy power station; use power system simulation software to conduct simulation analysis of the three-phase short-circuit fault of the system , and obtain the short-circuit current when the fault occurs through the system stability model; calculate the short-circuit ratio of each feeding DC receiving end AC system, predict the weak point of voltage stability according to the short-circuit ratio of each feeding DC receiving AC system, and locate the weak point Synchronous condensers are arranged on the lines; the invention cancels the connection between various DC systems, effectively improves the grid strength of the multi-receiving AC system, enhances the system voltage support capability, and reduces the probability of commutation failure.

Description

technical field [0001] This application relates to the field of site selection for reactive power compensation equipment for transmission lines. In particular, it relates to the site selection method of the synchronous condenser for long-distance power transmission in the multi-receiving terminal direct current transmission system. Background technique [0002] Synchronous condenser, also known as synchronous compensation machine. It is a reactive power compensation device, a synchronous motor that operates in the motor state and only provides or absorbs reactive power to the power system. The equipment in the power system needs to absorb a large amount of reactive power from the grid for its excitation. Therefore, a large part of the reactive current burdened by the grid will lead to a decrease in the power factor of the grid, an increase in line loss and voltage loss, and a deterioration in the quality of power transmission, which will seriously affect the stability of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/16
CPCH02J3/16H02J3/18Y02E40/30
Inventor 吕艳玲徐春婷侯仕强杜建烨付敏白红哲
Owner HARBIN UNIV OF SCI & TECH
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