Distributed power flow control device and method based on voltage source inverter

A voltage source inverter, power flow control technology, applied in circuit devices, electrical components, AC network circuits, etc., can solve the problems of high cost and large volume, reduce the closing current stress, install flexible, and suppress current changes. rate effect

Pending Publication Date: 2020-11-27
CHINA EPRI ELECTRIC POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcomings of large volume and high cost in the prior art, the present invention provides a distributed power flow control device based on a voltage source inverter. The distributed power flow control device is connected in series on the high-voltage AC transmission line, which includes: mechanical switch (3), triac (4), voltage source inverter (7), DC capacitor (8) and main controller (13);

Method used

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  • Distributed power flow control device and method based on voltage source inverter
  • Distributed power flow control device and method based on voltage source inverter
  • Distributed power flow control device and method based on voltage source inverter

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Embodiment 1

[0046] Embodiment 1 of the present invention provides a distributed power flow control device based on a voltage source inverter, such as figure 1 As shown, the distributed power flow control device is connected in series on the high-voltage AC transmission line 12, which includes: a mechanical switch 3, a thyristor module 4, a voltage source inverter 7, a DC capacitor 8 and a main controller 13;

[0047] Both the mechanical switch 3 and the thyristor module 4 are connected in parallel to the AC side of the voltage source inverter 7, the DC capacitor 8 is connected in parallel to the DC side of the voltage source inverter 7, and the main controller 13 is connected to the upper-layer controller for obtaining the upper-layer control The main controller 13 is also connected to the mechanical switch 3, the thyristor module 4 and the voltage source inverter 7, and is used to send actions based on the input command, the power adjustment command or the exit command. The instruction i...

Embodiment 2

[0071] Embodiment 2 of the present invention provides a distributed power flow control method based on a voltage source inverter, and the specific flowchart is as follows figure 1 The specific process is as follows:

[0072] When the voltage source inverter 7 is turned on, the main controller 13 sends a trigger command to the voltage source inverter 7 to unlock the voltage source inverter 7 when it receives the turn-on command issued by the upper controller Send an opening command to the mechanical switch 3 to open the mechanical switch 3, and then the voltage source inverter 7 charges the DC capacitor 8; when the voltage of the DC capacitor 8 reaches the preset voltage threshold, the input process ends;

[0073] When the voltage source inverter 7 is in normal operation, the main controller 13 controls the voltage source inverter 7 by pulse width modulation based on the power adjustment instruction issued by the upper-layer controller; The power reference command value sent a...

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Abstract

The invention provides a distributed power flow control device and method based on a voltage source inverter. The distributed power flow control device comprises a mechanical switch, a thyristor module, the voltage source inverter, a direct-current capacitor and a main controller. The mechanical switch and the thyristor module are connected in parallel to the alternating current side of the voltage source inverter; the direct-current capacitor is connected to the direct-current side of the voltage source inverter in parallel; the main controller is connected with the mechanical switch, the thyristor module, the voltage source inverter and an upper-layer controller to realize flexible power flow control over the high-voltage alternating-current power transmission line; and bypass protectionis conducted on the voltage source inverter through the mechanical switch and the thyristor module to avoid damage to the voltage source inverter. The current change rate of the thyristor module at the moment of closing is suppressed through a choke inductor, meanwhile, the current flowing through the voltage source inverter is filtered, overvoltage protection maloperation caused by high-frequency common-mode interference can be effectively avoided, and the whole power flow control device is small in size, low in cost and flexible to install.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a distributed power flow control device and method based on a voltage source inverter. Background technique [0002] With the advancement of the marketization of power grid operation, it is imperative to enhance the economic competitiveness of power grid operation. Flexible AC Transmission (FACTS) is an AC transmission technology that implements flexible and fast adjustments to the impedance, voltage, phase, and power of the AC transmission system based on power electronics technology and control technology. [0003] Flexible AC transmission (FACTS) is divided into centralized flexible AC transmission and distributed flexible AC transmission (Distributed FACTS, D-FACTS), where D-FACTS includes distributed series reactance (Distributed Series Reactor, DSR), distributed static series compensator (Distributed Static Series Compensator, DSSC) and Distributed Unified Power Flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/1814Y02E40/10
Inventor 闻福岳孙继军陈宇硕詹雄李兰芳李芳灵
Owner CHINA EPRI ELECTRIC POWER ENG CO LTD
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