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Back-to-back flexible direct current transmission system and double-loop additional frequency control method

A power transmission system, flexible DC technology, applied in power transmission AC network, reducing/preventing power oscillation, etc., can solve the problem of less strategy research, and achieve the effect of improving frequency support, improving steady-state characteristics, and improving dynamic characteristics

Active Publication Date: 2018-05-08
HUAZHONG UNIV OF SCI & TECH +2
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Problems solved by technology

[0004] However, research on supplementary frequency control (SFC) strategies for back-to-back flexible HVDC transmission is still relatively small.

Method used

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  • Back-to-back flexible direct current transmission system and double-loop additional frequency control method
  • Back-to-back flexible direct current transmission system and double-loop additional frequency control method
  • Back-to-back flexible direct current transmission system and double-loop additional frequency control method

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Embodiment Construction

[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0057] The present invention provides a back-to-back flexible direct current transmission system, the structural diagram of which is as follows figure 1 As shown, the back-to-back flexible DC power transmission system includes a back-to-back converter body, a basic controller, an active power additional controller and a reactive power additional controller.

[0058] The back-to-back converter body includes a rectification-side converter and an inverter-side converter, wherein the DC side of the rectification-side converter is connected to the DC side of the inverter-side converter, and the AC side ...

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Abstract

The invention provides a back-to-back flexible direct current transmission system and a double-loop additional frequency control method. The back-to-back flexible direct current transmission system comprises a back-to-back converter body, a basic controller, an active additional controller and a reactive additional controller, wherein the basic controller is used for enabling DC-side voltage of the back-to-back converter body, the transmitted active power and reactive power absorbed or sent to a power grid to keep constant according to an instruction of a constant active power control loop, aninstruction of a constant reactive power control loop, an instruction of a constant DC voltage control loop and an instruction of a constant AC voltage control loop; the active additional controlleris used for performing proportional-integral control on a frequency deviation input signal to output an active power additional reference instruction value; and the reactive additional controller is used for performing differential control on the frequency deviation input signal to output a reactive power additional reference instruction value. According to the invention, frequency support for a disturbed alternating current system is realized through changing the active power instruction value and the reactive power instruction value.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission systems, and in particular relates to a back-to-back flexible direct current transmission system and a double-loop additional frequency control method. Background technique [0002] Compared with the traditional HVDC transmission technology, the flexible DC transmission technology (VSC-HVDC) has the advantages of independent control of active and reactive power, no risk of commutation failure, and no reactive power compensation problems. The back-to-back flexible DC transmission technology (BTB-VSC-HVDC) can also realize the interconnection of two asynchronous AC power grids, thereby improving the controllability of power grid operation and reducing the risk of safe and stable operation of the power grid. However, for the two AC systems isolated by VSC-HVDC, when the AC system on the side of the flexible DC system has a load disturbance, since the flexible DC system ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/24
Inventor 李大虎孙建波姚伟曾令康文劲宇刘佳
Owner HUAZHONG UNIV OF SCI & TECH
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