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Inter-station coupling judgment and internal model decoupling control method for flexible direct-current power transmission system

A power transmission system, flexible direct current technology, applied in the field of electric power engineering, can solve problems such as ignoring the coupling effect between controlled variables, complex interaction of converter stations, affecting converter stations, etc., to achieve good closed-loop response and good anti-interference performance and robust performance, the effect of suppressing errors

Active Publication Date: 2020-10-02
HUBEI UNIV OF TECH
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Problems solved by technology

Due to the few inertia links of the DC line, the disturbance of the converter station at one end is quickly transmitted through the DC transmission line and affects the converter station at the other end, resulting in complex interactions between the converter stations
The traditional PI decoupling control of VSC-HVDC system is only aimed at the coupling between active and reactive controlled variables in the station, ignoring the coupling effect between the controlled variables between converter stations

Method used

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  • Inter-station coupling judgment and internal model decoupling control method for flexible direct-current power transmission system
  • Inter-station coupling judgment and internal model decoupling control method for flexible direct-current power transmission system
  • Inter-station coupling judgment and internal model decoupling control method for flexible direct-current power transmission system

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Embodiment Construction

[0042] The inter-station coupling discrimination method of the VSC converter station and the design of the internal model decoupling controller of the flexible direct current transmission system are roughly divided into two steps:

[0043] Step 1: The form of the state space equation of the global small-signal model of the double-terminal flexible HVDC transmission system is given as shown in formula (1). Where the state variable x = [Δi sd1 Δi sq1 Δu sd1 Δu sq1 Δu cd1 Δu cq1 Δu d1 ΔI jj Δu d2 Δi sd2 Δi sq2 Δu sd2 Δu sq2 Δu cd2 Δu cq2 ] T , control variable u=[Δu′ d1 Δu′ q1 Δu′ d2 Δu′ q2 ] T , the output variable y=[ΔP 1 ΔQ 1 Δu d2 ΔQ 2 ] T . Through the global small-signal mathematical model of the system after linearization, the transfer function matrix of the object model is obtained through the Robust controltoolbox in MATLAB, as shown in formula (3). If the off-diagonal items in the matrix are not zero, it can be judged that there is cross-coupli...

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Abstract

The method is based on a small signal mathematical model of a double-end VSC-HVDC system. A transfer function matrix of the object model is derived, a method for judging whether electrical coupling exists in a double-end converter station or not is given, and an inter-station internal model decoupling control method for a flexible direct-current power transmission system is provided according to an internal model control principle, so as to weaken the coupling relationship between two converter stations and improve the independent operation capability of a VSC-HVDC converter station.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering. It specifically relates to the inter-station coupling discrimination and internal model decoupling control methods of the flexible direct current transmission system. Background technique [0002] Flexible direct current transmission system (VSC-HVDC) can be applied in many fields such as wind power grid connection, island power supply, urban distribution network capacity expansion and transformation. Due to the few inertial links of the DC line, the disturbance of the converter station at one end is quickly transmitted through the DC transmission line and affects the converter station at the other end, resulting in complex interactions between the converter stations. The traditional PI decoupling control of VSC-HVDC system is only aimed at the coupling between active and reactive controlled variables in the station, ignoring the coupling effect between the controlled variable...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/38
CPCH02J3/36H02J3/381H02J2203/20Y02E60/60
Inventor 余瑜徐立超
Owner HUBEI UNIV OF TECH
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