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IPFC topology and its steady-state modeling method for power flow control of parallel double-circuit transmission lines

A technology of power flow control and double-circuit lines, which is applied to circuit devices, AC network circuits, and AC networks with the same frequency from different sources, etc. It can solve problems such as negative effects of economical and effective operation of lines, hidden safety hazards, etc., and achieve stable and effective parallel connection Effects of power flow control, avoidance of circulation, and flexible control of double-circuit lines

Inactive Publication Date: 2019-01-22
SOUTHEAST UNIV +2
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Problems solved by technology

Therefore, the dual-circuit line where the auxiliary control line adopts the traditional IPFC topology will generate circulating currents, which will have a negative impact on the economical and effective operation of the line and cause potential safety hazards

Method used

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  • IPFC topology and its steady-state modeling method for power flow control of parallel double-circuit transmission lines
  • IPFC topology and its steady-state modeling method for power flow control of parallel double-circuit transmission lines
  • IPFC topology and its steady-state modeling method for power flow control of parallel double-circuit transmission lines

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specific Embodiment approach

[0023] Firstly, the derivation formula illustrates the reasons why the IPFC topology proposed by the present invention can effectively avoid the circulation of parallel double-circuit lines and its superiority compared with the traditional IPFC topology.

[0024] as attached image 3 shown in: V i ∠θ i is the i-node voltage and phase angle at the head end of the line, V j ∠θ j is the voltage amplitude and phase angle of node j, V k ∠θ k K node voltage amplitude and phase angle, V seij ∠θ seij The amplitude and phase angle of the equivalent output voltage of the main control line series converter, V seik ∠θ seik is the amplitude and phase angle of the equivalent output voltage of the series converter of the auxiliary control line, is the current vector between nodes i and j, is the current vector between nodes i and k, P ij +jQ ij is the active and reactive power flowing between nodes i and j, P ik +jQ ik is the active and reactive power flowing between nodes i ...

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Abstract

The invention provides an IPFC topology and its steady-state modeling method for power flow control of parallel double-circuit transmission lines, the topology comprises a plurality of voltage sourceconverters, Using IPFC cross-topology connection method, A line active pow command value P (i) ref1 ( / i) and a reactive power command value Q (i) ref1 ( / i) are adopt as control targets in a parallel double-circuit main control line, In the parallel double-circuit auxiliary control line, the active power command value P (i) ref2 ( / i) is adopted as the control objective, which realizes the flexiblecontrol of the main control line power flow and the active power of the auxiliary control line. When IPFC equipment controls line power flows, the reactive power of auxiliary control line is uncontrollable, which easily causes the circulating current problem of parallel double-circuit auxiliary control line. The topology structure provided by the invention adopts the cross topology connection method of the IPFC, The decoupling of the DC side between the parallel double-circuit main control line and the parallel double-circuit auxiliary control line can effectively avoid the circulating currentproblem of the auxiliary control line in the traditional IPFC topology, realize the stable and effective power flow control of the parallel double-circuit line, and ensure the safe and effective operation of the power network.

Description

technical field [0001] The invention relates to the technical field of power system stability and control, in particular to an IPFC topology and a steady-state modeling method suitable for power flow control of parallel double-circuit lines. Background technique [0002] The interline power flow controller (IPFC), like the unified power flow controller (UPFC), is a typical representative of the third-generation FACTS device. Compared with UPFC, IPFC is a more comprehensive and powerful FACTS control device. On the one hand, it can not only directly control the power flow on the transmission line installed in the series part like UPFC, but also realize the power exchange between lines, thereby controlling the power flow between different lines; on the other hand, UPFC is controlling the power flow of its own installed lines Occasionally, it may cause the power flow of adjacent heavy-loaded lines to exceed the limit, and IPFC controls the power flow with directional character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 吴熙王亮陈曦刘玙陶加贵徐晓轶陈轩
Owner SOUTHEAST UNIV
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