Method for improving simulation capacity of HVDC transmission system

A power transmission system, high-voltage direct current technology, applied in the direction of DC network circuit device, AC network circuit, information technology support system, etc., can solve the problem that the dynamic characteristics of the HVDC system cannot be correctly reflected

Inactive Publication Date: 2009-11-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

The model cannot correctly reflect the dynamic characteristics of the HVDC system when an asymmetric fault occurs

Method used

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  • Method for improving simulation capacity of HVDC transmission system
  • Method for improving simulation capacity of HVDC transmission system
  • Method for improving simulation capacity of HVDC transmission system

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Embodiment Construction

[0068] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0069] The multi-state dynamic phasor method proposed by the present invention is derived from the single-phase dynamic phasor method. The traditional single-phase dynamic phasor method is based on time-varying Fourier transform. The waveform expressed as x(τ) in the time domain can be expressed as a time-varying Fourier series in any interval τ∈(t-T, t]:

[0070] x ( τ ) = Σ k = - ∞ ∞ X k ( t ) e jk ω ...

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Abstract

The invention discloses a method for improving simulation capacity of HVDC transmission system in the technical field of electric power system operation and control technique. The technical program includes: singlet dynamic phasor is expanded to polymorphic dynamic phasor; switch function is used for indicating the characteristic of a converter valve, polymorphic dynamic phasor model of HVDC system is built considering the non-ideal state that alternating current fundamental voltage is asymmetric and direct current is mixed with ripples; curves indicating that each variable changes with time are obtained according to algebraic differentiation equations of the model; complete curves indicating that direct voltage at rectification side of the HVDC transmission system, direct voltage at contravariance side, direct line current and current at alternating current side change with time are calculated respectively by inverse Fourier transform; and finally values at the alternating current side and the direct current side of the HVDC transmission system are calculated, thus realizing the simulation of the HVDC transmission system. The invention has the advantages that the adaption to unsymmetrical fault is good, computational efficiency is high and computation is accurate.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a method for improving the simulation capability of a high-voltage direct current transmission system. Background technique [0002] With the implementation of the west-to-east power transmission strategy and the acceleration of the pace of the national interconnected grid, long-distance large-capacity power transmission is imperative, and AC-DC combined transmission has become an inevitable trend in the development of modern power systems. With the putting into operation of multiple HVDC transmission projects, my country will form the world's most complex multi-infeed AC-DC hybrid system. This makes the interaction of AC and DC systems more prominent, complicating the stable operation of the power grid, and the strengthening of the interaction between DC systems also increases the risk of successive commutation failures. Therefore, it is v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J3/38H02J3/00G06F17/50
CPCY02E60/76Y04S40/22
Inventor 刘崇茹洪善宁左江艾欣
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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