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Method for improving simulation capacity of HVDC transmission system

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

Inactive Publication Date: 2011-07-27
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

[0069] The preferred embodiments will be described in detail below with reference to the accompanying drawings. It should be emphasized that the following description is exemplary only, and is not intended to limit the scope of the invention and its application.

[0070] The polymorphic dynamic phasor method proposed in the present invention is derived from the single-phase dynamic phasor method. The traditional single-phase dynamic phasor method is based on the 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]:

[0071] x ( τ ) = Σ k = - ∞ ∞ X k ( t ) e jk ω s ...

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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-East Power Transmission Strategy and the acceleration of the national grid interconnection, long-distance and large-capacity power transmission is imperative, and AC-DC combined power transmission has become an inevitable trend in the development of modern power systems. With the operation of several HVDC transmission projects, my country will form the world's most complex multi-feed AC / DC hybrid system. This makes the mutual influence of the AC and DC systems more prominent, which complicates the stable operation of the power grid. The strengthening of the mutual influence between the DC systems also increases the risk of successive commutation failures. Therefore, it is ve...

Claims

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Application Information

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Patent Type & Authority Patents(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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