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Transient response analytic calculation method for high-voltage direct current power transmission system

A power transmission system, high-voltage direct current technology, applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of truncation error, limited application, large calculation amount, etc., to achieve long time consumption and no truncation error , the effect of high computational efficiency

Active Publication Date: 2015-08-05
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method not only has a large amount of calculation, but also has a slow speed, and there is a truncation error, which limits its application in large-scale systems.

Method used

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  • Transient response analytic calculation method for high-voltage direct current power transmission system
  • Transient response analytic calculation method for high-voltage direct current power transmission system
  • Transient response analytic calculation method for high-voltage direct current power transmission system

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Embodiment 1

[0042] Such as figure 1 As shown, the structure diagram of a unipolar 12-pulse HVDC transmission system is given. Among them, the rectifier side and the inverter side of the DC line are respectively equipped with single-tuned filters, and the model of the DC line uses a T-type circuit for equivalence.

[0043] Figure 2-1 to Figure 2-3 It is the circuit structure diagram of the converter transformer connected to the 12-pulse rectifier and the inverter under different conduction conditions in embodiment 1, where, diagram 2-1 In the case of Y / Y transformer lower half bridge commutation, Y / △ transformer lower half bridge commutation; Figure 2-2 It is the situation that the Y / △transformer is turned on after the commutation of the upper half bridge of the Y / Y transformer fails. Figure 2-3 This is the case where the lower half bridge of the Y / Y transformer commutates, and the upper half bridge of the Y / △ transformer commutates again after the commutation fails.

[0044] Given rectifie...

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Abstract

The invention provides a transient response analytic calculation method for a high-voltage direct current power transmission system. The method comprises the following steps that: A, a smoothing reactor, a direct current filter and a direct current power transmission circuit of the high-voltage direct current power transmission system are combined with a voltage current relationship to obtain a differential algebraic equation set of the high-voltage direct current power transmission system under different operation work conditions according to a circuit principle; according to the logic relationship of a control system, a differential equation of the control system is built, and a state equation (shown as the accompanying drawing) of the high-voltage direct current power transmission system is finally formed, wherein the differential algebraic equation set is a constant-coefficient nonhomogeneous linear differential equation set, x is the state quantity under the i-th operation work condition, Ai is a state matrix, Bi is an input matrix, the input u(t) is a rectifier-side and inverter-side three-phase voltage instantaneous expression, and Ci is a component after the addition of the control system; B, through the steady state response calculation on the high-voltage direct current power transmission system, the relationship x(t) of the state quantity of the high-voltage direct current power transmission system varying with time and initial values of each operation quantity of the control system are obtained; C, under the alternate current voltage change, the direct current transient response calculation is carried out; and D, the calculation is completed.

Description

Technical field [0001] The invention belongs to the field of power system simulation and calculation, and relates to the transient response calculation of a double-terminal high voltage direct current transmission system based on thyristor control. Background technique [0002] HVDC transmission systems based on thyristor control are generally composed of converter transformers, inverters, filters, smoothing reactors and DC transmission lines. The transient response calculation of the HVDC power transmission system solves the problem of solving the response of the DC system under the changes of the AC side bus voltage amplitude and phase, internal or external system parameters. The invention aims at the response of the current and voltage of the DC system under the condition that the amplitude of the three-phase voltage of the AC bus changes. The transient solution of HVDC transmission is of great significance to the stability analysis and control of the power system. [0003] Du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 赵勇赵利刚李崇涛杜正春林啸夏道止
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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