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Direct-current transmission converter valve open phase step circuit and open phase step current determination method

A technology of direct current transmission and step current, which is applied in the direction of output power conversion devices and electrical components, and can solve the problems of poor ability and limitation of thyristors to withstand step current

Active Publication Date: 2013-08-21
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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Problems solved by technology

[0004] From the above analysis, it can be seen that the turn-on step current is inevitable, but since the ability of the thyristor to withstand the step current is poor at the beginning of turn-on, this current needs to be strictly limited

Method used

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  • Direct-current transmission converter valve open phase step circuit and open phase step current determination method
  • Direct-current transmission converter valve open phase step circuit and open phase step current determination method
  • Direct-current transmission converter valve open phase step circuit and open phase step current determination method

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Embodiment Construction

[0043]The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] The invention provides a DC transmission converter valve opening step circuit, the schematic diagram is as follows Figure 4 shown, including stray capacitance C s , Converter transformer leakage inductance L μ , Power U s , valve arrester R a , saturated reactor SR, valve damping capacitor C d and the valve damping resistor R d ;

[0045] Stray capacitance C s Both ends respectively pass through the leakage inductance L of the converter transformer μ Connect to power supply U s The positive and negative poles of the saturable reactor SR and the thyristor T are connected in series to form a series branch of the saturated reactor SR-thyristor T; the stray capacitance C s , valve arrester R a It is connected in parallel with the series branch of the saturated reactor SR-thyristor T; the valve damping capaci...

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Abstract

The invention relates to the field of direct-current transmission, in particular to a direct-current transmission converter valve open phase step circuit and an open phase step current determination method. The circuit comprises a stray capacitor Cs, a converter transformer leakage inductor Lmu, a power supply Us, a valve arrester Ra, a saturation resistor SR, a valve damping capacitor Cd and a valve damping resistor Rd. The determination method comprises the following steps of modeling the saturation resistor SR, a thyristor T and the valve arrester Ra in a non-linear mode, confirming the energy transfer relation of the converter valve open phase step circuit, analyzing a converter valve open initial state, simplifying the open phase step circuit, confirming the function relationship between phase step current and open phase step circuit parameters, optimizing system conditions and improving phase step current. An open instant energy transfer process is analyzed, the mathematic relation between the phase step current and the system parameters is built, and accordingly the open phase step current determination method which can correct to the ampere level is formed.

Description

technical field [0001] The invention relates to the field of direct current transmission, in particular to a step circuit for opening a converter valve of direct current transmission and a method for determining the step current for opening. Background technique [0002] HVDC transmission technology is widely used in modern power systems. During operation, the stray capacitance of the converter transformer system (C s ) is equivalent to being connected in parallel at both ends of the converter valve, and will be charged during the shut-off phase of the converter valve, thereby storing a large amount of energy; in addition, a large current will also be established in the valve arrester due to limiting transient or impulse overvoltage. During the opening of the converter valve, the energy will be transferred to the series circuit of the thyristor and the saturable reactor, resulting in an opening surge current, which is called step current (denoted as i step ),Such as figur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/06
Inventor 魏晓光刘杰于海玉曹均正郭焕
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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