Method and system for estimating commutation failure prevention effect of synchronous phase modulation machine on line-commutator-converter high voltage direct current (LCC-HVDC)

An LCC-HVDC, commutation failure technology, applied in the field of DC power transmission, can solve the problems of lack of resistance to commutation failure indicators, lack of resistance to commutation failure, etc., to achieve intuitive effects, easy operation, and strong feasibility Effect

Active Publication Date: 2018-09-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

[0005] In order to solve the above-mentioned prior art lack of an index with practical engineering significance to measure the LCC-HVDC system's ability to resist commutation failure, the purpose of the present invention is to provide a method for evaluating the inhibition effect of synchronous condensers on LCC-HVDC commutation failure The method and system solve the problem of the lack of indicators with practical engineering significance to measure the resistance of LCC-HVDC systems to commutation failures

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  • Method and system for estimating commutation failure prevention effect of synchronous phase modulation machine on line-commutator-converter high voltage direct current (LCC-HVDC)
  • Method and system for estimating commutation failure prevention effect of synchronous phase modulation machine on line-commutator-converter high voltage direct current (LCC-HVDC)
  • Method and system for estimating commutation failure prevention effect of synchronous phase modulation machine on line-commutator-converter high voltage direct current (LCC-HVDC)

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Embodiment 1

[0051] The present invention provides a method for quantitatively evaluating the effect of a synchronous condenser on the inhibition of LCC-HVDC commutation failure, said method comprising the following steps, the flow chart of which is as follows figure 2 Shown:

[0052] 1) First, the initial short-circuit ratio SCR of the AC system on the inverter side of the DC system is obtained by calculation initial ;

[0053] 2) Keep the initial short-circuit ratio of the AC system on the inverter side unchanged in 1), put in a synchronous condenser, and obtain the fault inductance L that makes the commutation failure probability (CFPI) of the LCC-HVDC system m% CFPIm ;

[0054] 3) Cut off the synchronous condenser and set the fault inductance value to L CFPIm , adjust the short-circuit ratio of the AC system on the inverter side, and obtain the system short-circuit ratio SCR when the commutation failure probability of the DC transmission system is m% at this fault level new ;

[...

Embodiment 2

[0068] This embodiment simulates and studies the effect of suppressing LCC-HVDC commutation failure when a synchronous condenser is put into the bus on the inverter side of the system. The system structure is as follows figure 1 As shown in , a synchronous condenser is connected to the busbar on the inverter side of the LCC-HVDC system. The steps of the proposed method are described in detail below:

[0069] 1) Before the synchronous condenser is put into use, the short-circuit ratio SCR of the AC system on the inverter side of the DC system is calculated to be 3, that is, the SCR initial = 3;

[0070] 2) Keep the short-circuit ratio of the AC system on the inverter side unchanged in 1), and put in a synchronous condenser. Through simulation, it can be obtained that the fault inductance when the commutation failure probability is equal to 0 under this operating condition is 0.98H, that is, m% = 0%, L CFPI0 =0.98H;

[0071] 3) Cut off the synchronous condenser, keep the fau...

Embodiment 3

[0075] Based on the same inventive concept, the present invention also provides a system for evaluating the inhibition effect of synchronous condensers on LCC-HVDC commutation failure, which is characterized in that:

[0076] The first calculation module is used to calculate the initial short-circuit ratio of the AC system on the inverter side of the DC system; input the synchronous condenser, keep the initial short-circuit ratio of the AC system on the inverter side of the DC system unchanged, and obtain the commutation failure probability of the LCC-HVDC system is the fault inductance value of the LCC-HVDC system when m;

[0077] The simulation module is used to remove the synchronous condenser, keep the fault inductance value unchanged, and calculate the short-circuit ratio after the change of the AC system on the inverter side of the DC system when the commutation failure probability of the LCC-HVDC system is m;

[0078] The second calculation module is used to calculate t...

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Abstract

The invention relates to a method and system for estimating a commutation failure prevention effect of a synchronous phase modulation machine on line-commutator-converter high voltage direct current (LCC-HVDC). The method comprises the steps of calculating an initial short-circuit ratio of an AC system at an inversion side of a DC system; maintaining the initial short-circuit ratio of the AC system at the inversion side unchanged, putting to the synchronous phase modulation machine, and performing simulation to obtain a preset fault inductance value corresponding to commutation phase failure probability of an LCC-HVDC system; removing the synchronous phase modulation machine under the corresponding preset fault inductance value, and calculating the changed short-circuit ratio of the AC system at the inversion side of the DC system; and performing calculation to obtain commutation failure probability-based short-circuit increment according to the initial short-circuit ratio and the changed short-circuit ratio. With the method provided by the technical scheme, the problem of shortage of an index measuring commutation failure prevention capability of the LCC-HVDC system and having actual engineering significance is solved.

Description

technical field [0001] The invention relates to the field of direct current transmission, in particular to a method-level system for evaluating the suppression effect of a synchronous condenser on LCC-HVDC commutation failure. Background technique [0002] Since the 1950s, line-commutated-converter high-voltage direct current (LCC-HVDC) has gained worldwide popularity due to its advantages in long-distance large-capacity power transmission, cross-strait power transmission, and interconnection of AC systems. Has been widely used. However, since the LCC-HVDC system uses thyristors without self-shutoff capability as commutation components, a certain strength of AC system is required to provide commutation voltage, which is prone to commutation failure. [0003] As a rotating device, synchronous condensers can provide short-circuit capacity for the system and have better overload capacity compared with dynamic reactive power compensation devices based on power electronics techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/18
CPCH02J3/1885H02J3/36Y02E40/30Y02E60/60
Inventor 郭春义杨硕赵成勇杨治中王庆杨鹏程
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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