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DC power control method inhibition multi-feed-in DC commutation failure

A multi-infeed DC, commutation failure technology, applied in reactive power compensation, AC network circuit, AC network voltage adjustment, etc., can solve the problem of system transmission power drop, failure to consider successive commutation failures, poor economic efficiency of auxiliary equipment, etc. problem, to achieve the effect of fast and accurate control, convenient realization and fast control speed

Active Publication Date: 2018-10-23
SICHUAN UNIV
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  • Application Information

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Problems solved by technology

[0059] However, the above method only performs reactive power compensation to suppress the commutation failure of the system from the prevention control of commutation failure and the post-commutation failure, which will cause a large drop in the transmission power of the faulty system, which is not conducive to system stability; and the auxiliary equipment for reactive power compensation The economy is poor, and the recovery process is complicated, the recovery time is slow, and the situation of successive commutation failures is not considered

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  • DC power control method inhibition multi-feed-in DC commutation failure
  • DC power control method inhibition multi-feed-in DC commutation failure
  • DC power control method inhibition multi-feed-in DC commutation failure

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Embodiment Construction

[0105] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0106] 1) build figure 1 The simplified model of the multi-infeed DC transmission system is shown. Two circuits of DC transmission lines are respectively fed into the receiving end system via BUS2 and BUS3, and there are two circuits of AC transmission system. The receiving end is the three-zone AC system, through the connection line L tie12 and L tie23 Coupled up. The receiving system includes generator G s1 , G s2 and G s3 , the AC system buses BUS1, BUS2 and BUS3 are respectively hung with loads Load1, Load2 and Load3. figure 1 middle, y N1 ,y N2 ,y N3 is the equivalent admittance corresponding to the connecting line of the generator at the sending end; E 1 ,E 2 ,E 3 ,E s1 ,E s2 ,E s3 is the equivalent electromotive force corresponding to the generator; U ac1 , U ac2 , U ac3 is the effective value of the bus line...

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Abstract

The invention discloses a DC power control method inhibition multi-feed-in DC commutation failure. A simplified model of a multi-feed-in DC power transmission system is established, start of DC powercontrol is determined on the basis of sin-cos component detection method, further the DC power adjustment amount and DC power control rate are determined, and DC power control in different commutationfailure scenes is carried out according to the DC power adjustment amount and DC power control rate. The control method is high in control speed, accurate, convenient to realize, good in control effect and high in economic performance, does not need wide area measurement data or extra investment, and does not interfere operation of other equipment.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a direct current power control method for suppressing multi-infeed direct current commutation failures. Background technique [0002] Commutation failure is one of the most likely faults in DC transmission systems. In the converter, if the valve that exits conduction fails to recover the blocking ability during a period of time when the reverse voltage is applied, or the commutation process is not completed during the reverse voltage, when the valve voltage becomes positive, The commutated valve will commutate to the valve originally scheduled to withdraw from conduction. This situation is called commutation failure. [0003] The main reason for the commutation failure is that the AC system failure causes the commutation bus voltage on the inverter side to drop. Under certain conditions, some commutation failures can be automatically recovered, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36H02J2203/20Y02E40/30Y02E60/60
Inventor 刘天琪印月江琴李保宏曾雪洋张英敏曾琦
Owner SICHUAN UNIV
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