Method for suppressing subsequent phase commutating failure of 12-pulse inverter of thyristor and system thereof

A commutation failure and inverter technology, applied in the field of power electronics, can solve the problems of DC power recovery, difficulty in restoring voltage stability of the receiving end grid, bipolar outage, etc., to reduce the probability of subsequent commutation failure, It is beneficial to restore the voltage support ability and reduce the consumption of reactive power

Inactive Publication Date: 2017-08-01
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the fault is serious, such as a three-phase short-circuit fault in the vicinity of the 12-pulse inverter, this method will not only fail to reduce the commutation failure, but may also induce the subsequent commutation failure of the 12-pulse inverter. In severe cases, it may cause HVDC unipolar or even bipolar outage
This is because the low-voltage current-limiting control (VDCOL) cannot distinguish the severity of the fault, and restores the DC power with a constant slope. Therefore, when the fault is serious, the DC power rises rapidly, which induces the power grid at the receiving end to be difficult to restore voltage stability, resulting in a 12-pulse inverter. Subsequent commutation failure occurs

Method used

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  • Method for suppressing subsequent phase commutating failure of 12-pulse inverter of thyristor and system thereof
  • Method for suppressing subsequent phase commutating failure of 12-pulse inverter of thyristor and system thereof
  • Method for suppressing subsequent phase commutating failure of 12-pulse inverter of thyristor and system thereof

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Experimental program
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Effect test

Embodiment 1

[0109] Under the condition of DC voltage 500kV, the test results are as follows: Image 6 Shown:

[0110] It can be seen that, using the traditional method, the 12-pulse inverter of the thyristor failed again after the first failure, while using the method shown in the embodiment of the present application, the 12-pulse inverter of the thyristor failed after the first failure. There is no longer a failure.

Embodiment 2

[0112] Under the condition of DC current 3kA, the test results are as follows Figure 7 Shown:

[0113] It can be seen that, using the traditional method, the 12-pulse inverter of the thyristor failed again after the first failure, while using the method shown in the embodiment of the present application, the 12-pulse inverter of the thyristor failed after the first failure. There is no longer a failure.

Embodiment 3

[0115] Under the condition of DC power 1500MW, the test results are as follows Figure 8 Shown:

[0116] It can be seen that, using the traditional method, the 12-pulse inverter of the thyristor failed again after the first failure, while using the method shown in the embodiment of the present application, the 12-pulse inverter of the thyristor failed after the first failure. There is no longer a failure.

[0117] It can be seen that the method shown in the embodiment of the present application reduces the probability of subsequent commutation failure of the 12-pulse inverter.

[0118] It can be known from the above technical solutions that the embodiment of the present application shows a method and system for suppressing subsequent commutation failure of a thyristor 12-pulse inverter. The method includes: obtaining the VDCOL voltage; Enter the high voltage direct current transmission circuit. The method invention shown in the embodiment of the present application makes fu...

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Abstract

The embodiment of the invention provides a method for suppressing subsequent phase commutating failure of a 12-pulse inverter of a thyristor and a system thereof. The method comprises the steps that compensation voltage is acquired; VDCOL voltage is generated according to the compensation voltage and DC voltage; and the VDCOL voltage is inputted to a high voltage DC power transmission circuit. According to the method, the characteristics of difference changes of DC current in the recovery process of an AC-DC system after fault elimination are fully utilized, the VDCOL voltage is acquired firstly, and then the VDCOL voltage is inputted to the high voltage DC power transmission circuit to be led into low voltage current limiting control (VDCOL). The degree of influence on the DC current is the highest, the change rate of the DC current is the highest and the VDCOL voltage is the lowest at the moment of fault elimination, and the recovery rate of the DC current is correspondingly limited at the low level and the recovery speed of the DC power can be reduced so that reactive power consumption of a current converter can be reduced, the receiving end power grid is enabled to recover the voltage support capacity and the probability of subsequent phase commutating failure of the 12-pulse inverter can be reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method and system for suppressing subsequent commutation failure of a thyristor-based 12-pulse inverter. Background technique [0002] The thyristor-based 12-pulse inverter is an important AC-DC power conversion device in the field of power electronics technology, and is widely used in high-voltage direct current (High Voltage Direct Current, HVDC) power transmission, flexible AC power transmission, and new energy grid-connected occasions. HVDC transmission technology has played an extremely important role in the field of power transmission in China, and is mainly used for long-distance high-power transmission and asynchronous networking. However, commutation failure, a common failure of HVDC, has serious consequences. The main consequences include: the sudden increase of DC current makes the current stress of the converter valve too large, the DC bias of the converte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/001H02J3/36Y02E60/60
Inventor 段锐敏郭成李胜男王玲文俊彭俊臻赵泽平覃日升
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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