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Control method for preventing continuous commutation failure of DC power transmission

A technology of commutation failure and direct current transmission, applied in the direction of direct current network circuit devices, electrical components, circuit devices, etc., can solve the problems of low starting voltage of low voltage current limiter, increase of control and adjustment time of direct current system, unfavorable recovery of direct current system, etc. Achieve the effects of suppressing continuous commutation failure, shortening fault recovery time, and suppressing continuous commutation failure of DC transmission

Inactive Publication Date: 2017-10-31
TIANJIN UNIV
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Problems solved by technology

However, the DC current is no longer equal to the rated value in the fault steady state, and the voltage drop on the virtual resistance will always exist, which will cause the starting voltage of the low-voltage current limiter to be low. It increases the control and adjustment time of the DC system after the system failure, which is not conducive to the recovery of the DC system after the failure.

Method used

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  • Control method for preventing continuous commutation failure of DC power transmission
  • Control method for preventing continuous commutation failure of DC power transmission
  • Control method for preventing continuous commutation failure of DC power transmission

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] (1) by figure 1 It can be seen that the rectifier side of the DC system is equipped with a min The limited constant current controller, the inverter side is equipped with a constant current controller and a constant turn-off angle controller. In addition, the inverter side is also equipped with a current error controller (Current ErrorControllor, CEC), which can realize the smooth switching from constant turn-off angle control to constant current control on the inverter side. I des Generally take 1p.u, which is greater than the output current command I of the low-voltage current limiter during a fault, so the current commands of the constant current controllers on the rectification side and inverter side after the f...

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Abstract

The invention relates to a control method for preventing continuous commutation failure of DC power transmission. A line voltage effective value of a conversion bus at an inversion side is acquired by a three-phase voltage inductor, and a current of a DC system at the inversion side is acquired by a DC current sensor. The change conditions of a DC current and the conversion bus voltage after a fault are considered, meanwhile, the effect of a DC system control link after the fault is considered, a starting voltage value of a low-voltage current limiter is calculated, and the control method is used for preventing continuous commutation failure of DC power transmission caused by abrupt change of the starting voltage of the low-voltage current limiter.

Description

technical field [0001] The invention relates to a control method for suppressing continuous commutation failure of direct current transmission. Background technique [0002] DC transmission has the advantages of large transmission power, fast and controllable power, and low transmission loss. It is widely used in occasions such as long-distance transmission across large regions and interconnection of asynchronous grids. The energy development strategy of "internetwork" plays a very important role, effectively solving the problem of reverse distribution of energy centers and load centers in my country, and bringing huge economic and social benefits. However, because the converter device in the converter station uses a semi-controlled device thyristor, it cannot be turned off by controlling the gate, and the blocking ability of the thyristor can only be restored by the grid voltage, which leads to commutation failure and becomes a typical fault of DC transmission. With a large...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 李永丽李瑞鹏陈晓龙
Owner TIANJIN UNIV
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