A Control Method for Suppressing Continuous Commutation Failure in DC Transmission
A technology for commutation failure and DC power transmission, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problems of low low-voltage current limiter starting voltage, increasing DC system control and adjustment time, unfavorable DC system recovery, etc. Achieve the effect of suppressing continuous commutation failure, shortening fault recovery time, and suppressing continuous commutation failure of DC transmission
Inactive Publication Date: 2020-03-24
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.
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[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 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 Error Controller, 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 rectifier side and inverter side after the fault ar...
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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, since the converter devices in the converter station use semi-controlled thyristors, it is impossible to turn them off by controlling the gate, and only rely on the grid voltage to restore the blocking capacity of the thyristors, which leads to commutation failure and becomes a typical fault of DC transmission. With the l...
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IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 李永丽李瑞鹏陈晓龙
Owner TIANJIN UNIV