Current deviation control optimization method for suppressing direct-current subsequent commutation failure
A technology of current deviation and optimization method, which is applied in the direction of AC network circuit, emergency treatment AC circuit layout, electrical components, etc., to improve the recovery characteristics, improve the recovery characteristics after failure, and improve the resistance to subsequent commutation failures.
Active Publication Date: 2021-11-02
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
Theoretically speaking, the selection and switching of the inverter side control mode can be realized by adjusting the current deviation control output, but there are few literatures to improve the control behavior of the inverter side of the system by optimizing the current deviation control to reduce the risk of subsequent commutation failure
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[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and simulation experiments.
[0027] A current deviation control optimization method for suppressing DC subsequent commutation failure of the present invention is as follows: figure 1 As shown, the specific steps are:
[0028] A. Data collection
[0029] During the operation of the DC transmission system, the following characteristic quantities of the inverter side of the DC transmission system are collected in real time: the leading trigger angle command value β output by the fixed turn-off angle controller cea , Leading trigger angle command value β output by the constant current controller cc , the minimum turn-off angle in a single power frequency cycle γ m , The cut-off angle margin value Δγ output by the current deviation controller cec ; All data collection frequency is the same as f 1 .
[0030] B. Acquisition of additional turn-off angle increment...
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The invention discloses a current deviation control optimization method for suppressing direct current subsequent commutation failure. The method specifically comprises the following steps: acquiring an inversion-side fixed turn-off angle during operation of a direct-current system, an advanced trigger angle instruction output by a fixed current controller, the minimum value of a single power frequency period of the turn-off angle and a current deviation control output value in real time ; judging a magnitude relationship of the advanced trigger angle instruction to obtain a control input enable signal S1, and broadening the control input enable signal S1 to obtain an additional turn-off angle increment input enable signal S2; calculating an extra turn-off angle increment delta gamma t required for promoting the system to return to a fixed turn-off angle control mode again by using the above four real-time data; and when the signal S2 is at a high level, inputting delta gamma t on the basis of original current deviation control output, and optimizing the current deviation control output. According to the invention, time for an inverter side to be in constant current control after a first commutation failure can be effectively shortened, the inverter side is enabled to enter a constant turn-off angle control mode in advance, the turn-off angle is ensured to be continuously controlled, and the direct-current subsequent commutation failure can be effectively avoided.
Description
technical field [0001] The invention belongs to the technical field of current deviation control optimization for high-voltage direct current transmission systems, and in particular relates to a current deviation control optimization method for suppressing subsequent DC commutation failures. Background technique [0002] With the continuous growth of my country's electricity demand, the high voltage direct current transmission system (linecommutated converter high voltage direct current, LCC-HVDC) based on grid commutation and commutation has been widely used due to its advantages such as large transmission capacity, long transmission distance, and fast control response. It is used in long-distance, large-capacity power transmission and power system networking. However, LCC-HVDC has the risk of commutation failure when an AC fault occurs on the inverter side. The first commutation failure generally occurs within 20ms after the fault, and the control system often has no time t...
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IPC IPC(8): H02J3/36H02J3/00
CPCH02J3/36H02J3/001H02J2203/20Y02E60/60
Inventor 林圣钟文梁刘健
Owner SOUTHWEST JIAOTONG UNIV