Switching-on logic optimization method for switch in converter transformer incoming line
A logic optimization and commutation technology, applied in electrical components, circuit devices, etc., can solve the problem of difficult switching and closing of pole-controlled sequential logic
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specific Embodiment 1
[0039] The application provides a method for optimizing the switch closing logic in the incoming line of a converter transformer, including:
[0040] The command to close the incoming line switch is sent to the middle switch, and it is judged whether the closing permission state of the middle switch is 1, and judging whether the closing permission state of the middle switch is 1 includes judging whether the pole control system receives the ESOF signal. The ESOF signal comes from the DC emergency shutdown control, which is the highest level of control. Generally, the ESOF control can be activated by the protection action or manual operation. When a fault occurs in the converter or the entire DC system, the extreme control system will receive the ESOF signal.
[0041] If the extreme control system does not receive the ESOF signal, after a preset time delay, the middle switch closing permission state is 1. The preset time depends on the operating conditions of the system.
[00...
specific Embodiment 2
[0046] On the basis of the specific embodiment 1, judging whether the switch-on permission state of the middle switch is 1 also includes judging whether the converter transformer protection trip tripping-in state is 0:
[0047] Before the judgment of whether the extreme control system receives the ESOF signal, it is first judged whether the three-trip input state of the converter transformer protection trip is 0, and if the three-trip input state of the converter transformer protection trip is 0, then the pole control system is judged Whether the system receives the ESOF signal.
[0048] That is to say, two logic judgment conditions are added on the basis of the existing closing logic: one is to judge whether the three-trip input state of the transformer protection trip is 1, and the other is to judge whether the pole control system receives the ESOF signal.
[0049] The command to close the incoming line switch is sent to the middle switch. When the input status of the three tr...
specific Embodiment 3
[0053] On the basis of the second embodiment, judging whether the closing permission state of the middle switch is 1 also includes judging whether the side switch closing state is 1.
[0054] The side switch closing process includes:
[0055] The command to close the incoming line switch is sent to the side switch, and it is judged whether the closing allowable state of the side switch is 1, and judging whether the closing allowable state of the side switch is 1 includes judging that the side switch is in the fault-free and open state. Whether the gate state is 1;
[0056] If the side switch is fault-free and the opening state is 1, that is, the closing allowable state of the side switch is 1, then judge whether the synchronization of the interface device is qualified;
[0057] If the synchronization check of the interface device is qualified, it is judged whether the phase selection of the phase selection closing device is successful;
[0058] If the phase selection of the ...
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