A current-limiting type fast reclosing DC circuit breaker topology structure and control method
A DC circuit breaker and topological structure technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of accelerating the discharge speed of inductance energy on the fault side, high cost, etc., to reduce the peak value, slow down the rising speed, and reduce the withstand current The effect of pressure
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Example Embodiment
[0050] Example 1
[0051] figure 1 It is the topological structure diagram of the current limiting fast reclosing DC circuit breaker proposed by the present invention, including the following five parts:
[0052] ① Current-carrying circuit; composed of fast mechanical switch and auxiliary commutation switch;
[0053] ②Current-limiting circuit; it includes two sections of inductors of equal size, which are connected in series on both sides of the current-carrying circuit;
[0054] ③Converter circuit; also known as diode bridge commutator circuit, which is connected in parallel with the current-carrying circuit, including four diode bridge arms and two damping resistors;
[0055] ④ Current-breaking circuit; connected in series between the upper and lower bridge arms of the commutator circuit, including the power electronic branch and the arrester branch;
[0056] ⑤ Freewheeling circuit; connected in series between the lower bridge arm of the commutation branch and the ground,...
Example Embodiment
[0058] Embodiment 2
[0059] The DC circuit breaker disclosed in Example 1 is placed in a single-ended DC transmission line for research. Assuming that a ground fault occurs on the right side of the DC circuit breaker, L 1 is the non-fault side inductance, L 2 is the fault-side inductance. figure 2 is the specific sequence diagram of the circuit breaker action, combined with figure 2 , the specific action sequence of fault breaking is described as follows:
[0060] t=t 0 When the ground fault occurs in the circuit on the right side of the DC circuit breaker;
[0061] t=t 1 When the protection device detects the occurrence of the fault, the circuit breaker receives the action signal; the DC circuit breaker disconnects the auxiliary converter switch of the current-carrying circuit and closes the power electronic branch of the current-breaking branch at the same time. 1 , turn on all the IGBTs in the SM; the current is gradually commutated from the current-carrying circui...
Example Embodiment
[0073] Embodiment 3: Reclosing
[0074] combine figure 2 Describe the operation sequence of the circuit breaker proposed by the present invention when reclosing:
[0075] Suppose the fault is at t = t 5 When it is successfully cut off, after a short delay, it starts to reclose;
[0076] t=t 6 , close the power electronics branch, i.e. turn on all the IGBTs in the SM; the current will rise again
[0077] t=t 7 When the fault occurs, the electrical quantity of the fault circuit is detected to determine whether the fault still exists; for example, the current rise rate di / dt is detected, and if it exceeds the preset threshold, it means that the fault still exists, then all IGBTs in the SM are blocked, and the reclosing fails; If it is lower than the preset threshold, indicating that the fault has been removed, a conduction signal will be sent to the fast mechanical switch, and the next steps will be performed;
[0078] t=t 8 When the fast mechanical switch is closed, the ...
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