| 摘要 |
A hybrid high-voltage DC breaker, consists of a plurality of completely identical breaker modules connected in series. Each of the breaker modules comprises a main current circuit, a transfer current circuit, an over-voltage limiting circuit and a control system, wherein a high-speed mechanical switch, the transfer current circuit and the over-voltage limiting circuit are connected in parallel. The transfer current circuit consists of circuits 1-4, wherein the circuit 1 and the circuit 4 are connected in series at first and then connected with the main current circuit in parallel; a pre-charged capacitor is connected with the circuit 4 in parallel after being connected with the circuit 3 in series; and, one end of the circuit 2 is connected with the left end of the main current circuit while the other end thereof is connected with a connection point of the pre-charged capacitor and the circuit 3. |
| 主权项 |
1. A hybrid high-voltage DC breaker, consisting of n completely identical breaker modules, all of which are connected in series and the modules number is from 1 to n, S1-Sn+1 are n+1 system access terminals for the breaker modules, wherein each of the breaker modules comprises a main current circuit, a transfer current circuit, an over-voltage limiting circuit, a control system, and access terminals Si and Si+1 of the system, where 1≦i≦n, and the main current circuit, the transfer current circuit and the over-voltage limiting circuit are connected in parallel, wherein:
(1) the main current circuit consists of a high-speed mechanical switch and a power semiconductor device A0, which are connected in series, wherein:
the access terminal Si is connected with one end of the high-speed mechanical switch to realize the connection of the access terminal Si with one end of the main current circuit;the other end of the high-speed mechanical switch is connected with one end of the power semiconductor device A0; andthe other end of the power semiconductor device A0 is connected with the access terminal Si+1 to realize the connection of the access terminal Si+1 with the other end of the main current circuit; (2) the transfer current circuit comprises a circuit 1 consisting of a power semiconductor device A1, a circuit 2 consisting of an inductor L_0 and a power semiconductor device A2 connected in series, a circuit 3 consisting of an inductor L_1 and a power semiconductor device A3 connected in series, a circuit 4 consisting of a power semiconductor device A4, and a pre-charged capacitor C pre-charged with a certain voltage, the circuit 1 being connected with the circuit 4 in series, the circuit 2 being connected with the circuit 3 in series, wherein:
(A) the circuit 1 is connected with the circuit 4 in series to form a branch 14 of the transfer current circuit, and the branch 14 is connected with the main current circuit in parallel, furthermore:
the access terminal Si is connected with one end of the power semiconductor device A1 to realize the connection with one end of the branch 14;the other end of the power semiconductor device A1 is connected with one end of the power semiconductor device A4 to realize the connection in series of the circuit 1 with the circuit 4; andthe other end of the power semiconductor device A4 is connected with the access terminal S2 to realize the connection of the other end of the branch 14 with the access terminal S2, in order to realize the connection in parallel of the branch 14 with the main current circuit;(B) the circuit 2 is connected with the circuit 3 in series to form a branch 23 of the transfer current circuit, and the branch 23 is connected with the main current circuit in parallel, furthermore:
the access terminal Si is connected with one end of the inductor L_0 to realize connection with one end of the branch 23;the other end of the inductor L_0 is connected with one end of the power semiconductor device A2;the other end of the power semiconductor device A2 is connected with one end of the inductor L_1 to realize the connection in series of the circuit 2 with the circuit 3;the other end of the inductor L_1 is connected with one end of the power semiconductor device A3; andthe other end of the power semiconductor device A3 is connected with the access terminal S2 to realize the connection of the other end of the branch 23 with the access terminal Si+1, in order to realize the connection in parallel of the branch 23 with the main current circuit; and(C) the pre-charged capacitor C is connected between an endpoint between the circuit 1 and the circuit 4 and an endpoint between the circuit 2 and the circuit 3; and (3) the control system measures the current flowing through the access terminal Si or Si+1, the current flowing through the main current circuit, the current flowing through the circuit 1 in the transfer current circuit, the current flowing through the over-voltage limiting circuit, the voltage at two ends of the high-speed mechanical switch and the displacement of the high-speed mechanical switch, and controls the high-speed mechanical switch and the power semiconductor devices A1-A4 in the transfer current circuit to act by measuring the current amplitude and current rate of change of the main current circuit and the current amplitude and current rate of change of the circuit 1 in the transfer current circuit. |
