| 摘要 |
A converter bridge arm suitable for high-voltage applications and an application system thereof. The converter bridge arm comprises an energy storage capacitor (C) and a plurality of reverse-conducting switches, and is formed by serial connection of an upper telescopic arm (Bu), a lower telescopic arm (Bd) and an inductor (Lb). The upper telescopic arm (Bu) and the lower telescopic arm (Bd) are respectively formed by cascading connection of a plurality of units. The converter bridge arm has a simple modular structure, is easy to control, reliable and convenient for starting a high-voltage circuit, has self-balancing voltage sharing effect, and can operate without a transformer and has the characteristic of power bidirectional flow, does not require high-voltage isolation auxiliary power supply, has the advantages of suitability for high-frequency operation and electromagnetic compatibility, and can remarkably reduce the dimension of a filter. |
| 主权项 |
1. A converter bridge arm suitable for high-voltage applications, which includes an energy storage capacitor C and a plurality of reverse conducting switches; wherein, the converter bridge arm is formed by series connection of an upper telescopic arm Bu, a lower telescopic arm Bd and an inductor(s) Lb, wherein the upper telescopic arm Bu and the lower telescopic arm Bd are respectively formed by cascading connection of a plurality of symmetrical units;
The symmetrical unit is composed of a first switch K1, a second switch K2, a third switch K3, a fourth switch K4 and an energy storage capacitor C; wherein, the first switch K1 and the second switch K2 as well as the third switch K3 and the fourth switch K4 are connected in series respectively; the positive terminal of the first switch K1 is connected with the positive terminal of the third switch K3 to serve as a positive terminal p* of the unit, and the negative terminal of the second switch K2 is connected with the negative terminal of the fourth switch K4 to serve as a negative terminal n* of the unit; the energy storage capacitor C is connected between the positive terminal p* and the negative terminal n*; the junction between the first switch K1 and the second switch K2 is a second cascading connection terminal Z12 of the unit, and the junction between the third switch K3 and the fourth switch K4 is a fourth cascading connection terminal Z22 of the unit; The cascading connection mode of the plurality of symmetrical units is as follows: between two adjacent units, the fourth cascading connection terminal Z22 of the former unit is connected with the second cascading connection terminal Z 12 of the latter unit; The upper and lower terminals of the bridge arm are terminals P and N of the bridge arm, respectively; In the units at the outer sides of the two ends of the upper telescopic arm Bu and the lower telescopic arm Bd, the positive terminals p* and the negative terminals n* are led out to serve as auxiliary terminals of the converter bridge arm; the second cascading connection terminal Z12 is taken as terminal p and the fourth cascading connection terminal Z22 is taken as terminal n, and the terminals p and n are arranged in a direction consistent with the terminals P and N of the converter bridge arm; The neutral point of the bridge arm, i.e. terminal Ac, is led from the connection wire between the terminal n of the upper telescopic arm Bu and the terminal p of the lower telescopic arm Bd; and the inductor(s) Lb is(are) any of the following forms: (1) There is one inductor Lb, which is located at any position of the series connection branch of the upper telescopic arm Bu and the lower telescopic arm Bd; (2) There are two inductors Lb, which are respectively located at the two sides of the terminal Ac on the series connection branch of the upper telescopic arm Bu and the lower telescopic arm Bd; and (3) There are a plurality of inductors Lb, which are respectively located in the various symmetrical units. |
