CN202713137U - Bypass device based on IEGT H bridge power unit - Google Patents

Abstract

The utility model discloses a bypass device based on IEGT H Bridge power units, and the bypass device is designed for a STATCOM topological circuit comprising a plurality of IEGT H bridge power units. The bypass device comprises a plurality of bypass modules, each bypass module is connected with one of the IEGT H bridge power units of the STATCOM topological circuit, the STATCOM topological circuit comprises two parallelly connected STATCOM, each STATCOM is serially connected with a group of IEGT H bridge power units on each phase, each bypass module comprises an electronically-controlled contactor and two thyristors, the electronically-controlled contactor and the two thyristors are parallelly connected between output ends of two phase modules of corresponding IEGT H bridge power unit, and the two thyristors are in inverse-parallel connection.

Description

Bypass device based on IEGTH bridge power unit

technical field

The utility model relates to the technical field of electronic circuits, in particular to a bypass device based on an IEG TH bridge power unit. the

Background technique

IEGT H-bridge power unit is a power unit for STATCOM (Static Synchronous Compensator, Static Var Compensator, STATCOM for short, also known as SVG). In the traditional technology, the bypass module of the IEGTH bridge power unit is mostly a single-function bypass module, such as only bypassing a single power unit, or only realizing a redundant bypass function. In addition, when a power unit fails, the existing bypass module can only bypass it, and cannot start the standby power unit at the same time. the

Utility model content

The utility model proposes a bypass device based on an IEGT H bridge power unit, which can bypass any number of IEGT H bridge power units without being restricted by the voltage phase. the

The utility model is based on the bypass device of the IEGT H bridge power unit, including several bypass modules, each bypass module is connected to an IEGT H bridge power unit in the STATCOM topology circuit,

The STATCOM topology circuit includes two parallel STATCOMs, each STATCOM is connected in series with a group of IEGT H-bridge power units on each phase,

The bypass module includes an electric control contactor and two thyristors, the electric control contactor and the two thyristors are connected in parallel between the output terminals of the two phase modules of the corresponding IEGT H bridge power unit, and the two thyristors are connected in parallel. The thyristors are connected in antiparallel. the

The utility model is based on the bypass device of the IEGT H-bridge power unit, and is designed for a STATCOM topology circuit including several IEGT H-bridge power units. The STATCOM topology circuit has two parallel STATCOMs, and each phase of each STATCOM Connect a group of IEGT H-bridge power units in series. In order to bypass any number of IEGT H-bridge power units in any phase, a bypass module is connected to each IEGT H-bridge power unit. In addition, in order to realize the redundant bypass function, some IEGT H bridge power units are used for backup on each phase. When the normal working IEGT H bridge power unit fails, use its corresponding bypass module to disable it , while using the corresponding bypass module to enable the backup IEGT H-bridge power unit. the

Description of drawings

Figure 1 is a schematic diagram of the 35kV±320Mvar STATCOM dual-machine parallel topology circuit;

Figure 2 is the structural layout of the 35kV±320Mvar STATCOM dual-machine parallel IEGT H-bridge power unit container;

Fig. 3 is the logical block diagram of the bypass module and the IEGTH bridge power unit of the bypass device based on the IEGTH bridge power unit of the utility model;

Fig. 4 is the circuit schematic diagram of the bypass module and the IEGTH bridge power unit of the bypass device of the utility model based on the IEGTH bridge power unit;

Figure 5 is a schematic diagram of the state of the bypass module under the normal operation of the IEGT H-bridge power unit;

Figure 6 is a schematic diagram of the state of the bypass module in the case of a fault in the IEGT H-bridge power unit;

Figure 7 is a schematic diagram of the simultaneous bypass of the three-phase valve group unit;

Figure 8 is a schematic diagram of simultaneous bypass of single-phase valve group unit;

Figure 9 is a schematic diagram of a single valve group unit bypass. the

Detailed ways

Explain the utility model in detail below in conjunction with accompanying drawing. the

The utility model is based on the bypass device of the IEGT H-bridge power unit, and is designed for the IEGT H-bridge power unit in the STATCOM topology circuit. As shown in Figure 1, the STATCOM topology circuit includes two parallel STATCOMs, and a group of IEGT H-bridge power units are connected in series on each phase of each STATCOM. The specific number of a group of IEGT H-bridge power units depends on the needs, preferably 26 as shown in Figure 1: A1, A2, A3..., A26. Figure 2 shows the layout of the container structure of the STATCOM dual-machine parallel IEGT H-bridge power unit. the

In order to bypass any number of IEGT H-bridge power units in any phase, a bypass module is connected to each IEGT H-bridge power unit. Figure 7 is a schematic diagram of simultaneous bypass of three-phase valve group units, Figure 8 is a schematic diagram of simultaneous bypass of single-phase valve group units, and Figure 9 is a schematic diagram of single-phase valve group unit bypass. the

Figure 3 shows a schematic diagram of the modular relationship between the bypass module and the IEGT H-bridge power unit, and Figure 4 shows the specific circuit diagram of the bypass module and the IEGT H-bridge power unit. It can be seen from Fig. 4 that the bypass circuit includes the electric control contactor KM and two thyristors SCR1 and SCR2, and the electric control contactor KM and the two thyristors SCR1 and SCR2 are connected in parallel to the two phase modules of the corresponding IEGT H bridge power unit Between the output ends of the thyristors, and the two thyristors SCR1 and SCR2 are connected in antiparallel. When the IEGT H-bridge power unit is working normally, as shown in Figure 5, the electric control contactor corresponding to the bypass module is disconnected; when the IEGT H-bridge power unit fails, as shown in Figure 6, the IEGT H-bridge The power unit controls the electrical control contactor of the corresponding bypass module to close. the

In order to realize the redundant bypass function, there are some 2-3 IEGT H-bridge power units on each phase of STATCOM for backup. Under normal circumstances, the electric control contactor of the bypass module connected to the IEGT H-bridge power unit used for backup is closed, and the IEGT H-bridge power unit does not work. When a certain IEGT H-bridge power unit on this phase fails When the faulty IEGT H-bridge power unit is bypassed, the electric control contactor of the bypass module connected to the IEGT H-bridge power unit used for backup turns from closed to open, and the IEGTH bridge power unit used for backup starts to work . the

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims. the

Claims (2)

1. a bypass device based on IEGT H bridge power unit, it is characterized in that, comprises several bypass modules, each bypass module connects an IEGT H bridge power unit in the STATCOM topological circuit, The STATCOM topology circuit includes two parallel STATCOMs, each STATCOM is connected in series with a group of IEGT H-bridge power units on each phase, The bypass module includes an electric control contactor and two thyristors, the electric control contactor and the two thyristors are connected in parallel between the output terminals of the two phase modules of the corresponding IEGT H bridge power unit, and the two thyristors are connected in parallel. The thyristors are connected in antiparallel. 2. The bypass device based on IEGT H bridge power unit according to claim 1, characterized in that 2 or 3 IEGT H bridge power units on the same phase are used for backup, and the IEGT H bridge power unit in work fails , the electric control contactor controlling the bypass device connected to it turns from open to close, and the IEGT H bridge power unit used for backup controls the electric control contactor of the bypass module connected to turn from closed to open.

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