CN216599017U

CN216599017U - Multi-link SVG power module

Info

Publication number: CN216599017U
Application number: CN202122962651.7U
Authority: CN
Inventors: 周党生; 左冉阳; 黄晓; 胡增山; 梅松林; 杨煜琦; 胡子豪; 雷曾
Original assignee: Shenzhen Hopewind Electric Co Ltd
Current assignee: Shenzhen Hopewind Electric Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-05-24
Anticipated expiration: 2031-11-29

Abstract

The utility model discloses a multi-link SVG power module, which comprises an SVG power module and a bypass switch, wherein the SVG power module is formed by connecting a plurality of H-bridge inverter units in series, and a main contact of the bypass switch is connected with the output end of the SVG power module in parallel; only one H-bridge inverter unit in the SVG power module is connected with a closing coil of the bypass switch; when any one H bridge inverter unit of the multi-link SVG power module fails; the controller of the complete SVG device controls an H bridge inverter unit connected with a closing coil of the bypass switch in the fault SVG power module to control the action of the bypass switch, so that the multi-link SVG power module is integrally bypassed; this multi-link SVG power module carries out bypass control to a plurality of H bridge inverter unit through a bypass switch, has simplified bypass control circuit greatly, has saved the cost, can resume the SVG device operation rapidly behind trouble H bridge inverter unit bypass, has reduced the loss.

Description

Multi-link SVG power module

The technical field is as follows:

the utility model relates to the technical field of static var generators, in particular to a multi-link SVG power module.

Background art:

a Static Var Generator (Static Var Generator SVG) is an inversion compensation device using a fully-controlled power electronic device as a switching device, performs reactive compensation on a load by controlling the on-off time and sequence of the switching device, and has positive significance for improving the stability of a power system and the transmission capability of electric energy.

In an SVG system, a cascade H-bridge structure is usually adopted, when a certain power unit module fails, in order to ensure that the failure is not further enlarged, a sealing wave process is firstly performed, but at this time, the failed module is not disconnected from a main circuit, and a capacitor in the module is still charged, which finally causes the capacitor to be damaged or even explode. Therefore, a fault module and a main circuit are cut by a bypass measure, and normal operation of equipment is ensured without stopping.

The bypass of the fault module through the bypass switch is the most common bypass mode in the current engineering, once the control system detects that the power unit has a fault, the control system immediately sends an instruction to enable the bypass switch to act, the fault module is timely removed, and meanwhile, a modulation instruction sent by the control system is adjusted to ensure that the system quickly recovers to work; in actual SVG equipment, need to control each bypass switch, control circuit is complicated, and the mutual interference that appears easily.

The utility model has the following contents:

the technical problem to be solved by the utility model is to provide a multi-link SVG power module, which performs bypass control on a plurality of H bridge inverter units through a bypass switch, greatly simplifies a bypass control loop, saves cost, can quickly recover the operation of an SVG device after bypassing a fault H bridge inverter unit, and reduces loss.

In order to solve the technical problems, the utility model provides a multi-link SVG power module, which comprises an SVG power module and a bypass switch, wherein the SVG power module is connected with a controller of a complete SVG device; the main contact of the bypass switch is connected with the output end of the SVG power module in parallel; and only one H-bridge inverter unit in the SVG power module is connected with a closing coil of the bypass switch.

Preferably, each H-bridge inverter unit includes an IGBT power module, a driving circuit module, a unit control module, and a switching power supply module.

Preferably, the unit control module further comprises a bypass driving unit for executing a bypass command and controlling the action of the bypass switch.

Preferably, the bypass switch further comprises a bypass state feedback auxiliary contact for detecting a bypass feedback signal.

Preferably, the complete set of SVG devices comprises N SVG power modules, wherein N is more than or equal to 1.

Preferably, the unit control module is used for controlling the operation of the corresponding H-bridge inverter unit and detecting the voltage of the direct-current bus.

Preferably, the unit control module is in communication with a controller of the complete set of SVG device, and is configured to perform feedback of a module running state and receive a control command issued by the controller of the complete set of SVG device.

After the modules are adopted, the multi-link SVG power module comprises an SVG power module and a bypass switch, and the SVG power module is connected with a controller of a complete SVG device; the main contact of the bypass switch is connected with the output end of the SVG power module in parallel; only one H-bridge inverter unit in the SVG power module is connected with a closing coil of the bypass switch; when any one H bridge inverter unit of the multi-link SVG power module fails; the controller of the complete SVG device simultaneously issues bypass instructions to all H-bridge inverter units in the fault SVG power module; the controller of the complete SVG device controls an H bridge inverter unit connected with a closing coil of the bypass switch in the fault SVG power module to control the action of the bypass switch, so that the multi-link SVG power module is integrally bypassed; this multi-link SVG power module carries out bypass control to a plurality of H bridge inverter unit through a bypass switch, has simplified bypass control circuit greatly, has saved the cost, can resume the SVG device operation rapidly after to trouble H bridge inverter unit bypass, has reduced the loss.

Drawings

In order to illustrate the technical solution of the present invention more clearly, the following examples will be described in order to describe the embodiments

The drawings are briefly described as follows:

FIG. 1 is a topological diagram of a multi-link SVG power module of the present invention;

fig. 2 is a flowchart of a bypass control method of a multi-link SVG power module according to the present invention.

Detailed Description

In order to make the objects, features and advantages of the present invention more comprehensible, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples. However, the detailed description and drawings described below are for illustrative purposes only and are not limiting of the utility model. It is intended that the present invention cover only some embodiments of the utility model and not all embodiments of the utility model, and that other embodiments obtained by various modifications of the utility model by those skilled in the art are within the scope of the utility model.

Example one

Referring to fig. 1, the embodiment discloses a multi-link SVG power module, which includes an SVG power module and a bypass switch, wherein the SVG power module is connected to a controller of a complete SVG device, the SVG power module is formed by connecting a plurality of H-bridge inverter units in series, and the H-bridge inverter units are integrally installed in one SVG power module frame; the main contact of the bypass switch is connected with the output end of the SVG power module in parallel; and only one H-bridge inverter unit in the SVG power module is connected with a closing coil of the bypass switch.

Each H-bridge inverter unit comprises an IGBT power module, a driving circuit module, a unit control module and a switch power supply module.

The IGBT power module is used for power conversion, and the driving circuit module is used for providing driving signals for the IGBT power module; the unit control module is used for controlling the operation of the H-bridge inverter unit and detecting the voltage of the direct-current bus, is in communication connection with the controller of the complete SVG device, and is used for feeding back the operation state of the module and receiving a control command sent by the controller of the complete SVG device; the switch power supply module is used for supplying power to the unit control module and the bypass switch.

The unit control module also comprises a bypass driving unit which is used for executing a bypass command and controlling the action of a bypass switch.

The bypass switch also comprises a bypass state feedback auxiliary contact for detecting a bypass feedback signal, when the bypass switch acts, the auxiliary contact is closed, and the fault H-bridge inverter unit detects the fault

And no fault information is uploaded after the bypass state feedback signal is received.

Example two

Referring to fig. 2, the present invention further provides a bypass control method for a multi-link SVG power module, including the following steps:

carrying out fault detection on all multi-link SVG power modules of the complete set of SVG device;

when any one H-bridge inverter unit of the multi-link SVG power module has a fault, the H-bridge inverter unit uploads fault information to a controller of the complete SVG device;

the controller of the complete SVG device locates the position and the fault type of a fault SVG power module, and simultaneously issues bypass instructions to all H-bridge inverter units in the fault SVG power module according to the position and the fault type of the fault SVG power module;

and the controller of the complete SVG device controls the H bridge inverter unit connected with the closing coil of the bypass switch in the fault SVG power module to control the action of the bypass switch, so that the multi-link SVG power module is in a whole bypass.

After the fault multi-link SVG power module successfully bypasses, the H bridge inverter unit detects the bypass state or does not upload the fault state after receiving a bypass instruction, and the bypass module is prevented from triggering the fault again;

the information of the fault H-bridge inverter unit fed back by the unit detection board does not participate in processing calculation any more, so that the effectiveness of fault information processing is ensured;

the controller of the complete SVG device adjusts the wave-generating control quantity of the phase where the bypass module is located, and the consistency of the SVG three-phase port voltage on the amplitude value is ensured.

In summary, the above embodiments are only used for illustration and not for limitation of the utility model, the protection scope of the utility model is not limited to the above embodiments, and modifications or equivalent substitutions on the specific embodiments of the utility model without departing from the technical spirit and scope of the utility model are all within the scope of the claims of the utility model.

Claims

1. A multi-link SVG power module comprises an SVG power module and a bypass switch, wherein the SVG power module is connected with a controller of a complete set of SVG device, and is characterized in that the SVG power module is formed by connecting a plurality of H bridge inversion units in series, and the H bridge inversion units are integrally installed in one SVG power module frame; the main contact of the bypass switch is connected with the output end of the SVG power module in parallel; and only one H-bridge inverter unit in the SVG power module is connected with a closing coil of the bypass switch.

2. The multi-link SVG power module of claim 1, characterized in that each said H-bridge inverter unit comprises an IGBT power module, a driver circuit module, a unit control module and a switching power supply module.

3. The multi-link SVG power module of claim 1, wherein the bypass switch further comprises a bypass state feedback auxiliary contact for detecting a bypass feedback signal.

4. The multi-link SVG power module of claim 1, characterized in that said complete set of SVG devices comprises N SVG power modules, wherein N ≧ 1.

5. The multi-link SVG power module of claim 2, characterized in that said unit control module is used to control the operation of the corresponding H-bridge inverter unit and to detect the DC bus voltage.