阅读说明：本技术 柔直输电igct-mmc子模块的冗余供电系统及方法 (Flexible direct power transmission IGCT-MMC sub-module redundant power supply system and method ) 是由 刘琦 王小康 宋双祥 梁晓文 孙小平 娄彦涛 于 2021-08-12 设计创作，主要内容包括：一种柔直输电IGCT-MMC子模块的冗余供电系统及方法,冗余供电系统包括高位取能电源、就地控制器、旁路开关控制器以及IGCT驱动器；所述的高位取能电源包括输入滤波模块,并列与输入滤波模块相连的若干个第一级反激电路单元,以及连接在每一个第一级反激电路单元上的第二级低压单元；所述的就地控制器和旁路开关控制器上均冗余设置有若干个电源模块,每个第二级低压单元与每个电源模块一一对应连接；所述的每个第一级反激电路单元分别连接一个IGCT驱动器；所述的就地控制器向旁路开关控制器发送旁路指令,旁路开关控制器实现子模块的旁路和切除。本发明能够降低高位取能电源体积、重量和成本,且可靠性高,易于实现。(A redundant power supply system and method of flexible direct power transmission IGCT-MMC submodule, the redundant power supply system includes the high-order energy taking power, local controller, bypass switch controller and IGCT driver; the high-order energy-taking power supply comprises an input filtering module, a plurality of first-stage flyback circuit units connected with the input filtering module in parallel and a second-stage low-voltage unit connected to each first-stage flyback circuit unit; the local controller and the bypass switch controller are respectively provided with a plurality of power supply modules in a redundant manner, and each second-stage low-voltage unit is connected with each power supply module in a one-to-one correspondence manner; each first-stage flyback circuit unit is connected with an IGCT driver respectively; the local controller sends a bypass instruction to the bypass switch controller, and the bypass switch controller realizes bypass and cutting of the sub-module. The invention can reduce the volume, the weight and the cost of the high-order energy-taking power supply, has high reliability and is easy to realize.)

1. The utility model provides a gentle redundant power supply system who directly transmits electricity IGCT-MMC submodule piece which characterized in that: the system comprises a high-level energy-taking power supply (1), a local controller (2), a bypass switch controller (3) and an IGCT driver (4); the high-order energy-taking power supply (1) comprises an input filtering module (11), a plurality of first-stage flyback circuit units (12) connected with the input filtering module (11) in parallel, and second-stage low-voltage units (13) connected to each first-stage flyback circuit unit (12); the local controller (2) and the bypass switch controller (3) are respectively provided with a plurality of power supply modules (5) in a redundant manner, and each second-stage low-voltage unit (13) is correspondingly connected with each power supply module (5); each first-stage flyback circuit unit (12) is connected with an IGCT driver (4) respectively; the local controller (2) sends a bypass instruction to the bypass switch controller (3), and the bypass switch controller (3) realizes bypass and cutting off of the sub-modules.

2. The redundant power supply system of gentle straight power transmission IGCT-MMC submodule piece of claim 1 characterized in that: the high-order energy-taking power supply (1) further comprises a plurality of power supply detection units (14), each first-stage flyback circuit unit (12) is connected with a second-stage low-voltage unit (13) connected to the first-stage flyback circuit unit, each power supply detection unit (14) collects power supply fault detection signals and sends the signals to the local controller (2) respectively.

3. The redundant power supply system of gentle straight power transmission IGCT-MMC submodule piece of claim 1 characterized in that: and the power supply modules (5) on the local controller (2) and the bypass switch controller (3) have the input voltage detection function.

4. The redundant power supply system of gentle straight power transmission IGCT-MMC submodule piece of claim 3 characterized in that: and the bypass switch controller (3) sends an alarm signal to the local controller (2) through an optical cable when the power supply fails.

5. The redundant power supply system of gentle straight power transmission IGCT-MMC submodule piece of claim 4 characterized in that: the local controller (2) judges the type of the power failure and the threat degree thereof according to the input voltage detection result of the internal power module (5) and by combining the power output of the high-order energy-taking power supply (1) and the alarm signal sent by the bypass switch controller (3), and selects to maintain the operation of the sub-module or bypass and cut off the sub-module.

6. The redundant power supply system of gentle straight power transmission IGCT-MMC submodule piece of claim 5 characterized in that: the power failure types comprise power input overvoltage and undervoltage, and overvoltage, undervoltage and short circuit of each output port.

7. The redundant power supply system of gentle straight power transmission IGCT-MMC submodule piece of claim 5 characterized in that: the power failure type and the threat degree thereof are obtained through the logic judgment of each failure signal.

8. The redundant power supply system of gentle straight power transmission IGCT-MMC submodule piece of claim 5 characterized in that: if the power output sent to the IGCT driver (4) by the first-stage flyback circuit unit (12) is abnormal, the local controller (2) judges the power supply fault of the IGCT driver, and sends a bypass instruction to the bypass switch controller (3) to enable the sub-module to bypass and cut out; and if the power output of any second-stage low-voltage unit (13) or the internal power of any local controller (2) and the bypass switch controller (3) is abnormal, the local controller (2) continuously maintains the operation of the sub-modules and processes the sub-modules when power failure is detected and repaired.

9. The redundant power supply system of gentle straight power transmission IGCT-MMC submodule piece of claim 1 characterized in that: the first-stage flyback circuit unit (12) outputs 35V voltage to the IGCT driver (4), and each second-stage low-voltage unit (13) outputs 15V voltage and 400V voltage to the local controller (2) and the power module (5) of the bypass switch controller (3) respectively.

10. A redundant power supply method of a redundant power supply system based on a flexible direct current transmission IGCT-MMC submodule according to any of claims 1-9, comprising the steps of:

the first stage flyback circuit unit (12) provides an independent isolation power supply for the connected IGCT driver (4);

the second-stage low-voltage unit (13) provides a redundant power supply for the local controller (2) and the bypass switch controller (3);

when a power failure occurs, the local controller (2) selects to maintain the operation of the sub-modules according to the type of the power failure and the threat degree thereof, or sends a bypass instruction to the bypass switch controller (3) to realize the bypass and the removal of the sub-modules.

Technical Field

The invention belongs to the field of high-voltage flexible direct-current power transmission, and particularly relates to a redundant power supply system and method for an IGCT-MMC sub-module of flexible direct-current power transmission.

Background

A Modular Multilevel Converter (MMC) based on an Integrated Gate-Commutated Thyristor (IGCT) is composed of a plurality of cascaded IGCT-MMC sub-modules and is used for realizing the interconversion between alternating current electric energy and direct current electric energy in a high-voltage flexible direct current system. The IGCT-MMC sub-module has compact structure, high voltage and current level and severe operation environment, and the key difficulty is how to realize the high-reliability power supply of various controllers inside.

The integrated gate commutated thyristor is a typical current control type power electronic device, the driver has large power consumption, and the driving power consumption of a single device in typical application is up to tens of watts. In order to improve the power supply reliability of the sub-modules in the MMC, a redundant power supply mode is often adopted, that is, redundant power supply of each controller in the sub-modules is realized by configuring two completely independent power supplies. However, due to the large driving power of the IGCT, if the conventional fully-duplicated redundant power supply system and method is adopted, the volume, weight and cost of the power supply will be multiplied, which is not favorable for the light-weight and compact design of the sub-module structure.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a flexible direct power transmission IGCT-MMC sub-module redundant power supply system and method, which can greatly reduce the size, weight and cost of a power supply, have high reliability and are easy to realize.

In order to achieve the purpose, the invention has the following technical scheme:

a redundant power supply system of flexible direct power transmission IGCT-MMC sub-modules comprises a high-order energy-taking power supply, an on-site controller, a bypass switch controller and an IGCT driver; the high-order energy-taking power supply comprises an input filtering module, a plurality of first-stage flyback circuit units connected with the input filtering module in parallel and a second-stage low-voltage unit connected to each first-stage flyback circuit unit; the local controller and the bypass switch controller are respectively provided with a plurality of power supply modules in a redundant manner, and each second-stage low-voltage unit is connected with each power supply module in a one-to-one correspondence manner; each first-stage flyback circuit unit is connected with an IGCT driver respectively; the local controller sends a bypass instruction to the bypass switch controller, and the bypass switch controller realizes bypass and cutting of the sub-module.

As a preferred scheme of the redundant power supply system, the high-order energy-taking power supply further comprises a plurality of power supply detection units, each first-stage flyback circuit unit and the second-stage low-voltage unit connected to the first-stage flyback circuit unit are connected with one power supply detection unit, and each power supply detection unit collects power supply fault detection signals and respectively sends the power supply fault detection signals to the local controller.

As a preferable solution of the redundant power supply system of the present invention, the power supply modules on the local controller and the bypass switch controller have an input voltage detection function.

As a preferable scheme of the redundant power supply system of the invention, the bypass switch controller sends an alarm signal to the local controller through the optical cable when the power supply fails.

As a preferred scheme of the redundant power supply system, the local controller judges the type and threat degree of the power failure according to the input voltage detection result of an internal power module and by combining the power output of the high-order energy-taking power supply and the alarm signal sent by the bypass switch controller, and selects to maintain the operation of the sub-module or bypass and cut off the sub-module.

As a preferred scheme of the redundant power supply system of the present invention, the power failure types include power input overvoltage and undervoltage, and overvoltage, undervoltage and short circuit of each output port.

As a preferred scheme of the redundant power supply system of the present invention, the power failure type and the threat level thereof are obtained by logical judgment of each failure signal.

As a preferred scheme of the redundant power supply system, if the power output sent to the IGCT driver by the first-stage flyback circuit unit is abnormal, the in-situ controller judges the power supply fault of the IGCT driver, and sends a bypass instruction to the bypass switch controller to bypass and switch out the sub-module; and if the power output of any second-stage low-voltage unit or the internal power of any local controller and the bypass switch controller is abnormal, the local controller continuously maintains the operation of the sub-modules and processes the sub-modules when power failure occurs and maintenance is carried out.

As a preferred scheme of the redundant power supply system of the present invention, the first stage flyback circuit unit outputs 35V voltage to the IGCT driver, and each of the second stage low voltage units outputs 15V voltage and 400V voltage to the power supply modules of the local controller and the bypass switch controller, respectively.

The invention also provides a redundant power supply method of the redundant power supply system based on the flexible-direct power transmission IGCT-MMC sub-module, which comprises the following steps:

the first stage flyback circuit unit provides an independent isolated power supply for the connected IGCT driver;

the second-stage low-voltage unit provides a redundant power supply for the local controller and the bypass switch controller;

when a power failure occurs, the local controller selects to maintain the operation of the sub-module according to the type of the power failure and the threat degree thereof, or sends a bypass instruction to the bypass switch controller to realize the bypass and the removal of the sub-module.

Compared with the prior art, the invention has the following beneficial effects:

the high-level energy-taking power supply is not required to be additionally configured, a single submodule can meet the normal operation of the submodule only by configuring one high-level energy-taking power supply, the high-level energy-taking power supply is provided with two stages of power supply voltage converters, namely a first-level flyback circuit unit and a second-level low-voltage unit, the first-level flyback circuit unit supplies power for each IGCT driver, the second-level low-voltage unit takes energy from different and independent first-level flyback circuit units, and the output end of the second-level flyback circuit unit is respectively connected with the local controller and the bypass switch controller, so that the redundant power supply of the local controller and the bypass switch trigger is realized. Because the working power supply required by the high-power IGCT driver is taken from the first-stage flyback circuit unit with different high-level energy-taking power supplies, the design and implementation difficulty of the flyback switch circuit is reduced. The local controller and the bypass switch controller power supplies are taken from different power supply branches, and a single circuit cannot influence the work of the controller and the bypass and the cutting of the sub-modules. Compared with the existing power supply scheme, the invention can greatly reduce the volume, weight and cost of the high-order energy-taking power supply.

Furthermore, the high-order energy-taking power supply also comprises a plurality of power supply detection units, each first-stage flyback circuit unit and the second-stage low-voltage unit connected with the first-stage flyback circuit unit are connected with one power supply detection unit, and each power supply detection unit collects power supply fault detection signals and respectively sends the power supply fault detection signals to the local controller and the bypass switch controller. When a power failure occurs, the local controller selects to maintain the operation of the sub-module according to the type of the power failure and the threat degree thereof, or sends a bypass instruction to the bypass switch controller to realize the bypass and the removal of the sub-module. The power failure types comprise power input overvoltage and undervoltage, and overvoltage, undervoltage and short circuit of each output port. The invention can realize the timely discovery and processing of power supply faults and provide effective protection for the faults of the power supply system.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic diagram of a redundant power supply system of a flexible direct power transmission IGCT-MMC sub-module according to the present invention;

in the drawings: 1-high-order energy-taking power supply; 2-local controller; 3-a bypass switch controller; 4-IGCT driver; 5-a power supply module; 11-an input filtering module; 12-a first stage flyback circuit unit; 13-a second stage low pressure unit; 14-power detection unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention.

Referring to fig. 1, the redundant power supply system of the flexible direct-current power transmission IGCT-MMC sub-module provided by the invention comprises a high-order energy-taking power supply 1, an on-site controller 2, a bypass switch controller 3 and an IGCT driver 4. In one embodiment, the high-order energy-taking power supply 1 includes an input filter module 11, two first-stage flyback circuit units 12 connected to the input filter module 11 in parallel, and a second-stage low-voltage unit 13 connected to each first-stage flyback circuit unit 12; the high-order energy-taking power supply 1 further comprises two power supply detection units 14, each first-stage flyback circuit unit 12 is connected with one second-stage low-voltage unit 13 connected to the first-stage flyback circuit unit 14, and each power supply detection unit 14 collects power supply fault detection signals and respectively sends the power supply fault detection signals to the local controller 2 and the bypass switch controller 3. The local controller 2 and the bypass switch controller 3 are respectively provided with two power supply modules 5 in a redundant manner, and each second-stage low-voltage unit 13 is correspondingly connected with each power supply module 5 one by one; the input filter module 11 is connected to two ends of the sub-module direct current capacitor, and each first-stage flyback circuit unit 12 is connected with one IGCT driver 4 respectively; the local controller 2 sends a bypass instruction to the bypass switch controller 3, and the bypass switch controller 3 realizes the bypass and the cut-off of the sub-modules. The embodiment power supply system is suitable for a half-bridge MMC sub-module containing 2 IGCT devices, and similar redundant power supply systems and methods are also suitable for sub-modules of other topological types.

The first-stage flyback circuit unit A outputs voltage 35V to supply power to the IGCT driver A and the second-stage low-voltage unit A; the first stage flyback circuit unit B outputs a voltage of 35V to supply power to the IGCT driver B and the second stage low-voltage unit B. The second-stage low-voltage unit A and the second-stage low-voltage unit B respectively comprise a path of 15V output and a path of 400V output, and are supplied to two independent power supply modules in the local controller and the bypass switch controller in a crossed mode. The power supply detection unit 14 has the functions of detecting the over-voltage and under-voltage of the power supply input, the over-voltage and under-voltage of each output port and the short circuit fault, and sends the power supply fault detection signal of the local controller 2 through the optical cable.

The local controller 2 and the bypass switch controller 3 both internally comprise two independent power modules 5 which are respectively connected with two independent output ends of the high-level energy-taking power supply 1, so that redundant power supply of the local controller 2 and the bypass switch controller 3 can be realized.

The power supply modules 5 on the local controller 2 and the bypass switch controller 3 both have an input voltage detection function. The bypass switch controller 3 sends an alarm signal to the local controller 2 through the optical cable when the power fails. And the local controller 2 combines a power failure detection signal sent by the high-order energy-taking power supply 1 and an alarm signal sent by the bypass switch controller 3, and selects to maintain the operation of the sub-module or bypass and cut off the sub-module according to the type and threat degree of the power failure. The type of the power failure and the threat degree thereof are obtained by the logic judgment of each failure signal. The power failure types comprise power input overvoltage and undervoltage, and each output port overvoltage and undervoltage and short circuit.

The invention relates to a redundant power supply method of a redundant power supply system based on a flexible direct power transmission IGCT-MMC sub-module, which comprises the following steps:

the first stage flyback circuit unit 12 provides an independent isolated power supply for the connected IGCT driver 4;

the second-stage low-voltage unit 13 provides redundant power supplies for the local controller 2 and the bypass switch controller 3;

when a power failure occurs, the local controller 2 selects to maintain the operation of the sub-modules according to the type of the power failure and the threat degree thereof, or sends a bypass instruction to the bypass switch controller 3 to realize the bypass and the removal of the sub-modules.

The power module 5 inside the local controller 2 has an input voltage detection function, and the local controller 2 receives the power failure warning signals of the bypass switch controller 3 and the high-order energy-taking power supply 1. Through the logic judgment of each fault signal, the type of the power failure and the threat degree thereof can be distinguished. When any one first-stage flyback circuit unit 12 of the high-order energy-taking power supply 1 has a fault and the 35V output is abnormal, the local controller 2 judges the IGCT drive power supply fault, and sends a bypass instruction to the bypass switch controller 3 to bypass and cut out the sub-module. When any path of second-stage low-voltage unit 13 of the high-level energy-taking power supply 1 or any one of the local controllers 2 and the bypass switch controller 3 has abnormal internal power supply, the sub-module can continue to operate normally, and the local controller 2 only sends an alarm signal to the valve control system at the moment so as to process the power failure during maintenance.

The invention provides a flexible direct power transmission IGCT-MMC sub-module redundant power supply system and a method thereof, which have the following advantages:

according to the invention, the redundant high-level energy-taking power supply 1 is not required to be additionally configured, and only one high-level energy-taking power supply 1 is required to be configured for a single submodule to meet the normal operation of the submodule and the redundant power supply requirements of the local control controller 2 and the bypass switch controller 3.

The high-order energy-taking power supply 1 is provided with two stages of power supply voltage converters and a fault detection unit, wherein the first stage of power supply voltage converter, namely a first stage flyback circuit unit 12 supplies power for each IGCT driver 4, the second stage of two power supply voltage converters, namely a second stage low-voltage unit 13 takes energy from different and independent first stage high-voltage switch circuit units, and the output ends of the two power supply voltage converters are respectively connected with an in-situ controller 2 and a bypass switch controller 3, so that redundant power supply of the in-situ controller and a bypass switch trigger is realized.

The bypass switch controller 3 comprises two independent power supply modules 5 which are respectively connected with two independent output ends (namely the output end of the second-stage low-voltage unit 13) of the high-level energy-taking power supply 1, the power supply modules 5 in the bypass switch controller have an input voltage detection function, and when overvoltage and undervoltage are input, fault alarm signals can be sent to the local controller 2 through an optical cable.

The local controller 2 comprises two independent power modules 5 which are respectively connected with two independent output ends (namely the output end of the second-stage low-voltage unit 13) of the high-level energy-taking power supply 1, and the power modules 5 in the local controller have the function of detecting input voltage. When the local controller 2 detects a power failure detection signal, a power voltage alarm signal of the bypass switch controller 3 and/or detects that the power voltage is abnormal, the bypass switch controller 3 can be triggered timely to realize reliable bypass and removal of the sub-module.

On the basis of saving the volume, weight and cost of the high-order energy-taking power supply, the invention can realize the control and protection of the sub-modules, namely the redundant power supply of the local control controller 2 and the bypass switch controller 3, and complete the effective protection of the faults of the power supply system.

While the invention has been described above with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, the contents of the above specification and drawings are merely illustrative of the invention as defined by the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It is apparent that those skilled in the art can make various modifications and variations to the present invention, which also fall within the scope of the claims of the present invention and their equivalents.