CN109546882B - Half-full hybrid MMC based on hybrid full bridge and control method thereof - Google Patents
Half-full hybrid MMC based on hybrid full bridge and control method thereof Download PDFInfo
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- CN109546882B CN109546882B CN201811349510.4A CN201811349510A CN109546882B CN 109546882 B CN109546882 B CN 109546882B CN 201811349510 A CN201811349510 A CN 201811349510A CN 109546882 B CN109546882 B CN 109546882B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Abstract
The invention provides a semi-full hybrid Modular Multilevel Converter (MMC) based on a hybrid full bridge and a control method thereof. A plurality of half-bridge submodules are connected in series in the half-full hybrid MMC valve section, and multi-level output capacity can be realized by controlling the half-bridge submodules; through the switching operation of the hybrid full-bridge valve section, the port of the valve section can be controlled to output a positive level or a negative level to the outside of the whole body. The invention provides a control method of a half-full hybrid MMC based on a hybrid full bridge, which is divided into two conditions of normal operation of a circuit where the half-full hybrid MMC based on the hybrid full bridge is located and turning over of the hybrid full bridge after a direct current fault is detected by the circuit where the half-full hybrid MMC based on the hybrid full bridge is located.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a half-full hybrid MMC based on a hybrid full bridge and a control method thereof.
Background
A flexible direct-current transmission technology based on a Modular Multilevel Converter (MMC) is an important link for constructing a multi-terminal direct-current and direct-current power grid in the future.
With the development of the MMC to higher voltage and larger capacity, the overhead line power transmission scheme has obvious economic advantages. However, the overhead line dc fault rate is high, the engineering practice of the dc circuit breaker is still immature, and the dc side fault clearance of the flexible dc transmission system is difficult. The half-bridge submodule and full-bridge submodule mixed type flexible direct current converter valve is adopted, the voltage on the direct current side can be clamped to be near zero voltage through the full-bridge submodule outputting a negative level, the voltage supporting capacity on the alternating current side is kept, and semi-full mixing non-blocking direct current fault ride-through is achieved.
In order to meet the requirement of clearing faults on a direct current side, a Half-Full hybrid MMC requires a Full-Bridge submodule with a certain proportion, the number of Full-Bridge submodule (FBSM) devices with negative level output capability is twice that of conventional Half-Bridge submodule (HBSM), loss is greatly increased, and the Half-Full hybrid MMC does not have advantages in economy. The economy is comprehensively considered, and the characteristics of Modular Multilevel Converter (MMC) modular configuration are combined, so that the submodule hybrid MMC comes into play. However, the full-bridge sub-module still significantly increases the investment cost of the hybrid MMC, and therefore, it is a direction that needs to pay attention to reduce the investment on the full-bridge sub-module even when the dc side fault clearing capability is satisfied.
Research is currently underway to reduce the cost of sub-modules with negative level output capability. In view of the difficulty in simplifying the structure of a single-level full-bridge submodule, the main research is focused on a modular multi-level submodule topology with negative-level output capability, and the focus is on reducing the number of devices required by unit level. There is also a gap in valve section topology research that enables a portion of the valve section to have negative level output capability as a whole.
Disclosure of Invention
In order to solve the problems of large steady-state loss and poor economy of the semi-full hybrid MMC in the prior art, the invention provides a semi-full hybrid Modular Multilevel Converter (MMC) based on a hybrid full bridge and a control method thereof. The on-state bypass is used for realizing the conduction of steady-state current in the converter station when the direct-current line normally runs, the sub-module runs according to a normal half-bridge state, and the port of the sub-module outputs a positive level to the outside so as to reduce the on-state loss; the pressure-resistant valve section is used for realizing hybrid full-bridge turnover when a direct current fault occurs, and the valve section outputs a negative level to the outside to realize no-lock ride-through; the MMC half-bridge submodule is connected in series and used for achieving the rectification inversion function of the converter station, and the modulation mode is consistent with that of a traditional half-bridge MMC. A plurality of half-bridge submodules are connected in series in the half-full hybrid MMC valve section, and multi-level output capacity can be realized by controlling the half-bridge submodules; through the switching operation of the hybrid full-bridge valve section, the port of the valve section can be controlled to output a positive level or a negative level to the outside of the whole body. The invention provides a control method of a half-full hybrid MMC based on a hybrid full bridge, which is divided into two conditions of normal operation of a circuit where the half-full hybrid MMC based on the hybrid full bridge is located and turning over of the hybrid full bridge after a direct current fault is detected by the circuit where the half-full hybrid MMC based on the hybrid full bridge is located. The logic is simple, the method is economical and reliable, the direct current fault ride-through can be realized, the investment cost is saved, and the steady-state loss is reduced.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
in one aspect, the present invention provides a half-full hybrid MMC based on a hybrid full bridge, comprising:
the on-state bypass is used for realizing the conduction of steady-state current in the converter station when the direct-current line normally runs, the sub-module runs according to a normal half-bridge state, and the port of the sub-module outputs a positive level to the outside so as to reduce the on-state loss;
and the pressure-resistant valve section is used for realizing hybrid full-bridge turnover when a direct current fault occurs, and the valve section outputs a negative level to the outside so as to realize no-latching ride-through.
The MMC half-bridge submodule is connected in series and used for achieving the rectification inversion function of the converter station, and the modulation mode is consistent with that of a traditional half-bridge MMC.
The on-state bypasses 1, 4 are connected in series with the pressure-resistant valve sections 2, 3, respectively, forming common points a and b.
The series MMC half-bridge submodule is connected in parallel with a branch formed by connecting the on-state bypass and the pressure-resistant valve section in series.
The on-state bypass comprises an ultra-fast mechanical switch UFD and a load change-over switch LCS connected with the ultra-fast mechanical switch in series;
the load transfer switch comprises N IGBT units, and the N IGBT units are combined in a series connection mode and an anti-series connection mode;
the IGBT unit comprises an IGBT and a diode connected with the IGBT in an anti-parallel mode.
The voltage-resistant valve section comprises a single IGBT and a plurality of thyristors, and the IGBT and the thyristors are connected in series.
The series MMC half-bridge sub-module comprises a capacitor, an IGBT and a diode connected with the IGBT in an anti-parallel mode.
The on-state bypass topology may also be the same topology as the pressure resistant valve section.
On the other hand, when the circuit where the half-full hybrid MMC based on the hybrid full-bridge is located normally runs, the invention provides a control method of the half-full hybrid MMC based on the hybrid full-bridge, which comprises the following steps:
the one-way IGBT who leads to the bypass all switches on in half full hybrid MMC based on hybrid full-bridge, and steady state electric current flows through the half-bridge submodule piece through the bypass, and MMC is according to normal half-bridge state operation, and inside half-bridge submodule piece and outside half-bridge submodule piece participate in the sequencing simultaneously.
On the other hand, after the hybrid full-bridge is overturned after a direct current fault is detected by a circuit where the hybrid full-bridge based semi-full hybrid MMC is located, the invention also provides another hybrid full-bridge based semi-full hybrid MMC control method, which comprises the following steps:
and on the basis of the hybrid full-bridge semi-fully hybrid MMC, the IGBT and the thyristor of the pressure-resistant valve section are both switched on, the IGBT of the on-state bypass is switched off, and a brake-separating instruction is sent to the ultra-fast mechanical switch UFD.
After the ultra-fast mechanical switch is reliably turned off, the half-bridge submodule in the valve section is unlocked, at the moment, the hybrid full-bridge valve section outputs negative levels through 2 and 3 bridge arms, and semi-full hybrid no-lockout fault ride-through can be realized by setting a direct-current side voltage command to zero.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention provides a half-full hybrid MMC based on a hybrid full bridge, which comprises an on-state bypass, a pressure-resistant valve section and a serial MMC half-bridge submodule. The on-state bypass is used for realizing the conduction of steady-state current in the converter station when the direct-current line normally runs, the sub-module runs according to a normal half-bridge state, and the port of the sub-module outputs a positive level to the outside so as to reduce the on-state loss; the pressure-resistant valve section is used for realizing hybrid full-bridge turnover when a direct current fault occurs, and the valve section outputs a negative level to the outside to realize no-lock ride-through; the MMC half-bridge sub-modules are connected in series and used for realizing the rectification and inversion functions of the converter station, and the modulation mode is consistent with that of the traditional half-bridge MMC;
the control method of the half-full hybrid MMC based on the hybrid full bridge is divided into two conditions that a circuit where the half-full hybrid MMC based on the hybrid full bridge is located normally runs and the circuit where the half-full hybrid MMC based on the hybrid full bridge is located overturns the hybrid full bridge after a direct current fault is detected, so that the half-full hybrid MMC based on the hybrid full bridge is controlled, the control mode is simple, and the controllability is strong;
the on-state bypass is used for enabling steady-state current to flow through a half-full hybrid MMC based on a hybrid full bridge when a circuit normally runs, and a unidirectional IGBT and a diode are adopted, so that the cost of devices is saved, and steady-state loss is reduced;
according to the technical scheme provided by the invention, a large number of half-bridge sub-modules are connected in series in the valve section, and multi-level output capacity can be realized by controlling the half-bridge sub-modules;
according to the technical scheme provided by the invention, the ports of the valve section can be controlled to output a positive level or a negative level to the outside integrally through the circuit switching operation of the hybrid full-bridge valve section.
The technical scheme provided by the invention uses the low-cost semi-controlled device, so that the investment can be effectively saved.
Drawings
Fig. 1 is a structural diagram of a half-full hybrid MMC based on a hybrid full bridge in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a hybrid MMC derivative based on a hybrid full bridge in example 1 of the present invention;
FIG. 3 is a schematic view of a steady-state current path in embodiment 2 of the present invention;
fig. 4 is a schematic diagram illustrating the current flowing after the hybrid full bridge is flipped in embodiment 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
The embodiment 1 of the invention provides a half-full hybrid MMC based on a hybrid full bridge, which specifically comprises an on-state bypass, a pressure-resistant valve section and a series MMC half-bridge submodule, wherein each branch has the following functions:
the on-state bypass is used for realizing the conduction of steady-state current in the converter station when a direct-current line normally runs, the submodule runs according to a normal half-bridge state, and a submodule port outputs a positive level to the outside so as to reduce on-state loss;
the pressure-resistant valve section is used for realizing hybrid full-bridge turnover when a direct current fault occurs, and the valve section outputs a negative level to the outside to realize no-lock ride-through.
The series MMC half-bridge submodule is used for achieving a rectification inversion function of the converter station, and a modulation mode is consistent with that of a traditional half-bridge MMC.
A schematic structural diagram of a half-full hybrid MMC based on a hybrid full bridge according to embodiment 1 of the present invention is shown in fig. 1, and in fig. 1, the on-state bypasses 1 and 4 are respectively connected in series with the pressure-resistant valve sections 2 and 3 to form common points a and b.
The serial MMC half-bridge sub-module is connected in parallel with a branch formed by connecting the on-state bypass and the pressure-resistant valve section in series.
The on-state bypass comprises an ultra-fast mechanical switch UFD and a load change-over switch LCS connected with the ultra-fast mechanical switch in series;
the load transfer switch comprises N IGBT units, and the N IGBT units are combined in a series connection mode and an anti-series connection mode;
the IGBT unit comprises an IGBT and a diode connected with the IGBT in an anti-parallel mode.
The voltage-resistant valve section comprises a single IGBT and a plurality of thyristors, and the IGBTs and the thyristors are connected in series.
The series MMC half-bridge sub-module comprises a capacitor, an IGBT and a diode connected with the IGBT in an anti-parallel mode.
The on-state bypass topology described above can also be exactly the same topology as the pressure resistant valve section. The schematic diagram of the half-full hybrid MMC derivative structure based on the hybrid full bridge is shown in FIG. 2.
Example 2
The embodiment 2 of the invention provides a control method of a half-full hybrid MMC based on a hybrid full bridge, which comprises the following specific processes:
under the direct current circuit normal operating condition at half full hybrid MMC place based on hybrid full-bridge, the one-way IGBT who leads to the bypass all switches on in the half full hybrid MMC based on hybrid full-bridge, and steady state current flows through the half-bridge submodule piece through the bypass, and MMC is according to normal half-bridge state operation, and inside half-bridge submodule piece and outside half-bridge submodule piece participate in the sequencing simultaneously. The flow path of the steady-state current is schematically shown in fig. 3 when the line is in normal operation.
Example 3
The half-full hybrid MMC control method based on the hybrid full bridge provided in embodiment 3 of the present invention is suitable for performing a hybrid full bridge inversion after detecting a dc fault on a line where the half-full hybrid MMC based on the hybrid full bridge is located, and the specific process is as follows:
and on the basis of the hybrid full-bridge semi-fully hybrid MMC, the IGBT and the thyristor of the pressure-resistant valve section are both switched on, the IGBT of the on-state bypass is switched off, and a brake-separating instruction is sent to the ultra-fast mechanical switch UFD.
After the ultra-fast mechanical switch is reliably turned off, the half-bridge submodule in the valve section is unlocked, at the moment, the hybrid full-bridge valve section outputs negative levels through 2 and 3 bridge arms, and semi-full hybrid no-lockout fault ride-through can be realized by setting a direct-current side voltage command to zero. The schematic diagram of the current flow path in the case of a line fault is shown in fig. 4.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (5)
1. A half-full hybrid MMC based on a hybrid full bridge is characterized in that the half-full hybrid MMC is formed by connecting a branch formed by connecting two on-state bypasses and pressure-resistant valve sections in series with a series MMC half-bridge submodule in parallel, and comprises an on-state bypass bridge arm 1, an on-state bypass bridge arm 4, a pressure-resistant valve section bridge arm 2 and a pressure-resistant valve section bridge arm 3, wherein the on-state bypass bridge arm 1 is connected with the pressure-resistant valve section bridge arm 2 in series, and the on-state bypass bridge arm 4 is connected with the pressure-resistant valve section bridge arm 3 in series to form common points a and b;
the on-state bypass consists of an ultra-fast mechanical switch UFD and a load change-over switch LCS connected with the ultra-fast mechanical switch in series, the load change-over switch is formed by connecting IGBT units in series in an anti-reverse mode, the IGBT units comprise IGBTs and diodes connected with the IGBTs in anti-parallel mode, the whole on-state bypass is used for realizing conduction of steady-state current in the converter station when a direct-current circuit normally operates, the sub-module operates according to a normal half-bridge state, and a port of the sub-module outputs a positive level to the outside so as to reduce on-;
the voltage-resistant valve section is composed of a single IGBT, a plurality of thyristors and a plurality of diodes, wherein the plurality of thyristors are connected in series in the same direction, the plurality of diodes are connected in series in the same direction, the collector electrode of the single IGBT is connected with the cathode of the thyristor at the tail end of the branch formed by the plurality of thyristors in series in the same direction, the emitter electrode of the single IGBT is connected with the anode of the diode at the tail end of the branch formed by the plurality of diodes in series in the same direction, the anode of the head end thyristor of the branch formed by the plurality of thyristors in series in the same direction is connected with the cathode of the head end diode of the branch formed by the plurality of diodes in series in the same direction, and the voltage-resistant valve section is used for realizing full-bridge mixed turnover when a direct current fault occurs;
the MMC half-bridge submodule is connected in series and used for achieving the rectification inversion function of the converter station, and the modulation mode is consistent with that of a traditional half-bridge MMC.
2. The hybrid full-bridge based semi-full hybrid MMC of claim 1, wherein the series MMC half-bridge sub-module comprises a capacitor, an IGBT, and a diode in anti-parallel with the IGBT.
3. The hybrid full-bridge based semi-full hybrid MMC of claim 1, wherein the on-state bypass topology may also employ the exact same topology as the pressure-resistant valve section.
4. A method for controlling a half-full hybrid MMC based on a hybrid full-bridge as claimed in any one of claims 1-2, wherein the circuit on which the half-full hybrid MMC based on the hybrid full-bridge is located is in normal operation, the method comprises:
the IGBT of on-state bypass all switches on in half full hybrid MMC based on hybrid full-bridge, and steady state electric current flows through the half-bridge submodule through the on-state bypass, and MMC operates according to normal half-bridge state.
5. A method for controlling a half-full hybrid MMC based on a hybrid full-bridge as claimed in any one of claims 1-2, wherein the half-full hybrid MMC based on a hybrid full-bridge turns over the hybrid full-bridge after detecting a dc fault on a line, and the method comprises:
on the basis of the hybrid full-bridge semi-full hybrid MMC, the IGBT and the thyristor of the pressure-resistant valve section are both conducted, the IGBT of the on-state bypass is turned off, and a brake-separating instruction is sent to the ultra-fast mechanical switch UFD;
after the ultra-fast mechanical switch is reliably turned off, the half-bridge submodule in the valve section is unlocked, at the moment, the half-full hybrid MMC of the hybrid full bridge outputs a negative level to the outside through the pressure-resistant valve section bridge arms 2 and 3, and the half-full hybrid MMC can be free of lockout fault ride-through by setting a direct-current side voltage instruction to zero.
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| CN102931863B (en) * | 2012-11-12 | 2015-04-15 | 华北电力大学 | Method for setting up modularized multi-level converter composite structure model |
| CN105022285B (en) * | 2015-06-18 | 2019-01-04 | 国网智能电网研究院 | A kind of IGBT switching transients real-time emulation system based on characteristic curve insertion |
| CN105071675B (en) * | 2015-07-23 | 2018-03-09 | 浙江大学 | A kind of mixed type power switch and its application in flexible direct-current transmission converter |
| CN105375875A (en) * | 2015-12-04 | 2016-03-02 | 深圳市华杰电气技术有限公司 | Reverse current blocking device |
| CN106998138B (en) * | 2016-01-25 | 2019-07-05 | 华北电力大学 | Bidirectional DC-DC converter without Pressure and Control |
| KR102600766B1 (en) * | 2016-09-22 | 2023-11-13 | 엘에스일렉트릭(주) | Modular multi-level converter |
| CN107317472A (en) * | 2017-06-30 | 2017-11-03 | 中国西电电气股份有限公司 | A kind of full-bridge starts method with half-bridge mixed type module multilevel converter |
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