CN112491026B - Dynamic voltage equalizing control method and device for direct current energy consumption device - Google Patents
Dynamic voltage equalizing control method and device for direct current energy consumption device Download PDFInfo
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- CN112491026B CN112491026B CN202011114448.8A CN202011114448A CN112491026B CN 112491026 B CN112491026 B CN 112491026B CN 202011114448 A CN202011114448 A CN 202011114448A CN 112491026 B CN112491026 B CN 112491026B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a dynamic voltage equalizing control method and a dynamic voltage equalizing control device for a direct current energy consumption device, wherein the method comprises the following steps: obtaining the fault number of the sub-modules; obtaining a critical value of a failure sub-module; judging whether the fault quantity of the sub-modules is smaller than the critical value of the fault sub-modules or not; if the number of faults of the sub-modules is smaller than the critical value of the fault sub-modules, the sub-modules in the normal state are cut off and used for dynamic voltage equalizing control; if the number of faults of the sub-modules is larger than or equal to the critical value of the faulty sub-module and smaller than the upper limit value of the faulty sub-module, cutting off the preset number of sub-modules for dynamic voltage equalizing control. The number of the sub-modules participating in the pressure equalizing control is dynamically adjusted by monitoring the number of different fault sub-modules in the energy consumption valve, so that the pressure equalizing control of the sub-modules under the condition that the energy consumption device does not increase redundant sub-modules is realized on the premise of ensuring the pressure equalizing characteristic, the pressure equalizing of the sub-modules is realized by increasing the number of more sub-modules, and the structural complexity and the cost of the energy consumption valve are reduced.
Description
Technical Field
The invention relates to the technical field of power equipment control, in particular to a dynamic voltage equalizing control method and device for a direct current energy consumption device.
Background
The direct current energy consumption device can effectively inhibit direct current overvoltage and realize fault ride-through of the high-voltage direct current transmission system. The centralized direct current energy consumption topology is generally formed by connecting a plurality of half-bridge sub-modules and energy consumption resistors in series, and becomes a general technical scheme.
The voltage equalizing control of the sub-modules is a key technology for researching the direct current energy consumption device, and the voltage equalizing control characteristic of the sub-modules directly relates to safe and reliable operation of the direct current energy consumption device. In addition, as a large number of half-bridge sub-modules are connected in series with each bridge arm of the centralized direct current energy consumption device, the structural complexity and the cost of the centralized direct current energy consumption device are also factors which must be considered in designing a voltage equalizing control method. Therefore, how to design a dynamic pressure equalizing method of a submodule capable of reducing the structural complexity and the cost on the premise of meeting the pressure equalizing characteristic becomes an important subject in the field.
In the prior art, when the redundant modules of the direct current energy consumption device are sufficient, the voltage equalizing control can be realized by cutting off the redundant modules. For the voltage-sharing control of the direct current energy consumption device submodule, the voltage-sharing control can be realized by cutting off the redundant module in the prior art, but when the redundancy is gradually consumed, the voltage-sharing capability of the device is gradually reduced, and when the redundancy is about to be consumed, the system thoroughly loses the voltage-sharing capability.
Disclosure of Invention
The embodiment of the invention aims to provide a dynamic voltage-sharing control method and device for a direct current energy consumption device, which dynamically adjust the number of submodules participating in voltage-sharing control by monitoring the number of different fault submodules in an energy consumption valve, realize the voltage-sharing control of the submodules under the condition that the energy consumption device does not increase redundant submodules on the premise of ensuring the voltage-sharing characteristic, avoid realizing the voltage sharing of the submodules by increasing the number of more submodules, and reduce the structural complexity and cost of the energy consumption valve.
In order to solve the above technical problems, a first aspect of the embodiments of the present invention provides a dynamic voltage equalizing control method for a dc energy dissipation device, including the following steps:
obtaining the fault number of the submodule;
acquiring a critical value of the fault submodule;
judging whether the number of faults of the sub-modules is smaller than a critical value of the fault sub-modules or not;
if the number of faults of the submodules is smaller than the critical value of the fault submodule, cutting off the submodule in a normal state for dynamic voltage equalizing control;
and if the number of faults of the submodules is larger than or equal to the critical value of the fault submodule and smaller than the upper limit value of the fault submodule, cutting off the preset number of the submodules for dynamic voltage equalizing control.
Further, the obtaining the critical value of the fault sub-module includes:
selecting a voltage limit value of a sub-module when the redundant sub-module is exhausted;
obtaining the submodule cutting number according to the voltage limit value, and further obtaining the critical value of the fault submodule;
the critical value of the failure submodule is the difference between the number of the redundant submodules and the submodule cutting number of the preset value.
Further, the dynamic voltage equalizing control method of the direct current energy consumption device further comprises the following steps:
and if the fault number of the submodule is larger than or equal to the upper limit value of the fault submodule, locking the direct current energy consumption device.
Accordingly, a second aspect of the embodiments of the present invention provides a dynamic voltage equalizing control device for a dc power consumption device, including:
the first acquisition module is used for acquiring the fault number of the submodule;
the second acquisition module is used for acquiring the critical value of the failure sub-module;
the judging module is used for judging whether the number of faults of the sub-modules is smaller than the critical value of the fault sub-module;
the control module is used for cutting off the submodule in a normal state for dynamic voltage equalizing control when the number of faults of the submodule is smaller than the critical value of the fault submodule;
the control module is further used for cutting off the preset number of sub-modules for dynamic voltage equalizing control when the number of faults of the sub-modules is larger than or equal to the critical value of the fault sub-modules and smaller than the upper limit value of the fault sub-modules.
Further, the second acquisition module includes:
a first acquisition unit for acquiring a voltage limit value of a redundant sub-module when the sub-module is exhausted;
the second acquisition unit is used for acquiring the submodule cutting number according to the voltage limit value so as to obtain the critical value of the fault submodule;
the critical value of the failure submodule is the difference between the number of the redundant submodules and the submodule cutting number of the preset value.
Further, the control module is further configured to lock the dc power consumption device when the number of faults of the sub-module is greater than or equal to an upper limit value of the faulty sub-module.
Accordingly, a third aspect of the embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by the one processor, and the instructions are executed by the one processor, so that the at least one processor executes the dynamic voltage equalizing control method of the direct current energy consumption device.
Accordingly, a fourth aspect of the embodiments of the present invention provides a computer readable storage medium, which is characterized in that a computer instruction is stored thereon, and the instruction is executed by a processor to implement the method for dynamic voltage equalizing control of a dc power consuming device.
The technical scheme provided by the embodiment of the invention has the following beneficial technical effects:
the number of the sub-modules participating in the pressure equalizing control is dynamically adjusted by monitoring the number of different fault sub-modules in the energy consumption valve, so that the pressure equalizing control of the sub-modules under the condition that the energy consumption device does not increase redundant sub-modules is realized on the premise of ensuring the pressure equalizing characteristic, the pressure equalizing of the sub-modules is realized by increasing the number of more sub-modules, and the structural complexity and the cost of the energy consumption valve are reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art DC power dissipation device;
fig. 2 is a flowchart of a dynamic voltage equalizing control method for a dc energy-consuming device according to an embodiment of the present invention;
fig. 3 is a logic diagram of a dynamic voltage equalizing control method of a direct current energy consumption device according to an embodiment of the present invention;
fig. 4 is a block diagram of a dynamic voltage equalizing control device of a direct current energy consumption device according to an embodiment of the present invention;
fig. 5 is a block diagram of a second acquisition module according to an embodiment of the present invention.
Reference numerals:
1. the device comprises a first acquisition module, a second acquisition module, a first acquisition unit, a second acquisition unit, a judgment module and a control module.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Fig. 1 is a schematic topology of a dc power consumer in the prior art.
Fig. 2 is a flowchart of a dynamic voltage equalizing control method for a dc energy-consuming device according to an embodiment of the present invention.
Fig. 3 is a logic diagram of a dynamic voltage equalizing control method for a dc energy-consuming device according to an embodiment of the present invention.
Referring to fig. 1, 2 and 3, a first aspect of the embodiment of the present invention provides a dynamic voltage equalizing control method for a dc energy consumption device, which includes the following steps:
s100, obtaining the fault number of the sub-modules.
S200, obtaining the critical value of the failure sub-module.
S300, judging whether the fault quantity of the sub-modules is smaller than the critical value of the fault sub-modules.
S400, if the number of faults of the sub-modules is smaller than the critical value of the fault sub-modules, the sub-modules in the normal state are cut off and used for dynamic voltage equalizing control.
S500, if the number of faults of the sub-modules is larger than or equal to the critical value of the faulty sub-module and smaller than the upper limit value of the faulty sub-module, cutting off the preset number of sub-modules for dynamic voltage equalizing control.
Specifically, in step S200, the obtaining the threshold of the failure submodule includes:
s210, selecting a voltage limit value of the sub-module when the redundant sub-module is exhausted.
S220, obtaining a submodule cutting number according to the voltage limit value, and further obtaining a critical value of the failure submodule.
The threshold value of the failure submodule is the difference between the number of redundant submodules and the submodule cutting number of a preset value.
Further, the dynamic voltage equalizing control method of the direct current energy consumption device further comprises the following steps:
s600, if the number of faults of the sub-modules is greater than or equal to the upper limit value of the fault sub-module, locking the direct current energy consumption device.
As shown in fig. 3, ncut is the number of cut-out submodules, ne is the number of fault submodules, nf is the critical value of the fault submodules, nr is the number of redundant submodules, and K is the preset number of submodule cut-out numbers.
The technical scheme of the invention is easy to realize, and has the characteristics of increasing the redundancy of the submodule of the device and reducing the structural complexity and cost of the device under the condition that the energy consumption device does not increase the redundancy submodule; the dynamic voltage-sharing control method can effectively solve the problem that when the submodules of the direct-current energy-consuming device are in redundant exhaustion, the system loses the voltage-sharing control capability.
Fig. 4 is a block diagram of a dynamic voltage equalizing control device for a dc energy consuming device according to an embodiment of the present invention.
Accordingly, referring to fig. 4, a second aspect of the embodiment of the present invention provides a dynamic voltage equalizing control device for a dc power consumption device, including: the device comprises a first acquisition module 1, a second acquisition module 2, a judgment module 3 and a control module 4. The first acquisition module 1 is used for acquiring the fault number of the sub-modules; the second obtaining module 2 is used for obtaining the critical value of the failure sub-module; the judging module 3 is used for judging whether the fault quantity of the sub-modules is smaller than the critical value of the fault sub-modules; the control module 4 is used for cutting off the submodule in a normal state for dynamic voltage equalizing control when the number of faults of the submodule is smaller than the critical value of the fault submodule; the control module is also used for cutting off the preset number of sub-modules for dynamic voltage equalizing control when the number of faults of the sub-modules is larger than or equal to the critical value of the fault sub-module and smaller than the upper limit value of the fault sub-module.
Fig. 5 is a block diagram of a second acquisition module according to an embodiment of the present invention.
Specifically, referring to fig. 5, the second acquisition module 2 includes: a first acquisition unit 21 and a second acquisition unit. The first obtaining unit 21 is configured to obtain a voltage limit value of the sub-module when the redundant sub-module is exhausted; the second obtaining unit 22 is configured to obtain a cut-off number of the sub-module according to the voltage limit value, so as to obtain a critical value of the failure sub-module; the threshold value of the failure submodule is the difference between the number of redundant submodules and the submodule cutting number of a preset value.
Further, the control module 4 is further configured to lock the dc power consumption device when the number of faults of the sub-module is greater than or equal to the upper limit value of the faulty sub-module.
According to the technical scheme, the number of the sub-modules participating in the pressure equalizing control is dynamically adjusted by monitoring the number of different fault sub-modules in the energy consumption valve, so that the pressure equalizing control of the sub-modules under the condition that the energy consumption device does not increase redundant sub-modules is realized on the premise of ensuring the pressure equalizing characteristic, the pressure equalizing of the sub-modules is realized by increasing the number of more sub-modules, and the structural complexity and the cost of the energy consumption valve are reduced.
Accordingly, a third aspect of the embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by a processor, the instructions being executable by the processor, to cause at least one processor to perform a method for dynamic voltage sharing control of any one of the above-described direct current energy consuming devices.
Accordingly, a fourth aspect of embodiments of the present invention provides a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement a method for dynamic voltage sharing control of a dc energy consuming device as described above.
The embodiment of the invention aims to protect a dynamic voltage equalizing control method and a dynamic voltage equalizing control device for a direct current energy consumption device, wherein the method comprises the following steps: obtaining the fault number of the sub-modules; obtaining a critical value of a failure sub-module; judging whether the fault quantity of the sub-modules is smaller than the critical value of the fault sub-modules or not; if the number of faults of the sub-modules is smaller than the critical value of the fault sub-modules, the sub-modules in the normal state are cut off and used for dynamic voltage equalizing control; if the number of faults of the sub-modules is larger than or equal to the critical value of the faulty sub-module and smaller than the upper limit value of the faulty sub-module, cutting off the preset number of sub-modules for dynamic voltage equalizing control. The technical scheme has the following effects:
the number of the sub-modules participating in the pressure equalizing control is dynamically adjusted by monitoring the number of different fault sub-modules in the energy consumption valve, so that the pressure equalizing control of the sub-modules under the condition that the energy consumption device does not increase redundant sub-modules is realized on the premise of ensuring the pressure equalizing characteristic, the pressure equalizing of the sub-modules is realized by increasing the number of more sub-modules, and the structural complexity and the cost of the energy consumption valve are reduced.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (6)
1. The dynamic voltage equalizing control method for the direct current energy consumption device is characterized by comprising the following steps of:
obtaining the fault number of the sub-modules;
obtaining a critical value of a failure sub-module;
judging whether the number of faults of the sub-modules is smaller than a critical value of the fault sub-modules or not;
if the number of faults of the submodules is smaller than the critical value of the fault submodule, cutting off the submodule in a normal state for dynamic voltage equalizing control;
if the number of faults of the submodules is larger than or equal to the critical value of the fault submodule and smaller than the upper limit value of the fault submodule, cutting off the preset number of the submodules for dynamic voltage equalizing control;
the obtaining the critical value of the fault sub-module includes:
selecting a voltage limit value of a sub-module when the redundant sub-module is exhausted;
obtaining the submodule cutting number according to the voltage limit value, and further obtaining the critical value of the fault submodule;
the critical value of the failure submodule is the difference between the number of the redundant submodules and the preset number of submodule cutting numbers.
2. The dynamic voltage equalizing control method of a direct current energy consuming device according to claim 1, further comprising:
and if the fault number of the submodule is larger than or equal to the upper limit value of the fault submodule, locking the direct current energy consumption device.
3. The utility model provides a direct current power consumption device dynamic voltage-sharing controlling means which characterized in that includes:
the first acquisition module is used for acquiring the fault number of the sub-module;
the second acquisition module is used for acquiring the critical value of the failure sub-module;
the judging module is used for judging whether the number of faults of the sub-modules is smaller than the critical value of the fault sub-module;
the control module is used for cutting off the submodule in a normal state for dynamic voltage equalizing control when the number of faults of the submodule is smaller than the critical value of the fault submodule;
the control module is further used for cutting off the preset number of sub-modules for dynamic voltage equalizing control when the number of faults of the sub-modules is larger than or equal to the critical value of the fault sub-module and smaller than the upper limit value of the fault sub-module;
the second acquisition module includes:
a first acquisition unit for acquiring a voltage limit value of a redundant sub-module when the sub-module is exhausted;
the second acquisition unit is used for acquiring the submodule cutting number according to the voltage limit value so as to obtain the critical value of the fault submodule;
the critical value of the failure submodule is the difference between the number of the redundant submodules and the preset number of submodule cutting numbers.
4. The dynamic voltage equalizing control device for the DC power consuming device according to claim 3, wherein,
the control module is also used for locking the direct current energy consumption device when the fault number of the sub-modules is larger than or equal to the upper limit value of the fault sub-module.
5. An electronic device, comprising: at least one processor; and a memory coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the one processor to cause the at least one processor to perform the dynamic voltage sharing control method of the direct current energy consumption device according to any one of claims 1-2.
6. A computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement a method of dynamic voltage sharing control of a direct current energy consuming device as claimed in any of claims 1-2.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490416A (en) * | 2013-09-12 | 2014-01-01 | 国家电网公司 | Fundamental voltage sharing type medium-voltage active power filter |
| CN109546638A (en) * | 2018-10-22 | 2019-03-29 | 南京南瑞继保电气有限公司 | A kind of direct current energy-consuming device and control method |
| CN111509686A (en) * | 2020-04-21 | 2020-08-07 | 南京南瑞继保电气有限公司 | Fault redundancy control method for modular direct current energy consumption device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490416A (en) * | 2013-09-12 | 2014-01-01 | 国家电网公司 | Fundamental voltage sharing type medium-voltage active power filter |
| CN109546638A (en) * | 2018-10-22 | 2019-03-29 | 南京南瑞继保电气有限公司 | A kind of direct current energy-consuming device and control method |
| CN111509686A (en) * | 2020-04-21 | 2020-08-07 | 南京南瑞继保电气有限公司 | Fault redundancy control method for modular direct current energy consumption device |
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