CN109586589B - MMC and submodule investment number calculation method, investment method and device - Google Patents
MMC and submodule investment number calculation method, investment method and device Download PDFInfo
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Abstract
The invention relates to a MMC and submodule investment number calculation method, an investment method and a device, comprising the following steps: counting the number of fault sub-modules on one bridge arm; when the number of the fault sub-modules on the bridge arm is less than or equal to the number of the redundant sub-modules, calculating to obtain the modulation voltage of each sub-module on the bridge arm according to the direct current bus voltage, the total number of the sub-modules on the bridge arm and the number of the fault sub-modules: vn＝Vd/[2(n‑k)]In which V isdIs a DC bus voltage, VnModulating voltage for each submodule on the bridge arm, wherein n is the total number of the submodules on the bridge arm, and k is the number of the fault submodules; and solving the ratio of the bridge arm modulation wave voltage to the modulation voltage of each submodule on the bridge arm to obtain the input number of the bridge arm submodules. According to the invention, by reducing the modulation voltage of each submodule, more redundant submodules participate in bridge arm voltage modulation, and the reliability of the flexible direct current transmission converter system is improved.
Description
Technical Field
The invention relates to a calculation method, an input method and an input device for input numbers of MMC and submodules, and belongs to the technical field of flexible direct-current power transmission of a power system.
Background
Modular multilevel flexible direct current transmission (MMC-HVDC) is a new generation of direct current transmission technology, and flexible direct current transmission is voltage source-based direct current transmission, and the voltage polarity of a direct current line is unchanged, so that multi-terminal direct current transmission is very easy to form, and power can be directly supplied to a small isolated load of a long-distance system, particularly a passive system.
The flexible direct-current transmission converter valve is composed of 6 bridge arms, each bridge arm comprises a plurality of redundant sub-modules, rated voltage (also called modulation voltage) of the sub-modules is kept unchanged when a system runs, and the number of the bridge arm sub-modules actually participating in modulation is smaller than that of the bridge arm total sub-modules. For example, in the conventional control, for a certain bridge arm, the situation that the number of fault sub-modules is less than or equal to the number of redundant sub-modules on the bridge armThe formula of the modulation voltage of each submodule on the bridge arm is calculated as Vn＝Vd/[2(n-m)]. Wherein, VdIs a DC bus voltage, VnAnd modulating voltage for each submodule on the bridge arm, wherein n is the number of the total submodules (including the number of redundant submodules) on the bridge arm, and m is the number of the redundant submodules.
It can be seen from the above calculation formula of the modulation voltage of each submodule that the calculated modulation voltage of each submodule on the bridge arm remains unchanged, the redundant submodule does not actually output power, although the redundancy submodule participates in sorting and voltage sharing, the modulation voltage of the bridge arm does not bear actual voltage output, and the total number of the inputted submodules of the bridge arm does not contain the number of the redundant submodules, so that the utilization rate of the redundant submodules is low. According to the 8% redundancy configuration requirement of engineering, the actual sub-module utilization rate is only 92%.
Disclosure of Invention
The invention aims to provide an MMC (modular multilevel converter), a calculation method of the input number of sub-modules, an input method and a device, which are used for solving the problem of low utilization rate of redundant sub-modules.
In order to solve the technical problem, the invention provides a calculation method for the input number of submodules, which comprises the following steps:
1) counting the number of fault sub-modules on one bridge arm;
2) when the number of the fault sub-modules on the bridge arm is less than or equal to the number of the redundant sub-modules, calculating to obtain the modulation voltage of each sub-module on the bridge arm according to the direct current bus voltage, the total number of the sub-modules on the bridge arm and the number of the fault sub-modules:
Vn＝Vd/[2(n-k)]
wherein, VdIs a DC bus voltage, VnModulating voltage for each submodule on the bridge arm, wherein n is the total number of the submodules on the bridge arm, and k is the number of the fault submodules;
3) and solving the ratio of the bridge arm modulation wave voltage to the modulation voltage of each submodule on the bridge arm to obtain the input number of the bridge arm submodules.
In order to solve the above technical problem, the present invention further provides a device for calculating the input number of the sub-modules, which includes a memory and a processor, wherein the processor is configured to execute instructions stored in the memory, so as to implement the method for calculating the input number of the sub-modules.
In order to solve the technical problem, the invention also provides a sub-module input control method, which comprises the following steps:
1) counting the number of fault sub-modules on one bridge arm;
2) when the number of the fault sub-modules on the bridge arm is less than or equal to the number of the redundant sub-modules, calculating to obtain the modulation voltage of each sub-module on the bridge arm according to the direct current bus voltage, the total number of the sub-modules on the bridge arm and the number of the fault sub-modules:
Vn＝Vd/[2(n-k)]
wherein, VdIs a DC bus voltage, VnModulating voltage for each submodule on the bridge arm, wherein n is the total number of the submodules on the bridge arm, and k is the number of the fault submodules;
3) and solving the ratio of the bridge arm modulation wave voltage to the modulation voltage of each submodule on the bridge arm to obtain the input number of the bridge arm submodules, and inputting the submodules according to the input number of the submodules.
In order to solve the above technical problem, the present invention further provides a sub-module input control device, which includes a memory and a processor, where the processor is configured to execute instructions stored in the memory to implement the sub-module input control method.
In order to solve the above technical problem, the present invention further provides an MMC comprising an MMC circuit, wherein each bridge arm in the MMC circuit is provided with n sub-modules, and each of the n sub-modules has m redundant sub-modules, and further comprises an MMC control device, wherein the MMC control device comprises:
a statistic module: the counting module is used for counting the number of fault sub-modules on one bridge arm;
a calculation module: when the number of the fault sub-modules on the bridge arm is less than or equal to the number of the redundant sub-modules, calculating to obtain the modulation voltage of each sub-module on the bridge arm according to the direct-current bus voltage, the total number of the sub-modules on the bridge arm and the number of the fault sub-modules:
Vn＝Vd/[2(n-k)]
wherein, VdIs a DC bus voltage, VnModulating voltage for each submodule on the bridge arm, wherein n is the total number of the submodules on the bridge arm, and k is the number of the fault submodules;
and (3) inputting a module: the bridge arm voltage-modulation circuit is used for obtaining the ratio of the bridge arm modulation wave voltage to the modulation voltage of each submodule on the bridge arm to obtain the input number of the bridge arm submodules, and the submodules are input according to the input number of the submodules.
The invention has the beneficial effects that: the calculation formula of the modulation voltage of the sub-modules is improved, so that the calculated modulation voltage of each sub-module is lower than that calculated in the prior art, the electrical stress of the sub-modules is reduced, the input number of the sub-modules is calculated according to the modulation voltage value, more redundant sub-modules participate in bridge arm voltage modulation, and the reliability of the flexible direct current transmission current conversion system is improved.
As a further improvement of the control method and the control device, in order to prevent the voltage of the sub-module from sudden change and reduce the voltage and current impact, the method further comprises the following steps:
after the sub-modules are put into operation, when the sub-modules are controlled, the given voltage value of the sub-modules is gradually adjusted to the modulation voltage of the sub-modules.
As a further development of the control method and control device, in order to increase the control reliability, the voltage setpoint of the control submodule is increased in a stepped manner or in a ramp manner to the submodule modulation voltage.
As the further improvement of MMC, in order to make the submodule voltage not to take place the sudden change, reduce voltage, electric current rush, still include:
a control module: after the submodule is put into use, when the submodule is controlled, the given voltage value of the submodule is gradually adjusted to the modulation voltage of the submodule.
As a further improvement of the MMC, in order to improve the control reliability, the control module is configured to control the voltage set-point of the sub-module to increase to the sub-module modulation voltage in a step-wise manner or in a ramp-wise manner.
As a further improvement of the MMC, the number of arms is six for the conversion of three-phase current.
Drawings
FIG. 1 is a schematic circuit diagram of the MMC of the present invention;
FIG. 2 is a flow chart of a calculation method of the input number of the sub-modules of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
MMC embodiment:
the embodiment provides an MMC, a schematic circuit diagram of which is shown in fig. 1, and the MMC comprises an MMC line, wherein the MMC line comprises six bridge arms, and every two bridge arms are connected in series and respectively connected with three phases of a, b and c. Wherein each bridge arm is provided with n submodules respectively denoted as SM1、SM2、…、SMnAnd m redundant sub-modules are arranged in the n sub-modules. Since the method for controlling the sub-modules on each bridge arm of the MMC will be described in detail in the following embodiments of the sub-module investment number calculation method and the sub-module investment control method, which are not described herein again.
The embodiment of the calculation method of the input number of the submodules comprises the following steps:
in order to control the sub-modules on each bridge arm of the MMC in fig. 1, the present embodiment provides a method for calculating the input number of sub-modules, and a flowchart of the method is shown in fig. 2, and includes the following steps:
1) and counting the number of fault submodules on one bridge arm.
The control system of the flexible direct current transmission converter valve collects the state information of each submodule on a bridge arm in the current control period, judges the state of each submodule according to the state information of each submodule, and further counts the number k of faulty submodules.
2) When the number of the fault sub-modules on the bridge arm is less than or equal to the number of the redundant sub-modules, calculating to obtain the modulation voltage of each sub-module on the bridge arm according to the direct current bus voltage, the total number of the sub-modules on the bridge arm and the number of the fault sub-modules:
Vn＝Vd/[2(n-k)]
wherein, VdIs a DC bus voltage, VnAnd modulating voltage for each submodule on the bridge arm, wherein n is the total number of the submodules on the bridge arm, k is the number of fault submodules, k is less than or equal to m, and m is the number of redundant submodules.
Modulating voltage V by each submodule on the bridge armnThe calculation formula can enable all the non-fault sub-modules to participate in bridge arm voltage modulation, and compared with the traditional control, the modulation voltage value of each sub-module on the bridge arm is reduced.
3) The ratio of the bridge arm modulation wave voltage to the modulation voltage of each submodule on the bridge arm is obtained to obtain the input number of the bridge arm submodules, and the calculation formula is as follows:
Nsm＝Vs/Vn
wherein Nsm is the input number of bridge arm submodules, VsThe wave voltage is modulated for the bridge arm.
The embodiment of the submodule investment control method comprises the following steps:
on the basis of the above sub-module input number calculation method embodiment, this embodiment provides a sub-module input control method, where the control method inputs sub-modules according to the input number Nsm of the bridge arm sub-modules calculated in the sub-module input number calculation method embodiment, and the input number of the bridge arm sub-modules is the input number of the sub-modules. In the input process, a bridge arm voltage modulation and voltage-sharing control algorithm is combined to generate an on-off control instruction of the submodule and send the on-off control instruction to the submodule to execute.
It should be noted that bridge arms of the converter valve are mutually independent, and each submodule on each bridge arm independently realizes the submodule input control method. In addition, when the modulation voltage Vn of each sub-module on the bridge arm is updated in the valve control system, in order to prevent the voltage of the bridge arm sub-module from suddenly changing so as to reduce voltage and current impact, after the sub-modules are put into use, when the sub-modules are controlled, the voltage given value of the sub-modules is gradually adjusted to the modulation voltage of the sub-modules. For example, the voltage set-point of the sub-module may be controlled to increase to the sub-module modulation voltage in a step manner, or the voltage set-point of the sub-module may be controlled to adjust to the sub-module modulation voltage in a ramp manner. The voltage given value of the submodule is increased to the submodule modulation voltage according to a step mode, namely the voltage given value of the submodule is adjusted to the submodule modulation voltage finally according to a mode of gradually increasing an arithmetic progression.
The submodule input control method is realized in a flexible direct-current transmission converter valve control system, the redundant submodules are used for participating in bridge arm voltage modulation, the modulation voltage of the bridge arm submodules is dynamically adjusted, the utilization rate of the submodules is improved, the electrical stress of the submodules is reduced, and the reliability of the flexible direct-current transmission converter valve is enhanced.
The embodiment of the device for calculating the input number of the submodules comprises the following steps:
the embodiment provides a sub-module investment number calculation device, which comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory so as to realize the sub-module investment number calculation method. Since the method for calculating the input number of the sub-module is described in detail in the embodiment of the method for calculating the input number of the sub-module, for those skilled in the art, a corresponding instruction can be obtained according to the method for calculating the input number of the sub-module to obtain the device for calculating the input number of the sub-module, and details are not described here.
Submodule input control device embodiment:
the embodiment provides a sub-module input control device, which comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory so as to realize the sub-module input control method. Since the sub-module investment control method has been described in detail in the above sub-module investment control method embodiment, for those skilled in the art, a corresponding instruction may be obtained according to the sub-module investment control method to obtain the sub-module investment control device, which is not described herein again.
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 used for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present application, various changes, modifications or equivalents of the embodiments of the present application can be made, and these changes, modifications or equivalents are within the protection scope of the claims of the present invention.
Claims (10)
1. A calculation method for input number of submodules is characterized by comprising the following steps:
1) counting the number of fault sub-modules on one bridge arm;
2) when the number of the fault sub-modules on the bridge arm is less than or equal to the number of the redundant sub-modules, calculating to obtain the modulation voltage of each sub-module on the bridge arm according to the direct current bus voltage, the total number of the sub-modules on the bridge arm and the number of the fault sub-modules:
Vn＝Vd/[2(n-k)]
wherein, VdIs a DC bus voltage, VnModulating voltage for each submodule on the bridge arm, wherein n is the total number of the submodules on the bridge arm, and k is the number of the fault submodules;
3) and solving the ratio of the bridge arm modulation wave voltage to the modulation voltage of each submodule on the bridge arm to obtain the input number of the bridge arm submodules.
2. A method for sub-module input control, comprising the steps of:
1) counting the number of fault sub-modules on one bridge arm;
2) when the number of the fault sub-modules on the bridge arm is less than or equal to the number of the redundant sub-modules, calculating to obtain the modulation voltage of each sub-module on the bridge arm according to the direct current bus voltage, the total number of the sub-modules on the bridge arm and the number of the fault sub-modules:
Vn＝Vd/[2(n-k)]
wherein, VdIs a DC bus voltage, VnModulating voltage for each submodule on the bridge arm, wherein n is the total number of the submodules on the bridge arm, and k is the number of the fault submodules；
3) And solving the ratio of the bridge arm modulation wave voltage to the modulation voltage of each submodule on the bridge arm to obtain the input number of the bridge arm submodules, and inputting the submodules according to the input number of the submodules.
3. The sub-module investment control method of claim 2, further comprising:
after the sub-modules are put into operation, when the sub-modules are controlled, the given voltage value of the sub-modules is gradually adjusted to the modulation voltage of the sub-modules.
4. The sub-module input control method of claim 3, wherein the voltage setpoint of the control sub-module is increased in a stepped manner or in a ramp manner to the sub-module modulation voltage.
5. A submodule investment number calculation apparatus, comprising a memory and a processor, wherein the processor is configured to execute instructions stored in the memory to implement the submodule investment number calculation method of claim 1.
6. A sub-module investment control device comprising a memory and a processor for executing instructions stored in the memory to implement the sub-module investment control method of any one of claims 2-4.
7. The utility model provides a MMC, includes the MMC circuit, be provided with n submodule pieces on every bridge arm in the MMC circuit, there are m redundant submodule pieces in the n submodule pieces, its characterized in that still includes MMC controlling means, MMC controlling means includes:
a statistic module: the counting module is used for counting the number of fault sub-modules on one bridge arm;
a calculation module: when the number of the fault sub-modules on the bridge arm is less than or equal to the number of the redundant sub-modules, calculating to obtain the modulation voltage of each sub-module on the bridge arm according to the direct-current bus voltage, the total number of the sub-modules on the bridge arm and the number of the fault sub-modules:
Vn＝Vd/[2(n-k)]
wherein, VdIs a DC bus voltage, VnModulating voltage for each submodule on the bridge arm, wherein n is the total number of the submodules on the bridge arm, and k is the number of the fault submodules;
and (3) inputting a module: the bridge arm voltage-modulation circuit is used for obtaining the ratio of the bridge arm modulation wave voltage to the modulation voltage of each submodule on the bridge arm to obtain the input number of the bridge arm submodules, and the submodules are input according to the input number of the submodules.
8. The MMC of claim 7, further comprising:
a control module: after the submodule is put into use, when the submodule is controlled, the given voltage value of the submodule is gradually adjusted to the modulation voltage of the submodule.
9. The MMC of claim 8, wherein the control module is configured to control the voltage setpoint of the sub-module to increase to the sub-module modulation voltage in a step-wise or ramp-wise manner.
10. The MMC of any of claims 7-9, wherein the number of legs is six.
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| CN112688547B (en) * | 2020-12-22 | 2022-05-20 | 许继集团有限公司 | Fault-tolerant control method and device for asymmetric operation fault of MMC-HVDC bridge arm |
| CN113364319B (en) * | 2021-05-28 | 2022-06-14 | 南方电网科学研究院有限责任公司 | MMC operation control method, device, equipment and storage medium |
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| JPH03277006A (en) * | 1990-03-27 | 1991-12-09 | Nec Corp | High frequency power output control method |
| JPH04358487A (en) * | 1991-06-05 | 1992-12-11 | Toshiba Corp | Catv system maintenance equipment |
| CN100414807C (en) * | 2005-01-21 | 2008-08-27 | 广西新未来信息产业股份有限公司 | Current-sharing control method and system for parallel modular inverse power supply |
| CN103227464B (en) * | 2013-03-22 | 2015-05-20 | 南京南瑞继保电气有限公司 | Submodule redundancy configuration method of flexible direct-current transmission control system |
| CN104078994B (en) * | 2014-07-11 | 2016-03-02 | 东南大学 | A kind of modular multi-level converter with DC Line Fault ride-through capability |
| CN106026733B (en) * | 2016-07-12 | 2018-06-01 | 国网江苏省电力有限公司检修分公司 | A kind of general SVPWM method of modularization multi-level converter |
| CN106533235B (en) * | 2016-12-26 | 2019-02-01 | 中国西电电气股份有限公司 | A kind of half-bridge MMC inverter and control method containing Redundant Control |
| CN106787885B (en) * | 2017-02-27 | 2019-05-31 | 中国石油大学(华东) | A kind of MMC System Fault Tolerance control method of irredundant submodule |
| EP3373433B1 (en) * | 2017-03-07 | 2020-04-29 | ABB Schweiz AG | A photovoltaic power plant system |
| CN107231085B (en) * | 2017-04-07 | 2019-05-21 | 中国矿业大学 | One kind being based on the bipolar equipotential MMC-HVDC direct-current short circuit fault ride-through method of DC bus |
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