CN112383236B - Modular multilevel converter maintenance method and system based on online monitoring - Google Patents
Modular multilevel converter maintenance method and system based on online monitoring Download PDFInfo
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- CN112383236B CN112383236B CN202011155410.5A CN202011155410A CN112383236B CN 112383236 B CN112383236 B CN 112383236B CN 202011155410 A CN202011155410 A CN 202011155410A CN 112383236 B CN112383236 B CN 112383236B
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- Inverter Devices (AREA)
Abstract
The invention relates to a modular multilevel converter maintenance method and a system based on-line monitoring, wherein the method comprises the following steps: obtaining failure quantity maintenance thresholds of working sub-modules of each bridge arm in the modular multilevel converter, wherein the bridge arm comprises the working sub-modules and redundant sub-modules; acquiring the number of the work submodules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm; acquiring the maximum value of the number of the accumulated failed working sub-modules; judging whether the maximum value reaches a maintenance threshold value of the failure number of the working sub-modules; if so, performing shutdown maintenance on the modular multilevel converter; and after the maintenance is finished, jumping to the step to obtain the number of the work sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm. The invention can flexibly select the maintenance time and improve the reliability of the modular multilevel converter.
Description
Technical Field
The invention relates to the field of maintenance of modular multilevel converters, in particular to a method and a system for maintaining a modular multilevel converter based on online monitoring.
Background
In recent years, a Modular Multilevel Converter (MMC) is widely used in flexible direct current transmission, a main circuit of the MMC is composed of three phases, namely a phase, a phase b phase and a phase c phase, each phase comprises an upper bridge arm and a lower bridge arm, each bridge arm is formed by cascading numerous submodules, and the submodules comprise a working submodule and a redundant submodule. As shown in fig. 1, the MMC can normally operate when the number of failed sub-modules does not exceed the number of redundant sub-modules. At present, maintenance of the MMC is mainly performed regularly, and the sub-module with a fault is replaced regularly. However, the failure probability of the sub-modules is increased along with time, and it is highly likely that the number of failed sub-modules exceeds the redundant number at the later stage when the maintenance time is not reached, as shown in fig. 2, in the first two maintenance cycles, the maintenance node of each maintenance cycle performs scheduled shutdown maintenance on the MMC, and replaces the failed sub-modules with all bridge arm failures; but by the third maintenance period, the number of the sub modules with faults in the bridge arm 1 reaches the failure threshold value before the nodes are maintained, so that shutdown maintenance is required to be performed in a time less than the maintenance period.
Therefore, the following defects exist in the prior art:
since the probability of failure of a submodule is not constant but increases over time. The maintenance period Tp is a fixed value, and the failed submodule is replaced with a new submodule at each maintenance time. Therefore, at the later service stage of the MMC, along with the rapid increase of the failure probability of the sub-modules, the failure number of the sub-modules exceeds the redundancy number most possibly before the maintenance moment, so that the MMC cannot continue to operate, and the system is greatly damaged economically.
Disclosure of Invention
In order to overcome the inherent defects existing in the regular maintenance, the invention provides a modular multilevel converter maintenance method and a modular multilevel converter maintenance system based on online monitoring. The method is different from the conventional regular maintenance, the selection of the maintenance time is no longer a fixed time period, but a maintenance threshold (for example, 0.8 of the failure threshold) is set under the failure threshold based on the state of the system (here, the number of the failed sub-modules can be selected as the number of the MMC sub-modules), and when the number of the failed sub-modules reaches the maintenance threshold, the MMC is shut down for maintenance, so that the number of the failed sub-modules can be ensured not to reach the failure threshold, and the occurrence of MMC faults is avoided, as shown in fig. 3.
In order to achieve the purpose, the invention provides the following scheme:
a maintenance method of a modular multilevel converter based on online monitoring comprises the following steps:
obtaining failure quantity maintenance thresholds of working sub-modules of each bridge arm in the modular multilevel converter, wherein the bridge arm comprises the working sub-modules and redundant sub-modules;
acquiring the number of the work submodules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm;
obtaining the maximum value in the number of the accumulated failed working submodules;
judging whether the maximum value reaches the maintenance threshold value of the failure number of the working sub-modules;
if so, performing shutdown maintenance on the modular multilevel converter;
and after the maintenance is finished, jumping to the step to obtain the number of the work sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm.
Optionally, the maintenance threshold of the failure number of the working sub-modules of each bridge arm is 80% of the number of the redundant sub-modules in the corresponding bridge arm.
Optionally, an online monitoring system of the modular multilevel converter is adopted to obtain the number of the work submodules which are accumulated to be failed from the last shutdown maintenance in each bridge arm.
Optionally, the process of calculating the number of the work submodules accumulated to fail from the last shutdown maintenance in each bridge arm includes:
obtaining working parameters of working submodules in each bridge arm;
judging whether the working parameters exceed a monitoring threshold value;
if yes, the working sub-module is a fault sub-module, and a bypass switch of the fault sub-module is controlled to be closed;
obtaining a bridge arm where the fault sub-module is located;
controlling a bypass switch of a certain redundant sub-module in the bridge arm to be disconnected;
and adding 1 to the number of the accumulated failed working submodules in the bridge arm.
Optionally, the operating parameters include: the temperature of the bypass switch of the working submodule, the trigger signal of the IGBT and the capacitor voltage.
Optionally, the determining whether the working parameter exceeds a monitoring threshold includes:
and when a certain working parameter of a certain working submodule exceeds a monitoring threshold value, the working submodule is a fault submodule.
Optionally, the performing shutdown maintenance on the modular multilevel converter includes:
replacing all failed submodules of each bridge arm with brand-new submodules;
the values for the number of submodules that have accumulated failures are all reset to 0.
Optionally, the modular multilevel converter includes 6 legs.
A modular multilevel converter maintenance system based on online monitoring comprises:
the first data acquisition module is used for acquiring failure quantity maintenance thresholds of working sub-modules of each bridge arm in the modular multilevel converter, and each bridge arm comprises a working sub-module and a redundant sub-module;
the second data acquisition module is used for acquiring the number of the work submodules which are accumulated to be invalid in each bridge arm from the last shutdown maintenance;
the third data acquisition module is used for acquiring the maximum value in the number of the accumulated failed working sub-modules;
the judging module is used for judging whether the maximum value reaches the failure quantity maintenance threshold value of the working sub-modules;
the shutdown maintenance module is used for performing shutdown maintenance on the modular multilevel converter when the maximum value reaches a maintenance threshold value of the failure number of the working sub-modules;
and the skipping module is used for skipping to the step to obtain the number of the working sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm after the maintenance is finished.
Optionally, the second data obtaining module includes:
the working parameter acquisition unit is used for acquiring the working parameters of the working submodules in the bridge arms;
the working parameter judging unit is used for judging whether the working parameter exceeds a monitoring threshold value;
the first control unit is used for controlling a bypass switch of the fault sub-module to be closed when the working parameter exceeds a monitoring threshold value and the working sub-module is a fault sub-module;
the bridge arm acquisition unit is used for acquiring a bridge arm where the fault sub-module is located;
the second control unit is used for controlling the bypass switch of a certain redundant submodule in the bridge arm to be switched off;
and the accumulation unit is used for adding 1 to the number of the accumulated failed working submodules in the bridge arm.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention flexibly selects the maintenance time without being limited by a fixed time period, can measure the number of the fault sub-modules in real time by utilizing online monitoring, and flexibly selects the maintenance time based on the number of the fault sub-modules, thereby improving the reliability of the system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a modular multilevel converter topology;
FIG. 2 is a diagram illustrating the effect of conventional periodic maintenance;
FIG. 3 is a schematic diagram of a maintenance strategy of a modular multilevel converter based on online monitoring;
FIG. 4 is a diagram illustrating a conventional periodical maintenance simulation result;
FIG. 5 is a schematic diagram of a simulation result of a maintenance strategy of a modular multilevel converter based on-line monitoring;
FIG. 6 is a flow chart of a maintenance method of a modular multilevel converter based on-line monitoring according to the present invention;
fig. 7 is a block diagram of a modular multilevel converter maintenance system based on online monitoring according to the invention.
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a maintenance method and a maintenance system of a modular multilevel converter based on online monitoring, which can flexibly select the maintenance time without being limited by a fixed time period, can measure the number of fault submodules in real time by utilizing the online monitoring, and flexibly select the maintenance time based on the quantity, thereby improving the reliability of the system.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a maintenance method of a modular multilevel converter based on-line monitoring, which comprises the following steps of:
step 601: obtaining failure quantity maintenance thresholds of working sub-modules of each bridge arm in the modular multilevel converter, wherein the bridge arm comprises the working sub-modules and redundant sub-modules;
step 602: acquiring the number of the work submodules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm;
step 603: obtaining the maximum value in the number of the accumulated failed working submodules;
step 604: judging whether the maximum value reaches the maintenance threshold value of the failure number of the working sub-modules;
step 605: if so, performing shutdown maintenance on the modular multilevel converter;
step 606: after the maintenance is finished, step 602 is skipped to obtain the number of the work sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm.
Wherein, step 601 specifically includes:
according to actual engineering (taking MMC of 6 bridge arms as an example), obtaining the total number a of sub-modules of a single bridge arm, the number u of redundant sub-modules and a maintenance threshold r of the number of sub-module failures (for example, the number can be 80 percent of the number u of redundant sub-modules);
specifically, the modular multilevel converter generally has 6 bridge arms, each bridge arm is formed by cascading a plurality of identical sub-modules, and the topological structure of the sub-modules is shown in the right-side box of fig. 1. The redundant module is not put into operation under normal conditions, and when the submodule which normally works fails, the redundant submodule can be put into operation to replace the submodule which fails to complete the corresponding function.
Step 602 specifically includes:
utilizing an MMC online monitoring system to perform online monitoring on the number of submodules which fail in real time of 6 bridge arms respectively, and measuring the number x of the submodules which fail cumulatively of each bridge arm1、x2、x3、x4、x5、x6. The on-line monitoring system utilizes an advanced sensing device to monitor the state of the working submodule in real time, and the monitored physical quantities comprise the temperature of a submodule switch module (the switch module refers to a bypass switch of the submodule and belongs to a part of the submodule), trigger signals of an IGBT (insulated gate bipolar translator), capacitance voltage and other physical quantities; and then comparing the physical quantities with parameter thresholds monitored by the operation of the sub-modules, and when a certain physical quantity of a certain sub-module exceeds the range of the parameter threshold, determining that the sub-module has a fault and needs to quit the operation. The on-line monitoring system transmits the information to the control system, and the control system sends a closing signal to the bypass switch of the fault submodule to close the bypass switch, so that the fault submodule is quitted from operation; meanwhile, the control system sends a disconnection signal to a bypass switch of a certain redundant submodule, and the submodule is put into operation. Meanwhile, the number x of accumulated failure submodules corresponding to the bridge armiThe value of (a) is increased by 1;
step 603-:
on-line monitoring system compares the number x of 6 bridge arm accumulative failure sub-modules in real time1、x2、x3、x4、x5、x6Taking the x with the largest value among the 6 physical quantitiesmaxTo represent the real-time status of the modular multilevel converterWhen x ismaxWhen the number of the sub-modules reaches a maintenance threshold r of the number of the sub-modules in failure, the MMC is considered to reach the time needing shutdown maintenance, the online monitoring system sends out a signal for alarming to the fact that shutdown maintenance is needed, and workers perform shutdown maintenance on the MMC; when x ismaxWhen the sub-module failure number maintenance threshold r is not reached, the system continues to operate;
during maintenance, a worker replaces all the sub-modules with faults of 6 bridge arms with brand-new ones, namely x1、x2、x3、x4、x5、x6All the values are reset to 0, and the MMC is put into operation again after the maintenance is finished.
In addition, the present invention also discloses a modular multilevel converter maintenance system based on online monitoring, as shown in fig. 7, including:
the first data acquisition module 701 is used for acquiring failure quantity maintenance thresholds of working sub-modules of each bridge arm in the modular multilevel converter, wherein each bridge arm comprises a working sub-module and a redundant sub-module;
a second data obtaining module 702, configured to obtain the number of work submodules accumulated to fail from the last shutdown maintenance in each bridge arm;
a third data obtaining module 703, configured to obtain a maximum value in the number of the cumulative failed work submodules;
a judging module 704, configured to judge whether the maximum value reaches a maintenance threshold of the failure number of the working sub-module;
a shutdown maintenance module 705, configured to perform shutdown maintenance on the modular multilevel converter when the maximum value reaches a maintenance threshold of the number of failures of the working sub-modules;
and the skipping module 706 is used for skipping to the step to obtain the number of the working sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm after the maintenance is finished.
The invention also discloses the following technical effects:
the invention can flexibly select the maintenance time, thereby improving the reliability of the system, and the simulation verifies that the invention is more reliable compared with the traditional maintenance method, such as fig. 4 and fig. 5.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A maintenance method of a modular multilevel converter based on-line monitoring is characterized by comprising the following steps:
obtaining failure quantity maintenance thresholds of working sub-modules of each bridge arm in the modular multilevel converter, wherein the bridge arm comprises the working sub-modules and redundant sub-modules;
acquiring the number of the work submodules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm; acquiring the number of the work sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm by adopting an online monitoring system of the modular multilevel converter;
obtaining the maximum value in the number of the accumulated failed working submodules;
judging whether the maximum value reaches the maintenance threshold value of the failure number of the working sub-modules;
if so, performing shutdown maintenance on the modular multilevel converter;
and after the maintenance is finished, jumping to the step to obtain the number of the work sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm.
2. The on-line monitoring based maintenance method for the modular multilevel converter according to claim 1, wherein the maintenance threshold value of the failure number of the working sub-modules of each bridge arm is 80% of the number of the redundant sub-modules in the corresponding bridge arm.
3. The maintenance method of the modular multilevel converter based on the on-line monitoring as claimed in claim 1, wherein the calculation process of the number of the working submodules accumulated to be failed from the last shutdown maintenance in each bridge arm comprises:
obtaining working parameters of working submodules in each bridge arm;
judging whether the working parameters exceed a monitoring threshold value;
if yes, the working sub-module is a fault sub-module, and a bypass switch of the fault sub-module is controlled to be closed;
obtaining a bridge arm where the fault sub-module is located;
controlling a bypass switch of a certain redundant sub-module in the bridge arm to be disconnected;
and adding 1 to the number of the accumulated failed working submodules in the bridge arm.
4. The on-line monitoring based modular multilevel converter maintenance method according to claim 3, wherein the operating parameters comprise: the temperature of the bypass switch of the working submodule, the trigger signal of the IGBT and the capacitor voltage.
5. The on-line monitoring based modular multilevel converter maintenance method according to claim 4, wherein the determining whether the operating parameter exceeds a monitoring threshold comprises:
and when a certain working parameter of a certain working submodule exceeds a monitoring threshold value, the working submodule is a fault submodule.
6. The on-line monitoring based modular multilevel converter maintenance method according to claim 1, wherein the shutdown maintenance of the modular multilevel converter comprises:
replacing all failed submodules of each bridge arm with brand-new submodules;
the values for the number of submodules that have accumulated failures are all reset to 0.
7. The on-line monitoring based modular multilevel converter maintenance method according to claim 1, wherein the modular multilevel converter comprises 6 bridge arms.
8. A modular multilevel converter maintenance system based on-line monitoring is characterized by comprising:
the first data acquisition module is used for acquiring failure quantity maintenance thresholds of working sub-modules of each bridge arm in the modular multilevel converter, and each bridge arm comprises a working sub-module and a redundant sub-module;
the second data acquisition module is used for acquiring the number of the work submodules which are accumulated to be invalid in each bridge arm from the last shutdown maintenance; acquiring the number of the work sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm by adopting an online monitoring system of the modular multilevel converter;
the third data acquisition module is used for acquiring the maximum value in the number of the accumulated failed working sub-modules;
the judging module is used for judging whether the maximum value reaches the failure quantity maintenance threshold value of the working sub-modules;
the shutdown maintenance module is used for performing shutdown maintenance on the modular multilevel converter when the maximum value reaches a maintenance threshold value of the failure number of the working sub-modules;
and the skipping module is used for skipping to the step to obtain the number of the working sub-modules which are accumulated to be invalid from the last shutdown maintenance in each bridge arm after the maintenance is finished.
9. The on-line monitoring based modular multilevel converter maintenance system of claim 8, wherein the second data acquisition module comprises:
the working parameter acquisition unit is used for acquiring the working parameters of the working submodules in the bridge arms;
the working parameter judging unit is used for judging whether the working parameter exceeds a monitoring threshold value;
the first control unit is used for controlling a bypass switch of the fault sub-module to be closed when the working parameter exceeds a monitoring threshold value and the working sub-module is a fault sub-module;
the bridge arm acquisition unit is used for acquiring a bridge arm where the fault sub-module is located;
the second control unit is used for controlling the bypass switch of a certain redundant submodule in the bridge arm to be switched off;
and the accumulation unit is used for adding 1 to the number of the accumulated failed working submodules in the bridge arm.
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