CN109004853A - The submodule state monitoring method and device of modularization multi-level converter - Google Patents
The submodule state monitoring method and device of modularization multi-level converter Download PDFInfo
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- CN109004853A CN109004853A CN201810840499.5A CN201810840499A CN109004853A CN 109004853 A CN109004853 A CN 109004853A CN 201810840499 A CN201810840499 A CN 201810840499A CN 109004853 A CN109004853 A CN 109004853A
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- capacitor
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- sampling period
- capacity
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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
-
- 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
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The present invention relates to a kind of submodule state monitoring methods of modularization multi-level converter, this method are as follows: the situation of change of capacitor's capacity in the difference each submodule of real-time monitoring, to monitor the malfunction of each submodule according to the situation of change of capacitor's capacity in submodule.The method for monitoring the situation of change of capacitor's capacity in submodule are as follows: in each sampling period, judge the charging and discharging state of capacitor；In the charging process of capacitor, detect the bridge arm current in each sampling period, the charge capacity of capacitor is obtained to cumulative according to the bridge arm current in sampling period and each sampling period, the capacitance of capacitor is calculated further according to charge capacity, initial voltage, final voltage；Its situation of change is judged according to the capacitance of multiple calculated capacitor.The present invention can carry out comprehensive monitoring to the malfunction of submodule, provide auxiliary information for the operating maintenance of flexible direct current system, improve the specific aim of service work, improve the reliability of flexible direct current system.
Description
Technical field
The present invention relates to the submodules in a kind of pair of modular multilevel (MMC) inverter to carry out state monitoring method and dress
It sets.
Background technique
Flexible DC transmission uses voltage source converter, can exchange system with separately adjustable active and idle transmission, raising
The ability to transmit electricity of system, is readily configured multi-terminal direct current transmission system, the electricity generation grid-connecting of renewable energy, isolated island urban electricity supply and
The application fields such as AC system interconnection, have apparent competitiveness.
There are extensive use, the MMC change of current using the flexible direct current technology of modular multilevel (MMC) inverter technology at present
The characteristics of device to be composed in series single bridge arm using several submodules with same or similar topology, to realize voltage and appearance
The extension of amount.Wherein the failure of redundancy submodule will not influence the operation of whole system, but submodule individual has differences
Property, the electric current and voltage that main component IGBT and capacitor in each submodule are born will be different, and if things go on like this lead to son
The probability of failure of module will be different.
Therefore, it for the submodule in the flexible HVDC transmission system based on modular multilevel (MMC) inverter, needs
Fault state monitoring is carried out, to provide auxiliary information for the operating maintenance of flexible direct current system.
Summary of the invention
The object of the present invention is to provide the malfunctions that one kind can monitor submodule, to be the fortune of flexible direct current system
Row maintenance provides the submodule state monitoring method of the modularization multi-level converter of auxiliary information.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of submodule state monitoring method of modularization multi-level converter, in monitoring modular multilevel converter
The state of multiple submodule, the submodule state monitoring method of the modularization multi-level converter are as follows: real-time monitoring is each respectively
The situation of change of capacitor's capacity in a submodule, to be monitored according to the situation of change of capacitor's capacity in the submodule
The malfunction of each submodule.
The method for monitoring the situation of change of capacitor's capacity in the submodule are as follows: in each sampling period, according to current
Capacitor described in switching tube state and bridge arm current walking direction when sampling period and a upper sampling period in the submodule
Charging and discharging state；The initial voltage that the capacitor is detected when the capacitor starts to charge, the inspection when the capacitor exits charging
Survey the final voltage of the capacitor；In the charging process of the capacitor, the bridge arm electricity in each sampling period is detected
Stream, so that cumulative according to the bridge arm current in the sampling period and each sampling period obtain the capacitor
Charge capacity, the appearance of the capacitor is calculated further according to the charge capacity, the initial voltage, the final voltage
Value；Its situation of change is judged according to the capacitance of the multiple calculated capacitor.
Judge the method for the charging and discharging state of the capacitor are as follows: set Rule of judgment and close as the switching tube in the submodule
The disconnected and described bridge arm current direction is charging direction；If current sample period met the Rule of judgment and a upper sampling period
It is unsatisfactory for the Rule of judgment, then the capacitor is started to charge in current sample period；If current sample period is sentenced described in meeting
A broken strip part and upper sampling period also meets the Rule of judgment, then judge that the capacitor persistently charges in current sample period；
If current sample period is unsatisfactory for the Rule of judgment and a upper sampling period meets the Rule of judgment, the capacitor is being worked as
The preceding sampling period exits charging.
In the sampling period that the capacitor starts to charge, according to SUM=SUM1=I0* T calculates the charge capacity of the capacitor
SUM, wherein SUM1Accumulative charge capacity when the sampling period started to charge for the capacitor, I0The appearance starts to charge
Bridge arm current in sampling period, T are the sampling period；In n-th of sampling period of the capacitor charging, n is whole greater than 1
Number, according to SUM=SUMn=SUMn-1+In* T calculates the charge capacity SUM of the capacitor, wherein SUMnIt is the capacitor from starting to fill
Accumulative charge capacity when electricity to n-th of sampling period, InFor the bridge arm current in n-th of sampling period.
According to C=SUM/ (U1-U0) calculating the capacitance C of the capacitor, wherein SUM is the charge capacity of the capacitor, U0For
The initial voltage, U1For the final voltage.
Circulation carries out the calculating of the capacitor's capacity to each submodule.
The record charging time started when the capacitor starts to charge, when the capacitor exits charging, record charging is exited
Time.
The curve changed over time according to the capacitance that the capacitance that the capacitor is calculated describes the capacitor is to monitor
State the situation of change of capacitor's capacity in submodule.
The present invention also provides a kind of submodule state monitoring apparatus of modularization multi-level converter, including with the submodule
Block communicates and the acquisition module of acquisition state parameter, is connected with the acquisition module and realizes according to the state parameter
Monitoring to capacitor's capacity in the submodule and obtain the processor of monitoring result, be connected with the processor and based on institute
State the mark module that monitoring result indicates each submodule.
The acquisition module includes the state acquisition device for the switching tube state in the submodule that acquires, the acquisition submodule
Initial voltage when capacitor described in bridge arm current direction and the current collector of size, the acquisition submodule starts to charge
With the voltage collector of final voltage when exiting charging.
Due to the above technical solutions, the present invention has the following advantages over the prior art: the present invention being capable of antithetical phrase
The malfunction of module carries out comprehensive monitoring, so that the operating maintenance for flexible direct current system provides auxiliary information, improves flexible
The specific aim of direct current system service work improves the reliability of flexible direct current system, to the work of the flexible direct current system based on MMC
Cheng Yingyong is of great significance.
Detailed description of the invention
Attached drawing 1 is the flow diagram of the submodule state monitoring method of modularization multi-level converter of the invention.
Specific embodiment
The invention will be further described for embodiment shown in reference to the accompanying drawing.
It include multiple submodule in modularization multi-level converter, difference existing for the capacitance of storage capacitor in submodule,
The electric current that each IGBT can be made to bear with capacitor and voltage difference, if things go on like this, cause the probability of failure of submodule different,
And storage capacitor generally uses the metal oxide film capacitor with automatic recovery ability, with breakdown rear automatic recovery, capacitance also can
Change.Therefore, the capacitance situation of change for monitoring storage capacitor both can judge whether the state of submodule occurs in turn
It is abnormal.
It, can be using the submodule state monitoring method of following modularization multi-level converter come monitoring modular based on this
The state of multiple submodule in multilevel converter.The submodule state monitoring method of the modularization multi-level converter are as follows:
The situation of change of capacitor's capacity in the difference each submodule of real-time monitoring, thus according to the situation of change of capacitor's capacity in submodule
To monitor the malfunction of each submodule.
As shown in Fig. 1, the method for the situation of change of capacitor's capacity in submodule is monitored are as follows: default sampling period T, every
In a sampling period, the charging and discharging state of capacitor in judging submodule, to calculate capacitor appearance according to the charging process of capacitor
Value.Specifically, according to switching tube (module down tube) state and bridge in submodule when current sample period and a upper sampling period
Arm current direction judges the charging and discharging state of capacitor.That is: set Rule of judgment as in submodule switching tube shutdown and bridge arm
Current direction is charging direction.If current sample period meets Rule of judgment and a upper sampling period is unsatisfactory for Rule of judgment,
Capacitor is started to charge in current sample period；If current sample period meets Rule of judgment and a upper sampling period also meets judgement
Condition then judges that capacitor persistently charges in current sample period；If current sample period is unsatisfactory for Rule of judgment and a upper sampling
Period meets Rule of judgment, then capacitor exits charging in current sample period.When judging that capacitor starts to charge, need to detect
The initial voltage U of capacitor0, and when judging that capacitor exits charging, need to monitor the final voltage U of capacitor1.And in capacitor
Charging process in each sampling period in, i.e., by starting to charge to during exiting charging, then need to detect each adopt
Bridge arm current in the sample period, so that cumulative according to the bridge arm current in sampling period and each sampling period obtain capacitor
Charge capacity.
Specifically, in that sampling period that capacitor starts to charge, i.e., in the sampling period of the 1st of capacitor charging, according to
SUM=SUM1=I0* T calculates the charge capacity SUM of capacitor, wherein SUM1The accumulative when sampling period started to charge for capacitor is filled
Power consumption, I0To hold the bridge arm current in the sampling period started to charge, T is the sampling period.In n-th of sampling of capacitor charging
In period, n is the integer greater than 1, then according to SUM=SUMn=SUMn-1+In* T calculates the charge capacity SUM of capacitor, wherein SUMn
Accumulative charge capacity when for capacitor from starting to charge to n-th of sampling period, InFor the bridge arm electricity in n-th of sampling period
Stream.In this way until capacitor exits charging, so that it may which cumulative calculation goes out the charge capacity SUM of capacitor in entire charging process, i.e., extremely
The accumulative charge capacity that the last one charge cycle of capacitor obtains is the charge capacity SUM of capacitor in entire charging process.
Then, further according to the charge capacity SUM of capacitor, initial voltage U in entire charging process0, final voltage U1Capacitor is calculated
Capacitance C, i.e., according to C=SUM/ (U1-U0) calculate capacitor capacitance C.It is calculated corresponding charge capacity after capacitor's capacity C every time
SUM is reset so that next time calculates.It, can be according to repeatedly calculating after repeatedly calculating its capacitor then for the same submodule
The capacitance of capacitor judge its situation of change, so that the malfunction of submodule is surveyed, when the capacitor's capacity of some submodule occurs
When anomalous variation, then show that the likelihood of failure of the submodule improves.
Since each submodule is required to the variation of monitoring capacitor's capacity, it is therefore possible to use endless form is come to each
Submodule carries out the calculating of capacitor's capacity, that is, circuits sequentially and carry out charging and discharging state judgement to each submodule, and fill exiting
Its capacitance is calculated after electricity.
In addition, charging time started T can also be recorded when capacitor starts to charge0, when capacitor exits charging, record
Charge exit time T1。
Each submodule can also be changed over time according to the capacitance that the capacitance that capacitor is calculated describes capacitor respectively
Curve monitor the situation of change of capacitor's capacity in submodule, than one group capacitor's capacity data more intuitively embody capacitor appearance
The situation of change of value.
The son that the submodule state monitoring method of the above modularization multi-level converter passes through modularization multi-level converter
Module status monitoring device is realized.The submodule state monitoring apparatus of the modularization multi-level converter include: acquisition module,
Processor and mark module.
Acquisition module and submodule communicate and acquisition state parameter, it includes the shape for acquiring switching tube state in submodule
State collector, acquisition submodule bridge arm current direction and size current collector, acquisition submodule in capacitor start to charge
When initial voltage and final voltage when exiting charging voltage collector.
Processor is connected with acquisition module, for realizing the monitoring to capacitor's capacity in submodule according to state parameter
And obtaining monitoring result, i.e., above method process programs realization in the processor.
Mark module is connected with processor, for indicating the malfunction of each submodule based on monitoring result.
The submodule state monitoring apparatus of above-mentioned modularization multi-level converter can integrate at modular multilevel (MMC)
In inverter.
For the present invention by the real-time monitoring changed to sub- module capacitance capacitance, can filter out has higher likelihood of failure
Submodule improve the reliability of flexible direct current system to improve the specific aim of flexible direct current system service work, to being based on
The engineer application of the flexible direct current system of MMC is of great significance.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (10)
1. the submodule state monitoring method of a kind of modularization multi-level converter, in monitoring modular multilevel converter
Multiple submodule state, it is characterised in that: the submodule state monitoring method of the modularization multi-level converter are as follows: point
The situation of change of capacitor's capacity in the other each submodule of real-time monitoring, thus according to the change of capacitor's capacity in the submodule
Change situation to monitor the malfunction of each submodule.
2. the submodule state monitoring method of modularization multi-level converter according to claim 1, it is characterised in that: prison
The method for surveying the situation of change of capacitor's capacity in the submodule are as follows: in each sampling period, according to current sample period and
The charging and discharging state of capacitor described in switching tube state and bridge arm current walking direction when a upper sampling period in the submodule；
The initial voltage that the capacitor is detected when the capacitor starts to charge detects the capacitor when the capacitor exits charging
Final voltage；In the charging process of the capacitor, the bridge arm current in each sampling period is detected, thus according to institute
State sampling period and the bridge arm current in each sampling period and it is cumulative obtain the charge capacity of the capacitor, then
The capacitance of the capacitor is calculated according to the charge capacity, the initial voltage, the final voltage；It is calculated according to multiple
The capacitance of the capacitor out judges its situation of change.
3. the submodule state monitoring method of modularization multi-level converter according to claim 2, it is characterised in that: sentence
Break the capacitor charging and discharging state method are as follows: set Rule of judgment as in the submodule switching tube shutdown and it is described
Bridge arm current direction is charging direction；If current sample period meet the Rule of judgment and a upper sampling period be unsatisfactory for it is described
Rule of judgment, then the capacitor is started to charge in current sample period；If current sample period meet the Rule of judgment and on
One sampling period also met the Rule of judgment, then judged that the capacitor persistently charges in current sample period；If present sample
Period is unsatisfactory for the Rule of judgment and a upper sampling period meets the Rule of judgment, then the capacitor is in current sample period
Exit charging.
4. the submodule state monitoring method of modularization multi-level converter according to claim 2, it is characterised in that:
In the sampling period that the capacitor starts to charge, according to SUM=SUM1=I0* T calculates the charge capacity SUM of the capacitor, wherein
SUM1Accumulative charge capacity when the sampling period started to charge for the capacitor, I0Hold the sampling period started to charge to be described
In bridge arm current, T is the sampling period；In n-th of sampling period of the capacitor charging, n is the integer greater than 1, according to
SUM=SUMn=SUMn-1+In* T calculates the charge capacity SUM of the capacitor, wherein SUMnIt is the capacitor from starting to charge to n-th
Accumulative charge capacity when a sampling period, InFor the bridge arm current in n-th of sampling period.
5. the submodule state monitoring method of modularization multi-level converter according to claim 2, it is characterised in that: root
According to C=SUM/ (U1-U0) calculating the capacitance C of the capacitor, wherein SUM is the charge capacity of the capacitor, U0For the initial electricity
Pressure, U1For the final voltage.
6. the submodule state monitoring method of modularization multi-level converter according to claim 2, it is characterised in that: follow
Ring carries out the calculating of the capacitor's capacity to each submodule.
7. the submodule state monitoring method of modularization multi-level converter according to claim 2, it is characterised in that: when
Record charging time started when the capacitor starts to charge, the record charging exit time when the capacitor exits charging.
8. the submodule state monitoring method of modularization multi-level converter according to claim 2, it is characterised in that: root
It is monitored according to the curve that the capacitance that the capacitance that the capacitor is calculated describes the capacitor changes over time in the submodule
The situation of change of capacitor's capacity.
9. a kind of submodule state monitoring apparatus of modularization multi-level converter, it is characterised in that: the modular multilevel
The submodule state monitoring apparatus of inverter includes communicating and the acquisition module of acquisition state parameter and institute with the submodule
Acquisition module is stated to be connected and realized according to the state parameter to the monitoring of capacitor's capacity in the submodule and supervised
It surveys the processor of result, be connected and indicate based on the monitoring result mark mould of each submodule with the processor
Block.
10. the submodule state monitoring method of modularization multi-level converter according to claim 9, it is characterised in that:
The acquisition module includes the state acquisition device for the switching tube state in the submodule that acquires, the acquisition submodule bridge arm electricity
The current collector of stream direction and size acquires initial voltage when capacitor described in the submodule starts to charge and exits and fills
The voltage collector of final voltage when electric.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068758A (en) * | 2019-04-22 | 2019-07-30 | 南方电网科学研究院有限责任公司 | Flexible direct current converter valve monitoring diagnosis system |
| CN110187190A (en) * | 2019-05-27 | 2019-08-30 | 许昌许继风电科技有限公司 | The evaluation method and detection system of capacitor box capacitance |
| CN110995036A (en) * | 2019-11-12 | 2020-04-10 | 东南大学 | Capacitance monitoring method of modular multilevel converter based on full-bridge submodule |
| CN111384843A (en) * | 2020-04-02 | 2020-07-07 | 华北电力大学 | MMC maintenance period determination method and system based on submodule state monitoring |
| CN112332672A (en) * | 2020-10-20 | 2021-02-05 | 合肥工业大学 | Input series modular DC-DC converter input capacitance state monitoring method |
| CN113138351A (en) * | 2021-04-20 | 2021-07-20 | 东南大学 | Modular multilevel converter capacitor monitoring method based on sub-module input time |
| CN114113798A (en) * | 2021-11-08 | 2022-03-01 | 国网浙江省电力有限公司舟山供电公司 | Flexible direct current converter valve submodule direct current capacitor fault online detection method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738562A (en) * | 2008-11-07 | 2010-06-16 | 英业达股份有限公司 | Electric detection system for interface card |
| CN103490726A (en) * | 2013-09-25 | 2014-01-01 | 无锡中星微电子有限公司 | Low-voltage oscillator |
| CN103546045A (en) * | 2013-10-28 | 2014-01-29 | 中国东方电气集团有限公司 | Method for calculating capacitance value of direct current capacitor of three-phase uncontrolled rectifying device |
| CN104199997A (en) * | 2014-07-16 | 2014-12-10 | 华北电力大学 | Designing method of MMC multi-sub-module user-defined integrated component |
| CN105375801A (en) * | 2015-10-30 | 2016-03-02 | 南方电网科学研究院有限责任公司 | Modular multilevel converter voltage-sharing control method |
| CN106026157A (en) * | 2016-06-13 | 2016-10-12 | 许继集团有限公司 | Failure prediction method and device of flexible direct-current transmission convertor valve sub-module |
| CN106058930A (en) * | 2016-07-06 | 2016-10-26 | 许继集团有限公司 | Automatic detecting system and automatic detecting method for capacitance of photovoltaic grid-connected inverter bus capacitor |
| CN108152623A (en) * | 2017-12-18 | 2018-06-12 | 西安交通大学 | A kind of on-line monitoring method of Modularized multi-level converter sub-module capacitor |
| US20180166972A1 (en) * | 2016-12-14 | 2018-06-14 | Abb Schweiz Ag | Fault isolation and system restoration using power converter |
-
2018
- 2018-07-27 CN CN201810840499.5A patent/CN109004853B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738562A (en) * | 2008-11-07 | 2010-06-16 | 英业达股份有限公司 | Electric detection system for interface card |
| CN103490726A (en) * | 2013-09-25 | 2014-01-01 | 无锡中星微电子有限公司 | Low-voltage oscillator |
| CN103546045A (en) * | 2013-10-28 | 2014-01-29 | 中国东方电气集团有限公司 | Method for calculating capacitance value of direct current capacitor of three-phase uncontrolled rectifying device |
| CN104199997A (en) * | 2014-07-16 | 2014-12-10 | 华北电力大学 | Designing method of MMC multi-sub-module user-defined integrated component |
| CN105375801A (en) * | 2015-10-30 | 2016-03-02 | 南方电网科学研究院有限责任公司 | Modular multilevel converter voltage-sharing control method |
| CN106026157A (en) * | 2016-06-13 | 2016-10-12 | 许继集团有限公司 | Failure prediction method and device of flexible direct-current transmission convertor valve sub-module |
| CN106058930A (en) * | 2016-07-06 | 2016-10-26 | 许继集团有限公司 | Automatic detecting system and automatic detecting method for capacitance of photovoltaic grid-connected inverter bus capacitor |
| US20180166972A1 (en) * | 2016-12-14 | 2018-06-14 | Abb Schweiz Ag | Fault isolation and system restoration using power converter |
| CN108152623A (en) * | 2017-12-18 | 2018-06-12 | 西安交通大学 | A kind of on-line monitoring method of Modularized multi-level converter sub-module capacitor |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068758A (en) * | 2019-04-22 | 2019-07-30 | 南方电网科学研究院有限责任公司 | Flexible direct current converter valve monitoring diagnosis system |
| CN110068758B (en) * | 2019-04-22 | 2021-08-03 | 南方电网科学研究院有限责任公司 | Flexible direct current converter valve monitoring and diagnosing system |
| CN110187190A (en) * | 2019-05-27 | 2019-08-30 | 许昌许继风电科技有限公司 | The evaluation method and detection system of capacitor box capacitance |
| CN110995036A (en) * | 2019-11-12 | 2020-04-10 | 东南大学 | Capacitance monitoring method of modular multilevel converter based on full-bridge submodule |
| CN110995036B (en) * | 2019-11-12 | 2021-06-01 | 东南大学 | Capacitance monitoring method of modular multilevel converter based on full-bridge submodule |
| CN111384843A (en) * | 2020-04-02 | 2020-07-07 | 华北电力大学 | MMC maintenance period determination method and system based on submodule state monitoring |
| CN112332672A (en) * | 2020-10-20 | 2021-02-05 | 合肥工业大学 | Input series modular DC-DC converter input capacitance state monitoring method |
| CN112332672B (en) * | 2020-10-20 | 2021-11-26 | 合肥工业大学 | Input series modular DC-DC converter input capacitance state monitoring method |
| CN113138351A (en) * | 2021-04-20 | 2021-07-20 | 东南大学 | Modular multilevel converter capacitor monitoring method based on sub-module input time |
| CN114113798A (en) * | 2021-11-08 | 2022-03-01 | 国网浙江省电力有限公司舟山供电公司 | Flexible direct current converter valve submodule direct current capacitor fault online detection method |
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| CN109004853B (en) | 2019-11-15 |
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