CN109188144A - A kind of capacitance aging on-line monitoring method of Modularized multi-level converter sub-module - Google Patents
A kind of capacitance aging on-line monitoring method of Modularized multi-level converter sub-module Download PDFInfo
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- CN109188144A CN109188144A CN201811108163.6A CN201811108163A CN109188144A CN 109188144 A CN109188144 A CN 109188144A CN 201811108163 A CN201811108163 A CN 201811108163A CN 109188144 A CN109188144 A CN 109188144A
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Abstract
The present invention provides a kind of capacitance aging on-line monitoring method of Modularized multi-level converter sub-module comprising following steps: S1, data selection: switch function S of the acquisition submodule in a period of time m Δ ti, bridge arm current iarm, wherein Δ t is the control period of inverter, and m is the data amount check of continuous acquisition, works as SiWhen=1, submodule investment；SiWhen=0, submodule excision；I=1,2,3 ... n represent n submodule；S2, Characteristic Extraction: the data acquired according to step S1 judge the direction of bridge arm current and the switching state of submodule, calculate the switching frequency f of each submodule, two characteristic quantities of ratio λ that number is connected with discharge condition for number are connected in charged state；S3, ageing state judgement: the characteristic quantity being calculated according to step S2, the characteristic quantity size of more each submodule judge the opposite degree of aging of each submodule, and identification is abnormal the submodule of aging, its aging of the bigger submodule of characteristic quantity is more serious.
Description
Technical field
The present invention relates to transmission & distribution electro-technical fields, old more particularly to a kind of Modularized multi-level converter sub-module capacitor
Change on-line monitoring method.
Background technique
Modularization multi-level converter is the flexible direct-current transmission converter being widely used at present, Modular Structure Design
The characteristics of can flexibly realize the output of more level, the harmonic content of alternating voltage is greatly reduced, reduces the investment of filter, together
When it uses the wholly-controled devices such as IGBT, the decoupling control of active reactive may be implemented.Submodule capacitor is modular multilevel
Highly important element in inverter plays a part of maintaining submodule both end voltage, once capacitor failure, can make each
Difference occurs for the state of submodule, influences the performance of inverter.Modularized multi-level converter sub-module capacitor failure is main
Including capacitor open-circuit failure, short trouble and aging.The research about submodule condenser failure is concentrated mainly on capacitor at present
Using failure the variation of momentary capacitance voltage and current waveform occurs for the diagnosis of the open circuit of device and short-circuit two kinds of failures to realize event
Barrier detection and positioning.The detection and positioning capacitance aging for submodule does not have discussion also at present, for capacitor, in mistake
It in the case that high temperature, humidity are with overcurrent overvoltage, can all make to gradually appear aging, its capacitance is caused to reduce, is equivalent
Series impedance increases, and different from open circuit and short trouble, aging is the slowly varying process of a parameter, will not give system band
The mutation for carrying out instantaneous parameters, the influence to voltage, current waveform is unobvious, so to the fault diagnosis of capacitor short-circuit and open circuit
Method is not particularly suited for capacitance aging.
It is capacitance aging equivalent series impedance to be made to increase, cause calorific value to increase, temperature increases, in turn speed-up capacitor
Aging forms vicious circle.When aging occurs for molecular modules capacitor in the middle part of MMC, such vicious circle can accelerate submodule
The aging of middle capacitor and switching device brings hidden danger to converter station operation.Therefore for MMC, it is more serious to reduce aging
Capacitor runing time, the ageing state of submodule capacitor, can extend equipment to a certain extent on a balanced bridge arm
Service life.And to realize this point, it is only necessary to the opposite degree of aging between each submodule capacitor is known, as tool
The capacitance of body can obtain more accurate result using the method for off-line measurement in equipment periodic inspection completely.
Summary of the invention
In order to overcome the drawbacks of the prior art, it is more to provide a kind of modularization based on submodule history switching information by the present invention
The capacitance aging on-line monitoring method of level converter submodule, with the direction of the switch function of submodule history and bridge arm current work
For data, the accumulative conducting number of submodule is extracted, ratio two of number are connected with discharge condition for charged state conducting number
Characteristic quantity judges the opposite degree of aging of capacitor by the comparison of different submodule characteristic quantities, distinguishes the more serious electricity of aging
Hold.
Specifically, the present invention provides a kind of capacitance aging on-line monitoring method of Modularized multi-level converter sub-module,
The following steps are included:
S1, data selection: the switch function S of submodule is acquired in scheduled duration m Δ ti, bridge arm current iarm, inverter
The control period be Δ t, collect the data of continuous m point altogether, wherein SiWhen=1, submodule investment；SiWhen=0, submodule
Excision；I=1,2,3 ... n represent n submodule；
S2, Characteristic Extraction: the data acquired according to step S1 judge the direction of bridge arm current and the switching shape of submodule
State calculates the switching frequency f of each submodule, two spies of ratio λ that number is connected with discharge condition for number are connected in charged state
Sign amount；
S3, ageing state judgement: the characteristic quantity being calculated according to step S2, the characteristic quantity size of more each submodule,
Judge the opposite degree of aging of each submodule, identification is abnormal the submodule of aging, its aging of the bigger submodule of characteristic quantity
It is more serious.
Preferably, S2 the specific steps are (wherein subscript i indicate i-th of submodule, subscript j indicate acquisition j-th of number
According to a, b, c and x are the intermediate variable needed for calculating, and f is submodule switching frequency, and λ is that number and electric discharge shape is connected in charged state
The ratio of state conducting number):
S21, i=1 is enabled,
S22, the accumulative conducting number a of submodule is enabledi(0)=0, submodule charging conducting number bi(0)=0, submodule discharges
Number c is connectedi(0)=0, j=1,
S23, x=S is calculatedi(j+1)-Si(j), if x > 0, submodule conducting is primary, adds the accumulative conducting number of submodule
1, i.e. ai(j)=ai(j-1)+1,
If S24, iarmj> 0, i.e. bridge arm current are greater than 0, then capacitor is in charged state, make submodule charging conducting number
Add 1, i.e. bi(j)=bi(j-1)+1, if iarmj< 0, i.e. bridge arm current are less than 0, then capacitor is in discharge condition, put submodule
It conducts number and adds 1, i.e. ci(j)=ci(j-1)+1,
If S25, j=m, S26 is entered step, otherwise enables j add 1 in own foundation, and repeat step S23 to S25,
S26, according to intermediate variable a calculatedi(m)、bi(m)、ci(m) numerical value can obtain:
The switching frequency of submodule i
The ratio of number is connected with discharge condition for the charged state conducting number of submodule i
If S27, i=n, the characteristic quantity of all submodules has calculated completion, otherwise end step S2 enables i in itself base
Add 1 on plinth, and repeat S22 to S27, calculate the characteristic quantity of next submodule, until the characteristic quantity of all submodules has been calculated
At；
Wherein subscript i indicates that i-th of submodule, subscript j indicate j-th of data of acquisition, and a, b, c and x are needed for calculating
Intermediate variable, f is submodule switching frequency, and λ is that charged state is connected number the ratio of number is connected with discharge condition.
Preferably, a period of time m Δ t mentioned in S1, as Δ t=0.0001, i.e. converter Control frequency is 10kHz
When, the scheduled duration m Δ t in step S1 should be greater than or be equal to 0.5s, and corresponding m should be greater than being equal to 5000, as Δ t=
0.0002, i.e., when converter Control frequency is 5kHz, the scheduled duration m Δ t in step S1 should be not greater than or equal to 1s, corresponding
M should be greater than being equal to 5000.
Preferably, step S3 judges that capacitor is with respect to the method for ageing state, the switching frequency of more each submodule and
Charge and discharge conducts size of the number than two characteristic quantities, and switching frequency and charge and discharge conduct number ratio greater than switching frequency and charge and discharge
When conducting number than threshold value, corresponding submodule is capacitance aging serious, judges it for abnormal aging, switching frequency and charge and discharge
When conducting number than conducting number than threshold value less than switching frequency and charge and discharge greatly, corresponding submodule is capacitance aging more
Gently.
Compared with prior art, the invention has the following advantages:
The present invention is based on the operation logic of modularization multi-level converter, the switch function and bridge arm of statistic submodule
Current direction, therefrom extracts switching frequency and two features of ratio of number are connected with discharge condition for charged state conducting number
Amount, by the comparison of each submodule characteristic quantity size, the opposite ageing state of judging submodule capacitor identifies aging exception
Capacitor.The method achieve the on-line monitoring to sub- module capacitance ageing state, information collected is that modular multilevel changes
The calculated numerical value of institute in the capacitance voltage equilibrium measurement of device is flowed, so need to can only directly obtain institute from Converter controller
The initial data needed, does not need additionally to install monitoring device for each submodule, will not bring biggish economic cost.
Detailed description of the invention
Fig. 1 is the flow chart of submodule Characteristic Extraction method of the invention；
Fig. 2 be the control period when being 0.0001 charge and discharge conduct number than the variation relation with statistical time；
Fig. 3 be the control period when being 0.0002 charge and discharge conduct number than the variation relation with statistical time；
Fig. 4 is the relationship for implementing example Neutron module switching frequency and submodule capacitor decline percentage；
Fig. 5 is to implement the charge and discharge of example Neutron module to conduct number than the relationship with submodule capacitor decline percentage.
Specific embodiment
Below with reference to the attached drawing exemplary embodiment that the present invention will be described in detail, feature and aspect.It is identical attached in attached drawing
Icon note indicates element functionally identical or similar.Although the various aspects of embodiment are shown in the attached drawings, unless special
It does not point out, it is not necessary to attached drawing drawn to scale.
As shown in Figure 1, the present invention provides a kind of modularization multi-level converter electricity based on submodule history switching information
Hold aging on-line monitoring method, goes out submodule switching frequency, charged state conducting time using submodule history switching information extraction
Two characteristic quantities of ratio of number are connected with discharge condition for number, by the comparison of different submodule characteristic quantities, distinguish abnormal aging
Capacitor.It includes the following steps:
S1, data selection: the switch function S of submodule is acquired in scheduled duration m Δ ti, bridge arm current iarm, inverter
The control period be Δ t, collect the data of continuous m point altogether, wherein SiWhen=1, submodule investment；SiWhen=0, submodule
Excision；I=1,2,3 ... n represent n submodule；
S2, Characteristic Extraction: the data acquired according to step S1 judge the direction of bridge arm current and the switching shape of submodule
State calculates the switching frequency f of each submodule in the certain time, charged state is connected number and number is connected with discharge condition
Two characteristic quantities of ratio λ.Its step are as follows:
S21, i=1 is enabled,
S22, the accumulative conducting number a of submodule is enabledi(0)=0, submodule charging conducting number bi(0)=0, submodule discharges
Number c is connectedi(0)=0, j=1,
S23, x=S is calculatedi(j+1)-Si(j), if x > 0, submodule conducting is primary, adds the accumulative conducting number of submodule
1, i.e. ai(j)=ai(j-1)+1,
If S24, iarmj> 0, i.e. bridge arm current are greater than 0, then capacitor is in charged state, make submodule charging conducting number
Add 1, i.e. bi(j)=bi(j-1)+1, if bridge arm current on the contrary is less than 0, capacitor is in discharge condition, makes submodule electric discharge conducting
Number adds 1, i.e. ci(j)=ci(j-1)+1,
If S25, j=m, S26 is entered step, otherwise enables j add 1 in own foundation, and repeat step S23 to S25,
S26, according to intermediate variable a calculatedi(m)、bi(m)、ci(m) numerical value can obtain:
The switching frequency of submodule i
The ratio of number is connected with discharge condition for the charged state conducting number of submodule i
If S27, i=n, the characteristic quantity of all submodules has been had been calculated, otherwise end step S2 enables i in own foundation
It is upper to add 1, and S22 to S27 is repeated, the characteristic quantity of next submodule is calculated,
Wherein subscript i indicates that i-th of submodule, subscript j indicate j-th of data of acquisition, and a, b, c and x are needed for calculating
Intermediate variable, f is submodule switching frequency, and λ is that charged state is connected number the ratio of number is connected with discharge condition.
S3, ageing state judgement: the characteristic quantity being calculated according to step S2, the characteristic quantity size of more each submodule,
Judge the opposite degree of aging of each submodule, identification is abnormal the submodule of aging.Its aging of the bigger submodule of characteristic quantity
It is more serious.
During calculating, it is contemplated that requirement of the Practical Project to capacitance-age, the calculating knot of two characteristic quantities
Fruit is substantially both big or both small, therefore only enumerates the calculation method of above-mentioned two situations.
The system parameter of institute's constructing modular multilevel converter simulation model is as shown in table 1 in this implementation example, transmission
Active power is 2MW, reactive power 0.
Table 1MMC system parameter
It is statistic, the accuracy and statistical number of numerical value since switching frequency and charge and discharge conduct number ratio in the present invention
According to number it is related, therefore the built model of this implementation example is taken to be emulated, enable respectively the control period be 0.0001s and
0.0002s, and start statistical data at the 1s moment and calculate charge and discharge to conduct number ratio, it obtains charge and discharge and conducts number ratio and system
Relationship between timing.As shown in Figures 2 and 3, it can be seen that when controlling the period is 0.0001s, charge and discharge conducts number ratio
Start to tend towards stability after statistical time reaches 0.5s, when controlling the period is 0.0002s, charge and discharge conducts number ratio and exists
Statistical time starts to tend towards stability after reaching 1s.Based on this, in this implementation example, make to control period 0.0002s, data
Statistical time m Δ t is 1.5s.
The capacitance of bridge arm submodule 1 in a phase in modularization multi-level converter is gradually decreased, use is proposed by the invention
Capacitor on-line monitoring method, calculate 1.5s in submodule 1 switching frequency and charged state conducting number led with discharge condition
Two characteristic quantities of ratio of logical number, as a result as shown in Figure 4, Figure 5.As can be seen that number is connected in switching frequency and charged state
Be connected that two characteristic quantities of ratio of number first increase as the decline of capacitance is presented, the variation that reduces afterwards becomes with discharge condition
Gesture.It is generally acknowledged that capacitor is no longer valid when capacitance decrease beyond 20% in practical projects, therefore can be with by Fig. 4, Fig. 5
Think the trend that two characteristic quantities that the present invention is extracted increase with the decline presentation of capacitance, characteristic quantity means more greatly
Its capacitance is smaller, and aging is more serious.
The capacitance of bridge arm Neutron module 1 in a phase is enabled to decline 10% respectively, the capacitance of submodule 7 declines 30%, submodule
The capacitance decline 20% of block 15, remaining submodule capacitance keep normal.It is monitored on-line using capacitor proposed by the invention
Method calculates the ratio that number is connected with discharge condition for the switching frequency of each submodule and charged state conducting number in 1.5s
Two characteristic quantities, the results are shown in Table 2, it can be seen that the corresponding characteristic quantity of submodule that aging occurs for capacitor can be than normal submodule
The characteristic quantity of block is big, and the value of the more serious characteristic quantity of degree of aging is bigger.
The value of submodule characteristic quantity when 2 multiple submodule aging of table
Finally, it should be noted that above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to part of or all technical features into
Row equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (4)
1. a kind of capacitance aging on-line monitoring method of Modularized multi-level converter sub-module, it is characterised in that: it includes following
Step:
S1, data selection: the switch function S of submodule is acquired in scheduled duration m Δ ti, bridge arm current iarm, the control of inverter
Period processed is Δ t, collects the data of continuous m point altogether, wherein SiWhen=1, submodule investment；SiWhen=0, submodule is cut
It removes；I=1,2,3 ... n represent n submodule；
S2, Characteristic Extraction: the data acquired according to step S1 judge the direction of bridge arm current and the switching state of submodule,
Two spies of ratio λ of number are connected with discharge condition by the switching frequency f and charged state conducting number that calculate each submodule
Sign amount；
S3, ageing state judgement: aging value is obtained according to two characteristic quantities that step S2 is calculated, judges the phase of each submodule
The submodule, which is the son for being abnormal aging, to be judged when the aging value of some submodule is greater than aging threshold to degree of aging
Module.
2. the capacitance aging on-line monitoring method of Modularized multi-level converter sub-module according to claim 1, feature
It is: the specific steps of S2 are as follows:
S21, i=1 is enabled,
S22, the accumulative conducting number a of submodule is enabledi(0)=0, submodule charging conducting number bi(0)=0, submodule electric discharge conducting
Number ci(0)=0, j=1,
S23, x=S is calculatedi(j+1)-Si(j), if x > 0, submodule conducting is primary, so that the accumulative conducting number of submodule is added 1, i.e.,
ai(j)=ai(j-1)+1,
If S24, iarmj> 0, i.e. bridge arm current are greater than 0, then capacitor is in charged state, and submodule charging conducting number is made to add 1,
That is bi(j)=bi(j-1)+1, if iarmj< 0, i.e. bridge arm current are less than 0, then capacitor is in discharge condition, lead submodule electric discharge
Logical number adds 1, i.e. ci(j)=ci(j-1)+1,
If S25, j=m, S26 is entered step, otherwise enables j add 1 in own foundation, and repeat step S23 to S25,
S26, according to intermediate variable a calculatedi(m)、bi(m)、ci(m) numerical value can obtain:
The switching frequency of submodule i
The ratio of number is connected with discharge condition for the charged state conducting number of submodule i
If S27, i=n, the characteristic quantity of all submodules has calculated completion, otherwise end step S2 enables i in own foundation
Add 1, and repeat S22 to S27, calculate the characteristic quantity of next submodule, is completed until the characteristic quantity of all submodules calculates；
Wherein i-th of submodule of subscript i expression, subscript j indicate j-th of data of acquisition, and a, b, c and x are to calculate in required
Between variable, f is submodule switching frequency, and λ is that charged state is connected number the ratio of number is connected with discharge condition.
3. the capacitance aging on-line monitoring method of Modularized multi-level converter sub-module according to claim 1, feature
It is:
As Δ t=0.0001, i.e., when converter Control frequency is 10kHz, the scheduled duration m Δ t in step S1 should be greater than or wait
It should be greater than being equal to 5000 in 0.5s, corresponding m, as Δ t=0.0002, i.e., when converter Control frequency is 5kHz, in step S1
Scheduled duration m Δ t should be not greater than or equal to 1s, corresponding m should be greater than be equal to 5000.
4. the capacitance aging on-line monitoring method of Modularized multi-level converter sub-module according to claim 1, feature
Be: step S3 judges that capacitor is with respect to the method for ageing state, and the switching frequency of more each submodule and charge and discharge conduct
Than the size of two characteristic quantities, switching frequency and charge and discharge conduct number ratio and conduct number greater than switching frequency and charge and discharge number
When than threshold value, corresponding submodule is capacitance aging serious, judges it for abnormal aging, switching frequency and charge and discharge conduct number
When than conducting number than threshold value less than switching frequency and charge and discharge, corresponding submodule is capacitance aging lighter.
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| CN109921614A (en) * | 2019-03-12 | 2019-06-21 | 东南大学 | A kind of modularization multi-level converter capacitance state monitoring method based on sequence |
| CN110161395A (en) * | 2019-05-29 | 2019-08-23 | 苏州半唐电子有限公司 | The state of insulation on-line monitoring method and its monitoring system of inverter AC motor |
| 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 |
| CN114034934A (en) * | 2021-11-19 | 2022-02-11 | 特变电工西安柔性输配电有限公司 | HVDC-MMC system power module capacitance value on-line monitoring method |
| CN114264885A (en) * | 2021-12-03 | 2022-04-01 | 国网浙江省电力有限公司杭州供电公司 | Converter valve module capacitance online monitoring method based on sorting algorithm |
| CN115060992A (en) * | 2022-06-09 | 2022-09-16 | 福州大学 | MMC submodule capacitor aging detection method |
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| CN114034934A (en) * | 2021-11-19 | 2022-02-11 | 特变电工西安柔性输配电有限公司 | HVDC-MMC system power module capacitance value on-line monitoring method |
| CN114264885A (en) * | 2021-12-03 | 2022-04-01 | 国网浙江省电力有限公司杭州供电公司 | Converter valve module capacitance online monitoring method based on sorting algorithm |
| CN115060992A (en) * | 2022-06-09 | 2022-09-16 | 福州大学 | MMC submodule capacitor aging detection method |
| CN115060992B (en) * | 2022-06-09 | 2024-06-25 | 福州大学 | MMC submodule capacitor aging detection method |
| CN115792735A (en) * | 2022-11-28 | 2023-03-14 | 清华大学 | Method, device, equipment and medium for online diagnosis of direct current bus capacitor aging |
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