CN109001541A - A kind of the capacitance online test method and device of MMC submodule - Google Patents
A kind of the capacitance online test method and device of MMC submodule Download PDFInfo
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- CN109001541A CN109001541A CN201811050738.3A CN201811050738A CN109001541A CN 109001541 A CN109001541 A CN 109001541A CN 201811050738 A CN201811050738 A CN 201811050738A CN 109001541 A CN109001541 A CN 109001541A
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Abstract
This application discloses a kind of capacitance online test method of MMC submodule and devices, method includes: that 101, real-time reception MMC system is sent, first switch signal, first voltage signal and the first current signal of each MMC submodule operation in the MMC system；102, judge whether each first switch signal and the corresponding second switch signal of each first switch signal are shutdown signal, if, it then determines the first switch signal and the second switch signal be the submodule of shutdown signal is MMC submodule to be calculated, and step 103 is executed to each MMC submodule to be calculated；103, the detection capacitance of each MMC submodule to be calculated is obtained according to first voltage signal, the first current signal, second voltage signal and the second current signal of each MMC submodule to be calculated based on the first preset formula.Solving the existing detection to MMC submodule capacitance is all the technical issues of can not learning capacitance in real time by the way of off-line measurement.
Description
Technical field
The application belongs to power equipment monitoring technical field more particularly to a kind of capacitance on-line checking of MMC submodule
Method and device.
Background technique
Flexible DC transmission engineering system generally uses modularization multi-level converter (MMC), each bridge of inverter
Arm is all made of the identical sub-module cascade of multiple structures and constitutes.With the increase of the operation time limit, each component part of MMC submodule will
Gradually aging, runnability reduce, and then influence the power supply reliability of flexible DC transmission engineering.Therefore there is an urgent need to MMC
Submodule block device is monitored on-line, assesses the equipment running status of MMC submodule, in real time to ensure the normal operation of MMC.
Capacitor is important one of the component devices of MMC submodule, and capacitance is the characterisitic parameter of its degree of aging.Cause
This, carrying out on-line monitoring to the capacitance of capacitor helps to assess the degree of aging of entire MMC submodule.However at present
Detection to MMC submodule capacitance is all that can not learn capacitance in real time by the way of off-line measurement.
Summary of the invention
This application provides a kind of capacitance online test method of MMC submodule and devices, are used for flexible DC transmission
The capacitance monitoring of MMC submodule in engineering, solving the existing detection to MMC submodule capacitance all is using off-line measurement
Mode, the technical issues of can not learning capacitance in real time.
In view of this, the application first aspect provides a kind of capacitance online test method of MMC submodule, comprising:
101, real-time reception MMC system is sent, the first switch letter of each MMC submodule operation in the MMC system
Number, first voltage signal and the first current signal, the first switch signal is the switching signal at current time, first electricity
Pressing signal is the capacitance voltage signal at current time, and first current signal is the bridge arm current signal at current time；
102, judge each first switch signal and the corresponding second switch signal of each first switch signal
It whether is shutdown signal, if so, the determining first switch signal and the second switch signal are shutdown signal
Submodule is MMC submodule to be calculated, and executes step 103, the second switch letter to each MMC submodule to be calculated
Number be previous moment switching signal；
103, it is based on the first preset formula, according to the first voltage signal of each MMC submodule to be calculated, the first electricity
Signal, second voltage signal and the second current signal are flowed, the detection capacitance of each MMC submodule to be calculated, institute are obtained
The capacitance voltage signal that second voltage signal is previous moment is stated, second current signal is that the bridge arm current of previous moment is believed
Number；
The first preset formula are as follows:
Wherein, uiFor first voltage signal, ipFor the first current signal, CiFor capacitance, ip(t- Δ t) is the second electric current
Signal, Ui(t- Δ t) is second voltage signal, time interval of the Δ t between current time and previous moment.
Preferably, after step 103 further include:
104, by the detection capacitance of each MMC submodule to be calculated and each MMC submodule to be calculated
The initial capacitance of block is compared, and obtains the ageing results of capacitor in each MMC submodule to be calculated.
Preferably, step 104 specifically includes:
1041, by the detection capacitance of each MMC submodule to be calculated and each MMC submodule to be calculated
The initial capacitance of block is compared, and obtains the rate of change of capacitance of each MMC submodule to be calculated；
1042, judge whether the rate of change of capacitance is greater than preset change threshold, if so, determining the change rate institute
Corresponding MMC submodule aging to be calculated, if it is not, then determining that MMC submodule to be calculated corresponding to the change rate is unaged.
Preferably, before step 104 further include:
105, the detection capacitance of each MMC submodule to be calculated is subjected to the filtering based on adaptive algorithm
Processing, obtains filtered detection capacitance.
Preferably, the adaptive algorithm specifically: LMS algorithm.
The application second aspect provides a kind of capacitance on-line measuring device of MMC submodule, comprising:
Receiving unit is sent for real-time reception MMC system, the of each MMC submodule operation in the MMC system
One switching signal, first voltage signal and the first current signal, the first switch signal are the switching signal at current time, institute
The capacitance voltage signal that first voltage signal is current time is stated, first current signal is that the bridge arm current at current time is believed
Number；
First judging unit, for judging that each first switch signal and each first switch signal are corresponding
Whether second switch signal is shutdown signal, if so, determining that the first switch signal and the second switch signal are equal
Submodule for shutdown signal is MMC submodule to be calculated, and triggers computing unit to each MMC submodule to be calculated,
The second switch signal is the switching signal of previous moment；
The computing unit, for being based on the first preset formula, according to the first of each MMC submodule to be calculated the electricity
Signal, the first current signal, second voltage signal and the second current signal are pressed, each MMC submodule to be calculated is obtained
Capacitance is detected, the second voltage signal is the capacitance voltage signal of previous moment, when second current signal is previous
The bridge arm current signal at quarter；
The first preset formula are as follows:
Wherein, uiFor first voltage signal, ipFor the first current signal, CiFor capacitance, ip(t- Δ t) is the second electric current
Signal, Ui(t- Δ t) is second voltage signal, time interval of the Δ t between current time and previous moment.
Preferably, described device further include:
Second judgment unit, for by the detection capacitance of each MMC submodule to be calculated with it is each described
The initial capacitance of MMC submodule to be calculated is compared, and obtains the aging of capacitor in each MMC submodule to be calculated
As a result.
Preferably, the second judgment unit specifically includes:
Computation subunit, for by the detection capacitance of each MMC submodule to be calculated and it is each it is described to
The initial capacitance for calculating MMC submodule is compared, and obtains the rate of change of capacitance of each MMC submodule to be calculated；
Judgment sub-unit, for judging whether the rate of change of capacitance is greater than preset change threshold, if so, determining institute
MMC submodule aging to be calculated corresponding to change rate is stated, if it is not, then determining MMC to be calculated corresponding to the change rate
Module is unaged.
Preferably, described device further include:
Filter unit, for carrying out the detection capacitance of each MMC submodule to be calculated based on adaptive
The filtering processing of algorithm obtains filtered detection capacitance.
Preferably, the adaptive algorithm specifically: LMS algorithm.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that
A kind of capacitance online test method of MMC submodule, comprising: 101, real-time reception MMC system send, it is described
First switch signal, first voltage signal and the first current signal of each MMC submodule operation in MMC system；102, judge
Whether each first switch signal and the corresponding second switch signal of each first switch signal are shutdown signal,
If so, the submodule that the determining first switch signal and the second switch signal are shutdown signal is MMC to be calculated
Submodule, and step 103 is executed to each MMC submodule to be calculated；103, it is based on the first preset formula, according to each institute
First voltage signal, the first current signal, second voltage signal and the second current signal for stating MMC submodule to be calculated, obtain
The detection capacitance of each MMC submodule to be calculated.In the application, the current of each MMC submodule is obtained in real time first
Then switching signal, voltage signal and the current signal of moment operation determine that current time is being put into the submodule used,
After determining the submodule that is used, while when because calculating, the capacitance at current time and switching signal, the voltage letter of previous moment
Number, current signal it is related, therefore judge whether the switching signal of previous moment is shutdown signal simultaneously, finally according to preset
The capacitance for being put into the submodule used at current time is calculated in one formula, solves existing to MMC submodule electricity
The detection of capacity is all the technical issues of can not learning capacitance in real time by the way of off-line measurement.
Detailed description of the invention
Fig. 1 is a kind of stream of the first embodiment of the capacitance online test method of MMC submodule in the embodiment of the present application
Journey schematic diagram；
Fig. 2 is a kind of stream of the second embodiment of the capacitance online test method of MMC submodule in the embodiment of the present application
Journey schematic diagram；
Fig. 3 is a kind of structural schematic diagram of the capacitance on-line measuring device of MMC submodule in the embodiment of the present application；
Fig. 4 is a kind of knot for the MMC system that the capacitance online test method of MMC submodule is built in the embodiment of the present application
Structure schematic diagram.
Specific embodiment
This application provides a kind of capacitance online test method of MMC submodule and devices, are used for flexible DC transmission
The capacitance monitoring of MMC submodule in engineering, solving the existing detection to MMC submodule capacitance all is using off-line measurement
Mode, the technical issues of can not learning capacitance in real time.
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
Referring to Fig. 1, a kind of first embodiment of the capacitance online test method of MMC submodule in the embodiment of the present application
Flow diagram, comprising:
Step 101, real-time reception MMC system are sent, the first switch letter of each MMC submodule operation in MMC system
Number, first voltage signal and the first current signal.
It should be noted that calculate the capacitance at MMC submodule current time in MMC system, first have to obtain MMC system
First switch signal, first voltage signal and the first current signal of each MMC submodule operation in system, it is to be understood that
First switch signal is the switching signal at current time, and first voltage signal is the capacitance voltage signal at current time, the first electricity
Flow the bridge arm current signal that signal is current time.It is understood that because MMC submodule is cascade pass on each bridge arm
System, locating for bridge arm current signal be to represent the running current signal of MMC submodule.
Step 102 judges whether are each first switch signal and the corresponding second switch signal of each first switch signal
It is shutdown signal, if so, the submodule that determining first switch signal and second switch signal are shutdown signal is wait count
MMC submodule is calculated, and step 103 is executed to each MMC submodule to be calculated.
It should be noted that in the operational process of MMC system, when submodule is only in investment state, capacitor
Just normal charge and discharge can be carried out in access circuit, can just measure the capacitance corresponding to it, therefore in receiving MMC system
After first switch signal, first voltage signal and the first current signal that each MMC submodule is run, MMC system is first confirmd that
Middle current time is being put into the MMC submodule used, that is, judges whether first switch signal is shutdown signal, while because of meter
When calculation, the capacitance and the switching signal of previous moment, voltage signal, current signal at current time are related, therefore judge simultaneously
Whether the switching signal of previous moment is shutdown signal, it is to be understood that when the second switch signal in this step is previous
The switching signal at quarter.
It is understood that switching signal is that i.e. represent the switching signal is put into use to shutdown signal.It is practical to use
In shutdown signal and opening signal can be set is different signals to distinguish, when receiving letter corresponding to shutdown signal
Number when, that is, think the signal of the switching signal at this time be shutdown signal.
Step 103 is based on the first preset formula, according to the first voltage signal of each MMC submodule to be calculated, the first electricity
Signal, second voltage signal and the second current signal are flowed, the detection capacitance of each MMC submodule to be calculated is obtained.
It should be noted that second voltage signal is the capacitance voltage signal of previous moment, the second current signal is previous
The bridge arm current signal at moment；
First preset formula are as follows:
Wherein, uiFor first voltage signal, ipFor the first current signal, CiFor capacitance, ip(t- Δ t) is the second electric current
Signal, Ui(t- Δ t) is second voltage signal, time interval of the Δ t between current time and previous moment.
It should be noted that carving the switching signal of the previous moment to each MMC submodule moment, voltage at the beginning
Signal, current signal are preset, and the detection capacitance of initial time is then calculated.It is understood that preset voltage letter
Number and current signal need to match with the initial capacitance of each MMC submodule.
In the present embodiment, switching signal, the voltage signal of the current time operation of each MMC submodule are obtained in real time first
And current signal, then determine that current time is being put into the submodule used, after determining the submodule used, while because
When calculating, the capacitance and the switching signal of previous moment, voltage signal, current signal at current time are related, therefore sentence simultaneously
Whether the switching signal of disconnected previous moment is shutdown signal, and current time finally is being calculated according to the first preset formula
It is put into the capacitance of the submodule used, solving the existing detection to MMC submodule capacitance all is using off-line measurement
Mode, the technical issues of can not learning capacitance in real time.
The above are a kind of first implementations of the capacitance online test method of MMC submodule provided by the embodiments of the present application
Example, the following are a kind of second embodiments of the capacitance online test method of MMC submodule provided by the embodiments of the present application.
Referring to Fig. 2, a kind of second embodiment of the capacitance online test method of MMC submodule in the embodiment of the present application
Flow diagram, comprising:
Step 201, real-time reception MMC system are sent, the first switch letter of each MMC submodule operation in MMC system
Number, first voltage signal and the first current signal.
Step 201 is identical as the content of step 101 in the application first embodiment, and specific descriptions may refer to the first implementation
The content of example step 101, details are not described herein.
Step 202 judges whether are each first switch signal and the corresponding second switch signal of each first switch signal
It is shutdown signal, if so, the submodule that determining first switch signal and second switch signal are shutdown signal is wait count
MMC submodule is calculated, and step 203 is executed to each MMC submodule to be calculated.
Step 202 is identical as the content of step 102 in the application first embodiment, and specific descriptions may refer to the first implementation
The content of example step 102, details are not described herein.
Step 203 is based on the first preset formula, according to the first voltage signal of each MMC submodule to be calculated, the first electricity
Signal, second voltage signal and the second current signal are flowed, the detection capacitance of each MMC submodule to be calculated is obtained.
Step 203 is identical as the content of step 103 in the application first embodiment, and specific descriptions may refer to the first implementation
The content of example step 103, details are not described herein.
Step 204 carries out the detection capacitance of each MMC submodule to be calculated at the filtering based on adaptive algorithm
Reason, obtains filtered detection capacitance.
It should be noted that due to factors such as voltage signal, the measurement error of current signal, the errors of calculation formula itself
Influence, the case where usually making calculated capacitance that fluctuation be presented, will affect the aging journey of the capacitor of judging submodule
Degree.So, it is also necessary to the capacitance being calculated is filtered.Further, adaptive algorithm is LMS algorithm.
Step 205, by the filtered detection capacitance of each MMC submodule to be calculated and each MMC submodule to be calculated
The initial capacitance of block is compared, and obtains the ageing results of capacitor in each MMC submodule to be calculated.
It should be noted that by the detection capacitance of each MMC submodule to be calculated and each MMC submodule to be calculated
Initial capacitance is compared, and the ageing results for obtaining capacitor in each MMC submodule to be calculated specifically include: by it is each to
Calculate MMC submodule detection capacitance be compared with the initial capacitance of each MMC submodule to be calculated, obtain it is each to
Calculate the rate of change of capacitance of MMC submodule；Judge whether rate of change of capacitance is greater than preset change threshold, if so, determining
MMC submodule aging to be calculated corresponding to change rate, if it is not, then determining that MMC submodule to be calculated is not corresponding to change rate
Aging.It is understood that preset change threshold can be set as needed, such as 5% etc., it is not specifically limited herein.Just
Beginning capacitance can be measured before MMC system is added in submodule using the measuring device of capacitance.
It is understood that determining each MMC submodule in the present embodiment in order to ensure ageing results determine correct
Before ageing results, the detection capacitance being calculated is filtered first, it is to be understood that equally can be with
Directly the detection capacitance being calculated is compared with initial capacitance, to obtain ageing results.
In the present embodiment, switching signal, the voltage signal of the current time operation of each MMC submodule are obtained in real time first
And current signal, then determine that current time is being put into the submodule used, after determining the submodule used, while because
When calculating, the capacitance and the switching signal of previous moment, voltage signal, current signal at current time are related, therefore sentence simultaneously
Whether the switching signal of disconnected previous moment is shutdown signal, and current time finally is being calculated according to the first preset formula
It is put into the capacitance of the submodule used, solving the existing detection to MMC submodule capacitance all is using off-line measurement
Mode, the technical issues of can not learning capacitance in real time.
The above are a kind of second implementations of the capacitance online test method of MMC submodule provided by the embodiments of the present application
Example, the following are the first preset formula meters in a kind of capacitance online test method of MMC submodule provided by the embodiments of the present application
Calculate the verifying confirmation of result.
Step 1: building single-phase N+1 level material object MMC system as shown in Fig. 4.The system runs the upper and lower bridge in part
Arm is connected in series by N number of MMC submodule (SM module as illustrated in the drawing) respectively, and each submodule includes a capacitor.Exchange
Side is passive system, is grounded via resistance R1, and DC side connects DC power supply and capacitor C1, C2.
Step 2: building MMC system control model part on the Simulink platform of MATLAB, and it is compiled into RTLAB
In.The Controlling model includes modulation module and S-Function module.Wherein, modulation module uses nearest level modulation (NLM),
Obtain the submodule number N that each bridge arm of subsequent time should be put into0n, S-Function module is inputted as modulated signal.
S-Function module uses traditional capacitor voltage balance strategy, is based on bridge arm current direction and MMC submodule capacitor voltage
The balance control of MMC submodule capacitor voltage is realized in sequence, is determined the MMC submodule that subsequent time should be put into, that is, is determined each
The investment or excision state of MMC submodule.
Step 3: MMC under original state is run each MMC submodule capacitor voltage u that part system is runi0(i=
1,2,3 ..., 2N) and upper and lower bridge arm current signal ip0, in0 input RTLAB in S-Function module.Pass through RTLAB
Simulation calculation is carried out, initial switching signals, output to MMC system in kind are obtained.
Step 4: material object MMC system tjThe MMC submodule capacitor voltage u that moment runsij(i=1,2,3 ...,
2N) and bridge arm current signal ipj、inj, on the one hand return again in the Controlling model of RTLAB, carry out subsequent time tj+1Switch
The calculating of signal；On the other hand together with the switching signal that the RTLAB moment is calculated, for further analyzing and calculating.
Step 5: in on-line monitoring system, by tjThe u that moment obtains in real timeij(i=1,2,3 ..., 2N) and ipj、injDeng
The signal needed inputs preset capacitor on-line monitoring algoritic module, and the capacitance C of each MMC submodule capacitor is calculatedi
(i=1,2,3 ..., 2N).It is understood that including that the first preset formula computing function can be achieved in on-line detecting system
Module.
Step 6: i-th of MMC submodule capacitance Ci being calculated (i=1,2,3 ..., 2N) is obtained with actual measurement
Capacitance Cim (i=1,2,3 ..., 2N) compare, if error delta meets following formula, then it is assumed that capacitor monitors algorithm on-line
Accuracy reaches requirement:
The above are the first preset public affairs in a kind of capacitance online test method of MMC submodule provided by the embodiments of the present application
The description of the verifying confirmation of formula, the following are a kind of capacitance on-line measuring devices of MMC submodule provided by the embodiments of the present application
Embodiment, please refer to Fig. 3.
A kind of capacitance on-line measuring device of the MMC submodule provided in the embodiment of the present application, comprising:
Receiving unit 301 is sent for real-time reception MMC system, the of each MMC submodule operation in MMC system
One switching signal, first voltage signal and the first current signal, first switch signal are the switching signal at current time, the first electricity
Pressing signal is the capacitance voltage signal at current time, and the first current signal is the bridge arm current signal at current time；
First judging unit 302, for judging each first switch signal and each first switch signal corresponding second
Whether switching signal is shutdown signal, if so, determining first switch signal and second switch signal are shutdown signal
Submodule is MMC submodule to be calculated, and triggers computing unit 303 to each MMC submodule to be calculated, and second switch signal is
The switching signal of previous moment；
Computing unit 303 is believed for being based on the first preset formula according to the first voltage of each MMC submodule to be calculated
Number, the first current signal, second voltage signal and the second current signal, obtain the detection capacitor of each MMC submodule to be calculated
Amount, second voltage signal are the capacitance voltage signal of previous moment, and the second current signal is the bridge arm current signal of previous moment；
First preset formula are as follows:
Wherein, uiFor first voltage signal, ipFor the first current signal, CiFor capacitance, ip(t- Δ t) is the second electric current
Signal, Ui(t- Δ t) is second voltage signal, time interval of the Δ t between current time and previous moment.
Further, device further include:
Second judgment unit, for by the detection capacitance of each MMC submodule to be calculated and each MMC submodule to be calculated
The initial capacitance of block is compared, and obtains the ageing results of capacitor in each MMC submodule to be calculated.
Further, second judgment unit specifically includes:
Computation subunit, for by the detection capacitance of each MMC submodule to be calculated and each MMC submodule to be calculated
Initial capacitance be compared, obtain the rate of change of capacitance of each MMC submodule to be calculated；
Judgment sub-unit, for judging whether rate of change of capacitance is greater than preset change threshold, if so, determining change rate
Corresponding MMC submodule aging to be calculated, if it is not, then determining that MMC submodule to be calculated corresponding to change rate is unaged.
Further, device further include:
Filter unit, for the detection capacitance of each MMC submodule to be calculated to be carried out the filter based on adaptive algorithm
Wave processing, obtains filtered detection capacitance.
Further, adaptive algorithm specifically: LMS algorithm.
In the present embodiment, switching signal, the voltage signal of the current time operation of each MMC submodule are obtained in real time first
And current signal, then determine that current time is being put into the submodule used, after determining the submodule used, while because
When calculating, the capacitance and the switching signal of previous moment, voltage signal, current signal at current time are related, therefore sentence simultaneously
Whether the switching signal of disconnected previous moment is shutdown signal, and current time finally is being calculated according to the first preset formula
It is put into the capacitance of the submodule used, solving the existing detection to MMC submodule capacitance all is using off-line measurement
Mode, the technical issues of can not learning capacitance in real time.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of device or unit
Letter connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the application
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of capacitance online test method of MMC submodule characterized by comprising
101, real-time reception MMC system is sent, the first switch signal of each MMC submodule operation in the MMC system, the
One voltage signal and the first current signal, the first switch signal are the switching signal at current time, the first voltage letter
Number be current time capacitance voltage signal, first current signal be current time bridge arm current signal；
102, judge whether are each first switch signal and the corresponding second switch signal of each first switch signal
It is shutdown signal, if so, the determining first switch signal and the second switch signal are the submodule of shutdown signal
Block is MMC submodule to be calculated, and executes step 103 to each MMC submodule to be calculated, and the second switch signal is
The switching signal of previous moment；
103, it is based on the first preset formula, is believed according to the first voltage signal of each MMC submodule to be calculated, the first electric current
Number, second voltage signal and the second current signal, obtain the detection capacitance of each MMC submodule to be calculated, described
Two voltage signals are the capacitance voltage signal of previous moment, and second current signal is the bridge arm current signal of previous moment；
The first preset formula are as follows:
Wherein, uiFor first voltage signal, ipFor the first current signal, CiFor capacitance, ip(t- Δ t) is the second current signal,
Ui(t- Δ t) is second voltage signal, time interval of the Δ t between current time and previous moment.
2. the method according to claim 1, wherein after step 103 further include:
104, by the detection capacitance of each MMC submodule to be calculated and each MMC submodule to be calculated
Initial capacitance is compared, and obtains the ageing results of capacitor in each MMC submodule to be calculated.
3. according to the method described in claim 2, it is characterized in that, step 104 specifically includes:
1041, by the detection capacitance of each MMC submodule to be calculated and each MMC submodule to be calculated
Initial capacitance is compared, and obtains the rate of change of capacitance of each MMC submodule to be calculated；
1042, judge whether the rate of change of capacitance is greater than preset change threshold, if so, determining corresponding to the change rate
MMC submodule aging to be calculated, if it is not, then determining that MMC submodule to be calculated corresponding to the change rate is unaged.
4. according to the method described in claim 2, it is characterized in that, before step 104 further include:
105, the detection capacitance of each MMC submodule to be calculated is carried out at the filtering based on adaptive algorithm
Reason, obtains filtered detection capacitance.
5. according to right want 4 described in method, which is characterized in that the adaptive algorithm specifically: LMS algorithm.
6. a kind of capacitance on-line measuring device of MMC submodule characterized by comprising
Receiving unit is sent for real-time reception MMC system, and the first of each MMC submodule operation opens in the MMC system
OFF signal, first voltage signal and the first current signal, the first switch signal are the switching signal at current time, described the
One voltage signal is the capacitance voltage signal at current time, and first current signal is the bridge arm current signal at current time；
First judging unit, for judging each first switch signal and each first switch signal corresponding second
Whether switching signal is shutdown signal, if so, the determining first switch signal and the second switch signal are to close
The submodule for closing signal is MMC submodule to be calculated, and triggers computing unit to each MMC submodule to be calculated, described
Second switch signal is the switching signal of previous moment；
The computing unit is believed for being based on the first preset formula according to the first voltage of each MMC submodule to be calculated
Number, the first current signal, second voltage signal and the second current signal, obtain the detection of each MMC submodule to be calculated
Capacitance, the second voltage signal are the capacitance voltage signal of previous moment, and second current signal is previous moment
Bridge arm current signal；
The first preset formula are as follows:
Wherein, uiFor first voltage signal, ipFor the first current signal, CiFor capacitance, ip(t- Δ t) is the second current signal,
Ui(t- Δ t) is second voltage signal, time interval of the Δ t between current time and previous moment.
7. device according to claim 6, which is characterized in that described device further include:
Second judgment unit, by by the detection capacitance of each MMC submodule to be calculated and each described to based on
The initial capacitance for calculating MMC submodule is compared, and obtains the aging knot of capacitor in each MMC submodule to be calculated
Fruit.
8. device according to claim 7, which is characterized in that the second judgment unit specifically includes:
Computation subunit, for by the detection capacitance of each MMC submodule to be calculated with it is each described to be calculated
The initial capacitance of MMC submodule is compared, and obtains the rate of change of capacitance of each MMC submodule to be calculated；
Judgment sub-unit, for judging whether the rate of change of capacitance is greater than preset change threshold, if so, determining the change
MMC submodule aging to be calculated corresponding to rate, if it is not, then determining MMC submodule to be calculated corresponding to the change rate
It is unaged.
9. device according to claim 7, which is characterized in that described device further include:
Filter unit, for carrying out the detection capacitance of each MMC submodule to be calculated based on adaptive algorithm
Filtering processing, obtain filtered detection capacitance.
10. according to right want 9 described in device, which is characterized in that the adaptive algorithm specifically: LMS algorithm.
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| CN114839470A (en) * | 2022-07-06 | 2022-08-02 | 西安交通大学 | Capacitor monitoring method, device, equipment and medium for submodule of MMC system |
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