CN105911327A - MMC module voltage measurement method having intelligent correction function - Google Patents
MMC module voltage measurement method having intelligent correction function Download PDFInfo
- Publication number
- CN105911327A CN105911327A CN201610262360.8A CN201610262360A CN105911327A CN 105911327 A CN105911327 A CN 105911327A CN 201610262360 A CN201610262360 A CN 201610262360A CN 105911327 A CN105911327 A CN 105911327A
- Authority
- CN
- China
- Prior art keywords
- module
- voltage
- value
- memorizer
- capacitance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses an MMC module voltage measurement method having an intelligent correction function. Output port voltage of two adjacent series-connected single capacitor modules or a double capacitor module is measured by using a voltage sensor or a measuring circuit. The respective capacitor voltage value is calculated according to the operation state of the measured module, and a voltage correction method is put forward to correct respective capacitor voltage so that hardware cost and complexity can be reduced and reliability can be enhanced. The method is suitable for an existing modulation and control strategy without limitation of the operation state change law of the module so that adaptability is great, universality is high, the method is realized in a module controller without influencing other control functions of the module or increasing the computational burden of the main controller, and thus the method is suitable for the application occasion having multiple module MMC, such as the field of high-voltage DC power transmission and electric traction, etc.
Description
Technical field
The invention belongs to applied power electronics technical field, be specifically designed a kind of MMC module with intelligent calibration function
Voltage measurement method.
Background technology
Along with economic fast development, the progressively expansion of social production scale, various forms of electricity needs constantly increase,
Requirement to power electronic equipment is more and more higher, and Power Electronic Technique develops rapidly therewith, and wherein multi-level converter is because of tool
There are the advantages such as output voltage is high, harmonic content is low, voltage change ratio is little, device for power switching voltage stress is little, switching frequency is low
It is increasingly becoming the study hotspot of high-power electric power application.Along with the pressure grade of all-controlling power electronics device and appearance
The continuous lifting of amount so that use the multiple voltage source converter of insulated gate bipolar transistor composition and be applied to the big merit of high pressure
Rate occasion is possibly realized.Wherein Modular multilevel converter (modular multilevel converter, hereinafter referred
MMC) as it is shown in figure 1, be prone to dilatation because having high modularization structure, have common DC bus can improve system can
By property and advantageously reduce cost, insensitive and be easily achieved, off-center operation ability, event to the stray parameter of main loop
Barrier passes through the advantages such as, good output waveform strong with recovery capability so that its two more traditional level or three-level converter have one
Number of advantages, so being recent research focus both domestic and external.
Because containing more module in MMC, when electric pressure is higher, one brachium pontis even can reach hundreds of module strings
Connection, and the capacitance voltage of each module is the important parameter that system control must gather, so meaning that needs are more
Voltage sensor or the hardware facility such as tension measuring circuit, hardware cost and the complexity of system are higher.Module voltage is MMC
It is most that system runs quantity in the parameter needing to gather, therefore if reducing hardware complexity journey in terms of module voltage measurement
Degree, it will help the reliability service of system.Along with MMC research is goed deep into, go out to make the reasons such as MMC reply DC Line Fault
Existing double capacitance modules, find a kind of voltage measurement method being applicable to this module to be extremely necessary.
In order to the capacitance voltage of each module is controlled, in conventional conventional method, need to measure all modules
Capacitance voltage.Existing module voltage measuring method is all that the capacitance voltage to each module directly measures so that each
Module will have corresponding voltage sensor or tension measuring circuit, hardware complexity and cost the biggest.Meanwhile, existing one
It is complicated that a little measuring methods not only calculate process, and accuracy is low, and versatility is low.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of versatility more preferable, and accuracy is higher
The MMC module voltage measuring method with intelligent calibration function.
Technical scheme: the invention provides a kind of MMC module voltage measuring method with intelligent calibration function, including with
Lower step:
Step 1: voltage sensor or voltage sampling circuit are arranged on the output of the single capacitor module of two adjacent series connection
Port or the output port of double capacitance module, this output port is sampled point；The single capacitor module or double of two adjacent series connection
In capacitance module, two modules are expressed as module 1 and module 2；
Step 2: module voltage is measured and initialized, and arranges each module voltage maximum threshold ucimaxref, module voltage
Minimum judges threshold value umin, correction index d initial, and in MMC system, select 9 memorizeies storage relevant parameters；
Step 3: voltage sensor or voltage sampling circuit start to measure sample amplitude when reproduced um；
Step 4: determine two sub-modules in the running status of the single capacitor module of two adjacent series connection or double capacitance module
Running status, in integrating step 3 obtain sample amplitude when reproduced umObtain the capacitance voltage value of each module；Wherein, F1 table is used
Show the running status variable of module 1, the running status variable of F2 representation module 2；
Step 5: judge to control whether to terminate, if the master controller of MMC system does not send control END instruction, root
According to system control signal, continue cycling through and carry out step 3～step 4 measurement module voltage；If the master controller of MMC system sends
Control END instruction, then finishing control；
Wherein, the method for the capacitance voltage value obtaining each module described in described step 4 is:
Capacitance voltage u as F1=0 and F2=0, in module 1c1=M1, M1 represent the value in first memory, first
Memorizer is the value of capacitance voltage, the capacitance voltage u in module 2 in logging modle 1c2=M2, M2 represent in second memory
Value, second memory is the value of capacitance voltage in the logging modle 2；Value in first memory and second memory is the most more
Newly；Meanwhile, the state value of the first current module and the second module is stored in the 8th memorizer；Wherein, the 8th memorizer
Change front first module and the state value of the second module for running status of record, represent in the 8th memorizer with M8
Value；
As F1=1 and F2=0, it is judged that the voltage u of sample pointmScope, if um≤uminOr um≥2umin, module
Capacitance voltage u in 1c1=M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory is the most more
Newly, detection is proceeded；If umin＜ um＜ 2umin, it is judged that whether the calculation flag position of correction index is 1, Qi Zhong
Nine memorizeies, for the flag bit of recording voltage correction coefficient, represent the value in the 9th memorizer with M9；If correction index
Calculation flag position be 1, then by the voltage u of now sample pointmStoring in the 5th memorizer, M5 represents in the 5th memorizer
Value, calculate correction index d update original voltage school according to formula d=(| M5-M3 |)/(| M1+M2-M3-M4 |)
Positive coefficient, the 7th memorizer is for storing the value of correction index d, and M7 represents the value in the 7th memorizer, then by the 9th
The value of memorizer is updated to 0；The now capacitance voltage u in module 1c1Magnitude of voltage u for this sample pointm, electricity in module 2
Hold voltage uc2Constant；Update the value in first memory, and the 8th memorizer will store the first current module and the second mould
The state value of block；If the calculation flag position of correction index is not 1, directly make the capacitance voltage u in module 1c1For
This time magnitude of voltage u of sample pointm, capacitance voltage u in module 2c2Constant；Update the value in first memory, and by the 8th
Memorizer stores the first current module and the state value of the second module；
As F1=0 and F2=1, it is judged that the voltage u of sample pointmScope, if um≤uminOr um≥2umin, module
Capacitance voltage u in 1c1=M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory is the most more
Newly, detection is proceeded；If umin＜ um＜ 2umin, it is judged that the calculation flag position of correction index is 1, if voltage school
The calculation flag position of positive coefficient is 1, then by the voltage u of now sample pointmStoring in the 6th memorizer, M6 represents that the 6th deposits
Value in reservoir；Calculate correction index d according to formula 1-d=(| M6-M4 |)/(| M1+M2-M3-M4 |) and update original
Correction index, the value after then updating stores in the 7th memorizer, then the value of the 9th memorizer is updated to 0；
The now capacitance voltage u in module 2c2Magnitude of voltage u for this sample pointm, capacitance voltage u in module 1c1Constant；Update
Value in second memory, and in the 8th memorizer, store the first current module and the state value of the second module；If pressure
The calculation flag position of correction coefficient is not 1, directly makes the capacitance voltage u in module 2c2Magnitude of voltage for this sample point
um, capacitance voltage u in module 1c1Constant；Update the value in second memory, and in the 8th memorizer, store current the
One module and the state value of the second module；
As F1=1 and F2=1, it is judged that measure voltage umScope, if um≤2uminTime, the capacitance voltage in module 1
uc1=M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory does not updates, and proceeds inspection
Survey；If um>2umin, it is judged that whether a front running status is F1=1 and F2=0 or F1=0 and F2=1 or F1=0 and F2
=0, if the one met in three kinds of situations, then the value in now first memory is stored in the 3rd memorizer, by this
Time second memory in value store in the 4th memorizer, the value in the 9th memorizer is updated to 1, represents the 3rd storage with M3
Value in device, M4 represents the value in the 4th memorizer；And according to formula uv1=(Um-M1-M2) × M7 computing module 1 voltage become
Change amount uv1, according to formula uv2=(Um-M1-M2) the voltage variety u of × (1-M7) computing module 2v2；If all not meeting three
The situation of kind, the voltage variety u of direct computing module 1v1Voltage variety u with module 2v2, now, the electric capacity electricity in module 1
Pressure uc1=M1+uv1, capacitance voltage u in module 2c2=M2+uv2；And the capacitance voltage storage value of more new module 1 and module 2；More
Value in new first memory and second memory, and the 8th memorizer will store the first current module and the second module
State value.
Further, the initial value of described voltage correction system d is 0.5, after calculating overvoltage correction coefficient d, will calculate
The excursion of correction index d and correction index d compare, if correction index d calculated exists
In excursion, then update the value in the 7th memorizer by correction index d calculated, if correction index is not
In excursion, the most do not update the correction index in the 7th memorizer.Correction index reflects measured two
Individual module capacitance capacity ratio, so timing update correction index can make the result of measurement more accurate.
Further, the excursion of described correction index d is 0.4-0.6.The result so making measurement is more accurate,
It is prevented effectively from the impact of the factors such as interference.
Further, when MMC is properly functioning, the running status of the single capacitor module of two adjacent series connection in described step 4
Or the running status of two modules is entered according to the state of the on or off of the switching device in each module in double capacitance module
Row judges.
Further, when there is HVDC side short trouble in MMC, the single capacitor of two adjacent series connection in described step 4
In the running status of module or double capacitance module, the running status of two modules is according to each module topology with through this module
The sense of current is set.
Further, the method for the described acquisition sense of current is: take the capacitance voltage value of the module of nearest twice acquisition, uses
After the module capacitance magnitude of voltage that once obtains deduct the capacitance voltage value obtained second from the bottom time, according to the positive and negative values obtaining result
Judge the sense of current through this module, flow into if canonical electric current forward, reversely flow into if negative then electric current.
Further, the method for the described acquisition sense of current is: the current value each bridge arm current measuring circuit obtained, via
MMC master controller is sent to module controller and carries out the judgement of sense of current.
Further, the method for the described acquisition sense of current is: the voltage u at described collection pointmFrequency acquisition be not less than
The twice of the module equivalent switching frequency peak measured.
Further, described module voltage maximum threshold ucimaxrefBeing the single capacitance voltage rated value of 1.2 times, minimum is sentenced
Disconnected threshold value uminBe 0.8 times single capacitance voltage rated value.
Operation principle: the present invention selects to enter in the single capacitor module of two adjacent series connection or the output port of double capacitance module
Row voltage measurement, then obtains the voltage of each capacitance module respectively according to the magnitude of voltage measuring acquisition.Obtaining each electric capacity
During the voltage of module, it is provided that the computing formula of two kinds of correction index, refer to the flag bit of correction index simultaneously
Judge whether to calculate correction index, so the running status of two modules is not limited, it is judged that simpler.Thus
The result making the voltage measurement of each capacitance module is more accurate..
Beneficial effect: compared with prior art, The present invention reduces Rule of judgment, optimizes algorithm, not by running status
The restriction of Changing Pattern, is applicable to various running status Changing Pattern, and versatility is more preferable, and reliability is higher.Can be at double electricity
The measurement of appearance module voltage and fault diagnosis have well effect, and this voltage measurement method is suitably applied present institute
The modulation strategy of some MMC and control strategy.
Accompanying drawing explanation
Fig. 1 is the overall theory diagram of Modular multilevel converter；
Fig. 2 is four kinds of module topology structures containing two electric capacity, and wherein (a) represents two half-bridge single capacitor block coupled in series
Voltage acquisition point theory diagram, (b) represents the voltage acquisition point theory diagram of double capacitance module, and (c) represents asymmetric intersection
The voltage acquisition point theory diagram of the double capacitance module of type, (d) represents a half-bridge single capacitor module and a full-bridge single capacitor mould
The voltage acquisition point theory diagram of block series connection；
The flow chart of the measuring method that Fig. 3 provides for the present invention；
Fig. 4 is that module status [F1 F2] determines method schematic diagram, the determination side under wherein (a) represents normal operation
Method schematic diagram, (b) represents the determination method schematic diagram in the case of driving signal to block.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is done and further explain.
Embodiment:
The method that the present invention provides all module output voltages be applicable to MMC are more than or equal to the single capacitor of 0 or double electricity
Molar block.
Double capacitance modules as shown in Fig. 2 (b) can be considered as the simplification of multiple pair of capacitance module when module normally works
Or equivalent topologies, and identical, therefore with such as with two half-bridge single capacitor block coupled in series topology operation principles as shown in Fig. 2 (a)
As a example by double capacitance modules shown in Fig. 2 (b).
The voltage acquisition point selection of a kind of MMC module voltage measuring method proposed is at the double electric capacity as shown in Fig. 2 (b)
The output port of module, the method that the present invention provides realizes in the module controller of MMC system.
As it is shown on figure 3, a kind of MMC module voltage measuring method comprises the steps of
Step 1: voltage sensor or voltage sampling circuit are arranged on the output port of double capacitance module, this output port
For sampled point；In double capacitance modules, two modules are expressed as module 1 and module 2；
Step 2: module voltage is measured and initialized, and arranges each module voltage maximum threshold ucimaxrefIt it is the list of 1.2 times
Individual capacitance voltage rated value, the minimum of module voltage judges threshold value uminBe 0.8 times single capacitance voltage rated value, because of
For module capacitance to set clocking requirement capacitance equal, and therefore the initial value of correction index d is set to 0.5, and in MMC system
9 memorizer storage relevant parameters of middle selection；Wherein, correction index d stores in the 7th memorizer, and M7 represents that the 7th deposits
Value in reservoir.
Step 3: voltage sensor or voltage sampling circuit start to measure sample amplitude when reproduced um；The frequency of voltage sample should height
More than the twice of surveyed module equivalent switching frequency peak.
Step 4: determine the running status of two modules, the sample amplitude when reproduced obtained in integrating step 3 in double capacitance module
umObtain the capacitance voltage value of each module；Wherein, the running status of double capacitance modules represents with [F1 F2], F1 representation module 1
Running status variable, the running status variable of F2 representation module 2.
When MMC is properly functioning, as shown in Fig. 4 (a), it is considered to the on or off time of switching device, voltage signal acquisition
With the time delay read, time properly functioning, the running status of module can represent with the switching drive signal in module, mould
In block 1, the switching drive signal of T1 and T2 is complementary, and during T1 conducting, module 1 is output as positive voltage, and after postponing, F1=1, T1 close
Time disconnected, module 1 is output as 0, through postponing F1=0.Similarly, in module 2, the switching drive signal of T3 and T4 is complementary, and T3 turns on
Time, module 2 is output as positive voltage, and when after postponing, F2=1, T3 turn off, module 2 is output as 0, through postponing F2=0.
If MMC occurs HVDC side short trouble, the driving signal of the most all switching devices will be blocked, or
Module switch device itself is short-circuited fault, is blocked by the driving signal of this module switch device for protection system, this
In the case of Zhong, the driving signal of switching device is blocked the duty of the measurement no longer judge module switching device of module voltage,
But as shown in Fig. 4 (b), according to different module topology types and the value of sense of current setting [F1 F2] through this module,
Then module voltage is recorded according to the value binding modules voltage universal measurement method of [F1 F2].Wherein current direction signal is permissible
The current value obtained by each bridge arm current measuring circuit delivering to MMC master controller, is sent to module control via MMC master controller
Device processed carries out judging sense of current, it is also possible to judges according to recording the module voltage recorded nearest twice, surveys with last
The voltage obtained deducts second from the bottom the voltage recorded, and flows into if canonical electric current forward, if negative then electric current reverse flow
Enter.The series topology of two half-bridge single capacitor modules as shown in Fig. 2 (a), the switching device of module 1 and module 2 drives signal
The value of [F1 F2] after being all blocked is set as [1 1] when electric current forward flows into this topology, and electric current reverse flow is fashionable to be set as
[0 0], it is assumed that this topology only has the switching device of module 1 drive signal to be blocked, and module 2 normally works, then [F1 F2]
Value be set as when electric current forward flows into this topology [1 F2], electric current reverse flow is fashionable is set as [0 F2], and wherein F2 represents
The running status of module 2；The topological structure of the double capacitance modules as shown in Fig. 2 (b), the driving signal of all switching devices is sealed
The value of [F1 F2] after lock is set as [1 1] when electric current forward flows into, and reverse flow is fashionable is set as [0 0]；Such as Fig. 2 (c) institute
The topological structure of the double capacitance module of the asymmetric chiasma type shown, all switching devices drive signal to be blocked after [F1 F2]
The value no matter sense of current be the most all set to [1 1]；A half-bridge single capacitor module as shown in Fig. 2 (d) and one complete
The topological structure of bridge single capacitor block coupled in series, all switching devices drive signal to be blocked after the value of [F1 F2] at electric current
Forward is set as [1 1] when flowing into, and reverse flow is fashionable is set as [0 1].
When [F1 F2]=[0 0], the capacitance voltage u in module 1c1=M1, M1 represent the value in first memory, the
One memorizer is the value of capacitance voltage, the capacitance voltage u in module 2 in logging modle 1c2=M2, M2 represent second memory
In value, second memory is the value of capacitance voltage in the logging modle 2；Value in first memory and second memory is the most more
Newly；Meanwhile, the 8th memorizer stores the first current module and the state value of the second module, i.e. M8=[F1 F2]；Wherein,
8th memorizer changes front first module and the state value of the second module for running status of record, represents that the 8th deposits with M8
Value in reservoir；
When [F1 F2]=[1 0], it is judged that the voltage u of sample pointmScope, if um≤uminOr um≥2umin, mould
Capacitance voltage u in block 1c1=M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory is not
Update, proceed detection；If umin＜ um＜ 2umin, it may be judged whether M9=1, wherein the 9th memorizer is used for recording voltage
The calculation flag position of correction coefficient, represents the value in the 9th memorizer with M9, if M9=1, then by the electricity of now sample point
Pressure umStoring in the 5th memorizer, M5 represents the value in the 5th memorizer；Then according to formula d=(| M5-M3 |)/(| M1+
M2-M3-M4 |) calculate correction index d.Wherein, M3 represents the value in the 3rd memorizer, and M4 represents in the 4th memorizer
Value, in the 3rd memorizer, initial value is the rated value of module 1 capacitance voltage, and in the 4th memorizer, initial value is module 2 capacitance voltage
Rated value.In order to avoid the impact of the factors such as interference, before the value in updating the 7th memorizer, preferably to the voltage calculated
Correction coefficient d judges.In engineering, the error of module capacitance is generally 20% to the maximum, is therefore 20% in error
Time, the excursion of correction index is 0.4-0.6, so correction index should in this range, if voltage correction
This calculated new correction index in excursion, is then stored in the 7th memorizer by coefficient, if electric
Pressure correction coefficient is not in excursion, then this does not update correction index, and correction index is still for being stored in the 7th
Value in memorizer.Then the value of the 9th memorizer is updated to 0；The now capacitance voltage u in module 1c1For this sample point
Magnitude of voltage um, capacitance voltage u in module 2c2Constant；Updating the value in first memory, in the 8th memorizer, storage is current
The first module and the state value of the second module；If M9=0, directly make the capacitance voltage u in module 1c1Sample for this
Magnitude of voltage u at Dianm, capacitance voltage u in module 2c2Constant；Update the value in first memory, and by the 8th memorizer
Store the first current module and the state value of the second module；
When [F1 F2]=[0 1], it is judged that the voltage u of sample pointmScope, if um≤uminOr um≥2umin, mould
Capacitance voltage u in block 1c1=M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory is not
Update, proceed detection；If umin＜ um＜ 2umin, it may be judged whether (M9=1), if M9=1, then by now sampled point
The voltage u at placemStoring in the 6th memorizer, M6 represents the value in the 6th memorizer；Then according to formula 1-d=(| M6-M4
|)/(| M1+M2-M3-M4 |) calculate correction index d, then by correction index d calculated and correction index
Excursion compare, if in correction index d calculated in the range of 0.4-0.6, then this is calculated
To new correction index store in the 7th memorizer, if correction index d calculated is not at 0.4-0.6 model
In enclosing, then this does not update correction index, and correction index is still for be stored in the value in the 7th memorizer, meanwhile, and will
The value of the 9th memorizer is updated to 0；The now capacitance voltage u in module 2c2Magnitude of voltage u for this sample pointm, in module 1
Capacitance voltage uc1Constant；Update the value in second memory, the 8th memorizer stores the first current module and the second mould
The state value of block；If M9=0, directly make the capacitance voltage u in module 2c2Magnitude of voltage u for this sample pointm, module
Capacitance voltage u in 1c1Constant；Update the value in second memory, the 8th memorizer stores current the first module and second
The state value of module；
When [F1 F2]=[1 1], it is judged that measure voltage umScope, if um≤2uminTime, the electric capacity electricity in module 1
Pressure uc1=M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory does not updates, and proceeds
Detection；If um>2umin, it is judged that whether M8 is equal to [1 0] or [0 1] or [1 1], if the one met in three kinds of situations,
Then the value in now first memory is stored in the 3rd memorizer, the value in now second memory is stored to the 4th and deposits
In reservoir, representing the value in the 3rd memorizer with M3, M4 represents that the value in the 4th memorizer, the value in the 9th memorizer are updated to
1；I.e. M3=M1, M4=M2, M9=1；Then the voltage variety u of computing module 1v1Voltage variety u with module 2v2；As
Fruit does not all meet three kinds of situations, the voltage variety u of direct computing module 1v1Voltage variety u with module 2v2, wherein, uv1
=(Um-M1-M2) × M7, uv2=(Um-M1-M2)×(1-M7).Now, the capacitance voltage u in module 1c1=M1+uv1, module 2
In capacitance voltage uc2=M2+uv2；And the capacitance voltage storage value of more new module 1 and module 2；Update first memory and the
Value in two memorizeies, and the 8th memorizer will store the first current module and the state value of the second module.
Step 5: judge to control whether to terminate, if the master controller of MMC system does not send control END instruction, root
According to system control signal, continue cycling through and carry out step 3～step 4 measurement module voltage；If the master controller of MMC system sends
Control END instruction, then finishing control.
Correction index reflects measured two module capacitance capacity ratio, and this value changes less relatively, for
Can be simpler, acquisition magnitude of voltage quickly and accurately, can be by timing or the side of metering in practical implementation
Method reduces correction index operation times, if i.e. all kept not in the correction index long period or after repeatedly calculating
Become, then again correction index can be calculated after one operation period or counting.
Claims (9)
1. one kind have intelligent calibration function MMC module voltage measuring method, it is characterised in that: comprise the following steps:
Step 1: voltage sensor or voltage sampling circuit are arranged on the output port of the single capacitor module of two adjacent series connection
Or the output port of double capacitance modules, this output port is sampled point；The single capacitor module of two adjacent series connection or double electric capacity
In module, two modules are expressed as module 1 and module 2；
Step 2: module voltage is measured and initialized, and arranges each module voltage maximum threshold ucimaxref, the minimum of module voltage
Judge threshold value umin, the initial value of correction index d, and in MMC system, select 9 memorizer storage relevant parameters；
Step 3: voltage sensor or voltage sampling circuit start to measure sample amplitude when reproduced um；
Step 4: determine the fortune of two sub-modules in the running status of the single capacitor module of two adjacent series connection or double capacitance module
Row state, sample amplitude when reproduced u obtained in integrating step 3mObtain the capacitance voltage value of each module；Wherein, mould is represented with F1
The running status variable of block 1, the running status variable of F2 representation module 2；
Step 5: judge to control whether to terminate, if the master controller of MMC system does not send control END instruction, according to being
System control signal, continues cycling through and carries out step 3～step 4 measurement module voltage；If the master controller of MMC system sends control
END instruction, then finishing control；
Wherein, the method for the capacitance voltage value obtaining each module described in described step 4 is:
Capacitance voltage u as F1=0 and F2=0, in module 1c1=M1, M1 represent the value in first memory, the first storage
Device is the value of capacitance voltage, the capacitance voltage u in module 2 in logging modle 1c2=M2, M2 represent the value in second memory,
Second memory is the value of capacitance voltage in logging modle 2；Value in first memory and second memory does not updates；With
Time, the state value of the first current module and the second module is stored in the 8th memorizer；Wherein, the 8th memorizer is used for remembering
Record a running status and change front first module and the state value of the second module, represent the value in the 8th memorizer with M8；
As F1=1 and F2=0, it is judged that the voltage u of sample pointmScope, if um≤uminOr um≥2umin, in module 1
Capacitance voltage uc1=M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory does not updates,
Proceed detection；If umin＜ um＜ 2umin, it is judged that whether the calculation flag position of correction index is 1, wherein the 9th deposits
Reservoir, for the flag bit of recording voltage correction coefficient, represents the value in the 9th memorizer with M9；If the meter of correction index
Calculating flag bit is 1, then by the voltage u of now sample pointmStoring in the 5th memorizer, M5 represents in the 5th memorizer
Value, calculates correction index d according to formula d=(| M5-M3 |)/(| M1+M2-M3-M4 |) and updates original voltage correction
Coefficient, the 7th memorizer is for storing the value of correction index d, and M7 represents the value in the 7th memorizer, then deposits the 9th
The value of reservoir is updated to 0；The now capacitance voltage u in module 1c1Magnitude of voltage u for this sample pointm, electric capacity in module 2
Voltage uc2Constant；Update the value in first memory, and the 8th memorizer will store the first current module and the second module
State value；If the calculation flag position of correction index is not 1, directly make the capacitance voltage u in module 1c1For this
The magnitude of voltage u of sample pointm, capacitance voltage u in module 2c2Constant；Update the value in first memory, and store the 8th
Device stores the first current module and the state value of the second module；
As F1=0 and F2=1, it is judged that the voltage u of sample pointmScope, if um≤uminOr um≥2umin, in module 1
Capacitance voltage uc1=M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory does not updates,
Proceed detection；If umin＜ um＜ 2umin, it is judged that the calculation flag position of correction index is 1, if voltage correction system
The calculation flag position of number is 1, then by the voltage u of now sample pointmStoring in the 6th memorizer, M6 represents the 6th memorizer
In value；Calculate correction index d according to formula 1-d=(| M6-M4 |)/(| M1+M2-M3-M4 |) and update original electricity
Pressure correction coefficient, the value after then updating stores in the 7th memorizer, then the value of the 9th memorizer is updated to 0；Now
Capacitance voltage u in module 2c2Magnitude of voltage u for this sample pointm, capacitance voltage u in module 1c1Constant；Update second
Value in memorizer, and in the 8th memorizer, store the first current module and the state value of the second module；If pressure correction
The calculation flag position of coefficient is not 1, directly makes the capacitance voltage u in module 2c2Magnitude of voltage u for this sample pointm, mould
Capacitance voltage u in block 1c1Constant；Update the value in second memory, and in the 8th memorizer, store the first current module
State value with the second module；
As F1=1 and F2=1, it is judged that measure voltage umScope, if um≤2uminTime, the capacitance voltage u in module 1c1=
M1, the capacitance voltage u in module 2c2Value in=M2, first memory and second memory does not updates, and proceeds detection；As
Really um>2umin, it is judged that whether a front running status is F1=1 and F2=0 or F1=0 and F2=1 or F1=0 and F2=0, as
Fruit meets the one in three kinds of situations, then store in the 3rd memorizer by the value in now first memory, by now second
Value in memorizer stores in the 4th memorizer, and the value in the 9th memorizer is updated to 1, represents in the 3rd memorizer with M3
Value, M4 represents the value in the 4th memorizer；And according to formula uv1=(Um-M1-M2) voltage variety of × M7 computing module 1
uv1, according to formula uv2=(Um-M1-M2) the voltage variety u of × (1-M7) computing module 2v2；If all not meeting three kinds of feelings
Condition, the voltage variety u of direct computing module 1v1Voltage variety u with module 2v2, now, the capacitance voltage u in module 1c1
=M1+uv1, capacitance voltage u in module 2c2=M2+uv2；And the capacitance voltage storage value of more new module 1 and module 2；Update the
Value in one memorizer and second memory, and the 8th memorizer will store the first current module and the state of the second module
Value.
The MMC module voltage measuring method with intelligent calibration function the most according to claim 1, it is characterised in that: institute
The initial value stating voltage correction system d is 0.5, is calculating after overvoltage correction coefficient d, by correction index d that calculates with
The excursion of correction index d compares, if correction index d calculated is in excursion, then uses tricks
Correction index d calculated updates the value in the 7th memorizer, if correction index is not in excursion, the most not
Update the correction index in the 7th memorizer.
The MMC module voltage measuring method with intelligent calibration function the most according to claim 2, it is characterised in that: institute
The excursion stating correction index d is 0.4-0.6.
The MMC module voltage measuring method with intelligent calibration function the most according to claim 1, it is characterised in that: when
When MMC is properly functioning, in the running status of the single capacitor module of two adjacent series connection in described step 4 or double capacitance module two
The running status of module judges according to the state of the on or off of the switching device in each module.
The MMC module voltage measuring method with intelligent calibration function the most according to claim 1, it is characterised in that: when
When there is HVDC side short trouble in MMC, the running status or double of the single capacitor module of two adjacent series connection in described step 4
In capacitance module, the running status of two modules is set according to the sense of current of each module topology and this module of process.
The MMC module voltage measuring method with intelligent calibration function the most according to claim 5, it is characterised in that: institute
The method stating the acquisition sense of current is: take the capacitance voltage value of the module of nearest twice acquisition, by the last module obtained
Capacitance voltage value deducts second from the bottom the capacitance voltage value obtained, and the positive and negative values according to obtaining result judges through this module
The sense of current, flows into if canonical electric current forward, reversely flows into if negative then electric current.
The MMC module voltage measuring method with intelligent calibration function the most according to claim 5, it is characterised in that: institute
The method stating the acquisition sense of current is: the current value each bridge arm current measuring circuit obtained, and is sent to via MMC master controller
Module controller carries out the judgement of sense of current.
The MMC module voltage measuring method with intelligent calibration function the most according to claim 1, it is characterised in that: institute
The method stating the acquisition sense of current is: the voltage u at described collection pointmFrequency acquisition not less than measure module equivalent switch
The twice of frequency peak.
The MMC module voltage measuring method with intelligent calibration function the most according to claim 1, it is characterised in that: institute
State module voltage maximum threshold ucimaxrefBeing the single capacitance voltage rated value of 1.2 times, minimum judges threshold value uminIt is 0.8
Times single capacitance voltage rated value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610262360.8A CN105911327B (en) | 2016-04-25 | 2016-04-25 | A kind of MMC module voltage measuring methods with intelligent calibration function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610262360.8A CN105911327B (en) | 2016-04-25 | 2016-04-25 | A kind of MMC module voltage measuring methods with intelligent calibration function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105911327A true CN105911327A (en) | 2016-08-31 |
| CN105911327B CN105911327B (en) | 2018-06-19 |
Family
ID=56751862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610262360.8A Active CN105911327B (en) | 2016-04-25 | 2016-04-25 | A kind of MMC module voltage measuring methods with intelligent calibration function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105911327B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370393A (en) * | 2017-06-29 | 2017-11-21 | 全球能源互联网研究院 | A kind of Modularized multi-level converter sub-module topological structure and its guard method |
| EP3609069A1 (en) * | 2018-08-06 | 2020-02-12 | General Electric Technology GmbH | Converter system |
| CN113114141A (en) * | 2021-04-26 | 2021-07-13 | 北京机械设备研究所 | Method, device and equipment for compensating power supply voltage of electric steering engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120001618A1 (en) * | 2008-11-03 | 2012-01-05 | Flextronics International Kft. | System for monitoring capacitor cells |
| CN102495292A (en) * | 2011-11-17 | 2012-06-13 | 北京鼎汉技术股份有限公司 | Method and circuit for online monitoring capacity state of bus capacitor |
| CN103235219A (en) * | 2013-04-17 | 2013-08-07 | 华北电力大学 | Sub-module fault diagnosis method of modular multilevel converter |
| CN104218833A (en) * | 2014-05-26 | 2014-12-17 | 长沙理工大学 | Flexible voltage-sharing modulation method for capacitors of slave modules of modular multilevel converters |
| CN104597370A (en) * | 2015-02-16 | 2015-05-06 | 哈尔滨工业大学 | State observer-based detection method of open-circuit fault of IGBT (insulated gate bipolar transistor) of MMC (modular multilevel converter) |
-
2016
- 2016-04-25 CN CN201610262360.8A patent/CN105911327B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120001618A1 (en) * | 2008-11-03 | 2012-01-05 | Flextronics International Kft. | System for monitoring capacitor cells |
| CN102495292A (en) * | 2011-11-17 | 2012-06-13 | 北京鼎汉技术股份有限公司 | Method and circuit for online monitoring capacity state of bus capacitor |
| CN103235219A (en) * | 2013-04-17 | 2013-08-07 | 华北电力大学 | Sub-module fault diagnosis method of modular multilevel converter |
| CN104218833A (en) * | 2014-05-26 | 2014-12-17 | 长沙理工大学 | Flexible voltage-sharing modulation method for capacitors of slave modules of modular multilevel converters |
| CN104597370A (en) * | 2015-02-16 | 2015-05-06 | 哈尔滨工业大学 | State observer-based detection method of open-circuit fault of IGBT (insulated gate bipolar transistor) of MMC (modular multilevel converter) |
Non-Patent Citations (1)
| Title |
|---|
| 罗程 等: "MMC控制***时序逻辑与子模块故障监测", 《电力自动化设备》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370393A (en) * | 2017-06-29 | 2017-11-21 | 全球能源互联网研究院 | A kind of Modularized multi-level converter sub-module topological structure and its guard method |
| EP3609069A1 (en) * | 2018-08-06 | 2020-02-12 | General Electric Technology GmbH | Converter system |
| WO2020030431A1 (en) * | 2018-08-06 | 2020-02-13 | General Electric Technology Gmbh | Converter system |
| CN113114141A (en) * | 2021-04-26 | 2021-07-13 | 北京机械设备研究所 | Method, device and equipment for compensating power supply voltage of electric steering engine |
| CN113114141B (en) * | 2021-04-26 | 2024-06-07 | 北京机械设备研究所 | Method, device and equipment for compensating power supply voltage of electric steering engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105911327B (en) | 2018-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107839500B (en) | Lithium battery pack balance control method and system for dynamically correcting SOC | |
| CN105675957B (en) | A kind of measurement of MMC module voltages and Fault Locating Method based on status monitoring | |
| CN103941195B (en) | Method for battery SOC estimation based on small model error criterion expanding Kalman filter | |
| CN100334801C (en) | Three-level neutral point clamping PWM inverter and neutral point voltage controller | |
| CN103675426B (en) | Inductive current zero-crossing detection method, circuit and switch power supply with circuit | |
| CN105633956A (en) | Spiking neural network pseudo measurement modeling based three-phase state estimation method for power distribution network | |
| CN103698734A (en) | Method for testing virtual failures of intelligent ammeter based on simulation | |
| CN110289613A (en) | The identification of distribution net topology and line parameter circuit value discrimination method based on sensitivity matrix | |
| CN105911327A (en) | MMC module voltage measurement method having intelligent correction function | |
| CN110110461A (en) | IGBT method for parameter estimation in MMC based on Kalman filtering algorithm | |
| CN109921504A (en) | Vehicle-mounted mixed energy storage system and its non linear robust adaptive power control method | |
| CN106329969A (en) | Output voltage dynamic response optimization control applicable to Vienna rectifier | |
| CN203178354U (en) | Three-phase AC electronic quantities detection circuit suitable for one-chip microcomputer | |
| CN109193635A (en) | A kind of power distribution network topological structure method for reconstructing based on adaptive sparse homing method | |
| CN202204918U (en) | Temperature-compensation-based system on chip (SOC) accuracy improvement device | |
| CN102904466A (en) | Switching power supply controller | |
| CN106487258A (en) | A kind of control method of the three level neutral-point potential balance tape verifying corrections based on injected zero-sequence voltage | |
| CN104779670B (en) | It is a kind of to detect the method whether battery is full of | |
| CN106970269B (en) | Modularized multi-level converter sub-module local stray inductance extraction method and system | |
| CN111308232B (en) | System and method for measuring stray parameters of current loop of high-power current conversion module | |
| CN202735388U (en) | Current sensor control device | |
| CN117250436B (en) | Power distribution network traveling wave signal positioning method based on dynamic mode and double-end traveling wave method | |
| CN117131828B (en) | Digital twin identification method for passive parameters of boost converter | |
| CN207336643U (en) | A kind of electric car insulation detection device | |
| CN106677946A (en) | Device capable of detecting operating point of electromagnetic valve armature of oil sprayer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |