CN105911327B - A kind of MMC module voltage measuring methods with intelligent calibration function - Google Patents
A kind of MMC module voltage measuring methods with intelligent calibration function Download PDFInfo
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- CN105911327B CN105911327B CN201610262360.8A CN201610262360A CN105911327B CN 105911327 B CN105911327 B CN 105911327B CN 201610262360 A CN201610262360 A CN 201610262360A CN 105911327 B CN105911327 B CN 105911327B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of MMC module voltage measuring methods with intelligent calibration function, the output port voltage of two adjacent Series Sheet capacitance modules or a double capacitance modules is measured using a voltage sensor or measuring circuit, respective capacitance voltage value is calculated according to the operating status of tested module, and propose that voltage correction method is corrected the voltage of each self-capacitance, so as to reduce hardware cost and complexity, reliability is improved.The present invention is suitable for existing modulation and control strategy and is not limited by module operating status changing rule, adaptability is good, versatility is high, it is realized in module controller, other control functions of module are not influenced and do not increase master controller computation burden, suitable for containing the fields such as the application scenario compared with multimode MMC, such as D.C. high voltage transmission, electric propulsion.
Description
Technical field
The invention belongs to applied power electronics technical fields, are specifically designed a kind of MMC modules with intelligent calibration function
Voltage measurement method.
Background technology
With economic fast development, the gradually expansion of social production scale, various forms of electricity needs constantly increase,
Requirement to power electronic equipment is also higher and 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 small, device for power switching voltage stress is small, switching frequency is low
It is increasingly becoming the research hotspot of high-power electric power application field.With all-controlling power electronics device stress levels and appearance
The continuous promotion of amount so that the multiple voltage source converter that is formed using insulated gate bipolar transistor and applied to the big work(of high pressure
Rate occasion is possibly realized.Wherein Modular multilevel converter (modular multilevel converter, hereinafter referred
MMC) as shown in Figure 1, because being easy to dilatation with high modularization structure, there is common DC bus can improve system can
By property and advantageously reduce cost, it is insensitive to the stray parameter of main loop and be easily achieved, off-center operation ability therefore
Barrier pass through it is strong with recovery capability, the advantages that good output waveform 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, one bridge arm can even reach hundreds of module strings when voltage class is higher
Connection, and the capacitance voltage of each module is the important parameter that system control must acquire, so meaning that needs are more
Voltage sensor or hardware facilities, the hardware cost and complexity of system such as tension measuring circuit it is higher.Module voltage is MMC
Quantity is most in the parameter that acquires of system operation needs, therefore as can hardware complexity journey is reduced in terms of module voltage measurement
Degree, it will help the reliability service of system.As what MMC was studied gos deep into, go out to make the reasons such as MMC reply DC Line Faults
Existing double capacitance modules, find a kind of voltage measurement method suitable for the module be very it is necessary to.
In order to which the capacitance voltage to each module controls, in previous conventional method, need to measure all modules
Capacitance voltage.Existing module voltage measuring method is all that the capacitance voltage of each module is directly measured so that each
Module will have corresponding voltage sensor or tension measuring circuit, and hardware complexity and cost are all very big.Meanwhile existing one
Not only calculating process is complicated, but also accuracy is low for a little measuring methods, and versatility is low.
Invention content
Goal of the invention：For overcome the deficiencies in the prior art, the present invention provides a kind of versatility is more preferable, accuracy higher
The MMC module voltage measuring methods with intelligent calibration function.
Technical solution：The present invention provides a kind of MMC module voltage measuring methods with intelligent calibration function, including with
Lower step：
Step 1：Voltage sensor or voltage sampling circuit are arranged on to the output of the single capacitor module of two adjacent series connection
Port or the output port of double capacitance modules, this output port are sampled point；The single capacitor module or double of two adjacent series connection
Two modules are expressed as module 1 and module 2 in capacitance module；
Step 2：Module voltage measures initialization, sets each module voltage maximum threshold ucimaxref, module voltage
Minimum judges threshold value umin, correction index d's is initial, and 9 memory storage relevant parameters are selected in MMC systems；
Step 3：Voltage sensor or voltage sampling circuit start to measure sample amplitude when reproduced um；
Step 4：Determine the single capacitor module of two adjacent series connection operating status or double capacitance modules in two sub-modules
Operating status, with reference to the sample amplitude when reproduced u obtained in step 3mObtain the capacitance voltage value of each module；Wherein, with F1 tables
Show the operating status variable of module 1, the operating status variable of F2 representation modules 2；
Step 5：Judgement controls whether to terminate, the root if the master controller of MMC systems does not send out control END instruction
According to system control signal, continue cycling through and carry out step 3~step 4 measurement module voltage；If the master controller of MMC systems is sent out
END instruction is controlled, then finishing control；
Wherein, the method for the capacitance voltage value of each module of acquisition described in the step 4 is：
As F1=0 and F2=0, the capacitance voltage u in module 1c1Value in=M1, M1 expression first memory, first
Memory is used for the value of capacitance voltage in logging modle 1, the capacitance voltage u in module 2c2=M2, M2 are represented in second memory
Value, second memory be used for logging modle 2 in capacitance voltage value；Value in first memory and second memory is not more
Newly；It meanwhile will be in the state value storage to the 8th memory of current the first module and the second module；Wherein, the 8th memory
For recording the state value of the first module and the second module before an operating status variation, represented in the 8th memory with M8
Value；
As F1=1 and F2=0, the voltage u at sampled point is judgedmRange, if um≤uminOr um≥2umin, module
Capacitance voltage u in 1c1=M1, the capacitance voltage u in module 2c2=M2, the value in first memory and second memory is not more
Newly, continue to detect；If umin＜ um＜ 2umin, whether the calculation flag position for judging correction index is 1, wherein the
Nine memories are used for the flag bit of recording voltage correction coefficient, and the value in the 9th memory is represented with M9；If correction index
Calculation flag position for 1, then by the voltage u at sampled point at this timemIt stores into the 5th memory, M5 is represented in the 5th memory
Value, correction index d is calculated according to formula d=(| M5-M3 |)/(| M1+M2-M3-M4 |) and updates original voltage school
Positive coefficient, the 7th memory are used to store the value of correction index d, and M7 represents the value in the 7th memory, then by the 9th
The value of memory is updated to 0；Capacitance voltage u in module 1 at this timec1For the voltage value u at this sampled pointm, the electricity in module 2
Hold voltage uc2It is constant；The value in first memory is updated, and the first current module and the second mould will be stored in the 8th memory
The state value of block；If the calculation flag position of correction index is not 1, directly cause the capacitance voltage u in module 1c1For
This time voltage value u at sampled pointm, the capacitance voltage u in module 2c2It is constant；The value in first memory is updated, and by the 8th
The state value of the first current module and the second module is stored in memory；
As F1=0 and F2=1, the voltage u at sampled point is judgedmRange, if um≤uminOr um≥2umin, module
Capacitance voltage u in 1c1=M1, the capacitance voltage u in module 2c2=M2, the value in first memory and second memory is not more
Newly, continue to detect；If umin＜ um＜ 2umin, the calculation flag position of correction index is judged for 1, if voltage school
The calculation flag position of positive coefficient is 1, then by the voltage u at sampled point at this timemIt stores into the 6th memory, M6 represents that the 6th deposits
Value in reservoir；Correction index d is calculated according to formula 1-d=(| M6-M4 |)/(| M1+M2-M3-M4 |) and is updated original
Correction index, then by updated value storage in the 7th memory, then the value of the 9th memory is updated to 0；
Capacitance voltage u in module 2 at this timec2For the voltage value u at this sampled pointm, the capacitance voltage u in module 1c1It is constant；Update
Value in second memory, and store in the 8th memory the state value of the first current module and the second module；If pressure
The calculation flag position of correction coefficient is not 1, directly causes the capacitance voltage u in module 2c2For the voltage value at this sampled point
um, the capacitance voltage u in module 1c1It is constant；The value in second memory is updated, and stores in the 8th memory current the
The state value of one module and the second module；
As F1=1 and F2=1, judge to measure voltage umRange, if um≤2uminWhen, the capacitance voltage in module 1
uc1=M1, the capacitance voltage u in module 2c2=M2, the value in first memory and second memory do not update, continue to examine
It surveys；If um>2umin, whether an operating status is F1=1 and F2=0 or F1=0 and F2=1 or F1=0 and F2 before judgement
=0, if meeting one kind in three kinds of situations, the value in first memory at this time is stored into third memory, by this
When second memory in value storage in the 4th memory, the value in the 9th memory is updated to 1, represents that third stores with M3
Value in device, M4 represent the value in the 4th memory；And according to formula uv1=(Um- M1-M2) × M7 computing modules 1 voltage become
Change amount uv1, according to formula uv2=(Um- M1-M2) × (1-M7) computing module 2 voltage variety uv2；If three are not met
Kind situation, the voltage variety u of direct computing module 1v1With the voltage variety u of module 2v2, at this point, the capacitance electricity in module 1
Press uc1=M1+uv1, the capacitance voltage u in module 2c2=M2+uv2；And the capacitance voltage storage value of update module 1 and module 2；More
Value in new first memory and second memory, and the first current module and the second module will be stored in the 8th memory
State value.
Further, the initial value of the voltage correction system d is 0.5, after overvoltage correction coefficient d is calculated, will be calculated
Correction index d and the variation range of correction index d be compared, if the correction index d calculated exists
In variation range, then updated with the correction index d calculated to the value in the 7th memory, if correction index is not
In variation range, then the correction index in the 7th memory is not updated.Correction index reflects measured two
A module capacitance capacity ratio, in this way timing update correction index can make the result of measurement more accurate.
Further, the variation range of the correction index d is 0.4-0.6.The result for making measurement in this way is more accurate,
Effectively avoid the influence of the factors such as interference.
Further, when MMC normal operations, the operating status of the single capacitor module of two adjacent series connection in the step 4
Or in double capacitance modules two modules operating status according to the state of the on or off of each mould switching device in the block into
Row judges.
Further, when high voltage direct current side short trouble occurs for MMC, the single capacitor of two adjacent series connection in the step 4
The operating status of two modules is according to each module topology and by the module in the operating status of module or double capacitance modules
Current direction is set.
Further, the method for the acquisition current direction is：The capacitance voltage value of the module obtained twice recently is taken, with most
The module capacitance voltage value once obtained afterwards subtracts the second from the bottom capacitance voltage value obtained, according to the positive and negative values for obtaining result
Judge current direction Jing Guo the module, if it is the inflow of canonical electric current forward direction, if it is it is negative if electric current reversely flow into.
Further, the method for the acquisition current direction is：The current value that each bridge arm current measuring circuit is obtained, via
MMC master controllers are sent to the judgement that module controller carries out sense of current.
Further, the method for the acquisition current direction is：Voltage u at the collection pointmFrequency acquisition be not less than
Twice of the module equivalent switching frequency peak of measurement.
Further, the module voltage maximum threshold ucimaxrefFor 1.2 times of single capacitance voltage rated value, minimum is sentenced
Disconnected threshold value uminFor 0.8 times of single capacitance voltage rated value.
Operation principle：Present invention selection the single capacitor module of two adjacent series connection or the output port of double capacitance modules into
Then row voltage measurement obtains the voltage of each capacitance module respectively according to the voltage value for measuring acquisition.Obtaining each capacitance
During the voltage of module, the calculation formula of two kinds of correction index is provided, while refers to the flag bit of correction index
To determine whether calculating correction index, to the operating status of two modules, there is no limit judge simpler in this way.So as to
The result for making the voltage measurement of each capacitance module is more accurate..
Advantageous effect：Compared with prior art, The present invention reduces Rule of judgment, algorithm are optimized, not by operating status
The limitation of changing rule is applicable to various operating status changing rules, and versatility is more preferable, reliability higher.It can be in double electricity
There is good effect, and the voltage measurement method is suitably applied present institute in the measurement of appearance module voltage and fault diagnosis
The modulation strategy and control strategy of some MMC.
Description of the drawings
Fig. 1 is the whole functional block diagram of Modular multilevel converter；
Fig. 2 is four kinds of module topology structures contained there are two capacitance, wherein (a) represents two half-bridge single capacitor block coupled in series
Voltage acquisition point functional block diagram, (b) represents the voltage acquisition point functional block diagram of double capacitance modules, and (c) represents asymmetric and intersect
The voltage acquisition point functional block diagram of the double capacitance modules of type, (d) represents a half-bridge single capacitor module and a full-bridge single capacitor mould
The voltage acquisition point functional block diagram of block series connection；
Fig. 3 is the flow chart of measuring method provided by the invention；
Fig. 4 determines method schematic diagram for module status [F1 F2], wherein (a) represents the determining side under normal operation
Method schematic diagram, (b) represent the determining method schematic diagram in the case of drive signal block.
Specific embodiment
Further explanation is done to the present invention below in conjunction with the accompanying drawings.
Embodiment：
Single capacitor of all module output voltages of the method provided by the invention suitable for MMC more than or equal to 0 or double electricity
Molar block.
Double capacitance modules as shown in Fig. 2 (b) can be considered as the simplification of a variety of double capacitance modules when module works normally
Or equivalent topologies, and it is identical with two half-bridge single capacitor block coupled in series topology operation principles as shown in Fig. 2 (a), therefore with such as
For double capacitance modules shown in Fig. 2 (b).
A kind of voltage acquisition point of the MMC module voltages measuring method proposed is selected in double capacitances as shown in Fig. 2 (b)
The output port of module, method provided by the invention are realized in the module controller of MMC systems.
As shown in figure 3, a kind of MMC module voltages measuring method comprises the steps of：
Step 1：Voltage sensor or voltage sampling circuit are arranged on to the output port of double capacitance modules, this output port
For sampled point；Two modules are expressed as module 1 and module 2 in double capacitance modules；
Step 2：Module voltage measures initialization, sets each module voltage maximum threshold ucimaxrefFor 1.2 times of list
A capacitance voltage rated value, the minimum of module voltage judge threshold value uminFor 0.8 times of single capacitance voltage rated value, because
For module capacitance, clocking requirement capacitance is equal, therefore the initial value of correction index d is set as 0.5, and in MMC systems setting
Middle 9 memory storage relevant parameters of selection；Wherein, in correction index d storages to the 7th memory, 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
In more than twice of surveyed module equivalent switching frequency peak.
Step 4：The operating status of two modules in double capacitance modules is determined, with reference to the sample amplitude when reproduced obtained in step 3
umObtain the capacitance voltage value of each module；Wherein, the operating status of double capacitance modules is represented with [F1 F2], F1 representation modules 1
Operating status variable, the operating status variable of F2 representation modules 2.
During MMC normal operations, as shown in Fig. 4 (a), on or off time, the voltage signal acquisition of switching device are considered
With the time delay of reading, the operating status of module can be represented with mould switching drive signal in the block during normal operation, mould
The switching drive signal of T1 and T2 is complementary in block 1, and when T1 is connected, the output of module 1 is positive voltage, and the F1=1 after delay, T1 are closed
When disconnected, the output of module 1 is 0, by postponing F1=0.Similarly, the switching drive signal of T3 and T4 is complementary in module 2, T3 conductings
When, the output of module 2 is positive voltage, and when the F2=1 after delay, T3 are turned off, the output of module 2 is 0, by postponing F2=0.
If high voltage direct current side short trouble occurs for MMC, at this time the drive signal of all switching devices will be blocked or
Short trouble occurs in itself for module switch device, blocks the drive signal of the module switch device for protection system, this
The drive signal of switching device is blocked the working condition of the measurement no longer judgment module switching device of module voltage in the case of kind,
But as shown in Fig. 4 (b), the value of [F1 F2] is set according to different module topology types and the current direction Jing Guo the module,
Then module voltage is measured according to the value binding modules voltage universal measurement method of [F1 F2].Wherein current direction signal can be with
By the current value that each bridge arm current measuring circuit to MMC master controllers is sent to obtain, module control is sent to via MMC master controllers
Device processed carries out judgement sense of current, can also be judged according to the module voltage that record measures twice recently, be surveyed with last time
Voltage subtract the voltage second from the bottom time measured, flowed into if it is canonical electric current forward direction, if it is it is negative if electric current reverse flow
Enter.The switching device drive signal of the series topology of two half-bridge single capacitor modules as shown in Fig. 2 (a), module 1 and module 2
The value of [F1 F2] after being all blocked is set as [1 1] when electric current forward direction flows into the topology, and electric current reverse flow is fashionable to be set as
[0 0], it is assumed that the switching device drive signal for there was only module 1 in the topology is blocked, and module 2 works normally, then [F1 F2]
Value be set as when electric current forward direction flows into the topology [1 F2], electric current reverse flow is fashionable to be set as [0 F2], wherein F2 represent
The operating status of module 2；The topological structure of double capacitance modules as shown in Fig. 2 (b), the drive signal of all switching devices are sealed
The value of [F1 F2] after lock is set as [1 1] electric current forward stream is fashionable, and reverse flow is fashionable to be set as [0 0]；Such as Fig. 2 (c) institutes
The topological structure of the double capacitance modules of the asymmetric chiasma type that shows, the drive signals of all switching devices be blocked after [F1 F2]
Value no matter current direction how to be all set to [1 1]；A half-bridge single capacitor module as shown in Fig. 2 (d) and one it is complete
The topological structure of bridge single capacitor block coupled in series, the drive signals of all switching devices be blocked after [F1 F2] value in electric current
Forward stream is fashionable to be set as [1 1], and reverse flow is fashionable to be 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 memory is used for the value of capacitance voltage in logging modle 1, the capacitance voltage u in module 2c2=M2, M2 represent second memory
In value, second memory be used for logging modle 2 in capacitance voltage value；Value in first memory and second memory is not more
Newly；Meanwhile the 8th state value for storing the first current module and the second module in memory, i.e. M8=[F1 F2]；Wherein,
8th memory represents that the 8th deposits for recording the state value of the first module and the second module before an operating status variation with M8
Value in reservoir；
When [F1 F2]=[1 0], the voltage u at sampled point is judgedmRange, if um≤uminOr um≥2umin, mould
Capacitance voltage u in block 1c1=M1, the capacitance voltage u in module 2c2=M2, the value in first memory and second memory is not
Update, continues to detect；If umin＜ um＜ 2umin, judge whether M9=1, wherein the 9th memory is used for recording voltage
The calculation flag position of correction coefficient represents the value in the 9th memory with M9, if M9=1, by the electricity at sampled point at this time
Press umIt stores into the 5th memory, M5 represents the value in the 5th memory；Then according to formula d=(| M5-M3 |)/(| M1+
M2-M3-M4 |) calculate correction index d.Wherein, M3 represents the value in third memory, and M4 is represented in the 4th memory
It is worth, rated value of the initial value for 1 capacitance voltage of module in third memory, initial value is 2 capacitance voltage of module in the 4th memory
Rated value.In order to avoid the influence of the factors such as interference, before the value in updating the 7th memory, the voltage preferably to calculating
Correction coefficient d is judged.The error of module capacitance is up to 20% under normal circumstances in engineering, therefore is 20% in error
When, the variation range of correction index is 0.4-0.6, so correction index should within this range, if voltage correction
Coefficient then stores the new correction index that this is calculated into the 7th memory, in variation range if electric
Correction coefficient is pressed not in variation range, then this does not update correction index, and correction index is still to be stored in the 7th
Value in memory.Then the value of the 9th memory is updated to 0；Capacitance voltage u in module 1 at this timec1At this sampled point
Voltage value um, the capacitance voltage u in module 2c2It is constant；The value in first memory is updated, is stored in the 8th memory current
The first module and the second module state value；If M9=0, directly cause the capacitance voltage u in module 1c1For this sampling
Voltage value u at pointm, the capacitance voltage u in module 2c2It is constant；The value in first memory is updated, and will be in the 8th memory
The state value of the first current module of storage and the second module；
When [F1 F2]=[0 1], the voltage u at sampled point is judgedmRange, if um≤uminOr um≥2umin, mould
Capacitance voltage u in block 1c1=M1, the capacitance voltage u in module 2c2=M2, the value in first memory and second memory is not
Update, continues to detect；If umin＜ um＜ 2umin, judge whether (M9=1), it, will sampled point at this time if M9=1
The voltage u at placemIt stores into the 6th memory, M6 represents the value in the 6th memory；Then according to formula 1-d=(| M6-M4
|)/(| M1+M2-M3-M4 |) calculate correction index d, the correction index d and correction index that then will be calculated
Variation range be compared, if this calculated in the range of 0.4-0.6 in the correction index d calculated
To new correction index storage to the 7th memory in, if the correction index d calculated is not in 0.4-0.6 models
In enclosing, then this does not update correction index, and correction index is still the value being stored in the 7th memory, meanwhile, it will
The value of 9th memory is updated to 0；Capacitance voltage u in module 2 at this timec2For the voltage value u at this sampled pointm, in module 1
Capacitance voltage uc1It is constant；The value in second memory is updated, the first current module and the second mould are stored in the 8th memory
The state value of block；If M9=0, directly cause the capacitance voltage u in module 2c2For the voltage value u at this sampled pointm, module
Capacitance voltage u in 1c1It is constant；The value in second memory is updated, current the first module and second is stored in the 8th memory
The state value of module；
When [F1 F2]=[1 1], judge to measure voltage umRange, if um≤2uminWhen, the capacitance electricity in module 1
Press uc1=M1, the capacitance voltage u in module 2c2=M2, the value in first memory and second memory are not updated, are continued
Detection；If um>2umin, judge whether M8 is equal to [1 0] or [0 1] or [1 1], if meeting one kind in three kinds of situations,
Then by the value storage to third memory in first memory at this time, the value in second memory at this time is stored to the 4th and is deposited
In reservoir, the value in third memory is represented with M3, M4 represents the value in the 4th memory, and the value in the 9th memory is updated to
1；That is M3=M1, M4=M2, M9=1；Then the voltage variety u of computing module 1v1With the voltage variety u of module 2v2；Such as
Fruit does not meet three kinds of situations, the voltage variety u of direct computing module 1v1With the voltage variety u of module 2v2, wherein, uv1
=(Um- M1-M2) × M7, uv2=(Um-M1-M2)×(1-M7).At this point, the capacitance voltage u in module 1c1=M1+uv1, module 2
In capacitance voltage uc2=M2+uv2；And the capacitance voltage storage value of update module 1 and module 2；Update first memory and the
Value in two memories, and the state value for the first current module and the second module being stored in the 8th memory.
Step 5：Judgement controls whether to terminate, the root if the master controller of MMC systems does not send out control END instruction
According to system control signal, continue cycling through and carry out step 3~step 4 measurement module voltage；If the master controller of MMC systems is sent out
END instruction is controlled, then finishing control.
Correction index reflects two measured module capacitance capacity ratios, and the opposite variation of this value is smaller, is
Can be simpler, acquisition voltage value quickly and accurately can pass through the side of timing or metering in practical implementation
Method reduces correction index operation times, i.e., if kept not after in the correction index long period or repeatedly calculating
Become, then correction index can be calculated again every one section of run time or after counting.
Claims (9)
1. a kind of MMC module voltage measuring methods with intelligent calibration function, it is characterised in that：Include the following steps：
Step 1：Voltage sensor or voltage sampling circuit are arranged on to the output port of the single capacitor module of two adjacent series connection
Or the output port of double capacitance modules, this output port are sampled point；The single capacitor module of two adjacent series connection or double capacitances
Two modules are expressed as module 1 and module 2 in module；
Step 2：Module voltage measures initialization, sets each module voltage maximum threshold ucimaxref, the minimum of module voltage
Judge threshold value umin, the initial value of correction index d, and 9 memory storage relevant parameters are selected in MMC systems；
Step 3：Voltage sensor or voltage sampling circuit start to measure sample amplitude when reproduced um；
Step 4：Determine the operating status of the single capacitor module of two adjacent series connection or the fortune of two sub-modules in double capacitance modules
Row state, with reference to the sample amplitude when reproduced u obtained in step 3mObtain the capacitance voltage value of each module；Wherein, mould is represented with F1
The operating status variable of block 1, the operating status variable of F2 representation modules 2；
Step 5：Judgement controls whether to terminate, according to being if the master controller of MMC systems does not send out control END instruction
System control signal, continues cycling through and carries out step 3 ~ step 4 measurement module voltage；If the master controller of MMC systems sends out control
END instruction, then finishing control；
Wherein, the method for the capacitance voltage value of each module of acquisition described in the step 4 is：
As F1=0 and F2=0, the capacitance voltage u in module 1c1=M1, M1 represent the value in first memory, and first memory is used
The value of capacitance voltage in logging modle 1, the capacitance voltage u in module 2c2Value in=M2, M2 expression second memory, second
Memory is used for the value of capacitance voltage in logging modle 2；Value in first memory and second memory does not update；It meanwhile will
In the state value storage to the 8th memory of current the first module and the second module；Wherein, the 8th memory is for record one
The state value of first module and the second module before secondary operating status variation, the value in the 8th memory is represented with M8；
As F1=1 and F2=0, the voltage u at sampled point is judgedmRange, if um≤uminOr um≥2umin, in module 1
Capacitance voltage uc1=M1, the capacitance voltage u in module 2c2=M2, the value in first memory and second memory do not update, and continue
It is detected；If umin＜ um＜ 2umin, whether the calculation flag position for judging correction index is 1, wherein the 9th memory
For the flag bit of recording voltage correction coefficient, the value in the 9th memory is represented with M9；If the calculating of correction index
Flag bit is 1, then by the voltage u at sampled point at this timemIt storing into the 5th memory, M5 represents the value in the 5th memory,
According to formula d=（|M5-M3|）/（|M1+M2-M3-M4|）It calculates correction index d and updates original voltage correction system
Number, the 7th memory are used to store the value of correction index d, and M7 represents the value in the 7th memory, then by the 9th storage
The value of device is updated to 0；Capacitance voltage u in module 1 at this timec1For the voltage value u at this sampled pointm, the capacitance electricity in module 2
Press uc2It is constant；The value in first memory is updated, and the first current module and the second module will be stored in the 8th memory
State value；If the calculation flag position of correction index is not 1, directly cause the capacitance voltage u in module 1c1It is adopted for this
Voltage value u at sampling pointm, the capacitance voltage u in module 2c2It is constant；The value in first memory is updated, and by the 8th memory
The state value of the first current module of middle storage and the second module；
As F1=0 and F2=1, the voltage u at sampled point is judgedmRange, if um≤uminOr um≥2umin, in module 1
Capacitance voltage uc1=M1, the capacitance voltage u in module 2c2=M2, the value in first memory and second memory do not update, and continue
It is detected；If umin＜ um＜ 2umin, the calculation flag position of correction index is judged for 1, if correction index
Calculation flag position is 1, then by the voltage u at sampled point at this timemIt stores into the 6th memory, M6 is represented in the 6th memory
Value；According to formula 1-d=（|M6-M4|）/（|M1+M2-M3-M4|）It calculates correction index d and updates original voltage school
Then updated value is stored into the 7th memory, then the value of the 9th memory is updated to 0 by positive coefficient；Module 2 at this time
In capacitance voltage uc2For the voltage value u at this sampled pointm, the capacitance voltage u in module 1c1It is constant；Update second memory
In value, and store in the 8th memory the state value of the first current module and the second module；If press correction coefficient
Calculation flag position is not 1, directly causes the capacitance voltage u in module 2c2For the voltage value u at this sampled pointm, in module 1
Capacitance voltage uc1It is constant；The value in second memory is updated, and current the first module and second is stored in the 8th memory
The state value of module；
As F1=1 and F2=1, judge to measure voltage umRange, if um≤2uminWhen, the capacitance voltage u in module 1c1=M1,
Capacitance voltage u in module 2c2=M2, the value in first memory and second memory do not update, continue to detect；If um
>2umin, whether an operating status is F1=1 and F2=0 or F1=0 and F2=1 or F1=0 and F2=0 before judgement, if meeting three kinds
One kind in situation then stores the value in first memory at this time into third memory, will be in second memory at this time
In value storage to the 4th memory, the value in the 9th memory is updated to 1, represents the value in third memory with M3, M4 is represented
Value in 4th memory；And according to formula uv1=（Um- M1-M2) × M7 computing modules 1 voltage variety uv1, according to formula
uv2=（Um- M1-M2) × (1-M7) computing module 2 voltage variety uv2；If not meeting three kinds of situations, mould is directly calculated
The voltage variety u of block 1v1With the voltage variety u of module 2v2, at this point, the capacitance voltage u in module 1c1=M1+uv1, module 2
In capacitance voltage uc2=M2+uv2；And the capacitance voltage storage value of update module 1 and module 2；Update first memory and second
Value in memory, and the state value for the first current module and the second module being stored in the 8th memory.
2. the MMC module voltage measuring methods with intelligent calibration function according to claim 1, it is characterised in that：Institute
It is 0.5 to state the initial value of voltage correction system d, after overvoltage correction coefficient d is calculated, by the correction index d calculated and
The variation range of correction index d is compared, if the correction index d calculated uses tricks in variation range
The correction index d updates of calculating to the value in the 7th memory, if correction index not in variation range, no
Update the correction index in the 7th memory.
3. the MMC module voltage measuring methods with intelligent calibration function according to claim 2, it is characterised in that：Institute
The variation range for stating correction index d is 0.4-0.6.
4. the MMC module voltage measuring methods with intelligent calibration function according to claim 1, it is characterised in that：When
During MMC normal operations, in the step 4 two in the operating status of the single capacitor module of two adjacent series connection or double capacitance modules
The operating status of module is judged according to the state of the on or off of each mould switching device in the block.
5. the MMC module voltage measuring methods with intelligent calibration function according to claim 1, it is characterised in that：When
When high voltage direct current side short trouble occurs for MMC, the operating status or double of the single capacitor module of two adjacent series connection in the step 4
Current direction of the operating status of two modules according to each module topology and Jing Guo the module is set in capacitance module.
6. the MMC module voltage measuring methods with intelligent calibration function according to claim 5, it is characterised in that：Institute
Stating the method for obtaining current direction is：The capacitance voltage value of the module obtained twice recently is taken, the module obtained with last time
Capacitance voltage value subtracts the second from the bottom capacitance voltage value obtained, is judged according to the positive and negative values for obtaining result by the module
Current direction, if it is canonical electric current forward direction flow into, if it is it is negative if electric current reversely flow into.
7. the MMC module voltage measuring methods with intelligent calibration function according to claim 5, it is characterised in that：Institute
Stating the method for obtaining current direction is：The current value that each bridge arm current measuring circuit is obtained, is sent to via MMC master controllers
Module controller carries out the judgement of sense of current.
8. the MMC module voltage measuring methods with intelligent calibration function according to claim 1, it is characterised in that：Institute
Stating the method for obtaining current direction is：Voltage u at the sampled pointmFrequency acquisition not less than measure module equivalent switch
Twice of frequency peak.
9. the MMC module voltage measuring methods with intelligent calibration function according to claim 1, it is characterised in that：Institute
State module voltage maximum threshold ucimaxrefFor 1.2 times of single capacitance voltage rated value, minimum judges threshold value uminIt is 0.8
Single capacitance voltage rated value again.
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