CN109818508A - A kind of flexible direct current converter valve submodule voltage control method and device - Google Patents
A kind of flexible direct current converter valve submodule voltage control method and device Download PDFInfo
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- CN109818508A CN109818508A CN201711154488.3A CN201711154488A CN109818508A CN 109818508 A CN109818508 A CN 109818508A CN 201711154488 A CN201711154488 A CN 201711154488A CN 109818508 A CN109818508 A CN 109818508A
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Abstract
The present invention provides a kind of flexible direct current converter valve submodule voltage control method and device, by the way that the different types of submodule of each bridge arm of flexible direct current transmission converter valve is grouped, one valve control device of every group of correspondence, the submodule number that the top level control device of valve control puts into operation according to the weight calculation each group of each group, later, irrelevance of the voltage relative to submodule voltage rating is grouped according to each submodule, calculated weight before is dynamically adjusted, the maximum normal-sub number of modules that can finally put into operation in conjunction with corresponding bridge arm calculates the submodule number that final each group puts into operation, it is handed down to valve control device, to solve to be grouped submodule over-voltage or under-voltage situation caused by submodule voltage changed slowly due to weights influence investment number in flexible HVDC transmission system dynamic process, valve control device is according to existing literature Pressure strategy and the gating method work provided.
Description
Technical field
The invention belongs to power electronics field, in particular to a kind of flexible direct current converter valve submodule voltage controlling party
Method and device.
Background technique
With the development of power electronics technology, the flexible DC transmission technology based on modularization multi-level converter obtains
Extremely wide research and application.The bridge arm of type topology uses the cascade form of basic running unit, avoids a large amount of derailing switches
The problems such as part is directly connected, and there is no driving consistency, significantly reduces the technical barrier of direct current transportation.For a large amount of concatenated
Submodule unit needs to carry out Pressure and Control to it.
The method that submodule presses strategy to generally use submodule capacitor voltage sequence at present, but work as bridge arm submodule quantity
Excessively, the time overhead accounting of sort algorithm is excessive, and the load factor of valve control device is excessively high, and with the raising of voltage class, son
The number of module is correspondingly improved, and the time overhead of sort algorithm will increase in geometry grade.On the other hand, due to each submodule
It requires to be communicated with valve control device, valve control device and the communication interface of submodule will also increase with the increase for linking number
Greatly, and the dilatation of hardware will cause the significantly promotion of cost, will also result in the promotion of development cycle, is unfavorable for valve control device
Dilatation.
Meanwhile in order to restart after solving the problems, such as DC line fault, the submodule of various topological classifications also emerges one after another, from
The half-bridge submodule (HB-MMC) on basis develops to full-bridge submodule (FB-MMC), class full-bridge submodule (SFB-MMC) etc..It is based on
The modularization multi-level converter switching device of full-bridge submodule is more, and switching device utilization rate is not high, and running wastage is big.In order to
Realize the economy of flexible DC transmission technology and the characteristic that DC Line Fault is removed, patent WO2012103936A1, which is proposed, to be based on
Mixed type module multilevel converter (HBFB-MMC) scheme of half-bridge and full-bridge submodule, has both HB-MMC and FB-MMC
The advantages of, switching device about 1/4 also is reduced than FB-MMC scheme while with DC Line Fault Scavenging activity.Similar to half-bridge
With the inverter scheme that coexists of multiple types submodule of full-bridge mixing also by be future development direction, but due to each type
Submodule charge-discharge characteristic it is inconsistent, bring difficulty for the pressure of multiple types submodule.
Patent CN201210451946 proposes a kind of " submodule grouping Pressure and Control side of modularization multi-level converter
Method ", the invention carry out average packet to submodule, calculate each group total voltage and calculate the energy balance factor of each group, to count
It calculates and obtains the submodule number that each group needs to put into.This algorithm requires average packet, does not account for operational process and son occurs
The case where normal-subs number of modules dynamic changes such as module failure bypass.
Patent " 201410768743.3 " proposes " a seed module distributed control method ", for patent
The deficiency of " CN201210451946 " is proposed according to the dynamic change of normal-sub number of modules and a kind of weight method and is counted
The submodule number for calculating investment is only applicable to the submodule grouping of single type, and there is no consider the grouping of multiple types submodule
The inconsistent situation of pressure and charge characteristic afterwards.When electric current change dramatically, voltage can phase between different types of submodule
Difference is very big, results even in submodule over-voltage tripping, influences the stability of system operation.
It is therefore desirable to find a kind of solution for having engineer application feasibility, the load factor of valve control device is reduced,
The extendible capacity for improving valve control device solves the problems, such as that the submodule voltage of system dynamic course neutron different grouping is uneven, should
Scheme is suitable for different type submodule mixed configuration.
Summary of the invention
The purpose of the present invention is to provide a kind of flexible direct current converter valve submodule voltage control method and device, avoids
The problem of increase of factor Module Links number and bring valve control device load factor increase avoids the dilatation of valve control device hardware and band
The cost and development cycle problem come, avoid submodule voltage-sharing when different type submodule mixed configuration.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of flexible direct current converter valve submodule voltage control method, by the different types of submodule of each bridge arm of converter valve
Block is divided into M group, and M is natural number, M >=1, and every group of institute's molecular modules number is For natural number,I is grouping
Serial number and 1≤i≤M, one valve control device of every group of correspondence, each valve control device independent operating are filled from upper controller to valve control
The number for issuing submodule investment is set, steps are as follows for the number calculating of submodule investment:
(1) upper controller calculates total submodule number that corresponding bridge arm should be put intoWherein vref
For real-time reference wave, UCNFor single submodule voltage rating；
(2) total submodule number that upper controller should be put into according to step (1) bridge arm calculatedAnd it is administrative
The weight B of valve control devicei, calculate the submodule number of each valve control device investmentWherein round is
Round function；
(3) upper controller calculates the submodule average voltage of administrative valve control deviceRelative to voltage rating UCNIt is inclined
From degree ki,
(4) judge that upper controller calculates maximum deviation degree kmaxWith minimum irrelevance kminDifference whether be greater than valve control device
The setting value k of set submodule average voltage irrelevanceN, according to the submodule average voltage of valve control device relative to specified
The weight B of the irrelevance of voltage, valve control deviceiAnd the submodule number that bridge arm current direction need to put into each valve control device
The maximum normal-sub number of modules for dynamically being adjusted, and being put into operation in conjunction with corresponding bridge arm calculates final each group investment
The submodule number of operation, is handed down to each valve control device.
Step (4) described in a kind of above-mentioned flexible direct current converter valve submodule voltage control method is to sub- number of modules tune
Whole method particularly includes:
(41) if kmax-kmin< kN, then the submodule number for each valve control device investment for keeping the step (2) to calculate is not
Become；If kmax-kmin≥kN, then maximum deviation degree kmaxWith minimum irrelevance kminThe submodule number of corresponding valve control device investment
Mesh needs to be adjusted by step (42)；
(42) upper controller acquires bridge arm current IarmAnd judge direction, work as kmax-kmin≥kNWhen, if charging direction,
Then the submodule number of the investment of valve control device corresponding to maximum deviation degree is reduced to 0, and the submodule number for reducing investment increases
Into the submodule number of the investment of valve control device corresponding to minimum irrelevance；If bridge arm current IarmDirection is course of discharge,
Then the submodule number of valve control device investment corresponding to minimum irrelevance is reduced to 0, and the submodule number for reducing investment increases
Into the submodule number of the investment of valve control device corresponding to maximum deviation degree；
(43) if the valve control device according to corresponding to the maximum or minimum irrelevance that step (42) is calculated investment
Submodule number is more than the maximum normal-sub number of modules that it can put into, then valve control corresponding to maximum or minimum irrelevance
The maximum normal-sub number of modules that the submodule number of device investment can put into for it, the submodule put into needed for remaining
Number is by the weight distribution of other valve control devices in addition to the present apparatus to other valve control devices；
(44) it in submodule number input by the calculated each valve control device of last upper controller, is only capable of generating just
The grouping of voltage, the calculated submodule number of upper controller should meet relational expression:Positive pressure can be generated
Also the grouping of negative pressure can be generated, the calculated submodule number of upper controller meets relational expressionWhenWhen, show that the grouping valve control device needs the submodule put into generate positive voltage, whenWhen, show the grouping
The submodule that valve control device needs to put into generates no-voltage, whenWhen, show the son that the grouping valve control device needs to put into
Module generates negative voltage, and the submodule number of all grouping investments should meet relational expression
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the sub-module types are identical or not
Together, sub-module types include half-bridge submodule, full-bridge submodule, class full-bridge submodule.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the principle of the grouping is a seed type
Submodule be individually divided into one group or be divided into multiple groups, but every group of submodule only allows the submodule unit there are single type.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the principle of the grouping are as follows: every group pair
The normal-sub number of modules answered is equal or unequal, allows every group of normal-sub number of modules dynamic change.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, different types of submodule puts into operation
When can generate positive and negative different voltage, for can generate negative pressure submodule be grouped, allow upper controller finally calculate
The submodule investment number of the grouping out is negative, and the submodule for that cannot generate negative pressure is grouped, if upper controller calculates
Its submodule number put into is negative, then needs to be adjusted the number that it puts into, the negative submodule number of investment becomes
0, negative number is allocated by the valve control device that can generate negative pressure by weight.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the normal submodule is that can participate in
The submodule of normal switching, does not include the submodule of bypass, blocking.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the upper controller control 1 or
The multiple bridge arm units of person.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, charging side described in the step (42)
To bridge arm current direction when referring to that submodule voltage rises, the course of discharge refers to the bridge arm electricity when decline of submodule voltage
Flow direction.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the submodule average voltage deviates
The setting value k of degreeN≤ 40%.
A kind of flexible direct current converter valve submodule voltage-operated device, including submodule grouped element, submodule number are thrown
Enter computing unit, weight calculation unit, irrelevance computing unit, submodule number investment adjustment unit, bridge arm current direction are sentenced
Disconnected unit, submodule put into number issuance unit, wherein
The different types of submodule of each bridge arm of converter valve is divided into M group by the submodule grouped element, and M is nature
Number, M >=1, every group of institute's molecular modules number are For natural number,I be grouping serial number and 1≤i≤M, often
The corresponding valve control device of group, each valve control device independent operating issue submodule investment from upper controller to valve control device
Number；
The submodule number puts into unit, the total submodule number that should be put into for calculating corresponding bridge armWherein vrefFor real-time reference wave, UCNFor single submodule voltage rating；
The weight calculation unit calculates the weight B of administrative valve control device according to existing weighing computation methodiAnd root
The total submodule number that should be put into according to submodule number investment computing unit bridge arm calculatedCalculate each valve control device
The submodule number of investmentWherein round is round function；
The irrelevance computing unit calculates the submodule average voltage of administrative valve control deviceRelative to voltage rating
UCNIrrelevance ki,And calculate maximum deviation degree kmaxWith minimum irrelevance kminDifference whether be greater than valve control fill
Set the setting value k of set submodule average voltage irrelevanceN；
The bridge arm current walking direction unit is used to judge the direction of bridge arm current collected；
The submodule number puts into adjustment unit, puts into the calculated total son of computing unit according to submodule number
Module puts into number, and the weight and irrelevance computing unit of the calculated each valve control device of weight calculation unit calculate
Irrelevance weight calculation unit is calculated every in conjunction with bridge arm current direction judging unit calculated bridge arm current direction
The submodule number that a valve control device need to be put into is adjusted, and the normal submodule of maximum that can be put into operation in conjunction with corresponding bridge arm
Number generates final submodule investment number, is handed down to each valve control device by submodule investment number issuance unit.
The submodule puts into number issuance unit, and receiving submodule number puts into the final submodule that adjustment unit generates
Block investment number is handed down to each valve control device.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the submodule number investment adjustment is single
Member adjusts sub- number of modules method particularly includes:
(41) if kmax-kmin< kN, then the submodule number is kept to put into each valve control device of computing unit calculating in advance
The submodule invariable number of investment；If kmax-kmin≥kN, then maximum deviation degree kmaxWith minimum irrelevance kminCorresponding valve control
The submodule number of device investment needs to be adjusted by step (42)；
(42) upper controller acquires bridge arm current IarmAnd judge direction, work as kmax-kmin≥kNWhen, if charging direction,
Then the submodule number of the investment of valve control device corresponding to maximum deviation degree is reduced to 0, and the submodule number for reducing investment increases
Into the submodule number of the investment of valve control device corresponding to minimum irrelevance；If bridge arm current IarmDirection is course of discharge,
Then the submodule number of valve control device investment corresponding to minimum irrelevance is reduced to 0, and the submodule number for reducing investment increases
Into the submodule number of the investment of valve control device corresponding to maximum deviation degree；
(43) if the valve control device according to corresponding to the maximum or minimum irrelevance that step (42) is calculated investment
Submodule number is more than the maximum normal-sub number of modules that it can put into, then valve control corresponding to maximum or minimum irrelevance
The maximum normal-sub number of modules that the submodule number of device investment can put into for it, the submodule put into needed for remaining
Number is by the weight distribution of other valve control devices in addition to the present apparatus to other valve control devices；
(44) it in submodule number input by the calculated each valve control device of last upper controller, is only capable of generating just
The grouping of voltage, the calculated submodule number of upper controller should meet relational expression:Positive pressure can be generated
Also the grouping of negative pressure can be generated, the calculated submodule number of upper controller meets relational expressionWhenWhen, show that the grouping valve control device needs the submodule put into generate positive voltage, whenWhen, show the grouping
The submodule that valve control device needs to put into generates no-voltage, whenWhen, show the son that the grouping valve control device needs to put into
Module generates negative voltage, and the submodule number of all grouping investments should meet relational expression
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the sub-module types are identical or not
Together, sub-module types include half-bridge submodule, full-bridge submodule, class full-bridge submodule.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the principle of the grouping is a seed type
Submodule be individually divided into one group or be divided into multiple groups, but every group of submodule only allows the submodule unit there are single type.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the principle of the grouping are as follows: every group pair
The normal-sub number of modules answered is equal or unequal, allows every group of normal-sub number of modules dynamic change.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, different types of submodule puts into operation
When can generate positive and negative different voltage, for can generate negative pressure submodule be grouped, allow upper controller finally calculate
The submodule investment number of the grouping out is negative, and the submodule for that cannot generate negative pressure is grouped, if upper controller calculates
Its submodule number put into is negative, then needs to be adjusted the number that it puts into, the negative submodule number of investment becomes
0, negative number is allocated by the valve control device that can generate negative pressure by weight.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the normal submodule is that can participate in
The submodule of normal switching, does not include the submodule of bypass, blocking.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the upper controller control 1 or
The multiple bridge arm units of person.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, charging side described in the step (42)
To bridge arm current direction when referring to that submodule voltage rises, the course of discharge refers to the bridge arm electricity when decline of submodule voltage
Flow direction.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the submodule average voltage deviates
The setting value k of degreeN≤ 40%.
After adopting the above scheme, the invention has the benefit that
(1) load factor of valve control device is greatly lowered, improves the reliability of valve control device；
(2) the hardware dilatation for avoiding valve control device, to reduce development cycle and development cost；
(3) the submodule equalizing effect of the inverter of different type submodule mixed configuration is improved；
(4) grouping submodule voltage in flexible HVDC transmission system dynamic process is solved to become since weights influence puts into number
Changed slow caused submodule over-voltage or under-voltage situation.
Detailed description of the invention
Fig. 1 is submodule distributed control structure figure, and VBC is valve control device in figure, and SM is submodule；
Fig. 2 is half-bridge submodule schematic diagram；
Fig. 3 is full-bridge submodule schematic diagram；
Fig. 4 is class full-bridge submodule schematic diagram.
Specific embodiment
Below with reference to drawings and the specific embodiments, technical solution of the present invention is described in detail.
A kind of flexible direct current converter valve submodule voltage control method, as shown in Figure 1, by the difference of each bridge arm of converter valve
The submodule of type is divided into M group, and M is natural number, M >=1, and every group of institute's molecular modules number is For natural number,I is grouping serial number and 1≤i≤M, one valve control device of every group of correspondence, each valve control device independent operating, by upper layer
Controller issues the number that submodule is put into valve control device, and steps are as follows for the number calculating of submodule investment
(1) upper controller calculates total submodule number that corresponding bridge arm should be put intoWherein vref
For real-time reference wave, UCNFor single submodule voltage rating；
(2) total submodule number that upper controller should be put into according to step (1) bridge arm calculatedAnd it is administrative
The weight B of valve control devicei, according to existing method, such as weight may be selectedCalculate each valve control device investment
Submodule numberWherein round is round function；
(3) upper controller calculates the submodule average voltage of administrative valve control deviceRelative to voltage rating UCNIt is inclined
From degree ki,
(4) judge that upper controller calculates maximum deviation degree kmaxWith minimum irrelevance kminDifference whether be greater than valve control device
The setting value k of set submodule average voltage irrelevanceN, according to the submodule average voltage of valve control device relative to specified
The weight B of the irrelevance of voltage, valve control deviceiAnd the submodule number that bridge arm current direction need to put into each valve control device
The maximum normal-sub number of modules for dynamically being adjusted, and being put into operation in conjunction with corresponding bridge arm calculates final each group investment
The submodule number of operation, is handed down to each valve control device.
Step (4) described in a kind of above-mentioned flexible direct current converter valve submodule voltage control method is to sub- number of modules tune
Whole method particularly includes:
(41) if kmax-kmin< kN, then the submodule number for each valve control device investment for keeping the step (2) to calculate is not
Become；If kmax-kmin≥kN, then maximum deviation degree kmaxWith minimum irrelevance kminThe submodule number of corresponding valve control device investment
Mesh needs to be adjusted by step (42)；
(42) upper controller acquires bridge arm current IarmAnd judge direction, work as kmax-kmin≥kNWhen, if charging direction,
Then valve control device corresponding to maximum deviation degree investment submodule number byIt is reduced to 0, reduces the submodule of investment
In the submodule number for the investment that number increases to valve control device corresponding to minimum irrelevance, valve control corresponding to minimum irrelevance
The submodule number of the investment of device byBecomeIf bridge arm current IarmDirection is course of discharge, then minimum
Valve control device corresponding to irrelevance investment submodule number byIt is reduced to 0, the submodule number for reducing investment increases
Into the submodule number of the investment of valve control device corresponding to maximum deviation degree, the throwing of valve control device corresponding to big irrelevance
The submodule number entered byBecome
(43) if the valve control device according to corresponding to the maximum or minimum irrelevance that step (42) is calculated investment
The absolute value of submodule numberThe maximum normal-sub number of modules that can be put into greater than itIt is then maximum or
The maximum normal submodule that the submodule number of the investment of valve control device corresponding to person's minimum irrelevance can put into for it
It counts, the absolute value of the submodule number put into needed for remaining isIt is positive and negative withUnanimously,
The submodule number put into needed for remaining presses the weight of other valve control devices in addition to the present apparatusIt is assigned to
Other valve control devices；
(44) it in submodule number input by last calculated each valve control device, is only capable of generating point of positive voltage
Group, submodule number should meet relational expression:Positive pressure, which can be generated, also can generate the grouping of negative pressure, submodule
Number should meet relational expressionWhenWhen, show the submodule that the grouping valve control device needs to put into
Positive voltage is generated, whenWhen, show that the submodule that the grouping valve control device needs to put into generates no-voltage, when
When, show that the submodule that the grouping valve control device needs to put into generates negative voltage, the submodule number of all grouping investments is answered
Meet relational expression
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the sub-module types are identical or not
Together, sub-module types include half-bridge submodule shown in Fig. 2, full-bridge submodule shown in Fig. 3, class full-bridge submodule shown in Fig. 4
Block.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the principle of the grouping is a seed type
Submodule be individually divided into one group or be divided into multiple groups, but every group of submodule only allows the submodule unit there are single type.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the principle of the grouping are as follows: every group pair
The normal-sub number of modules answered is equal or unequal, allows every group of normal-sub number of modules dynamic change.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, different types of submodule puts into operation
When can generate positive and negative different voltage, for can generate negative pressure submodule be grouped, allow upper controller finally calculate
The submodule investment number of the grouping out is negative, and the submodule for that cannot generate negative pressure is grouped, if upper controller calculates
Its submodule number put into is negative, then needs to be adjusted the number that it puts into, the negative submodule number of investment becomes
0, negative number is by that can generate the valve control device of negative pressure by weightIt is allocated, wherein K is to be only capable of producing
The submodule of raw positive pressure is grouped number.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the normal submodule is that can participate in
The submodule of normal switching, does not include the submodule of bypass, blocking.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the upper controller control 1 or
The multiple bridge arm units of person.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, charging side described in the step (42)
To bridge arm current direction when referring to that submodule voltage rises, the course of discharge refers to the bridge arm electricity when decline of submodule voltage
Flow direction.
In a kind of above-mentioned flexible direct current converter valve submodule voltage control method, the submodule average voltage deviates
The setting value k of degreeN≤ 40%.
The present invention also provides a kind of flexible direct current converter valve submodule voltage-operated device, including submodule grouped element,
Submodule number puts into computing unit, weight calculation unit, irrelevance computing unit, submodule number and puts into adjustment unit, bridge
Arm current direction judging unit, submodule put into number issuance unit, wherein
The different types of submodule of each bridge arm of converter valve is divided into M group by the submodule grouped element, and M is nature
Number, M >=1, every group of institute's molecular modules number are For natural number,I be grouping serial number and 1≤i≤M, often
The corresponding valve control device of group, each valve control device independent operating issue submodule investment from upper controller to valve control device
Number；
The submodule number puts into unit, the total submodule number that should be put into for calculating corresponding bridge armWherein vrefFor real-time reference wave, UCNFor single submodule voltage rating；
The weight calculation unit calculates the weight B of administrative valve control device according to existing weighing computation methodiAnd root
The total submodule number that should be put into according to submodule number investment computing unit bridge arm calculatedCalculate each valve control device
The submodule number of investmentWherein round is round function；
The irrelevance computing unit calculates the submodule average voltage of administrative valve control deviceRelative to voltage rating
UCNIrrelevance ki,And calculate maximum deviation degree kmaxWith minimum irrelevance kminDifference whether be greater than valve control fill
Set the setting value k of set submodule average voltage irrelevanceN；
The bridge arm current walking direction unit is used to judge the direction of bridge arm current collected；
The submodule number puts into adjustment unit, puts into the calculated total son of computing unit according to submodule number
Module puts into number, and the weight and irrelevance computing unit of the calculated each valve control device of weight calculation unit calculate
Irrelevance weight calculation unit is calculated every in conjunction with bridge arm current direction judging unit calculated bridge arm current direction
The submodule number that a valve control device need to be put into is adjusted, and the normal submodule of maximum that can be put into operation in conjunction with corresponding bridge arm
Number generates final submodule investment number, is handed down to each valve control device by submodule investment number issuance unit.
The submodule puts into number issuance unit, and receiving submodule number puts into the final submodule that adjustment unit generates
Block investment number is handed down to each valve control device.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the submodule number investment adjustment is single
Member adjusts sub- number of modules method particularly includes:
(41) if kmax-kmin< kN, then the submodule number is kept to put into each valve control device of computing unit calculating in advance
The submodule invariable number of investment；If kmax-kmin≥kN, then maximum deviation degree kmaxWith minimum irrelevance kminCorresponding valve control
The submodule number of device investment needs to be adjusted by step (42)；
(42) upper controller acquires bridge arm current IarmAnd judge direction, work as kmax-kmin≥kNWhen, if charging direction,
Then the submodule number of the investment of valve control device corresponding to maximum deviation degree is reduced to 0, and the submodule number for reducing investment increases
Into the submodule number of the investment of valve control device corresponding to minimum irrelevance；If bridge arm current IarmDirection is course of discharge,
Then the submodule number of valve control device investment corresponding to minimum irrelevance is reduced to 0, and the submodule number for reducing investment increases
Into the submodule number of the investment of valve control device corresponding to maximum deviation degree；
(43) if the valve control device according to corresponding to the maximum or minimum irrelevance that step (42) is calculated investment
Submodule number is more than the maximum normal-sub number of modules that it can put into, then valve control corresponding to maximum or minimum irrelevance
The maximum normal-sub number of modules that the submodule number of device investment can put into for it, the submodule put into needed for remaining
Number is by the weight distribution of other valve control devices in addition to the present apparatus to other valve control devices；
(44) it in submodule number input by the calculated each valve control device of last upper controller, is only capable of generating just
The grouping of voltage, the calculated submodule number of upper controller should meet relational expression:Positive pressure can be generated
Also the grouping of negative pressure can be generated, the calculated submodule number of upper controller meets relational expressionWhenWhen, show that the grouping valve control device needs the submodule put into generate positive voltage, whenWhen, show the grouping
The submodule that valve control device needs to put into generates no-voltage, whenWhen, show the son that the grouping valve control device needs to put into
Module generates negative voltage, and the submodule number of all grouping investments should meet relational expression
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the sub-module types are identical or not
Together, sub-module types include half-bridge submodule as shown in Figure 2, full-bridge submodule shown in Fig. 3, class full-bridge shown in Fig. 4
Module.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the principle of the grouping is a seed type
Submodule be individually divided into one group or be divided into multiple groups, but every group of submodule only allows the submodule unit there are single type.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the principle of the grouping are as follows: every group pair
The normal-sub number of modules answered is equal or unequal, allows every group of normal-sub number of modules dynamic change.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, different types of submodule puts into operation
When can generate positive and negative different voltage, for can generate negative pressure submodule be grouped, allow upper controller finally calculate
The submodule investment number of the grouping out is negative, and the submodule for that cannot generate negative pressure is grouped, if upper controller calculates
Its submodule number put into is negative, then needs to be adjusted the number that it puts into, the negative submodule number of investment becomes
0, negative number is allocated by the valve control device that can generate negative pressure by weight.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the normal submodule is that can participate in
The submodule of normal switching, does not include the submodule of bypass, blocking.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the upper controller control 1 or
The multiple bridge arm units of person.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, charging side described in the step (42)
To bridge arm current direction when referring to that submodule voltage rises, the course of discharge refers to the bridge arm electricity when decline of submodule voltage
Flow direction.
In a kind of above-mentioned flexible direct current converter valve submodule voltage-operated device, the submodule average voltage deviates
The setting value k of degreeN≤ 40%.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (20)
1. a kind of flexible direct current converter valve submodule voltage control method, it is characterised in that: by the difference of each bridge arm of converter valve
The submodule of type is divided into M group, and M is natural number, M >=1, and every group of institute's molecular modules number isFor natural number,I is grouping serial number and 1≤i≤M, one valve control device of every group of correspondence, each valve control device independent operating, by upper layer
Controller issues the number that submodule is put into valve control device, and steps are as follows for the number calculating of submodule investment:
(1) upper controller calculates total submodule number that corresponding bridge arm should be put intoWherein vrefFor reality
When reference wave, UCNFor single submodule voltage rating；
(2) total submodule number that upper controller should be put into according to step (1) bridge arm calculatedAnd administrative valve control dress
The weight B seti, calculate the submodule number of each valve control device investmentWherein round is four houses five
Enter bracket function；
(3) upper controller calculates the submodule average voltage of administrative valve control deviceRelative to voltage rating UCNIrrelevance
ki,
(4) judge that upper controller calculates maximum deviation degree kmaxWith minimum irrelevance kminDifference whether be greater than valve control device set by
The setting value k for the submodule average voltage irrelevance setN, according to the submodule average voltage of valve control device relative to voltage rating
Irrelevance, valve control device weight BiAnd bridge arm current direction carries out the submodule number that each valve control device need to be put into
Dynamic adjustment, and the maximum normal-sub number of modules that can be put into operation in conjunction with corresponding bridge arm calculates final each group and puts into operation
Submodule number, be handed down to each valve control device.
2. a kind of flexible direct current converter valve submodule voltage control method as described in claim 1, it is characterised in that: the step
Suddenly (4) adjust sub- number of modules method particularly includes:
(41) if kmax-kmin< kN, then the submodule invariable number for each valve control device investment for keeping the step (2) to calculate；If
kmax-kmin≥kN, then maximum deviation degree kmaxWith minimum irrelevance kminThe submodule number of corresponding valve control device investment needs
It to be adjusted by step (42)；
(42) upper controller acquires bridge arm current IarmAnd judge direction, work as kmax-kmin≥kNWhen, if charging direction, then most
The submodule number of valve control device investment corresponding to big irrelevance is reduced to 0, and the submodule number for reducing investment increases to most
In the submodule number of the investment of valve control device corresponding to small irrelevance；If bridge arm current IarmDirection is course of discharge, then most
The submodule number of the investment of valve control device corresponding to small irrelevance is reduced to 0, and the submodule number for reducing investment increases to most
In the submodule number of the investment of valve control device corresponding to big irrelevance；
(43) if the submodule of the investment of the valve control device according to corresponding to the maximum or minimum irrelevance that step (42) is calculated
Block number is more than the maximum normal-sub number of modules that it can put into, then valve control device corresponding to maximum or minimum irrelevance
The maximum normal-sub number of modules that the submodule number of investment can put into for it, the submodule number put into needed for remaining
By the weight distribution of other valve control devices in addition to the present apparatus to other valve control devices；
(44) it in submodule number input by the calculated each valve control device of last upper controller, is only capable of generating positive voltage
Grouping, the calculated submodule number of upper controller should meet relational expression:Positive pressure can be generated also
The grouping of negative pressure is generated, the calculated submodule number of upper controller meets relational expressionWhen
When, show that the grouping valve control device needs the submodule put into generate positive voltage, whenWhen, show that the grouping valve control fills
It sets the submodule for needing to put into and generates no-voltage, whenWhen, show that the submodule that the grouping valve control device needs to put into produces
The submodule number of raw negative voltage, all grouping investments should meet relational expression
3. a kind of flexible direct current converter valve submodule voltage control method as described in claim 1, it is characterised in that: the son
Module type is same or different, and sub-module types include half-bridge submodule, full-bridge submodule, class full-bridge submodule.
4. a kind of flexible direct current converter valve submodule voltage control method as described in claim 1, it is characterised in that: described point
The principle of group is that a type of submodule is individually divided into one group or is divided into multiple groups, but every group of submodule only allows that there are single
The submodule unit of type.
5. a kind of flexible direct current converter valve submodule voltage control method as described in claim 1, it is characterised in that: described point
The principle of group are as follows: every group of corresponding normal-sub number of modules is equal or unequal, and every group of normal-sub number of modules dynamic is allowed to become
Change.
6. a kind of flexible direct current converter valve submodule voltage control method as described in claim 1, it is characterised in that: inhomogeneity
The submodule of type can generate positive and negative different voltage when putting into operation, the submodule for that can generate negative pressure is grouped, and allow
The submodule investment number of the final calculated grouping of upper controller is negative, for that cannot generate the submodule point of negative pressure
Group needs to be adjusted the number that it puts into if the submodule number that upper controller calculates its investment is negative, investment
Negative submodule number becomes 0, and negative number is allocated by the valve control device that can generate negative pressure by weight.
7. a kind of flexible direct current converter valve submodule voltage control method as described in claim 1, it is characterised in that: it is described just
Normal submodule is the submodule that can participate in normal switching, does not include the submodule of bypass, blocking.
8. a kind of flexible direct current converter valve submodule voltage control method as described in claim 1, it is characterised in that: on described
Layer controller controls 1 or multiple bridge arm units.
9. a kind of flexible direct current converter valve submodule voltage control method as claimed in claim 2, it is characterised in that: the step
Suddenly charging direction described in (42) refers to bridge arm current direction when submodule voltage rises, and the course of discharge refers to submodule
Bridge arm current direction when voltage declines.
10. a kind of flexible direct current converter valve submodule voltage control method as described in claim 1, it is characterised in that: described
Submodule average voltage irrelevance setting value kN≤ 40%.
11. a kind of flexible direct current converter valve submodule voltage-operated device, it is characterised in that: including submodule grouped element, son
Number of modules puts into computing unit, weight calculation unit, irrelevance computing unit, submodule number and puts into adjustment unit, bridge arm
Current direction judging unit, submodule put into number issuance unit, wherein
The different types of submodule of each bridge arm of converter valve is divided into M group by the submodule grouped element, and M is natural number, M
>=1, every group of institute's molecular modules number beFor natural number,I be grouping serial number and 1≤i≤M, every group pair
Ying Yitai valve control device, each valve control device independent operating issue the number that submodule is put into from upper controller to valve control device
Mesh；
The submodule number puts into unit, the total submodule number that should be put into for calculating corresponding bridge armWherein vrefFor real-time reference wave, UCNFor single submodule voltage rating；
The weight calculation unit calculates the weight B of administrative valve control device according to existing weighing computation methodi, and according to son
Total submodule number that number of modules investment computing unit bridge arm calculated should be put intoCalculate each valve control device investment
Submodule numberWherein round is round function；
The irrelevance computing unit calculates the submodule average voltage of administrative valve control deviceRelative to voltage rating UCN's
Irrelevance ki,And calculate maximum deviation degree kmaxWith minimum irrelevance kminDifference whether be greater than valve control device institute
The setting value k of the submodule average voltage irrelevance of settingN；
The bridge arm current walking direction unit is used to judge the direction of bridge arm current collected；
The submodule number puts into adjustment unit, puts into the calculated total submodule of computing unit according to submodule number
Number is put into, the weight and irrelevance computing unit of the calculated each valve control device of weight calculation unit are calculated partially
From degree, in conjunction with the calculated bridge arm current direction of bridge arm current direction judging unit, each valve calculated weight calculation unit
The maximum normal-sub number of modules that the submodule number that control device need to be put into is adjusted, and can put into operation in conjunction with corresponding bridge arm
Final submodule investment number is generated, each valve control device is handed down to by submodule investment number issuance unit；
The submodule puts into number issuance unit, and receiving submodule number puts into the final submodule that adjustment unit generates and throws
Enter number and is handed down to each valve control device.
12. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 11, it is characterised in that: described
Submodule number investment adjustment unit adjusts sub- number of modules method particularly includes:
(41) if kmax-kmin< kN, then the submodule number is kept to put into each valve control device investment of computing unit calculating in advance
Submodule invariable number；If kmax-kmin≥kN, then maximum deviation degree kmaxWith minimum irrelevance kminCorresponding valve control device is thrown
The submodule number entered needs to be adjusted by step (42)；
(42) upper controller acquires bridge arm current IarmAnd judge direction, work as kmax-kmin≥kNWhen, if charging direction, then most
The submodule number of valve control device investment corresponding to big irrelevance is reduced to 0, and the submodule number for reducing investment increases to most
In the submodule number of the investment of valve control device corresponding to small irrelevance；If bridge arm current IarmDirection is course of discharge, then most
The submodule number of the investment of valve control device corresponding to small irrelevance is reduced to 0, and the submodule number for reducing investment increases to most
In the submodule number of the investment of valve control device corresponding to big irrelevance；
(43) if the submodule of the investment of the valve control device according to corresponding to the maximum or minimum irrelevance that step (42) is calculated
Block number is more than the maximum normal-sub number of modules that it can put into, then valve control device corresponding to maximum or minimum irrelevance
The maximum normal-sub number of modules that the submodule number of investment can put into for it, the submodule number put into needed for remaining
By the weight distribution of other valve control devices in addition to the present apparatus to other valve control devices；
(44) it in submodule number input by the calculated each valve control device of last upper controller, is only capable of generating positive voltage
Grouping, the calculated submodule number of upper controller should meet relational expression:Positive pressure can be generated also
The grouping of negative pressure is generated, the calculated submodule number of upper controller meets relational expressionWhen
When, show that the grouping valve control device needs the submodule put into generate positive voltage, whenWhen, show that the grouping valve control fills
It sets the submodule for needing to put into and generates no-voltage, whenWhen, show that the submodule that the grouping valve control device needs to put into produces
The submodule number of raw negative voltage, all grouping investments should meet relational expression
13. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 11, it is characterised in that: described
Sub-module types are same or different, and sub-module types include half-bridge submodule, full-bridge submodule, class full-bridge submodule.
14. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 11, it is characterised in that: described
The principle of grouping is that a type of submodule is individually divided into one group or is divided into multiple groups, but every group of submodule only allows to have list
The submodule unit of one type.
15. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 11, it is characterised in that: described
The principle of grouping are as follows: every group of corresponding normal-sub number of modules is equal or unequal, allows every group of normal-sub number of modules dynamic
Variation.
16. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 11, it is characterised in that: different
The submodule of type can generate positive and negative different voltage when putting into operation, the submodule for that can generate negative pressure is grouped, and permit
Perhaps the submodule investment number of the final calculated grouping of upper controller is negative, for that cannot generate the submodule point of negative pressure
Group needs to be adjusted the number that it puts into if the submodule number that upper controller calculates its investment is negative, investment
Negative submodule number becomes 0, and negative number is allocated by the valve control device that can generate negative pressure by weight.
17. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 11, it is characterised in that: described
Normal submodule is the submodule that can participate in normal switching, does not include the submodule of bypass, blocking.
18. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 11, it is characterised in that: described
Upper controller controls 1 or multiple bridge arm units.
19. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 12, it is characterised in that: described
Charging direction described in step (42) refers to bridge arm current direction when submodule voltage rises, and the course of discharge refers to submodule
Bridge arm current direction when block voltage declines.
20. a kind of flexible direct current converter valve submodule voltage-operated device as claimed in claim 11, it is characterised in that: described
Submodule average voltage irrelevance setting value kN≤ 40%.
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