CN107910876A - A kind of outer shroud voltage control method and device based on chain type STATCOM - Google Patents
A kind of outer shroud voltage control method and device based on chain type STATCOM Download PDFInfo
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- CN107910876A CN107910876A CN201711183777.6A CN201711183777A CN107910876A CN 107910876 A CN107910876 A CN 107910876A CN 201711183777 A CN201711183777 A CN 201711183777A CN 107910876 A CN107910876 A CN 107910876A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The embodiment of the invention discloses a kind of outer shroud voltage control method and device based on chain type STATCOM, the integral operation link that the present invention passes through grading ring section in alternate grading ring section in the outer loop voltag PI control methods of removal and phase, the outer shroud for simplifying chain type STATCOM two close cycles complex controlls calculates controlling unit, solve and use proportional integration (PI) controller more since traditional outer voltage control, integral element is more, so that controller is to extraneous ride-through scarce capacity, easily there is capacitance voltage oscillatory occurences and system is unstable, grading ring section and alternate grading ring section particularly in phase, the transient response speed that result in existing three-phase chain type STATCOM systems is slow, the technical problem of Practical Project requirement is not met.
Description
Technical field
The present invention relates to field of power, more particularly to a kind of outer shroud voltage control method based on chain type STATCOM
And device.
Background technology
STATCOM, i.e. STATic synchronous COMpensator, static synchronous compensator, are that one kind is applied to
The power equipment that electric system carries out reactive-load compensation and comprehensive electric energy quality is administered.Chain type STATCOM refers to the main electricity of STATCOM
Road topological structure is connected in series or in parallel using single-phase full bridge circuit (2H bridges).
As the demand of quick dynamic passive compensation is growing, in mesohigh transmission ＆ distribution electrical domain, based on modularization string
The chain type STATCOM of parallel-connection structure with its direct screening voltage height, fast response time, the advantage such as compensation range is wide, transient characterisitics are excellent,
The fields such as wind power plant, Traditional DC transmission of electricity, factory integration power quality controlling are widely used.
The control system core algorithm of chain type STATCOM is the key for realizing expected compensation function.Traditional chain type STATCOM
Widely used voltage-to-current double-closed-loop control (voltage controls outer shroud and current control inner ring), outer voltage major control chain type
Each single-phase full bridge module DC capacitor voltage is constant in STATCOM, and current control inner ring main function is to realize d, q axis direct current
The rapid track and control of electric current；Outer voltage control is generally divided into three layers：In overall Pressure and Control, phase pressure and it is alternate press,
But proportional, integral (PI) controller is used since traditional outer voltage control, integral element is more so that controller is external
, easily there is capacitance voltage oscillatory occurences in boundary's ride-through scarce capacity and system is unstable, is pressed particularly in phase and alternate
Grading ring, it is slow to result in the transient response speed of existing three-phase chain type STATCOM systems, does not meet the skill of Practical Project requirement
Art problem.
The content of the invention
The present invention provides a kind of outer shroud voltage control method, device based on chain type STATCOM, for solving due to passing
The outer voltage control of system uses proportional, integral (PI) controller, and integral element is more so that controller supports external disturbance
, easily there is capacitance voltage oscillatory occurences and system is unstable in imperial scarce capacity, is particularly in phase pressure and alternate grading ring, leads
Cause the transient response speed of existing three-phase chain type STATCOM systems slow, do not meet the technical problem of Practical Project requirement.
The present invention provides a kind of outer shroud voltage control method based on chain type STATCOM, including：
S1：The DC capacitor voltage sampled value of each 2H bridges in chain type STATCOM systems is obtained by sampling；
S2：According to the DC capacitor voltage sampled value, the average value and three of single-phase DC capacitance voltage is calculated respectively
The overall average of phase DC capacitor voltage；
S3：According to preset DC capacitor voltage reference value and the difference of the overall average of the three-phase dc capacitance voltage,
By integration-ratio controlling unit, d axis trace command electric currents are obtained, and be input in inner ring current control link；
S4：According to the average value of the overall average of the three-phase dc capacitance voltage and the single-phase DC capacitance voltage
Difference, by the first ratio controlling unit, obtains voltage between phases modulation correction amount；
S5：The average value of single-phase DC capacitance voltage according to each phase and the DC capacitor voltage sampled value respectively
Difference, by the second ratio controlling unit, obtain voltage modulated correction amount in phase；
S6：The voltage between phases is modulated into voltage modulated correction amount in correction amount and the phase, with inner ring current regulator
The inner ring modulation output voltage of section output is overlapped and synthesizes modulating wave, and then the modulating wave is sampled, generates PWM
Adjustment signal.
Preferably, further included after step S3：
S301：The three-phase access voltage of STATCOM access points and the threephase load electric current of STATCOM load-sides are obtained, is led to
Cross phaselocked loop and obtain q axis trace command electric currents, and be input in the inner ring current control link；
S302：The three-phase output current of STATCOM outputs is obtained, Park Transformation side is passed through according to the three-phase output current
Formula obtains d shaft currents component and q shaft current components, and access voltage according to the three-phase obtains d axis electricity by Park Transformation mode
Press component and q shaft voltage components, and by the d shaft currents component, the q shaft currents component, the d shaft voltages component and described
Q shaft voltage components are input in the inner ring current control link；
S303：According to the d axis trace command electric current, the q axis trace command electric current, the d shaft currents component, described
Q shaft currents component, the d shaft voltages component and the q shaft voltages component, before differential-ratio in inner ring current control
Controlling unit is presented, obtains the inner ring modulation output voltage.
Preferably, the step S4 is specifically included：
According to the overall average of the three-phase dc capacitance voltage and the difference of the average value of the single-phase DC capacitance voltage
Value, by the first ratio controlling unit, obtains voltage between phases modulation correction amount, wherein, the voltage between phases modulation correction amount
Calculation formula is：
Wherein, Δ ucyRepresent the voltage between phases that y phases export after the adjusting of the first ratio controlling unit and modulate correction amount,
Y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge modules
DC capacitor voltage average value,Represent the overall average of the three-phase dc capacitance voltage, Kp1It is normal to represent the first proportional gain
Number, ω represent the corresponding angular frequency of the chain type STATCOM system intialization frequencies,Represent phase difference.
Preferably, the step S5 is specifically included：
The average value of single-phase DC capacitance voltage according to each phase and the DC capacitor voltage sampled value respectively
Difference, by the second ratio controlling unit, exports voltage modulated correction amount in the phase of each cascade 2H bridges, wherein, it is described
The calculation formula of voltage modulated correction amount is in phase：
Wherein, Δ uiy,jVoltage modulated in the phase that j-th in y phases cascade 2H bridge exports after pressing in phase is represented to repair
Positive quantity, y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge moulds
The DC capacitor voltage average value of block, udcy,jRepresent the voltage sample value of j-th of cascade 2H bridge in y phase 2H bridge modules, Kp2Generation
The second proportional gain constant of table, ω represent the corresponding angular frequency of the chain type STATCOM system intialization frequencies.
Preferably, the timeconstantτ of the overall average of the three-phase dc capacitance voltage is controlledz, control it is described single-phase straight
Galvanic electricity holds the timeconstantτ of average voltagejWith the timeconstantτ for controlling the DC capacitor voltage sampled valuenRelation be：
τz＜ τj＜ τn。
A kind of outer shroud voltage-operated device based on chain type STATCOM, it is characterised in that including：
Voltage sampling unit, for obtaining the DC capacitor voltage sampled value of each 2H bridges by sampling；
Average calculation unit, for according to the DC capacitor voltage sampled value, calculating single-phase DC capacitance electricity respectively
The average value of pressure and the overall average of three-phase dc capacitance voltage；
Overall pressure unit, for according to the total of preset DC capacitor voltage reference value and the three-phase dc capacitance voltage
The difference of average value, by integration-ratio controlling unit, obtains d axis trace command electric currents, and be input to inner ring current regulator
In section；
Alternate pressure unit, for the overall average according to the three-phase dc capacitance voltage and the single-phase DC capacitance
The difference of the average value of voltage, by the first ratio controlling unit, obtains voltage between phases modulation correction amount；
Pressure unit in phase, for the average value of single-phase DC capacitance voltage according to each phase and the direct current respectively
The difference of capacitance voltage sampled value, by the second ratio controlling unit, obtains voltage modulated correction amount in phase；
Pulse output unit, for the voltage between phases to be modulated voltage modulated correction amount in correction amount and the phase, with
Inner ring current control link output inner ring modulation output voltage be overlapped and synthesize modulating wave, then to the modulating wave into
Row sampling, generates PWM adjustment signals.
Preferably, further include：
Phase locked-loop unit, the three-phase that the three-phase for obtaining STATCOM access points accesses voltage and STATCOM load-sides are born
Electric current is carried, q axis trace command electric currents are obtained by phaselocked loop, and be input in the inner ring current control link；
Park Transformation unit, for obtaining the three-phase output current of STATCOM outputs, leads to according to the three-phase output current
Cross Park Transformation mode and obtain d shaft currents component and q shaft current components, accessing voltage according to the three-phase passes through Park Transformation side
Formula obtains d shaft voltages component and q shaft voltage components, and the d shaft currents component, the q shaft currents component, the d axis is electric
Pressure component and the q shaft voltages component are input in the inner ring current control link；
Inner ring control unit, for according to the d axis trace command electric current, the q axis trace command electric current, the d axis
Current component, the q shaft currents component, the d shaft voltages component and the q shaft voltages component, by inner ring current control
Differential-ratio feedforward control link, obtain inner ring modulation output voltage.
Preferably, the alternate pressure unit is specifically used for：
According to the overall average of the three-phase dc capacitance voltage and the difference of the average value of the single-phase DC capacitance voltage
Value, by the first ratio controlling unit, obtains voltage between phases modulation correction amount, wherein, the voltage between phases modulation correction amount
Calculation formula is：
Wherein, Δ ucyRepresent the voltage between phases that y phases export after the adjusting of the first ratio controlling unit and modulate correction amount,
Y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge modules
DC capacitor voltage average value,Represent the overall average of the three-phase dc capacitance voltage, Kp1It is normal to represent the first proportional gain
Number, ω represent the corresponding angular frequency of the chain type STATCOM system intialization frequencies,Represent phase difference.
Preferably, pressure unit is specifically used in the phase：
The average value of single-phase DC capacitance voltage according to each phase and the DC capacitor voltage sampled value respectively
Difference, by the second ratio controlling unit, exports voltage modulated correction amount in the phase of each cascade 2H bridges, wherein, it is described
The calculation formula of voltage modulated correction amount is in phase：
Wherein, Δ uiy,jVoltage modulated in the phase that j-th in y phases cascade 2H bridge exports after pressing in phase is represented to repair
Positive quantity, y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge moulds
The DC capacitor voltage average value of block, udcy,jRepresent the voltage sample value of j-th of cascade 2H bridge in y phase 2H bridge modules, Kp2Generation
The second proportional gain constant of table, ω represent the corresponding angular frequency of the chain type STATCOM system intialization frequencies.
Preferably, the timeconstantτ of the overall average of the three-phase dc capacitance voltage is controlledz, control it is described single-phase straight
Galvanic electricity holds the timeconstantτ of average voltagejWith the timeconstantτ for controlling the DC capacitor voltage sampled valuenRelation be：
τz＜ τj＜ τn。
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages：
A kind of outer shroud voltage control method based on chain type STATCOM provided by the invention, including：S1：Obtained by sampling
Take the DC capacitor voltage sampled value of each 2H bridges in chain type STATCOM systems；S2：Sampled according to the DC capacitor voltage
Value, calculates the average value of single-phase DC capacitance voltage and the overall average of three-phase dc capacitance voltage respectively；S3：According to preset
The difference of DC capacitor voltage reference value and the overall average of the three-phase dc capacitance voltage, passes through integration-ratio control ring
Section, obtains d axis trace command electric currents, and is input in inner ring current control link；S4：According to the three-phase dc capacitance voltage
Overall average and the single-phase DC capacitance voltage average value difference, by the first ratio controlling unit, obtain alternate
Voltage modulated correction amount；S5：The average value of single-phase DC capacitance voltage according to each phase and DC capacitor electricity respectively
The difference of sampled value is pressed, by the second ratio controlling unit, obtains voltage modulated correction amount in phase；S6：By the voltage between phases
Modulate voltage modulated correction amount in correction amount and the phase, with the inner ring of inner ring current control link output modulate output voltage into
Row is superimposed and synthesizes modulating wave, and then the modulating wave is sampled, and generates PWM adjustment signals.
The product that the present invention passes through grading ring section in alternate grading ring section in the outer loop voltag PI control methods of removal tradition and phase
Divide operation link, the outer shroud for simplifying chain type STATCOM two close cycles complex controlls calculates controlling unit, solves due to traditional
Outer voltage control uses proportional, integral (PI) controller, and integral element is more so that controller is to extraneous ride-through energy
, easily there is capacitance voltage oscillatory occurences and system is unstable in power deficiency, and grading ring and alternate grading ring particularly in phase, cause
The transient response speed of existing three-phase chain type STATCOM systems is slow, does not meet the technical problem of Practical Project requirement.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow chart of outer shroud voltage control method one embodiment based on chain type STATCOM；
Fig. 2 is a kind of flow chart of outer shroud voltage control method another embodiment based on chain type STATCOM；
Fig. 3 is a kind of primary device structure diagram of chain type STATCOM；
Fig. 4 is a kind of structure diagram of outer shroud voltage-operated device one embodiment based on chain type STATCOM.
Embodiment
An embodiment of the present invention provides a kind of outer shroud voltage control method based on chain type STATCOM, for due to tradition
Outer voltage control use proportional, integral (PI) controller, integral element is more so that controller is to extraneous ride-through
, easily there is capacitance voltage oscillatory occurences in scarce capacity and system is unstable, is particularly in phase pressure and alternate grading ring, causes
The transient response speed of existing three-phase chain type STATCOM systems is slow, does not meet the technical problem of Practical Project requirement.
Goal of the invention, feature, advantage to enable the present invention is more obvious and understandable, below in conjunction with the present invention
Attached drawing in embodiment, is clearly and completely described the technical solution in the embodiment of the present invention, it is clear that disclosed below
Embodiment be only part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this area
All other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Scope.
Referring to Fig. 1, the present invention provides a kind of one implementation of outer shroud voltage control method based on chain type STATCOM
Example, including：
101：The DC capacitor voltage sampled value of each 2H bridges in chain type STATCOM systems is obtained by sampling；
It should be noted that udcy,jFor the DC capacitor voltage sampled value of j-th of 2H bridge in y phases, wherein, y=A, B
Or C, A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules are represented respectively, and j represents j-th of 2H bridge module in y phases.
102：According to DC capacitor voltage sampled value, average value and the three-phase for calculating single-phase DC capacitance voltage respectively are straight
Flow the overall average of capacitance voltage；
It should be noted that the average value of single-phase DC capacitance voltageFor：
The overall average of three-phase dc capacitance voltageFor：
Wherein, n represents each uniphase mode 2H bridge modules quantity in the block.
103：According to preset DC capacitor voltage reference value and the difference of the overall average of three-phase dc capacitance voltage, pass through
Integration-ratio controlling unit, obtains d axis trace command electric currents, and is input in inner ring current control link；
It should be noted that by integration-ratio controlling unit, to the electricity of all 2H bridge modules in STATCOM systems
Hold magnitude of voltage to be regulated and controled so that the overall average of three-phase dc capacitance voltageThe preset DC capacitor voltage that levels off to refers to
Value udcref, and export d axis trace command electric currents idrefAs the command value of current inner loop d axis, wherein integration-ratio controlling unit
Algorithm be：
Wherein, idrefFor d axis trace command electric currents, udcrefFor preset DC capacitor voltage reference value, Kp0Integrate in order to control-
The proportional gain constant of ratio controlling unit, KiFor the storage gain constant of integration-ratio controlling unit.
104：According to the overall average of three-phase dc capacitance voltage and the difference of the average value of single-phase DC capacitance voltage, lead to
The first ratio controlling unit is crossed, obtains voltage between phases modulation correction amount；
It should be noted that pass through the first ratio controlling unit so that the average value of each single-phase DC capacitance voltageBecome
To in the overall average of three-phase dc capacitance voltageAnd export alternate voltage modulated correction amount ucy, wherein, the first ratio
The algorithm of controlling unit is：
Wherein, ucqThe voltage between phases modulation correction amount that representative exports after the adjusting of the first ratio controlling unit, y=(A,
One of B, C) represent in A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules,Represent single-phase 2H bridge modules
DC capacitor voltage average value,Represent the overall average of three-phase dc capacitance voltage, Kp1The first proportional gain constant is represented,
ω represents the corresponding angular frequency of chain type STATCOM system intialization frequencies,Represent phase difference；
Wherein, the voltage between phases modulation correction amount u of A phases is calculatedcAWhen,For 0 °；The voltage between phases modulation for calculating B phases is repaiied
Positive quantity Δ ucBWhen,For 120 °；Calculate the voltage between phases modulation correction amount u of C phasescCWhen,For 240 °.
105：Respectively according to the difference of the average value of single-phase DC capacitance voltage and DC capacitor voltage sampled value in each phase,
By the second ratio controlling unit, voltage modulated correction amount in phase is obtained；
It should be noted that pass through the second ratio controlling unit so that each DC capacitor voltage sampled value in the phase
udcy,jThe average value for the single-phase DC capacitance voltage being intended in single-phase where itAnd voltage modulated amendment in the output phase
Measure Δ uiy,j, wherein, the algorithm of the second ratio controlling unit is
Wherein, Δ uiy,jVoltage modulated correction amount in the phase exported after being pressed in phase is represented, y=(A, B, C) represents A phases
One of in 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules, j represents j-th of 2H bridge in single-phase 2H bridge modules,Represent the DC capacitor voltage average value of single-phase 2H bridge modules, udcy,jRepresent in single-phase 2H bridge modules and cascade 2H bridges j-th
Voltage, Kp2The second proportional gain constant is represented, ω represents the corresponding angular frequency of chain type STATCOM system intialization frequencies.
106：Voltage between phases is modulated into voltage modulated correction amount in correction amount and phase, with the output of inner ring current control link
Inner ring modulation output voltage is overlapped and synthesizes modulating wave, and then modulating wave is sampled, generates PWM adjustment signals.
Further, control the time of the overall average of the three-phase dc capacitance voltage in integration-ratio controlling unit normal
Number τz, control the first ratio controlling unit in single-phase DC capacitance voltage average value timeconstantτjWith control the second ratio
The timeconstantτ of DC capacitor voltage sampled value in controlling unitnRelation be：τz＜ τj＜ τn。
It should be noted that the ginseng of integration-ratio controlling unit, the first ratio controlling unit and the second ratio controlling unit
Number design is coordinated by the time constant of controlling unit, by the approximate of model framework chart and is simplified, three control rings
It is expressed as typical first order inertial loop, it is assumed that the time constant of three links is respectively τz、τjAnd τn, the present invention provide when
Between constant matching relationship be τz＜ τj＜ τn, to 50Hz systems in concrete engineering implementation, usually take τz=10ms, τj=20ms, τn
100 τ of ＞j。
An embodiment of the present invention provides a kind of outer shroud voltage control method one embodiment based on chain type STATCOM, sheet
Embodiment controls in outer shroud in phase integral element in pressure and alternate grading ring section by removing voltage, reduces needs and sets
The control parameter of meter, the cooperation for improving the resilience to external disturbance and passage time constant of controller carries out three layers
The coordination of Pressure and Control, simplifies the design of grading ring controller parameter, optimizes the process of system adjustment.
It is above a kind of the detailed of outer shroud voltage control method one embodiment based on chain type STATCOM provided by the invention
Thin narration, is described below a kind of outer shroud voltage control method another embodiment based on chain type STATCOM provided by the invention
Detailed narration.
Fig. 2 and Fig. 3 are referred to, the present invention provides a kind of outer shroud voltage control method based on chain type STATCOM is another
A embodiment, including：
201：The DC capacitor voltage sampled value of each 2H bridges in chain type STATCOM systems is obtained by sampling；
It should be noted that DC capacitor voltage sampled value is udcy,j, wherein, y=(A, B, C) represent A phase 2H bridge modules,
One of in B phase 2H bridge modules, C phase 2H bridge modules, j represents j-th of 2H bridge module in the phase.
202：According to DC capacitor voltage sampled value, average value and the three-phase for calculating single-phase DC capacitance voltage respectively are straight
Flow the overall average of capacitance voltage；
It should be noted that the average value of single-phase DC capacitance voltageFor：
The overall average of three-phase dc capacitance voltageFor：
Wherein, n represents each uniphase mode 2H bridge modules quantity in the block.
203：According to preset DC capacitor voltage reference value and the difference of the overall average of three-phase dc capacitance voltage, pass through
Integration-ratio controlling unit obtains d axis trace command electric currents, and is input in inner ring current control link；
It should be noted that by integration-ratio controlling unit, to the electricity of all 2H bridge modules in STATCOM systems
Hold magnitude of voltage to be regulated and controled so that the overall average of three-phase dc capacitance voltageThe preset DC capacitor voltage that levels off to refers to
Value udcref, and export d axis trace command electric currents idrefAs the command value of current inner loop d axis, wherein integration-ratio controlling unit
Algorithm be：
Wherein, idrefFor d axis trace command electric currents, udcrefFor preset DC capacitor voltage reference value, Kp0Integrate in order to control-
The proportional gain constant of ratio controlling unit, KiFor the storage gain constant of integration-ratio controlling unit.
204：The three-phase access voltage of STATCOM access points and the threephase load electric current of STATCOM load-sides are obtained, is passed through
Phaselocked loop obtains q axis trace command electric currents, and is input in inner ring current control link；
It should be noted that voltage u is accessed according to the three-phase of STATCOM access pointsSABCThe q axis got by phaselocked loop
Trace command electric current is iqref, the command value as current inner loop q axis.
205：The three-phase output current of STATCOM outputs is obtained, is obtained according to three-phase output current by Park Transformation mode
To d shaft currents component and q shaft current components, voltage is accessed according to three-phase d shaft voltages component and q are obtained by Park Transformation mode
Shaft voltage component, and d shaft currents component, q shaft currents component, d shaft voltages component and q shaft voltage components are input to interior circular current
In controlling unit；
It should be noted that three-phase output current iSABCD shaft current components i is obtained by Park Transformation modecdWith q axis electricity
Flow component icq；Three-phase access voltage uSABCD shaft voltage components u is obtained by Park Transformation modesqWith q shaft voltage components usq。
206：According to d axis trace commands electric current, q axis trace commands electric current, d shaft currents component, q shaft currents component, d axis electricity
Component and q shaft voltage components are pressed, by the differential in inner ring current control-ratio feedforward control link, it is defeated to obtain inner ring modulation
Go out voltage；
It should be noted that it is theoretical based on Passive Shape Control, establish Euler-Lagrange equation：
Wherein, x=[icd icq]TFor the state variable of system, icdAnd icqIt is by iSABCThe d axis electricity obtained through Park Transformation
Flow component and q shaft current components；It is grid-connected through connecting reactance L for positive definite inertial matrix, the output of reflection system；It is system interconnection matrix, the coupling between reflection d, q；It is the symmetrical damping battle array of positive definite, instead
The intrinsic property of energy dissipation of system is reflected；
U=[usd-ucd usq-ucq]TIt is external input matrix, uCABCAnd usqBy three-phase access voltage uSABCThrough Park Transformation
Obtain, ucdAnd ucqBy three-phase average voltage uCABCObtained through Park Transformation, wherein, three-phase access voltage uSABCFor by A, B, C tri-
The voltage vector that the access component of voltage of phase merges, three-phase average voltage uCABCFor by the average voltage of A, B, C three-phase point
Amount merges obtained voltage vector.
Current inner loop control mainly realizes d axis instruction currents iqrefWith q axis instruction currents iqrefQuick tracking, make x*=
[idref iqref]T, then tracking error xeIt can be expressed as：
xe=x-x*=[ied ieq]T
The error dynamics equation for further establishing system is as follows：
R is injected by designing automatic virtual blocksa=diag { ra1,ra2, and have ra1＞ 0, ra2＞ 0, realizes the quick of command value
Tracing control.By way of liapunov function derivation, the inner ring current Control Algorithm finally obtained is：
207：According to the overall average of three-phase dc capacitance voltage and the difference of single-phase DC capacitance voltage average value, pass through
First ratio controlling unit, obtains voltage between phases modulation correction amount；
It should be noted that pass through the first ratio controlling unit so that the average value of each single-phase DC capacitance voltageBecome
To in the overall average of three-phase dc capacitance voltageAnd export alternate voltage modulated correction amount ucy, wherein, the first ratio
The algorithm of controlling unit is：
Wherein, Δ ucyRepresent the voltage between phases that y phases export after the adjusting of the first ratio controlling unit and modulate correction amount,
Y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge modules
DC capacitor voltage average value,Represent the overall average of three-phase dc capacitance voltage, Kp1The first proportional gain constant is represented,
ω represents the corresponding angular frequency of chain type STATCOM system intialization frequencies,Represent phase difference；
Wherein, the voltage between phases modulation correction amount u of A phases is calculatedcAWhen,For 0 °；The voltage between phases modulation for calculating B phases is repaiied
Positive quantity Δ ucBWhen,For 120 °；Calculate the voltage between phases modulation correction amount u of C phasescCWhen,For 240 °.
208：Respectively according to the difference of the average value of single-phase DC capacitance voltage and DC capacitor voltage sampled value in each phase,
By the second ratio controlling unit, voltage modulated correction amount in phase is obtained；
It should be noted that pass through the second ratio controlling unit so that each DC capacitor voltage sampled value in y phases
udcy,jThe average value for the single-phase DC capacitance voltage being intended in single-phase where itAnd voltage modulated amendment in the output phase
Measure Δ uiy,j, wherein, the algorithm of the second ratio controlling unit is
Wherein, Δ uiy,jVoltage modulated in the phase that j-th in y phases cascade 2H bridge exports after pressing in phase is represented to repair
Positive quantity, y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge moulds
The DC capacitor voltage average value of block, udcy,jRepresent the voltage sample value of j-th of cascade 2H bridge in y phase 2H bridge modules, Kp2Generation
The second proportional gain constant of table, ω represent the corresponding angular frequency of chain type STATCOM system intialization frequencies.
209：Voltage between phases is modulated into voltage modulated correction amount in correction amount and phase, with the output of inner ring current control link
Inner ring modulation output voltage is overlapped and synthesizes modulating wave, and then modulating wave is sampled, generates PWM adjustment signals.
It should be noted that according to the PWM adjustment signals ultimately generated, regulate and control each in chain type STATCOM systems
IGBT module, adjusts the voltage compensation efficiency to power transmission and transforming equipment.
Further, the timeconstantτ of the overall average of three-phase dc capacitance voltage is controlledz, control single-phase DC electricity
Hold the timeconstantτ of average voltagejWith the timeconstantτ of control DC capacitor voltage sampled valuenRelation be：τz＜ τj＜
τn。
It should be noted that the ginseng of integration-ratio controlling unit, the first ratio controlling unit and the second ratio controlling unit
Number design is coordinated by the time constant of controlling unit, by the approximate of model framework chart and is simplified, three control rings
It is expressed as typical first order inertial loop, integration-ratio controlling unit, the first ratio controlling unit and the second ratio controlling unit
Time constant be respectively τz、τjAnd τn, wherein each time constant matching relationship is τz＜ τj＜ τn, it is right in concrete engineering implementation
50Hz systems, usually take τz=10ms, τj=20ms, τn100 τ of ＞j。
An embodiment of the present invention provides a kind of outer shroud voltage control method another embodiment based on chain type STATCOM,
The outer shroud voltage control loop section that the present embodiment is pressed with the integral element in alternate grading ring section according to removing in phase, with use
The inner ring current control link of Passive Shape Control strategy based on energy dissipation cooperates, and ensure that the stabilization of control system
Property, while command value feedforward is introduced in interior circular current controlling unit, wherein, there was only two virtual injections in interior ring controller
Damping parameter needs to design, and greatly simplifies controller design and field adjustable process, improves the transient response of STATCOM
Speed.
It is above a kind of outer shroud voltage control method another reality based on chain type STATCOM provided in an embodiment of the present invention
The detailed narration of example is applied, is below a kind of outer shroud voltage-operated device based on chain type STATCOM provided in an embodiment of the present invention
The detailed description of one embodiment.
An a kind of referring to Fig. 4, implementation the present invention provides outer shroud voltage-operated device based on chain type STATCOM
Example, including：
Voltage sampling unit 401, for obtaining the DC capacitor voltage sampled value of each 2H bridges by sampling；
Average calculation unit 402, for according to DC capacitor voltage sampled value, calculating single-phase DC capacitance voltage respectively
Average value and three-phase dc capacitance voltage overall average；
Overall pressure unit 403, for according to the total of preset DC capacitor voltage reference value and three-phase dc capacitance voltage
The difference of average value, by integration-ratio controlling unit, obtains d axis trace command electric currents, and be input to inner ring current regulator
In section；
Alternate pressure unit 404, for the overall average according to three-phase dc capacitance voltage and single-phase DC capacitance voltage
Average value difference, by the first ratio controlling unit, obtain voltage between phases modulation correction amount；
Pressure unit 405 in phase, for respectively according to the average value and DC capacitor of single-phase DC capacitance voltage in each phase
The difference of voltage sample value, by the second ratio controlling unit, obtains voltage modulated correction amount in phase；
Pulse output unit 406, for voltage between phases to be modulated voltage modulated correction amount in correction amount and phase, with inner ring electricity
The inner ring modulation output voltage of flow control link output is overlapped and synthesizes modulating wave, and then modulating wave is sampled, raw
Into PWM adjustment signals.
Further, further include：
Phase locked-loop unit 407, the three-phase for obtaining STATCOM access points access the three of voltage and STATCOM load-sides
Phase load electric current, q axis trace command electric currents are obtained by phaselocked loop, and are input in inner ring current control link；
Park Transformation unit 408, for obtaining the three-phase output current of STATCOM outputs, leads to according to three-phase output current
Cross Park Transformation mode and obtain d shaft currents component and q shaft current components, access voltage according to three-phase is obtained by Park Transformation mode
Divide to d shaft voltages component and q shaft voltage components, and by d shaft currents component, q shaft currents component, d shaft voltages component and q shaft voltages
Amount is input in inner ring current control link；
Inner ring control unit 409, for according to d axis trace commands electric current, q axis trace commands electric current, d shaft currents component, q
Shaft current component, d shaft voltages component and q shaft voltage components, pass through the differential in inner ring current control-ratio feedforward control ring
Section, obtains inner ring modulation output voltage.
Further, alternate pressure unit is specifically used for：
According to the overall average of three-phase dc capacitance voltage and the difference of the average value of single-phase DC capacitance voltage, pass through
One ratio controlling unit, obtains voltage between phases modulation correction amount, wherein, the calculation formula of voltage between phases modulation correction amount is：
Wherein, Δ ucyRepresent the voltage between phases that y phases export after the adjusting of the first ratio controlling unit and modulate correction amount,
Y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge modules
DC capacitor voltage average value,Represent the overall average of three-phase dc capacitance voltage, Kp1The first proportional gain constant is represented,
ω represents the corresponding angular frequency of chain type STATCOM system intialization frequencies,Represent phase difference.
Further, pressure unit is specifically used in phase：
Respectively according to the difference of the average value of single-phase DC capacitance voltage and DC capacitor voltage sampled value in each phase, pass through
Second ratio controlling unit, exports voltage modulated correction amount in the phase of each cascade 2H bridges, wherein, voltage modulated correction amount in phase
Calculation formula be：
Wherein, Δ uiy,jVoltage modulated in the phase that j-th in y phases cascade 2H bridge exports after pressing in phase is represented to repair
Positive quantity, y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge moulds
The DC capacitor voltage average value of block, udcy,jRepresent the voltage sample value of j-th of cascade 2H bridge in y phase 2H bridge modules, Kp2Generation
The second proportional gain constant of table, ω represent the corresponding angular frequency of chain type STATCOM system intialization frequencies.
Further, the timeconstantτ of the overall average of three-phase dc capacitance voltage is controlledz, control single-phase DC capacitance
The timeconstantτ of average voltagejWith the timeconstantτ of control DC capacitor voltage sampled valuenRelation be：τz＜ τj＜ τn。
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with
Realize by another way.For example, device embodiment described above is only schematical, for example, the unit
Division, is only a kind of division of logic function, can there is other dividing mode, such as multiple units or component when actually realizing
Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
Close or communicate to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
In network unit.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and is used as independent production marketing or use
When, it can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part to contribute in other words to the prior art or all or part of the technical solution can be in the form of software products
Embody, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server, or network equipment etc.) performs the complete of each embodiment the method for the present invention
Portion or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
State the technical solution described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical solution.
Claims (10)
- A kind of 1. outer shroud voltage control method based on chain type STATCOM, it is characterised in that including：S1：The DC capacitor voltage sampled value of each 2H bridges in chain type STATCOM systems is obtained by sampling；S2：According to the DC capacitor voltage sampled value, average value and the three-phase for calculating single-phase DC capacitance voltage respectively are straight Flow the overall average of capacitance voltage；S3：According to preset DC capacitor voltage reference value and the difference of the overall average of the three-phase dc capacitance voltage, pass through Integration-ratio controlling unit, obtains d axis trace command electric currents, and is input in inner ring current control link；S4：According to the overall average of the three-phase dc capacitance voltage and the difference of the average value of the single-phase DC capacitance voltage Value, by the first ratio controlling unit, obtains voltage between phases modulation correction amount；S5：The difference of the average value of single-phase DC capacitance voltage according to each phase and the DC capacitor voltage sampled value respectively Value, by the second ratio controlling unit, obtains voltage modulated correction amount in phase；S6：The voltage between phases is modulated into voltage modulated correction amount in correction amount and the phase, it is defeated with inner ring current control link The inner ring modulation output voltage gone out is overlapped and synthesizes modulating wave, and then the modulating wave is sampled, generation PWM regulation and control Signal.
- A kind of 2. outer shroud voltage control method based on chain type STATCOM according to claim 1, it is characterised in that step Further included after rapid S3：S301：The three-phase access voltage of STATCOM access points and the threephase load electric current of STATCOM load-sides are obtained, passes through lock Phase ring obtains q axis trace command electric currents, and is input in the inner ring current control link；S302：The three-phase output current of STATCOM outputs is obtained, is obtained according to the three-phase output current by Park Transformation mode To d shaft currents component and q shaft current components, voltage is accessed according to the three-phase d shaft voltages point are obtained by Park Transformation mode Amount and q shaft voltage components, and by the d shaft currents component, the q shaft currents component, the d shaft voltages component and the q axis Component of voltage is input in the inner ring current control link；S303：According to the d axis trace command electric current, the q axis trace command electric current, the d shaft currents component, the q axis Current component, the d shaft voltages component and the q shaft voltages component, pass through the differential in inner ring current control-ratio feedforward control Link processed, obtains the inner ring modulation output voltage.
- A kind of 3. outer shroud voltage control method based on chain type STATCOM according to claim 1, it is characterised in that institute Step S4 is stated to specifically include：According to the overall average of the three-phase dc capacitance voltage and the difference of the average value of the single-phase DC capacitance voltage, lead to The first ratio controlling unit is crossed, obtains voltage between phases modulation correction amount, wherein, the calculating of the voltage between phases modulation correction amount is public Formula is：Wherein, Δ ucyRepresent the voltage between phases that y phases export after the adjusting of the first ratio controlling unit and modulate correction amount, y= A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent the direct current of y phase 2H bridge modules Capacitance voltage average value,Represent the overall average of the three-phase dc capacitance voltage, Kp1The first proportional gain constant is represented, ω represents the corresponding angular frequency of the chain type STATCOM system intialization frequencies,Represent phase difference.
- A kind of 4. outer shroud voltage control method based on chain type STATCOM according to claim 1, it is characterised in that institute Step S5 is stated to specifically include：The difference of the average value of single-phase DC capacitance voltage according to each phase and the DC capacitor voltage sampled value respectively, By the second ratio controlling unit, voltage modulated correction amount in the phase of each cascade 2H bridges is exported, wherein, it is electric in the phase Pressure modulation correction amount calculation formula be：<mrow> <msub> <mi>&Delta;u</mi> <mrow> <mi>i</mi> <mi>y</mi> <mo>,</mo> <mi>j</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>K</mi> <mrow> <mi>p</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mover> <mi>u</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>d</mi> <mi>c</mi> <mi>y</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>u</mi> <mrow> <mi>d</mi> <mi>c</mi> <mi>y</mi> <mo>,</mo> <mi>j</mi> </mrow> </msub> <mo>)</mo> </mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&omega;</mi> <mi>t</mi> <mo>;</mo> </mrow>Wherein, Δ uiy,jVoltage modulated correction amount in the phase that j-th in y phases cascade 2H bridge exports after being pressed in phase is represented, Y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge modules DC capacitor voltage average value, udcy,jRepresent the voltage sample value of j-th of cascade 2H bridge in y phase 2H bridge modules, Kp2Represent Two proportional gain constants, ω represent the corresponding angular frequency of the chain type STATCOM system intialization frequencies.
- A kind of 5. outer shroud voltage control method based on chain type STATCOM according to claim 1, it is characterised in that control Make the timeconstantτ of the overall average of the three-phase dc capacitance voltagez, the control single-phase DC capacitance voltage average value TimeconstantτjWith the timeconstantτ of the DC capacitor voltage sampled value of controlnRelation be：τz＜ τj＜ τn。
- A kind of 6. outer shroud voltage-operated device based on chain type STATCOM, it is characterised in that including：Voltage sampling unit, for obtaining the DC capacitor voltage sampled value of each 2H bridges by sampling；Average calculation unit, for according to the DC capacitor voltage sampled value, calculating single-phase DC capacitance voltage respectively The overall average of average value and three-phase dc capacitance voltage；Overall pressure unit, for the overall average according to preset DC capacitor voltage reference value and the three-phase dc capacitance voltage The difference of value, by integration-ratio controlling unit, obtains d axis trace command electric currents, and be input to inner ring current control link In；Alternate pressure unit, for the overall average according to the three-phase dc capacitance voltage and the single-phase DC capacitance voltage Average value difference, by the first ratio controlling unit, obtain voltage between phases modulation correction amount；Pressure unit in phase, for the average value of single-phase DC capacitance voltage according to each phase and the DC capacitor respectively The difference of voltage sample value, by the second ratio controlling unit, obtains voltage modulated correction amount in phase；Pulse output unit, for the voltage between phases to be modulated voltage modulated correction amount in correction amount and the phase, with inner ring The inner ring modulation output voltage of current control link output is overlapped and synthesizes modulating wave, and then the modulating wave is adopted Sample, generates PWM adjustment signals.
- 7. a kind of outer shroud voltage-operated device based on chain type STATCOM according to claim 6, it is characterised in that also Including：Phase locked-loop unit, the three-phase for obtaining STATCOM access points access voltage and the threephase load electricity of STATCOM load-sides Stream, q axis trace command electric currents are obtained by phaselocked loop, and are input in the inner ring current control link；Park Transformation unit, for obtaining the three-phase output current of STATCOM outputs, passes through according to the three-phase output current and sends Gram mapping mode obtains d shaft currents component and q shaft current components, and access voltage according to the three-phase is obtained by Park Transformation mode Divide to d shaft voltages component and q shaft voltage components, and by the d shaft currents component, the q shaft currents component, the d shaft voltages Amount and the q shaft voltages component are input in the inner ring current control link；Inner ring control unit, for according to the d axis trace command electric current, the q axis trace command electric current, the d shaft currents Component, the q shaft currents component, the d shaft voltages component and the q shaft voltages component, by micro- in inner ring current control Point-ratio feedforward control link, obtain the inner ring modulation output voltage.
- A kind of 8. outer shroud voltage-operated device based on chain type STATCOM according to claim 6, it is characterised in that institute Alternate pressure unit is stated to be specifically used for：According to the overall average of the three-phase dc capacitance voltage and the difference of the average value of the single-phase DC capacitance voltage, lead to The first ratio controlling unit is crossed, obtains voltage between phases modulation correction amount, wherein, the voltage between phases modulation correction amount is：Wherein, Δ ucyRepresent the voltage between phases that y phases export after the adjusting of the first ratio controlling unit and modulate correction amount, y= A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent the direct current of y phase 2H bridge modules Capacitance voltage average value,Represent the overall average of the three-phase dc capacitance voltage, Kp1The first proportional gain constant is represented, ω represents the corresponding angular frequency of the chain type STATCOM system intialization frequencies,Represent phase difference.
- A kind of 9. outer shroud voltage-operated device based on chain type STATCOM according to claim 6, it is characterised in that institute Pressure unit in phase is stated to be specifically used for：The difference of the average value of single-phase DC capacitance voltage according to each phase and the DC capacitor voltage sampled value respectively, By the second ratio controlling unit, voltage modulated correction amount in the phase of each cascade 2H bridges is exported, wherein, it is electric in the phase Pressure modulates correction amount：<mrow> <msub> <mi>&Delta;u</mi> <mrow> <mi>i</mi> <mi>y</mi> <mo>,</mo> <mi>j</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>K</mi> <mrow> <mi>p</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mover> <mi>u</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>d</mi> <mi>c</mi> <mi>y</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>u</mi> <mrow> <mi>d</mi> <mi>c</mi> <mi>y</mi> <mo>,</mo> <mi>j</mi> </mrow> </msub> <mo>)</mo> </mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&omega;</mi> <mi>t</mi> <mo>;</mo> </mrow>Wherein, Δ uiy,jVoltage modulated correction amount in the phase that j-th in y phases cascade 2H bridge exports after being pressed in phase is represented, Y=A, B or C, represent A phase 2H bridge modules, B phase 2H bridge modules, C phase 2H bridge modules respectively,Represent y phase 2H bridge modules DC capacitor voltage average value, udcy,jRepresent the voltage sample value of j-th of cascade 2H bridge in y phase 2H bridge modules, Kp2Represent Two proportional gain constants, ω represent the corresponding angular frequency of the chain type STATCOM system intialization frequencies.
- A kind of 10. outer shroud voltage-operated device based on chain type STATCOM according to claim 6, it is characterised in that control Make the timeconstantτ of the overall average of the three-phase dc capacitance voltagez, the control single-phase DC capacitance voltage average value TimeconstantτjWith the timeconstantτ for controlling the DC capacitor voltage sampled valuenRelation be：τz＜ τj＜ τn。
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