CN102694385A - Phase current balancing and amplitude-limiting method for asymmetrical compensation of line current of distribution static compensator (D-STATCOM) - Google Patents

Phase current balancing and amplitude-limiting method for asymmetrical compensation of line current of distribution static compensator (D-STATCOM) Download PDF

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CN102694385A
CN102694385A CN2012101722557A CN201210172255A CN102694385A CN 102694385 A CN102694385 A CN 102694385A CN 2012101722557 A CN2012101722557 A CN 2012101722557A CN 201210172255 A CN201210172255 A CN 201210172255A CN 102694385 A CN102694385 A CN 102694385A
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phase current
phase
statcom
current
compensation
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杨振宇
陆建新
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CHANGZHOU KENENG ELECTRICAL APPLIANCES CO LTD
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CHANGZHOU KENENG ELECTRICAL APPLIANCES CO LTD
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Abstract

The invention relates to a phase current balancing and amplitude-limiting method for the asymmetrical compensation of a line current of a distribution static compensator (D-STATCOM). The method comprises the following steps of: calculating a group of phase current vectors; balancing the absolute value of a three-phase current instantaneous value in the group of phase current vectors as possible when the group of phase current vectors is in accordance with the conditions that the phase current of the D-STATCOM does not exceed a compensation limit, and the phase current and the line current are in accordance with the Kirchhoff current law; performing amplitude-limiting processing on the group of phase current vectors to obtain a vector; after obtaining a deviation value between the obtained vector and the compensation phase current vector actually output by the D-STATCOM, adjusting the deviation value by using a proportional-integral (PI) adjustor and outputting a modulation wave signal; processing the modulation wave signal by adopting a carrier phase-shifting pulse width modulation algorithm to generate a corresponding multi-level pulse-width modulation (PWM) pulse; and controlling a cascaded converter in the D-STATCOM to obtain a corresponding balanced and amplitude-limited phase current.

Description

The phase current balance amplitude limiting method of D-STATCOM line current asymmetry compensation
Technical field
The present invention relates to the technical field of three-phase fully-controlled rectification, specifically a kind of D-STATCOM(Power distribution network static reacance synchronizing generator)Line current asymmetry compensation phase current balance amplitude limiting method.
Background technology
The cascade connection type D-STATCOM of three-phase triangle connection grid connected structure includes CPU element, main part and simultaneously mesh portions;Main part is made up of cascade converter and connection reactance, and mesh portions include power network and load.The each phase of cascade converter hasnIndividual power cell, i.e. a1~an, b1~bn, c1~cn, with phasenAgain each with being connected reactance series winding, i.e. a1~a after individual power unit cascadenWith
Figure 2012101722557100002DEST_PATH_IMAGE002
, b1~bnWith
Figure 2012101722557100002DEST_PATH_IMAGE004
, c1~cnWith
Figure 2012101722557100002DEST_PATH_IMAGE006
Series connection;AndBe connected with c1,Be connected with a1,
Figure 63802DEST_PATH_IMAGE006
It is connected with b1, forms three-phase triangle head and the tail and connect.The three-phase of the D-STATCOM is provided with measurement phase currentThe first current transformer group, grid-connected place sets measurement line current
Figure 2012101722557100002DEST_PATH_IMAGE010
The second current transformer group, load-side provided with measurement load current
Figure 2012101722557100002DEST_PATH_IMAGE012
The 3rd current transformer group, grid side be provided with measuring system electric current
Figure 2012101722557100002DEST_PATH_IMAGE014
The 4th current transformer group, and measurement power network a phase voltage
Figure 2012101722557100002DEST_PATH_IMAGE016
Voltage transformer.
D-STATCOM is so that grid side electric current to the purpose that out-of-balance load is compensated
Figure 396694DEST_PATH_IMAGE014
Three-phase symmetrical, and power factor is 1.The three-phase compensation line current of now device output
Figure 211067DEST_PATH_IMAGE010
The absolute value of three-phase component may differ by very big, the three-phase phase current of corresponding device outputMay also it differ greatly, and a certain phase or a few phase components can exceed that the phase current limit of compensation of device, and to ensure equipment safety operation and can make full use of its compensation capacity, it exports three-phase phase current
Figure 113612DEST_PATH_IMAGE008
Need to carry out optimizing balance amplitude limiting control.
A kind of balance method of D-STATCOM asymmetry compensations electric current is disclosed in Chinese invention patent specification CN102222925.A, but the phase current limit of compensation of device can still be can exceed that by passing through optimization balanced algorithm acquisition three-phase phase current, how amplitude limiting processing is carried out to phase current, and three-phase phase current and line current still need to meet the constraint of Kirchhoff's current law (KCL), i.e.,
Figure 2012101722557100002DEST_PATH_IMAGE018
Formula (7)
To make full use of the compensation capacity of device and ensure that equipment safety is run, wherein,
Figure 2012101722557100002DEST_PATH_IMAGE020
The constraint matrix of phase voltage vector and line voltage vector after amplitude limiting processing,
Figure 182019DEST_PATH_IMAGE020
Value is relevant with specific slicing algorithm;
Figure 2012101722557100002DEST_PATH_IMAGE022
Figure 2012101722557100002DEST_PATH_IMAGE024
Figure 2012101722557100002DEST_PATH_IMAGE028
A, b, c three-phase line current and line current vector respectively after amplitude limiting processing.How to solve the balance amplitude limiting process problem of phase current, be D-STATCOM line current asymmetry compensation in technical barrier.
In addition, CPS-SPWM Technical References《Concrete methods of realizing of the CPS-SPWM technologies on cascade h-bridge converter》(《Power technology application》, 2 months 2006, the 2nd phase of volume 9), and《Carrier phase-shifted PWM Cascade H type current transformer and its application in Active Power Filter-APF》(《Proceedings of the CSEE》, in May, 2006, the 10th phase of volume 26).
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of when the cascade connection type D-STATCOM that three-phase triangle is connected carries out line current asymmetry compensation, a kind of optimal balance amplitude limit method is provided for the three-phase phase current of the D-STATCOM, to make full use of the compensation capacity of the device and ensure that equipment safety is run.
In order to solve the above technical problems, the technical scheme that the present invention is provided is as follows:
A kind of phase current balance amplitude limiting method of the line current asymmetry compensation of D-STATCOM, comprises the following steps:
Step one:Ask for the balance phase current corresponding to one group of line current;
Respectively with vector
Figure 2012101722557100002DEST_PATH_IMAGE030
With
Figure 2012101722557100002DEST_PATH_IMAGE032
Represent D-STATCOM one group of line current
Figure 788581DEST_PATH_IMAGE010
With corresponding balance phase current
Figure 2012101722557100002DEST_PATH_IMAGE034
, then
Figure 594994DEST_PATH_IMAGE032
It is represented by:
Formula (1)
Wherein,
Figure 2012101722557100002DEST_PATH_IMAGE038
,,
Figure 2012101722557100002DEST_PATH_IMAGE042
,
Figure 2012101722557100002DEST_PATH_IMAGE044
The maximum of the absolute value of triple line current instantaneous value is taken, i.e.,
Figure 2012101722557100002DEST_PATH_IMAGE046
Formula (2)
Step 2:To balance phase current obtained by step one
Figure 287006DEST_PATH_IMAGE032
Carry out amplitude limiting processing;
Ask for amplitude limit scale factorkkIt is represented by
Figure 2012101722557100002DEST_PATH_IMAGE048
Formula (3)
Wherein,
Figure 2012101722557100002DEST_PATH_IMAGE050
For D-STATCOM phase current limit of compensation,
Figure 2012101722557100002DEST_PATH_IMAGE052
The maximum of the absolute value of a certain group of balance phase current instantaneous value is taken, i.e.,
Formula (4)
Ask for the vector of the balance phase current after amplitude limiting processing
Figure 2012101722557100002DEST_PATH_IMAGE056
Figure 712434DEST_PATH_IMAGE056
It is represented by
Figure 2012101722557100002DEST_PATH_IMAGE058
Formula (5)
Step 3:The generation of pwm pulse is controlled with device;
Obtain vector obtained by step 2
Figure 2012101722557100002DEST_PATH_IMAGE060
With the compensation phase current vector of D-STATCOM reality outputs
Figure 2012101722557100002DEST_PATH_IMAGE062
Deviation
Figure 2012101722557100002DEST_PATH_IMAGE064
Afterwards, by the deviation
Figure 111185DEST_PATH_IMAGE064
Modulation wave signal is exported after being adjusted through proportion integral control device
Figure 2012101722557100002DEST_PATH_IMAGE066
, then to the modulation wave signal
Figure 603346DEST_PATH_IMAGE066
Handled using phase-shifting carrier wave pulse width modulation algorithm and produce corresponding many level PWM pulses, many level PWM pulses are controlled to the cascade converter in D-STATCOM, to produce corresponding balance amplitude limiting phase current.
In a kind of phase current balance amplitude limiting method of D-STATCOM line current asymmetry compensation of the present invention, phase current is carried out after amplitude limiting processing, three-phase phase current and line current should meet the constraint of Kirchhoff's current law (KCL), the constraints of equation (7) should be met, in this, it was demonstrated that as follows:
First, it was demonstrated that
Figure 844972DEST_PATH_IMAGE060
Meet the constraints in equation (7)
Figure 2012101722557100002DEST_PATH_IMAGE068
Equation (1) is substituted into equation (5), obtained
        
Figure 2012101722557100002DEST_PATH_IMAGE070
Formula (25)
From equation (3), matrix B full rank(
Figure 2012101722557100002DEST_PATH_IMAGE072
), then equation (25) can transform to
Figure 2012101722557100002DEST_PATH_IMAGE074
Formula (26)
I.e. in equation (7),
Figure 826089DEST_PATH_IMAGE020
Take
Figure 2012101722557100002DEST_PATH_IMAGE076
,
Figure 2012101722557100002DEST_PATH_IMAGE078
With
Figure 531877DEST_PATH_IMAGE056
Between still conform to shown in Fig. 1 Kirchhoff's current law (KCL) constraint.
Secondly, it was demonstrated that constraints in equation (7)
Figure DEST_PATH_IMAGE080
Without loss of generality, it can make
Figure DEST_PATH_IMAGE082
, i.e.,
Figure DEST_PATH_IMAGE084
,.From equation (3), if
Figure DEST_PATH_IMAGE088
, then
Figure DEST_PATH_IMAGE090
,,
Figure DEST_PATH_IMAGE096
If
Figure DEST_PATH_IMAGE098
,
Figure DEST_PATH_IMAGE100
,
Figure DEST_PATH_IMAGE104
,
Finally, it was demonstrated that the constraints in equation (7)
Figure DEST_PATH_IMAGE108
From equation (25),
Figure DEST_PATH_IMAGE110
, then
Figure DEST_PATH_IMAGE112
To sum up, phase current is carried out after amplitude limiting processing, three-phase phase current and line current are still met
Figure 181557DEST_PATH_IMAGE018
Formula (7)
Constraints, i.e., still meet the constraint of Kirchhoff's current law (KCL).
A kind of phase current balance amplitude limiting method of D-STATCOM line current asymmetry compensation of the present invention, solve D-STATCOM to asymmetrical three-phase load compensate when, compensation device three-phase phase current be likely to occur deviation it is larger and very likely exceed device limit of compensation the problem of.The D-STATCOM reactive power compensators of the present invention are when using the connection of three-phase triangle, one group of three-phase line current can have infinite multigroup corresponding feature of three-phase phase current, using optimization balanced algorithm, one group of optimization balance three-phase phase current can be obtained, its maximum is the minimum value in the combination that is made up of the maximum in all phase current groups for meeting equation (6).Above-mentioned optimization balances adjustment of the phase current by amplitude limit scale factor, balanced as far as possible and not out-of-limit phase current with obtaining one group of three-phase, so as to fully utilize existing apparatus capacity, and foundation is provided for D-STATCOM devices design components selection particularly used, and then ensure equipment safety operation.
Brief description of the drawings
Fig. 1 is the asymmetry compensation schematic diagram for the cascade connection type D-STATCOM that three-phase triangle is connected;
Fig. 2 is the structural representation of the power cell of single-phase bridge current transformer.
Fig. 3 is
Figure DEST_PATH_IMAGE114
Algorithm block diagram.
Fig. 4 occurs and device control schematic diagram for the pwm pulse of D-STATCOM compensation phase current.
Fig. 5 is the circuit topological structure figure of a phase in Cascade H type current transformer.
Fig. 6 is the structural representation of single-phase full bridge module.
Fig. 7 is the control signal oscillogram of single-phase full bridge module.
 
Fig. 8 is that half period phase shift emulates schematic diagram.
Fig. 9 emulates schematic diagram for the output of single-phase full bridge module;
Figure 10 is the output emulation schematic diagram after the three logical signals superposition of single-phase full bridge module;
Figure 11 is the emulation schematic diagram of threephase load electric current;
Figure 12 is three-phase system electric current and the emulation schematic diagram of a phase voltages;
Amplitude limit line current outputs and the emulation schematic diagram of non-amplitude limit line current of the Figure 13 for D-STATCOM;
Amplitude limit phase current outputs and the emulation schematic diagram of non-amplitude limit phase current of the Figure 14 for D-STATCOM;
Wherein, the symbol in Fig. 3 is represented respectively:- a phase voltages, PLL-phaselocked loop, LPF-low pass filter,
Figure DEST_PATH_IMAGE118
Figure DEST_PATH_IMAGE120
Figure DEST_PATH_IMAGE122
- a, b, c threephase load electric current,
Figure DEST_PATH_IMAGE124
- load current α axle components,- load current beta -axis component,
Figure DEST_PATH_IMAGE128
Figure DEST_PATH_IMAGE130
Figure DEST_PATH_IMAGE132
- a, b, c three-phase compensation line current,
Figure DEST_PATH_IMAGE134
- compensation electric current α axle components,
Figure DEST_PATH_IMAGE136
- compensation electric current beta -axis component,
Figure DEST_PATH_IMAGE138
- Clarke transformation matrixs,- Clarke reverse transform matrix,
Figure DEST_PATH_IMAGE142
- Park transformation matrixs,
Figure DEST_PATH_IMAGE144
- Park reverse transform matrix, and
Figure 593035DEST_PATH_IMAGE138
Figure 982876DEST_PATH_IMAGE142
With
Figure 816840DEST_PATH_IMAGE144
Respectively
Figure DEST_PATH_IMAGE146
Figure DEST_PATH_IMAGE150
Embodiment
As shown in figure 1, the cascade connection type D-STATCOM of three-phase triangle connection grid connected structure includes CPU element, main part and simultaneously mesh portions;Main part is made up of cascade converter 1 and connection reactance 2, and mesh portions include power network 3 and load 4.A kind of reactive power compensator D-STATCOM of the present embodiment includes cascade converter 1, connection reactance 2 and CPU element.The each phase of the cascade converter 1 hasnIndividual power cell, i.e. a1~an, b1~bn, c1~cn, with phasenEach contacted again with being connected reactance 2 after individual power unit cascade, i.e. a1~anWith
Figure 580528DEST_PATH_IMAGE002
, b1~bnWith
Figure 525350DEST_PATH_IMAGE004
, c1~cnWith
Figure 877834DEST_PATH_IMAGE006
Series connection;And
Figure 633432DEST_PATH_IMAGE002
Be connected with c1,
Figure 71366DEST_PATH_IMAGE004
Be connected with a1,
Figure 554300DEST_PATH_IMAGE006
It is connected with b1, forms three-phase triangle head and the tail and connect.CPU element is connected with each power cell control end of cascade converter 1;D-STATCOM three-phase is provided with measurement phase current
Figure 26870DEST_PATH_IMAGE008
The first current transformer group, grid-connected place sets measurement line current
Figure 953369DEST_PATH_IMAGE010
The second current transformer group, load 4 sides provided with measurement load current
Figure 878599DEST_PATH_IMAGE012
The 3rd current transformer group, the side of power network 3 be provided with measuring system electric current
Figure 165224DEST_PATH_IMAGE014
The 4th current transformer group, and measurement power network a phase voltage
Figure 226721DEST_PATH_IMAGE016
Voltage transformer.
As shown in Fig. 2 each power cell of the cascade converter 1 includes two groups of IGBT units and DC filter capacitor C;Each group IGBT units include two IGBT modules of upper IGBT module and lower IGBT module;The upper IGBT module and lower IGBT module include:IGBT and fly-wheel diode, the anode of the fly-wheel diode connect IGBT emitter stage, and the negative electrode of the fly-wheel diode connects IGBT colelctor electrode, and each IGBT grid is the rectification control end of the three-phase full-controlled rectifier bridge A;IGBT emitter stage connects the colelctor electrode of IGBT in lower IGBT module in the upper IGBT module;IGBT colelctor electrode connects the emitter stage of IGBT in the positive pole of the DC filter capacitor C, each lower IGBT module and connects the negative pole of the DC filter capacitor C in each upper IGBT module;Contact Xs of the contact Y of lower IGBT module with the upper IGBT module of latter power cell is connected in every group of IGBT unit, i.e., contact Ys of the contact X of upper IGBT module with the lower IGBT module of previous power cell is connected in every group IGBT unit.
A kind of phase current balance amplitude limiting method of D-STATCOM of the present embodiment line current asymmetry compensation, CPU element detects threephase load transient current by the load-side current transformer
Figure 511072DEST_PATH_IMAGE012
.As shown in figure 3, according to
Figure 736648DEST_PATH_IMAGE114
Algorithm, by threephase load electric current
Figure 764647DEST_PATH_IMAGE012
The three-phase line current of compensation needed for obtaining D-STATCOM
Figure 8546DEST_PATH_IMAGE010
Step one:Ask for three-phase line current
Figure 198219DEST_PATH_IMAGE010
Corresponding optimal balance phase current
Figure DEST_PATH_IMAGE152
.Respectively with vector
Figure 911091DEST_PATH_IMAGE030
With
Figure 539519DEST_PATH_IMAGE032
Represent D-STATCOM one group of line current
Figure 841187DEST_PATH_IMAGE010
With corresponding balance phase current
Figure 14811DEST_PATH_IMAGE034
, then
Figure 401930DEST_PATH_IMAGE032
It is represented by:
Figure 834048DEST_PATH_IMAGE036
Formula (1)
Wherein,
Figure 724644DEST_PATH_IMAGE038
,
Figure 521698DEST_PATH_IMAGE040
,
Figure DEST_PATH_IMAGE154
,
Figure 937724DEST_PATH_IMAGE044
The maximum of the absolute value of triple line current instantaneous value is taken, i.e.,
Figure DEST_PATH_IMAGE156
Formula (2)
In the required compensation triple line current instantaneous value of above-mentioned acquisition
Figure 173533DEST_PATH_IMAGE010
In,
When
Figure DEST_PATH_IMAGE158
Maximum, i.e.,
Figure DEST_PATH_IMAGE160
When, then optimal balance phase currentIt is expressed as by equation (1)
Figure DEST_PATH_IMAGE162
Formula (8)
When
Figure DEST_PATH_IMAGE164
Maximum, i.e.,
Figure DEST_PATH_IMAGE166
When, then optimal balance phase currentIt can be expressed as by equation (1)
Figure DEST_PATH_IMAGE168
Formula (9)
When
Figure DEST_PATH_IMAGE170
Maximum, i.e.,
Figure DEST_PATH_IMAGE172
When, then optimal balance phase current
Figure 812084DEST_PATH_IMAGE152
It can be expressed as by equation (1)
Figure DEST_PATH_IMAGE174
Formula (10)
Step 2:To balance phase current obtained by step one
Figure 586005DEST_PATH_IMAGE032
Amplitude limiting processing is carried out, balance amplitude limiting phase current is drawn
Figure 264243DEST_PATH_IMAGE056
Ask for amplitude limit scale factork,
Figure 403100DEST_PATH_IMAGE048
Formula (3)
That is, when
Figure DEST_PATH_IMAGE176
More than device phase current limit of compensation
Figure DEST_PATH_IMAGE178
When, then amplitude limit scale factorkTake
Figure DEST_PATH_IMAGE180
;When
Figure 861894DEST_PATH_IMAGE052
Less than or equal to device phase current limit of compensationWhen, then amplitude limit scale factorkTake 1.
By above-mentioned gained optimal balance phase current instantaneous value
Figure 159200DEST_PATH_IMAGE152
With amplitude limit scale factorkMake product, ask for balance amplitude limiting phase current vector
Figure 468959DEST_PATH_IMAGE056
,
Figure 352732DEST_PATH_IMAGE058
Formula (5)
Obtain the optimal balance phase current instantaneous value after amplitude limiting processing, i.e.,
Formula (11)
Step 3:The generation of pwm pulse is controlled with device;
Obtain vector obtained by step 2
Figure 468456DEST_PATH_IMAGE060
With the compensation phase current vector of D-STATCOM reality outputs
Figure 121285DEST_PATH_IMAGE062
Deviation
Figure 601945DEST_PATH_IMAGE064
Afterwards, by the deviation
Figure 956703DEST_PATH_IMAGE064
Modulation wave signal is exported after being adjusted through proportion integral control device
Figure 813801DEST_PATH_IMAGE066
, then to the modulation wave signalHandled using phase-shifting carrier wave pulse width modulation algorithm and produce corresponding many level PWM pulses, many level PWM pulses are controlled to the cascade converter in D-STATCOM, to produce corresponding balance amplitude limiting phase current.
As shown in figure 4, the pwm pulse of D-STATCOM compensation phase current occurs and device control schematic diagram.CPS-SPWM technologies are the combinations of multiple technology and SPWM technologies.The technology can realize the effect of higher equivalent switching frequency under relatively low devices switch frequency, with good harmonic characterisitic.CPS-SPWM modulation techniques are applied to cascade h-bridge converter.The circuit topological structure of a phase is as shown in Figure 5 in Cascade H type current transformer.
CPS-SPWM modulation algorithms are specially:In the single-phase full bridge module of structure as shown in Figure 6, frequency is
Figure DEST_PATH_IMAGE186
, the cycle is
Figure DEST_PATH_IMAGE188
Triangular wave
Figure DEST_PATH_IMAGE190
It is with frequency
Figure DEST_PATH_IMAGE192
The intersection point of modulating wave be used as switch
Figure DEST_PATH_IMAGE196
Switching point, and
Figure 842205DEST_PATH_IMAGE194
Figure 949838DEST_PATH_IMAGE196
Gate signal it is complementary such as g in Fig. 71、g4It is shown.Triangular wave
Figure DEST_PATH_IMAGE198
With
Figure 158097DEST_PATH_IMAGE190
Amplitude is equal, opposite in phase.
Figure DEST_PATH_IMAGE200
In be used as switch with the intersection point of modulating wave
Figure 769206DEST_PATH_IMAGE194
Figure 857248DEST_PATH_IMAGE196
Switching point, g in such as Fig. 72、g3It is shown.nWhen individual single-phase full bridge module uses identical modulating wave, triangular wave
Figure DEST_PATH_IMAGE202
Figure DEST_PATH_IMAGE206
…、
Figure DEST_PATH_IMAGE208
Phase differ successively
Figure DEST_PATH_IMAGE210
, i.e., " half period phase shift ".WithnExemplified by 4, its half period phase shift emulation schematic diagram is as shown in Figure 8;The output emulation schematic diagram of each module is as shown in Figure 9;The output of each module is the superposition that two triangular waves intersect the pwm signal produced with modulating wave, is three logical signals, exports as shown in Figure 10 after superposition.
Simulation result as shown in Figure 11,12,13,14 is carried out in following precondition:D-STATCOM is per 5 power unit cascades of phase, often be in series a 50mH inductance, DC capacitor C voltage is controlled in 600V, load (10+j50) kVA inductive loads by a three-phase symmetrical, one DC loop seals in three phased rectifier bridges of the resistance inductive load of (12 Ω+10mH), is put into operation respectively in 0.04s and 0.1s.The emulation schematic diagram of threephase load electric current is as shown in figure 11, three-phase system electric current and the emulation schematic diagram of a phase voltages are as shown in figure 12, as shown in figure 13, D-STATCOM amplitude limit phase current output and the emulation schematic diagram of non-amplitude limit phase current are as shown in figure 14 for D-STATCOM amplitude limit line current output and the emulation schematic diagram of non-amplitude limit line current.
Above-described embodiment is only intended to clearly illustrate example of the present invention, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, it can also make other changes in different forms on the basis of the above description.There is no necessity and possibility to exhaust all the enbodiments.And among the obvious change or variation that these spirit for belonging to the present invention are extended out are still in protection scope of the present invention.

Claims (1)

1. the phase current balance amplitude limiting method of a kind of D-STATCOM line current asymmetry compensation, it is characterised in that comprise the following steps:
Step one:Ask for the balance phase current corresponding to one group of line current;
Respectively with vector
Figure 2012101722557100001DEST_PATH_IMAGE002
With
Figure 2012101722557100001DEST_PATH_IMAGE004
Represent D-STATCOM one group of line currentWith corresponding balance phase current
Figure 2012101722557100001DEST_PATH_IMAGE008
, then
Figure 277403DEST_PATH_IMAGE004
It is represented by:
Figure 2012101722557100001DEST_PATH_IMAGE010
Formula (1)
Wherein,
Figure 2012101722557100001DEST_PATH_IMAGE012
,
Figure 2012101722557100001DEST_PATH_IMAGE014
,
Figure 2012101722557100001DEST_PATH_IMAGE016
,
Figure 2012101722557100001DEST_PATH_IMAGE018
The maximum of the absolute value of triple line current instantaneous value is taken, i.e.,
Figure 2012101722557100001DEST_PATH_IMAGE020
Formula (2)
Step 2:To balance phase current obtained by step oneCarry out amplitude limiting processing;
Ask for amplitude limit scale factorkkIt is represented by
Figure 2012101722557100001DEST_PATH_IMAGE022
Formula (3)
Wherein,
Figure 2012101722557100001DEST_PATH_IMAGE024
For D-STATCOM phase current limit of compensation,
Figure 2012101722557100001DEST_PATH_IMAGE026
The maximum of the absolute value of a certain group of balance phase current instantaneous value is taken, i.e.,
Figure 2012101722557100001DEST_PATH_IMAGE028
Formula (4)
Ask for the vector of the balance phase current after amplitude limiting processing
Figure 2012101722557100001DEST_PATH_IMAGE030
Figure 505702DEST_PATH_IMAGE030
It is represented by
Figure 2012101722557100001DEST_PATH_IMAGE032
Formula (5)
Step 3:The generation of pwm pulse is controlled with device;
Obtain vector obtained by step 2
Figure 2012101722557100001DEST_PATH_IMAGE034
With the compensation phase current vector of D-STATCOM reality outputs
Figure 2012101722557100001DEST_PATH_IMAGE036
Deviation
Figure 2012101722557100001DEST_PATH_IMAGE038
Afterwards, by the deviation
Figure 657589DEST_PATH_IMAGE038
Modulation wave signal is exported after being adjusted through proportion integral control device
Figure 2012101722557100001DEST_PATH_IMAGE040
, then to the modulation wave signal
Figure 474235DEST_PATH_IMAGE040
Handled using phase-shifting carrier wave pulse width modulation algorithm and produce corresponding many level PWM pulses, many level PWM pulses are controlled to the cascade converter in D-STATCOM, to produce corresponding balance amplitude limiting phase current.
CN2012101722557A 2012-05-30 2012-05-30 Phase current balancing and amplitude-limiting method for asymmetrical compensation of line current of distribution static compensator (D-STATCOM) Pending CN102694385A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103746551A (en) * 2014-01-22 2014-04-23 哈尔滨工业大学 Current closed loop combined regulation system of bidirectional triple DC (direct current)-DC converter
US10218285B2 (en) 2015-10-19 2019-02-26 Siemens Aktiengesellschaft Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter
CN112688339A (en) * 2020-12-17 2021-04-20 合肥工业大学 Compensation current amplitude limiting method and device of three-phase unbalance regulator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040071000A1 (en) * 2001-02-01 2004-04-15 Gerardo Escobar Adaptive controller for d-statcom in the stationary reference frame to compensate for reactive and harmonic distortion under unbalanced conditions
CN102081114A (en) * 2010-11-29 2011-06-01 江苏省电力公司泰州供电公司 Instantaneous symmetrical component method-based current detection method for distribution static synchronous compensator (DSTATCOM)
CN102222925A (en) * 2011-06-15 2011-10-19 江苏省电力公司常州供电公司 Phase current balance method for line current asymmetric compensation of D-STATCOM
CN202145570U (en) * 2011-06-15 2012-02-15 江苏省电力公司常州供电公司 Phase current balancing device of line current asymmetric compensation of D-STATCOM
JP2012080666A (en) * 2010-09-30 2012-04-19 Toshiba Corp Power conversion device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040071000A1 (en) * 2001-02-01 2004-04-15 Gerardo Escobar Adaptive controller for d-statcom in the stationary reference frame to compensate for reactive and harmonic distortion under unbalanced conditions
JP2012080666A (en) * 2010-09-30 2012-04-19 Toshiba Corp Power conversion device
CN102081114A (en) * 2010-11-29 2011-06-01 江苏省电力公司泰州供电公司 Instantaneous symmetrical component method-based current detection method for distribution static synchronous compensator (DSTATCOM)
CN102222925A (en) * 2011-06-15 2011-10-19 江苏省电力公司常州供电公司 Phase current balance method for line current asymmetric compensation of D-STATCOM
CN202145570U (en) * 2011-06-15 2012-02-15 江苏省电力公司常州供电公司 Phase current balancing device of line current asymmetric compensation of D-STATCOM

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
何大清等: "柔性直流输电的动态电流限幅控制", 《电网技术》 *
杨振宇等: "并联型有源电力滤波器限流补偿策略研究", 《电力自动化设备》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103746551A (en) * 2014-01-22 2014-04-23 哈尔滨工业大学 Current closed loop combined regulation system of bidirectional triple DC (direct current)-DC converter
CN103746551B (en) * 2014-01-22 2016-06-08 哈尔滨工业大学 The current closed-loop compound regulation system of two-way triple DC-DC converter
US10218285B2 (en) 2015-10-19 2019-02-26 Siemens Aktiengesellschaft Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter
CN112688339A (en) * 2020-12-17 2021-04-20 合肥工业大学 Compensation current amplitude limiting method and device of three-phase unbalance regulator

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