CN106058890B - The asymmetric Restart Method and control system of STATCOM power module - Google Patents
The asymmetric Restart Method and control system of STATCOM power module Download PDFInfo
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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
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present invention relates to the asymmetric Restart Methods and control system of STATCOM power module, detect the state that each power module returns, if there is exception, then, STATCOM stops working；When STATCOM meets the redundancy running condition, abnormal power module bypass is controlled；It is delayed to the triangular carrier frequency of each normal power module of every phase, modulated triangular wave initial phase and DC voltage given value is readjusted；By parametric distribution adjusted to each corresponding power module；The abnormality of abnormal power module is shielded, controls each normal power module again, realizes that asymmetry is restarted.Pass through the positioning bypass operation of abnormal power module, readjust control parameter, it finally carries out asymmetry and restarts control, STATCOM restarts to greatest extent after realizing failure, solves the problems, such as reliability, applicability existing for existing chain type STATCOM power module bypass mode and Restart Method.
Description
Technical field
The present invention relates to the asymmetric Restart Methods and control system of STATCOM power module.
Background technique
Static synchronous compensator (STATCOM) is a kind of power quality problem dynamic benefit based on electronic power switch device
Repay and controlling device, have working range wider, capacity is bigger, response speed faster, the advantages that harmonic characterisitic is good, small in size,
As forth generation compensation device, the developing direction of power quality problem dynamic compensation is represented.Currently in order to being applied to high voltage
Large capacity occasion, generallys use the concatenated mode of power module, forms chain structure to be adapted to the occasion of high voltage large capcity,
Wherein power module can use H bridge-type structure, three level-type structures or more level-type structures, and voltage class is higher, and every phase needs
Concatenated power module number is more, this undoubtedly increases the likelihood of failure of equipment.Due to using concatenated structure, when certain is mutually sent out
After raw one or more power module exception, package unit will be out of service, will reduce the reliability of device in this way.
In order to improve the reliability of device, common power module exception solution has: the first, by controlling power
The mode short-circuit power module that module middle left and right bridge arm upper switch pipe or left and right bridge arm lower switch pipe are opened simultaneously, to realize
Module bypass.This method is needed in power module control circuit, driving circuit and the corresponding equal normal condition of power switch tube
It is lower to be just able to achieve, and power switch tube is rapid wear device, therefore this bypass mode cannot be fully solved power module and ask extremely
Topic.Second, automatic short-circuit is carried out in an output port of power module, to realize the bypass of entire power module, wherein
The method for realizing short circuit, generallys use the switching mechanisms such as contactor or thyristor, compares first way, and this mode can solve
The problem of still capable of certainly being bypassed after power module exception.The redundancy control method taken after bypass has following defects that 1) reliable
Property problem generallys use the mode symmetrically bypassed for simplified control method, and three phase power module is all bypassed to equal power
Number of modules, to keep the power module number of every phase operation consistent.When other are mutually no abnormal, this mode of restarting still is needed
Bypass normal power module, to realize the symmetrical operation of power module, however when other positions power module again
When being abnormal, probably due to normal power module is bypassed, the number of modules of bypass is made to have reached every phase non-firm power module
The upper limit, and cannot achieve bypass and restart；2) problem poor for applicability, operation after bypass is it is generally necessary to which drop capacity runs, is defeated
Asymmetric phase voltage out realizes line of symmetry voltage output, therefore this redundancy control method application model by neutral point drifting
Enclosing is restricted, and may be only available for the chain type STATCOM of the Y type mode of connection；3) compensation performance problem is restarted after bypass, every phase
Master switch frequency reduces, and will be deteriorated to the effect of reactive compensation and harmonic compensation.
Summary of the invention
It is existing to solve the object of the present invention is to provide a kind of asymmetric Restart Method of STATCOM power module
Chain type STATCOM power module Restart Method poor reliability the problem of.Present invention simultaneously provides a kind of STATCOM power moulds
The asymmetry of block restarts control system.
To achieve the above object, the solution of the present invention includes a kind of asymmetric Restart Method of STATCOM power module,
The following steps are included:
(1) state that each power module returns is detected, if there is the state of power module is abnormality, then, block
The driving signal of all power modules of three-phase, makes STATCOM stop working；
(2) judge whether STATCOM meets redundancy running condition, when meeting the redundancy running condition, control abnormal
Power module bypass；
(3) according to the number of the number of the bypass power module of every phase and normal power module, to each normal function of every phase
Triangular carrier frequency, the delay of modulated triangular wave initial phase and the DC voltage given value of rate module carry out readjustment calculating；
(4) by each parametric distribution adjusted to each corresponding normal power module；
(5) pulse control signal of the normal module of each correspondence is obtained according to each parameter adjusted, then basis obtains
Pulse control signal is corresponding to control each normal power module, realizes that asymmetry is restarted.
The redundancy running condition are as follows: for any one phase, when the number of the abnormal power module of the phase has been bypassed with the phase
The sum of the number of power module be less than or equal to the number of the mutually spare power module.
It is further comprising the steps of between the step (2) and step (3): to readjust the normal module and control in every phase
The corresponding relationship of position, specifically: for any one phase, mutually under normal circumstances according to this by the normal power module in the phase
The sequencing of all power modules is successively sorted again, the corresponding serial number of each normal power module be it is corresponding just
The control bit of normal power module.
Triangular carrier frequency calculation formula in the step (3) are as follows:
Or
Wherein,
faFor the frequency of A phase triangular carrier adjusted, fbFor the frequency of B phase triangular carrier adjusted, fcIt is adjusted for C phase
The frequency of triangular carrier after whole, NaFor the number of A phase normal power module, NbFor the number of B phase normal power module, NcFor C
The number of phase normal power module, N are the number of every mutually all power modules, f0For the initial of three phase power module triangular carrier
Given frequency, fsumFor the sum frequency given value of every phase power module triangular carrier.
The calculation formula of modulated triangular wave initial phase delay in the step (3) are as follows:
Or
Wherein, the value of n is since 1 and the end value of n is the number N of the normal power module of corresponding phasea、Nb、Nc；θan
For the adjusted value that the triangular wave initial phase of n-th of normal power module of A phase is delayed, θbnFor n-th of normal power module of B phase
The adjusted value of triangular wave initial phase delay, θcnThe adjustment being delayed for the triangular wave initial phase of n-th of normal power module of C phase
Value, NaFor the number of A phase normal power module, NbFor the number of B phase normal power module, NcFor the number of C phase normal power module
Mesh, TaFor the period of A phase triangular carrier, TbFor the period of B phase triangular carrier, TcFor the period of C phase triangular carrier, faFor A phase three
The frequency of angle carrier wave, fbFor the frequency of B phase triangular carrier, fcFor the frequency of C phase phase shift carrier modulating method triangular carrier.
The calculation formula of DC voltage given value in the step (3) are as follows:
Or
Wherein, Uref_aFor the adjusted value of A phase DC voltage given value, Uref_bFor the adjustment of B phase DC voltage given value
Value, Uref_cFor the adjusted value of C phase DC voltage given value, NaFor the number of A phase normal power module, NbFor B phase normal power
The number of module, NcFor the number of C phase normal power module, N is the number of every mutually all power modules, Uref0For all power
When module is normal, the DC voltage initially given, Usum_refFor given direct current total voltage value.
In the step (3), also need to calculate the direct current average voltage level of every phase, calculation formula are as follows:
Wherein, Uavr_aFor A phase DC voltage average value adjusted, Uavr_bIt is average for B phase DC voltage adjusted
Value, Uavr_cFor C phase DC voltage average value adjusted, NaFor the number of A phase normal power module, NbFor B phase normal power
The number of module, NcFor the number of C phase normal power module, Udc_anFor the DC voltage value of n-th of normal power module of A phase,
Udc_anFor the DC voltage value of n-th of normal power module of B phase, Udc_anFor the DC voltage of n-th of normal power module of C phase
Value.
A kind of asymmetry of STATCOM power module restarts control system, comprising:
Detection module, the state returned for detecting each power module, if there is the state of power module is abnormality,
So, the driving signal of all power modules of block three-phase, makes STATCOM stop working；
Judgment module, for judging whether STATCOM meets redundancy running condition, when meeting the redundancy running condition,
The abnormal power module bypass of control；
Adjust module, for according to every phase bypass power module number and normal power module number, to every phase
Each normal power module triangular carrier frequency, modulated triangular wave initial phase delay and DC voltage given value carry out again
Adjustment calculates；
Distribution module is used for each parametric distribution adjusted to each corresponding normal power module；
Restart control module, the pulse control for obtaining the normal module of each correspondence according to each parameter adjusted is believed
Number, each normal power module then is controlled according to obtained pulse control signal is corresponding, realizes that asymmetry is restarted.
The redundancy running condition are as follows: for any one phase, when the number of the abnormal power module of the phase has been bypassed with the phase
The sum of the number of power module be less than or equal to the number of the mutually spare power module.
The control system further includes sorting module, corresponding with control bit for readjusting the normal module in every phase
Relationship, specifically: for any one phase, by the normal power module in the phase according to all function of phase under normal circumstances
The sequencing of rate module is successively sorted again, and the corresponding serial number of each normal power module is corresponding normal power mould
The control bit of block.
In the asymmetric Restart Method of STATCOM power module provided by the invention, first determine whether that each power module returns
The state returned, if there is the state of power module is abnormality, then, indicate have power module for abnormal mould in STATCOM
Block, or referred to as malfunctioning module, then, the driving signal of all power modules of block three-phase makes STATCOM stop working,
Restart for subsequent asymmetry and prepares；Then judge whether STATCOM meets redundancy running condition, transported when meeting the redundancy
When row condition, abnormal power module bypass is controlled；Also, according to the number and normal power mould of the bypass power module of every phase
The number of block, to the triangular carrier frequency of the normal power module of every phase, the delay of modulated triangular wave initial phase and DC voltage
Given value is readjusted；And by parametric distribution adjusted to corresponding each normal power module；Finally to abnormal function
The abnormality of rate module is shielded, and is reopened the pulse control signal of each normal power module, is utilized readjustment
Parameter corresponding power module is controlled, realize asymmetry restart.So this method passes through abnormal power module
Bypass operation is positioned, the abnormality of abnormal module is excluded, readjusts control parameter, asymmetry is finally carried out and restarts control
System, chain type STATCOM restarts to greatest extent after realizing failure, solves existing chain type STATCOM power module bypass side
Reliability existing for formula and Restart Method, applicability problem, the reliability of this method has obtained greatly being promoted, and fits
It is run greatly, without reducing capacity with range, idle and harmonic compensation effect is good.The asymmetry Restart Method is suitable for appointing simultaneously
The positioning for the power module what is realized by bypass instruction bypasses, and restarts control.In addition, the asymmetry Restart Method
It is not only applicable to the chain type STATCOM of the Y type mode of connection, and is suitable for the chain type STATCOM of the △ type mode of connection simultaneously, is fitted
It is wider with range.
Detailed description of the invention
Fig. 1 is the asymmetric Restart Method overall flow figure of STATCOM power module；
Fig. 2 is the asymmetric Restart Method detail flowchart of STATCOM power module；
Control process schematic illustration when Fig. 3 is power module exception；
Fig. 4 is the control process schematic illustration of positioning bypass；
The correspondence diagram of module and control bit when Fig. 5-a is no abnormal power module；
Fig. 5-b is the correspondence diagram of the module and control bit when having abnormal power module；
Fig. 6 is control parameter adjustment process schematic；
The voltage distribution schematic diagram of each power module when Fig. 7 is asymmetric restarts；
Wherein, in Fig. 5-b, black box represents abnormal power module, and control bit does not distribute, and white box represents just
Normal power module controls bit allocation；
In Fig. 7, dark circles represent abnormal power module, output voltage 0, and white circular represents normal power module,
Output voltage is K*U, K=N/Na, U=Uref0.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
Embodiment of the method
In the present embodiment, STATCOM is by taking more common chain type STATCOM as an example.STATCOM is mating to be provided with one
Master controller, the master controller are connect with STATCOM, for controlling the operation of STATCOM, so, it is provided by the invention
The asymmetric Restart Method of STATCOM power module can be set in the host controller, the control program as the controller
Realize the control to STATCOM, since the master controller is the prior art, the particular content about the controller is just no longer in detail
Thin description.In addition, if STATCOM does not have matched master controller, but controlled using the control system of entire electric system
System, then, which is arranged in the controls to realize the control to STATCOM as software program.
As depicted in figs. 1 and 2, the STATCOM power module asymmetric Restart Method the following steps are included:
Step 1: the state that chain type STATCOM master controller real-time detection STATCOM three phase power module returns, such as Fig. 3
It is shown, when detecting an abnormal condition it, show there is abnormal power module or referred to as failure in the power module in STATCOM
Power module, then, master controller blocks the switching tube drive pulse signal of power module all in three-phase, makes STATCOM
In shutdown status.STATCOM stops working, and restarts for subsequent bypass with asymmetry and lays the foundation.
Step 2: the state that master controller is returned according to each power module is obtained when the abnormal function in three-phase in every phase
The number of rate module, then judges whether STATCOM meets redundancy running condition, that is, judges whether the STATCOM can be with redundancy
Operation executes positioning bypass operation to abnormal power module, controls abnormal power mould when meeting the redundancy running condition
Block bypass, and abnormal power module returns to bypass condition to master controller, as shown in Figure 4.
In the present embodiment, a kind of specific redundancy running condition is provided, are as follows: for any one phase, when the abnormal function of the phase
The sum of number of power module that the number of rate module has been bypassed with the phase is less than or equal to the mutually spare power module
Number.If STATCOM meets the redundancy running condition, Bypass Control can be carried out.
For ease of description, the redundancy running condition is described in detail using inequality, specific as follows:
The state that all modules of the master controller real-time detection of chain type STATCOM return, obtains and works as three-phase abnormal module
Number: Nya、Nyb、Nyc, the number of all power modules is N in every phase, and the number of the non-firm power module of every phase is Nby,
Three-phase bypass module number (to bypass module number) Npa、Npb、Npa, while when meeting following relationship, chain type STATCOM three-phase is all
With redundancy running ability, master controller positions bypass instruction to three-phase abnormal power module sending module, obtains bypass condition；
Otherwise device does not have redundancy running ability, can not be restarted, and complete machine answers breaker open operation at this time, disconnects and connecting with bus
It connects.
Wherein, NyaFor the number of the abnormal power module of A phase；NybFor the number of the abnormal power module of B phase；NycIt is abnormal for C phase
The number of power module；NpaThe number of power module has been bypassed for A phase；NpbThe number of power module has been bypassed for B phase；NpcFor C
The number of power module is mutually bypassed；NbyFor the number of every phase non-firm power module.
In addition, after master controller sends bypass instruction the return of bypass condition will be waited, the waiting time is according to bypass mechanism
Parameter determine that typically 10s or more still has not been obtained after bypass operation and waiting all after time-out and in triplicate
Bypass condition, then master controller should report bypass refused action failure, and carry out trip protection.
Step 3: in order to which convenient for explanation, master controller, can be with according to the bypass condition of power module in subsequent calculating
Readjust the corresponding relationship of power module and control bit.
For any one phase, it is assumed that the number of all power modules is N in the phase, then, in normal state, i.e., should
When not having abnormal power module in phase, this N number of power module has a sequence, and the serial number of each power module is corresponding function
The control bit of rate module, the control bit of module 1 are 1, and the control bit of module 2 is 2, and the control bit of module 3 is 3 ... ..., module N
Control bit be N, as shown in Fig. 5-a.When there is M abnormal power module in the phase, by this M abnormal power module bypass
After falling, it is left N-M normal power module in the phase, by this N-M normal power module according to originally without abnormal conditions
Under the sequencings of all power modules resequence, will no longer be compiled with control bit when encountering abnormal power module
Number correspondence, at this time unappropriated control bit number with followed by first normal module it is corresponding, until all normal function
Rate module matches completion again.So the control bit in the N-M normal power module is 1 to N-M.By taking M=2 as an example, such as scheme
Shown in 5-b, module 3 and module 7 are abnormal power module, and in original situation, the control bit of module 3 and module 7 is control respectively
Position 3 and control bit 7, after the bypass of the two power modules, the control bit of module 1 is 1, and the control bit of module 2 is 2, module 3 by
In being in bypass condition, control bit is not distributed, so, with the back to back next normal module of the module 3 --- module 4 is distributed
For control bit 3, the control bit of module 5 is 4, and the control bit of module 6 is 5, module 7 due to being in bypass condition, control bit regardless of
Match, so, and the back to back next normal module of the module 7 --- module 8 is assigned as control bit 6, and the control bit of module 9 is
The control bit of 7 ... ..., module N are N-2.
Step 4: power module bypass condition returns, after master controller completes bypass, according to the bypass power module of every phase
Number and normal power module number, it is initial to triangular carrier frequency, the modulated triangular wave of the normal power module of every phase
Phase delay and DC voltage given value are readjusted, and the corresponding triangular wave carrier frequency of each normal power module is obtained
Rate, the initial phase delay of triangular wave and each power module DC voltage given value.Furthermore it is also possible to after solving bypass
Each phase DC voltage average value.If Fig. 6 gives a kind of sequencing of adjustment, still, this is one such reality
Apply mode, it should be noted that there is no sequencings for the process of these types of adjusting parameter.
It is specific as follows:
In order to guarantee idle and harmonic compensation effect, the switching tube frequency after positioning bypass in three phase power module should be at least
Equal to every mutually total switching frequency before not bypassing, therefore after positioning bypass, the triangular carrier frequency of each normal power module of three-phase
The calculation method of rate is as follows:
Or
Wherein,
fa--- the frequency of A phase triangular carrier adjusted, unit hertz；
fb--- the frequency of B phase triangular carrier adjusted, unit hertz；
fc--- the frequency of C phase triangular carrier adjusted, unit hertz；
Na--- the number of A phase normal power module；
Nb--- the number of B phase normal power module；
Nc--- the number of C phase normal power module；
N --- the number of every mutually all power modules；
f0--- the initial given frequency of three phase power module triangular carrier, unit hertz；
fsum--- the sum frequency given value of every phase power module triangular carrier, unit hertz.
Adjust the initial phase time-delay method of phase shift carrier modulating method triangular wave are as follows: after n-th of the control bit adjustment of every phase
Triangular wave preliminary examination phase delay calculation formula it is as follows, for n value since 1, the end value of every phase n is corresponding phase normal power mould
The number N of blocka、Nb、Nc；
Or
Wherein,
θan--- n-th of control bit of A phase triangular wave preliminary examination phase delay adjusted, unit second；
θbn--- n-th of control bit of B phase triangular wave preliminary examination phase delay adjusted, unit second；
θcn--- n-th of control bit of C phase triangular wave preliminary examination phase delay adjusted, unit second；
Na--- the number of A phase normal power module；
Nb--- the number of B phase normal power module；
Nc--- the number of C phase normal power module；
Ta--- the period of A phase phase shift carrier modulating method triangular carrier, unit second；
Tb--- the period of B phase phase shift carrier modulating method triangular carrier, unit second；
Tc--- the period of C phase phase shift carrier modulating method triangular carrier, unit second；
fa--- the frequency of A phase phase shift carrier modulating method triangular carrier, unit hertz；
fb--- the frequency of B phase phase shift carrier modulating method triangular carrier, unit hertz；
fc--- the frequency of C phase phase shift carrier modulating method triangular carrier, unit hertz；
Wherein, fa、fbAnd fcOriginal parameter can be used, can also be carried using by above-mentioned corresponding triangle adjusted
Wave frequency rate.
Adjust the following formula of method of the DC voltage given value of each power module:
Or
Wherein,
Uref_a--- the new DC voltage given value of A phase, unit volt；
Uref_b--- the new DC voltage given value of B phase, unit volt；
Uref_c--- the new DC voltage given value of C phase, unit volt；
Na--- the number of A phase normal power module；
Nb--- the number of B phase normal power module；
Nc--- the number of C phase normal power module；
N --- the number of every mutually all power modules；
Uref0--- when all power modules are normal, initial given DC voltage, unit volt；
Usum_ref--- given direct current total voltage value, unit volt.
Carrying out the control of direct current stagnation pressure and when Pressure and Control, master controller according to the power module bypass condition of return,
The DC voltage for not bypassing power module return is calculated, the direct current average voltage level of every phase is obtained, that is, ignores and be bypassed
The 1st control bit of every phase is corresponded to power module DC voltage to N by the DC voltage of unita、Nb、NcThe module of control bit is straight
Galvanic electricity pressure carries out mean value calculation, and calculation method is as follows；
Wherein,
Uavr_a--- A phase DC voltage average value value adjusted, unit volt；
Uavr_b--- B phase DC voltage average value value adjusted, unit volt；
Uavr_c--- C phase DC voltage average value value adjusted, unit volt；
Na--- the number of A phase normal power module；
Nb--- the number of B phase normal power module；
Nc--- the number of C phase normal power module；
Udc_an--- the corresponding power module DC voltage value of n-th of control bit of A phase, unit volt；
Udc_an--- the corresponding power module DC voltage value of n-th of control bit of B phase, unit volt；
Udc_an--- the corresponding power module DC voltage value of n-th of control bit of C phase, unit volt.
Step 5: above-mentioned steps adjust control parameter, the initial phase delay of the triangular wave after being adjusted,
Triangular wave carrier frequency, each power module DC voltage given value, every phase DC voltage average value, these adjusted values are as shifting
Phase carrier modulation, the control of direct current stagnation pressure and Pressure and Control corresponding control bit compensating instruction, the distribution of compensating instruction should be by
Matching distribution is carried out to the normal power module of correspondence according to normal power module corresponding control bit number.
Step 6: master controller is ignored the power module accordingly bypassed and is returned according to the bypass condition of the power module of return
Abnormality, to be shielded to its abnormality, and adjusted again according to the parameters adjusted of above-mentioned acquisition
Then the drive pulse signal of whole corresponding normal power module controls each normal power according to obtained drive pulse signal is corresponding
Module realizes that the asymmetry of chain type STATCOM is restarted, as shown in Figure 7.So far the asymmetry for completing chain type STATCOM opens again
It is dynamic.
Before progress asymmetry is restarted after power module positioning bypass, the master controller of chain type STATCOM is according to return
Power module bypass condition ignores the abnormality that bypass power module returns, so that its abnormality is shielded, this
When, when master controller detects entire STATCOM, abnormality is considered as having excluded, and joins using asymmetric operation adjusted
Number compensates control, and opens the drive pulse signal of three corresponding control bits, realizes the power module of chain type STATCOM not
Symmetrically restart.
Due to the number N of three-phase normal power modulea、Nb、NcAt a time there may be equal or unequal situation,
The triangular wave initial phase delays of three-phase normal power modules, triangular carrier frequency, directly can be obtained by above-mentioned several formula
Galvanic electricity pressure gives and direct current average voltage.Wherein work as Na、Nb、NcWhen not all equal, the triangular wave initial phase delay of three-phase, three
Angle carrier frequency, DC voltage are given and direct current average voltage is also unequal, and chain type STATCOM restarts in asymmetry at this time
State；It is a special case of the method, the triangular wave initial phase delay of three-phase, triangular carrier when Na, Nb, Nc are equal
Frequency and DC voltage give it is equal, at this time chain type STATCOM be in symmetrically restarts state, be equally applicable in the case of this kind
In method provided by the invention.And power module by-pass method any type of for chain type STATCOM, as long as passing through bypass
It instructs the contraposition bypass that power module can be achieved and bypass condition to return to this bypass mode of master controller, this can be used
Positioning bypass and its asymmetry Restart Method of the chain type STATCOM power module provided are provided.
Step 7: after completing step 1~6, positioning bypass and the asymmetric work restarted are completed, and work as master controller
It when the state that detection module returns is without new exception, can skip step 1~6 in later calculating process, directly utilize adjustment
Parameter afterwards, using original control method, the i.e. control of step 6 progress STATCOM.When detecting that it is new different that module returns again
Chang Shi, re-start step 1~6 carry out again positioning bypass and asymmetry restart.
By above step, it can be achieved that the positioning of chain type STATCOM power module bypasses and its asymmetric Restart Method,
Chain type STATCOM after can making failure has restarts ability to greatest extent, solves by existing chain type STATCOM power module
Reliability existing for Restart Method, applicability problem behind road.Asymmetric Restart Method passes through bypass suitable for any simultaneously
The contraposition bypass that power module can be achieved and bypass condition is instructed to restart control back to this bypass mode of master controller
System, the scope of application are wider.
Control system embodiment
The present invention also provides a kind of asymmetry of STATCOM power module to restart control system, comprising:
Detection module, the state returned for detecting each power module, if there is the state of power module is abnormality,
So, the driving signal of all power modules of block three-phase, makes STATCOM stop working；
Judgment module, for judging whether STATCOM meets redundancy running condition, when meeting the redundancy running condition,
The abnormal power module bypass of control；
Adjust module, for according to every phase bypass power module number and normal power module number, to every phase
Each normal power module triangular carrier frequency, modulated triangular wave initial phase delay and DC voltage given value carry out again
Adjustment calculates；
Distribution module is used for each parametric distribution adjusted to each corresponding normal power module；
Restart control module, the pulse control for obtaining the normal module of each correspondence according to each parameter adjusted is believed
Number, each normal power module then is controlled according to obtained pulse control signal is corresponding, realizes that asymmetry is restarted.
All modules in the control system are software module, are realized by executing corresponding software program each
From function, so, these software modules can be as each component part in the master controller of STATCOM, the main control
Device realizes the asymmetry Restart Method by load modules.Therefore, the control system substantially or control method,
Since this method there has been detailed description in above method embodiment, just no longer illustrate here.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is above-mentioned basic scheme, it is not limited to the calculating process of parameters.The principle of the present invention and essence are not being departed from
The change, modification, replacement and modification carried out in the case where mind to embodiment are still fallen in protection scope of the present invention.
Claims (8)
1. a kind of asymmetric Restart Method of STATCOM power module, which comprises the following steps:
(1) state that each power module returns is detected, if there is the state of power module is abnormality, then, block three-phase
The driving signal of all power modules, makes STATCOM stop working；
(2) judge whether STATCOM meets redundancy running condition, when meeting the redundancy running condition, control abnormal power
Module bypass；
(3) according to the number of the number of the bypass power module of every phase and normal power module, to each normal power mould of every phase
Triangular carrier frequency, the delay of modulated triangular wave initial phase and the DC voltage given value of block carry out readjustment calculating；
(4) by each parametric distribution adjusted to each corresponding normal power module；
(5) pulse control signal of the normal module of each correspondence is obtained according to each parameter adjusted, then according to obtained pulse
The corresponding each normal power module of control of signal is controlled, realizes that asymmetry is restarted；
The calculation formula of modulated triangular wave initial phase delay in the step (3) are as follows:
Or
Wherein, the value of n is since 1 and the end value of n is the number N of the normal power module of corresponding phasea、Nb、Nc；θanFor A
The adjusted value of the triangular wave initial phase delay of n-th of normal power module of phase, θbnIt is the three of n-th of normal power module of B phase
The adjusted value of angle wave initial phase delay, θcnThe adjustment being delayed for the triangular wave initial phase of n-th of normal power module of C phase
Value, NaFor the number of A phase normal power module, NbFor the number of B phase normal power module, NcFor the number of C phase normal power module
Mesh, TaFor the period of A phase triangular carrier, TbFor the period of B phase triangular carrier, TcFor the period of C phase triangular carrier, faFor A phase three
The frequency of angle carrier wave, fbFor the frequency of B phase triangular carrier, fcFor the frequency of C phase phase shift carrier modulating method triangular carrier；
In the step (3), also need to calculate the direct current average voltage level of every phase, calculation formula are as follows:
Wherein, Uavr_aFor A phase DC voltage average value adjusted, Uavr_bFor B phase DC voltage average value adjusted,
Uavr_cFor C phase DC voltage average value adjusted, NaFor the number of A phase normal power module, NbFor B phase normal power module
Number, NcFor the number of C phase normal power module, Udc_anFor the DC voltage value of n-th of normal power module of A phase, Udc_an
For the DC voltage value of n-th of normal power module of B phase, Udc_anFor the DC voltage value of n-th of normal power module of C phase；
The asymmetry Restart Method is used for the chain type STATCOM of the Y type mode of connection.
2. the asymmetric Restart Method of STATCOM power module according to claim 1, which is characterized in that described superfluous
Remaining service condition are as follows: for any one phase, when the number for the power module that the number of the abnormal power module of the phase has been bypassed with the phase
The sum of mesh is less than or equal to the number of the mutually spare power module.
3. the asymmetric Restart Method of STATCOM power module according to claim 1, which is characterized in that the step
Suddenly further comprising the steps of between (2) and step (3): the corresponding relationship of the normal module and control bit in every phase is readjusted,
Specifically: for any one phase, by the normal power module in the phase according to all power moulds of phase under normal circumstances
The sequencing of block is successively sorted again, and the corresponding serial number of each normal power module is corresponding normal power module
Control bit.
4. the asymmetric Restart Method of STATCOM power module according to claim 1, which is characterized in that the step
Suddenly the triangular carrier frequency calculation formula in (3) are as follows:
Or
Wherein,
faFor the frequency of A phase triangular carrier adjusted, fbFor the frequency of B phase triangular carrier adjusted, fcAfter being adjusted for C phase
Triangular carrier frequency, NaFor the number of A phase normal power module, NbFor the number of B phase normal power module, NcJust for C phase
The number of normal power module, N are the number of every mutually all power modules, f0For the initial given of three phase power module triangular carrier
Frequency, fsumFor the sum frequency given value of every phase power module triangular carrier.
5. the asymmetric Restart Method of STATCOM power module according to claim 1, which is characterized in that the step
Suddenly the calculation formula of the DC voltage given value in (3) are as follows:
Or
Wherein, Uref_aFor the adjusted value of A phase DC voltage given value, Uref_bFor the adjusted value of B phase DC voltage given value,
Uref_cFor the adjusted value of C phase DC voltage given value, NaFor the number of A phase normal power module, NbFor B phase normal power module
Number, NcFor the number of C phase normal power module, N is the number of every mutually all power modules, Uref0For all power modules
When normal, the DC voltage initially given, Usum_refFor given direct current total voltage value.
6. a kind of asymmetry of STATCOM power module restarts control system characterized by comprising
Detection module, the state returned for detecting each power module, if there is the state of power module is abnormality, that
, the driving signal of all power modules of three-phase is blocked, STATCOM is made to stop working；
Judgment module, for judging whether STATCOM meets redundancy running condition, when meeting the redundancy running condition, control
Abnormal power module bypass；
Adjust module, for according to every phase bypass power module number and normal power module number, to each of every phase
Triangular carrier frequency, the delay of modulated triangular wave initial phase and the DC voltage given value of normal power module are readjusted
It calculates；
Distribution module is used for each parametric distribution adjusted to each corresponding normal power module；
Restart control module, for obtaining the pulse control signal of the normal module of each correspondence according to each parameter adjusted, so
Each normal power module is controlled according to obtained pulse control signal is corresponding afterwards, realizes that asymmetry is restarted；
The calculation formula of modulated triangular wave initial phase delay in the adjustment module are as follows:
Or
Wherein, the value of n is since 1 and the end value of n is the number N of the normal power module of corresponding phasea、Nb、Nc；θanFor A
The adjusted value of the triangular wave initial phase delay of n-th of normal power module of phase, θbnIt is the three of n-th of normal power module of B phase
The adjusted value of angle wave initial phase delay, θcnThe adjustment being delayed for the triangular wave initial phase of n-th of normal power module of C phase
Value, NaFor the number of A phase normal power module, NbFor the number of B phase normal power module, NcFor the number of C phase normal power module
Mesh, TaFor the period of A phase triangular carrier, TbFor the period of B phase triangular carrier, TcFor the period of C phase triangular carrier, faFor A phase three
The frequency of angle carrier wave, fbFor the frequency of B phase triangular carrier, fcFor the frequency of C phase phase shift carrier modulating method triangular carrier；
In the adjustment module, also need to calculate the direct current average voltage level of every phase, calculation formula are as follows:
Wherein, Uavr_aFor A phase DC voltage average value adjusted, Uavr_bFor B phase DC voltage average value adjusted,
Uavr_cFor C phase DC voltage average value adjusted, NaFor the number of A phase normal power module, NbFor B phase normal power module
Number, NcFor the number of C phase normal power module, Udc_anFor the DC voltage value of n-th of normal power module of A phase, Udc_an
For the DC voltage value of n-th of normal power module of B phase, Udc_anFor the DC voltage value of n-th of normal power module of C phase；
The asymmetry restarts chain type STATCOM of the control system for the Y type mode of connection.
7. the asymmetry of STATCOM power module according to claim 6 restarts control system, which is characterized in that institute
State redundancy running condition are as follows: for any one phase, when the power module that the number of the abnormal power module of the phase has been bypassed with the phase
The sum of number be less than or equal to the number of the mutually spare power module.
8. the asymmetry of STATCOM power module according to claim 6 restarts control system, which is characterized in that institute
Stating control system further includes sorting module, for readjusting the corresponding relationship of normal module and control bit in every phase, specifically
Are as follows: for any one phase, by the normal power module in the phase according to the elder generation of all power modules of phase under normal circumstances
Sequence is successively sorted again afterwards, and the corresponding serial number of each normal power module is the control bit of correspondence normal power module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201956689U (en) * | 2010-12-31 | 2011-08-31 | 中电普瑞科技有限公司 | Bypass structure of chain link unit of static synchronous compensator |
| CN102780224A (en) * | 2012-08-08 | 2012-11-14 | 西安交通大学 | Seamless cut-off controlling method for chained multi-level inverter error unit |
| CN203522518U (en) * | 2013-11-01 | 2014-04-02 | 广东电网公司东莞供电局 | Chain type static var generator chain link online bypass circuit |
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| JP5941631B2 (en) * | 2011-07-26 | 2016-06-29 | 株式会社日立製作所 | Power converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201956689U (en) * | 2010-12-31 | 2011-08-31 | 中电普瑞科技有限公司 | Bypass structure of chain link unit of static synchronous compensator |
| CN102780224A (en) * | 2012-08-08 | 2012-11-14 | 西安交通大学 | Seamless cut-off controlling method for chained multi-level inverter error unit |
| CN203522518U (en) * | 2013-11-01 | 2014-04-02 | 广东电网公司东莞供电局 | Chain type static var generator chain link online bypass circuit |
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