CN106208648B - A kind of STATCOM power module abnormality eliminating method - Google Patents
A kind of STATCOM power module abnormality eliminating method Download PDFInfo
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- CN106208648B CN106208648B CN201610569574.XA CN201610569574A CN106208648B CN 106208648 B CN106208648 B CN 106208648B CN 201610569574 A CN201610569574 A CN 201610569574A CN 106208648 B CN106208648 B CN 106208648B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
Abstract
The present invention relates to a kind of STATCOM power module abnormality eliminating methods, detect the state that each power module returns, if there is abnormality, then, the connection between STATCOM and bus is disconnected, and control STATCOM ground connection, realizes the electric discharge of STATCOM DC voltage；Each abnormal power module is shorted using conductor to realize bypass, and the corresponding position of each abnormal power module is set to controller；Judge whether STATCOM meets redundancy running condition, when meeting the redundancy running condition, readjusts the corresponding relationship between normal power module and control bit；Realize that the asymmetry of STATCOM is restarted using Pressure and Control strategy.This method is suitable for the STATCOM of none-disk terminal mechanism, readjusts the corresponding relationship between normal module and control bit by artificially bypassing abnormal module and controller according to the abnormal module position being artificially arranged to realize that asymmetry restarts control.
Description
Technical field
The present invention relates to a kind of STATCOM power module abnormality eliminating methods.
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.It is second, short-circuit using switching mechanism in an output port of power module, to realize the bypass of entire power module,
Switching mechanism generallys use the switchgears such as contactor or thyristor, compares first way, and this mode can solve power
The problem of still capable of being bypassed after module exception.But have following defects that 1) integrity problem, it relies primarily in power module and controls
Element processed realizes bypass, can not achieve bypass and redundancy running after control circuit in power module or bypass mechanism exception；
2) redundancy running is at high cost, and bypass operation needs each power module to assemble bypass mechanism, due to chain type STATCOM power module
Number is more, will increase the complexity of cost and equipment；3) redundancy running method applicability is poor, and operation usually requires drop after bypass
Capacity operation exports asymmetric phase voltage, realizes line of symmetry voltage output, therefore this processing method by neutral point drifting
Application range is restricted, and may be only available for the chain type STATCOM of the Y type mode of connection.
Summary of the invention
The object of the present invention is to provide a kind of STATCOM power module abnormality eliminating methods, to solve STATCOM power
Module is when occurring abnormal the problem of existing processing method poor reliability.
To achieve the above object, the solution of the present invention includes a kind of STATCOM power module abnormality eliminating method, including with
Lower step:
(1) state that each power module returns is detected, if there is the state of power module is abnormality, then, it disconnects
Connection between STATCOM and bus, and STATCOM ground connection is controlled, realize the electric discharge of STATCOM DC voltage；
(2) each abnormal power module is shorted using conductor to realize bypass, and each abnormal function is set to controller
The corresponding position of rate module；
(3) judge whether STATCOM meets redundancy running condition, when meeting the redundancy running condition, readjust just
Corresponding relationship between normal power module and control bit, and to controller transmit normal power module adjusted and control bit it
Between corresponding relationship；
(4) controller realizes that the asymmetry of STATCOM is restarted using Pressure and Control strategy.
Realize the means for readjusting the corresponding relationship between normal power module and control bit in the step (3)
Are as follows: for any one phase, by the normal power module in the phase according to all power modules of phase under normal circumstances
Sequencing is successively sorted again, and the corresponding serial number of each normal power module is the control of corresponding normal power module
Position.
Realize the means packet restarted using the asymmetry of Pressure and Control strategy realization STATCOM in the step (4)
Include following steps:
1) according to the number of the number of the bypass power module of every phase and normal power module, to each normal power of every phase
The modulated triangular wave initial phase delay of module and DC voltage given value carry out readjustment calculating；
2) by each parametric distribution adjusted to each corresponding normal power module；
3) control STATCOM, which closes a floodgate, starts；
4) pulse control signal of the normal module of each correspondence is obtained according to each parameter adjusted, and according to obtained pulse
The corresponding each normal power module of control of signal is controlled, 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 calculation formula of modulated triangular wave initial phase delay in the step 1) are as follows:
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.
The calculation formula of DC voltage given value in the step 1) 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 1), 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.
Abnormality eliminating method provided by the invention passes through the artificial positioning bypass operation of abnormal power module, excludes abnormal mould
The abnormality of block readjusts the corresponding relationship between normal power module and control bit, finally carries out asymmetry and restarts
Control, STATCOM restarts to greatest extent after realizing failure, solve existing STATCOM power module bypass mode and
Reliability existing for abnormality eliminating method, applicability problem, the reliability of this method have obtained greatly being promoted, and are applicable in model
Enclose it is big, without reducing capacity operation, idle and harmonic compensation effect is good.
Moreover, the STATCOM that this method is suitable for none-disk terminal mechanism artificially bypasses abnormal mould when there is abnormal module
Block, is then artificially arranged the position of power unit by-pass into controller, and controller readjusts normal module according to this position
Corresponding relationship between control bit, last controller restart control according to the corresponding relationship assert again to carry out asymmetry
System.So this method can simply solve the problems, such as restarting after the STATCOM power module exception of none-disk terminal mechanism, guarantee
Before factory repair, emergency processing is carried out to STATCOM, makes STATCOM continue to administer power quality problem, to greatest extent
The compensating action of STATCOM is played.
Meanwhile the abnormality eliminating method is suitable for the positioning bypass of any power module realized by bypass instruction, with
And restart control.In addition, the abnormality eliminating method is not only applicable to the chain type STATCOM of the Y type mode of connection, and fit simultaneously
For the STATCOM of the △ type mode of connection, the scope of application is wider.
Detailed description of the invention
Fig. 1 is STATCOM power module abnormality eliminating method overall flow figure；
Fig. 2 is STATCOM power module abnormality eliminating method detail flowchart；
Fig. 3 is structural schematic diagram of the power module when operating normally；
Fig. 4 is connected mode schematic diagram of the power module in bypass；
Fig. 5 is the structural schematic diagram of the link by abnormal power module and normal power module composition；
The correspondence diagram of module and control bit when Fig. 6-a is no abnormal power module；
Fig. 6-b is the correspondence diagram of the module and control bit when having abnormal power module；
Fig. 7 is control parameter adjustment process schematic；
Wherein, in Fig. 6-b, black box represents abnormal power module, and control bit does not distribute, and white box represents just
Normal power module controls bit allocation.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
In the present embodiment, STATCOM is by taking more common chain type STATCOM as an example.STATCOM is mating to be provided with a master
Controller, the master controller are connect with STATCOM, for controlling the operation of STATCOM, so, STATCOM power module is not
Symmetrical resumption control method can be set in the host controller, realize as the control program of the controller to STATCOM
Control, since the master controller is the prior art, the particular content about the controller is just not described in detail.In addition, such as
Fruit STATCOM does not have matched master controller, but is controlled using the control system of entire electric system, then, it is asymmetric
Resumption control method 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 abnormality eliminating method the following steps are included:
The state that step 1:STATCOM master controller real-time detection STATCOM three phase power module returns, it is different when detecting
When normal state, show there is abnormal power module or referred to as fault power module in the power module in STATCOM, then,
Connection between artificial control STATCOM and bus, i.e. company between bus in primary circuit and high pressure of disconnection STATCOM
It connects, STATCOM is made to be in power-off shutdown status.Also, it in order to ensure the safety of STATCOM after a shutdown, is disconnecting
Later, the primary circuit ground connection of STATCOM, and the electric discharge of STATCOM DC voltage is waited to complete, it is ensured that safety.STATCOM stops
Work lays the foundation for subsequent abnormality processing.
Step 2: artificially bypassing abnormal power module.As shown in figure 3, power module includes core 1 and primary
Circuit input connector 2 and output connector 3, are reserved with connecting pin 4 at input connector 2, reserve at output connector 3
There is connecting pin 5.When the power module is abnormal power module, for example there is failure, then, connecting pin 4 and connecting pin 5 it
Between using equality circuit amount operation conductor 6 be shorted, as shown in figure 4, usually short circuit conductor 6 be conducting wire or busbar.
After short circuit, the bypass condition of current corresponding opposite position should be also set into the master controller of chain type STATCOM,
The position of each bypass power module in every phase is uploaded to master controller.In the present embodiment, such as can be logical using host computer
It crosses communication modes setting corresponding position bypass condition or the defeated of switching value is carried out to corresponding bypass position by soft pressing plate mode
Enter to realize the setting of bypass condition.Regardless of which kind of mode used, purpose is that master controller is made to know each abnormal power mould
Subsequent control is convenient in the position of block.As shown in figure 5, it is abnormal power module and normal power module in STATCOM
Structural relation figure.
Step 3: the number when the abnormal power module in phase every in three-phase can be obtained according to above-mentioned steps, then sentenced
Whether disconnected STATCOM meets redundancy running condition, that is, judges whether the STATCOM can be with redundancy running.
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.
Step 4: when meeting above-mentioned redundancy running condition, readjusting pair of normal power module and control bit in every phase
It should be related to, and transmit corresponding relationship adjusted into master controller.
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. 6-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 6-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 5: master controller according to the corresponding relationship of normal power module adjusted and control bit and use it is voltage-controlled
System strategy realizes that the asymmetry of STATCOM is restarted.
The present embodiment provides a kind of specific control process.
(1) according to the number of the number of the bypass power module of every phase and normal power module, to the normal power of every phase
The modulated triangular wave initial phase delay of module and DC voltage given value are readjusted, and each normal power module is obtained
The initial phase of corresponding triangular wave is delayed and each power module DC voltage given value.Furthermore it is also possible to solve side
The DC voltage average value of each phase behind road, can be used for closed-loop control.As Fig. 7 gives a kind of sequencing of adjustment, but
It is that this is one such embodiment, it should be noted that the initial phase delay of triangular wave and each power module are straight
Galvanic electricity presses given value, and there is no sequencings.
It is specific as follows:
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；
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.
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.
(2) above-mentioned steps adjust control parameter, and the initial phase of the triangular wave after being adjusted is delayed, is each
Power module DC voltage given value, every phase DC voltage average value, these adjusted values are as phase shift carrier modulation, direct current stagnation pressure
The compensating instruction of the corresponding control bit of control and Pressure and Control, the distribution of compensating instruction should be corresponding according to normal power module
Control bit number carries out matching distribution to the normal power module of correspondence.
(3) master controller of STATCOM ignores the power accordingly bypassed according to externally input power module bypass condition
The abnormality that module returns, to shield to its abnormality, abnormality is considered as having excluded, and can be considered as at this time
STATCOM is normal condition, and main controller controls STATCOM, which closes a floodgate, to be started.
(4) driving pulse of corresponding normal power module is readjusted according to the parameters adjusted of above-mentioned acquisition
Then signal controls each normal power module according to obtained drive pulse signal is corresponding, realizes the asymmetry of chain type STATCOM
Restart.
Due to the number N of three-phase normal power modulea、Nb、NcAt a time there may be equal or unequal situation,
The delay of triangular wave initial phase, the DC voltage that three-phase normal power module can be obtained by above-mentioned several formula are given and straight
Flow average voltage.Wherein work as Na、Nb、NcWhen not all equal, the triangular wave initial phase delay of three-phase, DC voltage are given and straight
It is also unequal to flow average voltage, chain type STATCOM is in asymmetry and restarts state at this time；When Na, Nb, Nc are equal, it is
One special case of the method, three-phase triangular wave initial phase delay and DC voltage give it is equal, at this time at chain type STATCOM
In symmetrically restarting state, method provided by the invention is applied equally in the case of this kind.And chain type STATCOM is appointed
The power module by-pass method of what form, as long as can realize the contraposition bypass and bypass condition of power module by bypass instruction
Back to this bypass mode of master controller, chain type STATCOM power module abnormality processing side provided by the invention can be used
Method.
It is above-mentioned to complete positioning bypass and the asymmetric work restarted, when the state that master controller detection module returns
It when without new exception, can skip above-mentioned all steps in later calculating process, directly utilize parameter adjusted, use
The asymmetry that original pressure equalizing control method carries out STATCOM restarts control.When detecting that module returns to new exception again,
The abnormality eliminating method is re-started to be controlled again.
By above step, it can be achieved that the abnormality processing of chain type STATCOM power module, the chain type after failure can be made
STATCOM has restarts ability to greatest extent, solves existing for existing chain type STATCOM power module abnormality eliminating method
Reliability, applicability problem.The STATCOM that this method is suitable for none-disk terminal mechanism is artificially bypassed different when there is abnormal module
Norm block, is then artificially arranged the position of power unit by-pass into controller, and controller is readjusted normal according to this position
Corresponding relationship between module and control bit, last controller are restarted according to the corresponding relationship assert again to carry out asymmetry
Control.So this method can simply solve the problems, such as restarting after the STATCOM power module exception of none-disk terminal mechanism, guarantee
Before factory repair, STATCOM is made to continue to administer power quality problem, has played the compensation of STATCOM to greatest extent
Effect.
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 (5)
1. a kind of STATCOM power module abnormality eliminating method, 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, it disconnects
Connection between STATCOM and bus, and STATCOM ground connection is controlled, realize the electric discharge of STATCOM DC voltage；
(2) each abnormal power module is shorted to realize bypass using conductor, and each abnormal power mould is set to controller
The corresponding position of block；
(3) judge whether STATCOM meets redundancy running condition, when meeting the redundancy running condition, readjust normal function
Corresponding relationship between rate module and control bit, and transmitted between normal power module adjusted and control bit to controller
Corresponding relationship；
(4) controller realizes that the asymmetry of STATCOM is restarted using Pressure and Control strategy；
Restarting after STATCOM power module exception of the abnormality eliminating method suitable for solving the problems, such as none-disk terminal mechanism；
The calculation formula of modulated triangular wave initial phase delay in the step 1) are as follows:
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；
In the step 1), 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.
2. STATCOM power module abnormality eliminating method according to claim 1, which is characterized in that realize the step
(3) means for readjusting the corresponding relationship between normal power module and control bit in are as follows: for any one phase, by the phase
In the sequencings of all power modules of the normal power module according to the phase under normal circumstances successively arranged again
Sequence, the corresponding serial number of each normal power module are the control bit of corresponding normal power module.
3. STATCOM power module abnormality eliminating method according to claim 1, which is characterized in that realize the step
(4) in using Pressure and Control strategy realize STATCOM the means restarted of asymmetry the following steps are included:
1) according to the number of the number of the bypass power module of every phase and normal power module, to each normal power module of every phase
Modulated triangular wave initial phase delay and DC voltage given value carry out readjustment calculating；
2) by each parametric distribution adjusted to each corresponding normal power module；
3) control STATCOM, which closes a floodgate, starts；
4) pulse control signal of the normal module of each correspondence is obtained according to each parameter adjusted, and according to obtained pulse control
Signal is corresponding to control each normal power module, realizes that asymmetry is restarted.
4. STATCOM power module abnormality eliminating method according to claim 1, which is characterized in that the redundancy running
Condition are as follows: for any one phase, when the sum of the number of power module that the number of the abnormal power module of the phase has been bypassed with the phase
Less than or equal to the number of the mutually spare power module.
5. STATCOM power module abnormality eliminating method according to claim 3, which is characterized in that in the step 1)
DC voltage given value calculation formula 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.
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| CN117595686B (en) * | 2024-01-18 | 2024-04-12 | 西南交通大学 | Single-phase PET modulation method suitable for load open circuit in module |
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