CN206004310U - A kind of alternating current filter fling-cut system - Google Patents
A kind of alternating current filter fling-cut system Download PDFInfo
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- CN206004310U CN206004310U CN201621018126.2U CN201621018126U CN206004310U CN 206004310 U CN206004310 U CN 206004310U CN 201621018126 U CN201621018126 U CN 201621018126U CN 206004310 U CN206004310 U CN 206004310U
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Abstract
This utility model discloses a kind of alternating current filter fling-cut system, it is related to power quality control technology field, the computational engineering for solving the problems, such as alternating current filter switching mode presence in HVDC transmission system is big, switching list data occupancy memory space is big and the various methods of operation that are cannot flexibly corresponding to DC transmission system.This alternating current filter fling-cut system includes：For judging initial aberration rate index and target aberration rate index whether standard compliant aberration rate index judgment means；For selecting simulation to put into the alternating current filter selecting device of the alternating current filter in HVDC transmission system；Alternating current filter switching instruction device for the actual switching operation of the selection result instruction alternating current filter of the judged result according to aberration rate index judgment means and alternating current filter selecting device.The alternating current filter fling-cut system that this utility model provides is used for switching alternating current filter in HVDC transmission system.
Description
Technical field
This utility model is related to power quality control technology field, more particularly, to a kind of alternating current filter fling-cut system.
Background technology
At present, remote distance power transmission mainly adopts high voltage dc transmission technology, and this technology passes through conventional high-tension mostly
DC transmission system is realizing, and conventional high-tension DC transmission system, during the inverter change of current, can produce substantial amounts of humorous
Ripple, impact AC electric power systems being produced in order to avoid harmonic wave, preferably improve the quality of the electric energy of transmission, typically can be in height
Press wave filter of increasing exchanges at the ac bus of DC converter station in DC transmission system；And, the alternating current filter of increase is also
To compensate required reactive power during the current conversion station change of current simultaneously as reactive power compensation device.Due to above-mentioned D.C. high voltage transmission
System during practical application, with the lifting of power, all can send out by the size of its harmonic current and the demand of reactive power
Changing, accordingly, it would be desirable to carry out switching operation according to the change of its power to alternating current filter, to meet DC transmission system
Normal operation needs.
In prior art, for the DC transmission system having put into operation, the switching operation of alternating current filter is all using under line
Calculate, the mode of switching that line is tabled look-up, that is, need to adjust the switching combination of alternating current filter under different capacity level under line, whole
Manage out switching list under different operating modes, different capacity level for the alternating current filter, and actual carry out switching operation when, control
Tabled look-up in processing procedure sequence, carried out switching according to switching list combination.The switching mode of existing this alternating current filter is not only
Carry out substantial amounts of operating mode under needing online and (include in different running method, the work such as different combinations of voltages and different capacity level
Condition) to adjust, computational engineering is larger, and substantial amounts of data form can take a large amount of storages of control program in DC transmission system
Space.Additionally, being filtered device switching by way of tabling look-up, the combination of the switching of wave filter excessively fixing it is impossible to flexibly right
Answer the various methods of operation of DC transmission system.
Utility model content
The purpose of this utility model is to provide a kind of alternating current filter fling-cut system, for solving D.C. high voltage transmission system
It is big and cannot spirit that the computational engineering that in system, alternating current filter switching mode exists is big, switching list data takies memory space
The problem of the various methods of operation of corresponding DC transmission system lived.
To achieve these goals, this utility model provides following technical scheme：
A kind of alternating current filter fling-cut system, including：
Each initial harmonic current being connected with the ac bus of DC converter station in HVDC transmission system obtains dress
Put, described each time initial harmonic current acquisition device is used for being provided only with initial alternating current filter in HVDC transmission system
When, obtain each initial harmonic current flowing into initial alternating current filter, and each initial commutation becomes side harmonics electric current；
The wave filter total impedance acquisition device being connected with the initial alternating current filter of input in HVDC transmission system,
Described wave filter total impedance acquisition device is used for obtaining each initial total impedance of initial alternating current filter；
It is connected with described each time initial harmonic current acquisition device, and be connected with described wave filter total impedance acquisition device
Initial aberration rate index selection device, described initial aberration rate index selection device is used for according to described each time initial harmonic current
With described each time initial total impedance, obtain the initial aberration rate index at ac bus；
The aberration rate index judgment means being connected with described initial aberration rate index selection device, described aberration rate index is sentenced
Whether disconnected device is used for judging described initial aberration rate index less than default warning value；
It is connected with described aberration rate index judgment means, and the alternating current filter being connected with described ac bus selects dress
Put, described alternating current filter selecting device is also connected with described wave filter total impedance acquisition device；When described initial aberration rate refers to
When mark is not less than default warning value, described alternating current filter selecting device will be simulated for selection and put into described high-voltage dc transmission
Alternating current filter in electric system；Described wave filter total impedance acquisition device is additionally operable to obtain to HVDC transmission system middle mold
After intending putting into alternating current filter, the corresponding each target total impedance of whole alternating current filters of input；
It is connected with described each time initial harmonic current acquisition device, and be connected with described wave filter total impedance acquisition device
Target aberration rate index selection device, described target aberration rate index selection device also with described aberration rate index judgment means phase
Even, described target aberration rate index selection device is used for being become according to described each time initial harmonic current, described each initial commutation
Side harmonics electric current, described each time initial total impedance, and described each target total impedance, obtain to described D.C. high voltage transmission
Each target harmonic voltage at described ac bus after simulation input alternating current filter in system, further according to described each target
Harmonic voltage obtains target aberration rate index；Described aberration rate index judgment means are additionally operable to judge described target aberration rate index
Whether less than default warning value；If not, described alternating current filter selecting device is additionally operable to select and simulates the friendship putting into
The alternating current filter that differs of species of stream wave filter, and simulated and put in described HVDC transmission system；
It is connected with described aberration rate index judgment means, and the ac filter being connected with described alternating current filter selecting device
Device switching instruction device, when described target aberration rate index is less than default warning value, described alternating current filter switching instruction dress
Put for indicating that input is corresponding with the described target aberration rate index being less than default warning value in HVDC transmission system
Alternating current filter.
In the alternating current filter fling-cut system that this utility model provides, each time initial harmonic current acquisition device is obtained in that
Flow into each initial harmonic current of initial alternating current filter, and each initial commutation becomes side harmonics electric current；Initial aberration rate
Index selection device can in conjunction with each initial total impedance of each initial harmonic current and initial alternating current filter, obtain not to
When in HVDC transmission system, simulation puts into alternating current filter, the initial aberration rate index at ac bus；Aberration rate index
Initial aberration rate index and default warning value can be compared by judgment means, and determine the need for D.C. high voltage transmission
In system, simulation puts into alternating current filter；When in needing to HVDC transmission system, simulation puts into alternating current filter, exchange
Wave filter selecting device can select an alternating current filter, and simulated and put in HVDC transmission system, and simulation is thrown
After entering, target aberration rate index selection device is obtained in that simulation is handed over after putting into alternating current filter in HVDC transmission system
Target aberration rate index at stream bus, aberration rate index judgment means can judge to target aberration rate index again,
When target aberration rate index is less than default warning value, alternating current filter switching instruction device can indicate that to D.C. high voltage transmission
Put in system and the corresponding alternating current filter of target aberration rate index less than default warning value.When target aberration rate index is big
In or when being equal to default warning value, alternating current filter selecting device can select with the species of the alternating current filter having put into not
The simulation of identical alternating current filter is put in HVDC transmission system, and regains target aberration rate index, until obtaining
Till must be less than the target aberration rate index of default warning value, put into D.C. high voltage transmission by meeting the alternating current filter requiring
In system.
Therefore, the alternating current filter fling-cut system that this utility model provides does not need analysis to exchange under various power levels
The switching combination of wave filter, and do not need to generate corresponding alternating current filter switching list data, avoid existing skill well
The problems such as computational engineering that in art, alternating current filter switching mode exists is big, switching list data occupancy memory space is big.Additionally,
The alternating current filter fling-cut system that this utility model provides can be directed to the method for operation of current DC transmission system, and it is suitable to select
Alternating current filter carry out switching so that the switching operation of alternating current filter has more motility.
Brief description
Accompanying drawing described herein is used for providing further understanding to of the present utility model, constitutes one of the present utility model
Point, schematic description and description of the present utility model is used for explaining this utility model, does not constitute to of the present utility model
Improper restriction.In the accompanying drawings：
The structural representation of the alternating current filter fling-cut system that Fig. 1 provides for this utility model embodiment；
The workflow diagram of the alternating current filter fling-cut system that Fig. 2 provides for this utility model embodiment.
Reference：
11- first current transformer, 12- second current transformer,
13- vector arithmetic unit, 14- current resolver,
20- wave filter total impedance acquisition device, 30- initial aberration rate index selection device,
40- ac bus, 50- target aberration rate index selection device,
60- aberration rate index judgment means, 70- alternating current filter selecting device,
Big group of chopper of 71-, 72- group chopper,
73- alternating current filter, 80- alternating current filter switching instruction device.
Specific embodiment
In order to further illustrate the alternating current filter fling-cut system of this utility model embodiment offer, with reference to description
Accompanying drawing is described in detail.
Refer to Fig. 1, the alternating current filter fling-cut system that this utility model embodiment provides includes：
Each initial harmonic current being connected with the ac bus 40 of DC converter station in HVDC transmission system is obtained
Device, each initial harmonic current acquisition device is used for being provided only with initial alternating current filter in HVDC transmission system
When, obtain each initial harmonic current flowing into initial alternating current filter, and each initial commutation becomes side harmonics electric current；Need
Illustrate, above-mentioned initial alternating current filter refers to the operation in order to meet HVDC transmission system, in D.C. high voltage transmission
The initial alternating current filter of setting in system, rather than put into by alternating current filter fling-cut system.Above-mentioned inflow is initially handed over
Each initial harmonic current of stream wave filter, the initial alternating current filter referring to flow into setting in HVDC transmission system is whole
The initial harmonic current of each time of body.Optionally, above-mentioned HVDC transmission system include by DC line connect two ends or
Inverters more than two ends, but it is not limited only to this HVDC transmission system.
The wave filter total impedance acquisition device being connected with the initial alternating current filter of input in HVDC transmission system
20, wave filter total impedance acquisition device 20 is used for obtaining each initial total impedance of initial alternating current filter；Above-mentioned each time initial
Total impedance refers to each initial total impedance of whole initial alternating current filters that arrange, and (operating frequency of initial alternating current filter is not
With its each time corresponding initial harmonic impedance is different).
It is connected with each initial harmonic current acquisition device, and initially abnormal with what wave filter total impedance acquisition device 20 was connected
Variability index selection device 30, initial aberration rate index selection device 30 is used for initial according to each initial harmonic current and each time
Total impedance, obtains the initial aberration rate index at ac bus 40.
The aberration rate index judgment means 60 being connected with initial aberration rate index selection device 30, aberration rate index judges dress
Put 60 to be used for judging initial aberration rate index whether less than default warning value.
It is connected with aberration rate index judgment means 60, and the alternating current filter selecting device 70 being connected with ac bus 40,
Alternating current filter selecting device 70 is also connected with wave filter total impedance acquisition device 20；When initial aberration rate index is not less than (greatly
In or be equal to) preset warning value when, alternating current filter selecting device 70 will be simulated for selection and put into D.C. high voltage transmission system
Alternating current filter 73 in system；Wave filter total impedance acquisition device 20 is additionally operable to obtain the simulation throwing in HVDC transmission system
After entering alternating current filter 73, whole alternating current filters 73 of input (include the initial alternating current filter of setting and simulate input
Alternating current filter 73) corresponding each target total impedance.
It is connected with each initial harmonic current acquisition device, and the target being connected with wave filter total impedance acquisition device 20 is abnormal
Variability index selection device 50, target aberration rate index selection device 50 is also connected with aberration rate index judgment means 60, target
Aberration rate index selection device 50 be used for according to each initial harmonic current, each initial commutation change side harmonics electric current, each time
Initial total impedance, and each target total impedance, after obtaining the simulation input alternating current filter 73 in HVDC transmission system
Each target harmonic voltage at ac bus 40, obtains target aberration rate index further according to each target harmonic voltage；Distortion
Whether rate index judgment means 60 are additionally operable to judge target aberration rate index less than default warning value；If not, alternating current filter
The alternating current filter 73 that the species that selecting device 70 is additionally operable to select with simulate the alternating current filter 73 putting into differs, and
Simulated and put in HVDC transmission system；Target aberration rate index selection device 50 is used for obtaining corresponding mesh again
Mark aberration rate index, aberration rate index judgment means 60 are additionally operable to judge corresponding target aberration rate index again, until simulation
Put into till the corresponding target aberration rate index of alternating current filter 73 in HVDC transmission system is less than default warning value.
It is connected with aberration rate index judgment means 60, and the alternating current filter being connected with alternating current filter selecting device 70 is thrown
Cut instruction device 80, when target aberration rate index is less than default warning value, alternating current filter switching instruction device 80 is used for referring to
Show the corresponding alternating current filter 73 of target aberration rate index putting into in HVDC transmission system with less than default warning value.
It should be noted that referring to the corresponding alternating current filter 73 of target aberration rate index less than default warning value：By exchange filter
After ripple device 73 simulation is put in HVDC transmission system, the impedance of the alternating current filter 73 being put into according to simulation is needed to obtain
Corresponding target aberration rate index, therefore, each target aberration rate index of acquisition all corresponds to an alternating current filter 73.
The work process of above-mentioned alternating current filter fling-cut system is：Only it is provided with initial friendship in HVDC transmission system
During stream wave filter, each time initial harmonic current acquisition device obtains each initial harmonic current flowing into initial alternating current filter,
Become side harmonics electric current with each initial commutation；Initial aberration rate index selection device 30 according to each initial harmonic current, and
It is arranged on each initial total impedance of the initial alternating current filter in HVDC transmission system, obtain first at ac bus 40
Beginning aberration rate index；Whether aberration rate index judgment means 60 judge initial aberration rate index less than default warning value, if being less than,
Then each initial harmonic current acquisition device and initial aberration rate index selection device 30 match and regain subsequent time friendship
Initial aberration rate index at stream bus 40, aberration rate index judgment means 60 are carried out to the initial aberration rate index regaining
Judge；If being more than, alternating current filter selecting device 70 selects to simulate the exchange filter putting in HVDC transmission system
Ripple device 73；After alternating current filter 73 simulation is put in HVDC transmission system, wave filter total impedance acquisition device 20 obtains
After in orientation HVDC transmission system, simulation puts into alternating current filter 73, whole exchanges of input in HVDC transmission system
The corresponding each target total impedance of wave filter 73；Target aberration rate index selection device 50 is according to each initial harmonic current, each
Secondary initial commutation becomes side harmonics electric current, each initial total impedance, and each target total impedance, obtains to D.C. high voltage transmission
In system, simulation puts into each target harmonic voltage after alternating current filter 73 at ac bus 40, and target aberration rate index obtains
Take device 50 always according to each target harmonic voltage, obtain the target aberration rate index at ac bus 40.
Whether aberration rate index judgment means 60 judge target aberration rate index less than default warning value, when target aberration rate
When index is less than default warning value, alternating current filter switching instruction device 80 indicate put into in HVDC transmission system with little
The corresponding alternating current filter 73 of target aberration rate index in default first warning value；When target aberration rate index is more than or equal to
During default warning value, alternating current filter selecting device 70 can reselect different from simulating the alternating current filter 73 putting into
The alternating current filter 73 of species, simulation again is put in HVDC transmission system, and reacquires target aberration rate index,
And rejudge target aberration rate index, till target aberration rate index is less than default warning value.
Structure according to above-mentioned alternating current filter fling-cut system and work process, this utility model embodiment provides
In alternating current filter fling-cut system, each initial harmonic current acquisition device is obtained in that and flows into each time of initial alternating current filter
Initial harmonic current, and each initial commutation change side harmonics electric current；Initial aberration rate index selection device 30 can be in conjunction with each
Secondary initial harmonic current and each initial total impedance of initial alternating current filter, obtain and do not simulate in HVDC transmission system
When putting into alternating current filter 73, the initial aberration rate index at ac bus 40；Aberration rate index judgment means 60 can be by just
Beginning aberration rate index and default warning value are compared, and determine the need for the simulation input friendship in HVDC transmission system
Stream wave filter 73；When in needing to HVDC transmission system, simulation puts into alternating current filter 73, alternating current filter selects dress
Put 70 and can select an alternating current filter 73, and simulated and put in HVDC transmission system, after simulation puts into, target
Aberration rate index selection device 50 is obtained in that simulation puts into exchange mother after alternating current filter 73 in HVDC transmission system
Target aberration rate index at line 40, aberration rate index judgment means 60 can judge to target aberration rate index again,
When target aberration rate index is less than default warning value, alternating current filter switching instruction device 80 can indicate that to high-voltage dc transmission
Put in electric system and the corresponding alternating current filter 73 of target aberration rate index less than default warning value.When target aberration rate refers to
When mark is more than or equal to default warning value, alternating current filter selecting device 70 can select and the alternating current filter 73 putting into
Alternating current filter 73 simulation that differs of species put in HVDC transmission system, and regain target aberration rate and refer to
Mark, till obtaining the target aberration rate index less than default warning value, puts into meeting the alternating current filter 73 requiring
In HVDC transmission system.
Therefore, the alternating current filter fling-cut system that this utility model embodiment provides does not need analysis in various power levels
The switching combination of lower alternating current filter 73, and do not need to generate corresponding alternating current filter 73 switching list data, keep away well
Exempt from the computational engineering that in prior art, alternating current filter switching mode exists is big, switching list data occupancy memory space is big etc.
Problem.Additionally, the alternating current filter fling-cut system that this utility model provides can be directed to the operation side of current DC transmission system
Formula, selects suitable alternating current filter 73 to carry out switching so that the switching operation of alternating current filter 73 has more motility.
It should be noted that above-mentioned initial aberration rate index, target aberration rate index and default warning value can be according to height
To set, (aberration rate index meets the requirement less than default warning value to pressure DC transmission system actual motion needs, ensure that
HVDC transmission system safely and steadily runs)；Optionally, initial aberration rate index includes three initial harmonic voltage distortion
Rate, five initial harmonic voltage distortion rates, the maximum initial harmonic voltage distortion rate of even-times, the maximum initial harmonic voltages of odd-times
6 indexs such as the initial percent harmonic distortion of aberration rate, total voltage and initial telephonic harmonic wave forms coefficient；Target aberration rate index includes
Three target harmonic voltage distortion rates, five target harmonic voltage distortion rates, even-times maximum target harmonic voltage distortion rate, strange
6 fingers such as maximum target harmonic voltage distortion rate, total voltage target percent harmonic distortion and target phone harmonic wave forms coefficient for several times
Mark；Default warning value includes three default harmonic voltage distortion rates, five default harmonic voltage distortion rates, even-times maximum preset
Harmonic voltage distortion rate, odd-times maximum preset harmonic voltage distortion rate, total voltage preset percent harmonic distortion and predetermined telephone is humorous
Waveform coefficient.
When whether judging initial aberration rate index and target aberration rate index less than default warning value, three initial harmonic waves
Voltage distortion rate and three target harmonic voltage distortion rates all correspond to compared with three default harmonic voltage distortion rates；At the beginning of five times
Beginning harmonic voltage distortion rate all corresponds to compared with five default harmonic voltage distortion rates with five target harmonic voltage distortion rates；
The maximum initial harmonic voltage distortion rate of even-times and even-times maximum target harmonic voltage distortion rate are all corresponding maximum with even-times
Default harmonic voltage distortion rate compares；The maximum initial harmonic voltage distortion rate of odd-times and odd-times maximum target harmonic voltage
Aberration rate all corresponds to compared with odd-times maximum preset harmonic voltage distortion rate；The initial percent harmonic distortion of total voltage and total voltage
Target percent harmonic distortion all corresponds to compared with percent harmonic distortion default with total voltage；Initial telephonic harmonic wave forms coefficient and target electricity
Words harmonic wave forms coefficient all corresponds to compared with predetermined telephone harmonic wave forms coefficient.It should be noted that above-mentioned initial aberration rate
In corresponding 6 indexs of index and corresponding 6 indexs of target aberration rate index, as long as there being an index to be unsatisfactory for less than correspondence
Default warning value, then alternating current filter selecting device 70 be accomplished by selecting suitable alternating current filter 73 simulation to put into high pressure
In DC transmission system.
The concrete calculation of above-mentioned initial aberration rate index and target aberration rate index is as follows：
The computing formula of third harmonic voltage aberration rate is：
Wherein, D3For third harmonic voltage aberration rate, U1For fundamental voltage, U3For third harmonic voltage, and U3Meet：
U3=I3×R3Formula two
Wherein, I3For triple harmonic current, R3For three total impedances.
The computing formula of quintuple harmonics voltage distortion rate is：
Wherein, D5For quintuple harmonics voltage distortion rate, U5For quintuple harmonics voltage, and U5Meet：
U5=I5×R5Formula four
Wherein, I5For quintuple harmonics electric current, R5For five total impedances.
Odd-times maximum harmonic voltage distortion rate computing formula be：
Wherein, DoddmaxFor odd-times maximum harmonic voltage distortion rate, UoddmaxFor odd-times maximum harmonic voltage, and
UoddmaxMeet：
Uoddmax=max (Iodd×Rodd) formula six
Wherein, IoddFor odd harmonics electric current, RoddFor odd-times total impedance.
Even-times maximum harmonic voltage distortion rate computing formula be：
Wherein, DevemaxFor even-times maximum harmonic voltage distortion rate, UevemaxFor even-times maximum harmonic voltage, and
UevemaxMeet：
Uevemax=max (Ieve×Reve) formula eight
Wherein, IeveFor even harmonics electric current, ReveFor even-times total impedance.
Total voltage percent harmonic distortion computing formula is：
Wherein, DeffFor total voltage percent harmonic distortion, DnFor nth harmonic voltage distortion rate.
Phone harmonic wave forms coefficient formulas are：
Wherein, THFF is phone harmonic wave forms coefficient, UnFor nth harmonic voltage, Fn=pnnf0/ 800, wherein pnFor audition
Weight coefficient, this coefficient can be found in relevant criterion；N is overtone order, f0For electrical network fundamental frequency.U has for line-to-earth voltage
Valid value, can be calculated by following formula：
UnMeet：
Un=In×RnFormula 12
Wherein, InFor nth harmonic electric current, RnFor n total impedance.
In the initial aberration rate index of corresponding calculating, only the harmonic voltage in formula one to formula 12 need to be substituted for phase
The initial harmonic voltage answered, harmonic current is substituted for initial harmonic current accordingly, and total impedance is substituted for and initially always hinders accordingly
Anti-, in corresponding calculating target aberration rate index, only the harmonic voltage in formula one to formula 12 need to be substituted for phase
The target harmonic voltage answered, harmonic current is substituted for corresponding target harmonic current, and total impedance is substituted for corresponding target and always hinders
Anti-.
The practical structures of above-mentioned each time initial harmonic current acquisition device are varied, and each initial harmonic wave electricity is given below
A kind of concrete structure of stream acquisition device, and the work process of each initial harmonic current acquisition device is described in detail.
Above-mentioned each time initial harmonic current acquisition device includes：
The first current transformer 11 that the ac bus 40 becoming net side with the change of current are connected, the first current transformer 11 is used for surveying
The amount change of current becomes the electric current at the ac bus 40 of net side, and obtains change of current change current on line side.
The second current transformer 12 being connected with the ac bus 40 of alternating current inlet wire side, the second current transformer 12 is used for surveying
Electric current at the ac bus 40 of amount alternating current inlet wire side, and obtain alternating current inlet wire electric current.
It is connected with the first current transformer 11, and the vector arithmetic unit 13 being connected with the second current transformer 12, vector fortune
Calculate device 13 to be used for obtaining the phasor difference that the change of current becomes current on line side and alternating current inlet wire electric current.
It is connected with the first current transformer 11, and the current resolver 14 being connected with vector arithmetic unit 13, current resolver
14 are also connected with initial aberration rate index selection device 30, are also connected with target aberration rate index selection device 50, Current Decomposition
Device 14 is used for becoming the phasor difference of current on line side and alternating current inlet wire electric current according to the change of current, obtains flow into initial alternating current filter each time
Initial harmonic current；Current resolver 14 is additionally operable to become current on line side according to the change of current, obtains each initial commutation and becomes side harmonics
Electric current.Specifically, current resolver 14 obtains each initial harmonic current by Fourier decomposition and each initial commutation becomes net
Side harmonic current.
Please continue to refer to Fig. 1, there are various structures, optionally, alternating current filter in above-mentioned alternating current filter selecting device 70
Selecting device 70 includes：Big group of chopper 71 of at least one being connected with ac bus 40；Each big group of chopper 71 is corresponding
The some groups chopper 72 connecting；The some alternating current filters 73 connecting one to one with some groups chopper 72, some
Alternating current filter 73 includes at least two class alternating current filters 73.Alternating current filter selecting device 70 is in actual selection alternating current filter
When 73, can first select big group chopper 71, and be closed；Then select to break with the corresponding group of big group of chopper 71 of closure
Road device 72, and closed, make to put into HVDC with group's chopper 72 corresponding alternating current filter 73 simulation closing
In transmission system.
The species of above-mentioned some alternating current filters 73 is chosen as three tuning alternating current filters, double tunning alternating current filter, c-type
Alternating current filter and shunt capacitance type alternating current filter etc.；The wherein optional DT11/24 of double tunning alternating current filter, DT13/36,
DT11/13 and DT24/36 etc., optional HP3 and HP5 of c-type alternating current filter etc..It is of course also possible to select switching other kinds of
Alternating current filter 73, be not limited only to above-mentioned be given several.
Refer to Fig. 2, the work process of above-mentioned alternating current filter fling-cut system comprises the following steps：
Step 101, when being provided only with initial alternating current filter in HVDC transmission system, obtains and flows into initial exchange
The initial harmonic current of each time of wave filter (obtains each initial corresponding phase place of harmonic current) simultaneously, and each initial commutation becomes
Side harmonics electric current；
Step 102, according to each initial harmonic current, and is arranged on the initial ac filter in HVDC transmission system
The initial total impedance of each time of device, obtains the initial aberration rate index at ac bus 40；
Whether step 103, judge initial aberration rate index less than default warning value, if it is, return to step 101；As
Really no, then execution step 104；
Step 104, the simulation in HVDC transmission system puts into an alternating current filter 73, and obtains simulation input exchange
After wave filter 73, the corresponding each target total impedance of whole alternating current filters 73 of input in HVDC transmission system；According to
Each time initial harmonic current, each initial commutation become side harmonics electric current, each initial total impedance, and each target and always hinder
Anti-, obtain the simulation in HVDC transmission system and put into each target harmonic wave electricity at ac bus 40 after alternating current filter 73
Pressure, according to each target harmonic voltage, obtains the target aberration rate index at ac bus 40；
Whether step 105, judge target aberration rate index less than default warning value, if it is, execution step 106；As
Really no, then return to step 104, and in HVDC transmission system, when re-executing step 104, simulate the exchange filter of input
The species of ripple device 73, is differed with the species simulating the alternating current filter 73 putting into；
Step 106, according to the kind of the alternating current filter 73 simulating input in step 104 in HVDC transmission system
Class, carries out the actual switching operation of alternating current filter 73 to HVDC transmission system.
Above-mentioned alternating current filter fling-cut system is in the course of the work it is not necessary to analyze ac filter under various power levels
The switching combination of device 73, and do not need to generate corresponding alternating current filter 73 switching list data, avoid existing skill well
The problems such as computational engineering that in art, alternating current filter switching mode exists is big, switching list data occupancy memory space is big.Additionally,
The operation/cutting method implemented by above-mentioned alternating current filter fling-cut system can be directed to the method for operation of current DC transmission system, selects
Suitable alternating current filter 73 carries out switching so that the switching operation of alternating current filter 73 has more motility.Using above-mentioned exchange
The switching that wave filter fling-cut system implements alternating current filter 73 is stated while effect in realization additionally it is possible to realize to HVDC
The real-time judge of the aberration rate index in transmission system, preferably ensure that HVDC transmission system is operated in stable state
Under.
In above-mentioned steps 101, the change of current is measured by the first current transformer 11 and becomes the electricity at the ac bus 40 of net side
Stream, and obtain change of current change current on line side；
Electric current at the ac bus 40 of alternating current inlet wire side is measured by the second current transformer 12, and obtains alternating current inlet wire
Electric current；
The phasor difference that the change of current becomes current on line side and alternating current inlet wire electric current is obtained by vector arithmetic unit 13；
Become the phasor difference of current on line side and alternating current inlet wire electric current by current resolver 14 according to the change of current, obtain and flow into initially
The initial harmonic current of each time of alternating current filter；Also by current resolver 14, current on line side is become according to the change of current, obtain at the beginning of each time
The beginning change of current becomes side harmonics electric current.
In above-mentioned steps 104, each time target harmonic voltage is：
Wherein, Ux' it is x target harmonic voltage, I1xBecome side harmonics electric current, I for x initial commutation1x-I2xAt the beginning of x time
Beginning harmonic current, Zacf1xFor x initial total impedance, Zacf2xFor x target total impedance, x can be with value for 1～n, that is, corresponding 1 time
To n time.
To in HVDC transmission system, simulation puts into an alternating current filter 73 and comprises the following steps：Select big group chopper
71, and closed；Select the big group of chopper 71 corresponding group chopper 72 with closure, and closed, make and close
Group's chopper 72 corresponding alternating current filter 73 simulation put in HVDC transmission system.To D.C. high voltage transmission system
The species simulating the alternating current filter 73 of input in system includes：Three tuning alternating current filters, double tunning alternating current filter, c-type are handed over
Stream wave filter and shunt capacitance type alternating current filter etc..
In the description of above-mentioned embodiment, specific features, structure, material or feature can be at any one or many
Combine in an appropriate manner in individual embodiment or example.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model does not limit to
In this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in change
Or replace, all should cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with described power
The protection domain that profit requires is defined.
Claims (5)
1. a kind of alternating current filter fling-cut system is it is characterised in that include：
Each initial harmonic current acquisition device being connected with the ac bus of DC converter station in HVDC transmission system, institute
State each initial harmonic current acquisition device for, when being provided only with initial alternating current filter in HVDC transmission system, obtaining
Take each initial harmonic current flowing into initial alternating current filter, and each initial commutation becomes side harmonics electric current；
The wave filter total impedance acquisition device being connected with the initial alternating current filter of input in HVDC transmission system, described
Wave filter total impedance acquisition device is used for obtaining each initial total impedance of initial alternating current filter；
It is connected with described each time initial harmonic current acquisition device, and initial with what described wave filter total impedance acquisition device was connected
Aberration rate index selection device, described initial aberration rate index selection device is used for according to described each time initial harmonic current and institute
State each initial total impedance, obtain the initial aberration rate index at ac bus；
The aberration rate index judgment means being connected with described initial aberration rate index selection device, described aberration rate index judges dress
Put for judging described initial aberration rate index whether less than default warning value；
It is connected with described aberration rate index judgment means, and the alternating current filter selecting device being connected with described ac bus, institute
State alternating current filter selecting device to be also connected with described wave filter total impedance acquisition device；When described initial aberration rate index is not little
When default warning value, described alternating current filter selecting device will be simulated for selection and put into described HVDC transmission system
In alternating current filter；Described wave filter total impedance acquisition device is additionally operable to obtain the simulation input in HVDC transmission system
After alternating current filter, the corresponding each target total impedance of whole alternating current filters of input；
It is connected with described each time initial harmonic current acquisition device, and the target being connected with described wave filter total impedance acquisition device
Aberration rate index selection device, described target aberration rate index selection device is also connected with described aberration rate index judgment means,
Described target aberration rate index selection device is used for becoming net side according to described each time initial harmonic current, described each initial commutation
Harmonic current, described each time initial total impedance, and described each target total impedance, obtain to described HVDC transmission system
Each target harmonic voltage at described ac bus after middle simulation input alternating current filter, further according to described each target harmonic wave
Voltage obtains target aberration rate index；Described aberration rate index judgment means are additionally operable to whether judge described target aberration rate index
Less than default warning value；If not, described alternating current filter selecting device be additionally operable to select with simulate put into exchange filter
The alternating current filter that the species of ripple device differs, and simulated and put in described HVDC transmission system；
It is connected with described aberration rate index judgment means, and the alternating current filter being connected with described alternating current filter selecting device is thrown
Cut instruction device, when described target aberration rate index is less than default warning value, described alternating current filter switching instruction device is used
Put in instruction is to HVDC transmission system and the corresponding exchange of described target aberration rate index less than default warning value
Wave filter.
2. alternating current filter fling-cut system according to claim 1 is it is characterised in that described initial aberration rate index includes
Three initial harmonic voltage distortion rates, five initial harmonic voltage distortion rates, the maximum initial harmonic voltage distortion rate of even-times, strange
Maximum for several times initial harmonic voltage distortion rate, the initial percent harmonic distortion of total voltage and initial telephonic harmonic wave forms coefficient；Described mesh
Mark aberration rate index includes three target harmonic voltage distortion rates, five target harmonic voltage distortion rates, even-times maximum target
Harmonic voltage distortion rate, odd-times maximum target harmonic voltage distortion rate, total voltage target percent harmonic distortion and target phone are humorous
Waveform coefficient.
3. alternating current filter fling-cut system according to claim 1 and 2 is it is characterised in that described each time initial harmonic wave is electric
Stream acquisition device includes：
The first current transformer that the ac bus becoming net side with the change of current are connected, described first current transformer is used for measuring the change of current
Become the electric current at the ac bus of net side, and obtain the change of current and become current on line side；
The second current transformer being connected with the ac bus of alternating current inlet wire side, described second current transformer is used for measurement exchange
Enter the electric current at the ac bus of line side, and obtain alternating current inlet wire electric current；
It is connected with described first current transformer, and the vector arithmetic unit being connected with described second current transformer, described vector
It is used for arithmetical unit obtaining the phasor difference that the described change of current becomes current on line side and described alternating current inlet wire electric current；
It is connected with described first current transformer, and the current resolver being connected with described vector arithmetic unit, described Current Decomposition
Device is also connected with described initial aberration rate index selection device and described target aberration rate index selection device, described Current Decomposition
Device is used for becoming the phasor difference of current on line side and described alternating current inlet wire electric current according to the described change of current, obtains and flows into initial alternating current filter
Each initial harmonic current；Described current resolver is additionally operable to become current on line side according to the described change of current, obtains and initially changes for each time
Rheology side harmonics electric current.
4. alternating current filter fling-cut system according to claim 1 and 2 is it is characterised in that described alternating current filter selects
Device includes：
Big group of chopper of at least one being connected with described ac bus；
Each described big group of chopper corresponds to some groups chopper connecting；
The some alternating current filters connecting one to one with described some groups choppers, described some alternating current filters include to
Few two class alternating current filters.
5. alternating current filter fling-cut system according to claim 4 is it is characterised in that described some alternating current filters include
Three tuning alternating current filters, double tunning alternating current filter, c-type alternating current filter and shunt capacitance type alternating current filter.
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| CN106159952B (en) * | 2016-08-31 | 2018-08-07 | 南方电网科学研究院有限责任公司 | A kind of alternating current filter fling-cut system and operation/cutting method |
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Effective date of registration: 20210609 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Address before: 510080 West Tower 13-20 Floor, Shui Jungang 6 and 8 Dongfeng East Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |