CN106130021A - A kind of flexible tuner of T-shaped mixing - Google Patents
A kind of flexible tuner of T-shaped mixing Download PDFInfo
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- CN106130021A CN106130021A CN201610462950.5A CN201610462950A CN106130021A CN 106130021 A CN106130021 A CN 106130021A CN 201610462950 A CN201610462950 A CN 201610462950A CN 106130021 A CN106130021 A CN 106130021A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 180
- 230000005611 electricity Effects 0.000 claims abstract description 45
- 230000001052 transient effect Effects 0.000 claims abstract description 31
- 230000001939 inductive effect Effects 0.000 claims abstract description 20
- 230000001629 suppression Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000003068 static effect Effects 0.000 claims description 39
- 230000001360 synchronised effect Effects 0.000 claims description 30
- 230000007704 transition Effects 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 claims description 2
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- 230000008859 change Effects 0.000 abstract description 9
- 230000006870 function Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
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- 238000012986 modification Methods 0.000 description 3
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Classifications
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
-
- 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]
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a kind of flexible tuner of T-shaped mixing, described tuner includes STATCOM STATCOM and/or SSSC SSSC；STATCOM STATCOM parallel connection accesses the transmission line of electricity between two inductive compensation unit, and SSSC SSSC series connection accesses in the transmission line of electricity of inductive compensation unit side.Compared with prior art, the one flexible tuner of T-shaped mixing that the present invention provides, can flexible export, to adapt to the change of the structure of transmission line of electricity, parameter and the method for operation, guarantee that transmission line of electricity presents the characteristic of half-wave power transmission system, the most also can possess the functions such as power factor compensation, flexible cutting-in control, transient overvoltage suppression and steady state voltage control.
Description
Technical field
The present invention relates to half-wavelength UHV AC transmission technique field, be specifically related to a kind of flexible tuner of T-shaped mixing.
Background technology
Half-wavelength ac transmission (Half Wavelength AC Transmission, HWACT) refer to transmission of electricity electric away from
From close to 1 power frequency half-wavelength, i.e. the three-phase alternating current transmission of electricity of the overlength distance of 3000km (50Hz) or 2600km (60Hz).Along with
Overlength distance, being continuously increased of high power transmission demand, the exchange of half-wavelength UHV AC transmission technique especially extra-high voltage half-wavelength is defeated
Electricity is again by numerous concerns and research.Half-wavelength alternating current circuit under lossless case is just as preferable change that no-load voltage ratio is-1.0
Depressor, head end voltage is identical with terminal voltage size, opposite in phase.Meanwhile, half-wavelength UHV AC transmission technique also has following excellent
Point: one is that the power factor of half-wavelength transmission line of alternation current is of a relatively high, and at transmission distance equal to or slightly greater than half-wavelength
In the case of, its structure is simpler than existing overlength distance AC and DC transmission system；Furthermore, for developing country
Speech, ac transmission equipment manufacture than the introduction of current converter, run and safeguard the simplest, economical.
Half-wavelength transmission line of alternation current is limited by objective condition, and the natural length of actual track is difficult to exactly half ripple
Long.When line length deficiency half-wavelength, need to use tuning circuit or compensate circuit the electrical length of transmission line of electricity is carried out
Artificial compensation, to reach the purpose of artificial half-wavelength transmission line of alternation current.At present, existing half-wavelength ac transmission compensation scheme
It is to carry out transmission line of electricity tuning based on passive network, the π type tuning dress shown in T-shaped tuner as shown in Figure 1 and Fig. 2
Put.But, both tunings scheme limits development and the application of half-wavelength UHV AC transmission technique to a certain extent, one be by
Relatively poor to the adaptability of system structure, the method for operation or Parameters variation in passive tuning circuit, easily lose half-wavelength special
Property；Two when being due to passive tuning circuit short circuit occurred inside fault, easily causes resonance, produces the overvoltage that amplitude is the highest, this
Require that circuit and equipment improve corresponding insulating requirements, or require that installing corresponding overvoltage restriction carrys out limiting circuitry
Overvoltage.
Summary of the invention
For the defect of passive tuning circuit in prior art, the invention provides a kind of T-shaped mixing flexibility tuning dress
Put.
The technical scheme is that
Described tuner is arranged in AC transmission system, including a capacitive compensation unit and two inductive compensation lists
Unit；One end of described capacitive compensation unit is accessed between the said two inductive compensation unit of series connection, other end ground connection；
Described tuner includes STATCOM STATCOM and/or SSSC SSSC；
Described STATCOM STATCOM parallel connection accesses the transmission line of electricity between said two inductive compensation unit,
Described SSSC SSSC series connection accesses in the transmission line of electricity of described inductive compensation unit side.
The optimal technical scheme that the present invention further provides is: STATCOM STATCOM in described tuner
Include with the combination configuration mode of SSSC SSSC:
First combination configuration mode: described tuner only includes one group of SSSC SSSC；
Second combination configuration mode: described tuner only includes one group of STATCOM STATCOM；
3rd combination configuration mode: described tuner include one group of SSSC SSSC and one group static
Synchronous compensator STATCOM；
4th combination configuration mode: described tuner includes two groups of SSSC SSSC；
5th combination configuration mode: described tuner include two groups of SSSC SSSC and one group static
Synchronous compensator STATCOM.
The optimal technical scheme that the present invention further provides is: described STATCOM STATCOM accesses described defeated
The parallel way of electric line includes:
Described STATCOM STATCOM is directly in parallel accesses transmission line of electricity；Or,
Described STATCOM STATCOM accesses transmission line of electricity by transformers connected in parallel, and increases described static same
The capacitive output of step compensator STATCOM.
The optimal technical scheme that the present invention further provides is: described SSSC SSSC accesses described defeated
The series system of electric line includes:
Described SSSC SSSC directly connects and accesses described transmission line of electricity；Or,
Described SSSC SSSC accesses described transmission line of electricity by transformer series, and reduces described quiet
Only synchronize the perceptual output of series compensator SSSC.
The optimal technical scheme that the present invention further provides is: when described tuner is arranged on AC transmission system, its
Configuration mode includes:
It is arranged in the sending end of alternating current circuit；Or,
It is arranged in the receiving end of alternating current circuit；Or,
It is arranged in sending end and the receiving end of alternating current circuit；Or,
It is arranged in the stage casing of alternating current circuit.
The optimal technical scheme that the present invention further provides is:
When described tuner is arranged in alternating current circuit sending end, AC transmission system is carried out flexible tuning control, flexibility
The suppression of cutting-in control, power factor compensation, transient overvoltage and steady state voltage control；
When described tuner is arranged in alternating current circuit receiving end, AC transmission system is carried out flexible tuning control, flexibility
The suppression of cutting-in control, transient overvoltage and steady state voltage control；
When described tuner is arranged in stage casing, alternating current circuit, AC transmission system is carried out flexible tuning control, transient state
Overvoltage suppressing and steady state voltage control.
The optimal technical scheme that the present invention further provides is: described tuner carries out flexible tune to AC transmission system
Humorous control so that it is meet the requirement of half-wavelength AC transmission system, including:
By output equivalent is described AC transmission system of described SSSC SSSC series electrical
Sense/series reactance；By output equivalent is described AC transmission system of described STATCOM STATCOM parallel connection
Electric capacity；
Control described SSSC SSSC and described inductive compensation unit jointly exports described half-wavelength and hands over
Inductance value needed for stream transmission system；Control described STATCOM STATCOM and described capacitive compensation unit is the most defeated
Go out the capacitance needed for described half-wavelength AC transmission system.
The optimal technical scheme that the present invention further provides is: when the line construction of described AC transmission system, parameter and/
Or the method for operation is when changing, by adjusting the equivalent inductance value and described static of described SSSC SSSC output
The equivalent capacitance value of synchronous compensator STATCOM output so that the inductance value of described AC transmission system and capacitance meet institute
State the requirement of half-wavelength AC transmission system.
The optimal technical scheme that the present invention further provides is: described tuner carries out flexible tune to AC transmission system
After the humorous requirement complying with half-wavelength AC transmission system, described AC transmission system is carried out flexible cutting-in control, power
The suppression of factor compensation, transient overvoltage and steady state voltage control.
The optimal technical scheme that the present invention further provides is: described tuner includes that two groups of Static Synchronous Series compensate
Device SSSC and one group of STATCOM STATCOM, this device carries out flexible cutting-in control and includes AC transmission system:
The output equivalent of the SSSC SSSC that will be far from grid-connected place is a series inductance/series electrical
Anti-, the output equivalent near the SSSC SSSC at grid-connected place is a series voltage, controls described static same
The equivalent voltage value of step series compensator SSSC output so that the voltage of two grid-connected alternating current power supplys is identical, phase place is consistent；
When the equivalent voltage value of the described output of the SSSC SSSC near grid-connected place reaches its maximum
Time, adjusting the described output equivalent away from the SSSC SSSC at grid-connected place is a series voltage, two institutes
State SSSC SSSC co-controlling alternating current power supply grid-connected.
The optimal technical scheme that the present invention further provides is: described tuner carries out flexibility also to AC transmission system
During network control system:
Complete and during by transient state run transition to steady-state operation, by described Static Synchronous when described AC transmission system is grid-connected
The output equivalent of series compensator SSSC is a series inductance/series reactance, controls described SSSC
SSSC and described inductive compensation unit export the inductance value needed for described half-wavelength AC transmission system jointly；
Grid-connected at described AC transmission system, and by transient state run transition to steady-state operation during, adjust described quiet
The only equivalent capacitance value of synchronous compensator STATCOM output, to reduce the generation of grid-connected place disturbance.
The optimal technical scheme that the present invention further provides is: the flexible synchronizing mode of described tuner includes:
After sending end alternating current power supply accesses described AC transmission system, described AC transmission system is again with receiving end alternating current power supply also
Net；
Or,
After receiving end alternating current power supply accesses described AC transmission system, described AC transmission system is again with sending end alternating current power supply also
Net.
The optimal technical scheme that the present invention further provides is: described tuner is arranged on the sending end of alternating current circuit, right
AC transmission system carries out power factor compensation and includes:
It is a shunt capacitance by the output equivalent of described STATCOM STATCOM, controls described Static Synchronous
The equivalent capacitance value of compensator STATCOM output compensates the reactive power of AC transmission system.
The optimal technical scheme that the present invention further provides is: described tuner carries out transient state mistake to AC transmission system
Voltage suppression includes:
It is a parallel reactance by the output equivalent of described STATCOM STATCOM, controls described Static Synchronous
Compensator STATCOM absorbs the reactive power of AC transmission system, with the power-frequency overvoltage of limiting circuitry.
The optimal technical scheme that the present invention further provides is: described tuner carries out stable state electricity to AC transmission system
Voltage-controlled system includes:
When the line voltage distribution of AC transmission system is on the low side, by the output equivalent of described STATCOM STATCOM
Being a shunt capacitance, the equivalent capacitance value controlling described STATCOM STATCOM output compensates AC transmission system
Reactive power, to support described line voltage distribution；
When the line voltage distribution of AC transmission system is higher, by the output equivalent of described STATCOM STATCOM
It is the shunt capacitance that a capacitance is less, or is equivalent to a shunt inductance/reactance, control described STATCOM
The equivalent capacitance value of STATCOM output or equivalent inductance value compensate the reactive power of AC transmission system, to support described line
Road voltage.
The optimal technical scheme that the present invention further provides is: the output bag of described STATCOM STATCOM
Include basic output and extra output；
According to STATCOM STATCOM, described AC transmission system is carried out the requirement that flexible tuning controls, and
Its parallel way accessing described AC transmission system determines described basic output；
According to STATCOM STATCOM, described AC transmission system is carried out flexible cutting-in control, power factor
Compensate, transient overvoltage suppresses and the requirement of steady state voltage control determines described extra output.
The optimal technical scheme that the present invention further provides is: the output bag of described SSSC SSSC
Include basic output and extra output；
According to SSSC SSSC, described AC transmission system is carried out the requirement that flexible tuning controls, and
Its series system accessing described AC transmission system determines described basic output；
Described AC transmission system is carried out described in flexible cutting-in control extra according to SSSC SSSC
Output.
The optimal technical scheme that the present invention further provides is: described tuner includes that two groups of Static Synchronous Series compensate
During device SSSC, the output of the two is identical or different.
Compared with immediate prior art, the invention has the beneficial effects as follows:
1, the one flexible tuner of T-shaped mixing that the present invention provides, its STATCOM STATCOM and static with
Step series compensator SSSC can the respective output of flexible, to adapt to the structure of transmission line of electricity, parameter and the method for operation
Change, it is ensured that transmission line of electricity presents the characteristic of half-wave power transmission system, the most also can possess power factor compensation, flexible and network control
The functions such as the suppression of system, transient overvoltage and steady state voltage control；
2, the one flexible tuner of T-shaped mixing that the present invention provides is relative to common power system synchronizing mode, logical
Crossing SSSC SSSC and STATCOM STATCOM can the electricity of flexible half-wave power transmission circuit
Pressure size and phase place, therefore, flexible grid-connected concern voltage phase sequence and the frequency of only needing, thus decrease regulation two and treat also
Identical the increased workload consistent with phase place of voltage swing of net AC system/alternating current power supply, reduces grid-connected technology and wants
Ask.
Accompanying drawing explanation
Fig. 1: T-shaped tuner schematic diagram；
Fig. 2: π type tuner schematic diagram；
Fig. 3: a kind of flexible tuner schematic diagram of T-shaped mixing in the embodiment of the present invention；
Fig. 4: in the embodiment of the present invention, the flexible tuner of T-shaped mixing is arranged in sending end and the receiving end signal of alternating current circuit
Figure；
Fig. 5: in the embodiment of the present invention, the flexible tuner of T-shaped mixing is arranged in the stage casing schematic diagram of alternating current circuit.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely illustrated, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Combining accompanying drawing separately below, the one flexible tuner of T-shaped mixing providing the embodiment of the present invention illustrates.
Fig. 3 is a kind of flexible tuner schematic diagram of T-shaped mixing in the embodiment of the present invention, as it can be seen, in the present embodiment
Tuner includes a capacitive compensation unit, two inductive compensation unit, STATCOM STATCOM and/or static
Synchronizing series compensator SSSC, one end of capacitive compensation unit is accessed between two inductive compensation unit of series connection, another termination
Ground.Wherein,
Capacitive compensation unit includes a shunt capacitance, and inductive compensation unit includes a series inductance；
STATCOM STATCOM parallel connection accesses the transmission line of electricity between two inductive compensation unit；
SSSC SSSC series connection accesses in the transmission line of electricity of inductive compensation unit side.
In the present invention, in tuner, STATCOM STATCOM and SSSC SSSC includes five
Plant combination configuration mode, particularly as follows:
First combination configuration mode: tuner only includes one group of SSSC SSSC；
Second combination configuration mode: tuner only includes one group of STATCOM STATCOM；
3rd combination configuration mode: tuner includes one group of SSSC SSSC and one group of Static Synchronous
Compensator STATCOM；
4th combination configuration mode: tuner includes two groups of SSSC SSSC；
5th combination configuration mode: tuner includes two groups of SSSC SSSC and one group of Static Synchronous
Compensator STATCOM.
In the present invention, the parallel way of STATCOM STATCOM access transmission line of electricity includes:
(1) STATCOM STATCOM is directly in parallel accesses transmission line of electricity.
(2) STATCOM STATCOM accesses transmission line of electricity by transformers connected in parallel, and increases Static Synchronous compensation
The capacitive output of device STATCOM.In the present embodiment, the electric pressure of half-wave power transmission circuit is higher, STATCOM
STATCOM is accessed in transmission line of electricity by booster transformer, is accessed by transformator as STATCOM STATCOM simultaneously
After transmission line of electricity, the short-circuit impedance of transformator is equivalent to reduce the value of shunt capacitance, accordingly, it would be desirable to correspondingly increase static same
The capacitive output of step compensator STATCOM.
In the present invention, the series system of SSSC SSSC access transmission line of electricity includes:
(1) SSSC SSSC directly connects access transmission line of electricity.
(2) SSSC SSSC accesses transmission line of electricity by transformer series, and reduces Static Synchronous string
The perceptual output of connection compensator SSSC.In the present embodiment, the line current of half-wave power transmission circuit is relatively big, Static Synchronous Series
Compensator SSSC is accessed in transmission line of electricity by transformator, is accessed by transformator as SSSC SSSC simultaneously
After transmission line of electricity, the leakage inductance of transformator adds the value of series inductance, therefore, it can correspondingly reduce Static Synchronous Series and compensates
The perceptual output of device SSSC.
When in the present invention, tuner is arranged on AC transmission system, including five kinds of configuration modes, particularly as follows:
(1) sending end of alternating current circuit it is arranged in.
When tuner is arranged in alternating current circuit sending end by the present embodiment, AC transmission system is carried out flexible tuning control
System, flexible cutting-in control, power factor compensation, transient overvoltage suppression and steady state voltage control.
(2) receiving end of alternating current circuit it is arranged in.
Fig. 4 is sending end and the receiving end schematic diagram that in inventive embodiments, the flexible tuner of T-shaped mixing is arranged in alternating current circuit,
During as it can be seen, tuner is arranged in alternating current circuit receiving end by the present embodiment, AC transmission system is carried out flexible tuning
Control, flexible cutting-in control, transient overvoltage suppress and steady state voltage controls.
(3) sending end and the receiving end of alternating current circuit it are arranged in.
(4) stage casing of alternating current circuit it is arranged in.
Fig. 5 is the stage casing schematic diagram that in the embodiment of the present invention, the flexible tuner of T-shaped mixing is arranged in alternating current circuit, such as figure
Shown in, when tuner is arranged in stage casing, alternating current circuit by the present embodiment, AC transmission system is carried out flexible tuning control,
Transient overvoltage suppression and steady state voltage control.
In the present invention, tuner carries out flexible tuning and complies with half-wavelength AC transmission system AC transmission system
Requirement after, AC transmission system is carried out flexible cutting-in control, power factor compensation, transient overvoltage suppression and steady state voltage
Control.Control flexibility tuning separately below, flexible cutting-in control, power factor compensation, transient overvoltage suppress and stable state electricity
Voltage-controlled system is specifically described.
1, flexible tuning controls
In the present embodiment, tuner carries out flexible tuning control to AC transmission system so that it is meet half-wavelength exchange defeated
The requirement of electricity system, specifically includes:
Step S11: SSSC SSSC is carried out perception regulation, outputs it and be equivalent to ac transmission system
One series inductance/series reactance of system；STATCOM STATCOM is carried out capacitive regulation, outputs it and be equivalent to
One shunt capacitance of AC transmission system；
Step S12: control SSSC SSSC and inductive compensation unit jointly exports described half-wavelength and hands over
Inductance value needed for stream transmission system；Control STATCOM STATCOM and capacitive compensation unit exports half-wavelength jointly
Capacitance needed for AC transmission system.
It should be understood that
When line construction, parameter and/or the method for operation of AC transmission system change, by adjusting Static Synchronous Series
The equivalent inductance value of compensator SSSC output and the equivalent capacitance value of STATCOM STATCOM output, so that total
Capacitance and inductance value meet the tuning of the half-wavelength AC transmission system after change, finally make whole system present half-wavelength and hand over
Stream transmission system characteristic, i.e. realizes flexibility tuning.
2, flexible cutting-in control
Power system is grid-connected mainly includes four conditions, specifically:
(1) frequency of two grid-connected AC system/alternating current power supplys is identical.
(2) voltage swing of two grid-connected AC system/alternating current power supplys is identical, and maximum deviation should be within 5%.
(3) phase sequence of two grid-connected AC system/alternating current power supplys is identical.
(4) voltage-phase of two grid-connected AC system/alternating current power supplys is identical.
With the tuner shown in Fig. 3, flexible cutting-in control is illustrated below.Set ac transmission in the present embodiment
System meets power system grid-connected conditions (1) and (3), and tuner includes two groups of SSSC SSSC and
Group STATCOM STATCOM.This device carries out flexible cutting-in control to AC transmission system, specifically includes:
SSSC SSSC away from grid-connected place is carried out perception regulation, outputs it and be equivalent to a string
Connection inductance/series reactance, the output equivalent near the SSSC SSSC at grid-connected place is a series voltage, control
The equivalent voltage value of SSSC SSSC processed output so that the voltage of two grid-connected alternating current power supplys is identical, phase
Position is consistent.The present embodiment treats that grid-connected AC system/alternating current power supply additional static synchronizes series compensator SSSC output for one
Equivalent voltage after so that two voltage-phases treating grid-connected AC system/alternating current power supply are consistent, thus meet power system
Four grid-connected conditions.
In the present embodiment, the flexible synchronizing mode of tuner includes:
After sending end alternating current power supply incoming transport transmission system, AC transmission system is grid-connected with receiving end alternating current power supply again；Or,
After receiving end alternating current power supply incoming transport transmission system, AC transmission system is grid-connected with sending end alternating current power supply again.
It should be understood that
(1) its maximum is reached when the equivalent voltage value of the SSSC SSSC output near grid-connected place
Time, adjusting the output equivalent away from the SSSC SSSC at grid-connected place is a series voltage, and two are static same
Step series compensator SSSC co-controlling alternating current power supply is grid-connected.
(2) complete and during by transient state run transition to steady-state operation, by Static Synchronous Series when AC transmission system is grid-connected
The output equivalent of compensator SSSC is a series inductance/series reactance, controls SSSC SSSC and perception
Compensating unit exports the inductance value needed for half-wavelength AC transmission system jointly；
Grid-connected at AC transmission system, and by transient state run transition to steady-state operation during, adjust Static Synchronous mend
Repay the equivalent capacitance value of device STATCOM output, to reduce the generation of grid-connected place disturbance.
In the present embodiment, flexible cutting-in control is relative to common power system synchronizing mode, is mended by Static Synchronous Series
Repay device SSSC and STATCOM STATCOM and can regulate voltage swing and the phase place of half-wave power transmission circuit neatly.
The most flexible grid-connected concern voltage phase sequence and the frequency of only needing, thus decrease regulation two and treat synchronization AC system/friendship
Identical the increased workload consistent with phase place of voltage swing of stream power supply, reduces grid-connected technology requirement.
3, power factor compensation
With the tuner shown in Fig. 3, flexible cutting-in control is illustrated below, set tuner and be arranged on exchange
The sending end of circuit.This device carries out power factor compensation to AC transmission system and includes:
It is a shunt capacitance by the output equivalent of STATCOM STATCOM, controls STATCOM
The equivalent capacitance value of STATCOM output compensates the reactive power of AC transmission system.
During it should be understood that the power factor of sending end alternating current power supply changes, STATCOM can be adjusted
The output of STATCOM, and then make shunt capacitance and STATCOM STATCOM meet flexibility tuning and power factor simultaneously
The requirement compensated.
4, transient overvoltage suppression
With the tuner shown in Fig. 3, flexible cutting-in control is illustrated below.AC transmission system is entered by this device
The suppression of row transient overvoltage includes:
It is a parallel reactance by the output equivalent of STATCOM STATCOM, controls STATCOM
STATCOM absorbs the reactive power of AC transmission system, with the power-frequency overvoltage of limiting circuitry.
Such as, AC transmission system generation singlephase earth fault or end occur that the operating modes such as three-phase removal of load cause power frequency
During overvoltage, transient overvoltage suppression can be carried out by this tuner.
5, steady state voltage controls
With the tuner shown in Fig. 3, flexible cutting-in control is illustrated below.AC transmission system is entered by this device
Row steady state voltage controls to include:
When the line voltage distribution of AC transmission system is on the low side, it is one by the output equivalent of STATCOM STATCOM
Individual shunt capacitance, the equivalent capacitance value controlling STATCOM STATCOM output compensates the idle merit of AC transmission system
Rate, to support line voltage distribution；
When the line voltage distribution of AC transmission system is higher, it is one by the output equivalent of STATCOM STATCOM
The shunt capacitance that individual capacitance is less, or it is equivalent to a shunt inductance/reactance, control STATCOM STATCOM defeated
The equivalent capacitance value gone out or equivalent inductance value compensate the reactive power of AC transmission system, to support line voltage distribution.
In the present invention, the output of STATCOM STATCOM includes basic output and extra output, wherein:
According to STATCOM STATCOM, AC transmission system is carried out the requirement that flexible tuning controls, and connect
The parallel way entering AC transmission system determines basic output.
According to STATCOM STATCOM AC transmission system is carried out flexible cutting-in control, power factor compensation,
The requirement that transient overvoltage suppression and steady state voltage control determines extra output.Such as can be according to flexible cutting-in control, merit
The requirement of any one, two, three or four in the suppression of rate factor compensation, transient overvoltage and steady state voltage control determines volume
Outer output.
It should be understood that during two of the tuner shown in Fig. 3 groups of SSSC SSSC, the two defeated
Output is identical or different.
In the present invention, the output of SSSC SSSC includes basic output and extra output, its
In:
According to SSSC SSSC, AC transmission system is carried out the requirement that flexible tuning controls, and connect
The series system entering AC transmission system determines described basic output.
According to SSSC SSSC, AC transmission system is carried out the flexible extra output of cutting-in control.
The STATCOM STATCOM of the flexible tuner of a kind of T-shaped mixing that the present invention provides and Static Synchronous
Series compensator SSSC can the respective output of flexible, to adapt to the change of the structure of transmission line of electricity, parameter and the method for operation
Change, it is ensured that transmission line of electricity presents the characteristic of half-wave power transmission system, the most also can possess power factor compensation, flexible and network control
The passive tuning circuits such as the suppression of system, transient overvoltage and steady state voltage control.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention
God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof
Within, then the present invention is also intended to comprise these change and modification.
Claims (18)
1. the flexible tuner of T-shaped mixing, is arranged in AC transmission system；Described tuner includes that a capacitive is mended
Repay unit and two inductive compensation unit；The said two inductive compensation unit of series connection is accessed in one end of described capacitive compensation unit
Between, other end ground connection；It is characterized in that,
Described tuner includes STATCOM STATCOM and/or SSSC SSSC；
Described STATCOM STATCOM parallel connection accesses the transmission line of electricity between said two inductive compensation unit, described
SSSC SSSC series connection accesses in the transmission line of electricity of described inductive compensation unit side.
2. a kind of flexible tuner of T-shaped mixing as claimed in claim 1, it is characterised in that static in described tuner
The combination configuration mode of synchronous compensator STATCOM and SSSC SSSC includes:
First combination configuration mode: described tuner only includes one group of SSSC SSSC；
Second combination configuration mode: described tuner only includes one group of STATCOM STATCOM；
3rd combination configuration mode: described tuner includes one group of SSSC SSSC and one group of Static Synchronous
Compensator STATCOM；
4th combination configuration mode: described tuner includes two groups of SSSC SSSC；
5th combination configuration mode: described tuner includes two groups of SSSC SSSC and one group of Static Synchronous
Compensator STATCOM.
3. a kind of flexible tuner of T-shaped mixing as claimed in claim 1, it is characterised in that described STATCOM
STATCOM accesses the parallel way of described transmission line of electricity and includes:
Described STATCOM STATCOM is directly in parallel accesses transmission line of electricity；Or,
Described STATCOM STATCOM accesses transmission line of electricity by transformers connected in parallel, and increases described Static Synchronous benefit
Repay the capacitive output of device STATCOM.
4. a kind of flexible tuner of T-shaped mixing as claimed in claim 1, it is characterised in that described Static Synchronous Series is mended
The series system repaying the device SSSC described transmission line of electricity of access includes:
Described SSSC SSSC directly connects and accesses described transmission line of electricity；Or,
Described SSSC SSSC accesses described transmission line of electricity by transformer series, and reduces described static same
The perceptual output of step series compensator SSSC.
5. a kind of flexible tuner of T-shaped mixing as claimed in claim 1, it is characterised in that described tuner is arranged on
During AC transmission system, its configuration mode includes:
It is arranged in the sending end of alternating current circuit；Or,
It is arranged in the receiving end of alternating current circuit；Or,
It is arranged in sending end and the receiving end of alternating current circuit；Or,
It is arranged in the stage casing of alternating current circuit.
6. a kind of flexible tuner of T-shaped mixing as claimed in claim 5, it is characterised in that
When described tuner is arranged in alternating current circuit sending end, AC transmission system is carried out flexible tuning control, flexible grid-connected
Control, power factor compensation, transient overvoltage suppression and steady state voltage control；
When described tuner is arranged in alternating current circuit receiving end, AC transmission system is carried out flexible tuning control, flexible grid-connected
Control, transient overvoltage suppresses and steady state voltage controls；
When described tuner is arranged in stage casing, alternating current circuit, AC transmission system is carried out flexible tuning control, transient state the most electric
Constrain system and steady state voltage controls.
7. a kind of flexible tuner of T-shaped mixing as claimed in claim 1, it is characterised in that described tuner is to exchange
Transmission system carries out flexible tuning and controls so that it is meet the requirement of half-wavelength AC transmission system, including:
By output equivalent is described AC transmission system of described SSSC SSSC series inductance/string
Connection reactance；By output equivalent is described AC transmission system of described STATCOM STATCOM shunt capacitance；
Control described SSSC SSSC jointly to export described half-wavelength with described inductive compensation unit and exchange defeated
Inductance value needed for electricity system；Control described STATCOM STATCOM and described capacitive compensation unit exports institute jointly
State the capacitance needed for half-wavelength AC transmission system.
8. a kind of flexible tuner of T-shaped mixing as claimed in claim 7, it is characterised in that when described AC transmission system
Line construction, parameter and/or the method for operation be when changing, by adjust described SSSC SSSC output etc.
Effect inductance value and the equivalent capacitance value of described STATCOM STATCOM output so that the electricity of described AC transmission system
Inductance value and capacitance meet the requirement of described half-wavelength AC transmission system.
9. a kind of flexible tuner of T-shaped mixing as claimed in claim 1, it is characterised in that described tuner is to exchange
After transmission system carries out the requirement that flexible tuning complies with half-wavelength AC transmission system, described AC transmission system is carried out
Flexible cutting-in control, power factor compensation, transient overvoltage suppression and steady state voltage control.
10. a kind of flexible tuner of T-shaped mixing as claimed in claim 9, it is characterised in that described tuner includes two
Group SSSC SSSC and one group of STATCOM STATCOM, AC transmission system is carried out by this device
Flexible cutting-in control includes:
The output equivalent of the SSSC SSSC that will be far from grid-connected place is a series inductance/series reactance, leans on
The output equivalent of the SSSC SSSC at nearly grid-connected place is a series voltage, controls described Static Synchronous Series
The equivalent voltage value of compensator SSSC output so that the voltage of two grid-connected alternating current power supplys is identical, phase place is consistent；
When the equivalent voltage value of the described output of the SSSC SSSC near grid-connected place reaches its maximum, adjust
The whole described output equivalent away from the SSSC SSSC at grid-connected place is a series voltage, and two described static
Synchronize series compensator SSSC co-controlling alternating current power supply grid-connected.
11. a kind of flexible tuners of T-shaped mixing as claimed in claim 10, it is characterised in that described tuner is to friendship
During stream transmission system carries out flexible cutting-in control:
Complete and during by transient state run transition to steady-state operation, by described Static Synchronous Series when described AC transmission system is grid-connected
The output equivalent of compensator SSSC is a series inductance/series reactance, control described SSSC SSSC and
Described inductive compensation unit exports the inductance value needed for described half-wavelength AC transmission system jointly；
Grid-connected at described AC transmission system, and by transient state run transition to steady-state operation during, adjust described static with
The equivalent capacitance value of step compensator STATCOM output, to reduce the generation of grid-connected place disturbance.
The 12. flexible tuners of T-shaped mixing as claimed in claim 10 a kind of, it is characterised in that described tuner soft
Property synchronizing mode includes:
After sending end alternating current power supply accesses described AC transmission system, described AC transmission system is grid-connected with receiving end alternating current power supply again；
Or,
After receiving end alternating current power supply accesses described AC transmission system, described AC transmission system is grid-connected with sending end alternating current power supply again.
13. a kind of flexible tuners of T-shaped mixing as claimed in claim 9, it is characterised in that described tuner is arranged on
The sending end of alternating current circuit, carries out power factor compensation to AC transmission system and includes:
It is a shunt capacitance by the output equivalent of described STATCOM STATCOM, controls described Static Synchronous and compensate
The equivalent capacitance value of device STATCOM output compensates the reactive power of AC transmission system.
14. a kind of flexible tuners of T-shaped mixing as claimed in claim 9, it is characterised in that described tuner is to exchange
Transmission system carries out transient overvoltage suppression and includes:
It is a parallel reactance by the output equivalent of described STATCOM STATCOM, controls described Static Synchronous and compensate
Device STATCOM absorbs the reactive power of AC transmission system, with the power-frequency overvoltage of limiting circuitry.
15. a kind of flexible tuners of T-shaped mixing as claimed in claim 9, it is characterised in that described tuner is to exchange
Transmission system carries out steady state voltage and controls to include:
When the line voltage distribution of AC transmission system is on the low side, it is one by the output equivalent of described STATCOM STATCOM
Individual shunt capacitance, the equivalent capacitance value controlling described STATCOM STATCOM output compensates the nothing of AC transmission system
Merit power, to support described line voltage distribution；
When the line voltage distribution of AC transmission system is higher, it is one by the output equivalent of described STATCOM STATCOM
The shunt capacitance that individual capacitance is less, or it is equivalent to a shunt inductance/reactance, control described STATCOM
The equivalent capacitance value of STATCOM output or equivalent inductance value compensate the reactive power of AC transmission system, to support described line
Road voltage.
16. a kind of flexible tuners of T-shaped mixing as claimed in claim 1, it is characterised in that described STATCOM
The output of STATCOM includes basic output and extra output；
According to STATCOM STATCOM, described AC transmission system is carried out the requirement that flexible tuning controls, and connect
The parallel way entering described AC transmission system determines described basic output；
According to STATCOM STATCOM described AC transmission system is carried out flexible cutting-in control, power factor compensation,
The requirement that transient overvoltage suppression and steady state voltage control determines described extra output.
17. a kind of flexible tuners of T-shaped mixing as claimed in claim 1, it is characterised in that described Static Synchronous Series is mended
The output repaying device SSSC includes basic output and extra output；
According to SSSC SSSC, described AC transmission system is carried out the requirement that flexible tuning controls, and connect
The series system entering described AC transmission system determines described basic output；
Carry out described AC transmission system additionally exporting described in flexible cutting-in control according to SSSC SSSC
Amount.
18. a kind of flexible tuners of T-shaped mixing as claimed in claim 1, it is characterised in that described tuner includes two
During group SSSC SSSC, the output of the two is identical or different.
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| CN113595076A (en) * | 2021-07-31 | 2021-11-02 | 华北电力大学（保定） | Novel long-distance power transmission method |
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