CN106130021A - A kind of flexible tuner of T-shaped mixing - Google Patents

A kind of flexible tuner of T-shaped mixing Download PDF

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Publication number
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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CN
China
Prior art keywords
sssc
statcom
transmission system
tuner
flexible
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Granted
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CN201610462950.5A
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Chinese (zh)
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CN106130021B (en
Inventor
戴朝波
王鑫
孔飞
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
Electric Power Research Institute of State Grid Xinjiang Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
Electric Power Research Institute of State Grid Xinjiang Electric Power Co Ltd
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Priority to CN201610462950.5A priority Critical patent/CN106130021B/en
Publication of CN106130021A publication Critical patent/CN106130021A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01Arrangements for reducing harmonics or ripples
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842Arrangements 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10Flexible AC transmission systems [FACTS]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Emergency Protection Circuit Devices (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

A kind of flexible tuner of T-shaped mixing
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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