CN104767191B - A kind of inverter earthed system - Google Patents
A kind of inverter earthed system Download PDFInfo
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- CN104767191B CN104767191B CN201510164359.7A CN201510164359A CN104767191B CN 104767191 B CN104767191 B CN 104767191B CN 201510164359 A CN201510164359 A CN 201510164359A CN 104767191 B CN104767191 B CN 104767191B
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- 229910044991 metal oxide Inorganic materials 0.000 claims description 16
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- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 8
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
- H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
- H02M5/04—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
- H02M5/10—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
- H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
- H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
- H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a kind of inverter earthed system, the inverter is inverter, the cascade inverter of H bridge, the inverter of striding capacitance or the inverter of diode clamp of MMC；The system comprises the inverters that DC side is connected；The exchange side of one of them inverter is in parallel with electric system by transformer T1；The winding of the valve side of the transformer T1 is equipped with overvoltage protection and earthing or grounding means；The exchange side of another inverter passes through connection transformer T2 and Cascade System；The winding of the valve side of the transformer T2 is equipped with overvoltage protection and earthing or grounding means.The characteristics of technical solution provided by the invention is according to MMC technology is studied and proposes to be suitble to THE UPFC, the inverter earthed system of convertible static compensator, Research on Unified Power Quality Conditioner.
Description
Technical field:
The present invention relates to power electronic devices fields, are more particularly to a kind of inverter earthed system.
Background technique:
The neutral point of electric system refers to the neutral point of the transformer (or generator) of star-like connection.Neutral point in electric power system
Earthing mode is divided to neutral point effective grounding mode and two kinds of neutral non-effective grounding mode.Neutral non-effective grounding mode can
It is divided into isolated neutral mode, neutral point low resistance grounding mode, neutral point High Resistance Grounding Mode and neutral point resonance to connect
Ground mode.
Neutral point High Resistance Grounding Mode refers to an at least conducting wire in system or a little passes through high resistance grounding, system etc.
Value zero sequence resistance is single-phase no more than system to be distributed capacitive reactance over the ground, and system earth fault current is less than 10A.
Neutral point low resistance grounding mode refers to an at least conducting wire in system or a little passes through low resistance earthing, system etc.
It is worth zero sequence resistance and is not less than 2 times of system equivalent zero sequence induction reactance.
Neutral point resonance neutral grounding refers to an at least conducting wire in system or is a little grounded by inductance, for compensating system
It unites the capacitive component of single-phase fault to ground electric current.
Usually there are three types of selections for the earthing mode of single inverter, i.e.,
(1) it is grounded by the clamp resistance of direct-current polar.The advantages of grounding scheme is simple, direct, effective, and cost
It is lower.For DC transmission system, the disadvantage is that after being grounded by direct current clamp resistance, when AC line trackside operates normally, pincers
Position resistance is a permanent load, and power loss is larger.In addition, the resistance value variations of resistor will lead to direct current after longtime running
Line voltage deviation.For THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner etc., situation class
Seemingly.
(2) become the grounded resistance eutral grounding of Y winding by being coupled.Its advantage is that directly being connect using transformer Y winding neutral point
Ground, grounding apparatus are few；The disadvantage is that fully relying on transformer Y winding bears DC voltage and fault current under failure, to transformation
Device proposes high requirement, when transformer whole volume is larger, manufactures and designs relatively difficult.Moreover, this ground connection side
Case needs net side that can just play the role of that alternating current-direct current is isolated using earth-free winding type, in the exchange that neutral point must be grounded
In system, it is also contemplated that being grounded in the station of other modes.
(3) Neutral Grounding through Resistance in Electrical is formed by reactor.The advantages of program is that reactor has shared fault current,
Smaller to the pressure for being coupled transformer, reactor can also play the role of limiting short-circuit current, and shortcoming is for high voltage
Grade, the reactive power that shunt reactor itself absorbs is larger, may be larger to systematic influence, and manufacturing cost and volume
It can be larger.
THE UPFC (unified power flow controller, UPFC) is by synchronous voltage source inverter
It constitutes for controlling various parameters related with transmission line of electricity trend, including voltage, active power, reactive power, line impedance
With the device of voltage-phase.It has concentrated thyristor controlled series capacitor compensation device (Thyristor Controlled
Series Capacitor, TCSC), controlled series phase shifter, voltage regulator, static synchronous compensating device (static
Synchronous compensator, STATCOM) various functions and feature.
Since convertible static compensator has considerable flexibility, modularity, scalability and mutual transfer capability,
Therefore, it is considered to be third generation flexible AC transmission device.
Research on Unified Power Quality Conditioner (Unified Power Quality Conditioner, UPQC) is collection tandem type
With parallel connection type compensation device in the mixed power quality control device of one, for solving the problems, such as the quality of voltage in power distribution network
It is a kind of device of comprehensive treatment power quality problem with current quality problem.Its parallel units is equivalent to one and is parallel to electricity
The controllable current source of net, harmonic current and reactive current needed for being provided to load, so as to improve net side power factor；It is connected
Unit is equivalent to the controllable voltage source between the system of being series at and load, real-time compensation nominal voltage and system virtual voltage
Difference, to provide quality power for load.
All there are two inverters for THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner, and
There is corresponding transformer, completes the functions such as isolation and transformation.Obviously, earthing mode be THE UPFC, it is convertible static
One of the critical problem that must be solved first in the engineerings such as compensator and Research on Unified Power Quality Conditioner, it is mentioned for whole system
The basis of current potential and over-voltage studies, Insulation Coordination design for reference, even more a very important ring in system design
Section.
From Siemens Company propose modularization multi-level converter topology (modular multilevel converters,
MMC after), the inverter based on MMC technology has obtained engineer application and popularization, MMC technology in DC transmission engineering first
Large number of insulated gate bipolar junction transistor (insulated gate bipolar transistor, IGBT) is not needed directly to connect
The valve of composition, greatly reduces the technical difficulty of high-power inverter, so that MMC technology be made gradually to control in Unified Power Flow
It is studied and is applied in device, convertible static compensator and Research on Unified Power Quality Conditioner.
When short trouble occurs using the MMC-HVDC DC side of half-bridge structure, full-controlled switch device such as IGBT institute is instead simultaneously
The freewheeling diode of connection is easy to constitute the energy feeding circuit that fault point is directly connected to AC system, can not rely on the change of current merely
The removing of DC side fault current is completed in device movement.It is having put into operation at present, adopted mostly using the MMC-HVDC engineering of half-bridge structure
With cable laying-out, to reduce DC Line Fault probability of happening, but involve great expense, economic benefit it is slightly poor.
For the THE UPFC of modularization multi-level converter composition, convertible static compensator and unified electric energy
Quality adjustor, system dc side does not have the capacitor of centralized arrangement, but uses the distribution in each power module of bridge arm
The arrangement of capacitor.In addition, since the inherent shortcoming of MMC inverter DC Line Fault can not be effectively treated in prior art presence,
It is such as grounded by the DC side of MMC inverter, then will increase the probability that bipolar short trouble occurs for DC side.
The characteristics of how according to MMC technology, study and propose be suitble to THE UPFC, convertible static compensator,
The inverter earthing mode of Research on Unified Power Quality Conditioner is that the application should solve the problems, such as.
Summary of the invention:
The object of the present invention is to provide a kind of inverter earthed systems, are suitble to THE UPFC, convertible static benefit
Repay device, Research on Unified Power Quality Conditioner inverter earthed system.
To achieve the above object, the invention adopts the following technical scheme: a kind of inverter earthed system, is suitable for unified tide
Stream controller, convertible static compensator and Research on Unified Power Quality Conditioner；The inverter is the inverter of MMC, the cascade of H bridge
Inverter, the inverter of striding capacitance or the inverter of diode clamp；The system comprises the inverters that DC side is connected；
The exchange side of one of them inverter is in parallel with electric system by transformer T1；The winding of the valve side of the transformer T1
Equipped with overvoltage protection and earthing or grounding means；The exchange side of another inverter passes through connection transformer T2 and system string
Connection；The winding of the valve side of the transformer T2 is equipped with overvoltage protection and earthing or grounding means.
A kind of inverter earthed system provided by the invention, the transformer T1 include that electric system side is connect using triangle
The winding of method and valve side use the winding of star connection；The valve side of the transformer T1 uses the first star of the winding of star connection
Shape neutral point is drawn.
A kind of inverter earthed system provided by the invention, the first star neutral point pass through metal oxide arrester
MOA1 carries out overvoltage protection；Earthing or grounding means JD1 is in parallel with the MOA1 after connecting with isolation switch DS1.
Another preferred a kind of inverter earthed system provided by the invention, the transformer T2 includes that electric system side is each
The winding of star connection is used from independent winding and valve side；The valve side of the transformer T2 using star connection winding the
Two star neutral points are drawn.
Another preferred a kind of inverter earthed system provided by the invention, the second star neutral point pass through metal oxygen
Compound arrester MOA2 carries out overvoltage protection；Earthing or grounding means JD2 is in parallel with the MOA2 after connecting with isolation switch DS2.
Another preferred a kind of inverter earthed system provided by the invention, the transformer T2 are equipped with and are connect using triangle
The tertiary winding of method.
Another preferred a kind of inverter earthed system provided by the invention, when the earthed system passes through as convertible
When the earthed system of static compensator realizes double static synchronous compensating device methods of operation, the transformer T3 and the power train
System is in parallel；The transformer T3 include electric system side using the winding of delta connection and valve side using star connection around
Group；It is drawn using the third star neutral point of the winding of star connection the valve side of the transformer T3；The third star is neutral
Point carries out overvoltage protection by metal oxide arrester MOA3；Earthing or grounding means JD3 connect with isolation switch DS3 after with MOA3
It is in parallel.
Another preferred a kind of inverter earthed system provided by the invention, when the earthed system passes through as convertible
When the earthed system of static compensator realizes double Static Synchronous Series compensation device methods of operation, the transformer T4 and the electricity
Force system series connection；The transformer T4 includes the winding that electric system side winding independent and valve side use star connection；
The valve side of the transformer T4 uses the 4th star neutral point of winding when star connection to draw；The 4th star neutral point is logical
It crosses metal oxide arrester MOA4 and carries out overvoltage protection；Earthing or grounding means JD4 connect with isolation switch DS4 after with the MOA4
It is in parallel.
Another preferred a kind of inverter earthed system provided by the invention, when one inverter and another change of current
When device combined operating, the earthed system is grounded by earthing or grounding means, and provides reference potential.
Another preferred a kind of inverter earthed system provided by the invention, when one inverter and another change of current
Device respectively independent operating when, one inverter is grounded by its corresponding earthing or grounding means, and provides reference potential；Institute
It states another inverter to be grounded by its corresponding earthing or grounding means, and reference potential is provided.
Compared with the nearest prior art, the technical scheme provide by that invention has the following excellent effect
1, the earthing mode that technical solution provided by the invention is proposed is adaptable, applicable THE UPFC,
Convertible static compensator, Research on Unified Power Quality Conditioner etc.；
2, the earthing or grounding means JD of technical solution provided by the invention is furnished with corresponding isolation switch DS, facilitates earthing or grounding means JD
Investment and exit, according to the method for operation of above-mentioned different device inverter, conveniently realize various groups of flexible earthing mode
It closes；
3, the metal oxide arrester MOA of technical solution provided by the invention is directly connected with transformer neutral point,
Regardless of whether isolation switch DS closes a floodgate, transformer neutral point always can be by the protection of metal oxide arrester MOA；
4, technical solution provided by the invention is effectively prevented from is grounded by direct current clamp resistance, does not increase DC side
The probability of bipolar short trouble occurs；
5, technical solution provided by the invention is effectively prevented from and forms the grounded device of neutral point by reactor and is grounded,
Reduce corresponding equipment, land occupation is also corresponding to be reduced
6, technical solution provided by the invention uses a grounding point, and it is logical to avoid passing through one zero sequence of multiple grounding points formation
Road, to have zero-sequence current, three-phase three-wire system inverter will eliminate zero-sequence current and need brought by additional control means
All difficulties.
Detailed description of the invention
Fig. 1 is the inverter earthing mode schematic diagram of the THE UPFC of technical solution provided by the invention；
Fig. 2 is the earthing or grounding means schematic diagram of technical solution provided by the invention；
Fig. 3 has the earthing mode when tertiary winding for the THE UPFC series side of technical solution provided by the invention
Schematic diagram；
Fig. 4 is the convertible static compensator of technical solution provided by the invention as double static synchronous compensating device operations
When earthing mode schematic diagram；
Fig. 5 is the convertible static compensator of technical solution provided by the invention as double Static Synchronous Series compensation devices
Earthing mode schematic diagram when operation；
Equivalent zero sequence when Fig. 6 is the inverter earthing mode of the THE UPFC of technical solution provided by the invention
Access schematic diagram；
It is grounded and is illustrated by JD1 when Fig. 7 is 2 combined operating of inverter 1 and inverter of technical solution provided by the invention
Figure；
It is grounded and is illustrated by JD2 when Fig. 8 is 2 combined operating of inverter 1 and inverter of technical solution provided by the invention
Figure；
Pass through JD1 and JD2 when Fig. 9 is the 2 respective independent operating of inverter 1 and inverter of technical solution provided by the invention
It is grounded schematic diagram.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment 1:
The technical solution of the invention of this example is directed to the characteristics of MMC inverter of half-bridge structure and requirement, with Unified Power Flow control
For device processed, connecing for applicable THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner is proposed
Ground system, as shown in Fig. 1.Wherein, the DC side of inverter 1 is connected with the DC side of inverter 2.1/ inverter of inverter
2 can be the inverter of the inverter of MMC, the cascade inverter of H bridge, the inverter of striding capacitance, diode clamp.Inverter
1 exchange side is connected in parallel by shunt transformer T1 with system, and only there are two winding, shunt transformer T1 by shunt transformer T1
The winding of system side uses delta connection, and the winding of shunt transformer T1 valve side uses star connection.Shunt transformer T1
One star neutral point is drawn, and the first star neutral point carries out overvoltage protection by metal oxide arrester MOA1.Ground connection dress
It sets in parallel with MOA1 after JD1 connects with isolation switch DS1.The exchange side of inverter 2 passes through series transformer T2 and Cascade System
Connection, the system side winding of series transformer T2 is respectively independent, and the valve side winding of series transformer T2 uses star connection.Series connection
The second star neutral point of transformer T2 is drawn, and the second star neutral point carries out overvoltage by metal oxide arrester MOA2
Protection.Earthing or grounding means JD2 is in parallel with MOA2 after connecting with isolation switch DS2.It should be noted that when Practical Project is implemented, meeting
There are many isolation switch, breaker, current measure device, voltage measuring apparatus.Here these equipment are not drawn, do not indicate work
When journey actual implementation, these equipment are not present.
The every of transmission line of electricity relatively has capacitance current, and therefore, neutral ground uses neutral point resonance grounding sometimes
Mode, the capacitive component for the single-phase fault to ground electric current of compensation system.There is also stray electricals over the ground for 1/ inverter 2 of inverter
Hold, but compared with route, it is many smaller, it therefore, there is no need to using neutral point resonance neutral grounding.Ground connection dress in attached drawing 5
Set JD1/JD2 can by resistance eutral grounding, attached drawing 2 a) as shown in, can also be directly grounded, such as the b of attached drawing 2) as shown in.
It is directly grounded as used, and corresponding isolation switch DS1/DS2 is constantly in "on" position, then corresponding metal oxide is lightning-arrest
Device MOA1/MOA2 can be omitted.
As shown in Fig. 1, the system side winding of series transformer T2 is respectively independent, and valve side uses star-like ground connection, zero sequence
Component does not have corresponding access, may bring some difficulties to the design of transformer.The tertiary winding of transformer can be increased, and
Using delta connection, corresponding earthing mode is as shown in Fig. 3.
Convertible static compensator converts Static Synchronous in pairs by isolation switch appropriate switching and spare transformer
Compensation device (static synchronous compensator, STATCOM) method of operation.Static synchronous compensating device is by simultaneously
The voltage source converter for joining access system is constituted, and can issue or the silent oscillation of absorbing reactive power synchronizes reactive power source.Pass through
Certain parameters (such as voltage) of electric system can be controlled by changing its output.Once it was referred to as novel static reactive dress
Set (ASVC), reacance generator (SVG), static phase modifier (STATCON) etc..Convert ground connection side when STATCOM mode in pairs
Formula is as shown in Fig. 4.It is to be noted that shunt transformer T3 belongs to spare transformer.Shunt transformer T3 is two windings
Transformer, the winding of shunt transformer T3 system side use delta connection, and the winding of shunt transformer T3 valve side uses star
Connection.The third star neutral point of shunt transformer T3 is drawn, and third star neutral point passes through metal oxide arrester MOA2
Carry out overvoltage protection.Earthing or grounding means JD2 is in parallel with MOA2 after connecting with isolation switch DS2.It should be pointed out that can also adopt
It is connected with completely new metal oxide arrester MOA3, earthing or grounding means JD3 with isolation switch DS3 with shunt transformer T3.
Convertible static compensator converts Static Synchronous in pairs by isolation switch appropriate switching and spare transformer
Series compensation device (static series synchronous compensator, SSSC or S3C) the method for operation.It is static same
Series compensation device and Cascade System are walked, based on the voltage source converter (Voltage that can turn off power electronic devices composition
Source Converter, VSC), a synchronous idle electricity of silent oscillation with line current at appropriate phase angle voltage can be injected
Source.By changing its output voltage, the equivalent impedance of the transmission line of electricity can be changed, to realize power oscillation damping, inhibit secondary
The control targets such as synchronized oscillation, raising transient stability.Earthing mode when converting SSSC mode in pairs is as shown in Fig. 5.
The exchange side of inverter 2 is connect by series transformer T4 with Cascade System, and the system side winding of series transformer T4 is respectively only
Vertical, the valve side winding of series transformer T4 uses star connection.The 4th star neutral point of series transformer T4 is drawn, the 4th star
Shape neutral point carries out overvoltage protection by metal oxide arrester MOA4.After earthing or grounding means JD4 connects with isolation switch DS4
It is in parallel with MOA4.It should be pointed out that also using original metal oxide arrester MOA1, earthing or grounding means JD1 and isolation knife
Lock DS1 is connected with shunt transformer T4.
Attached drawing 6 gives equivalent zero sequence access when UPFC series transformer and shunt transformer are all grounded.Due to various
Reason usually has zero-sequence component (the equivalent zero sequence voltage component u in such as attached drawing 6 in the output voltage of inverter0), it is straight sharing
In the case where flowing bus, if forming a zero sequence access by grounding point, there will be the zero-sequence current (zero sequences in such as attached drawing 6
Electric current i0).Three-phase three-wire system inverter will eliminate zero-sequence current, might have many difficulties, need to carry out largely deeply to grind
Study carefully and analyzes.Meanwhile having zero-sequence current permanent communication when steady-state operation, the steady-state operation capacity of earthing or grounding means will be increased.Therefore,
When 2 combined operating of inverter 1 and inverter, only one suitable grounding point.
Attached drawing 7 is grounded when giving 2 combined operating of inverter 1 and inverter by earthing or grounding means JD1, and provides ginseng
Current potential is examined, attached drawing 8 is grounded when giving 2 combined operating of inverter 1 and inverter by earthing or grounding means JD2, and provides ginseng
Current potential is examined, when attached drawing 9 gives 2 respective independent operating of inverter 1 and inverter, inverter 1 is connect by earthing or grounding means JD1 realization
Ground, and reference potential is provided, inverter 2 is grounded by earthing or grounding means JD2, and provides reference potential.
For convertible static compensator and Research on Unified Power Quality Conditioner, situation is similar, no longer illustrates one by one.
Wherein, THE UPFC (unified power flow controller, UPFC) sums up mainly
Have:
(1) Line Flow is controlled, independently controls route active power and reactive power respectively；
(2) dynamic and transient stability for improving system, improve conveying capacity；
(3) regulating system working voltage and reactive balance condition improve system voltage stability；
(4) damping frequencies oscillation and system are waved；
(5) UPFC is the disadvantage is that unit capacity cost is higher.
Convertible static compensator (Convertible Static Compensator, CSC) is by multiple synchronous voltage sources
Inverter is constituted, and can control two Above Transmission Lines trends (active power, reactive power), voltage, impedance and phase angle simultaneously, and
It is able to achieve the device that power is converted between route.Convertible static compensator usually has following function:
(1) parallel reactive of static synchronous compensating device (Static Synchronous Compensator, STATCOM)
Compensation function；
(2) Static Synchronous Series compensation device (static series synchronous compensator, SSSC)
Series compensating function；
(3) THE UPFC (UPFC) function；
(4) control the above trend in two-lines road line between power flowcontrol (Interline Power Flow Control,
IPFC) function；
(5) any combination of above-mentioned 4 kinds of functions, and mutually convert.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field is although should be understood with reference to the above embodiments: still can be to a specific embodiment of the invention
It is modified or replaced equivalently, these are without departing from any modification of spirit and scope of the invention or equivalent replacement, in Shen
Within claims of the invention that please be pending.
Claims (6)
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| CN105680453B (en) * | 2016-03-14 | 2024-02-02 | 全球能源互联网研究院有限公司 | Improved parallel hybrid unified power flow controller |
| CN107204607B (en) * | 2016-03-18 | 2019-08-27 | 全球能源互联网研究院 | A Protection Method for Static Synchronous Series Compensator |
| CN107453326A (en) * | 2017-08-23 | 2017-12-08 | 全球能源互联网研究院 | The protection device and micro-capacitance sensor of a kind of grounding transformer |
| CN107919662A (en) * | 2017-11-27 | 2018-04-17 | 全球能源互联网研究院有限公司 | A kind of alternating current-direct current power grid earthing or grounding means and its control method |
| CN108092236A (en) * | 2017-11-29 | 2018-05-29 | 中国能源建设集团江苏省电力设计院有限公司 | A kind of overvoltage protection configuration system of THE UPFC |
| EP4012867A4 (en) * | 2019-08-08 | 2022-08-03 | Mitsubishi Electric Corporation | POWER CONVERSION SYSTEM |
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