CN204464987U - A kind of converter grounding system - Google Patents
A kind of converter grounding system Download PDFInfo
- Publication number
- CN204464987U CN204464987U CN201520209177.2U CN201520209177U CN204464987U CN 204464987 U CN204464987 U CN 204464987U CN 201520209177 U CN201520209177 U CN 201520209177U CN 204464987 U CN204464987 U CN 204464987U
- Authority
- CN
- China
- Prior art keywords
- converter
- winding
- connection
- transformer
- grounding system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 230000003068 static effect Effects 0.000 claims abstract description 52
- 238000004804 winding Methods 0.000 claims abstract description 49
- 238000011160 research Methods 0.000 claims abstract description 19
- 230000007935 neutral effect Effects 0.000 claims description 59
- 230000001360 synchronised effect Effects 0.000 claims description 27
- 238000002955 isolation Methods 0.000 claims description 18
- 229910044991 metal oxide Inorganic materials 0.000 claims description 14
- 150000004706 metal oxides Chemical class 0.000 claims description 10
- 101100130927 Caenorhabditis elegans moa-2 gene Proteins 0.000 claims description 7
- 101000887424 Mus musculus G-protein coupled receptor 143 Proteins 0.000 claims description 5
- -1 JD1 metal oxide Chemical class 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 9
- 230000010355 oscillation Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000000564 temperature-controlled scanning calorimetry Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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]
Abstract
The utility model relates to a kind of converter grounding system, and described converter comprises THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner; Described system comprises the converter that DC side is connected; The AC of converter described in one of them is in parallel with electric power system by a transformer; The reactor of the AC parallel in planetary connection of a described converter; The AC of converter described in another is by connecting another transformer and Cascade System.The technical scheme that the application provides is according to the feature of MMC technology, and fully take into account THE UPFC, the shunt transformer valve side windings such as convertible static compensator and Research on Unified Power Quality Conditioner can not adopt the particular/special requirement of star-like earthing mode, study and propose be applicable to THE UPFC, convertible static compensator, Research on Unified Power Quality Conditioner converter earthing mode.
Description
Technical field:
The utility model relates to power electronic device field, more specifically relates to a kind of converter grounding system.
Background technology:
The neutral point of electric power system refers to the neutral point of the transformer (or generator) of Y-connection.Neutral Grounding Modes of Power System divides neutral point effective grounding mode and neutral non-effective grounding mode two kinds.Neutral non-effective grounding mode can be divided into isolated neutral mode, neutral point low resistance grounding mode, neutral point High Resistance Grounding Mode and neutral point resonance neutral grounding.
Neutral point High Resistance Grounding Mode refers to have at least in system a wire or a bit through high resistance grounding, system equivalent zero sequence resistance is not more than the single-phase capacitive reactance that distributes over the ground of system, and system earth fault current is less than 10A.
Neutral point low resistance grounding mode refers to have at least in system a wire or a bit through low resistance earthing, system equivalent zero sequence resistance is not less than 2 times of system equivalent zero sequence induction reactance.
Neutral point resonance neutral grounding refers to have at least in system a wire or a bit through inductance ground connection, for the capacitive component of the single-phase fault current over the ground of bucking-out system.
The earthing mode of single converter has three kinds of selections usually, namely
(1) by the clamp resistance ground connection of direct-current polar.The advantage of this grounding scheme is simple, direct, effective, and cost is lower.For DC transmission system, shortcoming is by after direct current clamp resistance ground connection, and when AC line trackside normally runs, clamp resistance is a permanent load, and power loss is larger.In addition, after long-time running, the resistance value variations of resistor can cause direct-current polar voltage deviation.For THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner etc., situation is similar.
(2) Y winding is become through ground resistance earth by connection.Its advantage directly utilizes the neutral ground of transformer Y winding, and grounding apparatus is few; Its shortcoming relies on transformer Y winding to bear direct voltage and fault current under fault completely, proposes high requirement to transformer, and when transformer whole capacity is larger, it manufactures and designs comparatively difficulty.And this grounding scheme needs to net side and adopts earth-free winding type just can play the effect of isolation alternating current-direct current, must in the AC system of ground connection at neutral point, ground connection in the station also will considering other modes.
(3) Neutral Grounding through Resistance in Electrical is formed by reactor.The advantage of the program is that fault current shared by reactor, less to the pressure of connection transformer, reactor can also play the effect of limiting short-circuit current, weak point is for voltage levels, the reactive power that shunt reactor itself absorbs is larger, may be comparatively large to systematic influence, and manufacturing cost and volume also can be larger.
THE UPFC (unified power flow controller, UPFC) be configured for controlling the various parameters relevant with transmission line trend by synchronous voltage source converter, comprise the device of voltage, active power, reactive power, line impedance and voltage-phase.It has concentrated thyristor controlled series capacitor compensation arrangement (Thyristor Controlled Series Capacitor, TCSC), the various function of controlled series phase shifter, voltage regulator, static synchronous compensating device (static synchronous compensator, STATCOM) and feature.
Because convertible static compensator has good flexibility, modularity, extensibility and mutual transfer capability, therefore, be considered to third generation flexible AC transmission device.
Research on Unified Power Quality Conditioner (Unified Power Quality Conditioner, UPQC) be the mixed power quality control device integrating Series FPB and parallel FPB compensation arrangement, for solving quality of voltage problem in power distribution network and current quality problem, it is a kind of device of comprehensive regulation power quality problem.Its parallel units is equivalent to the controllable current source that is parallel to electrical network, provides required harmonic current and reactive current to load, thus improves net side power factor; Its series unit is equivalent to the controllable voltage source be series between system and load, the difference of real-Time Compensation nominal voltage and system virtual voltage, thus provides quality power for load.
THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner have two converters, and have corresponding transformer, complete the functions such as isolation and transformation.Obviously, one of critical problem that earthing mode is THE UPFC, must first solve in the engineering such as convertible static compensator and Research on Unified Power Quality Conditioner, it provides reference potential for whole system, also be the basis of over-voltage studies, insulation coordination design, a very important link in system especially.
From Siemens Company, modularization multi-level converter topology (modular multilevelconverters is proposed, MMC) after, first converter based on MMC technology obtains engineer applied and popularization in DC transmission engineering, MMC technology does not need large number of insulated gate bipolar transistor (insulated gate bipolar transistor, IGBT) valve directly in series, greatly reduce the technical difficulty of high-power converter, thus make MMC technology gradually in THE UPFC, many research is obtained in convertible static compensator and Research on Unified Power Quality Conditioner.
Adopt the MMC-HVDC DC side of half-bridge structure be short-circuited fault time, full-controlled switch device as IGBT antiparallel fly-wheel diode easily form fault point and be fed to loop with the energy that AC system is directly communicated with, converter action cannot be relied on merely to complete the removing of DC side fault current.Put into operation at present, adopt the MMC-HVDC engineering of half-bridge structure mostly to adopt cable laying circuit, to reduce DC Line Fault probability of happening, but involve great expense, economic benefit is slightly poor.
For the THE UPFC of modularization multi-level converter composition, convertible static compensator and Research on Unified Power Quality Conditioner, system dc side does not have the capacitor of centralized arrangement, but adopts the arrangement of the distributed capacitor in each power model of brachium pontis.In addition, because prior art exists the inherent shortcoming that effectively cannot process MMC converter DC Line Fault, as being grounded by the DC side of MMC converter, then the probability that bipolar short trouble occurs DC side can be increased.
For the electric power system of 110kV and above, if adopt isolated neutral system, so risings be line voltage by the voltage of healthy phases, and the insulation level of power transmission and transforming equipment is considered according to the line voltage of electrical network with regard to needs, thus adds project cost.Otherwise adopt solidly earthed neutral system, the voltage of healthy phases is constant, and so the insulation level of power transmission and transforming equipment only needs to consider according to the phase voltage of electrical network, thus reduces project cost.And in the electric power system of 60kV and following electric pressure, the insulation level of electrical network is not principal contradiction usually, so great majority adopt isolated neutral or the mode through grounding through arc.These should be the electric power system employing solidly earthed neutral systems of 110kV and above, and the electric power system of 60kV and following electric pressure adopts the reason of isolated neutral or compensated distribution network.For the electric power system of 110kV and above, THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner shunt transformer system side winding can adopt star to connect, and neutral ground.In order to isolate influencing each other of connection transformer two ends zero-sequence component, connection transformer is generally designed to the connection eliminating zero-sequence component, and both sides must have side to be isolated neutral system.So, THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner shunt transformer valve side winding just can not adopt star-like earthing mode.
How according to the feature of MMC technology, and fully take into account THE UPFC, the shunt transformer valve side windings such as convertible static compensator and Research on Unified Power Quality Conditioner can not adopt the particular/special requirement of star-like earthing mode, study and propose be applicable to THE UPFC, convertible static compensator, Research on Unified Power Quality Conditioner converter earthing mode, be the problem that the application should solve.
Utility model content:
The purpose of this utility model is to provide a kind of converter grounding system, the grounding system of the converter of applicable THE UPFC, convertible static compensator, Research on Unified Power Quality Conditioner.
For achieving the above object, the utility model by the following technical solutions: a kind of converter grounding system, described converter comprises THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner; Described system comprises the converter that DC side is connected; The AC of converter described in one of them is in parallel with electric power system by a transformer; The reactor of the AC parallel in planetary connection of a described converter; The AC of converter described in another is by connecting another transformer and Cascade System.
A kind of converter grounding system that the utility model provides, a described transformer comprises electric power system side and adopts the winding of star connection and valve side to adopt the winding of star connection or delta connection; The neutral ground of described electric power system side winding; Described valve side adopts the star neutral point of the winding of star connection not draw.
A kind of converter grounding system that the utility model provides, the neutral point of described reactor is by earthing device JD1 ground connection; Described earthing device JD1 metal oxide arrester MOA1 in parallel.
Another preferred a kind of converter grounding system that the utility model provides, another transformer described comprises electric power system side, and independently winding and valve side adopt the winding of star connection separately; Described valve side adopts the star neutral point of the winding of star connection to draw, and neutral point carries out overvoltage protection by metal oxide arrester MOA2.
The preferred a kind of converter grounding system again that the utility model provides, in parallel with described MOA2 after earthing device JD2 connects with isolation switch DS2.
Another preferred a kind of converter grounding system that the utility model provides, when a described converter and another converter independently run, described isolation switch DS2 closes a floodgate, and a described converter by JD1 ground connection, and provides reference potential; Another converter described by JD2 ground connection, and provides reference potential; When a described converter and another converter cooperation, described isolation switch DS2 disconnects, and described grounding system is by described earthing device JD1 ground connection.
Another preferred a kind of converter grounding system that the utility model provides, another transformer described is provided with the tertiary winding adopting delta connection.
Another preferred a kind of converter grounding system that the utility model provides, when described grounding system is by realizing the converter cooperation of two static synchronous compensating device as the grounding system of convertible static compensator, another transformer described is in parallel with described electric power system; Another transformer described comprises electric power system side and adopts the winding of star connection and valve side to adopt the winding of star connection or delta connection; The neutral ground of described electric power system side winding; Described valve side adopts the star neutral point of the winding of star connection not draw; Described grounding system by described earthing device JD1 ground connection, and provides reference potential.
Another preferred a kind of converter grounding system that the utility model provides, when described pair of static synchronous compensating device converter separately independent operating time, the valve side of another transformer described, the AC of another converter described and another reactor are in parallel; Another reactor described is Y-connection, and its neutral point is by earthing device JD3 ground connection; Described earthing device JD3 is in parallel with metal oxide arrester MOA3; Described grounding system by described earthing device JD1 and earthing device JD3 ground connection, and provides reference potential.
Another preferred a kind of converter grounding system that the utility model provides, when described grounding system is by realizing the converter cooperation of two Static Synchronous Series compensation arrangement as the grounding system of convertible static compensator, a described transformer is connected with described electric power system; A described transformer comprises electric power system side, and independently winding and valve side adopt star connection or adopt the winding of delta connection separately; Winding neutral point during described employing star connection is not drawn; The neutral point of described reactor is by earthing device JD1 ground connection; Described earthing device JD1 metal oxide arrester MOA1 in parallel; Described isolation switch DS2 disconnects, and described grounding system is by described earthing device JD1 ground connection.
Another preferred a kind of converter grounding system that the utility model provides, when described pair of Static Synchronous Series compensation arrangement converter separately independent operating time, described isolation switch DS2 closes a floodgate, and one of them converter described by JD1 ground connection, and provides reference potential; Another converter described by JD2 ground connection, and provides reference potential.
With immediate prior art ratio, the utility model provides technical scheme to have following excellent effect
1, the earthing mode strong adaptability that the technical scheme that the utility model provides proposes, applicable THE UPFC, convertible static compensator, Research on Unified Power Quality Conditioner etc.;
2, the earthing device JD of technical scheme that the utility model provides is furnished with corresponding isolation switch DS, facilitates the input of earthing device JD and exits, according to the operational mode of above-mentioned different device converter, realizing the various combination of earthing mode flexibly easily;
3, the metal oxide arrester MOA of technical scheme that the utility model provides directly is connected with transformer neutral point, and no matter whether isolation switch DS closes a floodgate, and transformer neutral point is subject to the protection of metal oxide arrester MOA all the time;
4, the technical scheme that the utility model provides is avoided being grounded by direct current clamp resistance effectively, does not increase the probability that bipolar short trouble occurs DC side;
5, the technical scheme that the utility model provides adopts an earth point, avoid forming a zero sequence path by multiple earth point, thus having zero-sequence current, three-phase three-wire system converter will eliminate all difficulties that zero-sequence current needs extra control device to bring.
Accompanying drawing explanation
The converter earthing mode schematic diagram of the THE UPFC of the technical scheme that Fig. 1 provides for the utility model;
The earthing device schematic diagram of the technical scheme that Fig. 2 provides for the utility model;
The THE UPFC series side of the technical scheme that Fig. 3 provides for the utility model has the earthing mode schematic diagram during tertiary winding;
Equivalent zero sequence path schematic diagram during the converter earthing mode of the THE UPFC of the technical scheme that Fig. 4 provides for the utility model;
The technical scheme that Fig. 5 provides for the utility model do not require series side isolated operation time earthing mode schematic diagram;
The converter of the technical scheme that Fig. 6 provides for the utility model separately independent operating time earthing mode schematic diagram;
By JD1 ground connection schematic diagram during two static synchronous compensating device cooperation of the technical scheme that Fig. 7 provides for the utility model;
Two static synchronous compensating devices of the technical scheme that Fig. 8 provides for the utility model separately independent operating time earthing mode schematic diagram;
Earthing mode schematic diagram during two Static Synchronous Series compensation arrangement cooperation of the technical scheme that Fig. 9 provides for the utility model;
Two Static Synchronous Series compensation arrangements of the technical scheme that Figure 10 provides for the utility model separately independent operating time earthing mode schematic diagram.
Embodiment
Below in conjunction with embodiment, utility model is described in further detail.
Embodiment 1:
The utility model of this example provides a kind of converter grounding system, described system can not adopt the requirement of star-like earthing mode for the feature of the MMC converter of half-bridge structure and shunt transformer valve side winding, for THE UPFC, present applicant proposes the earthing mode of applicable THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner, as shown in Figure 1.Wherein, the DC side of converter 1 is connected with the DC side of converter 2.Converter 1/ converter 2 can be converter, the converter of H bridge cascade, the converter of striding capacitance, the converter of diode clamp of MMC.The AC of converter 1 is connected in parallel by shunt transformer T1 and system.Shunt transformer T1 only has two windings, and the winding of shunt transformer T1 system side adopts star connection, and neutral ground.The winding of shunt transformer T1 valve side can adopt star connection or adopt delta connection, and during employing star connection, star neutral point is not drawn.The reactor of the AC parallel in planetary connection of converter 1, neutral point is by earthing device JD1 ground connection, and metal oxide arrester MOA1 is in parallel with earthing device JD1.The AC of converter 2 is connected with Cascade System by series transformer T2, and the system side winding of series transformer T2 is independent separately, and the valve side winding of series transformer T2 adopts star connection.Series transformer T2 star neutral point is drawn, and neutral point carries out overvoltage protection by metal oxide arrester MOA2.It is in parallel with MOA2 after earthing device JD2 connects with isolation switch DS2.
It should be noted that, when Practical Project is implemented, have many isolation switchs, circuit breaker, current measure device, voltage measuring apparatus.Here do not draw these equipment, when not representing the actual enforcement of engineering, there are not these equipment.
The every of transmission line relatively has capacitance current, and therefore, neutral ground adopts neutral point resonance neutral grounding sometimes, for the capacitive component of the single-phase fault current over the ground of bucking-out system.Also there is stray capacitance over the ground in converter 1/ converter 2, but compared with circuit, little many, therefore, do not need to adopt neutral point resonance neutral grounding.Earthing device JD1/JD2 in accompanying drawing 5 can pass through grounding through resistance, as accompanying drawing 2 a) as shown in, also can direct ground connection, the b as accompanying drawing 2) as shown in.As earthing device JD2 adopts direct ground connection, and disconnecting link DS2 is in "on" position always, then corresponding metal oxide arrester MOA2 can omit.
As shown in Figure 1, the system side winding of series transformer T2 is independent separately, and valve side adopts star-like ground connection, and zero-sequence component does not have corresponding path, may serve difficulty to the design band of transformer.Can increase the tertiary winding of transformer, and adopt delta connection, corresponding earthing mode as shown in Figure 3.
For the converter earthing mode of THE UPFC in accompanying drawing 1, the embodiment of earthing mode is described in detail and is described.
Fig. 4 shows equivalent zero sequence path during UPFC series transformer ground connection.Due to a variety of causes, usually there is zero-sequence component in the output voltage of converter (as the equivalent zero sequence voltage component u in accompanying drawing 4
0), when general DC busbar, if form a zero sequence path by earth point, then have zero-sequence current (as the zero-sequence current i in accompanying drawing 4
0).Three-phase three-wire system converter will eliminate zero-sequence current, may have many difficulties, needs to carry out a large amount of further investigations and analysis.Meanwhile, during steady operation, there is zero-sequence current permanent communication, will the steady operation capacity of earthing device be increased.Therefore, when converter 1 and converter 2 cooperation, an earth point should be only had.
Require converter 1 isolated operation, require converter 1 and converter 2 cooperation, but when not needing converter 2 isolated operation, the earthing mode as accompanying drawing 5 can be adopted.Earthing device JD2 and disconnecting link DS2 can be omitted.If when requiring converter 1 and converter 2 isolated operation, then can not omit earthing device JD2 and disconnecting link DS2, give in accompanying drawing 6 converter 1 and converter 2 separately independent operating time earthing mode.
Convertible static compensator is switched by suitable isolation switch and transformer for subsequent use converts two static synchronous compensating device operational mode to.Static synchronous compensating device is made up of the voltage source converter of connecting system in parallel, can send or the synchronous reactive power source of silent oscillation of absorbing reactive power.Can control some parameter (as voltage) of electric power system by changing its output.Once novel static passive compensation device (ASVC), reacance generator (SVG), static compensator (STATCON) etc. were called as.Shown in earthing mode accompanying drawing 7 when converting two STATCOM cooperation to.As shown in Figure 7, two STATCOM operational mode needs a new shunt transformer T3, and during cooperation, whole system only has an earth point, is realized, and provide reference potential by earthing device JD1.As require two STATCOM separately independent operating time, then converter 1 and converter 2 need an earth point separately, fig. 8 provides two STATCOM separately independent operating time earthing mode.As shown in Figure 8, the reactor of the AC parallel in planetary connection of converter 2, neutral point is by earthing device JD3 ground connection, and metal oxide arrester MOA3 is in parallel with earthing device JD3.Converter 1 is grounded by JD1, and provides reference potential.Converter 2 is grounded by JD3, and provides reference potential.
Convertible static compensator is switched by suitable isolation switch and transformer for subsequent use converts two Static Synchronous Series compensation arrangement (static series synchronous compensator, SSSC or S to
3c) operational mode.Static Synchronous Series compensation arrangement and Cascade System, based on voltage source converter (the Voltage Source Converter that can turn off power electronic device composition, VSC), one can be injected and become the synchronous reactive power source of silent oscillation of suitable phase angle voltage with line current.By changing its output voltage, the equiva lent impedance of this transmission line can be changed, thus realize the control objectives such as power oscillation damping, suppression sub-synchronous oscillation, raising transient stability.Earthing mode when converting two SSSC cooperation to as shown in Figure 9.The AC of converter 1 is connected with Cascade System by series transformer T4, the system side winding of series transformer T4 is independent separately, the valve side winding of series transformer T4 can adopt star connection, also can adopt delta connection, and during employing star connection, neutral point is not drawn.DS2 separating brake, guarantees that whole system only has an earth point.Converter 1 and converter 2 are grounded by JD1, and provide reference potential.Convert to two SSSC separately independent operating time earthing mode as shown in Figure 10.DS2 closes a floodgate, and guarantees converter 1 and each own respective earth point of converter 2.Converter 1 is grounded by JD1, and provides reference potential.Converter 2 is grounded by JD2, and provides reference potential.
Wherein, THE UPFC (unified power flow controller, UPFC) sums up and mainly contains:
(1) control circuit trend, distinguishes control circuit active power and reactive power independently;
(2) improve the dynamic of system and transient stability, improve conveying capacity;
(3) regulating system working voltage and reactive balance condition, improves system voltage stabilizes;
(4) damping frequencies oscillation and system are waved;
(5) UPFC shortcoming is that unit capacity cost is higher.
Convertible static compensator (Convertible Static Compensator, CSC) be made up of multiple synchronous voltage source converter, two Above Transmission Lines trends (active power, reactive power), voltage, impedance and phase angle can be controlled simultaneously, and the device of power transfer between circuit can be realized.Convertible static compensator has following function usually:
(1) the parallel reactive compensate function of static synchronous compensating device (Static Synchronous Compensator, STATCOM);
(2) series compensating function of Static Synchronous Series compensation arrangement (static series synchronous compensator, SSSC);
(3) THE UPFC (UPFC) function;
(4) power flowcontrol (Interline Power Flow Control, IPFC) function between the line controlling two-lines road above trend;
(5) any combination of above-mentioned 4 kinds of functions, and mutually change.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; although those of ordinary skill in the field are to be understood that with reference to above-described embodiment: still can modify to embodiment of the present utility model or equivalent replacement; these do not depart from any amendment of the utility model spirit and scope or equivalent replacement, are all applying within the claims of the present utility model awaited the reply.
Claims (11)
1. a converter grounding system, described converter comprises THE UPFC, convertible static compensator and Research on Unified Power Quality Conditioner; It is characterized in that: described system comprises the converter that DC side is connected; The AC of converter described in one of them is in parallel with electric power system by a transformer; The reactor of the AC parallel in planetary connection of a described converter; The AC of converter described in another is by connecting another transformer and Cascade System.
2. a kind of converter grounding system as claimed in claim 1, is characterized in that: a described transformer comprises electric power system side and adopts the winding of star connection and valve side to adopt the winding of star connection or delta connection; The neutral ground of described electric power system side winding; Described valve side adopts the star neutral point of the winding of star connection not draw.
3. a kind of converter grounding system as claimed in claim 2, is characterized in that: the neutral point of described reactor is by earthing device JD1 ground connection; Described earthing device JD1 metal oxide arrester MOA1 in parallel.
4. a kind of converter grounding system as claimed in claim 3, is characterized in that: another transformer described comprises electric power system side, and independently winding and valve side adopt the winding of star connection separately; Described valve side adopts the star neutral point of the winding of star connection to draw, and neutral point carries out overvoltage protection by metal oxide arrester MOA2.
5. a kind of converter grounding system as claimed in claim 4, is characterized in that: in parallel with described MOA2 after earthing device JD2 connects with isolation switch DS2.
6. a kind of converter grounding system as claimed in claim 5, is characterized in that: when a described converter and another converter independently run, described isolation switch DS2 closes a floodgate, and a described converter by JD1 ground connection, and provides reference potential; Another converter described by JD2 ground connection, and provides reference potential; When a described converter and another converter cooperation, described isolation switch DS2 disconnects, and described grounding system is by described earthing device JD1 ground connection.
7. a kind of converter grounding system as claimed in claim 5, is characterized in that: another transformer described is provided with the tertiary winding adopting delta connection.
8. a kind of converter grounding system as claimed in claim 5, it is characterized in that: when described grounding system is by realizing the converter cooperation of two static synchronous compensating device as the grounding system of convertible static compensator, another transformer described is in parallel with described electric power system; Another transformer described comprises electric power system side and adopts the winding of star connection and valve side to adopt the winding of star connection or delta connection; The neutral ground of described electric power system side winding; Described valve side adopts the star neutral point of the winding of star connection not draw; Described grounding system by described earthing device JD1 ground connection, and provides reference potential.
9. a kind of converter grounding system as claimed in claim 8, it is characterized in that: when described pair of static synchronous compensating device converter separately independent operating time, the valve side of another transformer described, the AC of another converter described and another reactor are in parallel; Another reactor described is Y-connection, and its neutral point is by earthing device JD3 ground connection; Described earthing device JD3 is in parallel with metal oxide arrester MOA3; Described grounding system by described earthing device JD1 and earthing device JD3 ground connection, and provides reference potential.
10. a kind of converter grounding system as claimed in claim 5, it is characterized in that: when described grounding system is by realizing the converter cooperation of two Static Synchronous Series compensation arrangement as the grounding system of convertible static compensator, a described transformer is connected with described electric power system; A described transformer comprises electric power system side, and independently winding and valve side adopt star connection or adopt the winding of delta connection separately; Winding neutral point during described employing star connection is not drawn; The neutral point of described reactor is by earthing device JD1 ground connection; Described earthing device JD1 metal oxide arrester MOA1 in parallel; Described isolation switch DS2 disconnects, and described grounding system is by described earthing device JD1 ground connection.
11. a kind of converter grounding systems as claimed in claim 10, it is characterized in that: when described pair of Static Synchronous Series compensation arrangement converter separately independent operating time, described isolation switch DS2 closes a floodgate, and one of them converter described is grounded by JD1, and provides reference potential; Another converter described by JD2 ground connection, and provides reference potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520209177.2U CN204464987U (en) | 2015-04-09 | 2015-04-09 | A kind of converter grounding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520209177.2U CN204464987U (en) | 2015-04-09 | 2015-04-09 | A kind of converter grounding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204464987U true CN204464987U (en) | 2015-07-08 |
Family
ID=53671814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520209177.2U Withdrawn - After Issue CN204464987U (en) | 2015-04-09 | 2015-04-09 | A kind of converter grounding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204464987U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734134A (en) * | 2015-04-09 | 2015-06-24 | 国家电网公司 | Inverter grounding system |
| CN110148945A (en) * | 2019-05-15 | 2019-08-20 | 全球能源互联网研究院有限公司 | A kind of ground connection isolating device based on low frequency power transmission system |
-
2015
- 2015-04-09 CN CN201520209177.2U patent/CN204464987U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734134A (en) * | 2015-04-09 | 2015-06-24 | 国家电网公司 | Inverter grounding system |
| CN104734134B (en) * | 2015-04-09 | 2019-06-28 | 国家电网公司 | A kind of inverter earthed system |
| CN110148945A (en) * | 2019-05-15 | 2019-08-20 | 全球能源互联网研究院有限公司 | A kind of ground connection isolating device based on low frequency power transmission system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104734134A (en) | Inverter grounding system | |
| CN102983577B (en) | A kind of convertible static compensator adopting modular multilevel converter structure | |
| CN102983584B (en) | A kind of THE UPFC for unbalanced system | |
| Tyll et al. | Historical overview on dynamic reactive power compensation solutions from the begin of AC power transmission towards present applications | |
| CN102969708B (en) | Flow controller between a kind of line based on modular multilevel converter structure | |
| CN204349457U (en) | A kind of reactive power compensation filtering device | |
| CN104410063A (en) | Cascaded unified electric energy quality regulating system | |
| CN105375454A (en) | Short circuit fault current limiter | |
| CN104767191A (en) | Converter grounding system | |
| CN106899025A (en) | A kind of comprehensive compensation type alternating current steady voltage plug | |
| CN204464987U (en) | A kind of converter grounding system | |
| CN106130020A (en) | A kind of series compensation device being applicable to double-circuit line | |
| CN206673592U (en) | A kind of comprehensive compensation type alternating current steady voltage plug | |
| CN110729717B (en) | Parallel traction compensation system for double full-bridge back-to-back converter | |
| CN102496932A (en) | Parallel voltage sag compensation device | |
| CN202930956U (en) | Unified power flow controller used in unbalanced system | |
| CN202183601U (en) | Differentiation-compensated electric energy quality treatment device for electrified railway | |
| CN100527559C (en) | Line-to-line voltage compensation type current limiting energy storage circuit | |
| Babu et al. | Power upgrading of transmission line by combining AC–DC transmission | |
| CN204464986U (en) | A kind of converter grounding system | |
| US11159021B2 (en) | Flexible reactive power compensation | |
| CN102280880A (en) | Electrical energy quality management device of electrified railway with differentiated compensation | |
| Habibolahzadeh et al. | Rating reduction and optimized DC-link voltage of the HPQC in co-phase traction power system | |
| CN205945059U (en) | Cascade compensation device suitable for two loop line ways | |
| CN205986167U (en) | Cascade compensation device suitable for many loop lines way |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150708 Effective date of abandoning: 20190628 |