CN110492491A - A kind of unit compensated transmission system - Google Patents
A kind of unit compensated transmission system Download PDFInfo
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- CN110492491A CN110492491A CN201810463684.7A CN201810463684A CN110492491A CN 110492491 A CN110492491 A CN 110492491A CN 201810463684 A CN201810463684 A CN 201810463684A CN 110492491 A CN110492491 A CN 110492491A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims description 43
- 238000013016 damping Methods 0.000 claims description 38
- 229910044991 metal oxide Inorganic materials 0.000 claims description 28
- 150000004706 metal oxides Chemical class 0.000 claims description 28
- 238000004804 winding Methods 0.000 claims description 24
- 230000007935 neutral effect Effects 0.000 claims description 13
- 230000009466 transformation Effects 0.000 claims description 12
- 238000010248 power generation Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 15
- 230000005611 electricity Effects 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 16
- 238000002955 isolation Methods 0.000 description 7
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 208000010086 Hypertelorism Diseases 0.000 description 1
- 206010020771 Hypertelorism of orbit Diseases 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002927 oxygen compounds Chemical class 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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
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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
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The embodiment of the present invention provides a kind of unit compensated transmission system, the system comprises: compensator with series capaci tance, the compensator with series capaci tance series connection access is between the system busbar that generator and the generator connect.Unit compensated transmission system provided in an embodiment of the present invention can be improved the ability to transmit electricity and maintenance level of unit, and investment is not high, convenient for safeguarding.
Description
Technical field
The present invention relates to technical field of power systems more particularly to a kind of unit compensated transmission systems.
Background technique
In generator access system and power system stability field, after Synchronous generator access system, due to
Power transmission hypertelorism is excessively weak with interconnection, and the maintenance level of Synchronous generator is not able to satisfy relevant criterion requirement
When, it usually needs maintenance level is improved by certain method and measure.
It is existing extensive to improve power system stability level to increase series capacitor compensation on the transmission line of electricity that power plant sends out
Using, but these applications are on long-distance transmission line, are that collateral security power plant whole electric power sends out the angle unification needed
Consider and proposes and apply.
Fig. 1 a is the basic framework schematic diagram of conventional line series capacitor compensation transmission of electricity in the prior art.More of power plant
(such as four) generator U1-U4 accesses system busbar after step-up transformer T1-T4 boosting respectively, on conveying circuit
It concentrates and increases compensator with series capaci tance SC0, to improve the stability of route ability of supplying electric power and generator.
Fig. 1 b is the single-phase wiring schematic diagram of conventional line compensator with series capaci tance.It can be seen that single-phase series capacitor
Compensating equipment mainly includes capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D, disconnecting switch
G1-G3 and spark gap GAP.
However, there is also many deficiencies in the application for classical tandem capacitance compensation in the prior art, it is main to conclude
There is the following aspects:
Firstly, since transmission line of electricity is often multiloop, when increasing compensator with series capaci tance on the transmission line, it is necessary to consider
A time overload problem even after twice line faults, thus increase in compensator with series capaci tance the scale of capacitor group and
Total investment of engineering；And since compensator with series capaci tance is concentrated setting in systems, it is also possible to can be brought to unit negatively
It influences, or even causes scheme invalid.
Secondly, the access of conventional line compensator with series capaci tance system operation mode in need of consideration, failure mode are more
And it is complicated, therefore high requirement is proposed to compensator with series capaci tance, also increase design difficulty and equipment requirement.
Further more, conventional line compensator with series capaci tance must be placed on high-voltage isulation platform, construction high pressure is increased
The investment of insulated platform.
Summary of the invention
The embodiment of the present invention provides a kind of unit compensated transmission system, can reduce equipment total scale and capacity, reduce and throw
Money, design application are more flexible.
The embodiment of the present invention provides a kind of unit compensated transmission system, the system comprises: compensator with series capaci tance, institute
Compensator with series capaci tance series connection access is stated between the system busbar that generator and the generator connect.
Preferably, if the generator is more, at least a generator and an at least generator
Series connection access compensator with series capaci tance between the system busbar of connection.
Preferably, the compensator with series capaci tance is connected to the step-up transformer and the generator of the generator
Between the system busbar of step-up transformer connection；Or the compensator with series capaci tance is connected to the generator and the power generation
Between the system busbar of machine connection.It preferably, include that three single-phase series capacitance compensations are set in the compensator with series capaci tance
Standby, the single-phase series capacitance compensation equipment is separately mounted on insulated platform.
Preferably, the compensator with series capaci tance is connected to the generator and its step-up transformer high voltage power transmission circuit
Low-pressure end；Or the compensator with series capaci tance is connected to the low-pressure end in the generator transmission circuit.Wherein, the series connection
Electric capacity compensation device is connected to the low-pressure end of the step-up transformer output loop of the generator, i.e. step-up transformer high-voltage winding
Between the neutral point that low-pressure end is connected with three；Or the compensator with series capaci tance is connected to the generator output loop
Low-pressure end, i.e., between the neutral point that the low-pressure end of the described generator three-phase windings is connected with three.Preferably, the series capacitance
It include three single-phase series capacitance compensation equipment in compensation device, the single-phase series capacitance compensation equipment is separately mounted to ground
On.
Preferably, the single-phase series capacitance compensation equipment includes:
Capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D and disconnecting switch G1-G3；Its
In, the by-pass switch BP and the damping circuit D of series connection, with the capacitor group C, the metal oxide variable resistance
Both ends after device MOV is connected in parallel are connected the disconnecting switch G1 and G2 respectively, constitute the first branch；The disconnecting switch G3 with
The first branch is connected in parallel；Or
Capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D and disconnecting switch G1-G2；Its
In, the capacitor group C and the metal oxide varistor MOV be connected in parallel after both ends connect respectively disconnecting switch G1 and
G2 constitutes second branch；The by-pass switch BP and damping circuit D being connected in series are connected in parallel with the second branch；Or
Capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D and disconnecting switch G1-G2；Its
In, the capacitor group C and the metal oxide varistor MOV be connected in parallel after both ends connect respectively disconnecting switch G1,
Damping circuit D and disconnecting switch G2 constitutes third branch；The by-pass switch BP is connect with the third branch circuit parallel connection.
Preferably, the compensator with series capaci tance by impedance transformation and isolating transformer be connected in series in generator with
Between the system busbar of the generator connection.
In conclusion unit compensated transmission system of the embodiment of the present invention, passes through the system busbar accessed in generator with it
The series connection of lead wire road accesses a set of compensator with series capaci tance, and according to system situation, compensator with series capaci tance can be concatenated
High-voltage end in unit access system circuit can also be serially connected in the low-pressure end in unit access system circuit.When generator passes through
When step-up transformer access system bus, the compensator with series capaci tance can be serially connected on step-up transformer high-voltage connection,
The low-pressure end of step-up transformer output loop can also be serially connected in when for new-built unit or satisfying the requirements, i.e. step-up transformer is high
Between the low-pressure end and three joining neutral points for pressing winding, moreover, in this case can be directly by compensator with series capaci tance
Single-phase series capacitance compensation equipment arrangement on the ground, be not necessarily to high-voltage isulation platform, with reduce investment.Since the present invention is implemented
Example compensator with series capaci tance is respectively configured by unit, so in practical applications can be for the concrete condition point of unit
Not She Ji compensator with series capaci tance, to reduce negative effect of the compensator with series capaci tance to unit, while can also be with needle
Unit actual conditions are installed with different compensator with series capaci tance, is realized more flexible.
Further, compared with the classical tandem Electric capacity compensation device that the prior art connects on the transmission line, the present invention
The unit compensated transmission system that embodiment provides does not need spark gap and its control system, simplifies system and constitutes, reduces investment
Cost improves system reliability.In addition, compensator with series capaci tance is also provided with by-pass switch and isolation switch, to run
Maintenance.Unit compensated transmission system provided in an embodiment of the present invention can although increasing the quantity of compensator with series capaci tance
With solve all technical problems exist in the prior art, can also be greatly lowered capacitor group in compensator with series capaci tance,
The total capacity of the capital equipments such as metal oxide varistor, so that gross investment be greatly lowered.Due to compensator with series capaci tance
For the operating current of middle capacitor it is only necessary to consider the maximum operating currenbt of generating set, there is no need to consider overload capacity.Due to
Generator low-pressure side is usually enclosed busbar, may not need and considers that enclosed busbar failure is possible, in this way, the embodiment of the present invention provides
Unit compensated transmission system it is much smaller compared with prior art short circuit current in need of consideration, thus, metal oxide variable resistance
The configuration scale of device, other equipment correlation nominal parameter are much smaller.
In addition, unit compensated transmission system provided in an embodiment of the present invention can also greatly improve unit static state and
Transient Stability Level, especially during the external system failure, the metal oxide varistor in compensator with series capaci tance exists
A large amount of generator power is absorbed while protective condenser is against damages, is put into and is exited no-delayly during playing failure
The effect of braking resistor, to increase substantially unit Transient Stability Level.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 a is the basic framework schematic diagram of conventional line series capacitor compensation transmission of electricity in the prior art；
Fig. 1 b is the single-phase wiring schematic diagram of conventional line compensator with series capaci tance in the prior art；
Fig. 2 a is a kind of basic framework schematic diagram of series capacitor compensation of embodiment of the present invention transmission of electricity；
Fig. 2 b is another basic framework schematic diagram of series capacitor compensation of embodiment of the present invention transmission of electricity；
Fig. 3 a is a kind of on-position schematic diagram of units connected in series Electric capacity compensation device of the embodiment of the present invention；
Fig. 3 b is another on-position schematic diagram of units connected in series Electric capacity compensation device of the embodiment of the present invention；
Fig. 3 c is a kind of access of the units connected in series Electric capacity compensation device of the embodiment of the present invention Jing Guo impedance transformation and isolating transformer
Position view;
Fig. 4 a is a kind of specific wiring schematic diagram of units connected in series Electric capacity compensation device single-phase equipment of the embodiment of the present invention；
Fig. 4 b is the specific wiring schematic diagram of another kind of single-phase equipment in units connected in series Electric capacity compensation device of the embodiment of the present invention；
Fig. 4 c is another specific wiring schematic diagram of single-phase equipment in units connected in series Electric capacity compensation device of the embodiment of the present invention；
Fig. 5 a is the high-voltage winding low-voltage that unit single-phase series capacitance compensation equipment of the embodiment of the present invention seals in step-up transformer
A kind of specific wiring schematic diagram when end or generator windings low-voltage end；
Fig. 5 b is the high-voltage winding low-voltage that unit single-phase series capacitance compensation equipment of the embodiment of the present invention seals in step-up transformer
The specific wiring schematic diagram of another kind when end or generator windings low-voltage end；
Fig. 5 c is the high-voltage winding low-voltage that unit single-phase series capacitance compensation equipment of the embodiment of the present invention seals in step-up transformer
Another specific wiring schematic diagram when end or generator windings low-voltage end.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Unit compensated transmission system provided in an embodiment of the present invention, comprising: compensator with series capaci tance, the series capacitance
Compensation device series connection access is between the system busbar that generator and the generator connect.Wherein, if the generator is more
Platform, then access series electrical of connecting between the system busbar that an at least generator is connected with an at least generator
Hold compensation device.
First embodiment
It as shown in Figure 2 a, is a kind of basic framework schematic diagram of units connected in series of embodiment of the present invention capacitance compensation transmission of electricity.Wherein, it goes here and there
Connection Electric capacity compensation device is connected to the system busbar that the step-up transformer of generator is connect with the step-up transformer of the generator
Between high-tension line on.Specifically, the generator U1-U4 that power plant is different, boosts by step-up transformer T1-T4 respectively
Afterwards, then after being respectively connected to compensator with series capaci tance SC1-SC4, access system bus.As it can be seen that the embodiment of the present invention, in order to mention
High ability of supplying electric power and set steady can concatenate access string respectively on the high-voltage connection of every generator access system bus
Join Electric capacity compensation device.
It should be noted that in practical applications, can according to the case where generator unit U1~U4 and its maintenance level,
Compensator with series capaci tance SC1~SC4 can be identical, can also be different；Series capacitance can be installed with part of generating units
Compensation device, can also whole units be respectively mounted compensator with series capaci tance.
It optionally, respectively include the identical unit single-phase series of three-phase in the compensator with series capaci tance SC1-SC4
Capacitance compensation equipment, a, b, c phase unit single-phase series capacitance compensation equipment SCa, SCb and SCc as shown in Figure 3a.The series connection
Each be connected in series capacitance compensation equipment SCa, SCb or the SCc of Electric capacity compensation device SC1~SC4, can be according to operation and maintenance
Requirement on flexibility is different, using the mode of connection of such as Fig. 4 a, 4b or 4c.Wherein, as in the mode of connection of Fig. 4 a, unit is single-phase
Series capacitor compensation equipment includes: capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D, and
Disconnecting switch G1-G3；Wherein, the by-pass switch BP and the damping circuit D of series connection, with the capacitor group C, institute
It states the both ends after metal oxide varistor MOV is connected in parallel to connect respectively the disconnecting switch G1 and G2, constitutes the first branch；
The disconnecting switch G3 is connected in parallel with the first branch.It, can be in unit such as the mode of connection of Fig. 4 a in operation and maintenance
The armamentarium in unit single-phase series capacitance compensation equipment including by-pass switch BP and damping circuit D is exited when operation
And it is isolated and is safeguarded.
For another example the mode of connection of Fig. 4 b and 4c, it can be seen that compared with the mode of connection of such as Fig. 4 a, Fig. 4 b's and 4c is connect
In line mode, unit single-phase series capacitance compensation equipment can save one group of isolation switch G3.Specifically, as shown in Figure 4 b,
Unit single-phase series capacitance compensation equipment includes capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit
D and disconnecting switch G1-G2；Wherein, two after the capacitor group C and metal oxide varistor MOV is connected in parallel
Connect disconnecting switch G1 and G2 respectively at end, constitutes second branch；The by-pass switch BP and damping circuit D that are connected in series and institute
Second branch is stated to be connected in parallel.Again as illustrated in fig. 4 c, unit single-phase series capacitance compensation equipment includes capacitor group C, metal oxygen
Compound rheostat MOV, by-pass switch BP, damping circuit D and disconnecting switch G1-G2；Wherein, the capacitor group C and described
Both ends after metal oxide varistor MOV is connected in parallel are connected disconnecting switch G1, damping circuit and disconnecting switch G2 respectively, structure
At third branch；The by-pass switch BP is connect with the third branch circuit parallel connection.It should be noted that in the mode of connection of Fig. 4 b
When lower progress operation and maintenance, by-pass switch BP can only be synchronous with unit out of service, and in the mode of connection of Fig. 4 b, damping circuit
D obstructed overcurrent when operating normally, and damping circuit can only be synchronous with unit out of service, damping circuit during unit is run
Stopping generator can only being accompanied when D equipment fault to be safeguarded.And when carrying out operation and maintenance under the mode of connection of Fig. 4 c, damping
Circuit D can be out of service under conditions of unit is run and maintenance is isolated, but when operating normally by electric current, there are micro
Power consumption.
In addition, the capacitance compensation of unit single-phase series described in the present embodiment equipment SCa, SCb or SCc are respectively mounted on one solely
On vertical high-voltage isulation platform.
Second embodiment
It as shown in Figure 2 b, is another basic framework schematic diagram of series capacitor compensation of embodiment of the present invention transmission of electricity.Wherein, described
Compensator with series capaci tance is connected on the high-tension line between generator and the system busbar of generator connection.It is specific and
Speech, the different generator U1-U4 of power plant, after being respectively connected to compensator with series capaci tance SC1-SC4, access system bus.As it can be seen that
The embodiment of the present invention can be in the high pressure of every generator access system bus in order to improve ability of supplying electric power and set steady
Series connection accesses compensator with series capaci tance respectively on lead.
It optionally, respectively include the identical unit single-phase series of three-phase in the compensator with series capaci tance SC1-SC4
Capacitance compensation equipment, a, b, c as shown in Figure 3a are connected in series capacitance compensation equipment SCa, SCb and SCc.The series capacitor compensation
Each be connected in series capacitance compensation equipment SCa, SCb or the SCc of device SC1~SC4, can want according to the flexibility to operation and maintenance
Ask different, using the mode of connection of such as Fig. 4 a, 4b or 4c.Wherein, as in the mode of connection of Fig. 4 a, unit single-phase series capacitor
Compensating equipment includes capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D and disconnecting switch
G1-G3.In operation and maintenance, such as the mode of connection of Fig. 4 a, unit single-phase series capacitance compensation can be set when unit is run
Armamentarium in standby including by-pass switch BP and damping circuit D, which exits and is isolated, to be safeguarded.For another example Fig. 4 b and 4c
The mode of connection, it can be seen that compared with the mode of connection of such as Fig. 4 a, in the mode of connection of Fig. 4 b and 4c, unit single-phase series
Capacitance compensation equipment can save one group of isolation switch G3, but by-pass switch must be synchronous with unit out of service.Such as Fig. 4 b
In the mode of connection, damping circuit D obstructed overcurrent when operating normally, network loss is smaller, but damping circuit can only be synchronous with unit
It is out of service, it can only be accompanied when damping circuit D equipment fault during unit is run and stop paying out motor and safeguarded.Such as the wiring of Fig. 4 c
In mode, damping circuit D can be out of service under conditions of unit is run and maintenance is isolated, but passes through electricity when operating normally
Stream, there are micro power consumptions.
In addition, the capacitance compensation of unit single-phase series described in the present embodiment equipment SCa, SCb or SCc are respectively mounted on one solely
On vertical high-voltage isulation platform.
3rd embodiment
With reference to Fig. 2 a, in the embodiment of the present invention, the compensator with series capaci tance is connected to the height of the step-up transformer of generator
The low-pressure end for pressing output loop, i.e., between the neutral point that step-up transformer high-voltage winding low-pressure end is connected with three.Specifically,
The different generator U1-U4 of power plant, respectively after step-up transformer T1-T4 boosting, access system bus.In order to improve power transmission
Ability and set steady, the embodiment of the present invention seal in string on the lead of every generator U1-U4 access system bus respectively
Join Electric capacity compensation device SC1~SC4, since station step-up transformer three-phase high-voltage winding low-pressure end can be drawn, in order to reduce
Compensator with series capaci tance is serially connected in the high-voltage winding low-pressure end of step-up transformer by the resistance to voltage levels of compensator with series capaci tance
Between its three-phase neutral point.A, b, c as shown in Figure 3b is connected in series capacitance compensation equipment SCa, SCb and SCc.The series electrical
Holding compensation device SC1~SC4 includes three single-phase series capacitance compensation equipment SCa, SCb or SCc.In addition, the unit list
Capacitance compensation equipment SCa, SCb that is connected in series or SCc are respectively mounted on the ground.
It should be noted that in embodiments of the present invention, since units connected in series Electric capacity compensation device and three-phase neutral point connect
It is connected together, therefore specific wiring has multiple combinations and variation again.For the ease of the replacement and dimension after damping circuit D failure
Shield, damping circuit D can be serially connected in main circuit, be operated normally through electric current, as shown in Figure 5 a, when unit single-phase series electricity
Hold capacitor group C, the metal oxide varistor MOV in compensation equipment or damping circuit D equipment fault, side can be closed
The equipment such as way switch BP, feed-through capacitor group C, then pull open isolation switch G1 and G2, safeguard to faulty equipment.In order to drop
Damping circuit D can also be connected in bypass loop by loss when low normal operation, as shown in Figure 5 b, at this point, capacitor group
C, after metal oxide varistor MOV failure, isolation maintenance can be carried out under unit service condition, damping circuit D is normally transported
Unworkable overcurrent, only when capacitor group C etc. is bypassed by electric current, loss is lower, but damping circuit D equipment fault needs to send out
Motor is accompanied stopping and is safeguarded；For the connection scheme of Fig. 5 b, three-phase damping circuit can also be merged, it is public using one
Damping circuit, as shown in Figure 5 c, can be further simplified in this way circuit, reduce investment, improve reliability.Wherein, Fig. 5 a, 5b
The connection type of middle cellular construction is specifically referred in previous embodiment the explanation in relation to Fig. 4 c, 4b, and details are not described herein again.
Fourth embodiment
With reference to Fig. 2 b, in the embodiment of the present invention, the compensator with series capaci tance is connected to the generator and the generator
The low-pressure end of transmitting loop between the system busbar of connection.Specifically, the different generator U1-U4 of power plant is respectively connected to go here and there
Join Electric capacity compensation device SC1-SC4.Unit single-phase series capacitor is connected in series in the low-pressure end of the three-phase windings of every unit respectively
Neutral ground, generator windings high-voltage end access system bus are connected into after compensation equipment SCa, SCb or SCc.As it can be seen that this hair
Bright embodiment can be connected thereto to improve ability of supplying electric power and set steady in every generator three-phase windings low-pressure side
Neutral point between series connection access compensator with series capaci tance.The case where step-up transformer access system is passed through for unit, if
Three-phase high-voltage winding low-pressure end can be drawn, in order to reduce the resistance to voltage levels of compensator with series capaci tance, by series capacitor compensation
Device serial connection is between the low-pressure end and its three-phase neutral point of the step-up transformer high-voltage winding of generator.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can be with reference to the corresponding process in previous embodiment, and details are not described herein.
It is connect in addition, the embodiment of the present invention gives units connected in series Electric capacity compensation device by impedance transformation and isolating transformer
Enter the embodiment of generator lead-out wire.For the ease of capacitor in compensator with series capaci tance and its metal oxide varistor etc.
The selection of equipment, or in order to which compensator with series capaci tance to be isolated with a high-pressure system, in above-mentioned first embodiment to
The compensator with series capaci tance position of four embodiments, which can also replace, is connected in series an impedance transformation and isolating transformer Tsc,
Then compensator with series capaci tance is connected with the secondary side of isolating transformer Tsc in impedance transformation, third or the 4th is implemented
The case where example is connected to transmitting loop low-pressure end, as shown in Figure 3c.Three low-pressure ends of generator step-up transformer high-voltage winding or
Three-phase is connected as neutral point after an impedance transformation and isolating transformer Tsc is connected in series in person's generator three-phase windings low-pressure end
Ground connection, impedance transformation connect three-phase series capacitance compensation equipment SCa, SCb and SCc with the secondary side of isolating transformer.For series connection
Electric capacity compensation device is connected to the case where generator sends out loop high-voltage end, needs impedance transformation and isolating transformer Tsc
All (i.e. 6) terminals of primary side winding are all drawn, and 6 terminals can bear the identical high voltage of system busbar, connect
It is fashionable, the three-phase high-voltage lead-out wire of transmitting loop is disconnected, the three-phase windings of impedance transformation and isolating transformer Tsc are gone here and there respectively
Join in three-phase lead-out wire.Since the primary and secondary side of impedance transformation and isolating transformer Tsc is isolation, connection series capacitance is mended
Repay device secondary side can independent the setting grounding point, therefore, such embodiment can save compensator with series capaci tance
Insulated platform, can using the mode of connection of Fig. 5 a, 5b, 5c, no matter the primary side access of impedance transformation and isolating transformer Tsc
High-voltage end or low-pressure end.
In conclusion unit compensated transmission system of the embodiment of the present invention, passes through the system busbar accessed in generator with it
Between series connection access compensator with series capaci tance, according to system situation, compensator with series capaci tance can be serially connected in unit access
The high-voltage end of system circuit can also be serially connected in the low-pressure end in unit access system circuit.When generator passes through step-up transformer
When access system bus, the compensator with series capaci tance can be serially connected on step-up transformer high-voltage connection, for creating machine
Group or while satisfying the requirements, can also be serially connected in the low-pressure end in step-up transformer High voltage output circuit, i.e., the low-pressure end of high-voltage winding with
Between three joining neutral points, moreover, the equipment of compensator with series capaci tance directly can be arranged in ground in this case
On, it is not necessarily to high-voltage isulation platform.Since compensator with series capaci tance of the embodiment of the present invention is respectively configured by unit, in reality
Compensator with series capaci tance can be separately designed for the concrete condition of unit in, to reduce compensator with series capaci tance
Negative effect to unit can also install different series capacitor compensation dresses for the actual conditions design of different units
It sets, realizes more flexible.
Further, compared with the classical tandem Electric capacity compensation device that the prior art connects on the transmission line, the present invention
The unit compensated transmission system that embodiment provides does not need spark gap and its control system, simplifies system and constitutes, reduces investment
Cost improves system reliability.In addition, compensator with series capaci tance is also provided with by-pass switch and isolation switch, to run
Maintenance.Unit compensated transmission system provided in an embodiment of the present invention can although increasing the quantity of compensator with series capaci tance
With solve all technical problems exist in the prior art, can also be greatly lowered capacitor group in compensator with series capaci tance,
The total capacity of the capital equipments such as metal oxide varistor, so that gross investment be greatly lowered.Due to compensator with series capaci tance
The operating current of middle capacitor group is it is only necessary to consider the maximum operating currenbt of generating set, without considering overload capacity；Due to
Generator low-pressure side is usually enclosed busbar, may not need and considers that enclosed busbar failure is possible, in this way, the embodiment of the present invention provides
Unit compensated transmission system it is much smaller compared with prior art short circuit current in need of consideration, thus, metal oxide variable resistance
The configuration scale of device, other equipment correlation nominal parameter are much smaller.
In addition, unit compensated transmission system provided in an embodiment of the present invention can also greatly improve unit static state and
Transient Stability Level, during the external system failure, the metal oxide varistor in compensator with series capaci tance is in protection electricity
A large amount of generator power is absorbed while container is against damages, is played and is put into no-delayly after the system failure and its disappearance
With exit the effect of braking resistor, to increase substantially unit Transient Stability Level.
In embodiment provided herein, it should be understood that disclosed device and method can pass through others
Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.
Claims (9)
1. a kind of unit compensated transmission system, which is characterized in that the system comprises: compensator with series capaci tance, the series connection
Electric capacity compensation device series connection access is between the system busbar that generator and the generator connect.
2. unit compensated transmission system according to claim 1, which is characterized in that if the generator is more power generations
Machine, then access series electrical of connecting between the system busbar that an at least generator is connected with an at least generator
Hold compensation device.
3. unit compensated transmission system according to claim 1, which is characterized in that the compensator with series capaci tance connection
High-tension line between the system busbar of the step-up transformer connection of the step-up transformer and the generator of the generator
On；Or the compensator with series capaci tance is connected to the high pressure between the generator and the system busbar of generator connection
On route.
4. unit compensated transmission system according to claim 3, which is characterized in that wrapped in the compensator with series capaci tance
Three single-phase series capacitance compensation equipment are included, the single-phase series capacitance compensation equipment is separately mounted on insulated platform.
5. unit compensated transmission system according to claim 1, which is characterized in that the compensator with series capaci tance connection
Low-pressure end in the generator and its step-up transformer high voltage power transmission circuit；Or the compensator with series capaci tance is connected to institute
State the low-pressure end in generator transmission circuit.
6. unit compensated transmission system according to claim 5, which is characterized in that the compensator with series capaci tance connection
In the low-pressure end of the step-up transformer transmitting loop of the generator, i.e., the described step-up transformer high-voltage winding low-pressure end and three-phase
Between the neutral point of connection；Or the compensator with series capaci tance is connected to the low-pressure end in the generator transmission circuit, i.e. institute
The low-pressure end of generator three-phase windings is stated between neutral point that three are connected.
7. unit compensated transmission system according to claim 5, which is characterized in that wrapped in the compensator with series capaci tance
Three single-phase series capacitance compensation equipment are included, the single-phase series capacitance compensation equipment is separately mounted on ground.
8. the unit compensated transmission system according to claim 4 or 7, which is characterized in that the single-phase series capacitance compensation
Equipment includes:
Capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D and disconnecting switch G1-G3；Its
In, the by-pass switch BP and the damping circuit D of series connection, with the capacitor group C, the metal oxide variable resistance
Both ends after device MOV is connected in parallel are connected the disconnecting switch G1 and G2 respectively, constitute the first branch；The disconnecting switch G3 with
The first branch is connected in parallel；Or
Capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D and disconnecting switch G1-G2；Its
In, the capacitor group C and the metal oxide varistor MOV be connected in parallel after both ends connect respectively disconnecting switch G1 and
G2 constitutes second branch；The by-pass switch BP and damping circuit D being connected in series are connected in parallel with the second branch；Or
Capacitor group C, metal oxide varistor MOV, by-pass switch BP, damping circuit D and disconnecting switch G1-G2；Its
In, the capacitor group C and the metal oxide varistor MOV be connected in parallel after both ends connect respectively disconnecting switch G1,
Damping circuit D and disconnecting switch G2 constitutes third branch；The by-pass switch BP is connect with the third branch circuit parallel connection.
9. unit compensated transmission system according to claim 1, which is characterized in that the compensator with series capaci tance passes through
Impedance transformation and isolating transformer are connected in series between generator and the system busbar of generator connection.
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|---|---|---|---|
| CN201810463684.7A CN110492491A (en) | 2018-05-15 | 2018-05-15 | A kind of unit compensated transmission system |
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| CN201810463684.7A CN110492491A (en) | 2018-05-15 | 2018-05-15 | A kind of unit compensated transmission system |
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