CN105870927A - Unified power flow controller with multiple operational modes - Google Patents
Unified power flow controller with multiple operational modes Download PDFInfo
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- CN105870927A CN105870927A CN201610144631.XA CN201610144631A CN105870927A CN 105870927 A CN105870927 A CN 105870927A CN 201610144631 A CN201610144631 A CN 201610144631A CN 105870927 A CN105870927 A CN 105870927A
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- 230000005611 electricity Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
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- 230000006870 function Effects 0.000 description 5
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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Abstract
The invention provides a unified power flow controller with multiple operational modes. The unified power flow controller comprises a transformer, a converter module (12) and a mode conversion switch module (11), wherein the transformer comprises at least one series transformer (3) connected to a power transmission line in series and a shunt transformer (8) connected to an alternating current system in parallel; and one end of the converter module (12) is connected with the shunt transformer (8) through the mode conversion switch module (11) while the other end of the converter module (12) is connected with the corresponding series transformer (3) through the mode conversion switch module (11). When the unified power flow controller is used for the power transmission line or the power distribution line, the power flow control capability and the voltage stability of the line can be greatly improved, so that the unified power flow controller has the advantages of flexible function and high reliability.
Description
Technical field
The present invention relates to electric and electronic technical field, the Unified Power Flow of a kind of many operational modes controls
Device.
Background technology
Along with greatly developing of power system, the scale of new forms of energy accesses, grid structure is day by day complicated, trend is divided
The problems such as cloth inequality, voltage support scarce capacity propose new requirement to the safe and stable operation of electrical network, bring
New challenge.The power supply bottleneck that some areas occur, it is impossible to meet load development need.The operation feelings of electrical network
Condition shows, trend skewness is the key factor of restriction electric network transportation ability.Have in view of tradition electrical network lacks
The power flow regulating means of effect, need to be with novel flexible current delivery system (Flexible Alternative Current
Transmit System, FACTS) improve system conditions, it is ensured that and stable operation, is to improve electrical network conveying
The one of capacity is real and preferably selects.
THE UPFC (Unified Power Flow as the 3rd generation FACTS system code
Controller, UPFC), being that function is the most comprehensive up to now, can separately or concurrently realize parallel connection because having
The multiple basic functions such as compensation, series compensation, phase shift and terminal voltage regulation.UPFC can guarantee power train
Realize power flow regulating, conservative control active power, reactive power in the case of system stable operation, improve the defeated of circuit
Send ability, it is achieved optimize and run；Can be handled up by fast reactive in the dynamic case again, dynamic support accesses
The voltage of point, improves the voltage stability of system；Moreover, also can improve system damping, improve merit angle
Stability.Existing THE UPFC is connected respectively by two voltage source converters and access system in parallel,
Series side realizes power flowcontrol function, and side in parallel realizes reactive voltage regulatory function.But its functional configuration is inadequate
Flexibly, such as need not power flowcontrol, and when needing a large amount of reactive power support, it is impossible to made by flexible configuration be
Two whole parallel reactive of transverter of uniting compensate and run.
For the problems referred to above, it is therefore desirable to carry and a kind of meet different system fading margin demands, and reduce device loss,
Improve the THE UPFC of equipment dependability.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides the Unified Power Flow of a kind of many operational modes to control
Device, comprises the following steps:
THE UPFC includes: transformer, current changer module (12) and mode conversion switch module (11),
Transformer includes that series connection accesses the series transformer (3) of transmission line of electricity, and the change in parallel of incoming transport system in parallel
Depressor (8)；Current changer module (12) one end is through mode conversion switch module (11) and shunt transformer (8)
Being connected, the other end is connected with described series transformer (3) and mode conversion switch module (11).
Current changer module (12) including: the first transverter (13) and the second transverter (14)；First change of current
The DC side of device (13) and the second transverter (14) is connected with each other；The AC of the first transverter (13) with
Mode conversion switch module (11) one end is connected；The AC of the second transverter (14) includes through the first open circuit
The branch road that device (5) is connected with series transformer (3), and another with what mode conversion switch module (11) was connected
One branch road.
Series transformer (3) is in parallel with by-pass switch (2)；Set between shunt transformer (8) and AC system
There is the second breaker (7).
Mode conversion switch module (11) including: the first soft starting circuit (9), first mode change-over switch (6)
With the second mode conversion switch (10)；
The AC of the second transverter (14) through first mode change-over switch (6), the first transverter (13)
AC is connected with the first soft starting circuit (9) one end through the second mode conversion switch (10), first soft
The other end of dynamic circuit (9) is connected with shunt transformer (8) one end.
Mode conversion switch module (11) including: the first soft starting circuit (9), the second soft starting circuit (15),
First mode change-over switch (6) and the second mode conversion switch (10)；First soft starting circuit (9) and
One end interconnection of two soft starting circuits (15), the first soft starting circuit (9) other end is changed through first mode
Switch (6) is connected with the second transverter (14) AC, the second soft starting circuit (15) other end is through the
Two modes change-over switch (10) first transverter (13) AC is connected.Shunt transformer (8) be three around
Group transformer.
Mode conversion switch module (11) including: the first soft starting circuit (9), the second soft starting circuit (15),
First mode change-over switch (6) and the second mode conversion switch (10)；The AC of transverter (14) is through
One mode conversion switch (6) is connected with the first soft starting circuit (9) one end, the AC of transverter (13)
It is connected with described second soft starting circuit (15) one end through the second mode switch (10)；First soft starting circuit
(9) the other end and the second soft starting circuit (15) other end respectively with the two ends phase in three-winding transformer
Even.
Mode conversion switch module (11) including: the first soft starting circuit (9), the second soft starting circuit (15),
First mode change-over switch (6) and the second mode conversion switch (10)；The AC of the second transverter (14)
It is connected with the first soft starting circuit (9) one end through first mode change-over switch (6), the first transverter (13)
AC be connected with the second soft starting circuit (15) one end through the second mode switch (10)；First soft start
The other end of circuit (9) and the first shunt transformer (16) one end are connected, the second soft starting circuit (15)
The other end is connected with shunt transformer (8) one end, shunt transformer (8) and described first shunt transformer (16)
The other end be connected with each other.First soft starting circuit (9) and the second soft starting circuit (15) include resistance and
Breaker connected in parallel.
First transverter (13) and described second transverter (14) including: two level converters, three level change
Stream device, modularization multi-level converter, H bridge cascade connection multi-level transverter, diode clamp bit-type transverter and/
Or striding capacitance type transverter.
By-pass switch (2) including: the switch that breaker, disconnecting switch and/or power electronic devices are constituted；Open
Close as single switch or double bypass structures of two switch compositions.
First mode change-over switch (6) and the second mode conversion switch (10) including: breaker, keep apart
Close and/or the switch of power electronic devices composition.
Operational mode includes: UPFC operational mode, single STATCOM operational mode, double STATCOM run
Pattern and SSSC operational mode.
Compared with immediate prior art, the present invention provide technical scheme have following benefit effect:
1, present invention achieves four kinds of different operational modes, including: UPFC operational mode, single STATCOM
Pattern, double STATCOM pattern and SSSC pattern.
2, four kinds of pattern flexibly configurables of the present invention, can need the different operational mode of switching according to operation of power networks.
Especially, double STATCOM patterns can provide dynamic passive compensation on a large scale, meets different running method requirement,
Improve system voltage stability.
3, the present invention is when transmission of electricity or distribution line, Line Flow control ability can be greatly improved and voltage is steady
Qualitative, there is flexible function, advantage that device reliability is high.
Accompanying drawing explanation
Fig. 1 is a kind of THE UPFC structural representation of the embodiment of the present invention；
Fig. 2 is the another kind of THE UPFC structural representation of the embodiment of the present invention；
Fig. 3 is another THE UPFC structural representation of the embodiment of the present invention；
Fig. 4 is another THE UPFC structural representation of the embodiment of the present invention；
1-ac bus；2-by-pass switch；3-series transformer；4-transmission line of electricity resistance；5-the first breaker；
6-first mode change-over switch；7-the second breaker；8-shunt transformer；9-the first soft starting circuit；10-
Two modes change-over switch；11-mode conversion switch module；12-current changer module；13-the first transverter；14-
Second transverter；15-the second soft starting circuit；16-the first shunt transformer.
Detailed description of the invention
Below in conjunction with Figure of description, technical scheme is described in further details.
In the THE UPFC of a kind of many operational modes as shown in Figure 1, comprise at least one series-transformer
Device 8, two transverters 13 and 14 of 3, shunt transformer, mode conversion switch 6 and 10 and other
Necessary power equipment.The DC side of two of which transverter is connected through switch, and the AC of transverter turns through pattern
Changing switch and be respectively connected to series transformer 3 and shunt transformer 8, series transformer 3 series connection accesses transmission line of electricity,
Shunt transformer 8 incoming transport system in parallel.
Transverter can use two level converters, three-level converter, modularization multi-level converter, H bridge
Any one or more such as cascade connection multi-level transverter, diode clamp bit-type transverter and striding capacitance type transverter
Combination.The protection of transverter need to configure Quick side way switch, when system or plant failure, is placed in by transverter
Bypass, it is to avoid system is the adverse effect to system to device or device.Quick side way switch can be breaker,
The switch that disconnecting switch or power electronic devices are constituted, switch can be the double of single switch or two switch compositions
Bypass structure, preferably uses IGCT two-way switch.
The side transverter of protection series connection need to configure Quick side way switch 2, when system or plant failure, by the change of current
Device bypasses, it is to avoid system is the adverse effect to system to device or device.Quick side way switch, can be open circuit
The switch that device, disconnecting switch or power electronic devices are constituted, switch can be single switch or two switch compositions
Double bypass structures, it is preferred to use IGCT two-way switch.
Mode conversion switch can use breaker or disconnecting switch or power electronic devices to constitute
Any one or more combinations such as switch.
Shunt transformer can use double winding or three-winding transformer, comprises between shunt transformer and transverter
At least one soft starting circuit, concrete type of attachment is including but not limited to following four kinds of forms.Fig. 1 is two
Transverter, through a soft starting circuit 9, accesses a double winding transformation 8；Fig. 2 is that two transverters pass through
Two soft starting circuits 9 and 15, access a two-winding transformer 8；Fig. 3 is that two transverters are through two
Soft starting circuit 9 and 15, accesses three-winding transformer 8；Fig. 4 is that two transverters are through two soft start electricity
Road 9 and 15, accesses two two-winding transformers 8 and 16.
Need exist for explanation: the present invention be not noted for protection between coupling transformer, transverter switch,
The equipment such as the arrester of switching device and gap, do not indicate that device manufacture and design and engineering actual implement time, do not deposit
At these equipment.Meanwhile, when Practical Project is implemented, have many isolation switch, breaker, current measurement set
Standby, voltage measuring apparatus.The most do not draw these equipment, when not indicating that the actual enforcement of engineering, there is not this
A little equipment.
The THE UPFC in the present invention with plurality of operating modes can be by the back brake of mode conversion switch
Operation realizes different operational mode, and attainable operational mode includes but not limited to: UPFC operational mode,
Single STATCOM pattern, double STATCOM pattern and SSSC pattern.Illustrate with the embodiment of Fig. 1,
But it is not limited to operational mode and the back brake mode of this embodiment.
1. UPFC operational mode:
Breaker and the second pattern in first breaker the 5, second breaker the 7, first soft starting circuit 9 turn
Change switch 10 to be in closure state, by-pass switch 2 and first mode change-over switch 6 and be off, and
Connection side transverter 8 transformer access system in parallel, it is possible to achieve the dynamic passive compensation of side in parallel.Series connection
Side transverter 3 is by series transformer access system, it is achieved the independence of active reactive trend controls.
2. single STATCOM pattern:
It is by side in parallel transverter and illustrates as a example by single STATCOM, by-pass switch the 2, second breaker 7,
Breaker and the second mode conversion switch 10 in first soft starting circuit 9 are in closure state, the first open circuit
Device 5, first mode change-over switch 6 are off.Series side transverter does not runs, no power waste.
Side in parallel transverter is through shunt transformer access system, it is achieved dynamic passive compensation.Dynamic reactive can be realized prop up
Support, improves varying DC link voltage ability, meets electrical network low ebb charge power unnecessary to absorbing cable and peak is idle
The different demands of vacancy.Series side and side in parallel transverter all can individually make STATCOM mode operation, each other
Redundancy is standby, improves the reliability of plant running.
The most double STATCOM patterns:
In by-pass switch 2, first mode change-over switch the 6, second breaker the 7, first soft starting circuit 9
Breaker and the second mode conversion switch 10 are in closure state, and the first breaker 5 is off.Two
Through shunt transformer access system after individual transverter parallel connection, it is achieved dynamic passive compensation.Double STATCOM moulds
Formula can provide bigger dynamic reactive to support, and improves varying DC link voltage ability, meets electrical network low ebb to absorbing electricity
The unnecessary charge power of cable and the different demands of peak no-power vacancy.
4. SSSC pattern:
First breaker 5 is in closure state, by-pass switch 2, the 6, second open circuit of first mode change-over switch
Breaker and the second mode conversion switch 10 in device the 7, first soft starting circuit 9 are off.And
Connection side transverter does not runs, no power waste.Series side transverter passes through series transformer access system, it is achieved
SSSC operational mode, carries out power flowcontrol, it is possible to equilibrium Line Flow, improves the section transmitted power limit.
Furthermore, it is necessary to explanation: the main electrical scheme of many operational modes is not limited to the structure shown in embodiment, any
Involve the THE UPFC using change-over switch to increase different operational mode, broadly fall into the scope of the invention it
In.
Embodiment of the present invention is shown in the drawings, and the most same or similar label represents phase
With or similar element or there is the element of same or like function.The embodiment described by Figure of description is
Exemplary, it is intended to it is used for explaining the present invention, and is not considered as limiting the invention.
Finally should be noted that: it is only limited by above example in order to technical scheme to be described
System, those of ordinary skill in the field still can be to the detailed description of the invention of the present invention with reference to above-described embodiment
Modifying or equivalent, these replace without departing from any amendment or the equivalent of spirit and scope of the invention
Change, within the claims of the present invention all awaited the reply in application.
Claims (13)
1. a THE UPFC for operational mode more than, described THE UPFC includes transformer, changes
Stream device module (12) and mode conversion switch module (11), it is characterised in that
Described transformer includes that series connection accesses the series transformer (3) of transmission line of electricity, and incoming transport system in parallel
Shunt transformer (8)；
Described current changer module (12) one end is through described mode conversion switch module (11) and described parallel pressure change
Device (8) is connected, the other end and described series transformer (3) and described mode conversion switch module (11) phase
Even.
THE UPFC the most according to claim 1, it is characterised in that described current changer module
(12) including: the first transverter (13) and the second transverter (14)；
The DC side of described first transverter (13) and the second transverter (14) is connected with each other；
The AC of described first transverter (13) is connected with described mode conversion switch module (11) one end；
The AC of described second transverter (14) includes through the first breaker (5) and described series transformer
(3) branch road being connected, and another branch road being connected with described mode conversion switch module (11).
THE UPFC the most according to claim 2, it is characterised in that
Described series transformer (3) is in parallel with by-pass switch (2)；
The second breaker (7) it is provided with between described shunt transformer (8) and described AC system.
THE UPFC the most according to claim 3, it is characterised in that, described mode conversion switch
Module (11) including: the first soft starting circuit (9), first mode change-over switch (6) and the second pattern turn
Change switch (10)；
The AC of described second transverter (14) is through first mode change-over switch (6), described first transverter
(13) AC is through the second mode conversion switch (10) and described first soft starting circuit (9) one end phase
Even, the other end of described first soft starting circuit (9) is connected with described shunt transformer (8) one end.
THE UPFC the most according to claim 3, it is characterised in that described mode conversion switch
Module (11) including: the first soft starting circuit (9), the second soft starting circuit (15), and first mode is changed
Switch (6) and the second mode conversion switch (10)；
One end interconnection of described first soft starting circuit (9) and described second soft starting circuit (15), described
First soft starting circuit (9) other end is through described first mode change-over switch (6) and described second transverter (14)
AC is connected, and described second soft starting circuit (15) other end is through described second mode conversion switch (10)
Described first transverter (13) AC is connected.
THE UPFC the most according to claim 3, it is characterised in that described shunt transformer (8)
For three-winding transformer.
THE UPFC the most according to claim 6, it is characterised in that described mode conversion switch mould
Block (11) including: the first soft starting circuit (9), the second soft starting circuit (15), and first mode conversion is opened
Close (6) and the second mode conversion switch (10)；
The AC of described second transverter (14) is through described first mode change-over switch (6) and described first
Soft starting circuit (9) one end is connected, and the AC of described first transverter (13) is opened through described second pattern
Close (10) to be connected with described second soft starting circuit (15) one end；
The other end and described second soft starting circuit (15) other end of described first soft starting circuit (9) divide
It is not connected with the two ends in described three-winding transformer.
THE UPFC the most according to claim 3, it is characterised in that described mode conversion switch
Module (11) including: the first soft starting circuit (9), the second soft starting circuit (15), and first mode is changed
Switch (6) and the second mode conversion switch (10)；
The AC of described second transverter (14) is through described first mode change-over switch (6) and described first
Soft starting circuit (9) one end is connected, and the AC of described first transverter (13) is opened through described second pattern
Close (10) to be connected with described second soft starting circuit (15) one end；
The other end of described first soft starting circuit (9) and the first shunt transformer (16) one end are connected, institute
State the second soft starting circuit (15) other end to be connected with described shunt transformer (8) one end, described change in parallel
The other end of depressor (8) and described first shunt transformer (16) is connected with each other.
THE UPFC the most according to claim 8, it is characterised in that
Described first soft starting circuit (9) and the second soft starting circuit (15) include resistance and connected in parallel
Breaker.
THE UPFC the most according to claim 1, it is characterised in that described first transverter
(13) including with described second transverter (14): two level converters, three-level converter, modularization are many
Level converter, H bridge cascade connection multi-level transverter, diode clamp bit-type transverter and/or the striding capacitance type change of current
Device.
11. THE UPFC according to claim 3, it is characterised in that described by-pass switch (2)
Including: the switch that breaker, disconnecting switch and/or power electronic devices are constituted；
Described switch is single switch or double bypass structures of two switch compositions.
12. THE UPFC according to claim 4, it is characterised in that described first mode is changed
Switch (6) and described second mode conversion switch (10) including: breaker, disconnecting switch and/or electric power electricity
The switch that sub-device is constituted.
13. THE UPFC according to claim 1, it is characterised in that operational mode includes:
UPFC operational mode, single STATCOM operational mode, double STATCOM operational mode and SSSC operational mode.
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| CN201610144631.XA CN105870927A (en) | 2016-03-14 | 2016-03-14 | Unified power flow controller with multiple operational modes |
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| CN106961108A (en) * | 2017-05-08 | 2017-07-18 | 许继集团有限公司 | A kind of THE UPFC |
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| CN106961108A (en) * | 2017-05-08 | 2017-07-18 | 许继集团有限公司 | A kind of THE UPFC |
| CN107994565A (en) * | 2017-10-30 | 2018-05-04 | 中国电力科学研究院有限公司 | The emulation mode and its system of a kind of THE UPFC |
| CN107994565B (en) * | 2017-10-30 | 2021-11-02 | 中国电力科学研究院有限公司 | Simulation method and system of unified power flow controller |
| CN110649499A (en) * | 2018-06-26 | 2020-01-03 | 河南平芝高压开关有限公司 | GIS applied to indoor UPFC engineering |
| CN110649499B (en) * | 2018-06-26 | 2021-06-01 | 河南平芝高压开关有限公司 | GIS applied to indoor UPFC engineering |
| CN110086191A (en) * | 2019-01-31 | 2019-08-02 | 中国电力科学研究院有限公司 | A kind of failure of the MMC-UPFC based on current-limiting reactor gets over method |
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