CN103414185A - Unified power flow controller and control method thereof - Google Patents
Unified power flow controller and control method thereof Download PDFInfo
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- CN103414185A CN103414185A CN2013103214436A CN201310321443A CN103414185A CN 103414185 A CN103414185 A CN 103414185A CN 2013103214436 A CN2013103214436 A CN 2013103214436A CN 201310321443 A CN201310321443 A CN 201310321443A CN 103414185 A CN103414185 A CN 103414185A
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Abstract
The invention discloses a unified power flow controller. The unified power flow controller comprises a plurality of series side converters, a plurality of transformers connected in series, a plurality of primary side winding by-pass switches, a parallel side converter, a parallel transformer and a wire incoming switch. The alternating-current ends of all the series side converters are connected with corresponding secondary side windings of the transformers connected in series, primary side windings of the transformers connected in series are connected with the corresponding primary side winding by-pass switches in parallel, and the primary side winding by-pass switches are connected into corresponding circuits in series. The direct-current ends of all the series side converters are connected in parallel and jointly connected with the direct-current end of the parallel side converter, the alternating-current end of the parallel side converter is connected with one end of the parallel transformer, and the other end of the parallel transformer is connected with an alternating-current bus of a multi-loop circuit through the wire incoming switch. The topological structure can achieve multiple operation modes and save a plurality of parallel side converters and transformers, has good economical efficiency and flexibility. The invention further discloses a control method of the unified power flow controller.
Description
Technical field
The present invention relates to a kind of flexible AC transmission technology, particularly a kind of THE UPFC and control method thereof that is applied to many times or many circuits.
Background technology
Along with the use of the interconnected and various new equipments of large-scale power system, make generate electricity, transmit electricity scale and complexity more economical, that also increased more efficiently electric power system simultaneously; Add a large amount of distributed generation system access electrical networks, make traditional fixing to the trend that power distribution network transmits, occur reverse by power transmission network; The continuous growth of customer charge needs the trend control device to improve existing power delivery ability; Just complicated Power Exchange needs trend frequently to control between flourish intelligent grid and electricity market.
THE UPFC, claim again UPFC(Unified Power Flow Controller), it is the best tidal current controller of versatility so far, it is connected by the direct current common port by two identical voltage source converters, can be regarded as a STATCOM (STATCOM) and a Static Series Synchronous Compensator (SSSC) formation in parallel, only by changing control law, just can be respectively or simultaneously and realize rapidly the different control functions such as shunt compensation, series compensation and phase shift improving the performance of electric power system.
To the more of THE UPFC research, be at present the control strategy for the single back line THE UPFC, function is controlled in trend control, damping system vibration etc., few to THE UPFC and the control method research and comparison that is applied to many times or many circuits.Because the current power transmission network is mostly double-circuit line or multi circuit transmission lines more, tide optimization problem and (N-1) cross the meeting such as flow problem embodiment is all arranged on multi circuit transmission lines, as the trend of only on wherein circuit of multi circuit transmission lines, the THE UPFC control circuit being installed, the poor effect of control.Therefore, if the Optimizing Site Selection place of THE UPFC is many circuits of the different drop points of multi circuit transmission lines or same starting point, need on many times or many circuits, all install.If N return or every time or every of N bar circuit a set of complete UPFC(N all is installed is natural number), every cover UPFC is connected with a Static Series Synchronous Compensator (comprising a series transformer and a series side converter) by a STATCOM (comprising a shunt transformer and a side converter in parallel), altogether need 2N converter and 2N transformer, floor space is larger, and output investment ratio is larger.In addition, the trend of multi circuit transmission lines need to be coordinated to control, to improve the control efficiency of unified UPFC.
In order to solve the deficiency of above many times or many line applications THE UPFC, save cost and installing space, improve the control efficiency of THE UPFC, give full play to the advantage of THE UPFC, need a kind of more economical, the structure and the method that are more suitable for.
Summary of the invention
Purpose of the present invention, be to provide a kind of THE UPFC and control method thereof, this topological structure can be realized multiple operational mode, can save a plurality of side converters in parallel and transformer, have economy and flexibility preferably, control method is flexible, can realize that the coordination of double-circuit line trend is controlled.
In order to achieve the above object, solution of the present invention is:
A kind of THE UPFC, be applied to many circuits that have the multi circuit transmission lines of same starting point, same drop point and have same starting point, different drop points; Comprise several series side converters, several series transformer, several first side winding by-pass switch, a side converter in parallel, a shunt transformer and a service entrance switch, wherein, the quantity of series side converter, series transformer and first side winding by-pass switch and circuit return number or number is identical and corresponding one by one; The interchange end of each series side converter connects the secondary side winding of its corresponding series transformer, the first side winding of described series transformer is the parallel connection first side winding by-pass switch corresponding with it, and described first side winding by-pass switch is connected in its corresponding circuit; The DC terminal parallel connection of described all series side converters, and jointly connect the DC terminal of side converter in parallel, the interchange end of described side converter in parallel connects an end of shunt transformer, and the other end of shunt transformer connects the ac bus of multi circuit transmission lines or many circuits via service entrance switch.
Above-mentioned series side converter and side converter in parallel adopt the voltage-source type converter of two level structures, transformer multiple inverter configuration or modular multilevel structure.
Above-mentioned series transformer comprises three single-phase transformers, and the first side winding of three single-phase transformers seals in respectively three-phase line, and the star-like or angle type of the secondary side winding of three single-phase transformers joins.
The secondary side winding of above-mentioned series transformer also is parallel with mechanical by-pass switch or thyristor bypass switch.
The starting circuit of connecting between above-mentioned side converter in parallel and shunt transformer.
Above-mentioned starting circuit comprises resistance parallel with one another and switch.
A kind of control method based on foregoing THE UPFC, described control method is applicable to be applied in the THE UPFC of double-circuit line; Each loop line road is chosen as double-circuit line power control mode or single back line power control mode, communication mutually between double-circuit line, and control method is as follows:
(1) when two loop line roads are the double-circuit line power control mode, a selected wherein loop line road is carried out power division as the master control circuit to double-circuit line, each loop line road selects the power instruction of master control circuit output to control, and keeps the power of double-circuit line identical;
(2) when a loop line road be that double-circuit line power control mode, another loop line road are while being the single back line power control mode, adopt the circuit of single back line power control mode to control by the power instruction of self, adopt the circuit of double-circuit line power control mode guaranteeing under the constant prerequisite of double-circuit line gross power, the power instruction that obtains this circuit according to the power instruction on another loop line road is controlled;
(3) when two loop line roads are the single back line power control mode, two loop line roads are controlled by power instruction separately.
Above-mentioned control method also comprises following content: when the communication between double-circuit line is broken down, automatically each loop line road is switched to the single back line power control mode;
Above-mentioned control method also comprises following content: when a loop line road hindered tripping operation for some reason, corresponding series side converter blocking exited, and another loop line road and corresponding series side converter switch to single back line power control mode continuous service.
After adopting such scheme, the present invention can improve economy and the efficiency of many times or many line applications THE UPFC, realizes that the coordination of double-circuit line trend is controlled.Described structure can realize multiple operational mode, comprise single time or single line UPFC operational mode, many times or many circuit UPFC modes, many times or many circuit lines between trend control (IPFC) mode, side converter STATCOM operational mode in parallel, many times or many circuit SSSC operational modes, single time or single line SSSC operational mode etc.The series side converter control realizes the coordination control of many times or many Line Flows, and side converter in parallel provides all series side converters needed active power by direct current system, with AC system, carries out Quick reactive-load compensation simultaneously.Because several series side converters share a side converter in parallel, compare many times or many circuits are respectively installed a set of complete UPFC and can be saved a plurality of side converters in parallel and a plurality of shunt transformer, has good economy, particularly for alternating voltage, relatively stablize, do not need the voltage-controlled system of ac bus, obvious economic; Adopt described double-circuit line coordinated control mode, the ruuning situation different according to system, select different control modes, can improve the efficiency of THE UPFC, increases the flexibility of controlling.The coordinated control mode of multi circuit transmission lines be take the thought of described double-circuit line coordinated control mode and is basis, and its control is more flexible.
The accompanying drawing explanation
Fig. 1 is the single-phase equivalent structure figure that is applied to the THE UPFC of multi circuit transmission lines in the present invention;
Fig. 2 is the single-phase equivalent structure figure that is applied to the THE UPFC of double-circuit line in the present invention;
Fig. 3 is the single-phase equivalent structure figure of double-circuit line THE UPFC after the present invention adds side start-up circuit in parallel and series transformer secondary winding by-pass switch;
Fig. 4 is the control method flow chart of double-circuit line THE UPFC in the present invention.
Embodiment
The invention provides a kind of THE UPFC, as shown in Figure 1, comprise several series side converters, several series transformer, several first side winding by-pass switch, a side converter in parallel, a shunt transformer and a service entrance switch, wherein, the quantity of series side converter, series transformer and first side winding by-pass switch is counted identical and corresponding one by one with returning of circuit; The interchange end of each series side converter connects the secondary side winding of its corresponding series transformer, the first side winding of described series transformer is the parallel connection first side winding by-pass switch corresponding with it, and described first side winding by-pass switch is connected in its corresponding circuit; The DC terminal parallel connection of described all series side converters, and jointly connect the DC terminal of side converter in parallel, the interchange end of described side converter in parallel connects an end of shunt transformer, and the other end of shunt transformer connects the ac bus of multi circuit transmission lines via service entrance switch.Many the circuits that THE UPFC provided by the invention is applicable to the different drop points of same starting point are installed the application of THE UPFC, and the present embodiment be take double-circuit line and is example, and detailed content of the present invention is described.
As shown in Figure 2, it is the enforcement structure that the present invention is applied to double-circuit line, described THE UPFC comprises two series side converters 4, 7, two series transformers 5, 8, two first side winding by- pass switches 6, 9, a side converter 1 in parallel, a shunt transformer 2 and a service entrance switch 3, wherein, series side converter 4 and series side converter 7 are respectively by series transformer 5 and series transformer 8 access double-circuit lines, the first side winding of series transformer 5 and series transformer 8 is parallel with respectively by-pass switch 6 and by-pass switch 9, and described by- pass switch 6, 9 are connected on respectively in corresponding circuit, series side converter 4 and series side converter 7, in the DC terminal parallel connection, then are connected with the DC terminal of side converter 1 in parallel, side converter 1 in parallel is connected with shunt transformer 2, then by service entrance switch 3, is connected on the ac bus of double-circuit line.
In the present embodiment, side converter 1 in parallel, series side converter 4 and series side converter 7 can adopt the voltage-source type converter of two level structures, transformer multiple inverter configuration, modular multilevel structure or other topological structure.
As shown in Figure 3, the present embodiment starting circuit 10 of can connecting between side converter 1 in parallel and shunt transformer 2, starting circuit 10 is comprised of resistance in parallel and switch, before the service entrance switch 3 of shunt transformer 2 closes a floodgate, first drop into starting circuit 10, thus when reducing service entrance switch 3 and closing a floodgate to the impact of shunt transformer 2 and side converter 1 in parallel; More can be at the secondary side winding difference parallel thyristors by- pass switch 12,14 of series transformer 5 and series transformer 8; perhaps distinguish secondary side winding by-pass switch 11,13 in parallel; in system, break down, in locking series side converter 4,7; triggering and conducting thyristor bypass switch 12,14; the secondary side winding of closing by-pass switch 11,13; protection series side converter 4,7, described secondary side winding by-pass switch 11,13 can adopt mechanical by-pass switch.
The present invention also provides a kind of control method of aforementioned THE UPFC, and each loop line road all can be chosen as multi circuit transmission lines power control mode or single back line power control mode, communication mutually between multi circuit transmission lines; The line power of selecting the single back line power control mode is controlled separately; Among some loop lines selecting the multi circuit transmission lines power control mode, select a loop line as the master control circuit, keeping all circuit gross powers, be under the prerequisite of multi circuit transmission lines gross power reference value, the power of selecting some the circuits that multi circuit transmission lines power controls is distributed equally to control.
As shown in Figure 4, be the control flow chart that the present invention is applied to double-circuit line, the present embodiment is with active power, to be controlled to be example to describe, the method for Reactive Power Control is identical with Fig. 4, and is independent of active power control, specifically comprises following content:
Article two, circuit all can be chosen as double-circuit line power control mode or single back line power control mode, communication mutually between double-circuit line;
(1) when two loop line roads are the double-circuit line power control mode, a selected wherein loop line road is carried out power division as the master control circuit to double-circuit line, each loop line road selects the power instruction of master control circuit output to control, and keeps the power of double-circuit line identical;
(2) when a loop line road be that double-circuit line power control mode, another loop line road are while being the single back line power control mode, adopt the circuit of single back line power control mode to control by the power instruction of self, adopt the circuit of double-circuit line power control mode guaranteeing under the constant prerequisite of double-circuit line gross power, the power instruction that obtains this circuit according to the power instruction on another loop line road is controlled;
(3) when two loop line roads are the single back line power control mode, two loop line roads are controlled by power instruction separately;
(4), when the communication between double loop is broken down, automatically each loop line road is switched to the single back line power control mode;
(5) when a loop line road hinders tripping operation for some reason, corresponding series side converter blocking exits, and another loop line road and corresponding series side converter switch to single back line power control mode continuous service.
In Fig. 4, P
Ref1, P
Ref2The actual active power control command that means respectively circuit 1 and circuit 2, P
Set1, P
Set2Mean that respectively circuit 1 and circuit 2 are chosen as the active power set point of single back line power control mode, P
The set_ double backThe active power set point that means the double-circuit line power control mode.
The present invention introduces embodiment with the THE UPFC that is applied to double-circuit line, but the invention is not restricted to the system of double-circuit line and multi circuit transmission lines application THE UPFC, all be suitable for for the THE UPFC of many circuits that are applied to same transformer station starting point, different drop points.Anyly involve many circuits and install respectively within THE UPFC that series side converter, a plurality of series side converter share a side converter structure in parallel all belongs to the scope of the invention.
Finally should be noted that: only illustrate that in conjunction with above-described embodiment technical scheme of the present invention is not intended to limit.Those of ordinary skill in the field are to be understood that: those skilled in the art can modify or be equal to replacement the specific embodiment of the present invention, but these modifications or change are all within the claimed scope of the patent that application is awaited the reply.
Claims (9)
1. a THE UPFC, be applied to many circuits that have the multi circuit transmission lines of same starting point, same drop point and have same starting point, different drop points; It is characterized in that: comprise several series side converters, several series transformer, several first side winding by-pass switch, a side converter in parallel, a shunt transformer and a service entrance switch, wherein, the quantity of series side converter, series transformer and first side winding by-pass switch and circuit return number or number is identical and corresponding one by one; The interchange end of each series side converter connects the secondary side winding of its corresponding series transformer, the first side winding of described series transformer is the parallel connection first side winding by-pass switch corresponding with it, and described first side winding by-pass switch is connected in its corresponding circuit; The DC terminal parallel connection of described all series side converters, and jointly connect the DC terminal of side converter in parallel, the interchange end of described side converter in parallel connects an end of shunt transformer, and the other end of shunt transformer connects the ac bus of multi circuit transmission lines or many circuits via service entrance switch.
2. a kind of THE UPFC as claimed in claim 1, is characterized in that: the voltage-source type converter of described series side converter and side converter in parallel employing two level structures, transformer multiple inverter configuration or modular multilevel structure.
3. a kind of THE UPFC as claimed in claim 1, it is characterized in that: described series transformer comprises three single-phase transformers, the first side winding of three single-phase transformers seals in respectively three-phase line, and the star-like or angle type of the secondary side winding of three single-phase transformers joins.
4. a kind of THE UPFC as claimed in claim 1, it is characterized in that: the secondary side winding of described series transformer also is parallel with mechanical by-pass switch or thyristor bypass switch.
5. a kind of THE UPFC as claimed in claim 1, is characterized in that: the starting circuit of connecting between described side converter in parallel and shunt transformer.
6. a kind of THE UPFC as claimed in claim 5, it is characterized in that: described starting circuit comprises resistance parallel with one another and switch.
7. control method based on THE UPFC as claimed in claim 1, described control method is applicable to be applied in the THE UPFC of double-circuit line; It is characterized in that: each loop line road is chosen as double-circuit line power control mode or single back line power control mode, communication mutually between double-circuit line, and control method is as follows:
(1) when two loop line roads are the double-circuit line power control mode, a selected wherein loop line road is carried out power division as the master control circuit to double-circuit line, each loop line road selects the power instruction of master control circuit output to control, and keeps the power of double-circuit line identical;
(2) when a loop line road be that double-circuit line power control mode, another loop line road are while being the single back line power control mode, adopt the circuit of single back line power control mode to control by the power instruction of self, adopt the circuit of double-circuit line power control mode guaranteeing under the constant prerequisite of double-circuit line gross power, the power instruction that obtains this circuit according to the power instruction on another loop line road is controlled;
(3) when two loop line roads are the single back line power control mode, two loop line roads are controlled by power instruction separately.
8. the control method of a kind of THE UPFC as claimed in claim 7, is characterized in that described control method also comprises following content: when the communication between double-circuit line is broken down, automatically each loop line road is switched to the single back line power control mode;
9. the control method of a kind of THE UPFC as claimed in claim 7, it is characterized in that described control method also comprises following content: when a loop line road hinders tripping operation for some reason, corresponding series side converter blocking exits, and another loop line road and corresponding series side converter switch to single back line power control mode continuous service.
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| CN103825262A (en) * | 2014-03-18 | 2014-05-28 | 国家电网公司 | Fault current limiter of double-circuit line |
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