CN105186551A - Current-limiting unified power flow controller and method based on modular multi-level current converter - Google Patents
Current-limiting unified power flow controller and method based on modular multi-level current converter Download PDFInfo
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- CN105186551A CN105186551A CN201510581688.1A CN201510581688A CN105186551A CN 105186551 A CN105186551 A CN 105186551A CN 201510581688 A CN201510581688 A CN 201510581688A CN 105186551 A CN105186551 A CN 105186551A
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- 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
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a current-limiting unified power flow controller based on a modular multi-level current converter, and a control method thereof. One end of a parallel transformer is connected with one end of a high-voltage power transmission line, the other end of the parallel transformer is connected with a parallel rectifying side based on the modular multi-level current converter through a circuit, the parallel rectifying side based on the modular multi-level current converter is connected with a serial inverting side based on the modular multi-level current converter through a DC bus, and the serial inverting side based on the modular multi-level current converter and a three-phase bridge type solid state current limiter are each connected with a serial transformer through a circuit. The current-limiting unified power flow controller and the control method thereof have the advantages of high extensibility, good output waveform, high redundant fault-tolerant capability and the like, can significantly improve the waveform quality of the output voltage by modulating extensible level number through an appropriate method, improve the reliability and stability of the system, and allow the system to have a short-circuit current limiting function.
Description
Technical field
The present invention relates to power electronics and direct current transportation field, particularly relate to a kind of current-limiting type THE UPFC based on modularization multi-level converter and method.
Technical background
Along with the development of flexible AC transmitting system, a large amount of flexible apparatus is widely used in electric power system, and THE UPFC (UPFC) is the representative of third generation FACTS device, and it is powerful, can be the control device that electrical network provides advanced, get the attention.
And at present both at home and abroad about the research of UPFC mainly concentrates on engineer applied, control strategy aspect, it is extensively based on two level topologys, the three-level topology of IGBT.And two level and three-level topology structure harmonic content are greatly, system side needs to install additional filter, and cost is high, and floor space is large.Simultaneously UPFC major function carries out power flow regulating, but along with the development of electrical network scale, line short fault happens occasionally, the fault if system is short-circuited, and short-circuit impact electric current can only be prevented the destruction of device and system by the mode of shutdown system.
And modularization multi-level converter (MMC) adopts modularized design, easy to assembly, harmonic content is low, three-phase bridge solid-state current limiter (FCL) is introduced in UPFC system cleverly simultaneously, in conjunction with the short-circuit current-limiting function of FCL, the supply shortage of the non-renewable energy resources such as oil, coal, natural gas, and the environmental pollution using non-renewable energy resources to bring is day by day serious, the development and utilization of countries in the world to the renewable and clean energy resource such as wind energy, solar energy is also more and more paid attention to.Proportion shared by renewable energy power generation also improves rapidly.
Summary of the invention
Object of the present invention is intended to the deficiency for existing THE UPFC, provides a kind of current-limiting type THE UPFC based on modularization multi-level converter.
A kind of current-limiting type THE UPFC based on modularization multi-level converter comprises: shunt transformer, ultra-high-tension power transmission line, the rectification side in parallel based on modularization multi-level converter, the series resonant inverter side based on modularization multi-level converter, series transformer, three-phase bridge solid-state current limiter; One end of shunt transformer connects one end of ultra-high-tension power transmission line, the other end of shunt transformer is connected with the side in parallel based on modularization multi-level converter by circuit, rectification side in parallel based on modularization multi-level converter is connected by DC bus with between the series resonant inverter side based on modularization multi-level converter, is connected respectively by circuit based on the series resonant inverter side of modularization multi-level converter, three-phase bridge solid-state current limiter with series transformer.
The submodule of the described rectification side in parallel based on modularization multi-level converter is made up of half H bridge, and the primary structure of submodule is made up of insulated gate bipolar transistor, for being direct current by three-phase alternating current electric rectification, and the busbar voltage of stable DC side.
The submodule of the described series resonant inverter side based on modularization multi-level converter is made up of half H bridge, the primary structure of submodule is made up of insulated gate bipolar transistor, for being three-phase alternating current by DC inverter, and export the voltage after overregulating to system.
Submodule quantity in described modularization multi-level converter is N, N can be any positive integer be of practical significance.
Control method based on the current-limiting type THE UPFC of modularization multi-level converter is: three-phase alternating current transfers to system by the shunt transformer be connected with ultra-high-tension power transmission line, by the rectification of the described rectification side in parallel based on modularization multi-level converter, be direct current by three-phase alternating current electric rectification, the described rectification side in parallel based on modularization multi-level converter adopts voltage-to-current dicyclo PI to control, adopt the modulator approach that nearest level approaches simultaneously, direct current is three-phase alternating current by the described series resonant inverter side inversion based on modularization multi-level converter, the described series resonant inverter side based on modularization multi-level converter adopts the PI control method of power outer shroud and current inner loop, three-phase alternating current is sent back to ultra-high-tension power transmission line by series transformer, thus the voltage completed system, the effect of comprehensive compensation is carried out in phase angle and impedance.
The invention has the beneficial effects as follows, due to adding of modularization multi-level converter (MMC), make the connection in series-parallel side of UPFC all be provided with the feature of modularized design, the voltage current waveform harmonic content therefore after system fading margin is very low.Adding due to three-phase bridge solid-state current limiter simultaneously; so make UPFC be provided with the limitation capability of short-circuit current; available protecting UPFC module is not damaged by the impact of short circuit current; efficiently solve the short circuit current problem that UPFC faces in system is applied; reduce the short circuit current level of system, for system safety stable operation provides Reliable guarantee.
Accompanying drawing explanation
Fig. 1 is the circuit topological structure figure of the current-limiting type THE UPFC based on modularization multi-level converter;
Fig. 2 is the circuit topological structure figure of modularization multi-level converter;
Fig. 3 is three-phase bridge solid-state current limiter circuit topological structure figure;
Modularization multi-level converter series side outlet A phase phase voltage reference waveform figure when Fig. 4 is steady operation;
The facilities of input system active-power P and reactive power Q when Fig. 5 a is transient state work;
Modularization multi-level converter series side A phase upper and lower bridge arm current response reference waveform figure when Fig. 5 b is transient state work;
The three-phase voltage response reference waveform figure of THE UPFC when Fig. 6 is short trouble;
Current response when Fig. 7 is short trouble on three-phase solid bridge-type flow restricter module inductance.
Embodiment
Below in conjunction with Figure of description, the invention will be further described.
As shown in Figure 1, a kind of current-limiting type THE UPFC based on modularization multi-level converter comprises: shunt transformer 1, ultra-high-tension power transmission line 2, the rectification side in parallel 3 based on modularization multi-level converter, the series resonant inverter side 4 based on modularization multi-level converter, series transformer 5, three-phase bridge solid-state current limiter 6; One end of shunt transformer 1 connects one end of ultra-high-tension power transmission line 2, the other end of shunt transformer 1 is connected with the side in parallel 3 based on modularization multi-level converter by circuit, rectification side in parallel 3 based on modularization multi-level converter is connected by DC bus with between the series resonant inverter side 4 based on modularization multi-level converter, is connected respectively by circuit based on the series resonant inverter side 4 of modularization multi-level converter, three-phase bridge solid-state current limiter 6 with series transformer 5.
The submodule of the described rectification side in parallel 3 based on modularization multi-level converter is made up of half H bridge, and the primary structure of submodule is made up of insulated gate bipolar transistor, for being direct current by three-phase alternating current electric rectification, and the busbar voltage of stable DC side.
The submodule of the described series resonant inverter side 4 based on modularization multi-level converter is made up of half H bridge, the primary structure of submodule is made up of insulated gate bipolar transistor, for being three-phase alternating current by DC inverter, and export the voltage after overregulating to system.
As shown in Figure 2, described modularization multi-level converter comprises 2 IGBT, 2 diodes and an electric capacity, the inverse parallel of 2 diode difference is between the collector and emitter of 2 IGBT, the emitter of upper IGBT is connected with the collector electrode of lower IGBT, the collector electrode of upper IGBT is connected with the positive pole of electric capacity, the lower emitter of IGBT is connected with the negative pole of electric capacity, and the emitter of upper IGBT is connected with outside as two ports with the collector electrode of lower IGBT.Submodule quantity in described modularization multi-level converter is N, N can be any positive integer be of practical significance.
Described series transformer series connection is in described ultra-high-tension power transmission line.
As shown in Figure 3, described three-phase bridge solid-state current limiter is made up of 8 thyristor T1 ~ T8, and wherein T1, T3, T5 form three-phase A, the upper brachium pontis of B, C, and its negative pole is connected, T2, T4, T6 forms three-phase A, and the lower brachium pontis of B, C and its positive pole are connected, and T7 is connected in series T8 as fly-wheel diode, current-limiting inductance
ld is connected in parallel on T7, T8 two ends, and the negative pole of T7,
lthe positive pole of d and the negative pole of T1, T3, T5 are connected, the positive pole of T8,
lthe negative pole of d and the positive pole of T2, T4, T6 are connected.The output of described three-phase bridge solid-state current limiter is connected with series transformer.
Control method based on the current-limiting type THE UPFC of modularization multi-level converter is: three-phase alternating current transfers to system by the shunt transformer 1 be connected with ultra-high-tension power transmission line 2, by the rectification of the described rectification side in parallel 3 based on modularization multi-level converter, be direct current by three-phase alternating current electric rectification, the described rectification side in parallel 3 based on modularization multi-level converter adopts voltage-to-current dicyclo PI to control, adopt the modulator approach that nearest level approaches simultaneously, direct current is three-phase alternating current by described series resonant inverter side 4 inversion based on modularization multi-level converter, the described series resonant inverter side 4 based on modularization multi-level converter adopts the PI control method of power outer shroud and current inner loop, three-phase alternating current is sent back to ultra-high-tension power transmission line 2 by series transformer 5, thus the voltage completed system, the effect of comprehensive compensation is carried out in phase angle and impedance.
It is high that the current-limiting type THE UPFC that the present invention is based on modularization multi-level converter has applicable electric pressure compared with existing flow controller, current harmonics is little, can the effect of quick limiting short-circuit current under short circuit fault condition, this topology adds the fail safe of electrical network, reliability, larger economic benefit can be brought to electric power system, topological structure adopts nearest level to approach the modulator approach of (NLM), NLM implementation method is simple, switching frequency is low, switching loss is little, hardware circuit realizes simple, algorithm is simple, be highly suitable for the MMC that submodule number is a lot.
When system cloud gray model is in stable situation, this current-limiting type THE UPFC is equivalent to traditional flow controller, and the A phase phase voltage burr of series resonant inverter side outlet is few, and fluctuate little, as shown in Figure 4, waveform quality obtains effective lifting.When system cloud gray model is in transient state situation, in order to verify carry topology transient performance, arrange system input active-power P, reactive power Q changes, as shown in Figure 5, Fig. 5 a shows P, the dynamic tracking effect of Q, Fig. 5 b is then the current response situation of the upper and lower brachium pontis of system A phase, can find out and work as P, after Q changes, the bridge arm current of system can respond rapidly at short notice and reach new steady s tate.Simultaneously under normal operating conditions, the normal triggering and conducting of all thyristor T1 ~ T8 in flow restricter module, when device starts, system first by three-phase bridge rectifier circuit to direct current current-limiting inductance
ld charging makes its electric current reach the peak value of system alternating current, enters steady operation immediately.180 ° of electrical degrees of two thyristor alternations up and down of same phase brachium pontis, 3 are had to be in conducting state in any instant T1 ~ T6, due to the current source effect of inductance, when negligible resistance, DC inductance electric current keeps constant in alternating current peak level, and the difference of itself and alternating current is by continued flow tube T7 and T8 afterflow.Due to the conducting of continued flow tube, the DC side of three-phase bridge rectifier circuit is by short circuit, that is three terminals at flow restricter module AC node O place are equivalent to short circuit, flow restricter module presents zero impedance, and whole current-limiting type UPFC device is equivalent to conventional UPFC and carries out comprehensive compensation to the voltage of system, phase angle and impedance.Also identical with conventional UPFC to the control method of UPFC module, be only often add trigger impulse to all thyristors to the control of flow restricter module, the complexity adding not increase device control of visible flow restricter module.
A place near device mounting points in (i.e. Fig. 1) be short-circuited fault time, short dot voltage jump is zero, whole system power source voltage is applied to suddenly on series transformer, and by being added to flow restricter module DC side after three-phase bridge circuit rectification, DC voltage is caused to increase suddenly, continued flow tube T7 and T8 is forced to turn off because bearing reverse voltage, direct current current-limiting inductance
ld is automatically connected into series transformer secondary loop immediately and then is coupled to former sideline road with limiting short-circuit current and climbing thereof.Flow restricter module when Fig. 6 shows short trouble
lthe current response situation of d, meanwhile, corresponding actions is taked immediately after apparatus control system detects confirmation fault, in 20ms, the short circuit current of series transformer secondary will cut off automatically, whole device is equivalent to open circuit, effectively protect UPFC module not damage by the impact of short circuit current, and efficiently solve UPFC and apply faced short circuit current problem in system, and reduce the short circuit current level of system, Fig. 7 shows system three-phase voltage response condition in case of a fault, system voltage can in the i.e. rapid vanishing of about 10ms, effectively inhibit it to the destruction of system and device, for system safety stable operation provides reliable guarantee.
Claims (5)
1. based on a current-limiting type THE UPFC for modularization multi-level converter, it is characterized in that comprising: shunt transformer (1), ultra-high-tension power transmission line (2), the rectification side in parallel (3) based on modularization multi-level converter, the series resonant inverter side (4) based on modularization multi-level converter, series transformer (5), three-phase bridge solid-state current limiter (6); One end of shunt transformer (1) connects one end of ultra-high-tension power transmission line (2), the other end of shunt transformer (1) is connected with the side in parallel (3) based on modularization multi-level converter by circuit, rectification side in parallel (3) based on modularization multi-level converter is connected by DC bus with between the series resonant inverter side (4) based on modularization multi-level converter, is connected respectively by circuit based on the series resonant inverter side (4) of modularization multi-level converter, three-phase bridge solid-state current limiter (6) with series transformer (5).
2. a kind of current-limiting type THE UPFC based on modularization multi-level converter according to claim 1, it is characterized in that the submodule of the described rectification side in parallel (3) based on modularization multi-level converter is made up of half H bridge, the primary structure of submodule is made up of insulated gate bipolar transistor, for being direct current by three-phase alternating current electric rectification, and the busbar voltage of stable DC side.
3. a kind of current-limiting type THE UPFC based on modularization multi-level converter according to claim 1, it is characterized in that the submodule of the described series resonant inverter side (4) based on modularization multi-level converter is made up of half H bridge, the primary structure of submodule is made up of insulated gate bipolar transistor, for being three-phase alternating current by DC inverter, and export the voltage after overregulating to system.
4., according to a kind of current-limiting type THE UPFC based on modularization multi-level converter described in Claims 2 or 3, the submodule quantity that it is characterized in that in described modularization multi-level converter is N, N can be any positive integer be of practical significance.
5. one kind uses as claimed in claim 1 based on the control method of the current-limiting type THE UPFC of modularization multi-level converter, it is characterized in that three-phase alternating current transfers to system by the shunt transformer (1) be connected with ultra-high-tension power transmission line (2), by the rectification of the described rectification side in parallel (3) based on modularization multi-level converter, be direct current by three-phase alternating current electric rectification, the described rectification side in parallel (3) based on modularization multi-level converter adopts voltage-to-current dicyclo PI to control, adopt the modulator approach that nearest level approaches simultaneously, direct current is three-phase alternating current by described series resonant inverter side (4) inversion based on modularization multi-level converter, the described series resonant inverter side (4) based on modularization multi-level converter adopts the PI control method of power outer shroud and current inner loop, three-phase alternating current is sent back to ultra-high-tension power transmission line (2) by series transformer (5), thus the voltage completed electrical network, the effect of comprehensive compensation is carried out in phase angle and impedance.
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Cited By (2)
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| CN109950916A (en) * | 2019-04-11 | 2019-06-28 | 华北电力大学 | UPFC failure based on mixed type impedance gets over method |
| CN112952791A (en) * | 2021-03-31 | 2021-06-11 | 中国科学院电工研究所 | DC power flow controller |
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Application publication date: 20151223 |