CN103986342A - Power electronic current converter and control method capable of eliminating two-way fault current - Google Patents
Power electronic current converter and control method capable of eliminating two-way fault current Download PDFInfo
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Abstract
The invention provides a power electronic current converter and a control method capable of eliminating two-way fault current. The current converter comprises current conversion bridge arms connected through electric reactors. The current conversion bridge arms comprise T-shaped power submodules connected in series. The two horizontal ends of one T-shaped power submodule are connected through a capacitor and then connected with the vertical end of another T-shaped power submodule. The current conversion bridge arms are sequentially connected through the vertical ends, the electric reactors and the horizontal ends. Submodule controllers and optical fiber current mutual inductors of the current conversion bridge arms are connected with current conversion bridge arm controllers through optical fibers. The current conversion bridge arm controllers are connected with a current converter master controller. According to the control method, dual fault current protection is carried out on the power electronic current converter through a current detection method for a driving circuit and the current conversion bridge arms of a fully-controlled device. Compared with the prior art, the power electronic current converter and the control method capable of eliminating the two-way fault current can rapidly and effectively eliminate the two-way fault current.
Description
Technical field
The present invention relates to a kind of power electronics converter and control method, be specifically related to a kind of power electronics converter and the control method that can remove bi-directional failure electric current.
Background technology
Technology of HVDC based Voltage Source Converter and Survey of Flexible AC Transmission System Technology are being brought into play the effect becoming more and more important in intelligent grid construction and generation of electricity by new energy field; Because short trouble in electric power system is the most serious damage, therefore guarantee the normal operation of flexible DC power transmission and Survey of Flexible AC Transmission System, need to remove short trouble by power electronics converter; Based on principle, divide, change of current stream device is processed short-circuit current and is comprised:
1.: utilize other equipment of converter alternating current-direct current side (as AC and DC circuit breaker) isolated fault point;
Wherein, DC circuit breaker is not yet extensively approved and is applied in high voltage direct current field; AC circuit breaker is because mechanical switch response is slower, and the fast motion time is 40-60ms, is difficult to the fast transient process of response power electronic system Millisecond, and repeatedly cut-offs the life-span that can shorten AC circuit breaker.For example, when in prior art, flexible DC power transmission engineering is by AC circuit breaker disengagement failure electric current, each DC side fault all can cause flexible DC power transmission system to stop transport, and has seriously responded system availability.
2.: utilize converter self to control the removing that realizes fault current;
Power electronics converter is combined by one or more power submodules conventionally, so the performance of converter directly depends on the performance of adopted power submodule.General two level converters or the modularization multi-level converter etc. of adopting of the power electronics converter in flexible DC power transmission field in prior art.Wherein, two level converters mainly adopt bridge-type topology; The power cell that modularization multi-level converter adopts comprises the multiple power submodules such as bridge-type submodule, semi-bridge type submodule or clamp Shuangzi module:
When Converter DC-side is short-circuited fault, bridge-type submodule (with two level converters) can cut off by locking the electric current of twocouese, but it needs the semiconductor device of double amount, invests excessive; Semi-bridge type submodule, flows back to road and uncontrollable because itself and the antiparallel diode of IGBT device can form the energy feedback that fault point is directly connected with AC system, does not therefore possess direct current locking function; Clamp Shuangzi module, although the semiconductor device adopting is fewer than bridge-type sub modular structure, but the feature due to self topological structure, the electric capacity of system clamp Shuangzi module after locking can charge repeatedly, required time of cutting-off of short-circuit electric current is longer than bridge-type, and it is unsatisfactory that fault current is controlled effect.
Therefore, due to limiting short-circuit current effectively, very easily there is overcurrent locking or tripping operation in the existing high-power electric and electronic converter based on full control device when the system failure, seriously reduced the availability factor of device and the safety and stability level of electric power system.Provide a kind of novel electric power electric converter that can remove fault ability to seem particularly important.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of power electronics converter that can remove bi-directional failure electric current, described converter comprises the change of current brachium pontis connecting by reactor, described change of current brachium pontis comprises the T shape power submodule being connected in series; Between the horizontal ends of described T shape power submodule, be arranged in parallel a DC capacitor; Submodule controller is all connected with converter bridge arm controller by optical fiber with the optical fiber current mutual inductor on described change of current brachium pontis; Described change of current brachium pontis is connected with converter master controller.
Preferably, three branch roads of described T shape power submodule include the full-control type device being connected in series; Described full-control type device adopts any one in power electronic device IGBT, IGCT and GTO;
Preferably, the horizontal ends of described T shape power submodule comprises the power electronic device arranging in the same way; Power electronic device collector electrode in the vertical end of described T shape power submodule is connected with the tie point of described horizontal ends;
Preferably, the T shape power submodule in described change of current brachium pontis is connected with the power electronic device emitter of horizontal ends successively by described vertical end; Between described change of current brachium pontis, by described vertical end, reactor, be connected successively with the power electronic device emitter of described horizontal ends;
Preferably, a by-pass switch in parallel between the horizontal ends by power electronic device collector electrode vertical connecting end and described vertical end in described T shape power submodule;
Preferably, between described power electronic device collector electrode and emitter, inverse parallel arranges a diode;
Preferably, the drive circuit of all full-control type devices in described T shape power submodule is all connected with converter bridge arm controller by submodule controller;
A kind of removing bi-directional failure current control method that adopts above-mentioned power electronics converter provided by the invention, comprising:
Step 1: the judgement electric power system DC side fault that is short-circuited, locking converter;
Step 2: after described converter blocking 200ms, converter master controller issues the instruction of release converter; And
Step 3: judge whether described converter restarts; If restart failure, Permanent lockout converter.
Preferably, in described step 1, locking converter comprises:
Optical fiber current mutual inductor detects the current signal that flows through change of current brachium pontis in real time, and converter bridge arm controller compares described current signal and current threshold, the fault thereby judgement electric power system DC side is short-circuited; Described converter bridge arm controller issues the instruction of locking converter to submodule controller;
Preferably, in described step 1, locking converter comprises:
Electric power system DC side is short-circuited after fault, the drive circuit action locking T shape power submodule in change of current brachium pontis, thereby the fault current of excision change of current brachium pontis; Described submodule controller sends locking T shape power submodule locking information to described converter bridge arm controller.
Compare with immediate prior art, excellent effect of the present invention is:
1, in technical solution of the present invention, the T shape power submodule based on full-control type device can excise two-way fault current, thereby assurance power electronics converter is effectively removed bi-directional failure electric current;
2, in technical solution of the present invention, T shape power submodule adopts full control shape device disengagement failure electric current, and fast response time, selectivity are good;
3, in technical solution of the present invention, in change of current brachium pontis, optical fiber current mutual inductor is set, there is good broadband properties, do not have saturation problem, can fast detecting failure electric current, be applicable to flexible DC power transmission field;
4,, in technical solution of the present invention, by the drive circuit of full-control type device and the electric current detecting method of change of current brachium pontis, power electronics converter is carried out to double faults current protection;
5, in technical solution of the present invention, adopt converter bridge arm controller can realize the circulation control between change of current brachium pontis, the control of capacitance voltage balance and the change of current brachium pontis fault-current protection function of T shape power submodule, fault judgement speed is fast, accuracy rate is high.
6,, in technical solution of the present invention, the coordination that adopts converter master controller to realize converter and electric power system is controlled, and has improved safety and stability level and the reliability of converter.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is: two level converter structure charts;
Fig. 2 is: MMC type modularization multi-level converter structure chart;
Fig. 3 is: bridge-type sub modular structure figure;
Fig. 4 is: semi-bridge type sub modular structure figure;
Fig. 5 is: clamp Shuangzi modular structure figure;
Fig. 6 is: fault paths figure during Converter DC-side short circuit;
Fig. 7 is: a kind of power electronics converter structure figure that can remove bi-directional failure electric current in the embodiment of the present invention;
Fig. 8 is: T shape sub modular structure figure in the embodiment of the present invention;
Fig. 9 is: the structure chart of single full control device in the shape of T shown in Fig. 8 submodule;
Figure 10 is: the fault paths figure during power electronics Converter DC-side short circuit that can remove bi-directional failure electric current in the embodiment of the present invention;
Figure 11 is: T shape submodule charging working state schematic representation in the embodiment of the present invention;
Figure 12 is: T shape submodule electric discharge working state schematic representation in the embodiment of the present invention;
Figure 13 is: T shape submodule bypass working state schematic representation in the embodiment of the present invention;
Figure 14 is: T shape submodule locking excision working state schematic representation in the embodiment of the present invention;
Figure 15 is: the power electronics converter DC Line Fault control & protection strategy figure that can remove bi-directional failure electric current in the embodiment of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
As Fig. 1-2 shows respectively two level converters and the MMC type modularization multi-level converter structure chart conventionally adopting in flexible DC power transmission field, wherein the power cell in MMC type modularization multi-level converter can adopt bridge-type sub modular structure, semi-bridge type sub modular structure and clamp Shuangzi modular structure, as in Figure 3-5, the electric pressure of the bridge-type submodule shown in Fig. 3 is lower than the electric pressure of two level converters shown in Fig. 1;
When Converter DC-side is short-circuited fault, two level converters or bridge-type submodule cut off the electric current of twocouese by locking as shown in Figure 6, but need the semiconductor device of double amount, invest excessive; In semi-bridge type submodule, owing to can forming with the antiparallel diode of power electronic device the energy feedback that fault point is directly connected with AC system, flow back to road and uncontrollable, therefore do not possess direct current locking function; Clamp Shuangzi module its electric capacity after locking can charge repeatedly, and the short circuit current mute time is longer, so fault current control effect is undesirable.
The defect that can not effectively remove fault current for overcoming power electronics converter in prior art, the invention provides a kind of power electronics converter as shown in Figure 7;
In the present embodiment, power electronics converter is three-phase converter, comprises six change of current brachium pontis, reactor, optical fiber current mutual inductor, converter bridge arm controller and converter master controller; Change of current brachium pontis is connected in series by reactor; Each change of current brachium pontis is equiped with optical fiber current mutual inductor; Converter bridge arm controller is directly connected with converter master controller;
1.: converter master controller, for realizing the stable operation of converter and electric power system, coordinate to control, to converter bridge arm controller, issue the instruction of change of current brachium pontis reference voltage; After removing, electric power system dc-side short-circuit fault issues the instruction of release converter simultaneously
2.: converter bridge arm controller, for be converted to the switch triggering signal of each submodule with reference to voltage instruction, the circulation of realizing between change of current brachium pontis is controlled, and the electric capacity of submodule, the balance of voltage are controlled;
Optical fiber current mutual inductor is for detection of the current signal in change of current brachium pontis, and carried out sending to converter bridge arm controller after photosignal conversion; Converter bridge arm controller carries out the judgement of electric power system dc-side short-circuit fault according to current signal, and issues the instruction of locking converter;
3.: submodule controller, for receiving and resolve switch triggering signal, is converted into the driving signal of power electronic device; The running status that detects T shape power submodule, sends to converter bridge arm controller by running state information; When T shape power submodule operation exception, submodule controller can move the power electronic device in locking T shape power submodule in time, switches the running status of T shape power submodule.
Change of current brachium pontis comprise T shape power submodule SM1, SM2 that N is connected in series ... SMN; The structure of each T shape power submodule as shown in Figure 8, comprises full-control type device, drive circuit, by-pass switch K
smwith T shape power submodule;
1.: full-control type device adopts any one in power electronic device IGBT, IGCT and GTO, the collector electrode of each full-control type device and the inverse parallel of emitter two ends arrange diode D1, a D2 ... DM;
2.: in a change of current brachium pontis, between two horizontal ends of each T shape power submodule, be arranged in parallel a DC capacitor; The horizontal ends of T shape power submodule comprises the power electronic device arranging in the same way; The collector electrode of power electronic device and the tie point of horizontal ends in the vertical end of T shape power submodule are connected;
3.: the series system of T shape power submodule is: a T shape power submodule in change of current brachium pontis is by vertically holding and be connected successively with the power electronic device emitter of another T shape power submodule horizontal ends;
The connected mode of change of current brachium pontis is: vertical end, reactor by T shape power submodule in a change of current brachium pontis between change of current brachium pontis are connected successively with the power electronic device emitter of the horizontal ends of T shape power submodule in another change of current brachium pontis.
4.: drive circuit is connected with the gate pole of power electronic device, drive circuit GU1, GU2 ... GUM; All drive circuits in a T shape power submodule are connected with converter bridge arm controller after being all connected with a sub-module controller, submodule controller SMC1, SMC2 ... SMCN; Horizontal ends by full-control type device collector electrode vertical connecting end in this T shape power submodule and this be a by-pass switch K in parallel between end vertically
sm; Three branch roads of T shape power submodule include M the full control shape device being connected in series, as shown in Figure 9.
As shown in figure 10, in the present embodiment, based on the three-phase converter that can remove the power electronics converter structure of bi-directional failure electric current provided by the invention, its specific works process is:
When electric power system DC side is normally worked, the power electronic device in Figure 10 on the vertical branch road of T shape power submodule is normal open state, and the power electronic device in two horizontal branches is charged, discharged and bypass according to modulation strategy; During electric power system dc-side short-circuit fault, all electric power electric devices and diode in T shape power submodule are shutoff, thus locking converter;
Following table shows the modulation strategy of power electronic device:
1.: pattern one; As shown in figure 11, power electronics converter T in T shape submodule
1and T
2turn-off diode D
1and D
3conducting, D
2turn-off capacitor charging;
2.: pattern two; As shown in figure 12, power electronics converter T in T shape submodule
2shutoff, T
1conducting, diode D
3conducting, D
1and D
2turn-off capacitor discharge;
3.: pattern three; As shown in figure 13, power electronics converter T in T shape submodule
1shutoff, T
2conducting, diode D
3conducting, D
1and D
2turn-off the bypass of change of current brachium pontis;
4.: pattern four; As shown in figure 14, power electronics converter T in T shape submodule
1and T
2turn-off diode D
1, D
2and D
3turn-off change of current brachium pontis locking excision.
The control method that the power electronics converter that can remove bi-directional failure electric current provided by the invention is short-circuited after fault in electric power system DC side is:
(1) the judgement electric power system DC side fault that is short-circuited, locking converter;
As shown in figure 15,1.: current transformer detects the current signal of change of current brachium pontis in real time, converter bridge arm controller compares current signal and current threshold, according to current signal amplitude, whether occur out-of-limit, the judgement electric power system DC side fault that is short-circuited, converter bridge arm controller issues the instruction of locking converter to T shape submodule controller;
2.: electric power system DC side is short-circuited after fault, system produces very large short circuit current, and the drive circuit in change of current brachium pontis is according to the voltage action between the gate pole-emitter of power electronic device, locking T shape power submodule; Because T shape power submodule is connected in series, thus the fault current of excision change of current brachium pontis, and T shape submodule controller sends the locking information of locking T shape power submodule to converter bridge arm controller simultaneously.
(2), after converter blocking 200ms, converter master controller issues the instruction of release converter;
(3) judge whether converter restarts, if electric current recovers normally to start successfully;
If restart successfully, converter normally moves; If restart failure, Permanent lockout converter.
Finally should be noted that: described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
Claims (10)
1. can remove a power electronics converter for bi-directional failure electric current, described converter comprises the change of current brachium pontis connecting by reactor, it is characterized in that, described change of current brachium pontis comprises the T shape power submodule being connected in series; Between the horizontal ends of described T shape power submodule, be arranged in parallel a DC capacitor; Submodule controller is all connected with converter bridge arm controller by optical fiber with the optical fiber current mutual inductor on described change of current brachium pontis; Described change of current brachium pontis is connected with converter master controller.
2. a kind of power electronics converter that can remove bi-directional failure electric current as claimed in claim 1, is characterized in that, three branch roads of described T shape power submodule include the full-control type device being connected in series; Described full-control type device adopts any one in power electronic device IGBT, IGCT and GTO.
3. a kind of power electronics converter that can remove bi-directional failure electric current as claimed in claim 2, is characterized in that, the horizontal ends of described T shape power submodule comprises the power electronic device arranging in the same way; Power electronic device collector electrode in the vertical end of described T shape power submodule is connected with the tie point of described horizontal ends.
4. a kind of power electronics converter that can remove bi-directional failure electric current as claimed in claim 3, is characterized in that, the T shape power submodule in described change of current brachium pontis is connected with the power electronic device emitter of horizontal ends successively by described vertical end; Between described change of current brachium pontis, by described vertical end, reactor, be connected successively with the power electronic device emitter of described horizontal ends.
5. a kind of power electronics converter that can remove bi-directional failure electric current as claimed in claim 3, it is characterized in that a by-pass switch in parallel between the horizontal ends by power electronic device collector electrode vertical connecting end in described T shape power submodule and described vertical end.
6. a kind of power electronics converter that can remove bi-directional failure electric current as claimed in claim 2, is characterized in that, between described power electronic device collector electrode and emitter, inverse parallel arranges a diode.
7. a kind of power electronics converter that can remove bi-directional failure electric current as claimed in claim 2, is characterized in that, the drive circuit of all full-control type devices in described T shape power submodule is all connected with converter bridge arm controller by submodule controller.
8. a removing bi-directional failure current control method for the power electronics converter of employing as described in claim 1-7, is characterized in that, described method comprises:
Step 1: the judgement electric power system DC side fault that is short-circuited, locking converter;
Step 2: after described converter blocking 200ms, converter master controller issues the instruction of release converter; And
Step 3: judge whether described converter restarts; If restart failure, Permanent lockout converter.
9. control method as claimed in claim 8, is characterized in that, in described step 1, locking converter comprises:
Optical fiber current mutual inductor detects the current signal that flows through change of current brachium pontis in real time, and converter bridge arm controller compares described current signal and current threshold, the fault thereby judgement electric power system DC side is short-circuited; Described converter bridge arm controller issues the instruction of locking converter to submodule controller.
10. control method as claimed in claim 8, is characterized in that, in described step 1, locking converter comprises:
Electric power system DC side is short-circuited after fault, the drive circuit action locking T shape power submodule in change of current brachium pontis, thereby the fault current of excision change of current brachium pontis; Described submodule controller sends locking T shape power submodule locking information to described converter bridge arm controller.
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| CN201410234085.XA CN103986342B (en) | 2014-05-29 | 2014-05-29 | A kind of power electronics inverter that can remove bi-directional failure electric current and control method |
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| CN104865462A (en) * | 2015-04-10 | 2015-08-26 | 南京南瑞继保电气有限公司 | Fault processing method and device |
| CN104953856A (en) * | 2015-06-12 | 2015-09-30 | 中国科学院电工研究所 | Submodule topology |
| CN105429496A (en) * | 2015-12-31 | 2016-03-23 | 北京四方继保自动化股份有限公司 | Modular multilevel converter with DC fault elimination function |
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| CN106026048A (en) * | 2016-07-15 | 2016-10-12 | 浙江大学 | DC grid fault handling strategy based on in-situ detection and in -situ protection |
| CN106602531A (en) * | 2016-10-18 | 2017-04-26 | 华北电力大学 | Bridge arm bypass protection circuit of modularization multi-level converter aiming at direct current short circuit fault |
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| CN104865462B (en) * | 2015-04-10 | 2018-11-13 | 南京南瑞继保电气有限公司 | A kind of fault handling method and device |
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| CN106602531B (en) * | 2016-10-18 | 2019-04-02 | 华北电力大学 | Bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure |
| CN106602531A (en) * | 2016-10-18 | 2017-04-26 | 华北电力大学 | Bridge arm bypass protection circuit of modularization multi-level converter aiming at direct current short circuit fault |
| CN107612400A (en) * | 2017-09-30 | 2018-01-19 | 南方电网科学研究院有限责任公司 | Voltage source type converter, hybrid direct-current power transmission system and starting method thereof |
| CN109361200A (en) * | 2018-11-26 | 2019-02-19 | 广东电网有限责任公司 | Failure cuts localization method and relevant apparatus and fault isolation system fastly |
| CN110277935A (en) * | 2019-07-17 | 2019-09-24 | 广东电网有限责任公司 | A kind of bypass control method of modularization multi-level converter fault power module |
| CN112332685A (en) * | 2020-01-09 | 2021-02-05 | 华北电力大学 | AC/DC converter and DC fault clearing method |
| CN112332685B (en) * | 2020-01-09 | 2021-10-15 | 华北电力大学 | AC/DC converter and DC fault clearing method |
| CN111786355A (en) * | 2020-06-23 | 2020-10-16 | 上海电器科学研究所（集团）有限公司 | Protection device and protection method for restraining short circuit of direct current bus support capacitor |
| 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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