CN108512432B - Power electronic transformer with function of blocking bidirectional fault current - Google Patents
Power electronic transformer with function of blocking bidirectional fault current Download PDFInfo
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- CN108512432B CN108512432B CN201810589631.XA CN201810589631A CN108512432B CN 108512432 B CN108512432 B CN 108512432B CN 201810589631 A CN201810589631 A CN 201810589631A CN 108512432 B CN108512432 B CN 108512432B
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- power electronic
- electronic transformer
- recharging
- switching device
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 64
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 241000287828 Gallus gallus Species 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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]
Abstract
The power electronic transformer with the function of blocking the bidirectional fault current comprises a power electronic transformer, wherein a recharging current blocking module is connected in series between a high-voltage direct-current side output end of the power electronic transformer and a high-voltage direct-current transmission power grid; the recharging current blocking module is formed by connecting a plurality of switching devices which are reversely connected with a freewheeling diode in parallel in series; the on and off of a switching device in the recharging current blocking module are controlled by detecting the direction and the magnitude of the fault current at the high-voltage direct-current side of the power electronic transformer, so that the fault current is prevented from recharging the power electronic transformer, the power electronic transformer is protected from overvoltage and overcurrent problems, and the device is prevented from being damaged; the recharging current blocking module has the function of preventing fault current from flowing from a direct-current fault point to the power electronic transformer side, so that a system added with the blocking module can have the function of bidirectionally blocking the direct-current fault current.
Description
Technical Field
The invention relates to the technical field of power electronic transformers, in particular to a power electronic transformer with a bidirectional fault current blocking function.
Background
In a hvdc transmission system, a power electronic transformer is used as a basic device for voltage conversion and electrical isolation, and is a core device for network connection in a power system. At present, the topology mainly adopted in a direct current transmission system of a power electronic transformer is shown in fig. 1, and the whole topology is composed of N power electronic transformer modules, wherein the low-voltage input sides of the power electronic transformer modules are respectively connected in parallel, and the high-voltage output sides of the power electronic transformers are sequentially connected in series. The input end of the whole topological structure is the low-voltage side of the power electronic transformer and is mainly connected with a low-voltage direct current input source, and the output end of the whole topological structure is the high-voltage side of the power electronic transformer and is connected with a direct current transmission power grid. Each power electronic transformer module is composed of DAB (double active bridge structure) and full bridge module parts. The structure of DAB (double active bridge structure) and full bridge module adopted in the power electronic transformer module can well solve the problem that when the direct current fault occurs on the high-voltage side, fault current is injected into the fault point on the high-voltage direct current side from the high-voltage side of the power electronic transformer. But cannot be blocked for reverse current faults from the high voltage dc side. The fault current is injected into the high-side capacitor from the high-side through the diode in the full-bridge module, so that the capacitor voltage is increased, and meanwhile, the larger fault current can cause damage to the diode device. The prior art cannot solve the problem of recharging current.
Disclosure of Invention
In view of the above problems in the prior art, the present invention proposes a power electronic transformer with a function of blocking bidirectional fault current, which can solve the problem of fault current recharging in addition to the fault point injected from the power electronic transformer side when preventing direct current fault, thereby avoiding the overvoltage and overcurrent problems caused by current recharging and preventing the damage of devices.
The invention adopts the following technical scheme:
the power electronic transformer with the function of blocking bidirectional fault current comprises a power electronic transformer, wherein a recharging current blocking module is connected in series between a high-voltage direct-current side output end of the power electronic transformer and a high-voltage direct-current power transmission grid, namely, an input end of the recharging current blocking module is connected with the high-voltage direct-current side output end of the power electronic transformer, and an output end of the recharging current blocking module is connected with the high-voltage direct-current power transmission grid;
the recharging current blocking module is formed by serially connecting a plurality of switching devices which are reversely connected with a freewheeling diode in parallel, wherein the emitter of a first switching device is connected with the output end of the power electronic transformer, the collector of the first switching device is connected with the emitter of a second switching device, and the following switching devices are serially connected in turn according to the serial connection mode of the first switching device and the second switching device; each series-connected switching device is reversely connected with a freewheeling diode in parallel, the anode of the freewheeling diode is connected with the emitter of the switching device, and the cathode of the freewheeling diode is connected with the collector of the switching device;
the on and off of a switching device in the recharging current blocking module are controlled by detecting the direction and the magnitude of the fault current at the high-voltage direct-current side of the power electronic transformer, so that the fault current is prevented from recharging the power electronic transformer, the power electronic transformer is protected from overvoltage and overcurrent, and the device is prevented from being damaged.
And two ends of a freewheeling diode which is antiparallel to each series switching device in the recharging current blocking module are connected with an energy absorbing element in parallel.
The energy absorbing element is a lightning arrester.
And a switching device in the recharging current blocking module is an IGBT.
The number of the switching devices in the recharging current blocking module is two.
Compared with the prior art, the invention has the following advantages:
the invention controls the on and off of the switching device of the blocking module by adding the recharging current blocking module on the high-voltage direct-current side of the power electronic transformer and detecting the direction and the magnitude of the fault current, thereby turning off the fully-controlled power electronic device when the recharging current is generated, preventing the fault follow current from recharging into the power electronic transformer, protecting the power electronic transformer from overvoltage and overcurrent, and preventing the device from being damaged. Meanwhile, energy absorbing elements such as lightning arresters and the like can be connected in parallel at two ends of a semiconductor device in the blocking unit, on one hand, the follow current energy of locking of the device is absorbed, and on the other hand, the voltage at two ends of the blocking unit can be limited, so that the voltage stress requirement of a blocking module is reduced, the number of switching devices connected in series in a recharging current blocking module can be effectively reduced, and the cost can be reduced. The recharging current blocking module has the function of preventing fault current from flowing from the direct-current fault point to the power electronic transformer side, so that a system added with the blocking module can have the function of bidirectionally blocking the direct-current fault current.
Drawings
Fig. 1 is a topology diagram adopted by a conventional power electronic transformer.
Fig. 2 is a topology of a power electronic transformer with a bi-directional fault current blocking function in accordance with the present invention.
Fig. 3 is a recharging current blocking module without a lightning arrester.
Fig. 4 is a recharge current blocking module for a parallel arrester.
Fig. 5 is a direct current micro grid connection diagram of 4 ends in the embodiment.
Fig. 6 is a schematic diagram of a fault current path at a fault initiation time in an embodiment.
Fig. 7 is a schematic diagram of a fault current path after a converter station is blocked in an embodiment.
Fig. 8 is a schematic diagram of fault current after the 2-port dc breaker of the chicken-hill converter station is opened in the embodiment.
Fig. 9 is a diagram of waveforms of current flowing into the power electronic transformer, port voltage and module capacitance voltage in the embodiment.
Fig. 10 is a topology diagram of a power electronic transformer with a function of blocking bi-directional fault current in an embodiment.
Fig. 11 is a waveform of fault current, port fault voltage and module capacitance voltage of the power electronic transformer according to the embodiment.
Fig. 12 shows the IGBT voltage (kV), the arrester current (kA), and the arrester energy waveform (kJ) after the embodiment is modified.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 2, the power electronic transformer with the function of blocking bidirectional fault current comprises a power electronic transformer, wherein a recharging current blocking module is connected in series between a high-voltage direct-current side output end of the power electronic transformer and a high-voltage direct-current power transmission grid, namely, an input end of the recharging current blocking module is connected with the high-voltage direct-current side output end of the power electronic transformer, and an output end of the recharging current blocking module is connected with the high-voltage direct-current power transmission grid.
As shown in fig. 3, the recharging current blocking module is formed by serially connecting a plurality of switching devices with freewheeling diodes in anti-parallel, wherein the emitter of a first switching device KT1 is connected with the output end of the power electronic transformer, the collector of the first switching device KT1 is connected with the emitter of a second switching device KT2, and the following switching devices are serially connected in turn according to the serial connection mode of the first switching device and the second switching device; each series-connected switching device is reversely connected with a freewheeling diode in parallel, the anode of the freewheeling diode is connected with the emitter of the switching device, and the cathode of the freewheeling diode is connected with the collector of the switching device.
As shown in fig. 4, as a preferred embodiment of the present invention, the energy absorbing element is connected in parallel across the freewheeling diode connected in anti-parallel to each series switching device in the recharging current blocking module. Further, the energy absorbing element is a lightning arrester. Therefore, on one hand, the freewheel energy of device locking can be absorbed, and on the other hand, the voltage at two ends of the switching device can be limited, so that the voltage stress requirement of the recharging current blocking module is reduced, the number of switching devices connected in series in the recharging current blocking module can be effectively reduced, and the cost can be reduced.
Examples
As shown in fig. 5, in a dc micro-grid of a certain 4-terminal, four port converter stations are a chicken-hill converter station 1, a chicken-hill converter station 2, a tangjia bay converter station, and a power electronic transformer terminal, respectively. The four ports are connected by adopting a direct current line. The chicken mountain converter station 1, the Tang-family bay converter station and the chicken mountain converter station 2 are all flexible direct current transmission equipment, an MMC topology is adopted, and the chicken mountain converter station 1 has direct current fault blocking capability by adopting a full-bridge topology. The chicken mountain converter station 2 and the Tang-Jia-Bay converter station adopt a half-bridge topology, and the uneven DC fault blocking capability exists. The direct current circuit is connected with a direct current breaker.
When the chicken mountain convertor station 2 has a direct current bipolar fault, the direct current breaker should act to cut off the fault according to a set fault strategy. The specific fault time sequence is that the time of occurrence of the direct current bipolar fault is 3.95s, the fault detection time is defined as 1ms, after 1ms, the 3.951s chicken mountain convertor station 1 (adopting a full bridge module) and the chicken mountain convertor station 2 (adopting a half bridge module) are locked, and the power electronic transformer is also locked at 3.951 s. 3.952s tangjia bay converter station is blocked. 3.954s, the chicken mountain converter station 2-port direct current breaker is opened.
Fig. 6 shows a schematic diagram of a fault current path at the initial moment of a fault, and when the chicken mountain converter station 2 has a double pole to ground fault, at the initial moment of the fault, four ports inject fault current into the fault point.
As shown in fig. 7, when 3.951s, the chicken-hill converter station 1, the chicken-hill converter station 2 and the power electronic transformer are all locked, the chicken-hill converter station 1 adopts a full bridge topology to cut off the fault current loop, and the power electronic transformer also adopts a fault isolation type structure to cut off the fault current. Since the tangjia bay converter station and the chicken mountain converter station 2 adopt the half-bridge structure, the current loop cannot be cut off before the ac side circuit breaker is opened, and the schematic diagram of the fault current loop is shown in fig. 7.
As shown in fig. 8, when the 3.954s, chicken-hill converter station 2-port dc circuit breaker is opened, a small portion of the energy of the fault current is absorbed by the lightning arresters next to the circuit breaker. In addition, most of the fault current will flow to the power electronic transformer. A schematic diagram of the fault current loop is shown in fig. 8.
As shown in fig. 9, waveforms of fault current flowing into the power electronic transformer, port voltage of the power electronic transformer, and capacitor voltage are shown. It can be seen from the figure that the fault current flowing into the power electronic transformer can reach more than 1.1kA, the rated current of the power electronic transformer is 100A, and the fault current obviously exceeds the device current tolerance capability of the power electronic transformer, so that corresponding measures must be taken to solve the problem.
The scheme of adopting the recharging current blocking module can play a role in preventing the recharging of fault current. However, the device bears higher voltage, and the lightning arresters can be connected in parallel at two ends of the device to limit the over-high voltage, and meanwhile, the voltage equalizing effect is achieved. The specific scheme is shown in fig. 10. And a recharging current blocking module is connected in series to the high-voltage direct-current side of the power electronic transformer, and comprises two series units, wherein each series unit comprises a fully-controlled switching device IGBT, a diode and an energy absorption lightning arrester.
In fig. 10, the recharging current blocking module is formed by connecting two groups of fully-controlled devices IGBT1 and IGBT2 in series, wherein the collector of IGBT1 is connected with the emitter of IGBT2, the emitter of IGBT1 is connected with the output end of the high-voltage direct-current side of the power electronic transformer, and the collector of IGBT2 is connected with the high-voltage direct-current power transmission grid. The full-control device IGBT1 and the IGBT2 are connected in anti-parallel with a freewheeling diode, the anode of the diode is connected with the emitter of the full-control device IGBT, and the cathode of the diode is connected with the collector of the full-control device IGBT. The lightning arrester is connected in parallel with the diode. When the direct-current power grid side has direct-current faults, the switching devices in the full-bridge modules and the full-control devices IGBT1 and IGBT2 in the recharging current blocking modules in all sub-modules in the power electronic transformer are controlled to be disconnected, and the bidirectional flow of fault current is prevented in time, so that the switching devices in the power electronic transformer are protected from being damaged.
After the recharging current blocking module is added, the fault current flowing into the power electronic transformer is obviously inhibited, and the voltage stress can be controlled within the bearing range of the switching device. Meanwhile, after the arrester is added into the recharging current blocking module, fault current and voltage are both within the tolerance range of the switching device, and meanwhile, the voltage at two ends of the blocking device in the recharging current blocking module is limited to a certain extent, and can be limited within 4.5 kV. The absorbed energy of the arrester is about 3kJ, and the maximum current flowing is 400A. Meanwhile, the addition of the lightning arrester can ensure a certain voltage equalizing effect.
As shown in fig. 11, the current flowing through the power electronic transformer, the dc voltage waveform at the power electronic transformer port, and the voltage waveform at the module capacitor are shown. As can be seen from the figure, both the current through the device and the voltage on the capacitor are improved without exceeding the withstand capability of the device.
As shown in fig. 12, the voltage of the IGBT of the recharging current blocking module, the current flowing through the arrester, and the energy waveform of the arrester. The voltage of the IGBT is within the bearing range of the device, and meanwhile, the IGBT has a good voltage equalizing effect. The energy waveform of the lightning arrester can guide the type selection of the lightning arrester.
Claims (5)
1. A power electronic transformer with a function of blocking bidirectional fault current, comprising a power electronic transformer, characterized in that: a recharging current blocking module is connected in series between the high-voltage direct-current side output end of the power electronic transformer and the high-voltage direct-current power transmission grid, namely, the input end of the recharging current blocking module is connected with the high-voltage direct-current side output end of the power electronic transformer, and the output end is connected with the high-voltage direct-current power transmission grid;
the recharging current blocking module is formed by serially connecting a plurality of switching devices which are reversely connected with a freewheeling diode in parallel, wherein the emitter of a first switching device is connected with the output end of the power electronic transformer, the collector of the first switching device is connected with the emitter of a second switching device, and the following switching devices are serially connected in turn according to the serial connection mode of the first switching device and the second switching device; each series-connected switching device is reversely connected with a freewheeling diode in parallel, the anode of the freewheeling diode is connected with the emitter of the switching device, and the cathode of the freewheeling diode is connected with the collector of the switching device;
the on and off of a switching device in the recharging current blocking module are controlled by detecting the direction and the magnitude of the fault current at the high-voltage direct-current side of the power electronic transformer, so that the fault current is prevented from recharging the power electronic transformer, the power electronic transformer is protected from overvoltage and overcurrent, and the device is prevented from being damaged.
2. A power electronic transformer with a function of blocking a bi-directional fault current according to claim 1, characterized in that: and two ends of a freewheeling diode which is antiparallel to each series switching device in the recharging current blocking module are connected with an energy absorbing element in parallel.
3. A power electronic transformer with a function of blocking a bidirectional fault current as recited in claim 2, wherein: the energy absorbing element is a lightning arrester.
4. A power electronic transformer with a function of blocking a bi-directional fault current according to claim 1, characterized in that: and a switching device in the recharging current blocking module is an IGBT.
5. A power electronic transformer with a function of blocking a bi-directional fault current according to claim 1, characterized in that: the number of the switching devices in the recharging current blocking module is two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810589631.XA CN108512432B (en) | 2018-06-08 | 2018-06-08 | Power electronic transformer with function of blocking bidirectional fault current |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810589631.XA CN108512432B (en) | 2018-06-08 | 2018-06-08 | Power electronic transformer with function of blocking bidirectional fault current |
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| CN108512432A CN108512432A (en) | 2018-09-07 |
| CN108512432B true CN108512432B (en) | 2024-02-27 |
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| CN201810589631.XA Active CN108512432B (en) | 2018-06-08 | 2018-06-08 | Power electronic transformer with function of blocking bidirectional fault current |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109494690B (en) * | 2018-10-10 | 2020-01-10 | 特变电工新疆新能源股份有限公司 | Fault protection strategy for direct-current micro-grid circuit |
| CN111146951B (en) * | 2020-01-20 | 2021-08-17 | 特变电工西安电气科技有限公司 | Power electronic transformer capable of being started in two directions and control method thereof |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105515353B (en) * | 2016-01-27 | 2018-06-19 | 东南大学 | The four port electric power electric transformers based on mixed type module multi-level converter |
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2018
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| CN1852021A (en) * | 2006-05-26 | 2006-10-25 | 南京航空航天大学 | L-source inventer |
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| CN108512432A (en) | 2018-09-07 |
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