CN105162157B - A kind of Voltage to current transducer switch based on three-phase H bridge - Google Patents
A kind of Voltage to current transducer switch based on three-phase H bridge Download PDFInfo
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- CN105162157B CN105162157B CN201510589276.2A CN201510589276A CN105162157B CN 105162157 B CN105162157 B CN 105162157B CN 201510589276 A CN201510589276 A CN 201510589276A CN 105162157 B CN105162157 B CN 105162157B
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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
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- 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 present invention provides a kind of, and the Voltage to current transducer based on three-phase H bridge switchs, including sending end three-phase inverter and receiving end three-phase inverter；The upper bridge arm of every phase and the tie point of lower bridge arm in the upper bridge arm of every phase and the tie point of lower bridge arm and receiving end three-phase inverter in sending end three-phase inverter, are connected by ac cable；Ac cable includes the first pole ac cable, the second pole ac cable and third pole ac cable.Compared with prior art, a kind of Voltage to current transducer switch based on three-phase H bridge provided by the invention, when reducing the overturning of three polar conductor polarity of voltages, the rate of change of DC current, while also reducing the electric current that electrode current change-over switch needs to disconnect.
Description
Technical field
The present invention relates to technical field of electric power transmission, and in particular to a kind of Voltage to current transducer switch based on three-phase H bridge.
Background technique
In recent years, Urbanization Progress speed is further speeded up, and electricity need load constantly increases, and objectively requires power grid scale
Sustainable development is kept with transmission capacity, however the generally existing following problems of urban distribution network at present.
Electricity need load increases, and alternating current circuit conveying capacity is insufficient, and line corridor is deficient.For the AC line of heavy duty
Road can not greatly improve conveying capacity by installing FACTS device additional, and the resistance that new route encounters is increasing, especially
The line project gone down town is difficult to be supported in terms of expropriation of land, environmental protection.Urban distribution network structure is increasingly close, short circuit current problem
It is prominent.
Urban distribution network development speed is very fast, and power network line is interweaved, and tightness degree is higher, and equivalent impedance is smaller, causes
The short circuit current level of power grid is higher.Such as solve the problems, such as that urban distribution network power supply capacity is insufficient using newly-built alternating current circuit, it will
It is further close to will cause power grid, equivalent impedance further decreases, and so as to cause short circuit current increase, influences power grid security fortune
Row.
Urban distribution network reactive voltage adjusts difficulty, voltage stability problem increasingly and can not be ignored.Cable in urban distribution network
Road is increasing, and urban district substation is limited by land used, and inductive reactive power configuration is universal insufficient, and reactive voltage adjusts difficulty increasingly, especially
It is the power grid low ebb load period, and the higher situation of voltage is serious.In addition, air conditioner load, induction-motor load specific gravity in urban distribution network
Larger, since quick dynamic reactive adjustment capability is insufficient, peak load of grid period Dynamic voltage stability problem is gradually protruded.
In view of the above problems, it is necessary to study new technological means, the defeated transmission of electricity in existing line corridor should be given full play to
Potentiality prevent the problems such as short circuit current is exceeded and dynamic reactive underbraced again.
In terms of transmission line of electricity, the principal element for restricting alternating current circuit transmission capacity is insulation tolerance.Currently,
The insulation of AC system is designed according to voltage peak, but transmission capacity is determined by voltage effective value, only the 71% of peak value.
Studies have shown that alternating current circuit is run under direct current mode, due to the difference of field distribution, heat condition etc. in insulating layer
Different, the D.C. isolation intensity of alternating current circuit is almost 2~3 times or bigger of alternating voltage.In addition, for cable run, due to
Its capacitor is more much bigger than overhead transmission line, if using ac transmission mode and when cable length is more than certain numerical value (such as 40
~60km) when, it just will appear the case where capacitance current occupies cable core whole payload capability, and use direct current transportation side
Formula, stable state capacitance current are caused by ripple voltage, numerical value very little, therefore the power transmission length of cable is hardly by capacitance current
Limitation.
To sum up, it is desirable to provide a kind of scheme that three-phase AC line is transform as to flexible DC transmission, in particular for mentioning
For a kind of voltage across poles rheotrope, reduce the current value for needing to disconnect in its handoff procedure.
Summary of the invention
In order to meet the needs of the prior art, the present invention provides a kind of, and the Voltage to current transducer based on three-phase H bridge is switched.
The technical scheme is that
The switch includes sending end three-phase inverter and receiving end three-phase inverter；The sending end three-phase inverter accesses sending end
AC system, the receiving end three-phase inverter access receiving end AC system；
The upper bridge arm of every phase and the tie point of lower bridge arm and the receiving end three-phase change of current in the sending end three-phase inverter
The upper bridge arm of every phase and the tie point of lower bridge arm, are connected by ac cable in device；
The ac cable includes the first pole ac cable, the second pole ac cable and third pole ac cable.
Preferably, the sending end three-phase inverter and receiving end three-phase inverter are H bridge multilevel converter；
The upper bridge arm and lower bridge arm of the H bridge multilevel converter include N number of concatenated H bridge power modules, and N is at least
It is 2；The upper bridge arm is connected with lower bridge arm by conducting wire；
Preferably, the H bridge power modules include the first bridge arm, capacitor and the second bridge arm successively in parallel；
First bridge arm includes two concatenated wholly-controled devices, and the second bridge arm also includes two concatenated full-control type devices
Part；
Preferably, the both ends of a wholly-controled device diode in parallel；
The anode of the diode and the emitter of wholly-controled device connect, the cathode of diode and the collection of wholly-controled device
Electrode connection；
Preferably, by adjusting being switched on or off of the upper bridge arm of every phase, lower bridge arm in the sending end three-phase inverter
Be switched on or off and the receiving end three-phase inverter in being switched on or off of upper bridge arm of every phase, lower bridge arm lead
Logical or disconnection, so that periodically-varied flows through the voltage direction and current direction of the ac cable；
Preferably, the input terminal of the sending end three-phase inverter accesses the same bus of the sending end AC system
In or the input terminal be respectively connected in the different buses of sending end AC system；
The output end of the receiving end three-phase inverter accesses in the same bus of the receiving end AC system, Huo Zhesuo
Output end is stated to be respectively connected in the different buses of receiving end AC system.
Compared with the immediate prior art, the excellent effect of the present invention is that:
1, a kind of Voltage to current transducer switch based on three-phase H bridge provided by the invention, by three-phase H bridge voltage electric current
The periodicity of three pole cable run voltage directions and current direction can be realized in the control of the upper and lower bridge arm of the every phase bridge of change-over switch
Change；
2, a kind of Voltage to current transducer switch of three-phase H bridge provided by the invention, the increase-volume for ac cable route change
The problem of making technology, largely reduced the accumulation of cable run Space-charge, ensure that the insulation performance of cable run after transformation；
3, a kind of three-phase H bridge voltage rheotrope provided by the invention abundant, balanced can utilize three-phase alternating current
The through-current capability on cable road, and the sum of three-phase current is zero at any time, will not generate the zero sequence circulation for flowing through the earth；
4, provided by the invention a kind of based on three-phase H bridge voltage rheotrope, using H bridge concatenation technology, the technology
Maturity is high, and scalability is strong, and popularization and application foreground is good；
5, Voltage to current transducer switch provided by the invention, is applied to three-phase alternating current cable road transmission system and is transformed,
While not increasing grid short circuit level, it is obviously improved the flexibility and reliability of system operation.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1: the Voltage to current transducer switch structure diagram based on three-phase H bridge is used in the embodiment of the present invention；
Fig. 2: H bridge sub-modular structure schematic diagram in the embodiment of the present invention；
Fig. 3: the first pole ac cable electric current and voltage oscillogram in the embodiment of the present invention；
Fig. 4: the second pole ac cable electric current and voltage oscillogram in the embodiment of the present invention；
Fig. 5: third pole ac cable electric current and voltage oscillogram in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
A kind of rheotrope based on three-phase H bridge provided by the invention is suitable for novel compact transmission system, benefit
With the charge and discharge of capacitor, cooperate voltage across poles current-modulation strategy, prevents electric current during voltage across poles curent change prominent
Change is of great significance.
A kind of embodiment of Voltage to current transducer switch based on three-phase H bridge provided by the invention is as shown in Figure 1, main packet
Include sending end three-phase inverter and receiving end three-phase inverter, wherein
Sending end three-phase inverter accesses sending end AC system, and receiving end three-phase inverter accesses receiving end AC system.
Every phase in the upper bridge arm of every phase and the tie point of lower bridge arm and receiving end three-phase inverter in sending end three-phase inverter
Upper bridge arm and lower bridge arm tie point, connected by ac cable；
In the present embodiment, ac cable includes the first pole ac cable, the second pole ac cable and third pole ac cable.
1, sending end three-phase inverter
Sending end three-phase inverter is the inverter of the more level of H bridge；The upper bridge arm and lower bridge arm of the inverter of the more level of H bridge
It include N number of concatenated H bridge submodule, N is at least 2；Upper bridge arm is connected with lower bridge arm by conducting wire.
Sending end three-phase inverter includes three single-phase cascade change of current bridge arms of H bridge, each change of current bridge arm packet in the present embodiment
The H bridge submodule number included depends on the capacity and voltage class of transmission system
2, receiving end three-phase inverter
Receiving end three-phase inverter is also H bridge multilevel converter；The upper bridge arm and lower bridge arm of the H bridge multilevel converter
It include N number of concatenated H bridge submodule, N is at least 2；Upper bridge arm is connected with lower bridge arm also by conducting wire.
Receiving end three-phase inverter is made of three single-phase cascade change of current bridge arms of H bridge in the present embodiment, each change of current bridge arm
Including H bridge submodule number also depend on the capacity and voltage class of transmission system.
The present embodiment is red, by adjusting being switched on or off of the upper bridge arm of every phase, lower bridge in sending end three-phase inverter
Arm be switched on or off and receiving end three-phase inverter in being switched on or off of upper bridge arm of every phase, the conducting of lower bridge arm
Or disconnect, so that periodically-varied flows through the voltage direction and current direction of ac cable.
The input terminal of sending end three-phase inverter accesses in the same bus of sending end AC system or input terminal difference
It accesses in the different buses of sending end AC system；The output end of receiving end three-phase inverter accesses the same of receiving end AC system
In bus or output end is respectively connected in the different buses of receiving end AC system.
3, H bridge submodule
As shown in Fig. 2, in the present embodiment H bridge submodule specific structure are as follows:
H bridge submodule includes the first bridge arm successively in parallel, capacitor UcWith the second bridge arm.
First bridge arm includes two concatenated wholly-controled device VT1With wholly-controled device VT2；Second bridge arm also includes two
Concatenated wholly-controled device VT3With wholly-controled device VT4；Wholly-controled device both ends are parallel with a diode, the sun of diode
The connection of the emitter of pole and wholly-controled device, the cathode of diode and the collector of wholly-controled device connect.
4, the specific connection type of sending end three-phase inverter and receiving end three-phase inverter are as follows:
As shown in Figure 1, a phase of sending end three-phase inverter is connect by the first pole ac cable with receiving end three-phase inverter,
One phase is connect by the second pole ac cable with receiving end three-phase inverter, and a phase is changed by third pole ac cable and receiving end three-phase
Flow device connection.Wherein, L1 is the line impedance of the first pole ac cable, and L2 is the line impedance of the second pole ac cable, and L3 is
The line impedance of third pole ac cable.
In transmission system direction of tide, master-slave relationship be can be interchanged in the present embodiment, i.e., transmission system can be realized positive and negative
The electrical energy transportation of both direction.Meanwhile the tide between the first pole ac cable, the second pole ac cable and third pole ac cable
Stream flowing, not constitutes access greatly, the retrial of metal equipment in high-frequency electromagnetic interference and the earth is avoided, using voltage and current
The problem of route voltage and current weakens its space charge accumulation in change-over switch control ac cable.
5, the control process of Voltage to current transducer switch provided by the invention are as follows:
Pass through the line voltage distribution polarity and sense of current of three-pole AC cable shown in periodically-varied Fig. 1, Neng Gou
Fever limitation increases the transmission power of original transmission system under the same conditions, while by periodically changing three-pole AC electricity
The line voltage distribution polarity of cable, can also cut down the space charge accumulation of cable run.First pole ac cable, the second pole alternating current
The line electricity flow valuve of cable and third pole ac cable is in ImaxAnd IminBetween cyclically-varying, direction with ac cable route
The variation of polarity of voltage and change.
Due in the first pole ac cable, the second pole ac cable and third pole ac cable when wantonly two cable parallel connections,
Its DC current is Imin, therefore series shunt resistance is not needed to realize the adjusting of electric current, substantially reduce transmission system
Loss.As in Figure 3-5 when the first pole ac cable route and third pole ac cable lines in parallel, voltage is-UDC, jointly
Flowing through reverse current is-IminWhen, the second pole ac cable line operating voltages are+UDC, it is I by forward currentmax；
1.: t1From moment, make the first pole ac cable line voltage distribution polarity invert, at this time the first pole ac cable route with
Second pole ac cable lines in parallel, voltage are+UDC, flowing through forward current jointly is Imin, third pole ac cable route pole
Property remain unchanged, voltage be-UDC, flowing through reverse current is-Imax。
2.: t2From moment, make the second pole ac cable line voltage distribution polarity invert, at this time the second pole ac cable route with
Third pole ac cable lines in parallel, voltage are-UDC, flowing through reverse current jointly is-Imin, the first pole ac cable route pole
Property remain unchanged, voltage be+UDC, flowing through forward current is+Imax。
3.: t3From moment, make third pole ac cable line polarity reversal, at this time third pole ac cable route and first
Grade ac cable lines in parallel, voltage are+UDC, forward current+I is flowed through jointlymin, the holding of the second pole ac cable route memory
Constant, voltage is-UDC, flowing through reverse current is-Imax。
4.: t4From moment, make first order ac cable line polarity reversal, at this time first order ac cable route and second
Pole ac cable lines in parallel, voltage are-UDC, flowing through reverse current jointly is-Imin, third pole ac cable line polarity guarantor
Hold it is constant, voltage be+UDC, flowing through forward current is+Imax。
5.: t5From moment, make the second pole ac cable line polarity reversal, at this time the second pole ac cable route and third
Pole ac cable lines in parallel, voltage are+UDC, forward current+I is flowed through jointlymin, the second pole cable run polarity remains unchanged,
Voltage is-UDC, flowing through reverse current is-Imax。
6.: t6From moment, make third pole ac cable line polarity reversal, at this time the first pole ac cable route and third
Pole ac cable lines in parallel, voltage are-UDC, reverse current-I is flowed through jointlymin, the second pole cable run polarity remains unchanged,
Voltage is+UDC, flowing through forward current is+Imax, with this regular cyclically-varying.
A kind of Voltage to current transducer switch based on three-phase H bridge provided by the invention, can be periodically changed three-pole AC
Polarity of voltage, the current direction of cable run.Meanwhile the present invention uses the cascade more level serial connection technologies of H bridge, it is big without configuration
Capacity reactive compensation and filter apparatus, while not increasing system short-circuit levels of current, moreover it is possible to provide dynamic for AC system
Voltage support and active power filtering function, are remarkably improved system operational flexibility and reliability.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (4)
1. a kind of Voltage to current transducer switch based on three-phase H bridge, which is characterized in that the switch includes sending end three-phase inverter
With receiving end three-phase inverter；The sending end three-phase inverter accesses sending end AC system, the receiving end three-phase inverter access by
Hold AC system；
In the sending end three-phase inverter in the upper bridge arm of every phase and the tie point of lower bridge arm and the receiving end three-phase inverter
The upper bridge arm of every phase and the tie point of lower bridge arm, are connected by ac cable；
The ac cable includes the first pole ac cable, the second pole ac cable and third pole ac cable；
The sending end three-phase inverter and receiving end three-phase inverter are H bridge multilevel converter；
The upper bridge arm and lower bridge arm of the H bridge multilevel converter include N number of concatenated H bridge power modules, and N is at least 2；
The upper bridge arm is connected with lower bridge arm by conducting wire；
By adjusting being switched on or off of the upper bridge arm of every phase in the sending end three-phase inverter, the conducting of lower bridge arm or disconnected
Open and the receiving end three-phase inverter in being switched on or off of upper bridge arm of every phase, lower bridge arm be switched on or off, from
And periodically-varied flows through the voltage direction and current direction of the ac cable.
2. a kind of Voltage to current transducer switch based on three-phase H bridge as described in claim 1, which is characterized in that the H bridge function
Rate submodule includes the first bridge arm, capacitor and the second bridge arm successively in parallel；
First bridge arm includes two concatenated wholly-controled devices, and the second bridge arm also includes two concatenated wholly-controled devices.
3. a kind of Voltage to current transducer switch based on three-phase H bridge as claimed in claim 2, which is characterized in that the full control
The both ends of a type device diode in parallel；
The anode of the diode and the emitter of wholly-controled device connect, the cathode of diode and the collector of wholly-controled device
Connection.
4. a kind of Voltage to current transducer switch based on three-phase H bridge as described in claim 1, which is characterized in that the sending end
The input terminal of three-phase inverter accesses in the same bus of the sending end AC system or the input terminal is respectively connected to
In the different buses of sending end AC system；
The output end of the receiving end three-phase inverter accesses in the same bus of the receiving end AC system or described defeated
Outlet is respectively connected in the different buses of receiving end AC system.
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| CN201510589276.2A CN105162157B (en) | 2015-09-15 | 2015-09-15 | A kind of Voltage to current transducer switch based on three-phase H bridge |
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| CN105162157B true CN105162157B (en) | 2019-02-05 |
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| CN112271116B (en) * | 2020-09-14 | 2023-01-20 | 中国科学院电工研究所 | Double-line blocking integrated circuit breaker and control method thereof |
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| CN204928187U (en) * | 2015-09-15 | 2015-12-30 | 国网辽宁省电力有限公司经济技术研究院 | Voltage -current conversion switch based on three -phase H bridge |
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2015
- 2015-09-15 CN CN201510589276.2A patent/CN105162157B/en active Active
Patent Citations (7)
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| KR101425400B1 (en) * | 2013-08-29 | 2014-08-13 | 한국전력공사 | Power converter for high voltage direct current transmission |
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