CN105048825B - Super high power cascaded high-voltage frequency converter and its method for inhibiting surge - Google Patents
Super high power cascaded high-voltage frequency converter and its method for inhibiting surge Download PDFInfo
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- CN105048825B CN105048825B CN201510613958.2A CN201510613958A CN105048825B CN 105048825 B CN105048825 B CN 105048825B CN 201510613958 A CN201510613958 A CN 201510613958A CN 105048825 B CN105048825 B CN 105048825B
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Abstract
The invention discloses a kind of methods of super high power cascaded high-voltage frequency converter and its inhibition surge, are related to high-pressure frequency-conversion field.The cascaded high-voltage frequency converter includes two or more phase-shifting transformer groups, 24 power cell A1~A8, B1~B8, C1~C8, high pressure 10kV power supply, low pressure 380V power supply, excitation surge restraint circuit, high pressure 10kV power supply is connected by excitation surge restraint circuit with phase-shifting transformer primary side winding, phase-shifting transformer vice-side winding is connected with 24 power cell A1~A8, B1~B8, C1~C8, and phase-shifting transformer is provided with low pressure auxiliary winding；Excitation surge restraint circuit includes the first vacuum circuit breaker QF1, the second vacuum circuit breaker QF2, current-limiting resistance R0.The present invention can effectively inhibit excitation surge, improve the reliability and stability of product, reduce cost, reduce the production difficulty of phase-shifting transformer, facilitate later period carrying and installation.
Description
Technical field
The present invention relates to high-pressure frequency-conversion field, it is specifically related to a kind of super high power cascaded high-voltage frequency converter and its inhibition
The method of surge.
Background technique
The industrialized fast development in China promotes motor manufacture and develops with application to high-power direction.Super large function
Rate cascaded high-voltage frequency converter has obtained widely answering to drag high-voltage high-power motor, in metallurgy, petrochemical industry, chemical industry
With.20 megawatts or more are generally concentrated in super high power application, such as blast furnace in metallurgical industry power of fan, often uses two
Or more high-voltage frequency converter parallel connections are dragged, it is shown in Figure 1, and the technical difficulty of machine is larger, more high-voltage frequency converters are same
Shi Yunhang, wherein when any one failure, entire combining system will running overload or shutdown, seriously affect system
Reliability and stability.
The core of super high power cascaded high-voltage frequency converter is made of Multiple coil phase-shifting transformer and multiple groups power cell.Greatly
Power phase-shifting transformer powered on moment, excitation surge are very big.At the same time, power cell internal has a large amount of capacitor groups as whole
The Support Capacitor of link is flowed, these capacitors are equivalent to short circuit in charging transient, and charging surge is very big.Super high power cascaded high-voltage
If the excitation surge and charging surge of frequency converter powered on moment are not inhibited, higher level's switch trip is easily caused, is influenced same
The normal operation of net other equipment.
Shown in Figure 2, charge caused by power cell capacitor powered on moment surge in order to prevent, traditional way be
Serial connection charge resistance R4 between power cell internal DC bus and capacitor C1~C3, charging resistor R4 both ends and connect charging
Contactor K1.In power cell powered on moment, charged by charging resistor R4 to capacitance group C1-C3.
When capacitance voltage reaches certain voltage value, it is closed charging contactor K1, is shorted charging resistor R4.The method is each
Power cell internal all needs installation charging resistor and charging contactor and corresponding control circuit, not only increases cost, also
Complex process degree is increased, and reduces the reliability of product.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned background technique, a kind of super high power cascaded high-voltage change is provided
Frequency device and its method for inhibiting surge, can effectively inhibit excitation surge, improve the reliability and stability of product, can reduce into
This, is effectively reduced the production difficulty of phase-shifting transformer, facilitates later period carrying and installation.
The present invention provides a kind of super high power cascaded high-voltage frequency converter, including two or more phase-shifting transformer groups, 24
A power cell A1~A8, B1~B8, C1~C8, high pressure 10kV power supply, low pressure 380V power supply, excitation surge restraint circuit, institute
It states high pressure 10kV power supply to be connected by excitation surge restraint circuit with phase-shifting transformer primary side winding, phase-shifting transformer vice-side winding
It is connected with 24 power cell A1~A8, B1~B8, C1~C8, phase-shifting transformer is provided with low pressure auxiliary winding；The excitation
Surge restraint circuit includes the first vacuum circuit breaker QF1, the second vacuum circuit breaker QF2, charging resistor R0, the first vacuum circuit breaker
One end of QF1 is connected with high pressure 10kV power supply, and the other end is connected with one end of charging resistor R0, the other end of charging resistor R0 with
The input terminal of frequency converter is connected, and the second vacuum circuit breaker QF2 is connected in parallel on the both ends of charging resistor R0, each phase-shifting transformer pair side around
Group differential seat angle is 60 °/N, and N is phase-shifting transformer vice-side winding quantity.
Based on the above technical solution, each power cell includes 6 rectifier diode D1~D6,3 capacitor C1
~C3,3 equalizing resistance R1~R3,4 insulated gate bipolar transistor T1~T4,2 AC output terminal CL1~CL2, power
Unit ABC three-phase input end takes electricity from phase-shifting transformer vice-side winding, after the rectifier bridge rectification being made of D1~D6, by capacitor C1
~C3 filters energy storage, and it is exchange side by DC bus-bar voltage inversion that control T1~T4 is sequentially turned on by SPWM sinusoidal pulse width modulation
Wave voltage is exported by CL1, CL2 ac output end.
Based on the above technical solution, the high-voltage frequency converter further includes charging surge restraint circuit, low pressure 380V
Power supply is connected by the surge restraint circuit that charges with auxiliary winding.
Based on the above technical solution, in the moment that power cell powers on short circuit occurs for the capacitor C1~C3, leads to
Overcharge surge restraint circuit inhibits charging surge current.
Based on the above technical solution, the charging surge restraint circuit includes the first air-break circuit-breaker Q1, first
Charging contactor KM1, the charging resistor R5~R7 being connected in three-phase line respectively, the second air-break circuit-breaker Q2, the second charging
Contactor KM2, the charging resistor R8~R10 being connected in three-phase line respectively, third air-break circuit-breaker Q3, the first phase shift transformation
Device T1 auxiliary winding and the second phase-shifting transformer T2 auxiliary winding, the input terminal and low pressure 380V power supply of the first air-break circuit-breaker Q1
It is connected, the output end of the first air-break circuit-breaker Q1 is connect with the input terminal of the first charging contactor KM1, the first charging contactor
The output of KM1 is divided into two branches：First branch and the resistance R5~R7, the second air that are connected in three-phase line respectively are disconnected
Road device Q2 series connection, the output end of the second air-break circuit-breaker Q2 are connected with the auxiliary winding of the first phase-shifting transformer T1；Article 2 branch
Resistance R8~R10, the third air-break circuit-breaker Q3 that road is connected in three-phase line with the second charging contactor KM2, respectively connect,
The output end of third air-break circuit-breaker Q3 is connected with the auxiliary winding of the second phase-shifting transformer T2.
Based on the above technical solution, the charging resistor R0, charging resistor R5~R7, R8~R10 are power
Ripple resistance, surface coat high fire-retardance inorganic coating.
Based on the above technical solution, the phase-shifting transformer vice-side winding is realized more by extend-triangle technology
Change rectification again.
Based on the above technical solution, when N=8, for the phase-shifting transformer of secondary 8 winding of side, phase shift angle difference is
7.5°；Each phase-shifting transformer be provided with 1 primary side winding, 4 secondary side Phase shift windings, 1 with primary side with phase low pressure auxiliary around
Group, for 4 Phase shift windings of T1 with respect to primary side winding, phase shift angle is respectively 26.25 °, 18.75 °, 11.25 °, 3.75 °, phase shift
Angle is that 26.25 ° of winding is connect with the input terminal of power cell A1, power cell B1, power cell C1 respectively, phase shift angle
It is connect respectively with the input terminal of power cell A2, power cell B2, power cell C2 for 18.75 ° of windings, phase shift angle is
11.25 ° of winding is connect with the input terminal of power cell A3, power cell B3, power cell C3 respectively, and phase shift angle is
3.75 ° of winding is connect with the input terminal of power cell A4, power cell B4, power cell C4 respectively；4 Phase shift windings of T2
Opposite primary side winding, phase shift angle are respectively -3.75 °, -11.25 °, -18.75 °, -26.25 °, and phase shift angle is -3.75 °
Winding is connect with the input terminal of power cell A5, power cell B5, power cell C5 respectively, phase shift angle be -11.25 ° around
Group is connect with the input terminal of power cell A6, power cell B6, power cell C6 respectively, the winding that phase shift angle is -18.75 °
It is connect respectively with the input terminal of power cell A7, power cell B7, power cell C7, phase shift angle is -26.25 ° around component
It is not connect with the input terminal of power cell A8, power cell B8, power cell C8.
Based on the above technical solution, the output of the high-voltage frequency converter is sequentially connected in series group by the output of power cell
At：Power cell A1-A8 is composed in series that high-voltage frequency converter A phase exports, power cell B1-B8 is composed in series high-voltage frequency converter B phase
Output, power cell C1-C8 are composed in series high-voltage frequency converter C phase and export.
Based on the above technical solution, the primary side winding of T1, T2 are in parallel, it is in parallel after with excitation surge restraint circuit phase
Connection；The low pressure auxiliary winding of T1, T2 are connected with charging surge restraint circuit respectively.
The method for inhibiting surge based on above-mentioned super high power cascaded high-voltage frequency converter that the present invention also provides a kind of, including
Following steps：
S1, power cell precharge operation, the first air-break circuit-breaker Q1 of closure, the second sky are carried out to high-voltage frequency converter first
Gas circuit breaker Q 2, third air-break circuit-breaker Q3 access the auxiliary winding of low pressure 380V power supply and T1, T2；Complete machine control unit hair
Precharge command out, closure the second charging contactor KM2, the first charging contactor KM1 are then closed, and auxiliary winding is powered, and moves
Phase winding generates induced voltage, and power cell slowly gives capacitor charging by charging resistor R5~R7, R8~R10；First charging
After the control coil of contactor KM1 takes the normally opened contact of the second charging contactor KM2, the second charging contactor KM2 to be closed, first
Charging contactor KM1 can be just closed；
S2, when capacitance voltage reach preset voltage value when, power cell internal control power supply work once electrified, opened by optical fiber
Begin to send information to upper layer complete machine control unit, when top level control unit detects that capacitance voltage rises to rated operational voltage
When preset ratio, issuing precharge terminates order, and the second charging contactor KM2 is disconnected, and subsequent first charging contactor KM1 is disconnected
It opens；
S3, after the completion of confirming precharge operation, the first charging contactor KM1, the second charging contactor KM2 be in disconnect
State, closed high inlet wire the first vacuum circuit breaker QF1, T1 and T2 primary side winding access high voltage power supply by charging resistor R0,
Phase-shifting transformer primary side excitation surge is effectively suppressed；
After S4, the first vacuum circuit breaker QF1 are closed a period of time, the second vacuum circuit breaker QF2 closure, charging resistor R0 quilt
It is shorted.
Based on the above technical solution, in step S2, the preset voltage value is 400V.
Based on the above technical solution, in step S2, the preset ratio is 80%.
Based on the above technical solution, in step S4, the time of the first vacuum circuit breaker QF1 closure is 2 seconds.
Compared with prior art, advantages of the present invention is as follows：
(1) in the prior art, multi-machine parallel connection scheme is generally used under high-power applications occasion, inverter parallel output is logical
It often all connects reactor to be flowed, plays loop current suppression.Compared with the multi-machine parallel connection scheme under high-power applications occasion, this
Super high power cascaded high-voltage frequency converter in invention directly connects user's motor, and output is not necessarily to equalizing reactor, the suppression of excitation surge
Circuit processed can effectively inhibit excitation surge, improve the reliability and stability of product.
(2) it is provided with charging surge restraint circuit in the present invention, can effectively inhibits the surge that charges, improves the reliability of product
And stability.
(3) compared in each power cell internal increase power resistor, contactor and corresponding control circuit, the present invention
Charging resistor R4 and charging contactor K1 are eliminated in each power cell internal, by the shifting of traditional cascaded high-voltage frequency converter
Phase transformer is decomposed into two or more phase-shifting transformers, and phase-shifting transformer pair side Phase shift winding is corresponding to be reduced.In super high power
Application, separate unit phase-shifting transformer can significantly reduce cost, cost performance is high, economic benefit since capacity and winding are reduced
Obviously；The production difficulty that phase-shifting transformer can also be reduced facilitates later period carrying and installation, improves the reliability and stabilization of product
Property.
Detailed description of the invention
Fig. 1 is the circuit diagram of high-pressure frequency-conversion parallel arrangement under existing high-power applications occasion.
Fig. 2 is the circuit diagram of existing charging Surge suppression power cell.
Fig. 3 is the circuit diagram of super high power cascaded high-voltage frequency converter in the embodiment of the present invention.
Fig. 4 is the circuit diagram of single power cell in the embodiment of the present invention.
Fig. 5 is the circuit diagram of excitation surge restraint circuit in the embodiment of the present invention.
Fig. 6 is the circuit diagram of charging surge restraint circuit in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Shown in Figure 3, the embodiment of the present invention provides a kind of super high power cascaded high-voltage frequency converter, including two or more
A phase-shifting transformer group, B1~B8, C1~C8, high pressure 10kV power supply, low pressure 380V power supply, is filled 24 power cell A1~A8
Electric surge restraint circuit, excitation surge restraint circuit.High pressure 10kV power supply passes through excitation surge restraint circuit and phase-shifting transformer
Primary side winding is connected, and phase-shifting transformer vice-side winding is connected with 24 power cell A1~A8, B1~B8, C1~C8, and phase shift becomes
Depressor is provided with low pressure auxiliary winding, and low pressure 380V power supply is connected by the surge restraint circuit that charges with auxiliary winding.
Shown in Figure 4, each power cell is pressed including 6 rectifier diode D1~D6,3 capacitor C1~C3,3
Resistance R1~R3,4 insulated gate bipolar transistor T1~T4,2 AC output terminal CL1~CL2, power cell ABC three-phase
Input terminal takes electricity from phase-shifting transformer vice-side winding, after the rectifier bridge rectification being made of D1~D6, by capacitor C1~C3 filter bank
Can, control T1~T4 sequentially turned on by SPWM sinusoidal pulse width modulation, by DC bus-bar voltage inversion be ac square-wave voltage by
The output of CL1, CL2 ac output end.In the moment that power cell powers on short circuit occurs for capacitor C1~C3, passes through the Surge suppression that charges
Circuit inhibits charging surge current, reduces the impact to rectifier bridge and capacitance group.
It is shown in Figure 5, excitation surge restraint circuit include the first vacuum circuit breaker QF1, the second vacuum circuit breaker QF2,
One end of charging resistor R0, the first vacuum circuit breaker QF1 are connected with high pressure 10kV power supply, one end of the other end and charging resistor R0
It is connected, the other end of charging resistor R0 is connected with the input terminal of frequency converter, and the second vacuum circuit breaker QF2 is connected in parallel on charging resistor R0
Both ends.
Shown in Figure 6, charging surge restraint circuit includes the first air-break circuit-breaker Q1, the first charging contactor KM1, divides
Charging resistor R5~R7 for not being connected in three-phase line, it the second air-break circuit-breaker Q2, the second charging contactor KM2, goes here and there respectively
Charging resistor R8~R10, the third air-break circuit-breaker Q3, the first phase-shifting transformer T1 auxiliary winding and being associated in three-phase line
The input terminal of two phase-shifting transformer T2 auxiliary windings, the first air-break circuit-breaker Q1 is connected with low pressure 380V power supply, the first air
The output end of circuit breaker Q 1 is connect with the input terminal of the first charging contactor KM1, and the output of the first charging contactor KM1 is divided into two
Branch：First branch is connected with the resistance R5~R7 being connected in three-phase line respectively, the second air-break circuit-breaker Q2, and second
The output end of air-break circuit-breaker Q2 is connected with the auxiliary winding of the first phase-shifting transformer T1；Article 2 branch and the second charge contact
Device KM2, the resistance R8~R10 being connected in three-phase line respectively, third air-break circuit-breaker Q3 series connection, third air-break circuit-breaker Q3
Output end be connected with the auxiliary winding of the second phase-shifting transformer T2.
Charging resistor R0, charging resistor R5~R7, R8~R10 are power ripple resistance, good heat dissipation effect, surface coating
High fire-retardance inorganic coating, effective protection resistance wire is not oxidized, and resistance to power rush characteristic is strong.
For cascaded high-voltage frequency converter, phase-shifting transformer vice-side winding realizes that multiplex is whole by extend-triangle technology
Stream, each phase-shifting transformer vice-side winding differential seat angle are 60 °/N, and N is phase-shifting transformer vice-side winding quantity.When N=8, for pair
The phase-shifting transformer of 8 winding of side, phase shift angle difference are 7.5 °.The Phase shift winding of two or more phase-shifting transformers, phase shifting angle
Degree is sequentially distributed according to multiplex phase shift angle, auxiliary winding and primary side winding same-phase.Low-tension supply and auxiliary winding
Voltage rating is exchange 380V.
Shown in Figure 3, each phase-shifting transformer is provided with 1 primary side winding, 4 secondary side Phase shift windings, 1 and primary sides
With phase low pressure auxiliary winding.4 Phase shift windings of T1 phase-shifting transformer with respect to primary side winding, phase shift angle is respectively 26.25 °,
18.75 °, 11.25 °, 3.75 °, phase shift angle be 26.25 ° winding respectively with power cell A1, power cell B1, power list
The input terminal of first C1 connects, the winding that phase shift angle is 18.75 ° respectively with power cell A2, power cell B2, power cell C2
Input terminal connection, phase shift angle be 11.25 ° winding respectively with power cell A3, power cell B3, power cell C3 it is defeated
Enter end connection, the winding input terminal with power cell A4, power cell B4, power cell C4 respectively that phase shift angle is 3.75 °
Connection.4 Phase shift windings of second phase-shifting transformer T2 with respect to primary side winding, phase shift angle is respectively -3.75 °, -11.25 °, -
18.75 °, -26.25 °, the winding that phase shift angle is -3.75 ° respectively with power cell A5, power cell B5, power cell C5
Input terminal connection, phase shift angle be -11.25 ° winding respectively with power cell A6, power cell B6, power cell C6 it is defeated
Enter end connection, the winding input with power cell A7, power cell B7, power cell C7 respectively that phase shift angle is -18.75 °
End connection, the winding input terminal with power cell A8, power cell B8, power cell C8 respectively that phase shift angle is -26.25 °
Connection.
The output of high-voltage frequency converter is sequentially connected in series by the output of power cell：Power cell A1-A8 is composed in series height
Voltage frequency changer A phase exports, power cell B1-B8 is composed in series that high-voltage frequency converter B phase exports, power cell C1-C8 is composed in series
High-voltage frequency converter C phase exports.
The primary side winding of T1, T2 are in parallel, are connected after in parallel with excitation surge restraint circuit；T1, T2 low pressure auxiliary around
Group is connected with charging surge restraint circuit respectively.
Although phase-shifting transformer separate unit vice-side winding is reduced in the present invention, but still is moved according to whole system vice-side winding
Phase angle design.The power cell rectification link being connect with vice-side winding is using uncontrollable rectifier, due to vice-side winding phase shifting angle
Degree is still designed by multiple rectifying, and primary side is in parallel, the harmonic voltage content and 8 winding phase-shifting transformer primary side harmonic wave of separate unit of primary side
Voltage content is equivalent consistent.
The embodiment of the present invention also provides a kind of side of inhibition surge based on above-mentioned super high power cascaded high-voltage frequency converter
Method includes the following steps：
S1, power cell precharge operation, the first air-break circuit-breaker Q1 of closure, the second sky are carried out to high-voltage frequency converter first
Gas circuit breaker Q 2, third air-break circuit-breaker Q3 access the auxiliary winding of low pressure 380V power supply and T1, T2；Complete machine control unit hair
Precharge command out, closure the second charging contactor KM2, the first charging contactor KM1 are then closed, and auxiliary winding is powered, and moves
Phase winding generates induced voltage, and power cell slowly gives capacitor charging by charging resistor R5~R7, R8~R10；First charging
After the control coil of contactor KM1 takes the normally opened contact of the second charging contactor KM2, the second charging contactor KM2 to be closed, first
Charging contactor KM1 can be just closed.
S2, when capacitance voltage reach preset voltage value (such as 400V or so) when, power cell internal control power supply obtain it is electric
Work starts to send information to upper layer complete machine control unit by optical fiber, when top level control unit detects that capacitance voltage rises
To rated operational voltage preset ratio (such as 80%) when, issuing precharge terminates order, and the second charging contactor KM2 is disconnected
It opens, subsequent first charging contactor KM1 is disconnected；First charging contactor KM1 and the second charging contactor KM2 mechanical latching are set
Purpose be, prevent due to manufacturing process error, T1, T2 auxiliary winding difference phase after high pressure powers on, exist between auxiliary winding
Circulation.
S3, after the completion of confirming precharge operation, the first charging contactor KM1, the second charging contactor KM2 be in disconnect
State, closed high inlet wire the first vacuum circuit breaker QF1, T1 and T2 primary side winding access high voltage power supply by charging resistor R0,
Due to the effect of charging resistor R0, phase-shifting transformer primary side excitation surge is effectively suppressed.
After S4, the first vacuum circuit breaker QF1 closure a period of time (about 2s), the second vacuum circuit breaker QF2 closure, charging electricity
Resistance R0 is shorted.
Super high power high-voltage frequency converter of the present invention does not use more middle low power high-voltage frequency converter parallel ways.One-of-a-kind system
Scheme is changed to two or more phase-shifting transformers, multiple groups power cell group by separate unit phase-shifting transformer, multiple groups power cell mode
At reducing phase-shifting transformer producting process difficulty.Power cell all configures charging resistor and contactor side by traditional every
Case is changed to concentrate charging scheme by auxiliary winding, reduces power cell production cost.More transformer primary side parallel connections, primary side
Excitation surge restraint circuit is accessed, system electrification surge impact is effectively reduced.
Generally speaking, the super high power cascaded high-voltage frequency converter in the embodiment of the present invention, manufacturing process is simple, property
For valence than high, technical difficulty is low, can effectively improve the reliability of device, while volume of transformer is small, facilitates installation, transport.
Those skilled in the art can carry out various modifications to the embodiment of the present invention and modification, if these modifications and change
For type within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention
Within.
The prior art that the content being not described in detail in specification is known to the skilled person.
Claims (13)
1. a kind of super high power cascaded high-voltage frequency converter, including two or more phase-shifting transformer groups, 24 power cell A1
~A8, B1~B8, C1~C8, high pressure 10kV power supply, low pressure 380V power supply, excitation surge restraint circuit, it is characterised in that：It is described
High pressure 10kV power supply is connected by excitation surge restraint circuit with phase-shifting transformer primary side winding, phase-shifting transformer vice-side winding and
24 power cell A1~A8, B1~B8, C1~C8 are connected, and phase-shifting transformer is provided with low pressure auxiliary winding；The excitation wave
Gushing suppression circuit includes the first vacuum circuit breaker QF1, the second vacuum circuit breaker QF2, charging resistor R0, the first vacuum circuit breaker
One end of QF1 is connected with high pressure 10kV power supply, and the other end is connected with one end of charging resistor R0, the other end of charging resistor R0 with
The input terminal of frequency converter is connected, and the second vacuum circuit breaker QF2 is connected in parallel on the both ends of charging resistor R0, each phase-shifting transformer pair side around
Group differential seat angle is 60 °/N, and N is phase-shifting transformer vice-side winding quantity, and the Phase shift winding of two or more phase-shifting transformers moves
Phase angle is sequentially distributed according to multiplex phase shift angle, auxiliary winding and primary side winding same-phase；
When N=8, for the phase-shifting transformer of secondary 8 winding of side, phase shift angle difference is 7.5 °；Each phase-shifting transformer is provided with 1
Primary side winding, 4 secondary side Phase shift windings, 1 with primary side with phase low pressure auxiliary winding, 4 Phase shift windings of T1 with respect to primary side around
Group, phase shift angle are respectively 26.25 °, 18.75 °, 11.25 °, 3.75 °, the winding that phase shift angle is 26.25 ° respectively with power
Unit A1, power cell B1, power cell C1 input terminal connection, phase shift angle be 18.75 ° winding respectively with power cell
A2, power cell B2, power cell C2 input terminal connection, phase shift angle be 11.25 ° winding respectively with power cell A3,
Power cell B3, power cell C3 input terminal connection, phase shift angle be 3.75 ° winding respectively with power cell A4, power
The input terminal connection of unit B 4, power cell C4；4 Phase shift windings of T2 with respect to primary side winding, phase shift angle is respectively-
3.75 °, -11.25 °, -18.75 °, -26.25 °, phase shift angle be -3.75 ° winding respectively with power cell A5, power cell
B5, power cell C5 input terminal connection, phase shift angle be -11.25 ° winding respectively with power cell A6, power cell B6,
The input terminal of power cell C6 connects, the winding that phase shift angle is -18.75 ° respectively with power cell A7, power cell B7, function
The input terminal of rate unit C7 connects, the winding that phase shift angle is -26.25 ° respectively with power cell A8, power cell B8, power
The input terminal of unit C8 connects.
2. super high power cascaded high-voltage frequency converter as described in claim 1, it is characterised in that：Each power cell includes 6
A rectifier diode D1~D6,3 capacitor C1~C3,3 equalizing resistance R1~R3,4 insulated gate bipolar transistor T1~T4,
2 AC output terminal CL1~CL2, power cell ABC three-phase input end take electricity from phase-shifting transformer vice-side winding, by D1~
After the rectifier bridge rectification that D6 is constituted, energy storage is filtered by capacitor C1~C3, control T1~T4 is successively led by SPWM sinusoidal pulse width modulation
It is logical, it is ac square-wave voltage by the output of CL1, CL2 ac output end by DC bus-bar voltage inversion.
3. super high power cascaded high-voltage frequency converter as claimed in claim 2, it is characterised in that：The high-voltage frequency converter is also wrapped
Charging surge restraint circuit is included, low pressure 380V power supply is connected by the surge restraint circuit that charges with auxiliary winding.
4. super high power cascaded high-voltage frequency converter as claimed in claim 3, it is characterised in that：Capacitor C1~the C3 is in function
Short circuit occurs for the moment that rate unit powers on, and inhibits charging surge current by charging surge restraint circuit.
5. super high power cascaded high-voltage frequency converter as claimed in claim 3, it is characterised in that：The charging Surge suppression electricity
Road include the first air-break circuit-breaker Q1, the first charging contactor KM1, be connected in three-phase line respectively charging resistor R5~
R7, the second air-break circuit-breaker Q2, the second charging contactor KM2, the charging resistor R8~R10 being connected in three-phase line respectively,
Third air-break circuit-breaker Q3, the first phase-shifting transformer T1 auxiliary winding and the second phase-shifting transformer T2 auxiliary winding, the first air
The input terminal of circuit breaker Q 1 is connected with low pressure 380V power supply, the output end and the first charging contactor of the first air-break circuit-breaker Q1
The input terminal of KM1 connects, and the output of the first charging contactor KM1 is divided into two branches：First branch and it is connected on three respectively
Resistance R5~R7, the second air-break circuit-breaker Q2 series connection in phase line, the output end of the second air-break circuit-breaker Q2 and the first phase shift
The auxiliary winding of transformer T1 is connected；Article 2 branch and the second charging contactor KM2, the electricity being connected in three-phase line respectively
R8~R10, third air-break circuit-breaker Q3 series connection are hindered, the output end of third air-break circuit-breaker Q3 is auxiliary with the second phase-shifting transformer T2's
Winding is helped to be connected.
6. super high power cascaded high-voltage frequency converter as claimed in claim 5, it is characterised in that：The charging resistor R0, it fills
Resistance R5~R7, R8~R10 are power ripple resistance, and surface coats high fire-retardance inorganic coating.
7. super high power cascaded high-voltage frequency converter as claimed in claim 5, it is characterised in that：Phase-shifting transformer pair side
Winding realizes multiple rectifying by extend-triangle technology.
8. super high power cascaded high-voltage frequency converter as claimed in claim 7, it is characterised in that：The high-voltage frequency converter it is defeated
It is sequentially connected in series out by the output of power cell：Power cell A1-A8 be composed in series high-voltage frequency converter A phase export, power list
First B1-B8 is composed in series that high-voltage frequency converter B phase exports, power cell C1-C8 is composed in series high-voltage frequency converter C phase and exports.
9. super high power cascaded high-voltage frequency converter as claimed in claim 5, it is characterised in that：The primary side winding of T1, T2 are simultaneously
Connection is connected after in parallel with excitation surge restraint circuit；The low pressure auxiliary winding of T1, T2 respectively with charging surge restraint circuit phase
Connection.
10. a kind of method of the inhibition surge based on super high power cascaded high-voltage frequency converter described in claim 5, feature exist
In including the following steps：
S1, power cell precharge operation is carried out to high-voltage frequency converter first, the first air-break circuit-breaker Q1 of closure, the second air are disconnected
Road device Q2, third air-break circuit-breaker Q3 access the auxiliary winding of low pressure 380V power supply and T1, T2；Complete machine control unit issues pre-
Charge command, closure the second charging contactor KM2, the first charging contactor KM1 are then closed, and auxiliary winding is powered, phase shift around
Group generates induced voltage, and power cell slowly gives capacitor charging by charging resistor R5~R7, R8~R10；First charge contact
After the control coil of device KM1 takes the normally opened contact of the second charging contactor KM2, the second charging contactor KM2 to be closed, the first charging
Contactor KM1 can be just closed；
S2, when capacitance voltage reach preset voltage value when, power cell internal control power supply work once electrified, by optical fiber start to
Upper layer complete machine control unit sends information, when top level control unit detects that capacitance voltage rises to the default of rated operational voltage
When ratio, issuing precharge terminates order, and the second charging contactor KM2 is disconnected, and subsequent first charging contactor KM1 is disconnected；
S3, after the completion of confirming precharge operation, the first charging contactor KM1, the second charging contactor KM2 be in disconnect shape
State, closed high inlet wire the first vacuum circuit breaker QF1, T1 and T2 primary side winding access high voltage power supply by charging resistor R0, move
Phase transformer primary side excitation surge is effectively suppressed；
After S4, the first vacuum circuit breaker QF1 are closed a period of time, the second vacuum circuit breaker QF2 is closed, and charging resistor R0 is short
It connects.
11. inhibiting the method for surge as claimed in claim 10, it is characterised in that：In step S2, the preset voltage value is
400V。
12. inhibiting the method for surge as claimed in claim 10, it is characterised in that：In step S2, the preset ratio is
80%.
13. inhibiting the method for surge as claimed in claim 10, it is characterised in that：In step S4, first vacuum circuit breaker
The time of device QF1 closure is 2 seconds.
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| CN105429265B (en) * | 2015-12-28 | 2018-06-22 | 深圳市库马克新技术股份有限公司 | A kind of Anti-surging charging circuit applied on high frequency transformer |
| CN107834865B (en) * | 2017-11-21 | 2020-04-03 | 北京合力电气传动控制技术有限责任公司 | High-voltage frequency converter and system |
| CN110246661A (en) * | 2019-04-23 | 2019-09-17 | 大禹电气科技股份有限公司 | A kind of phase-shifting transformer for parallel-operation expansion |
| CN110224583A (en) * | 2019-04-23 | 2019-09-10 | 大禹电气科技股份有限公司 | A kind of high-pressure frequency-conversion soft starter device |
| CN112803805A (en) * | 2021-03-15 | 2021-05-14 | 机械工业第九设计研究院有限公司 | Multi-port direct-current power supply and combined control method |
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| CN201629677U (en) * | 2010-04-03 | 2010-11-10 | 东方电子股份有限公司 | Pre-charging circuit for high-voltage frequency converter using high-voltage technology |
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