CN105048825A - Super-power cascade type high-voltage inverter and method for surge inhibiting of super-power cascade type high-voltage inverter - Google Patents
Super-power cascade type high-voltage inverter and method for surge inhibiting of super-power cascade type high-voltage inverter Download PDFInfo
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Abstract
The invention discloses a super-power cascade type high-voltage inverter and a method for surge inhibiting of the super-power cascade type high-voltage inverter and relates to the field of high-voltage frequency conversion. The super-power cascade type high-voltage inverter comprises two or more phase-shifting transformer sets, 24 power units with the numbers of A1-A8, B1-B8 and C1-C8, a high-voltage 10 kV power source, a low-voltage 380 V power source and an excitation surge inhibiting circuit. The high-voltage 10 kV power source is connected with primary-side windings of phase-shifting transformers through the excitation surge inhibiting circuit. Secondary side windings of the phase-shifting transformers are connected with the 24 power units with the numbers of A1-A8, B1-B8 and C1-C8. The phase-shifting transformers are provided with low-voltage auxiliary windings. The excitation surge inhibitingcircuit comprises a first vacuum circuit breaker QF1, a second vacuum circuit breaker QF2 and a current-limiting resistor R0. The super-power cascade type high-voltage inverter and the method for surge inhibiting of the super-power cascade type high-voltage inverter can effectively inhibit excitation surges, the reliability and stability of products are improved, cost is reduced, the production difficulty of the phase-shifting transformers is lowered, and later-stage carrying and installing are convenient.
Description
Technical field
The present invention relates to high-pressure frequency-conversion field, specifically relate to a kind of method of super high power cascaded high-voltage frequency converter and suppression surge thereof.
Background technology
The industrialized fast development of China facilitates motor Manufacture and application to high-power future development.Super high power cascaded high-voltage frequency converter, in order to drag high-voltage high-power motor, is widely used in metallurgy, petrochemical industry, chemical industry.In super high power application scenario; more than 20 megawatts are concentrated on as blast furnace in metallurgical industry power of fan; often employing two or the parallel connection of multiple stage high voltage converter drag; shown in Figure 1; the technical difficulty of parallel operation is comparatively large, and multiple stage high voltage converter runs simultaneously, wherein any one when breaking down; whole combining system will running overload or shutdown, has a strong impact on the reliability and stability of system.
The core of super high power cascaded high-voltage frequency converter is made up of Multiple coil phase shifting transformer and many group power cells.High-power phase shifting transformer powered on moment, excitatory surge is very large.Meanwhile, power cell internal has a large amount of Capacitor banks as the Support Capacitor of rectification link, and these electric capacity are equivalent to short circuit at charging transient, and charging surge is very large.If the excitatory surge of super high power cascaded high-voltage frequency converter powered on moment and charging surge are not suppressed, easily cause higher level's switch trip, impact is with the normal operation of other equipment of net.
Shown in Figure 2, in order to the charging surge preventing power cell electric capacity powered on moment from causing, traditional way is serial connection charge resistance R4 between power cell internal DC bus and electric capacity C1 ~ C3, meets charging contactor K1 at the two ends of charging resistor R4.At power cell powered on moment, by charging resistor R4, capacitance group C1-C3 is charged.
When capacitance voltage reaches certain voltage value, closed charging contactor K1, short circuit charging resistor R4.The each power cell internal of the method needs to install charging resistor and charging contactor, and the control circuit of correspondence, not only increases cost, also add complex process degree, and reduce the reliability of product.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of method of super high power cascaded high-voltage frequency converter and suppression surge thereof is provided, can effectively suppress excitatory surge, improve the reliability and stability of product, can reduce costs, the production difficulty of effective reduction phase shifting transformer, facilitates later stage carrying and installation.
The invention provides a kind of super high power cascaded high-voltage frequency converter, comprise two or more phase shifting transformer group, 24 power cell A1 ~ A8, B1 ~ B8, C1 ~ C8, high pressure 10kV power supply, low pressure 380V power supply, excitatory surge restraint circuit, described high pressure 10kV power supply is connected with phase shifting transformer former limit winding by excitatory surge restraint circuit, 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 and assists winding; Described excitatory surge restraint circuit comprises the first vacuum circuit-breaker QF1, the second vacuum circuit-breaker QF2, charging resistor R0, one end of first vacuum circuit-breaker QF1 is connected with high pressure 10kV power supply, the other end is connected with one end of charging resistor R0, the other end of charging resistor R0 is connected with the input of frequency converter, and the second vacuum circuit-breaker QF2 is connected in parallel on the two ends of charging resistor R0.
On the basis of technique scheme, each power cell comprises 6 rectifier diode D1 ~ D6,3 electric capacity C1 ~ C3,3 grading resistor R1 ~ R3,4 igbt T1 ~ T4,2 AC output terminal CL1 ~ CL2, power cell ABC three-phase input end is from the power taking of phase shifting transformer vice-side winding, after the rectifier bridge rectification be made up of D1 ~ D6, by electric capacity C1 ~ C3 filtering energy storage, control T1 ~ T4 presses the conducting successively of SPWM sinusoidal pulse width modulation, is that ac square-wave voltage is exported by CL1, CL2 ac output end by DC bus-bar voltage inversion.
On the basis of technique scheme, described high voltage converter also comprises charging surge restraint circuit, and low pressure 380V power supply is connected with auxiliary winding by charging surge restraint circuit.
On the basis of technique scheme, the moment that described electric capacity C1 ~ C3 powers at power cell is short-circuited, and suppresses charging surge current by charging surge restraint circuit.
On the basis of technique scheme, described charging surge restraint circuit comprises the first air circuit Q1, first charging contactor KM1, be connected on the charging resistor R5 ~ R7 in three-phase line respectively, second air circuit Q2, second charging contactor KM2, be connected on the charging resistor R8 ~ R10 in three-phase line respectively, 3rd air circuit Q3, first phase shifting transformer T1 assists winding and the second phase shifting transformer T2 to assist winding, the input of the first air circuit Q1 is connected with low pressure 380V power supply, the output of the first air circuit Q1 is connected with the input of the first charging contactor KM1, the output of the first charging contactor KM1 is divided into two branch roads: Article 1 branch road and the resistance R5 ~ R7 be connected on respectively in three-phase line, second air circuit Q2 connects, the output of the second air circuit Q2 is connected with the auxiliary winding of the first phase shifting transformer T1, Article 2 branch road is connected with the second charging contactor KM2, respectively resistance R8 ~ R10, the 3rd air circuit Q3 be connected in three-phase line, and the output of the 3rd air circuit Q3 is connected with the auxiliary winding of the second phase shifting transformer T2.
On the basis of technique scheme, described current-limiting resistance R0, charging resistor R5 ~ R7, R8 ~ R10 are power ripple resistance, surface-coated high flame retardant inorganic coating.
On the basis of technique scheme, described phase shifting transformer secondary reaches the object of multiple rectifying by extend-triangle technology, and each Phase shift winding differential seat angle is 60 °/and N, N are phase shifting transformer vice-side winding quantity.
On the basis of technique scheme, during N=8, for the phase shifting transformer of secondary 8 winding, phase shift differential seat angle is 7.5 °, each phase shifting transformer is provided with 1 former limit winding, 4 secondary Phase shift winding, winding is assisted for 1 with former limit homophase low pressure, 4 Phase shift winding relatively former limit windings of T1, 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, the input of power cell C1 connects, phase shift angle be 18.75 ° winding respectively with power cell A2, power cell B2, the input of power cell C2 connects, phase shift angle be 11.25 ° winding respectively with power cell A3, power cell B3, the input of power cell C3 connects, phase shift angle be 3.75 ° winding respectively with power cell A4, power cell B4, the input of power cell C4 connects, 4 Phase shift winding relatively former limit windings of T2, 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, the input of power cell C5 connects, phase shift angle be-11.25 ° winding respectively with power cell A6, power cell B6, the input of power cell C6 connects, phase shift angle be-18.75 ° winding respectively with power cell A7, power cell B7, the input of power cell C7 connects, phase shift angle be-26.25 ° winding respectively with power cell A8, power cell B8, the input of power cell C8 connects.
On the basis of technique scheme, the output of described high voltage converter is composed in series successively by the output of power cell: power cell A1-A8 is composed in series that high voltage converter A phase exports, power cell B1-B8 is composed in series that high voltage converter B phase exports, power cell C1-C8 is composed in series high voltage converter C phase and exports.
On the basis of technique scheme, the former limit winding parallel of T1, T2, is connected with excitatory surge restraint circuit after in parallel; The low pressure of T1, T2 assists winding to be connected with charging surge restraint circuit respectively.
The present invention also provides a kind of method of the suppression surge based on above-mentioned super high power cascaded high-voltage frequency converter, comprises the following steps:
S1, first power cell precharge operation is carried out to high voltage converter, closed first air circuit Q1, the second air circuit Q2, the 3rd air circuit Q3, the auxiliary winding of access low pressure 380V power supply and T1, T2; Complete machine control unit sends precharge command, closed second charging contactor KM2, the first charging contactor KM1 closes subsequently, auxiliary winding energising, Phase shift winding produces induced voltage, and power cell slowly gives capacitor charging by charging resistor R5 ~ R7, R8 ~ R10; The control coil of the first charging contactor KM1 gets the normally opened contact of the second charging contactor KM2, and after the second charging contactor KM2 is closed, the first charging contactor KM1 just can close;
S2, when capacitance voltage arrive preset voltage value time, power cell internal controls power supply and obtains electric work, start to send information to upper strata complete machine control unit by optical fiber, when top level control unit inspection rises to the preset ratio of rated operational voltage to capacitance voltage, send precharge the finish command, second charging contactor KM2 disconnects, and the first charging contactor KM1 disconnects subsequently;
S3, after in confirmation, precharge operation completes, first charging contactor KM1, the second charging contactor KM2 are in off-state, closed high inlet wire first vacuum circuit-breaker QF1, T1 and T2 former limit winding accesses high voltage source by current-limiting resistance R0, and the excitatory surge in the former limit of phase shifting transformer is effectively suppressed;
After S4, the first vacuum circuit-breaker QF1 close a period of time, the second vacuum circuit-breaker QF2 closes, and current-limiting resistance R0 is by short circuit.
On the basis of technique scheme, in step S2, described preset voltage value is 400V.
On the basis of technique scheme, in step S2, described preset ratio is 80%.
On the basis of technique scheme, in step S4, the time that described first vacuum circuit-breaker QF1 is closed is 2 seconds.
Compared with prior art, advantage of the present invention is as follows:
(1), in prior art, general employing multi-machine parallel connection scheme under high-power applications occasion, all connecing reactor carries out current-sharing usually in inverter parallel output, plays loop current suppression.Compared with the multi-machine parallel connection scheme under high-power applications occasion, super high power cascaded high-voltage frequency converter in the present invention directly connects user's motor, export without the need to equalizing reactor, excitatory surge restraint circuit can effectively suppress excitatory surge, improves the reliability and stability of product.
(2) be provided with charging surge restraint circuit in the present invention, effectively can suppress the surge that charges, improve the reliability and stability of product.
(3) with increase compared with power resistor, contactor and corresponding control circuit at each power cell internal, the present invention eliminates charging resistor R4 and charging contactor K1 at each power cell internal, the phase shifting transformer of conventional stage connection type high-voltage frequency converter is decomposed into two or more phase shifting transformer, and phase shifting transformer secondary Phase shift winding correspondence reduces.In super high power application scenario, separate unit phase shifting transformer is due to capacity and winding minimizing, and can significantly reduce costs, cost performance is high, and economic benefit is obvious; The production difficulty of phase shifting transformer can also be reduced, facilitate later stage carrying and installation, improve the reliability and stability of product.
Accompanying drawing explanation
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 excitatory surge restraint circuit in the embodiment of the present invention.
Fig. 6 is the circuit diagram of surge restraint circuit of charging in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, 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, comprises two or more phase shifting transformer group, 24 power cell A1 ~ A8, B1 ~ B8, C1 ~ C8, high pressure 10kV power supply, low pressure 380V power supply, charging surge restraint circuit, excitatory surge restraint circuit.High pressure 10kV power supply is connected with phase shifting transformer former limit winding by excitatory surge restraint circuit, phase shifting transformer vice-side winding is connected with 24 power cell A1 ~ A8, B1 ~ B8, C1 ~ C8, phase shifting transformer is provided with low pressure and assists winding, and low pressure 380V power supply is connected with auxiliary winding by charging surge restraint circuit.
Shown in Figure 4, each power cell comprises 6 rectifier diode D1 ~ D6,3 electric capacity C1 ~ C3,3 grading resistor R1 ~ R3,4 igbt T1 ~ T4,2 AC output terminal CL1 ~ CL2, power cell ABC three-phase input end is from the power taking of phase shifting transformer vice-side winding, after the rectifier bridge rectification be made up of D1 ~ D6, by electric capacity C1 ~ C3 filtering energy storage, control T1 ~ T4 presses the conducting successively of SPWM sinusoidal pulse width modulation, is that ac square-wave voltage is exported by CL1, CL2 ac output end by DC bus-bar voltage inversion.The moment that electric capacity C1 ~ C3 powers at power cell is short-circuited, and suppresses charging surge current, reduce the impact to rectifier bridge and capacitance group by charging surge restraint circuit.
Shown in Figure 5, excitatory surge restraint circuit comprises the first vacuum circuit-breaker QF1, the second vacuum circuit-breaker QF2, current-limiting resistance R0, one end of first vacuum circuit-breaker QF1 is connected with high pressure 10kV power supply, the other end is connected with one end of current-limiting resistance R0, the other end of current-limiting resistance R0 is connected with the input of frequency converter, and the second vacuum circuit-breaker QF2 is connected in parallel on the two ends of current-limiting resistance R0.
Shown in Figure 6, charging surge restraint circuit comprises the first air circuit Q1, first charging contactor KM1, be connected on the charging resistor R5 ~ R7 in three-phase line respectively, second air circuit Q2, second charging contactor KM2, be connected on the charging resistor R8 ~ R10 in three-phase line respectively, 3rd air circuit Q3, first phase shifting transformer T1 assists winding and the second phase shifting transformer T2 to assist winding, the input of the first air circuit Q1 is connected with low pressure 380V power supply, the output of the first air circuit Q1 is connected with the input of the first charging contactor KM1, the output of the first charging contactor KM1 is divided into two branch roads: Article 1 branch road and the resistance R5 ~ R7 be connected on respectively in three-phase line, second air circuit Q2 connects, the output of the second air circuit Q2 is connected with the auxiliary winding of the first phase shifting transformer T1, Article 2 branch road is connected with the second charging contactor KM2, respectively resistance R8 ~ R10, the 3rd air circuit Q3 be connected in three-phase line, and the output of the 3rd air circuit Q3 is connected with the auxiliary winding of the second phase shifting transformer T2.
Current-limiting resistance R0, charging resistor R5 ~ R7, R8 ~ R10 is power ripple resistance, good heat dissipation effect, surface-coated high flame retardant inorganic coating, and available protecting resistance wire is not oxidized, and resistance to power rush characteristic is strong.
For cascaded high-voltage frequency converter, phase shifting transformer secondary reaches the object of multiple rectifying by extend-triangle technology, and each Phase shift winding differential seat angle is 60 °/and N, N are phase shifting transformer vice-side winding quantity.During N=8, for the phase shifting transformer of secondary 8 winding, phase shift differential seat angle is 7.5 °.The Phase shift winding of two or more phase shifting transformer, its phase shift angle distributes successively according to multiplex phase shift angle, auxiliary winding and former limit winding same-phase.Low-tension supply and auxiliary winding rated voltage are and exchange 380V.
Shown in Figure 3, each phase shifting transformer be provided with 1 former limit winding, 4 secondary Phase shift winding, 1 assist winding with former limit homophase low pressure.4 Phase shift winding relatively former limit windings of T1 phase shifting transformer, 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, the input of power cell C1 connects, phase shift angle be 18.75 ° winding respectively with power cell A2, power cell B2, the input of power cell C2 connects, phase shift angle be 11.25 ° winding respectively with power cell A3, power cell B3, the input of power cell C3 connects, phase shift angle be 3.75 ° winding respectively with power cell A4, power cell B4, the input of power cell C4 connects.4 Phase shift winding relatively former limit windings of the second phase shifting transformer T2, 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, the input of power cell C5 connects, phase shift angle be-11.25 ° winding respectively with power cell A6, power cell B6, the input of power cell C6 connects, phase shift angle be-18.75 ° winding respectively with power cell A7, power cell B7, the input of power cell C7 connects, phase shift angle be-26.25 ° winding respectively with power cell A8, power cell B8, the input of power cell C8 connects.
The output of high voltage converter is composed in series successively by the output of power cell: power cell A1-A8 is composed in series that high voltage converter A phase exports, power cell B1-B8 is composed in series that high voltage converter B phase exports, power cell C1-C8 is composed in series high voltage converter C phase and exports.
The former limit winding parallel of T1, T2, is connected with excitatory surge restraint circuit after in parallel; The low pressure of T1, T2 assists winding to be connected with charging surge restraint circuit respectively.
Although in the present invention, phase shifting transformer separate unit vice-side winding reduces, but still carries out phase shift angle design according to whole system vice-side winding.The power cell rectification link be connected with vice-side winding adopts uncontrollable rectifier, because vice-side winding phase shift angle still presses multiple rectifying design, former limit is in parallel, and harmonic voltage content and the separate unit 8 winding phase shifting transformer former limit harmonic voltage content on former limit are that equivalence is consistent.
The embodiment of the present invention also provides a kind of method of the suppression surge based on above-mentioned super high power cascaded high-voltage frequency converter, comprises the following steps:
S1, first power cell precharge operation is carried out to high voltage converter, closed first air circuit Q1, the second air circuit Q2, the 3rd air circuit Q3, the auxiliary winding of access low pressure 380V power supply and T1, T2; Complete machine control unit sends precharge command, closed second charging contactor KM2, the first charging contactor KM1 closes subsequently, auxiliary winding energising, Phase shift winding produces induced voltage, and power cell slowly gives capacitor charging by charging resistor R5 ~ R7, R8 ~ R10; The control coil of the first charging contactor KM1 gets the normally opened contact of the second charging contactor KM2, and after the second charging contactor KM2 is closed, the first charging contactor KM1 just can close.
S2, when capacitance voltage arrive preset voltage value (such as about 400V) time, power cell internal controls power supply and obtains electric work, start to send information to upper strata complete machine control unit by optical fiber, when top level control unit inspection rises to preset ratio (such as 80%) of rated operational voltage to capacitance voltage, send precharge the finish command, second charging contactor KM2 disconnects, and the first charging contactor KM1 disconnects subsequently; The object arranging the first charging contactor KM1 and the second charging contactor KM2 mechanical latching is, prevents due to manufacturing process error, and T1, T2 assist winding not homophase, after high pressure powers on, there is circulation between auxiliary winding.
S3, after in confirmation, precharge operation completes, first charging contactor KM1, the second charging contactor KM2 are in off-state, closed high inlet wire first vacuum circuit-breaker QF1, T1 and T2 former limit winding accesses high voltage source by current-limiting resistance R0, due to the effect of current-limiting resistance R0, the excitatory surge in the former limit of phase shifting transformer is effectively suppressed.
After S4, the first vacuum circuit-breaker QF1 close a period of time (about 2s), the second vacuum circuit-breaker QF2 closes, and current-limiting resistance R0 is by short circuit.
Super high power high voltage converter of the present invention does not adopt multiple stage middle low power high voltage converter parallel way.One-of-a-kind system scheme changes two or multiple stage phase shifting transformer into by separate unit phase shifting transformer, many group power cell modes, many group power cells form, and reduces phase shifting transformer producting process difficulty.Power cell all configures charging resistor and contactor scheme by traditional every platform, changes into and concentrates charging scheme by auxiliary winding, reduces power cell production cost.Multiple stage transformer primary side is in parallel, and excitatory surge restraint circuit is accessed on former limit, effectively reduces system electrification surge impact.
Generally speaking, the super high power cascaded high-voltage frequency converter in the embodiment of the present invention, manufacturing process is simple, and cost performance is high, and technical difficulty is low, effectively can improve the reliability of device, and volume of transformer is little simultaneously, convenient installation, transport.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these amendments and modification are within the scope of the claims in the present invention and equivalent technologies thereof, then these revise and modification also within protection scope of the present invention.
The prior art that the content do not described in detail in specification is known to the skilled person.
Claims (14)
1. a super high power cascaded high-voltage frequency converter, comprise two or more phase shifting transformer group, 24 power cell A1 ~ A8, B1 ~ B8, C1 ~ C8, high pressure 10kV power supply, low pressure 380V power supply, excitatory surge restraint circuit, it is characterized in that: described high pressure 10kV power supply is connected with phase shifting transformer former limit winding by excitatory surge restraint circuit, 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 and assists winding; Described excitatory surge restraint circuit comprises the first vacuum circuit-breaker QF1, the second vacuum circuit-breaker QF2, charging resistor R0, one end of first vacuum circuit-breaker QF1 is connected with high pressure 10kV power supply, the other end is connected with one end of charging resistor R0, the other end of charging resistor R0 is connected with the input of frequency converter, and the second vacuum circuit-breaker QF2 is connected in parallel on the two ends of charging resistor R0.
2. super high power cascaded high-voltage frequency converter as claimed in claim 1, it is characterized in that: each power cell comprises 6 rectifier diode D1 ~ D6, 3 electric capacity C1 ~ C3, 3 grading resistor R1 ~ R3, 4 igbt T1 ~ T4, 2 AC output terminal CL1 ~ CL2, power cell ABC three-phase input end is from the power taking of phase shifting transformer vice-side winding, after the rectifier bridge rectification be made up of D1 ~ D6, by electric capacity C1 ~ C3 filtering energy storage, control T1 ~ T4 presses the conducting successively of SPWM sinusoidal pulse width modulation, be that ac square-wave voltage is by CL1 by DC bus-bar voltage inversion, CL2 ac output end exports.
3. super high power cascaded high-voltage frequency converter as claimed in claim 2, is characterized in that: described high voltage converter also comprises charging surge restraint circuit, and low pressure 380V power supply is connected with auxiliary winding by charging surge restraint circuit.
4. super high power cascaded high-voltage frequency converter as claimed in claim 3, is characterized in that: the moment that described electric capacity C1 ~ C3 powers at power cell is short-circuited, and suppresses charging surge current by charging surge restraint circuit.
5. super high power cascaded high-voltage frequency converter as claimed in claim 3, it is characterized in that: described charging surge restraint circuit comprises the first air circuit Q1, first charging contactor KM1, be connected on the charging resistor R5 ~ R7 in three-phase line respectively, second air circuit Q2, second charging contactor KM2, be connected on the charging resistor R8 ~ R10 in three-phase line respectively, 3rd air circuit Q3, first phase shifting transformer T1 assists winding and the second phase shifting transformer T2 to assist winding, the input of the first air circuit Q1 is connected with low pressure 380V power supply, the output of the first air circuit Q1 is connected with the input of the first charging contactor KM1, the output of the first charging contactor KM1 is divided into two branch roads: Article 1 branch road and the resistance R5 ~ R7 be connected on respectively in three-phase line, second air circuit Q2 connects, the output of the second air circuit Q2 is connected with the auxiliary winding of the first phase shifting transformer T1, Article 2 branch road is connected with the second charging contactor KM2, respectively resistance R8 ~ R10, the 3rd air circuit Q3 be connected in three-phase line, and the output of the 3rd air circuit Q3 is connected with the auxiliary winding of the second phase shifting transformer T2.
6. super high power cascaded high-voltage frequency converter as claimed in claim 5, is characterized in that: described current-limiting resistance R0, charging resistor R5 ~ R7, R8 ~ R10 are power ripple resistance, surface-coated high flame retardant inorganic coating.
7. super high power cascaded high-voltage frequency converter as claimed in claim 5, it is characterized in that: described phase shifting transformer secondary reaches the object of multiple rectifying by extend-triangle technology, each Phase shift winding differential seat angle is 60 °/N, N are phase shifting transformer vice-side winding quantity.
8. super high power cascaded high-voltage frequency converter as claimed in claim 7, it is characterized in that: during N=8, for the phase shifting transformer of secondary 8 winding, phase shift differential seat angle is 7.5 °, each phase shifting transformer is provided with 1 former limit winding, 4 secondary Phase shift winding, winding is assisted for 1 with former limit homophase low pressure, 4 Phase shift winding relatively former limit windings of T1, 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, the input of power cell C1 connects, phase shift angle be 18.75 ° winding respectively with power cell A2, power cell B2, the input of power cell C2 connects, phase shift angle be 11.25 ° winding respectively with power cell A3, power cell B3, the input of power cell C3 connects, phase shift angle be 3.75 ° winding respectively with power cell A4, power cell B4, the input of power cell C4 connects, 4 Phase shift winding relatively former limit windings of T2, 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, the input of power cell C5 connects, phase shift angle be-11.25 ° winding respectively with power cell A6, power cell B6, the input of power cell C6 connects, phase shift angle be-18.75 ° winding respectively with power cell A7, power cell B7, the input of power cell C7 connects, phase shift angle be-26.25 ° winding respectively with power cell A8, power cell B8, the input of power cell C8 connects.
9. super high power cascaded high-voltage frequency converter as claimed in claim 8, is characterized in that: the output of described high voltage converter is composed in series successively by the output of power cell: power cell A1-A8 is composed in series that high voltage converter A phase exports, power cell B1-B8 is composed in series that high voltage converter B phase exports, power cell C1-C8 is composed in series high voltage converter C phase and exports.
10. super high power cascaded high-voltage frequency converter as claimed in claim 5, is characterized in that: the former limit winding parallel of T1, T2, is connected after in parallel with excitatory surge restraint circuit; The low pressure of T1, T2 assists winding to be connected with charging surge restraint circuit respectively.
11. 1 kinds, based on the method for the suppression surge of super high power cascaded high-voltage frequency converter described in claim 5, is characterized in that, comprise the following steps:
S1, first power cell precharge operation is carried out to high voltage converter, closed first air circuit Q1, the second air circuit Q2, the 3rd air circuit Q3, the auxiliary winding of access low pressure 380V power supply and T1, T2; Complete machine control unit sends precharge command, closed second charging contactor KM2, the first charging contactor KM1 closes subsequently, auxiliary winding energising, Phase shift winding produces induced voltage, and power cell slowly gives capacitor charging by charging resistor R5 ~ R7, R8 ~ R10; The control coil of the first charging contactor KM1 gets the normally opened contact of the second charging contactor KM2, and after the second charging contactor KM2 is closed, the first charging contactor KM1 just can close;
S2, when capacitance voltage arrive preset voltage value time, power cell internal controls power supply and obtains electric work, start to send information to upper strata complete machine control unit by optical fiber, when top level control unit inspection rises to the preset ratio of rated operational voltage to capacitance voltage, send precharge the finish command, second charging contactor KM2 disconnects, and the first charging contactor KM1 disconnects subsequently;
S3, after in confirmation, precharge operation completes, first charging contactor KM1, the second charging contactor KM2 are in off-state, closed high inlet wire first vacuum circuit-breaker QF1, T1 and T2 former limit winding accesses high voltage source by current-limiting resistance R0, and the excitatory surge in the former limit of phase shifting transformer is effectively suppressed;
After S4, the first vacuum circuit-breaker QF1 close a period of time, the second vacuum circuit-breaker QF2 closes, and current-limiting resistance R0 is by short circuit.
12. methods suppressing surge as claimed in claim 11, it is characterized in that: in step S2, described preset voltage value is 400V.
13. methods suppressing surge as claimed in claim 11, it is characterized in that: in step S2, described preset ratio is 80%.
14. methods suppressing surge as claimed in claim 11, it is characterized in that: in step S4, the time that described first vacuum circuit-breaker QF1 is closed is 2 seconds.
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| CN201510613958.2A CN105048825B (en) | 2015-09-23 | 2015-09-23 | Super high power cascaded high-voltage frequency converter and its method for inhibiting surge |
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| CN201510613958.2A CN105048825B (en) | 2015-09-23 | 2015-09-23 | Super high power cascaded high-voltage frequency converter and its method for inhibiting surge |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105429265A (en) * | 2015-12-28 | 2016-03-23 | 深圳市库马克新技术股份有限公司 | Anti-surge charging circuit applied to high-frequency transformer |
| CN107834865A (en) * | 2017-11-21 | 2018-03-23 | 北京合力电气传动控制技术有限责任公司 | A kind of high voltage converter and system |
| 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 |
| 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 |
| 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 |
| CN113848411A (en) * | 2021-10-18 | 2021-12-28 | 天津瑞源电气有限公司 | Wind power full power converter double-branch low-energy-consumption temperature control type test platform |
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| CN105429265A (en) * | 2015-12-28 | 2016-03-23 | 深圳市库马克新技术股份有限公司 | Anti-surge charging circuit applied to high-frequency transformer |
| 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 |
| CN107834865A (en) * | 2017-11-21 | 2018-03-23 | 北京合力电气传动控制技术有限责任公司 | A kind of high voltage converter and system |
| 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 |
| 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 |
| 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 |
| 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 |
| CN113848411A (en) * | 2021-10-18 | 2021-12-28 | 天津瑞源电气有限公司 | Wind power full power converter double-branch low-energy-consumption temperature control type test platform |
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