CN101378243A - Dual inverter for side control of high-voltage motor speed-governing rotor - Google Patents
Dual inverter for side control of high-voltage motor speed-governing rotor Download PDFInfo
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- CN101378243A CN101378243A CNA2008101554061A CN200810155406A CN101378243A CN 101378243 A CN101378243 A CN 101378243A CN A2008101554061 A CNA2008101554061 A CN A2008101554061A CN 200810155406 A CN200810155406 A CN 200810155406A CN 101378243 A CN101378243 A CN 101378243A
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Abstract
The invention discloses a double inverter used for the control of a high voltage motor speed adjusting rotor side, which is applied to the stepless speed regulation of a wound rotor type motor loaded on blowers and pumps, and the like in the industries of electric power, cement and metallurgy, and the like. The double inverter comprises two independent inverters Q1 and Q2, and a double inversion three winding transformer T, wherein, the Q1 comprises six thyristors Q11 to Q16 and a reactor L3, the Q2 comprises six thyristors Q21 to Q26 and a reactor L4, the input terminal of the L3 of the Q1 is jointly connected together with the input terminal of the L4 of the Q2, the two input terminals are connected to the input anode terminal of the double inverter, the double inversion three winding transformer T is provided with three sets of windings, wherein, one set of the winding is arranged at the high voltage side and connected into Y-shape by three phases, two sets of the windings are arranged at the low voltage side, wherein, one set of the winding Tq1 is connected into the Y-shape by three phases, and the other set of the winding Tq2 is connected into triangular shape by three phases, the two sets of windings Tq1 and Tq2 at the low voltage side are designed to be phase-transferring windings, with the phase difference of 60 degrees. The double inverter can reduce harmonic wave influence and add no filtration devices simultaneously by the inversion transformer.
Description
(1) technical field
The present invention relates to a kind of double-inversion speed-governing technology of high-tension motor rotor-side control.Be widely used in the wound-rotor motor stepless speed regulation of the blower fan water pump class load of industries such as electric power, cement and metallurgy, be particularly suitable for the speed adjusting technique transformation project of winding motor.Belong to the mechanical ﹠ electrical technology field.
(2) background technology
The range of application of blower fan, water pump is extremely wide, its year power consumption account for 43% of total consumption.At present, this kind equipment mostly can not speed governing, can only adopt valve or deep bead to regulate flow to satisfy the requirement of load variations.In low-pressure system, variable-frequency control technique is quite ripe, can satisfy the needs in domestic speed governing market fully.And high-power (〉=250kW) in the high-pressure system, frequency control and high frequency chopping inner feedback speed-regulating are modes of speed regulation relatively more commonly used at present.
Frequency control is serially connected between power supply and the motor, therefore to bear whole power of motor, RHVC is regulated motor speed by changing stator frequency and voltage, and heavy-duty motor supply power voltage height (3-10kV), the withstand voltage manufacture level of power electronic device is low at present, frequency converter bears higher voltage, a large amount of power electronic device series operations, complex structure.
For construction project, adopting high frequency chopping inner feedback speed-regulating and frequency control all is feasible scheme.For transformation project, as former load motor is squirrel-cage, the frequency control scheme can be adopted,, the internal feedback motor need be replaced with as adopting the high frequency chopping inner feedback speed-regulating, squirrel-cage motor is originally scrapped, increased a large amount of investments, in addition, the motor after the replacing does not match with former motor mounting size, also need to transform the motor mounting basis, quantities is bigger.
At cement, highly energy-consuming industries such as metallurgy, exist a large amount of wound-rotor motors, this part motor is when carrying out reducing energy consumption, if adopt the frequency control scheme, need be the rotor leading wire short circuit of motor, if but frequency converter emerged in operation fault, when motor changes power frequency operation into, because the motor behind the rotor short circuit can not directly start (when wound-rotor motor normally starts, need seal in resistance at rotor loop and realize soft start), need again original coiling electric motor start-up system to be recovered, it is big to influence normal production and construction investment and quantities.If adopt traditional tandem control mode, by contravariant transformer to the electrical network feedback energy, though can reduce the capacity of contravariant transformer by copped wave control, power factor increases, but owing to there has not been the effect of the winding distribution harmonic carcellation of internal feedback regulating winding, and with the buffer action of high voltage source, traditional tandem chopping regulating speed mode exists the problem big to the harmonic effects of electrical network.
(3) summary of the invention
The objective of the invention is to for wound-rotor motor speed governing transformation project, overcome and adopt high-pressure frequency-conversion to need rotor winding short circuit but the direct shortcoming of power frequency startup, can keep former motor, providing a kind of can reduce harmonic effects simultaneously by contravariant transformer, need not increase the dual inverter that is used for the control of high-voltage motor speed-governing rotor side of filter again.
The object of the present invention is achieved like this: a kind of dual inverter that is used for the control of high-voltage motor speed-governing rotor side, it is characterized in that described dual inverter comprises two independently inverter Q1, Q2 and two inversion three-winding transformer T, described two independently inverter Q1, Q2 are connected in parallel, inverter Q1 comprises 6 thyristor Q11～Q16 and a reactor L3, the anode of the anode of the anode of thyristor Q11, thyristor Q13 and thyristor Q15 links together jointly, is connected to the output of reactor L3; The negative electrode of the negative electrode of the negative electrode of thyristor Q14 and thyristor Q16 and thyristor Q12 links together jointly, is connected to the input negative pole end (E end) of dual inverter; The three-phase alternating current output (A1, B1, C1) that the anode of the negative electrode of thyristor Q11 and thyristor Q14 links together jointly, the anode of the negative electrode of thyristor Q13 and thyristor Q16 links together jointly and the anode of the negative electrode of thyristor Q15 and thyristor Q12 links together jointly and constitutes inverter Q1 respectively
The inverter Q2 of same structure comprises 6 thyristor Q21～Q26 and a reactor L4, and the anode of the Q21 anode of thyristor, the negative electrode of thyristor Q23 and thyristor Q25 links together jointly, is connected to the output of reactor L4; The negative electrode of the negative electrode of the negative electrode of thyristor Q24, thyristor Q26 and thyristor Q22 links together jointly, is connected to the input negative pole end (E end) of dual inversion part; The three-phase alternating current output (A2, B2, C2) that the anode of the negative electrode of thyristor Q21 and thyristor Q24 links together jointly, the anode of the negative electrode of thyristor Q23 and thyristor Q26 links together jointly and the anode of the negative electrode of thyristor Q25 and thyristor Q22 links together jointly and constitutes inverter Q2 respectively
The input of the input of the reactor L3 of inverter Q1 and the reactor L4 of inverter Q2 links together jointly, is connected to the input positive terminal (P2 end) of dual inverter.
Described couple of inversion three-winding transformer T has three cover windings, wherein there is a cover winding high-pressure side, three-phase is connected into Y shape, be connected to high-tension motor power import side U, V, W, low-pressure side has two cover windings, and a cover winding Tq1 three-phase is connected into Y shape, be connected to the three-phase alternating current output (A1, B1, C1) of inverter Q1, another set of winding Tq2 three-phase is connected into Δ shape, is connected to the three-phase alternating current output (A2, B2, C2) of inverter Q2
The two cover winding Tq1 and the Tq2 of described low-pressure side are designed to the phase shift winding, 60 ° of phase phasic differences.
The present invention has following advantage:
1, for wound-rotor motor speed governing transformation project, can keep former motor, utilize one three winding phase shift contravariant transformer in this governing system, the power import side of energy back to motor, owing to adopted three winding contravariant transformers, harmonic effects can be reduced, filter need not be increased again.
2, can realize the parallel running of many speed regulating device, be particularly conducive to the operation control of vast capacity motor.For example, can be with the speed regulating device parallel running of two 3500KW, the winding motors of a 7000KW of control, doubly-fed motor or the operation of internal feedback motor speed adjusting, the present invention is particularly suitable in the speed governing operation of large pump motor (power is greater than 5000KW).
(4) description of drawings
Fig. 1 is used for the circuit diagram of the dual inverter of high-tension motor rotor-side control for the present invention.
Fig. 2 is the polar plot of dual inverter circuit running current of the present invention.
Fig. 3 is the oscillogram of dual inverter circuit running current of the present invention.
(5) embodiment
Referring to Fig. 1, the dual inverter that is used for high-tension motor rotor-side control that the present invention relates to, independently inverter Q1, Q2 and two inversion three-winding transformer T form by two.Described two independently inverter Q1, Q2 are connected in parallel.
Inverter Q1 is made up of 6 thyristor Q11～Q16 and a reactor L3.The anode of the anode of the anode of thyristor Q11, thyristor Q13 and thyristor Q15 links together jointly, is connected to the output of reactor L3; The negative electrode of the negative electrode of the negative electrode of thyristor Q14 and thyristor Q16 and thyristor Q12 links together jointly, is connected to the input negative pole end (E end) of dual inverter; The three-phase alternating current output (A1, B1, C1) that the anode of the negative electrode of thyristor Q11 and thyristor Q14 links together jointly, the anode of the negative electrode of thyristor Q13 and thyristor Q16 links together jointly and the anode of the negative electrode of thyristor Q15 and thyristor Q12 links together jointly and constitutes inverter Q1 respectively.
The inverter Q2 of same structure is made up of 6 thyristor Q21～Q26 and a reactor L4.The anode of the Q21 anode of thyristor, the negative electrode of thyristor Q23 and thyristor Q25 links together jointly, is connected to the output of reactor L4; The negative electrode of the negative electrode of the negative electrode of thyristor Q24, thyristor Q26 and thyristor Q22 links together jointly, is connected to the input negative pole end (E end) of dual inverter; The three-phase alternating current output (A2, B2, C2) that the anode of the negative electrode of thyristor Q21 and thyristor Q24 links together jointly, the anode of the negative electrode of thyristor Q23 and thyristor Q26 links together jointly and the anode of the negative electrode of thyristor Q25 and thyristor Q22 links together jointly and constitutes inverter Q2 respectively.
The input of the input of the reactor L3 of inverter Q1 and the reactor L4 of inverter Q2 links together jointly, is connected to the input positive terminal (P2 end) of dual inverter.
Described couple of inversion three-winding transformer T has three cover windings, and wherein there is a cover winding high-pressure side, and three-phase is connected into Y shape, is connected to high-tension motor power import side U, V, W.Low-pressure side has two cover windings, and a cover winding Tq1 three-phase is connected into Y shape, is connected to the three-phase alternating current output (A1, B1, C1) of inverter Q1, and another set of winding Tq2 three-phase is connected into Δ shape, is connected to the three-phase alternating current output (A2, B2, C2) of inverter Q2.Be used for dc inverter is become the alternating current of 50Hz; Two inversion three-winding transformer T are used for the low-voltage that inverter generates is transformed into high voltage, feed back to motor high pressure entry side.
The two cover winding Tq1 and the Tq2 of low-pressure side are designed to the phase shift winding, 60 ° of phase phasic differences, polar plot as shown in Figure 3, the electric current I 1a of Tq1 winding, I1b, I1c are than leading 60 ° of electric current I 2a, I2b, the I2c phase place of Tq2 winding, the inverter current waveform as shown in Figure 4, contravariant transformer high voltage side current Iu, Iv, Iw waveform harmonics content after vector is synthetic significantly reduce.Therefore, significantly reduce by the harmonic components in the contravariant transformer T output current wave after the dual inversion, under the situation of not taking any filtering measures, the standard of the quality of power supply can satisfy the requirement of " GB/T14549 quality of power supply utility network harmonic wave " fully.
Claims (1)
1, a kind of dual inverter that is used for the control of high-voltage motor speed-governing rotor side, it is characterized in that described dual inverter comprises two independently inverter Q1, Q2 and two inversion three-winding transformer T, described two independently inverter Q1, Q2 are connected in parallel, inverter Q1 comprises 6 thyristor Q11～Q16 and a reactor L3, the anode of the anode of the anode of thyristor Q11, thyristor Q13 and thyristor Q15 links together jointly, is connected to the output of reactor L3; The negative electrode of the negative electrode of the negative electrode of thyristor Q14 and thyristor Q16 and thyristor Q12 links together jointly, is connected to the input negative pole end (E end) of dual inverter; The three-phase alternating current output (A1, B1, C1) that the anode of the negative electrode of thyristor Q11 and thyristor Q14 links together jointly, the anode of the negative electrode of thyristor Q13 and thyristor Q16 links together jointly and the anode of the negative electrode of thyristor Q15 and thyristor Q12 links together jointly and constitutes inverter Q1 respectively
The inverter Q2 of same structure comprises 6 thyristor Q21～Q26 and a reactor L4, and the anode of the Q21 anode of thyristor, the negative electrode of thyristor Q23 and thyristor Q25 links together jointly, is connected to the output of reactor L4; The negative electrode of the negative electrode of the negative electrode of thyristor Q24, thyristor Q26 and thyristor Q22 links together jointly, is connected to the input negative pole end (E end) of dual inversion part; The three-phase alternating current output (A2, B2, C2) that the anode of the negative electrode of thyristor Q21 and thyristor Q24 links together jointly, the anode of the negative electrode of thyristor Q23 and thyristor Q26 links together jointly and the anode of the negative electrode of thyristor Q25 and thyristor Q22 links together jointly and constitutes inverter Q2 respectively
The input of the input of the reactor L3 of inverter Q1 and the reactor L4 of inverter Q2 links together jointly, is connected to the input positive terminal (P2 end) of dual inverter,
Described couple of inversion three-winding transformer T has three cover windings, wherein there is a cover winding high-pressure side, three-phase is connected into Y shape, be connected to high-tension motor power import side U, V, W, low-pressure side has two cover windings, and a cover winding Tq1 three-phase is connected into Y shape, be connected to the three-phase alternating current output (A1, B1, C1) of inverter Q1, another set of winding Tq2 three-phase is connected into Δ shape, is connected to the three-phase alternating current output (A2, B2, C2) of inverter Q2
The two cover winding Tq1 and the Tq2 of described low-pressure side are designed to the phase shift winding, 60 ° of phase phasic differences.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101554061A CN101378243A (en) | 2008-09-28 | 2008-09-28 | Dual inverter for side control of high-voltage motor speed-governing rotor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101554061A CN101378243A (en) | 2008-09-28 | 2008-09-28 | Dual inverter for side control of high-voltage motor speed-governing rotor |
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| CN101378243A true CN101378243A (en) | 2009-03-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710529B (en) * | 2009-12-02 | 2013-06-05 | 新能动力（北京）电气科技有限公司 | Three-phase reactor and alternative current circuit |
| CN106786770A (en) * | 2017-01-19 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of photovoltaic inversion unit and three-phase photovoltaic grid-connected TRT |
| CN109905050A (en) * | 2019-02-13 | 2019-06-18 | 苏州达方电子有限公司 | Power conversion system and its operating method |
| CN113572383A (en) * | 2021-06-16 | 2021-10-29 | 江苏固德威电源科技股份有限公司 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
-
2008
- 2008-09-28 CN CNA2008101554061A patent/CN101378243A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710529B (en) * | 2009-12-02 | 2013-06-05 | 新能动力（北京）电气科技有限公司 | Three-phase reactor and alternative current circuit |
| CN106786770A (en) * | 2017-01-19 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of photovoltaic inversion unit and three-phase photovoltaic grid-connected TRT |
| CN109905050A (en) * | 2019-02-13 | 2019-06-18 | 苏州达方电子有限公司 | Power conversion system and its operating method |
| CN113572383A (en) * | 2021-06-16 | 2021-10-29 | 江苏固德威电源科技股份有限公司 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
| CN113572383B (en) * | 2021-06-16 | 2023-03-03 | 固德威技术股份有限公司 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
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Open date: 20090304 |