CN202475351U - High power cross parallel frequency conversion soft-start device - Google Patents
High power cross parallel frequency conversion soft-start device Download PDFInfo
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- CN202475351U CN202475351U CN2012200683349U CN201220068334U CN202475351U CN 202475351 U CN202475351 U CN 202475351U CN 2012200683349 U CN2012200683349 U CN 2012200683349U CN 201220068334 U CN201220068334 U CN 201220068334U CN 202475351 U CN202475351 U CN 202475351U
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Abstract
The utility model discloses a high power cross parallel frequency conversion soft-start device. The soft-start device adopts double parallel high-low-high circuits; network voltage is lowered via an input voltage reduction transformer to a voltage range in which thyristors can normally and reliably operate; DC voltage is regulated via a rectifier module; a rotational speed is tracked via tracking the voltage and current of a motor stator; DC current is regulated in real time; smoothing reactors ensure that the current ripple is within a designed range; and inverter bridge components provide changes of frequency, as well as a stator voltage and a stator magnetic field which are in one-to-one correspondence with the position of a rotor according to the changes of the positions of the a motor rotor, and is coupled to a motor side via a step-up transformer, so that the motor can smoothly operate at a full speed under conditions of low current and no sudden change.
Description
Technical field
The utility model belongs to electric and electronic technical field, is specifically related to a kind of high-power alter-parallel formula variable frequency soft start device.
Background technology
The development trend of world today's pumped-storage power generation unit is high capacity, high water headization, high rotating speedization, adjustable speedization.Traditional synchronous startup method can't satisfy present requirement.The present homemade ability of large-size asynchronous motor is near 40MW, and power basically all is synchronous machine after doing greatly again.Along with the production capacity lifting of steel plant, blast furnace blower, the sintering blower fan, the power of motor of oxygenerator can be increasing, selects for use the chance of synchronous motor to get more and more.Large-scale synchronous machine can be regulated the power factor of electrical network, and along with the lifting of the maturation and the level of its manufacturing process, using also can be more and more wider.
At present, the mode that is applied in the high voltage synchronous machine soft start mainly contains following three kinds: the one, and asynchronous starting.Asynchronous starting is under unit excitation winding short circuit situation, directly generator/motor is connected to the grid, and utilizes the asynchronous moment that damping winding produces on the rotor magnetic pole to make startup of unit and acceleration, near synchronous speed the time, adds the excitation pull-in step.The asynchronous starting mode has full voltage starting, reduced voltage starting and part winding starting etc.The starting torque of this start mode is big, and starting current is also big, asks in wink and can cause greater impact to electrical network in starting, and in starting process, damping winding also will produce bigger heating and thermal stress, thereby be applicable to middle-size and small-size accumulation of energy unit usually simultaneously.The 2nd, synchronous initiation.Synchronous initiation is to start other accumulation of energy units with a conventional power generation usage unit or accumulation of energy unit operation.To be connected on electric with starting unit (generator) by starting unit (generator/motor) before the start; And add excitation respectively; The low-frequency power that produces with the generator that rotates directly is added on the generator/motor stator, generator/motor under the synchronous torque effect with generator raising speed progressively.In practical application because peripheral complex connection, control constant, so less use.The 3rd, coaxial startup.The coaxial motor starting selects for use the motor of a special use directly to be connected with boss rod usually, with the starting main frame.This coaxial motor generally lacks a pair of or several low capacity induction motors to number of poles than main frame, and corresponding synchronous rotating ratio main frame is higher, and capacity is generally the 6-8% of host capacity.During starting, with auxiliary motor main frame is dragged near synchronous speed earlier, with self-synchronizing method it is dropped into electrical network then, cut off the auxiliary motor power supply again.The on-the-spot property on probation of this method is low, and a lot of actual conditions almost can't carry out dragging many designs because the place is limited can't use.
Summary of the invention
The purpose of the utility model is that to overcome existing high-power synchronous motor startup electric current big, starts rotating speed and deficiency such as can't regulate continuously, and provide a kind of simple in structure, high-power alter-parallel formula variable frequency soft start device compact to design, reliable.
The utility model purpose is achieved in that a kind of high-power alter-parallel formula variable frequency soft start device; Comprise input transformer, rectifier bridge assembly, reactor, inverter bridge assembly, output transformer, current sensor and voltage sensor; It is characterized in that: the former limit of input transformer is a delta connection; It is consistent that secondary is exported two groups of independent winding voltages, is respectively triangle and star connection; The former limit of output transformer is two groups of low pressure windings, is respectively star and delta connection, and secondary output voltage grade is consistent with the grade of rated voltage of load motor, is delta connection; Rectifier bridge assembly, reactor and inverter bridge assembly are two groups, and the rectifier bridge assembly is connected between the secondary and reactor of input transformer, and the inverter bridge assembly is connected between the former limit of reactor and output transformer, and reactor is taked improved cross connect; Be serially connected with current sensor between rectifier bridge assembly and the reactor, inverter bridge assembly and output transformer are serially connected with current sensor between the former limit, and are connected to voltage sensor.
Described reactor is taked improved cross connect.
Compared with prior art, the utility model has the advantages that:
1, adopt the high system of height can reduce the voltage withstand class of a thyristor and an instrument transformer, the benefit of bringing can make things convenient for structural design, and is integrated very good, and reduced design cost, the destabilizing factor of having avoided the thyristor series connection to bring.
2, adopt secondary parallel way and reactor interconnection, not only greatly reduce transformer primary current harmonic wave, and reduced the design capacity of reactor.
3, output transformer does not break off process with transformer in whole starting process, has reduced rate of breakdown, has reduced maintenance cost.
4, simple in structure, compact to design, the complete machine integrated level is higher, places separately except transformer, and other are all installed in cabinet, and on-the-spot connection can also be satisfied and drags many designs.
Description of drawings
Fig. 1 is the utility model electrical schematic diagram.
Fig. 2 is the utility model one drag two electrical connection diagram.
Among the figure, input transformer 1, rectifier bridge assembly 2 and 3, reactor 4 and 5, inverter bridge assembly 6 and 7, output transformer 8, current sensor 9-14, voltage sensor 15 and 16, prime transformer 17, prime switch cubicle 18-20, switching cabinet 21, load motor 22 and 23.
Embodiment
Following examples combine accompanying drawing that the utility model is further described.
Referring to Fig. 1; Whole device adopts the high loop of two-in-parallel height, is made up of an input transformer 1, two groups of rectifier bridge assemblies 2 and 3, two groups of reactors 4 and 5, two groups of inverter bridge assemblies 6 and 7, output transformers 8, six current sensors 9-14 and two voltage sensors 15 and 16.Input transformer 1 is the input step-down transformer; Its input voltage is designed to the electrical network rated voltage; Be generally AC6KV, AC10KV, AC18KV, output voltage is less than AC4.5KV, and former limit is input as delta connection; It is consistent that secondary is exported two groups of independent winding voltages, is respectively triangle and star connection.Output transformer 8 is an output boostering transformer, and its former limit is two groups of low pressure windings, is respectively star and delta connection; Voltage is less than 4.5KV; Secondary output voltage grade is consistent with the grade of rated voltage of load motor, is delta connection, the no by-pass unit of output transformer (8).Rectifier bridge assembly 2 and 3 is connected between the secondary and reactor 4 and 5 of input transformer 1, inverter bridge assembly 6 and 7 be connected to reactor 4 and 5 and the former limit of output transformer 8 between, reactor 4 and 5 is taked improved cross connect.Two groups of rectifier bridge assemblies 2 and 3 are respectively six thyristors and relevant triggering and resistance-capacitance protection unit formed, and two groups of reactors 4 and 5 are dc flat-wave reactor.Two groups of inverter bridge assemblies 6 are respectively six thyristors and relevant triggering and resistance-capacitance protection unit composition with 7.Thyristor selects for use voltage withstand class more than 6500V, and through-current capability is at 200 ~ 2000A. Current sensor 9 and 10 be serially connected in respectively rectifier bridge assembly 2 and 3 and reactor 4 and 5 between; Current sensor 11-14 be serially connected in respectively inverter bridge assembly 6 and 7 and the former limit of output transformer 8 between, voltage sensor 15 and 16 is attempted by between the former limit of inverter bridge assembly 6 and output transformer 8.Current sensor 9-14 adopts the current Hall transducer, and voltage sensor 15 and 16 adopts voltage hall sensor.
The operation principle of the utility model is that device passes through to accomplish 6 pulse wave rectifiers with after the prime voltage step-down respectively through two groups of rectifier stacks 2 and 3, merges 12 impulse commutations of back completion system.Again through separately DC loop smoothing reactor 4 and 5; The direct current ripple coefficient is met the requirements of in the scope, output to two windings of output transformer 8, at the inner resultant flux of transformer through level thyristor inversion later; Be coupled to the former limit of output transformer 8, accomplish the transmission of energy.Through changing the voltage and the power frequency that sequential can be controlled output of opening of inverter bridge.Can change system's output current size through changing the rectifier and trigger angle, thereby change the motor power output, change the accelerating torque of motor, motor is normally started according to the speed curves of design.Current in loop transducer 9 and 10 is accomplished the current closed-loop sampling that control needs, and current sensor 11-14 is accomplished rotating speed of motor and rotor position detection required voltage and current signal sampling with voltage sensor 15 and 16.Output transformer 8 also can use during less than 1Hz at inverter bridge assembly 6 and 7 output voltage power frequencies normally, in the motor whole starting process, all has contravariant transformer, need not other switching device shifters.
Fig. 2 is the utility model one drag two electrical connection diagram.Among the figure, the input transformer of the utility model is connected with prime transformer 17 through switch cubicle 19, and output transformer logical 8 is crossed switching cabinet 21 and is connected with 23 with load motor 22.
The utility model is a target with the large synchronous motor startup; Adopt the design of alter-parallel formula, circuit design is simple and clear, and handling safety is reliable; Through the two-in-parallel loop; Reduce the conducting current requirements of thyristor, avoided the thyristor series connection to improve reliability, reduced peripheral by-pass unit through transformer and the direct connected mode of motor through the high frame mode of height.
Claims (2)
1. high-power alter-parallel formula variable frequency soft start device; Comprise input transformer (1), rectifier bridge assembly (2,3), reactor (4,5), inverter bridge assembly (6,7), output transformer (8), current sensor (9-14) and voltage sensor (15,16); It is characterized in that: the former limit of input transformer (1) is a delta connection; It is consistent that secondary is exported two groups of independent winding voltages, is respectively triangle and star connection; The former limit of output transformer (8) is two groups of low pressure windings, is respectively star and delta connection, and secondary output voltage grade is consistent with the grade of rated voltage of load motor, is delta connection; Rectifier bridge assembly (2,3), reactor (4,5) and inverter bridge assembly (6,7) are two groups; Rectifier bridge assembly (2,3) is connected between the secondary and reactor (4,5) of input transformer (1), and inverter bridge assembly (6,7) is connected between the former limit of reactor (4,5) and output transformer (8); Be serially connected with current sensor (9,10) between rectifier bridge assembly (2,3) and the reactor; Be serially connected with current sensor (11,12 and 13,14) between the former limit of inverter bridge assembly (6,7) and output transformer (8), and be connected to voltage sensor (15,16).
2. according to the said a kind of high-power alter-parallel formula variable frequency soft start device of claim 1, it is characterized in that described reactor (4,5) takes improved cross connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200683349U CN202475351U (en) | 2012-02-28 | 2012-02-28 | High power cross parallel frequency conversion soft-start device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200683349U CN202475351U (en) | 2012-02-28 | 2012-02-28 | High power cross parallel frequency conversion soft-start device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202475351U true CN202475351U (en) | 2012-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200683349U Expired - Fee Related CN202475351U (en) | 2012-02-28 | 2012-02-28 | High power cross parallel frequency conversion soft-start device |
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| Country | Link |
|---|---|
| CN (1) | CN202475351U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111669000A (en) * | 2019-03-08 | 2020-09-15 | 美的威灵电机技术（上海）有限公司 | Control circuit of rotor, rotor assembly, motor and compressor |
-
2012
- 2012-02-28 CN CN2012200683349U patent/CN202475351U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111669000A (en) * | 2019-03-08 | 2020-09-15 | 美的威灵电机技术（上海）有限公司 | Control circuit of rotor, rotor assembly, motor and compressor |
| CN111669000B (en) * | 2019-03-08 | 2021-09-21 | 美的威灵电机技术（上海）有限公司 | Control circuit of rotor, rotor assembly, motor and compressor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20190228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |