CN105391348A - Variable-frequency soft starting system for axial flow compressor and method thereof - Google Patents
Variable-frequency soft starting system for axial flow compressor and method thereof Download PDFInfo
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- CN105391348A CN105391348A CN201510961219.2A CN201510961219A CN105391348A CN 105391348 A CN105391348 A CN 105391348A CN 201510961219 A CN201510961219 A CN 201510961219A CN 105391348 A CN105391348 A CN 105391348A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
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Abstract
The invention relates to starting control of an axial flow compressor, and in particular relates to a variable-frequency soft starting system for the axial flow compressor and a method thereof. The system comprises a 1# power supply incoming cabinet (1AH), a 2# power supply incoming cabinet (2AH), a bus PT cabinet (3AH), a variable-frequency power supply cabinet (4AH) and a power-frequency operation cabinet (5AH) and further comprises a variable-frequency connection cabinet (6AH) and a variable-frequency starting cabinet (7AH), wherein the 1# power supply incoming cabinet (1AH), the 2# power supply incoming cabinet (2AH), the bus PT cabinet (3AH), the variable-frequency power supply cabinet (4AH) and the power-frequency operation cabinet (5AH) are connected to a bus; and the variable-frequency connection cabinet (6AH) and the variable-frequency starting cabinet (7AH) are connected to an auxiliary line. The starting control method is as follows: the static blade adjustability of the axial flow compressor itself is sufficiently utilized; the minimum starting power of the axial flow compressor is specially calculated; and the variable-frequency soft starting control system of the axial flow compressor is formed by adopting a corresponding frequency converter, a primary switch cabinet and secondary wiring and interlocking. The variable-frequency soft starting system disclosed by the invention has the effect that impact on a power grid is reduced when the axial flow compressor is started, such that voltage reduction is strictly controlled within -7%. The variable-frequency soft starting system disclosed by the invention has the advantages that: the configuration number of the primary switch cabinet is simplified; only three switch cabinets including a variable-frequency power supply cabinet, a variable-frequency switch cabinet and a variable-frequency starting cabinet are additionally arranged; configuration is simple; main wiring is reliable; secondary wiring and interlocking are simplified; the reliability is increased; and the engineering quantity is reduced.
Description
Technical field
The starting that the present invention relates to axial flow compressor controls, and is specifically related to a kind of variable frequency soft start system and method thereof of axial flow compressor.
Background technology
Axial flow compressor is one of core drive equipment in ironmaking processes, and power is large, and energy consumption is high, generally adopts Silence Process mechanism.For whole iron and steel enterprise, the operation conditions of axial flow compressor and the output of blast furnace, benefit, safety are closely bound up.Its control effects of axial flow compressor rationally, whether improve, determine the potential that can give full play to air blast to a great extent, to ensure conditions of blast furnace safety, stablize, to run necessary wind regime efficiently.
Generally have two kinds for driving prime mover of axial flow compressor: one is steam turbine, another kind is motor.Because Steam Turbine Driven mode needs to rely on stable steam supply, even need to build boiler dedicated auxiliary facility of Denging, no matter from cost, efficiency or adjusting function, be all far inferior to motor driven, therefore electric motor-driving way is generally adopted by steel industry.Asynchronous motor is simple and reliable for structure due to it, inexpensive, occupies absolute advantage in numerous motor driven field.But in large capacity motor field, synchronous motor possesses excellent power factor and efficiency characteristic, progressively replaces the range of application of asynchronous motor.
But enterprises network load rate is higher, capacity of short circuit is less, more weak with the connection of electric power system, its ability that is anti-interference or fault is also lower, and its system is more fragile, especially the isolated power plant for self-supply of Enterprise Construction, and its situation is more severe.Motor starting problem is an important threat of system vulnerability: asynchronous motor starting, the step-out of synchronous motor, synchronizing, asynchronous to restart etc. all can impact internal electric network, cause voltage and frequency decrease, other high-tension motor loads in same electrical network may therefore stall, production efficiency significantly reduces, defect ware rate significantly rises, and a large amount of load can be caused to trip, cause great economic loss time serious.
The rated power of axial flow compressor can reach 4000kW ~ 80000kW, and motor adopts 10kV Power supply usually.According to 4.2 regulation: 20kV and following three phase supply voltage deviation limit value in GB " quality of power supply supply power voltage deviation " GB2325-2008 be standard value ± 7%.Therefore, voltage drop when how to be started by axial flow compressor is limited within-7%, is the core requirement that maintaining enterprise internal electric network is stable.
Industrial large-scale, drive motor to Large Copacity direction high speed development, industrial equipment unit manufacturing capacity also improves day by day, and in Large Copacity field, asynchronous motor is progressively substituted by synchronous motor.The development of power electronic technology and automatic control technology also serves impetus to motor to Large Copacity future development.
Although motor is also optimized along with various performance parameter to Large Copacity future development ground, asynchronous motor simultaneously, but cannot be well solved in the low power factor problem and low starting torque problem of starting moment.And synchronous motor often can only rely on and carries damping winding, adopt the start mode identical with asynchronous motor, there is same problem.
Generally, power factor during motor across-the-line starting may be low to less than 0.4, and perceptual starting current is up to 6 ~ 8 times of rated current, and bring huge load or burden without work to impact to undoubtedly fragile electrical network, its result caused is well imagined.This characteristic is that the structure of motor determines, can not change.
At present the motor of axial flow compressor be have employed and a kind ofly solid-stately fallen benefit soft-start mode, within perceptual starting current can being restricted to 1.5 ~ 2 times of rated current, and adopt the method for reactive power compensation to improve power factor during motor starting, but this mode there are the following problems:
(1) rated capacity of device must be greater than the rated capacity of motor, and utilization ratio of device is low;
(2) started when switching to rated voltage, there is secondary pulse electric current;
No. (3) one times switch cubicle quantity is more, secondary connection and interlocking complexity;
(4) motor starting torque T is directly proportional to the quadratic relationship of starting voltage U, and Driving Torque declines to a great extent;
(5) when being applied to synchronous motor asynchronous starting, damping winding only can be utilized to provide starting torque, and starting performance is starkly lower than asynchronous motor, also can produce motor synchronizing and impact when pulling in;
(6) each prestart is longer for precharge time, and the interval time between double starting is longer.
In addition, for needing the load running speed governing, the industrial scheme also using transducer drive, but in this applications, the rated capacity of frequency converter must be greater than the capacity of motor.
For the motor of axial flow compressor, the requirement of voltage drop when its starting will meet starting, and can change because of the difference of stator blade aperture when starting due to load, its start mode can utilize these features to specialize in solution.
Summary of the invention
The object of the present invention is to provide a kind of variable frequency soft start system and method thereof of axial flow compressor, solve current axial flow compressor start mode, starting current is excessive, and starting torque is too small, cranking performance rating is low, causes line voltage to decline excessive, affects the problem of power network safety operation.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of variable frequency soft start system of axial flow compressor, comprise the 1# electric power incoming line cabinet, 2# electric power incoming line cabinet, bus PT cabinet, variable frequency power supply cabinet and the power frequency operation cabinet that are all connected to bus, also comprise the frequency conversion connecting cabinet and varying frequency starting cabinet that are all connected to by-pass, wherein power frequency operation cabinet is connected to the motor of axial flow compressor, described variable frequency power supply cabinet connects frequency conversion connecting cabinet after vector frequency converter, and varying frequency starting cabinet is connected to the motor of axial flow compressor;
Described 1# electric power incoming line cabinet and the parallel connection of 2# electric power incoming line cabinet provide power supply and for subsequent use each other, described bus PT cabinet detects and measures the magnitude of voltage that bus runs, described variable frequency power supply cabinet is vector frequency converter input power, described power frequency operation cabinet provides the power supply of the public electric wire net under normal table running status to the motor of axial flow compressor, power frequency operation is provided with the asynchronous switch-on point for closing a floodgate when vector frequency converter output voltage and public electric wire net Complete Synchronization cashier's office in a shop, described frequency conversion connecting cabinet connected vector frequency converter and varying frequency starting cabinet, for overhauling isolation, described varying frequency starting cabinet exports to the power supply of motor for turning on and off vector frequency converter.
Further, fault arc extinguishing tripgear is provided with in described varying frequency starting cabinet, for tripping rapidly when the motor of axial flow compressor breaks down.
A variable frequency soft start method for axial flow compressor, comprises the following steps:
Step one, remains on minimum aperture by stator blade, according to bearing power and the speed curves of axial flow compressor, calculates the minimum starting power of axial flow compressor;
Step 2, is chosen as the minimum starting power slightly larger than this axial flow compressor, is limited in rated current by the starting current of axial flow compressor by vector type frequency converter by the rated power of vector type frequency converter;
Step 3, be that axial flow compressor is powered through vector type frequency converter, when axial flow compressor is close to rated speed, same line voltage is gathered respectively from the input of vector type frequency converter and output, vector type frequency converter, according to the automatic regulation output voltage of amplitude, frequency and phase place, makes the amplitude of vector type frequency converter and public electric wire net, frequency and phase place accurate synchronization;
Step 4, after synchronous, by parallel with public electric wire net for the output of vector type frequency converter, take over seamlessly public electric wire net by the power supply of motor and powers, complete the variable frequency soft start of axial flow compressor.
Further, the starting current of described axial flow compressor is limited in rated current by vector type frequency converter.
Further, described stator blade remains on minimum aperture and remains on 30 °.
Compared with prior art, the invention has the beneficial effects as follows:
1, this System for Soft-starting simplifies a switch cubicle configuration quantity, in a switch cubicle configuration, on the normal basis running required switch cubicle quantity, the present invention increase only variable frequency power supply cabinet, frequency conversion switching cabinet, varying frequency starting cabinet totally 3 switch cubicles, and configuration is simple, and main electrical scheme is reliable; Simplify secondary connection and interlocking, in secondary connection, except varying frequency starting cabinet and power frequency operation cabinet need interlocked control combined floodgate, separating brake, rest switch cabinet only needs cabinet internal wiring, does not need to reciprocal interlock, and secondary connection is significantly simplified, improve reliability, reduce quantities.
2, this soft-starting method can produce maximum starting torque with minimum starting current when starting, avoid causing secondary current to impact to axial flow compressor, reduce the capacity of starting device, promote the starting performance of synchronous motor, realize voltage drop during motor starting to be limited within-7%, ensure that the useful life of whole axial flow compressor, the impact that the starting significantly reducing axial flow compressor produces electrical network.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the variable frequency soft start system of a kind of axial flow compressor of the present invention.
Fig. 2 is the schematic flow sheet of the variable frequency soft start method of a kind of axial flow compressor of the present invention.
Fig. 3 is the speed power curve schematic diagram of a variable frequency soft start method specific embodiment Axial-Flow compressor of a kind of axial flow compressor of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows an embodiment of the variable frequency soft start system of a kind of axial flow compressor of the present invention: a kind of variable frequency soft start system of axial flow compressor, comprise the 1# electric power incoming line cabinet 1AH being all connected to bus, 2# electric power incoming line cabinet 2AH, bus PT cabinet 3AH, variable frequency power supply cabinet 4AH and power frequency operation cabinet 5AH, also comprise the frequency conversion connecting cabinet 6AH and varying frequency starting cabinet 7AH that are all connected to by-pass, wherein power frequency operation cabinet 5AH is connected to the motor of axial flow compressor, described variable frequency power supply cabinet 4AH connects frequency conversion connecting cabinet 6AH after vector frequency converter, varying frequency starting cabinet 7AH is connected to the motor of axial flow compressor, described 1# electric power incoming line cabinet 1AH and 2# electric power incoming line cabinet 2AH parallel connection provide power supply and for subsequent use each other, described bus PT cabinet 3AH detects and measures the magnitude of voltage that bus runs, described variable frequency power supply cabinet 4AH is vector frequency converter input power, described power frequency operation cabinet 5AH provides the power supply of the public electric wire net under normal table running status to the motor of axial flow compressor, power frequency operation cabinet 5AH is provided with the asynchronous switch-on point for closing a floodgate when vector frequency converter output voltage and public electric wire net Complete Synchronization, described frequency conversion connecting cabinet 6AH connected vector frequency converter and varying frequency starting cabinet 7AH, for overhauling isolation, described varying frequency starting cabinet 7AH exports to the power supply of motor for turning on and off vector frequency converter.
According to another embodiment of the variable frequency soft start system of a kind of axial flow compressor of the present invention, in described varying frequency starting cabinet 7AH, be provided with fault arc extinguishing tripgear, for tripping rapidly when the motor of axial flow compressor breaks down.
Fig. 2 shows an embodiment of the variable frequency soft start method of a kind of axial flow compressor of the present invention: a kind of variable frequency soft start method of axial flow compressor, comprises the following steps:
Step one, remains on minimum aperture by stator blade, according to bearing power and the speed curves of axial flow compressor, calculates the minimum starting power of axial flow compressor;
Step 2, is chosen as the minimum starting power slightly larger than this axial flow compressor, is limited in rated current by the starting current of axial flow compressor by vector type frequency converter by the rated power of vector type frequency converter;
Step 3, be that axial flow compressor is powered through vector type frequency converter, when axial flow compressor is close to rated speed, same line voltage is gathered respectively from the input of vector type frequency converter and output, vector type frequency converter, according to the automatic regulation output voltage of amplitude, frequency and phase place, makes the amplitude of vector type frequency converter and public electric wire net, frequency and phase place accurate synchronization;
Step 4, after synchronous, by parallel with public electric wire net for the output of vector type frequency converter, take over seamlessly public electric wire net by the power supply of motor and powers, complete the variable frequency soft start of axial flow compressor.
The variable frequency soft start method of axial flow compressor shown in Fig. 2 can realize on the basis of the variable frequency soft start system of axial flow compressor shown in Fig. 1.
According to another embodiment of the variable frequency soft start method of a kind of axial flow compressor of the present invention, the starting current of described axial flow compressor is limited in rated current by vector type frequency converter.
According to another embodiment of the variable frequency soft start method of a kind of axial flow compressor of the present invention, described stator blade remains on minimum aperture and remains on 30 °.
Be illustrated with certain project example below, a certain object axial flow compressor nominal parameter is as follows:
Performance data and the curve of this axial flow compressor are as follows:
Fig. 3 is the speed power curve schematic diagram of this project Axial-Flow compressor.
The variable frequency soft start method of axial flow compressor is as follows:
1) rated power of variable frequency soft start is chosen.
From above-mentioned data drawing list, this axial flow compressor is when minimum stator blade aperture is 30 °, and minimum aperture power is 22065.38kW.The rated power of adjustable speed soft starter selects the nargin of consideration 5%, elects 23000kW as, is only 35% of axial flow compressor rated power.
Vector frequency converter, in starting process, under maintenance electric current is no more than the condition of frequency converter rated current, can export with nominal torque:
The requirement of any starting torque under minimum aperture can be met, and axial flow compressor can be made to reach rated speed smoothly.
2) prepare before axial flow compressor.
The variable frequency soft start system schematic of the axial flow compressor shown in composition graphs 1, starts before starting, stator blade aperture is closed minimum angles 30 °, and remain unchanged.1# electric power incoming line cabinet 1AH (or 2# electric power incoming line cabinet 2AH), bus PT cabinet 3AH, variable frequency power supply cabinet 4AH and frequency conversion connecting cabinet 6AH are in closing position, and power frequency operation cabinet 5AH and varying frequency starting cabinet 7AH is in open position.
3) operation of Variable Frequency Soft Starting.
Button on operation frequency converter, send " starting " order, varying frequency starting cabinet 7AH closes a floodgate, and vector frequency converter starts to export frequency conversion voltage, makes motor start raising speed, and in the process, output current of frequency converter is no more than frequency converter rated current.
4) automatic accurate synchronous concatenation and power switching operations.
Signal and the waveform such as voltage, electric current of the automatic Gather and input end of vector frequency converter and output, after motor speed reaches rated speed, start and judge the accurate same period, by the automatic regulation output magnitude of voltage of vector frequency converter, after making output end voltage and input terminal voltage reach condition accurate same period, order that frequency converter sends " the switching same period ", power frequency operation cabinet 5AH closes a floodgate.Close a floodgate successfully, send into vector frequency converter by the closing position signal of power frequency operation cabinet 5AH, chain varying frequency starting cabinet 7AH to be tripped.
Aforesaid operations completes, and shows to start to complete.Stator blade aperture can be regulated, increase load.
5) actual effect.
Through actual measurement, line voltage when this axial flow compressor starts declines and is only-4.7%, and starting process is level and smooth without impacting, and motor indices is all in nominal value range.
6) points for attention.
Should be noted: when first start; in order to prevent protective device misoperation; motor protecting device need be exited; and record Variable Frequency Soft Starting required time Δ t (s); and Δ t+0.5 (s) is inputted in motor differential protection, as the setting value of " starting time ".In subsequent startup operation, motor differential protection can be dropped into.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and execution mode, these amendments and execution mode will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the distortion carried out building block and/or layout and improving, to those skilled in the art, other purposes also will be obvious.
Claims (5)
1. the variable frequency soft start system of an axial flow compressor, it is characterized in that: comprise the 1# electric power incoming line cabinet (1AH) being all connected to bus, 2# electric power incoming line cabinet (2AH), bus PT cabinet (3AH), variable frequency power supply cabinet (4AH) and power frequency operation cabinet (5AH), also comprise the frequency conversion connecting cabinet (6AH) and varying frequency starting cabinet (7AH) that are all connected to by-pass, wherein power frequency operation cabinet (5AH) is connected to the motor of axial flow compressor, described variable frequency power supply cabinet (4AH) connects frequency conversion connecting cabinet (6AH) after vector frequency converter, varying frequency starting cabinet (7AH) is connected to the motor of axial flow compressor,
Described 1# electric power incoming line cabinet (1AH) and 2# electric power incoming line cabinet (2AH) parallel connection provide power supply and for subsequent use each other, the magnitude of voltage that bus runs is detected and measured to described bus PT cabinet (3AH), described variable frequency power supply cabinet (4AH) is vector frequency converter input power, described power frequency operation cabinet (5AH) provides the power supply of the public electric wire net under normal table running status to the motor of axial flow compressor, power frequency operation cabinet (5AH) is provided with the asynchronous switch-on point for closing a floodgate when vector frequency converter output voltage and public electric wire net Complete Synchronization, described frequency conversion connecting cabinet (6AH) connected vector frequency converter and varying frequency starting cabinet (7AH), for overhauling isolation, described varying frequency starting cabinet (7AH) exports to the power supply of motor for turning on and off vector frequency converter.
2. the variable frequency soft start system of a kind of axial flow compressor according to claim 1, it is characterized in that: in described varying frequency starting cabinet (7AH), be provided with fault arc extinguishing tripgear, for tripping rapidly when the motor of axial flow compressor breaks down.
3. a variable frequency soft start method for axial flow compressor, is characterized in that comprising the following steps:
Step one, remains on minimum aperture by stator blade, according to bearing power and the speed curves of axial flow compressor, calculates the minimum starting power of axial flow compressor;
Step 2, is chosen as the minimum starting power slightly larger than this axial flow compressor, is limited in rated current by the starting current of axial flow compressor by vector type frequency converter by the rated power of vector type frequency converter;
Step 3, be that axial flow compressor is powered through vector type frequency converter, when axial flow compressor is close to rated speed, same line voltage is gathered respectively from the input of vector type frequency converter and output, vector type frequency converter, according to the automatic regulation output voltage of amplitude, frequency and phase place, makes the amplitude of vector type frequency converter and public electric wire net, frequency and phase place accurate synchronization;
Step 4, after synchronous, by parallel with public electric wire net for the output of vector type frequency converter, take over seamlessly public electric wire net by the power supply of motor and powers, complete the variable frequency soft start of axial flow compressor.
4. the variable frequency soft start method of a kind of axial flow compressor according to claim 3, is characterized in that: the starting current of described axial flow compressor is limited in rated current by vector type frequency converter.
5. the variable frequency soft start method of a kind of axial flow compressor according to claim 3, is characterized in that: described stator blade remains on minimum aperture and remains on 30 °.
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| CN201510961219.2A CN105391348B (en) | 2015-12-18 | 2015-12-18 | A kind of variable frequency soft start system and method for axial flow compressor |
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| CN201510961219.2A CN105391348B (en) | 2015-12-18 | 2015-12-18 | A kind of variable frequency soft start system and method for axial flow compressor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640724A (en) * | 2017-03-10 | 2017-05-10 | 成都成发科能动力工程有限公司 | Variable-frequency multi-split starting method for large-size axial flow compressor |
| CN111786387A (en) * | 2020-07-28 | 2020-10-16 | 山东核电有限公司 | Power supply method for electric generating set of reactor coolant pump of AP1000 nuclear power unit |
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| CN201025697Y (en) * | 2007-03-20 | 2008-02-20 | 西安陕鼓动力股份有限公司 | A soft start control circuit for jigger electromotor of axis flow compressor |
| CN202026265U (en) * | 2011-03-14 | 2011-11-02 | 襄樊大力电工有限公司 | High-voltage variable-frequency soft start system |
| CN203027169U (en) * | 2012-12-27 | 2013-06-26 | 成都成发科能动力工程有限公司 | Dropping-compensation solid soft starting device for axial-flow compressor |
| JP2014027734A (en) * | 2012-07-25 | 2014-02-06 | Daikin Ind Ltd | Motor drive device |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201025697Y (en) * | 2007-03-20 | 2008-02-20 | 西安陕鼓动力股份有限公司 | A soft start control circuit for jigger electromotor of axis flow compressor |
| CN202026265U (en) * | 2011-03-14 | 2011-11-02 | 襄樊大力电工有限公司 | High-voltage variable-frequency soft start system |
| JP2014027734A (en) * | 2012-07-25 | 2014-02-06 | Daikin Ind Ltd | Motor drive device |
| CN203027169U (en) * | 2012-12-27 | 2013-06-26 | 成都成发科能动力工程有限公司 | Dropping-compensation solid soft starting device for axial-flow compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106640724A (en) * | 2017-03-10 | 2017-05-10 | 成都成发科能动力工程有限公司 | Variable-frequency multi-split starting method for large-size axial flow compressor |
| CN111786387A (en) * | 2020-07-28 | 2020-10-16 | 山东核电有限公司 | Power supply method for electric generating set of reactor coolant pump of AP1000 nuclear power unit |
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| CN105391348B (en) | 2018-03-27 |
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