01-变频电潜泵相似理论VSD-Theory-Affinity-Laws.课件.ppt
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- 01 变频 电潜泵 相似 理论 VSD Theory_Affinity Laws 课件
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1、REDA Production System Variable Speed Drive 2 / 33State of the Art Technology, High Performance,Reliable,Variable Speed DriveSWD Flux Vector VSD3 / 33What does the VSD do for us Provides constant torque through the entire speed range Can be used manually to set the V/Hz ratio for specific applicatio
2、ns (Base Speed) Provides reduced starting capabilities (Soft Start) Optimizes the output of the well (Avoids cycling of the well and equipment)4 / 33Why use a VSD in your application?Flexibility to the system: Provide lightning protection for the downhole equipment Eliminate the need for chokes in t
3、he system Provide inherent soft start no inrush currents. Protect the downhole equipment from pump off Enable remote operation/automation Enable smooth response to torque changes5 / 33 Slow acceleration ramp ultimately reduces pump wear, prevents sand infiltration, to increase run life Reduces downt
4、ime and maintenance AND! Speedstar 2000 can catch a back-spinning motor! (patent pending) Speedstar 2000 can provide Tracking underload. Why use a VSD in your application?6 / 33VSD Output to Motor The Speedstar 2000 controls the output and to the motor by:Changing the input AC signal to DC signal,Ch
5、opping the resulting DC signal, and finally,Varying the output voltage and frequency to the motor. By varying the voltage and frequency to the motor, we are changing what is called the V/Hertz ratio.7 / 33The increased speed causes the pump to put out more head and flow and, in an effort to obey the
6、 laws of physics, the brake horsepower required to do this task also increases.We can predict the change in pump performance with affinity laws.Sizing a VSD application is then a matter of matching the pump and motor at the speed of interest.Summary8 / 33V VS SD DD Di i s sc co on nn ne ec ct t S St
7、 te ep p- -U Up pT Tr ra an ns sf fo or rm m e er rJ J B Bo ox x S St te ep p- -D Do ow w n nT Tr ra an ns sf fo or rm m e er r B Ba an nk kVSD ApplicationFlowHZFlow6060HZHead60HeadHZHZ602BHP60BHPHZ60HZ3MHP60MHPHZ60HZIf we know the pump performance at 60 Hz, we can correct it toanother frequency by
8、the affinity laws: (1)If we know the motor 60 Hz nameplate rating, we can calculate theoutput horsepower rating at any other frequency with: (1)Useful Equations(1) If we prefer to work with 50 Hz as a base, we can substitute in50 in place of 60 everywhere it appears in the equations.10 / 3360MHP60BH
9、PHZ602HZ6060MHP60BHPUseful EquationsIf we know the pump BHP at 60 Hz and we know what is themaximum frequency we desire to run at, we can determinethe minimum permissible 60 Hz motor HP rating as:If we know the pump BHP at 60 Hz and we know what our motorsize is at 60 Hz, we can calculate the maximu
10、m allowablefrequency before overloading the motor as:11 / 33% Load =BHP60 MHP6060HZ2VoltsVoltsHz60Useful EquationsIf we know the voltage at 60 Hz, we can calculate it at anotherfrequency as:If we know the pump BHP at 60 Hz and the motor rated Hp at60 Hz, we can determine the motor load at any freque
11、ncy as:6012 / 33Volts xKVAAmps x1.7321000Drive Output KVA = KVA x ?V480VUseful EquationsAt any frequency, if we know the volts and amps, we can calculate the KVA as:480If we know the drive KVA rating at one input voltage, we canconvert it to another input voltage as:13 / 33Hp LimitHzHP LimitHz6060HZ
12、6060SHP60BHPUseful EquationsIf we know the pump shaft HP rating at 60 Hz, we can convert itto another frequency as:If we know the pump shaft HP rating at 60 Hz and the pump BHPrequirement at 60 Hz, we can determine the maximum frequencyallowable before we exceed the shaft capability as:VSD APPLICATI
13、ONSAFFINITY LAWS15 / 33VSD ApplicationsThe VSD allows a great deal of flexibility in applying pumping equipment to a well.Look at a variable speed pump curve:16 / 33HeadFeetHPMotorLoad010002000Capacity - Barrels per Day300040005000600070006500500150025003500450055007500102030405060702.001.003.00Reda
14、 Single Stage Pump Performance CurveGN4000 540 Series Pump - Variable FrequencyHead CapacityPump Only Load70 Hz65 Hz60 Hz55 Hz50 Hz70 Hz65 Hz60 Hz55 Hz50 Hz17 / 33Remember that the SPS motor horsepower output rating will increase directly with the ratio of the frequency.What assumption is this based
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