Is it sufficient enough to control the cuk converter (charge controller) to control the speed of an induction motor fed by a solar supply or should i control both the cuk converter and the inverter for the same.
Dear Srinivas, can you give some more details of your circuit please? I am not sure why you want have a separate CUk converter and inverter? Or is the inverter the device that generates the AC power for the induction motor? Induction motors are not very sensitive to applied voltage; they depend on the drive frequency.
If you have an induction motor that runs on less voltage than the PV system produces then you don't need a cuk convertor - a buck convertor will be adequate. I am also not convinced that cuk converters are that efficient. Generally the fewer the parts, the less loss and the more power comes out for a given input. Cuk convertors have twice as many parts as the buck convertor.
Hope you sort it out and get your system running!
Dear Tony, Since the input and output current of a cuk converter would not be pulsating as in the case of a buck-boost converter i hope a cuk converter would reduce the ripple current which in turn would reduce the ripple torque of the induction motor. Also i prefer a cuk converter because the induction motor is 0.5Hp (365 w - approx) machine which needs a boosted voltage from my solar PV panel with 200 W rating. Also i believe when i interleave the cuk converter which i use between the solar panel and the voltage source inverter i would be able to increase my current/power output fed to the induction motor. But since you say that a frequency control is preferable for an induction motor drive over the voltage control of speed of induction motor i would like to know the converter combinations that would best suit my application of speed control of higher power rated machine for the same PV input voltage of about 200W.
Dont' worry about ripple current in a half horsepower induction motor! It won't see any of it. The rotor has far, far too much rotational inertia.
Now there are some things to be concerned about when using induction motors. Most of these don't have high start torque. What sort of load are you driving? And, I am puzzled a bit that you want to drive a 365W motor from a 200W solar panel. It might not work!
What is the rated voltage of the motor? Is it a single phase motor? What sort of load is it driving? Rather than build or acquire a complicated inverter, I have a feeling that a second solar panel would be a far better investment.
Can you give some diagram of your arrangement please?
Best wishes!
Thank you for your valuable comments. If i use a 600W panel (200W x 3), will that be sufficient enough for driving a 0.5Hp machine. I prefer to use it in a pump application for irrigation.
Dear Srinivas,
I would recommend the following paper regarding the cuk converter and its control in PV systems.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6777339&isnumber=6936952
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering