Dear Researchers
How to do tuning of Kp and Ki values in closed loop A.C systems while using PLL , abc to dq or dq to abc transformation functions. Please can anybody explaining tuning of Kp and Ki values?
Start to set to zero the Ki parameter, then increase the Kp parameter till system start to be unstable. This gives you the maximum stable Kp parameter that must stay below an half of this value. Finally, increase progressively the Ki parameter, and decrease of the same amount the Kp. A precise description of a tuning is also known as the Ziegler Nichols tuning method.
There are various tuning approaches described by different authors and the literature is available online. The tuning parameters such as Kp and Ki also depends on the system and the nature of external disturbances.
For tuning reduce totally (least effect) the value of Kp and also Ki (large time constant). In this situation the control system should not regulate the motor based load variation. Now slowly increase the Kp (gain) and check the control action. While checking the controlling ability the external disturbances must be applied. The higher value of Kp will start oscillating. Now reduce the gain to have stable control. Generally the system should control without integral part also. If does not control then there is some other problem. The value of Ki may be selected to preferably lower value as described by tuning method. Actually for Ki tuning the response time of the system should be known.
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