Sucker Rod Pumps Effected on Generators

?????????????????????????????????????????????????????????????? Attached ????

Without seeing the attached(?) files my guess is that the total load is too closely matched to the gen set ratings. Widely varying cyclical loads such as the sucker pumps can cause hunting in governors, this problem is further aggravated by the harmonics caused by reciprocating engines, and to make matters worse there is the possibility that the random nature of the varying pump loads can cause unanticipated peaks and valleys in the overall demand when they are aligned.

The goal is to increase the robustness of the power supply. Easiest solution, not cheapest, is to add generation, but finding an expert in governor tuning may provide some relief.

Sucker pump is reciprocating.So add more than one pump to the generator.So that current flow will be near uniform.Also correct power factor.Flywheel of engine to be made heavy.

The big oil pumps we have here tend to have a heavy load for part of their pump cycle then produce a regenerative feedback though another part so given that type of load cycling its doubtful that you will ever completely eliminate the frequency variances completely unless your generator system is built to be many many times bigger than what the overall load it is supplying.

I suspect that due to the slightly different loads on each well the induction motors will each have a slight speed variance of +- an RPM or two from lightest loaded to heaviest loaded which over time will tend to create times where the majority of the pumps are all drawing power and then returning returning power at or near the same time.

To me I would not worry about a few Hz variance if its not affecting the overall operation of the system unless the load imbalances is at time pushing the generators well beyond its designed peak momentary capacity to the point of overheating the unit.

In one of my earlier plant experiences, I had a similar problem. My generator literally shifted by about 15 degrees - when a reciprocating pump was run on it. We strengthened the generator foundation by increasing the number of AVM Pads (from 8 x 800 kg pads to 12 x 1200 kg pads). And... the vibrations stopped.

I have sent you a email...

but unitl you reply maybe you need to check the braking resistors on the units, find out how much it would be to replace the existing motors with higher efficiency ones and get your pumps work opposed to each other, that is, one on the downstroke while the other is on the up stroke.

Your Hz fluaction could be a problem with the gen set(s) itself, get it checked and ensure the output Hz & volts is correctly monitored.

As for the power station problems, depending on the amount of pumps you are using and if you have other demands on the system, you could be experiencing high level of harmonics, negative KVar's plus no pf correction or very little, however I would like to discuss this separate from CR4, so I comply with the rules of the forum