I am basically from power systems area and currently looking from control's perspective to mitigate under-voltage issues in MV distribution feeder when there's a sudden increase in the load at some bus/node. I am planning to work on battery storage control to resolve this issue but couldn't found any good control technique which can 100% guarantee the correction of under-voltage issue when a highly fluctuating load is connected on a bus in MV feeder. (The load is highly fluctuating in terms of magnitude and it stays almost the same for couple of minutes at least; the load levels are 0, 350, 700 or 1000 kW and it is changing its levels after few minutes.)
(P.S. What I am looking for is a technique (open loop or feedback) which can command battery system to discharge power (active or reactive) proportional to the voltage deviation, which should result in complete mitigation of the voltage deviation. Any guidance in this regard would be appreciated).
Regards
Hi Waqas, can you show us the basic differential equations for the under-voltage issues in MV distribution feeder?
From the control problem perspective, it seems that the "highly fluctuating load" is the culprit. Once your control system has robustly compensated for this load, it will be able to correct the voltage.
Yew-Chung Chak Thank you for your feedback. I need a clarification to make: the load is highly fluctuating in terms of magnitude and it stays almost the same for couple of minutes at least; the load levels are 0, 350, 700 or 1000 kW and it is changing its levels after few minutes.
Secondly, I don't have differential equations of the control since I was only implementing some simple steady state local bus "voltage deviation based control" to charge/discharge the ESS.
I want to implement a control technique which can discharge battery proportional to the voltage deviation on the local bus, and that relationship I don't have right now. Also, I want to analyse the transient impact of that control on voltage at that location.
I would highly appreciate suggestions!
Wagas, I would suggest you have a look on this paper as it might give you some feedback/answers on your question.
Article Adaptive Decentralized Control of Residential Storage in PV-...
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