Abstract
The increasing share of distributed renewable energy resources may lead voltage violation problems in low-voltage (LV) network. However, a number of smart grid solutions are developed, only very limited number of solutions are being implemented in real field. Therefore, in this study, on-load tap changer based smart solution is verified using a real rural LV network in Slovenia. The field trial revealed that redundancy and cyber security are the main concerns for distribution system operator, which are addressed in this field trial.
Highlights
As countries try to achieve their green energy related targets, the share of distributed renewable energy resources (DRES) in low-voltage (LV) networks increases
The field trial revealed that redundancy and cyber security are the main concerns for distribution system operator, which are addressed in this field trial
The proposed control is embedded in a computer called TU/e PC that is connected to the supervisory control and data acquisition (SCADA) system of Distribution system operators (DSOs) using open platform communications (OPC) unified architecture (UA) protocol
Summary
As countries try to achieve their green energy related targets, the share of distributed renewable energy resources (DRES) in low-voltage (LV) networks increases. A control concept called overlaying control for OLTC is proposed to solve the simultaneous overvoltage and undervoltage problem that occur in different feeders. The overlaying control acquires the real-time voltage measurements from the end busses of all feeders, and coordinates OLTC and power injection of solar photovoltaics (PVs) to maintain the voltages within EN50160 limits. The proposed control is verified using a real rural LV network in Slovenia. The following features are identified as requirements in order to test the proposed control in a real field trial, which are: cyber security and redundancy for communication failures. The redundancy in case of communication failures is provided by coordinating the local control of transformer and the proposed overlaying control.
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