Journal article
Efficient Control of Active Transformers for Increasing the PV Hosting Capacity of LV Grids
Department of Electrical Engineering, Technical University of Denmark1
Center for Electric Power and Energy, Centers, Technical University of Denmark2
Distributed Energy Resources, Center for Electric Power and Energy, Centers, Technical University of Denmark3
Fraunhofer Institute for Wind Energy and Energy System Technology4
The increased penetration of grid-connected photovoltaic (PV) systems in low voltage (LV) grids creates concerns about overvoltage in these grids. The proposed methods to prevent overvoltage, such as reactive power absorption by PV inverters and active power management of customers, focus on decreasing the voltage rise along LV feeders, and the potential of active medium voltage to low voltage (MV/LV) transformers for overvoltage prevention has not been thoroughly investigated.
This paper presents the application of active MV/LV transformers for increasing the PV hosting capacity of LV grids. The potential interferences between the operation of active transformers and the reactive power absorption by PV inverters are investigated, and a voltage droop control approach is proposed for the efficient control of these transformers during high PV generation periods.
The proposed method can potentially increase the PV hosting capacity of the grid, while eliminating the need for a complex and centralized controller. The voltages of specific locations or the grid state estimations provide adequate data for adjustments of the droop parameters. The simulations and field test results associated with the implementation of the proposed method to a newly developed active LV grid with high PV penetration in Felsberg, Germany, confirm the efficiency of the proposed method.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2016 |
| Pages: | 270-277 |
| ISSN: | 15513203 and 19410050 |
| Types: | Journal article |
| DOI: | 10.1109/TII.2016.2619065 |
| ORCIDs: | Hashemi Toghroljerdi, Seyedmostafa and Østergaard, Jacob |
Active transformer High PV penetration Low Voltage Grid Reactive power management SDG 7 - Affordable and Clean Energy Voltage control
Absorption Felsberg Germany Informatics Inverters LV feeders Low voltage PV generation periods PV hosting capacity PV inverters Power generation Reactive power active power management active transformer control droop parameters grid overvoltage grid state estimations grid-connected photovoltaic systems high photovoltaic (PV) penetration invertors low-voltage (LV) grid low-voltage grids low-voltage transformers medium-voltage transformers overvoltage photovoltaic power systems power grids power transformers reactive power reactive power absorption reactive power management voltage control voltage droop control
