Tag Archives: power quality

2639–2652 T. Vinnal, H. Puusepp, N. Shabbir, L. Kütt and M. N. Iqbal
Case study of non-linear PV inverter devices attached to the LV distribution network
Abstract |

Case study of non-linear PV inverter devices attached to the LV distribution network

T. Vinnal, H. Puusepp, N. Shabbir, L. Kütt and M. N. Iqbal

Tallinn University of Technology, School of Engineering, Department of Electrical Power Engineering and Mechatronics, Ehitajate tee 5, EE19086 Tallinn, Estonia.

Abstract:

Every year, more and more solar power plants are connected to the grid, producing electricity in an environmentally sustainable manner. The increasing number of photovoltaic (PV) installations and their integration into the low voltage (LV) distribution network (DN) is having an impact in terms of power quality (PQ). For example, the voltage in the DN can sustain high distortion values. The impact of a PV installation on the LV network is analysed in this research. The field measurements were carried out over a 3-week period at a solar power plant with a total output power of 160 kW in an Estonian rural municipality. The measurement results provide the opportunity to look more closely at the effect of the solar power plant on the supply voltage of the LV DN. Parameters such as voltage variation within a one-minute period, the asymmetry of the voltages and the total harmonic distortion of the voltages are discussed here.

Key words:

, , , , , ,




553-562 M. Märss,, A. Annuk, A. Allik and J. Uiga
AC-link based new microgrid system for research of local power flow management
Abstract |
Full text PDF (884 KB)

AC-link based new microgrid system for research of local power flow management

M. Märss¹⋅²,*, A. Annuk¹, A. Allik¹ and J. Uiga¹

¹Institute of Technology, Estonian University of Life Sciences, Kreutzwaldi 56, EE51014 Tartu, Estonia 2Tallinn University of Technology, Department of Electrical Engineering, Ehitajate tee 5, EE19086 Tallinn, Estonia; *Correspondence: maido.marss@emu.ee

Abstract:

This paper gives an overview of a distributed energy technology laboratory, where diverse approaches are studied to effectively integrate distributed generation into power systems. The laboratory is equipped with small-scale power generation devices including wind turbine (3.5 kW), PV array (2.5 kW), synthetic energy generator (3.6 kW) and also batteries, ultra capacitor, programmable load (6.2 kW), weather station, power flow and power quality control and monitoring system. The laboratory is used for researching and applying energy-management technics to control energy storage and increasing power reliability and power quality in small-scale generation units. On-site measured data of power consumption and production can be linked to the laboratory and simulated online with synthetic energy generator and programmable load. It is also possible to scale the measured data and model systems with variable sizes. As a result the stability of variable systems can be tested with different storage capacities and load management techniques.

Key words:

, , , ,