Abstract
Abstract Having an inter-tie between low/medium voltage grid and distributed generation (DG), both exposes to power quality (PQ) problems created by each other. This paper addresses various PQ problems arise due to integration of DG with grid. The major PQ problems are due to unbalanced and non-linear load connected at DG, unbalanced voltage variations on transmission line and unbalanced grid voltages which severely affect the performance of the system. To mitigate the above mentioned PQ problems, a novel integrated control of distribution static shunt compensator (DSTATCOM) is presented in this paper. DSTATCOM control helps in reducing the unbalance factor of PCC voltage. It also eliminates harmonics from line currents and makes them balanced. Moreover, DSTATCOM supplies the reactive power required by the load locally and hence, grid need not to supply the reactive power. To show the efficacy of the proposed controller, several operating conditions are considered and verified through simulation using MATLAB/SIMULINK.
Highlights
The continuously increasing energy demand, along with the necessity of higher reliability requirements, are driving the modern power systems towards distributed generation (DG) as an alternative source
We further extended the work presented in [11] for the regulation of PCC voltage due to unbalanced grid voltages and unbalanced loads connected at transmission line between grid and DG
Having an inter-tie between grid and DG, both exposes to power quality (PQ) problems created by each other such as current harmonics, unbalanced load and voltage variations
Summary
The continuously increasing energy demand, along with the necessity of higher reliability requirements, are driving the modern power systems towards distributed generation (DG) as an alternative source. The load imbalance causes oscillatory torque leading to mechanical stress and malfunctions of sensitive equipment Another major issue associated with DG connection is the voltage variation on transmission line connected between grid and DG. In [10], authors used DSTATCOM to mitigate the voltage fluctuations at microgrid-bus (i.e., PCC) due to unbalanced load and reactive power demand. By controlling those two inverters, authors claimed the enhancement of both quality of power within microgrid and quality of current flowing between microgrid and utility system Such systems may not be cost effective and control will be complex in case of multiple DGs. the important control configuration i.e., control of DC-link voltage of micro-source is missing in the above mentioned literature. DSTATCOM control is developed in such a fashion that it should provide reactive power demand of DG-side load locally and neither inverter nor grid should supply the reactive power
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