What is it about?
This paper presents a generalized formulation to determine an optimal operating strategy and cost minimization scheme for an electronically weak-coupled MG. The major objective of the paper is to minimize the overall operating cost considering both the power system and the power electronics constraints in the two modes of the MG operation (connected with the grid and isolated modes).
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Why is it important?
The paper also presents steady state, fundamental-frequency models of power electronic converter/inverter systems for coupling DG units to the utility power grid based on Newton-Raphson and the developed models. A Matlab program is developed to represent the proposed algorithm. The program is tested in various network conditions and verified by applying it to a MG with three DG units from which one wind turbine generator connected with the system through AC/AC matrix converter and one photovoltaic panel connected with the system through two power electronic stages (DC/DC boost converter and DC/AC inverter) during the two modes of operations (on-grid and off-grid modes).
Perspectives
A three-step optimal operation approach is presented. Step 1 of the approach solves for the AC network based on a conventional OPF technique considering the regular OPF constraints of active power, reactive power, line flows, and bus voltage constraints while minimizing the overall cost. However Step 2 utilizes terminal quantities of each DG obtained from Step 1 and solves for the internal parameters/variables of the DG unit including those of the converter system and the prime source of the DG unit while making sure that the power electronic constraints are satisfied. If the power electronic constraints are not satisfied, so, step 3 has to be activated to force them even, if the optimal parameter costs have to be scarified.
sahar kaddah
Mansoura University
Read the Original
This page is a summary of: Overall cost minimization of weakly coupled MicroGrids, International Transactions on Electrical Energy Systems, December 2013, Wiley,
DOI: 10.1002/etep.1857.
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