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Implicit Z-bus distribution power flow method may encounter divergence problems when applied to distribution systems with distributed generators (DGs) modeled as P-V nodes. In this paper, analysis of divergence problems associated with the Implicit Z-bus method is performed. We illustrate the derived analytical results to conduct divergence analysis on the IEEE 13-bus, and a practical 1101-node distribution...
Power flow analysis of distribution systems needs special methods to handle the distributed generators (DGs) modeled as P-V nodes. However, many existing power flow methods often fail to solve this problem. This paper presents a homotopy-enhanced numerical method for power flow analysis of distribution networks with DGs modeled as P-V nodes. The method is applicable to general distribution networks...
An improved Fast Decoupled Load Flow calculation method for distribution systems with high R/X ratio is proposed. This method is based on a coordinate transformation in Y-matrix for Jacobian matrix in the load flow method. The biggest advantage of so-called Fast Decoupled Load Flow(FDLF) method over the conventional Newton-Raphson method is the short computation time for large power systems which...
The widespread shortage of electricity occurred by the Great East Japan Earthquake occurred in March of 2011 has made us keenly aware of the need for households, offices, factories, and local governments to maintain their own power sources that are not completely dependent on electric power companies. In constructing such power sources, locally generated and consumed renewable energy from solar and...
For construction of smart grid with optimal operations, analytical studies for distribution systems are important, and advanced method which is applicable to any power systems is required. Today, Newton-Raphson method is utilized for a lot of power flow analysis. However, since R/X ratios of lines are relatively high in distribution systems, it is said that the convergence characteristics of Newton-Raphson...
Installation of the photovoltaic power system on the roof of houses is increasing rapidly. The photovoltaic power system has two typical problems, one is large power output change depending on climate change, and the other is over voltage in distribution line due to reverse power flow. These problems will be remarkable subjects for large amount of installation of photovoltaic power system in near...
A new type of micro-grid called “Electricity Cluster-oriented Network” is proposed. The proposed Electricity Cluster-Oriented Network is the aggregation of the loosely-coupled, autonomous and independent local network called “cluster”, and the expansion in the scale is easily achieved as the additional power demand arises. This approach will be possible to hold down initial investment. Mathematical...
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