Abstract
Electric power distribution system are usually unbalance. Therefore, a power flow method that can handle the three-phase configuration of the power system is needed so that the system planning and operation can properly be carried out. In the case of three-phase distribution system power flow analysis, for each system bus (except for substation bus), the voltage magnitude and angle of the three phases must be calculated. These calculations are carried out under certain loading conditions. After these voltages have been calculated, the electric power flows and losses in the distribution lines, and the substation power can also be determined. This paper proposes a new technique for three-phase distribution system power flow analysis using sequence components. The new formulation for the power flow problem in terms of sequence components is also proposed and developed in this paper. The application of sequence components has the advantage that the size of the problem can effectively be reduced, and solution to the power flow problem will be easier to find. Case study using a representative distribution test system confirms the validity of the proposed method where comparative studies between the proposed (i.e. sequence components based) method and the phase components based method are carried out.
Highlights
The single-phase power flow algorithm assumes that the unbalance in an electric power system is small and can be neglected so that the system can be considered to be balanced
Power flow is an important tool in operational study and planning of electric power systems
There are many cases where system unbalance can no longer be ignored, and three-phase power flow algorithm has to be used in the analysis
Summary
Power flow (or load flow) is an important tool in operational study and planning of electric power systems. A three-phase power flow method that can be used on an unbalanced system is needed so that the system can be analyzed. Several researchers have developed some interesting three-phase power flow algorithms to analyze the unbalanced distribution systems. These algorithms can be grouped into two categories: (i) algorithms that use the Newton-Raphson iteration scheme [1]-[5]; and (ii) algorithms that utilize the radial structure of the power distribution system (forward/backward sweeping techniques) [6]-[11]. The present work investigates the three-phase distribution system load flow (DSLF) method using sequence components. Comparative studies between the proposed method and the phase components based method are carried out These comparative studies are conducted to validate the proposed power flow method using sequence components
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