Abstract
The paper deals with Power System State Estimation (PSSE) that plays essential role in modern dispatcher centres. The aim of the paper is to present results of original investigations on change of properties of PSSE when a symmetrical phase shifter is installed in a Power System (PS). The mentioned phase shifter is one of the types of phase shifters. Such the phase shifter is installed in the Polish Power System. In the paper, the following indices characterizing properties of PSSE are considered: the number of iterations in PSSE calculation, the conditionality of the solved equations and accuracy of estimation. The investigations are made using the IEEE 14-bus test system. The properties of PSSE are analysed when there is the phase shifter and when there is not such the device in PS for the polar and rectangular coordinate systems. The investigations are so organized to take into account possibly all space of states of PS. Results of the investigations show that there is noticeable change of the properties of PSSE as an effect of installation of the phase shifter in PS. In the paper, also such the cases are indicated, in which those changes are the smallest.DOI: http://dx.doi.org/10.5755/j01.eie.24.4.21473
Highlights
One of devices, which are utilized for power flow control in modern Power Systems (PSs), is a Phase Shifter (PhS)
The Power-System State Estimation (PSSE) is important part of the real-time PS modelling [5], which should ensure the reliable estimate of the PS state vector
The installation of PhSs in PS changes the conditions that must be taken into account designing SE calculation
Summary
One of devices, which are utilized for power flow control in modern Power Systems (PSs), is a Phase Shifter (PhS). Its characteristic feature is possibility of control of phase angles of voltages in PS. Changing the phase shift between the terminal voltages of a power line implies changes of the power flow through this line [1]–[3]. PhS changes power flows in PS, what can lead to elimination of undesirable power flows. Presence of PhS in PS should be taken into account in calculations made for this system, in particular, in State Estimation (SE) [4]. The Power-System State Estimation (PSSE) is important part of the real-time PS modelling [5], which should ensure the reliable estimate of the PS state vector
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