Abstract
ABSTRACTOptimal Reactive Power Dispatch (ORPD) plays an important role for the secure and reliable operation of power systems. The main purpose of ORPD is to find the settings of control variables such as voltage rating of generators, reactive power injection of VAr compensators and tap ratios of the tap setting transformers in order to minimize the total active power losses of the network while satisfying a given set of constraints. In this paper, Flexible AC Transmission System (FACTS) controllers such as Static Var Compensator (SVC), Thyristor Controlled Series Capacitor (TCSC) and Thyristor Controlled Phase Shifting Transformer (TCPST) are considered in addition with the conventional ORPD control variables for additional active power loss minimization. The whole ORPD problem is considered as a non-linear multi-modal optimization problem. Harmony search algorithm is a recent meta-heuristic algorithm which mimics the musician’s improvization process. In this paper, two versions of harmony search algorithm, namely Basic Harmony Search Algorithm (HSA) and Improved Harmony Search Algorithm (IHSA) are applied to solve conventional ORPD, as well as ORPD considering FACTS devices. Studies on the proposed algorithm are carried out on IEEE 14 and 57 bus systems. Comparison of simulation results reveals the effectiveness of proposed algorithms over other well-established population-based optimization techniques.
Highlights
The optimal power flow (OPF) problem is a major and powerful tool for operating and planning of power systems first formulated by Carpentier in 1960s [1]
The simultaneous application of three type Flexible AC Transmission System (FACTS) devices reduces the system active power loss to 12.065MW for Improved Harmony Search Algorithm (IHSA) and 12.198MW for Harmony Search Algorithm (HSA) which is the biggest reduction of active power loss in comparison to that of results obtained by solving conventional optimal reactive power dispatch (ORPD) problem
The simultaneous application of three type FACTS device reduces the system active power loss to 22.504 MW for IHSA and 22.057 MW for IHSA which is the biggest reduction of active power loss in comparison to that of results obtained by solving conventional ORPD problem
Summary
Flexible AC Transmission System (FACTS) controllers such as Static Var Compensator (SVC), Thyristor Controlled Series Capacitor (TCSC) and Thyristor Controlled Phase Shifting Transformer (TCPST) are considered in addition with the conventional ORPD for additional active power loss minimization. Along with the conventional control variables in ORPD the optimal location and the settings of SVC, TCSC and TCPST are included in the optimization problem for additional active power loss reduction. The conventional ORPD problem was solved by the harmony search algorithm for IEEE 30 and 57 bus systems [17]. 2. Power flow model of facts devices The location and setting of flexible AC transmission system (FACTS) devices such as Static Var Compensator (SVC), Thyristor Controlled Series Capacitor (TCSC) and Thyristor Controlled Phase Shifting Transformer (TCPST) are considered as additional control parameters in the ORPD problem for further system loss minimization.
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