Optimal Control Techniques Design to the Coordinated Control of Series Vectorial Compensator with Power System Stabilize
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CASE STUDY
Optimal Control Techniques Design to the Coordinated Control of Series Vectorial Compensator with Power System Stabilizers K. Himaja1 • T. S. Surendra2 • S. Tara Kalyani3
Received: 17 August 2018 / Accepted: 2 October 2020 The Institution of Engineers (India) 2020
Abstract This study proposes Series Vectorial Compensator (SVeC) with Power System Stabilizers (PSSs) to mitigate oscillations in a network. SVeC is a novel Flexible Alternating Current Transmission Systems (FACTS) series device and is generally used for controlling the reactance of a line by varying the duty ratio of ac link. The optimal techniques based on state feedback for Coordinated Control (COC) are used to improve the dynamic stability. So, the first Optimal State Feedback Controller (OSFC) based on quadratic concept and second Optimal Sliding Mode Controller (OSMC) design on the sliding surface are used to develop the control strategy to COC of SVeC with PSSs. The analyses with proposed controllers are checked on Western System Coordinating Council (W.S.C.C) test system under nominal load operation. The damping characteristics of OSMC are compared with OSFC for COC and without control. The results show that system damping can be significantly improved by the OSMC compared to OSFC and without control.
& K. Himaja [email protected] T. S. Surendra [email protected] S. Tara Kalyani [email protected] 1
Department of Technical Education, Government of Telangana, Hyderabad, India
2
Department of Energy Systems, Visionary Lighting and Energy, Hyderabad, India
3
Department of Electrical Engineering, JNTUH, Hyderabad, India
Keywords Power system stabilizer Series vectorial compensator Coordinated control Damping ratio Oscillations
Introduction Electrical power systems (EPS) are generally large nonlinear systems, which are repeatedly subjected to LowFrequency Oscillations (LFOs). Due to these oscillations in transmission corridors, the system becomes unstable and affects the component of electrical torque. The range of oscillations in different mode power systems 200 mHz to around 2 Hz depends on the loading condition [1]. These LFOs may continue and enhance in size resulting in the detriment of synchronism if no competent damping devices are available [1]. To damp oscillations place PSS to exciter of generator but, in long lines at heavy load, such a stabilizer not produce competent damping for the LFOs and the operation also is not fast particularly in multimachine networks. Nowadays power electronics propose the utilization of FACTS damping controllers to quickly damp out LFOs to improve the EPS stability [2, 3]. But, the uncoordinated control may not produce sufficient damping and produce interactions among them; to prevent interactions and produce sufficient damping between controllers, coordination between FACTS and PSSs may be needed [4–7]. The authors [8–13] carried out a study on ac–ac vectorial converters to obtain similar dc-ac converter objectives and these controllers need not have an inductor. The
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