|عنوان فارسی مقاله:||طرح هماهنگ مقاوم کنترلرهای PSS و STATCOM برای میراکردن نوسانات سیستم قدرت|
|عنوان انگلیسی مقاله:||ROBUST COORDINATED DESIGN OF PSS & STATCOM CONTROLLERS FOR DAMPING POWER SYSTEM OSCILLATION|
|رشته های مرتبط:||مهندسی برق، مهندسی الکترونیک، مکاترونیک، مهندسی کنترل و سیستم های قدرت|
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The main objective of this paper is to investigate the enhancement of damping the power system oscillation via coordinated design of the Power System Stabilizer (PSS) and STATic COMpensator (STATCOM) controllers. The design problem of PSS and STATCOM controllers are formulated as an optimization problem. Using the developed linearized model of a power system equipped with STATCOM-based stabilizer & PSS, the particle swarm optimization (PSO) algorithm is employed to search for optimal controllers parameters. In addition, the paper presents a singular value decomposition (SVD) based approach to asses and measures the controllability of the poorly damped electromechanical modes by different controllers’ inputs. The proposed controllers are evaluated on a single machine infinite bus power system with STATCOM installed. The nonlinear time domain simulation and eigenvalue analysis results show the effectiveness of the coordinated design in damping the power system oscillation.
Damping of a power system oscillation is one of the main concerns in the power system operation since many years [1-2]. Nowadays, the conventional power system stabilizer (CPSS) is widely used by power utilities. Generally, it is important to recognize that machine parameters change with loading making the machine behavior quite different at different operating conditions. Hence, PSSs should provide some degree of robustness to the variations in system parameters, loading conditions, and configurations. H∞ optimization techniques  have been applied to robust PSS design problem. However, the order of the H∞ based stabilizer is as high as that of the plant. This gives rise to complex structure of such stabilizers as reduces their applicability. A comprehensive analysis of the effects of the different CPSS parameters on the dynamic performance of the power system was presented in . It is shown that the CPSS provide satisfactory damping over a wide range of system loading conditions . Although PSSs provide supplementary feedback stabilizing signals, they suffer a drawback of being liable to cause great variations in the voltage profile. The recent advances in power electronics have led to the development of the flexible alternating current transmission systems (FACTS). Utilities are beginning to install FACTS devices in their transmission networks due to the increase in the power system requirements. It is well recognized that FACTS devices, in addition to their primary function, have the capability of enhancing the system damping . STATic COMpensator (STATCOM) is a second generation’s shunt connected FACTS devices based on a voltage source converter (VSC) using GTOs. STATCOM maintains the bus voltage by supplying the required reactive power even at low bus voltages and improves the power swing damping. STATCOM has several advantages over the conventional Static Var Compensation (SVC). An extensive attention has been directed for investigating the effect of STATCOM-based stabilizer on power system stability [7-11]. Assessment study of STATCOM & SVC on stability enhancement has been introduced in . It was verified that STATCOM-based stabilizer has a better performance compared to that of SVC-based stabilizer in damping power oscillations and fast voltage recovery. STATCOM model has been incorporated in to the Phillips-Heffron model and its AC/DC voltage regulators controllers’ interaction has been studied . Several approaches based on modern control theory have been applied to STATCOM-based controllers design such as variable structure controller , robust controller using H∞ technique, and loopshaping technique . Damping improvement of power system oscillation using STATCOM has been studied in ; however the robust controller design approach and coordination with PSS were not taken in to consideration in the design process. In this paper, a comprehensive assessment of the effects of robust controller design of the Excitation and STATCOM-based controllers when they applied independently and also through coordinated application has been carried out. The design problem is transformed into an optimization problem where the particle swarm optimization (PSO) algorithm is employed to search for the optimal settings of stabilizers’ parameters. A controllability measure based on singular value decomposition (SVD) is used to identify the effectiveness of each controller input. For completeness, the eigenvalue analysis and nonlinear simulation results are carried out to demonstrate the effectiveness and robustness of the proposed stabilizers to enhance system stability.