The unified power flow controller (UPFC) modeled in synchronous reference frame is investigated for the control of power flow in a transmission system. An ac voltage vector generated by a GTO-based inverter is injecte...
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The unified power flow controller (UPFC) modeled in synchronous reference frame is investigated for the control of power flow in a transmission system. An ac voltage vector generated by a GTO-based inverter is injected in series with the phase voltage in the transmission line to control real and reactive power flow. A robust H-infinity controller is proposed to regulate line currents in both the shunt and series inverters of the UPFC. The controller ensures robust performance and internal stability of the UPFC against power system disturbances and unstructured parameter variations. Conventional PI control system performance is compared with that based on the proposed scheme to highlight excellent robustness features in the new scheme. (C) 2000 Elsevier Science S.A. All rights reserved.
A general algorithm is presented for the identification of the parameters in the transfer-function matrix of a multi-input-multi-output (MIMO) system. The approach adopted is that of expanding the systeminput and out...
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A general algorithm is presented for the identification of the parameters in the transfer-function matrix of a multi-input-multi-output (MIMO) system. The approach adopted is that of expanding the systeminput and output variables in Laguerre polynomial series. The feasibility of the method lies in the generation of linear algebraic equations in the unknown parameters and initial conditions by means of an elegant operational matrix which relates Laguerre polynomials to their integrals. An example is included to illustrate the applicability of the proposed method.
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