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In this paper, we propose a nonlinear control method for an interior permanent magnet synchronous motor (IPMSM) with dynamic copper loss minimization based on control Lyapunov function (CLF). A CLF based controller has advantages on simple control structure. We design a CLF considering copper loss minimization for IPMSM. Using the obtained CLF, we propose a controller to stabilize a desired torque...
Nonlinear receding horizon control (NRHC) attracts much attention in recent years. For NRHC, C/GMRES proposed by Otsuka is one of the most effective methods. Generalized minimal residual method (GMRES) is employed in C/GMRES, however, GMRES may become numerically unstable under some conditions in the sense of numerical calculation. This results in instability of the controlled system in the sense...
Power management of web server clusters have become a critical design issue because of its increasing power consumption and cooling cost. Current web server clusters are normally designed to have a performance capacity to handle peak loads, where all servers are fully utilized (turned on and running at maximum frequency). But in practice, peak load conditions rarely or never happen and most of the...
Receding horizon (RH) control attracts much attention in both the control theory and control applications. For RH control, we have proposed a new computation method for solving simultaneous linear equations by using a Moore-Penrose pseudoinverse and a singular value decomposition (SVD). In our proposed method, SVD is achieved by mdLVs and newly developed simultaneous error correction (SEC) method...
This paper presents a novel power reduction method for chip multi-processors (CMPs) under real-time constraints. While the power consumption of processing units (PUs) on CMPs can be reduced without violating real-time constraints by dynamic voltage and frequency scaling (DVFS), the clock frequency of each PU cannot be determined independently because of the performance impact caused by the conflict...
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