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The sensor localization is an essential function for the wireless sensor networks applications. Based on the characteristics of the DV-hop algorithm, an improved algorithm is proposed for this range-free localization algorithm. The main principle of the proposed algorithm is giving more consideration on network topology properties and making improved hop size estimation through proper tradeoff between...
The real-time attitude computation is key to the accuracy of Strap-down Inertial Navigation System (SINS). This paper discusses the attitude updating quaternion algorithm of SINS and the quaternion recursive algorithm based on the third-order Taylor expansion. In order to reduce the influence of the non-commutative error caused by quaternion algorithm in high dynamic circumstances, we present a rotation...
As the heart of a hybrid fuel cell/battery system, energy management strategies play an important role in system efficiency. Base on the operation principles of low-power direct methanol fuel cell (DMFC), we established a parameter identification model for the system. Fuzzy-logic based control strategies for energy distribution were presented to ensure the high efficiency of DMFC and the battery state...
The elevator is a kind of complex system with time-varying and strong-coupling characteristics. For elevator systems, with use of traditional PID algorithm, as there are disadvantages of difficult optimal parameters selection, weak steady-state behavior, etc., it is difficult to achieve satisfactory control effect. Therefore, this article discusses the theory of using RBF neural network to identify...
This paper investigates the dissipation and stability of switched nonlinear differential algebraic systems. First, a novel dissipative Hamiltonian realization of switched nonlinear differential algebraic systems is put forward. Then, we discuss the characteristics of the dissipative property of series, parallel and feedback interconnected switched nonlinear differential algebraic systems. It is shown...
In this paper, an adaptive fuzzy controller for three-phase three-wire shunt active power filter (SAPF) is designed. The proposed adaptive fuzzy controller not only discards the system model building, but also owns a good dynamic response and robustness. An adaptive law based on Lyapunov synthesis approach is used to adjust the free parameters of the controller. The free parameters of the proposed...
The problem of decoherence suppression for the general N-level Markov open quantum systems is studied. Here, the quantum feedback control strategy is presented for the quantum ensemble. In order to find the control Hamiltonians and the measured observables, the new concept of the noise decoupling decomposition for the su(N) Lie algebra is introduced. It is shown that some state variables of the coherence...
This paper presents a discrete integral sliding mode control scheme with time-delay compensation for the output voltage regulation of an uninterruptible power supply (UPS) inverter. Since the inverter is subject to the parameter variation and the load disturbance and the time delay is introduced due to the adoption of digital control scheme, the controller is required to reject the disturbance as...
Active power filter(APF) will be the main device in harmonic elimination in future, and the control strategies for APF were generally based on the simplified mathematical models and seldom took the system parametric variation in consideration. Thus the system will destabilize, a novel control strategy based on neural networks is proposed. Discussions on the design of NARMA-L2 model-based controller...
Hamiltonian function method is important in the analysis and synthesis of nonlinear differential algebraic systems (NDAS), where the key process is to complete the dissipative Hamiltonian realization (DHR) of the considered system,. In this paper, we discuss the DHR problem of NDAS. First, a sufficient condition is given to complete the constant DHR. The construction of constant DHR of NDAS is discussed...
The high performance control of three-phase APF with hybrid dynamics is investigated in this paper. First, the hybrid dynamic uncertain model of the APF is transformed to a equivalent discrete-time switch linear uncertain systems (EDSLS) based on the pulse-width modulator (PWM) theory. Then, the EDSLS is further transformed to a linear equivalent discrete-time switch linear uncertain system by linearization...
In this paper, we consider the energy optimal control problem for the class of quantum systems evolving on SU(1,1). Analytic solutions are provided for the two-input case with respect to both normal and abnormal extrema. The involved dynamic model is widely used to describe physical problems in quantum theory.
A novel nonlinear excitation controller is proposed to coordinately enhance the voltage regulation accuracy and transient stability of power systems. First, a partial state feedback linearization is realized by employing inverse system method. Then, a stabilization controller is designed for the zero dynamic included system using Lyapunov function method. Simulation results verify the effectiveness...
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