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Open-winding permanent magnet (PM) generator power system is an important research direction of wind power. Compared with rotor-PM motor, flux-switching permanent magnet (FSPM) machines have the advantage that is suitable for flux-weakening operation and has no risk of PM demagnetization. Hence, FSPM machine is applied to the open-winding power system in this paper and six topologies of FSPM machines...
State estimation plays a critically important role in ensuring the secure and reliable operation of the power grid. However, recent works have shown that the widely used weighted least squares (WLS) estimator, which uses several system wide measurements, is vulnerable to cyber attacks wherein an adversary can alter certain measurements to corrupt the estimator's solution, but evade the estimator's...
This paper presents a topology of cascaded multiple level PWM AC/DC converter with VIENNA cell for the application in High Voltage Direct Current Transmission (HVDC). Through a proper control method the proposed converter can be operated with unity power factor and the output voltage is increased. A detailed process of building mathematical model of the circuit is given. At last, according to the...
This paper introduces a systematic methodology for applying Mason's signal flow graph to the analysis of feedback circuits. We demonstrate that the relationships among signals of feedback circuits can be represented in a intuitive and graphical manner utilizing signal flow graphs. Once constructed, the desired solutions can be achieved by simple inspection of the signal flow graph. The Thevenin and...
We study the relationship between Directed Information Graphs (DIG) and Linear Dynamical Graphs (LDG), both of which are graphical models where nodes represent scalar random processes. DIGs are based on directed information and represent the causal dynamics between processes in a stochastic system. LDGs capture causal dynamics but only in linear dynamical systems and there are Wiener filtering to...
This paper deals with the problem of reaching the average consensus of a set of time-varying reference signals in a distributed manner. We analyze the approach initially presented in [1], giving an alternative proof of convergence which leads to larger, more realistic bounds on the step sizes that guarantee a steady-state error upper-bounded by a given constant. The interest of the new results appear...
The Kuramoto oscillator has been widely studied because it can model biological, social, chemical, and engineering problems. Conditions for frequency synchronization of a network of Kuramoto oscillators have been well established, but it depends on the connectivity of the network and on the natural frequencies. In this work we propose a consensus-based control strategy that forces the network to follow...
This paper examines the effects of biased nodes on the voter model dynamics where each node is characterized by binary states si = ±1. For a fully connected graph, the master equation is shown to have the form of the Fokker-Planck equation, and necessary and sufficient conditions for the existence of a polynomial solution are investigated. Numerical simulations and analytical results are studied for...
This paper studies the cooperative localization problem of sensor networks using local angle-of-arrival measurements in two scenarios. (i) The angle-of-arrival information can be mutually measured by pairs of sensors in their local frames which do not share the same orientation; (ii) The angle-of-arrival information can not be mutually measured by pairs of sensors but their local frames share the...
This paper deals with the problem of trajectory tracking of a class of power converters. To analyze the stability of these systems we consider the bilinear structure they admit. First, we propose the theoretical framework for which it is possible to ensure global tracking of trajectories. To do so, a construction of an output signal respect to which the incremental model becomes passive is carried...
Many applications require low power, low noise high pass and low pass filters. The Å kerberg-Mossberg filter represents an effective design solution. The Å kerberg-Mossberg topology allows straightforward implementation of the filter parameters however it suffers from internal instability issues. These instabilities are caused by the internal integrator. This paper presents a design methodology to...
In this article, a backstepping-forwarding transform is developed for the boundary stabilization of a class of non-strict feedback first-order hyperbolic systems. Sufficient conditions for the well-posedness of the resulting kernel equations are given, both in terms of the spectrum of some integral operators and, more conservatively, in terms of the magnitude of the coefficients of the system equation...
Second-order consensus tracking problem of uncertain multi-vehicle systems without velocity measurements is studied on the directed communication topologies. We first construct two dynamic controllers via a passivity-based approach for the nominal vehicle model, which are linear and bounded (nonlinear) respectively. We then develop conditions on linear uncertainty and disturbance estimators (UDEs)...
The paper examines the problem of systems redesign within the context of passive electrical networks by considering the problem of multi-parameter changes, their representation and impact on properties such as characteristic frequencies. The general problem area is the modelling of systems, whose structure is not fixed but evolves during the system lifecycle. The specific problem we are addressing...
This paper presents a high power AC-DC converter for wireless power transfer (WPT) using series resonant magnetic coupling technique. Large signal model and small signal model of the converter are analyzed. According to the small signal model, an analog compensator for closed loop control of the converter is designed. In order to realize high efficiency, zero voltage switching technique is applied...
This paper proposes two consensus algorithms for second-order nonlinear multi-agent dynamics. The objective of the algorithms is to guarantee two states of each agent reach consensus. Consensus is achieved asymptotically based on two “virtual states” in each agent. Both of the consensus algorithms use backstepping control to deal with the nonlinear section in each agent. By the first algorithm, the...
In this paper, we study the distributed blind equalization of networked single-input multi-output (SIMO) systems for which the transfer functions from a common source to multiple outputs are described by FIR filters. The blind distributed equalization is carried out by firstly estimating the multiple FIR filters followed by the associated equalizers. Two different schemes are employed for the distributed...
In this paper, a class of fractional multi-agent systems with external disturbances is studied. A pinning control strategy is designed for a part of agents of the multi-agent systems without disturbances, and this pinning control can bring multiple agents' states to reaching an expected consensus track. A disturbance observers based control (DOBC) are developed for disturbances generated by an exogenous...
A novel induction heating power supply topology using multilevel neutral point clamped inverter (MNPCI) is introduced and investigated in this paper. The proposed converter topology decreases the switching losses by lowering the DC link voltage to half its value with the operation under soft switching mode condition. Depending on the modified LLC optimum design being introduced, it shares the advantage...
In this paper we extend our previous work on deriving the control-to-output voltage transfer functions of pulse-width modulated current-mode controlled parallel-input/series-output dc-dc converters that operate in the continuous conduction mode by comparing the analysis results with responses obtained using the “ac sweep” tool available on PSIM simulation software. The topologies considered for the...
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