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High-performance permanent-magnet synchronous machines show nonlinear behavior due to saturation effects. Nonlinear differential equations describe these phenomena which makes feedback control challenging. This paper presents a unified approach based on the current, flux linkage and voltage plane to visualize the physics of machine dynamics. A predictive control method to precisely control arbitrary...
This paper investigates two control approaches to stabilize MVDC microgrids under large perturbations. The control approaches compared here are a 2 Degree of Freedom (2DoF) linear control and a synergetic control for voltage stability of DC microgrids, where loads and generators are interfaced through power electronic converters. The stabilizing control of the bus voltage resides in the converters...
This paper investigates the use of adaptive backstepping as a decentralized control strategy for voltage stability of DC microgrids where the loads and generators are interfaced through power electronic converters. The stabilizing control of the bus voltages resides in the generation side interfacing converters. The loads are tightly regulated and exhibit Constant Power Load (CPL) behavior. This can...
High performance interior permanent magnet synchronous machines show nonlinear magnetics due to saturation and cross-coupling. Nonlinear differential equations describe these phenomena and make feedback control challenging. This paper presents a predictive control method to precisely control the dynamics of these machines. Four real-time capable strategies to online identify transient trajectories...
We present in this paper the modeling and control designs for a variable-speed constant-frequency wind energy conversion system using double fed induction generator. The aim of this paper is to develop a nonlinear vector control strategy using the second Lyapunov approach for the rotor side converter and a network voltage vector oriented control of the grid side converter and to maximize the energy...
Most of the reported control algorithms for uninterruptible power supplies use either inductor currents or capacitor currents of their filter as feedback variables to regulate the output voltage. This paper proposes a simple non linear control using current and voltage of a DC/AC inverter of an isolated three phase power network. Theoretical analysis and simulation results demonstrate fast response,...
This paper presents two multivariable nonlinear stabilizers, designed for a single machine infinite bus (SMIB) modeled by a standard ninth-order model. Multivariable feedback linearization (MFBL) and multivariable sliding mode control (MSMC) are proposed to regulate the output voltage and track the reference rotor angle at post-fault conditions. It is the first time that The MSMC method is designed...
An adaptive fuzzy sliding-mode (AFSM) control system is developed to control parallel DC-DC boost converters. The AFSM control system that combines a fuzzy adaptation technique with sliding mode control to enhance robustness and sliding performance in a class of uncertain multi-input multi-output (MIMO) nonlinear systems is proposed. Using an online adaptation scheme, a fuzzy sliding mode controller...
A robust adaptive nonlinear controller is designed for a Doubly-Fed Induction Generator (DFIG) wind turbine connected to a power grid. The controller main objective is to regulate the generator terminal voltage and rotor speed. A model based control design strategy is adopted. The controller structure and equations are obtained following a backstepping control design method using the DFIG reduced...
In this paper, the control of Voltage source converter which consists of six IGBT power switches is realized. Grid connection of VSC is provided through LCL filter and sinusoidal pulse width modulation (SPWM) technique which has 9 kHz switching frequency, is used for switching. Three different way of control including a - b - c, d - q and input - output linearization nonlinear control, are analyzed...
This paper presents an innovative control law for a distributed dc generation supplied by fuel cell (FC) generator. Basically, an FC is always connected with a power electronic converter. This kind of system is non-linear behavior. Classically, to control the voltage, the current or the power in the converter, linearized technique is often used to study the stability and to select the controller parameters...
The mathematic model of three-phase pulse-width modulated (PWM) voltage rectifiers is nonlinear, strong coupling. And the mathematic model error, time-varying uncertainties and external disturbance will influence the performance of the system. This paper presents a linear quadratic regulator (LQR) for the inner current loop control without decoupling, and a robust H∞ control method for the outer voltage...
As the helicopter is a strong coupling and nonlinear system, the original mathematical model of helicopter is linearized first and a new design method for the flight control based on sliding mode control is adopted. The optimal Linear Quadratic Regulator is used for the design of integral switching surface. The advantage of sliding mode control is its insensitivity to the model errors, parametric...
This paper presents the design considerations and the implementation of a cd-cd buck-boost converte, which can process the energy transferred from the ultra capacitors (UC) bank and batteries to the load (motor drive system of an Electric Vehicle EV). The UC bank is used as auxiliary source to supply the motor drive system which allows recovering the energy generated during the regenerative breaking;...
This paper presents a feedback linearization based controller design methodology for a unified power flow controller (UPFC) to achieve rapid reference signal tracking in the internal level. Feedback linearization control (FBLC) is a nonlinear technique based on differential geometry theory and overcomes the drawback of traditional PI control linearzing at one specific operating condition. FBLC is...
This paper presents the design of a non-linear controller for an energy hybridization structure involving a hydrogen fuel cell with supercapacitors for applications with high instantaneous dynamic power. The design of the controller is based on the interconnection and damping assignment - passivity based control, and compared with a standard controller strategy based on proportional-integral controller...
The main objective of this paper is to implement a nonlinear control for a PWM voltage source converter with a reduced number of sensors. For this purpose an input-output feedback linearization control strategy is firstly implemented in order to control both the line current and the DC output voltage. Next, an estimator of the AC mains voltage is implemented so as to reduce the number of the requested...
The control of cascaded H-bridge boost rectifiers is a challenging task, due to the inherent coupling of the H-bridge modules. This property highlights the demand for a robust control technique, appropriate for this nonlinear and non-minimum phase system. This paper introduces an approach that combines a deeper understanding of the system's power flow with the well known robustness of the sliding...
Control strategies for power supplies with actively controlled battery-ultracapcitor combinations are investigated for vehicular applications. Simple filters for allocation of load between battery and ultracapacitor can introduce phase shift that degrades performance. When used with a nonlinear algorithm for voltage control of the ultracapitor bank, a simpler frequency-independent gain factor gives...
A new “model-free” control methodology is applied for the first time to power converters, and in particular to a buck converter, and to a Ćuk converter. We evaluate its performances regarding load and supply variations. Our approach, which utilizes “intelligent” PI controllers, does not require any converter identification while ensuring the stability and the robustness of the control synthesis....
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