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Water supply system has characteristics of non-linear, time-varying parameter, large time delay, so its mathematical model changes time by time. Water supply system widely use PID controller to keep constant pressure and PID controller need accurate mathematical model. The system that use PID controller is along with large overshoot, more adjusting time. Fuzzy controller don't need the accurate mathematical...
This paper repots an optimum on-time (OOC) control with predicting correction technique (PCT) for ripple-based buck converter. The switching frequency (FSW) variation is analyzed with completely considering the parasitic resistances of the components and devices. The proposed converter achieved nearly constant switching frequency over a wide load range without extra clock controlled circuits and current...
This paper presents a new approach to Direct Power Control (DPC) strategy using Space Vector Modulation (SVM) for the three-phase grid connected Voltage Source Converter (VSC) in the Renewable Energy Sources (RESs). The proposed DPC strategy is based on the Sliding Mode Control (SMC) and it is implemented in the dq reference frame. The active and reactive powers are directly controlled by VSC switching...
Aiming at the problem of induction motor (IM) parameters uncertainty, a novel L2 gain disturbance attenuation control algorithm based on Port-Controlled Hamiltonian (PCH) systems theory is presented for IM. Firstly, a PCH system model of IM is established. Secondly, using interconnection and damping assignment, the desired state error PCH structure is assigned to the closed-loop IM system by the energy-shaping...
Controllable AC loads are used to test AC sources, inverters and uninterruptible power supplies. They are designed to simulate constant-current, constant-resistance, constant-power, variable power factor, and nonlinear loads. They are also used to emulate variable AC load profiles in test-bench study of standalone energy conversion systems in research labs. High speed of response to the electronic...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
Induction motors have some inherent characteristics such as multivariate, parameter indeterminacy, strong coupling and non-linearity. These bring about a lot of trouble to the induction motor drive system. Considering the problems of AC speed regulation cause by the motor's inherent characteristics, a fuzzy control strategy based on the RBF neural network was presented. It was designed to make full...
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