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The four-leg inverter is able to provide simultaneous power supply for three-phase or single-phase load with symmetrical voltage and constant frequency. The prerequisite is that the four-leg inverter must be controlled appropriately, so the synchronous rotating control strategy based on the decomposition sequence is proposed in this paper. Firstly, the inverter's mathematical model was given. Based...
This paper proposes an improved state-dependent Riccati equation (SDRE) attitude control approach which is applied in an unmanned helicopter (UMH). To deal with inherent unstable dynamics, the flapping, rotational dynamics and translational motion of UMH are organized into a multi-timescale nonlinear model. To overcome the problem that a number of terms can't be accounted in the SDRE design, we employ...
Due to the inherent hysteresis in a PAM, the accompanying control of such actuator becomes complicated. In this paper, the pressure/length hysteresis is mathematically described by applying a Maxwell-slip model. The model of this hysteresis is then fed forward to compensate for the actuator nonlinearities. The designed controller is therefore just a simple PI-controller. It shows robust performance...
This paper deals with the control of heat and mass transfer processes. The mathematical model of these processes is presented by a distributed parameter system with a so called distributed control and described by an inhomogeneous parabolic partial differential equation in one space dimension. The actuators in these processes are located above the channel, through that the medium to be heated flows...
In this paper, the mathematical model of three-level neutral-point-clamped (NPC) voltage source rectifier (VSR) using switching functions is founded firstly, and its operating principle is analyzed. Then a new nonlinear control law based on Lyapunov's stability theory for the PWM rectifier is presented. With this control law, the converter can be stabilized globally for handling large-signal disturbances,...
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