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Mobile robotics became an important knowledge area. Led by the technological advances, the life spectancy increases, rising the senior citizens ratio. At the same hand, the cities growth turn on a more intense and dangerous traffic. Autonomous mobile robots can help in these situations, but still have a jeopardized application. In this sense, this work presents a contribution to development of nonholonomic...
The use of low voltage DC microgrids is a promising concept that makes improvements in power quality and reliability to end users through different control techniques. A coordinated control strategy is addressed within DC microgrid for proper power management between sources and loads and regulation of DC bus voltage. For this; different modes of operation are performed based on state of charge of...
In the industry, CNC machine tools plays a irreplaceable role. It not only realizes the rapid industrial production, but also saves manpower and material resources. It is the symbol of modernization. As an important part of CNC machine tools, feed system plays a very important role on the processing process, It refer to the product's quality problems. According to the principle of mechanical dynamics,...
Static Synchronous Compensator (STATCOM) is one of the key device and key technology of FACTS. It can not only compensate the reactive power of electric power system, but also improve the property of steady state and dynamic state. This paper presents a STATCOM based on controlled reactor because of the STATCOM being used at present has some disadvantages. Then it can compensate much more reactive...
The LC filter introduced to the AC side of three-phase current source PWM rectifier, brought leading power factor. In addition, because of the nonlinearity of the PWM rectifier, the satisfactory effect could not be obtained with the traditional PID control system under larger disturbance and changes of controlled object. This paper described the technology of Combining traditional PID control with...
In order to study variable-frequency AC power system based on the hybrid excitation synchronous machine (HESM), this paper presents a modeling technique for a hybrid excitation synchronous starter/ generator system. The developed model of the system runs in MATLAB/SIMULINK environment and accounts, in a detailed manner, for the dynamics of the machine in the starting and the generating mode. Simulation...
Three-phase high-power rectifier has widely applied to electromotor and high-power AC-DC transformation, but there are many problems such as many harmonic waves and low power factor about high-power rectifier. Along with much request of green electrical source, it is more and more important to reduce its disturbance to electrical network. High-frequency PWM rectifier can adjust output voltage and...
Base on the characteristics of the shunt active power filter, we uses the power electronic devices of the MATLAB/Simulink to model the system, uses self-compiled S-function to carry out the ip-iq current detection algorithm. In order to compensate the harmonic currents generated by the non-linear load and the reactive power of the process, the PWM signal is generated to drive the IGBT by the way of...
The basic principle of space vector pulse width modulation (SVPWM) and a method of building two closed-loops vector control simulation model for permanent magnet synchronous motor (PMSM) are presented in this paper. At the same time, a new non-linear PID controller in speed closed-loop is studied. Simulation results show that it has good dynamic and static performances with no overshoot and small...
There are several conventional selected harmonic elimination techniques that form a class of pulse width modulation techniques (SHEPWM) that are very effective compared to other PWM schemes in the elimination of the low-order harmonics. However they suffer from a complicated computational process especially if the number of low order harmonics to be eliminated is high. This paper presents a new technique...
The previous methods on broken rotor bars fault diagnosis of squirrel cage induction motor (SCIM) were just for motors fed with industry frequency power supply. In this paper, a simulation modeling of SCIM supplied with variable frequency power is introduced, which respectively in normal condition and in broken rotor bars conditions. Through the comparison and analysis of the one-phase stator current...
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