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The application of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) in the dynamic state is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Positive and negative torque setpoint steps are simulated in the low torque and high torque range. Simulation results show that the number...
This paper presents a H∞ loop-shaping controller for regulating the switching signal of the inverter connected with a single-phase photovoltaic (PV) system. To facilitate the control design, the system is represented in terms of state space realization with uncertainties. The controller design involves achieving proper loop shapes through the choice of the proper weighting functions. A H∞ synthesis...
In this paper, a direct torque hysteresis controller (DTHC) driving a permanent magnet synchronous machine is discussed. A two-level, three-phase conventional inverter is used as means of power conversion. Advantages such as a low switching frequency as well as further opportunities of the DTHC are specified. The simulation results show a high degree of potential for the DTHC in future applications.
In the More-Electric-Aircrafts the role of the power converters is fundamental and in the last years the amount of electric power has increased rapidly. In this paper a power conversion stage is proposed and controlled for the Ground Power Unit of a More-Electric-Aircraft. The power conversion topology is based on paralleled converters with interleaved modulation which allows to overcome constraints...
On the basis of deep study on space vector PWM (SVPWM) technology, the simulation of permanent magnet synchronous motor (PMSM) closed-loop control system based on SVPWM technology is achieved by Simulink in this paper. The simulation results show that the PMSM control system has lower torque ripples, better speed tracking and strong robust to the load interferences, which is more suitable for high-performance...
In this paper, the structure of the multilevel invertor of multilevel invertor's circuit is analyzed based on ladder-wave PWM principle and waveform theory, and a method of switching angle control is proposed. The specified lower frequency harmonics is eliminated and the fundamental voltage is adjusted by controlling the switching time of power switches. The control strategy on PSPICES Simulation...
A new tracking scheme with the three sine parts controlled independently from each other is presented in this paper, by using this scheme, the switching signals of the three phases can be acquired at the same time, it can track any given magnetic flux to control the flux. By comparing the tracking and contrast, the switching state of each phase can be acquired, and combine the switching state of phase...
This paper presents a new switching technique for direct torque control of induction motor using four-switch three phase inverter (DTC-FSTPI-IM) for low power applications with DC - link voltage imbalance. The new control algorithm and modified switching table are based using a real-time compensation SVPWM technique when generating switching control signal in consideration of unbalanced DC-link voltages...
This paper introduces the TMS320LF2407A chip and studies its application in variable frequency speed regulation system. This system uses main circuit of AC-DC-AC voltage type frequency conversion; adopts SVPWM technology; takes TMS320LF2407A as the main control chip; and uses IPM-PW100CVA120 to the main circuit of inverter. The full digital implementation and the experimental Waveform based on TMS320LF2407A...
A 2D-hysteresis current controller has been designed. This hysteresis current controller combines the very fast dynamic response with a significant reduction of the necessary switching frequency compared with the classical hysteresis current controller. This is achieved by avoiding boundary cycles and using the zero voltage space vectors equally. A description of the general idea, simulation results...
A new constant-frequency hysteresis current control algorithm for PV grid-connected inverter is proposed, in which the complex plane is divided into six sectors based on line voltage space vector of electric power grid, and two-phase switches are decoupled respectively in every sector to control corresponding line currents, and the hysteresis band is modified by prediction, so that the output current...
Five-level inverter has been applied to industry and railway traction to solve the difficulty in applying low-voltage or medium-voltage switch devices to high-voltage system. The basic principle of diode-clamped five-level inverter is analysed in this paper. Based on the analysis of diode-clamped three-level inverter, single pulse control method, pulse width modulation(PWM) control methods and a novel...
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