Sensorless Vector Control For Induction Motor Based On DSPACE

In recent years, the rapid development of power electronics, microelectronics, computer technology, modern control theory have provided the necessary conditions to achieve high-performance AC speed control of induction motor. Speed sensorless vector control technology is a new AC speed control technology that combine vector control and speed estimation algorithm. Compared with the traditional method of AC speed control, it reduces the installation of the speed sensor, which enhance the reliability of the system and reduce the cost of the system. Currently this control strategy has become a hot research direction.But the control algorithms of speed sensorless vector control strategy is relatively complex. If we use the traditional methods such as the DSP-based approach, you need to write a lot of code by hand. Debugging and error correction will take a lot of time, which makes the whole system become very long development cycle. The semi-physical simulation platform dSPACE is developed for this problem. It is a good solution to the shortcomings of code capacity, long cycle that traditional development method has.Firstly, the speed sensorless vector control strategies is elaborated in detail, including vector control principle, voltage space vector modulation principle, model reference adaptive system (MRAS) that be used to estimate the speed, and the use of Popov super stability theory proving the system stability. These above just prove the feasibility of speed sensorless vector control strategies theoretically, and then validate the the control algorithm through the MATLAB/Simulink simulation.Then the software and hardware of the dSPACE semi-physical simulation platform of are briefly introduced and build the whole experiment simulation system based on dSPACE. In the aspect of hardware, the power supply circuit, drive circuit, main circuit and protection circuit, voltage and current sampling circuit, dSPACE system interface circuit are designed; In the aspect of software, dSPACE combine Simulink module and its own RTI module to build system simulation model, and then convert the simulation model to code by compiling, the code will be loaded into the real-time hardware. Finally, we can debug the parameters online and monitor the experimental waveform by means of ControlDesk which is a comprehensive experiment and debugging software. The experiments based on speed sensorless vector control and dSPACE have made under the no-load and load conditions. It verify the practicability of the control strategy and the effectiveness of dSPACE through the analysis of experimental results.