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This paper describes the application of frequency domain multiplexing (FDM) to reduce the number of analog-to-digital converters (ADC) used in vector control of a permanent magnet synchronous motor (PMSM), when a resolver sensor is used as position transducer. The signals of the current sensors and the resolver sensor can have different bandwidths by selecting properly the excitation frequency of the position sensor and the switching frequency of the inverter, allowing an easy implementation of FDM. Two new signals are conformed by the combination of the outputs of the current sensors with those that belong to the resolver sensor. A set of digital filters allows the reconstruction of the original signals. As a result, only two ADCs are needed to get the current and the position signals, by using FDM. This fact reduces the complexity of the signal conditioning system, simplifies the implementation of vector control in processors as FPGAs and ASICs, which do not have implicit ADCs, and allows working with cheaper DSPs. Simulations and experimental results show that FDM can be successfully used in vector control of PMSM.

This paper presents a new methodology for the position and flux control of a permanent magnet synchronous motor (PMSM). SISO Fuzzy Takagi-Sugeno models (TS) of the position and d-axis stator current for PMSM are obtained. However, in despite to other techniques, an integrator is added to the local models of the d-axis stator current and the angular position. This fact reduces the steady-state errors, even considering the variation of the parameters of the motor. On the other hand, the addition of the integrator and the independent position and d-axis stator current models allows more flexibility in the placement of the closed-loop local model poles, in order to control the dynamic behavior of the PMSM. The closed-loop feedback gains are obtained using linear matrix inequalities (LMI) and concepts about D-stability regions. Simulation and experimental results show the benefits of the proposed control strategy.

This work proposes a new control strategy based on Adaptive Notch Filter applied to a Hybrid Active Var Compensator. The Hybrid Active Var Compensator is composed by a small rate active power filter in series with a capacitor bank. The objective is improving the behavior of the capacitor bank normally used as reactive power compensator. Under nonsinusoidal conditions the correct identification of the amount of reactive power needed is not an easy task. The proposed strategy using Adaptive Notch Filters can correctly identify the reactive power flowing through the distribution system even under nonsinusoidal conditions. The technique doesn't need any synchronization technique like a PLL. The control strategy is analyzed, simulated and practical results are presented in order to prove the effectiveness of the algorithm.