With the availability of low cost high performance DSP chips characterized by the execution of most instructions in one instruction cycle, complicated control algorithms can be executed with fast speed, making very high sampling rate possible for digitally-controlled inverters. Control methods, which generate the necessary pulse space vector modulation (SVM) have been discussed extensively in literature. These could be classified as voltage controlled and current controlled SVM. All these methods aim at generating inverter output voltage without low-order harmonics. This paper presents theoretical and experimental aspects for DSPbased algorithm to generate space vector modulation (SVM) signals.
Although the inverters have traditionally been designed as analog circuitry, digital inverters are now preferred. These devices use low-cost microcontrollers or digital signal processors (DSP) and offer sophisticated control algorithms with highly flexible software, the ability to add user interfaces, reduce components, introduce testing procedures, and increase reliability.Generation of DSP-based patterns to control voltage source inverters substantially helped the development of modern electric drives used in various applications. Although the DSP control is well known, there are few papers that cover in detail the control signal generation methodology.Compared to the sinus PWM, the space vector modulation (SVM) present more advantages, (like frequency commutation, implementation…etc..) Specially, in machine direct control strategy: direct torque control or direct power control. This paper presents theoretical and experimental aspects for DSP-based algorithm to generate SVM signals. The SVM generation algorithm is written in Assembly language so it can be reused easily, in addition to the flexibility it provides in terms of changing the SVM switching frequency and the fundamental frequency of the inverter output voltage.
This paper focuses on a sliding mode power controller (SMPC) of a three-phase grid-connected voltage source converter (VSC). The proposed control scheme aims at regulating the DClink voltage of the converter and precisely tracking arbitrary power references, in order to easily control the system's power factor. Measures are also proposed to reduce the chattering effects inherent to SMC. Simulations performed under Matlab/Simulink validate the feasibility of the designed SMPC. Simulation results on a 1kVA grid-connected VSC under normal and faulted grid voltage conditions demonstrate good performance of the SMPC in terms of robustness, stability and precision.
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