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This paper presents a new direct power control algorithm based on space vector modulation using sliding mode controller. For this algorithm, it introduces sliding mode controller to regulate the dc voltage, active and reactive power, and it is unnecessary to decompose the voltage and current into positive and negative sequence components, so its amount of calculation is greatly reduced. According...
A Space Vector Modulated based on Direct Power Control (SVM-DPC) method applied to a AC-DC Converter connected to the unbalanced input voltages was present in this paper. Asymmetrical grid fault is the main reason caused large 2nd harmonic DC voltage ripple and 3nd harmonic Current in AC side, which severely threaten the safety of the power converter. By using three PI-RES Controller to adjust DC...
Traditional control method of PWM(Pulse Width Modulation) rectifier has good dynamic and steady-state performance, But when PWM Rectifier worked under unbalanced voltages, various harmony powers occurred. Quality of output voltage and input current had been affected. Analyze unbalanced voltage and current through the method of symmetrical component, and two vector-oriented control strategy based on...
Permanent Magnet Synchronous Generators (PMSGs) have been widely used in modern wind power system. Direct-drive permanent magnet synchronous generator (D-PMSG) has shown significant advantages for its high efficiency, reliability, and become an attractive choice for variable-speed wind power generation. A Fast, robust, efficient, smooth controling power generated by the PMSG is essential for the D-PMSG...
A MRAS (Model Reference Adaptive System) method for evaluation of induction motor speed to achieve speed sensorless vector controlling by the variation of transient reactive power is discussed in terms of traditional methods. A mathematic model is derived, and the reliability of the speed estimator is performed in speed-torque domain using small signal analysis. The simulating model of speed-sensorless...
By analyzing the methods of harmonic and reactive current detection based on the instantaneous reactive power theory, some improvements for the detection method of constructing two-phase in single-phase circuit is presented, and the key algorithm to obtain the important current components is presented too. By studying on the method of active current separation, a new detecting method for harmonic...
The instantaneous reactive power theory is widely used in the detection of harmonic and reactive current in three-phase circuit, and can also be used in single-phase circuit detection. This paper deducts the detection method in single-phase circuit by constructing two-phase system based on the instantaneous reactive power theory. An improved algorithm to obtain the key circuit components is presented...
The instantaneous reactive power theory is widely used in the detection of harmonic and reactive current, and can also be used in single-phase circuit detection. A detailed deduction to the method of constructing two-phase system based on the instantaneous reactive power theory is presented. Aiming at the shortages in existing documents an improved algorithm to obtain the key circuit components is...
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