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Voltage source converter based DSTATCOM has been accepted as the most preferred solution for reactive power management in distribution power networks which plays a vital role in improving power quality, correcting power factor and maintaining constant distribution voltages. However, the quality of DSTATCOM output voltage and current itself, such as injected harmonics and Total Harmonic Distortion...
In view of the fact that active power and reactive power have coupling relation, this paper deduces a novel and simple direct power control of three-phase pulse width-modulated rectifier with constant switching frequency using space-vector modulation(SVPWM), which the input active power and reactive power are decoupling controlled in d-q synchronous reference frame. The SVPWM modulation solves the...
In order to improve the performance of complementary half controlled three phase PWM boost rectifier, an improved control scheme including the current coordinate control and grid voltage oriented control is proposed. The current coordinate control is applied to obtain sinusoidal grid-side input currents and steady DC bus voltages. Grid voltage oriented control is applied to eliminate the impact of...
The aim of this paper is to present an approach that improves the proposal based on the complete dynamical model by Ko??mu??rcu??gil and Ku??krer. This control scheme works in the stationary frame and does not need to measure the input line currents, but it is sensitive to variations in the value of the line inductances. This paper proposes a method based on a Fuzzy Logic Controller (FLC) that uses...
In this paper a predictive control scheme is proposed for the VSC-HVDC system to achieve decoupled control of active and reactive power. The proposed control scheme, which is of simple structure, offers high tracking accuracy, fast dynamic response and good robustness. A case of two-terminal three-level VSC-HVDC system is developed in MATLAB/SIMULINK to verify the validity of the proposed control...
This paper proposes a four-multiple pulse width modulation (PWM) converter for grid interface, which is apply to the variable-speed constant-frequency direct-drive wind turbine systems. The paper introduces the principle of PWM converter, in order to improve DC voltage utilization, space vector pulse width modulation (SVPWM) technology is adopted. Then the advantages of the multiple based on carrier...
Reactive power is recognized as an essential factor in the design and good operation of power system. Real and reactive power on a transmission line in an integrated network is governed by the line impedance, voltage magnitudes, the angle of differences at the line ends, and the role the line plays in maintaining network stability under dynamic contingencies. Reactive power compensation or control...
Power factor correction (PFC) rectifiers are essential for load side harmonic and reactive power correction. In recent years, research and applications of PFC rectifiers have attracted more attention due to the increased energy awareness in the global. In this paper, a simple digital controlled three-phase six-switch H-bridge boost rectifier is proposed. The control objective is to operate the rectifier...
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