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This paper presents a novel control method for PWM boost rectifier based on instantaneous power. Unlike most of the existing control strategies implemented in synchronous or p-q (active-reactive power) frame, the proposed method can provide unity power factor on the AC side in stationary frame. Rotating transformation and phase detection are eliminated, offering a very simple solution. Based on the...
Based on the mathematical model of the current source inverter (CSI) in the stationary alphabeta frame, this paper proposes advanced stationary frame voltage control methods for CSI with linear and nonlinear loads to achieve zero steady-state error respectively. The voltage control strategy based on a special resonant controller for CSI with linear loads is firstly analyzed in detail, on the basis...
Static power converters are used for many applications, like frequency converters for motors, uninterruptible power supplies(UPS's), general power supplies, and also with ground power units(GPU) for airplanes. This paper analyses the performance of high power static 400 Hz supply system. In such a system, the topology is a three single- phase H-bridge inverter with a multi-limb output transformer...
The model and the normal control method of the cascaded H-bridge active power filter is described firstly in this paper. However, problems exist in the normal control. One of the main problems is the unbalance of DC capacitor voltages of the H-bridge units. In this paper, an improved method for DC capacitor voltages control of the cascaded H-bridge active power filter is presented. With slightly shifting...
In digital control, the one-sample delay for computation which is often ignored in 50/60 Hz cases has great impact on the performance of a 400 Hz ground power unit (GPU). Taking the delay into account, a detailed proof that it is very hard and even impossible for 400 Hz GPU to maintain a low THD content in the output voltage using the conventional inductor, capacitor or load current feedback based...
The model and the normal control method of the cascaded H-bridge active power filter is described firstly in this paper. However, problems exist in the normal control. One of the main problems is the unbalance of dc capacitor voltages of the H-bridge units. In this paper, an improved method for dc capacitor voltages control of the cascaded H-bridge active power filter is presented. With slightly shifting...
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