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This paper discusses an optimized switching pattern for reducing an input current distortion of a matrix converter using a space vector modulation. The matrix converter has 27 instantaneous output voltage / input current patterns. In order to keep low input current distortion, the matrix converter always must select optimized switching pattern. A space vector modulation is one of solution of these...
This paper proposes a novel fixed off-time control method for single-phase micro-inverter operating in discontinues conduction mode. In this method, the off-time of the active switch is fixed to a constant value over the whole power level. The on-time of the active switch is obtained for current shaping without sensing inductor current. The proposed method has two advantages. One is that the switching...
One of the commonly used approaches to avoid the short circuit of power devices for pulse-width-modulation (PWM) inverters is to add dead-time into the control signals. The drawback of this approach is that severe distortion in phase currents and output voltages may occur. This paper proposes an adaptive-linear-neuron based nonlinearity compensation strategy to cope with the disturbance voltage caused...
In high-frequency (HF) pulsating voltage injection-based sensor-less surface-mounted permanent magnet synchronous motor (SPMSM) control, inverter nonlinearities and motor parameter asymmetries lead to harmonic errors in the estimated position. To eliminate these errors, the second-order generalized integrator (SOGI) is applied. An enhanced position observer with a selective harmonic error eliminator...
The three-level T-type inverter has received much interest in energy storage system due to high efficiency. This paper proposes a modulating method for three-level T-type to produce balanced three-phase output voltage with no low-order distortion even for different voltage of battery banks in series connection. In addition, the zero-sequence injection is realized to control the neutral current so...
Continuous conduction mode (CCM) boost power factor corrector (PFC) is widely used for high power applications such as server power supply. PFC performs AC/DC conversion with nearly unity power factor (PF) and low current harmonic distortion. However, the electromagnetic interference filter capacitors in front of the bridge diode and input filter capacitor behind the bridge diode incur phase leading...
In AC to DC power conversion application, totem-pole bridgeless PFC topology is drawing more attention, owing to its low semiconductor components count and high efficiency. The switches in totem-pole bridgeless PFC are usually operated as a pair of boost converters within a half-line-cycle, which is equivalent to unipolar pulse-width-modulation scheme. However, zero-crossing current distortion is...
The discrete Fourier transform (DFT) can be used to obtain the harmonic spectrum of input signal which makes it a key technology in active power filter (APF). The computation of conventional DFT algorithm is too complex to implement in a digital signal processor (DSP). By making use of the periodic characteristic of the input signal, the sliding DFT (SDFT) can greatly simplify the operation. But the...
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