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This paper proposes a new low voltage ride through (LVRT) strategy by utilizing extra resistance and inductance. Once voltage sag and low power demand occur simultaneously, the distributed generator (DG) is connected to low voltage (LV) grid through extra resistance and inductance. The active and reactive current injections are exploited to compensate voltage sag. Furthermore, the complication in...
This paper presents a variable-frequency asymmetrical voltage-cancellation (AVC) control technique for inductive power transfer system. The commonly used series-series compensation topology is focused. The principle of the proposed method is to avoid unintentionally hard switching operation suffered in traditional fixed frequency AVC control when operated under low output power. With the inclusion...
This paper presents a technique to control the output voltage of series-parallel (SP) topology inductive power transfer (IPT) system by using only a primary side controller which reduces cost, size, complexity and loss compared to the conventional IPT dual-side controller. The duty cycle of the inverter output voltage is controlled by a controller located in the primary side which keeps the DC output...
This paper presents a high efficiency LCCL series resonant inverter for ultrasonic dispersion system with resonant frequency tracking and asymmetrical voltage cancellation control. With the proposed control, the operating frequency of the inverter is automatically adjusted to track the resonant frequency under load parameter variation due to surrounding condition. The zero-voltage switching (ZVS)...
As PV penetration levels increased, its impact on electric power systems has attracted attentions worldwide. This paper presents analytical and experimental studies. Effects of the low-voltage grid-connected PV systems in rooftop scale are experimentally studied. The results represent the impact on point of interconnection in low voltage distribution system. Then we show analytical study of simplified...
This paper presents a novel single-phase ac–ac converter with power factor correction and output current control for circuit-breaker testing according to the IEC 60898 standard. The important advantages of the proposed circuit are low component count and fast responses for the standard requirement, especially a current step at the beginning of the test. The proposed single-phase ac–ac converter can...
This paper presents an application of single-phase ac-ac converter with ac output current controls according to requirements of circuit-breaker (CB) testing standard (IEC 60898). Traditionally, the current sources for CB tests are simply designed to use the motor driven tap changing of auto-transformer for ac output current regulation. However, this kind of current source cannot provide the step change...
This paper presents a novel topology of single-phase ac-ac converter with power factor control. The proposed converter can be operated in either buck or boost mode. It is practical, low-cost, and with a minimum number of devices. The control algorithms operate the converter under a wide range of operating output voltage, low harmonic distortion of ac input current and improved power factor. The closed...
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