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A model of multi-winding high-voltage transformer is presented, which takes into account effects of leakage transformer, winding resistance and parasitic capacitance. The modeling method and the parameter determination procedure are applicable to all kinds of transformers. Using an LCR meter, all parameters, except the parasitic capacitance, can be determined from taking port impedance measurements...
In this paper, the different influences of three-limb and multi-limb transformer with Star-Star or Delta-Star connection, three-limb filter inductor, multi-limb filter inductor and position of the LC filter in a three-phase PWM inverter have been analyzed in detail in stationary dq0 frame. The analysis show that three-phase transformer with different limb numbers and connection types have different...
In this paper, a novel principle of a power quality conditioner based on controllable impedance is proposed for high voltage AC power distribution systems application. A linear transformer is employed to act as controllable impedance under the control of power electronic inverter. On the one hand, the transformer can always exhibit nearly zero impedance to harmonic current. Thus, the harmonic current...
Because of the negative-sequence magnetic field, the single-phase induction motor has higher temperature, lower output torque and lower efficiency comparing with three-phase induction motor. Based on negative-sequence magnetic field compensation principle, this paper presents a new type single-phase motor with a special stator windings configuration to weaken the negative sequence magnetic field and...
A known way to estimate the position of a switched reluctance motor without the use of a shaft position sensor is by excitation of a resonant circuit comprised by an idle motor phase winding and an external capacitor. This paper discusses the influence of the frequency of the sinusoidal excitation signal on the phase inductance. It is shown that the inductance decreases with increasing excitation...
This paper is concerned with the phenomena of very fast transient overvoltages (VFTO) invading the transformer windings. Some literatures have pointed out that the insulation breakdown usually locates near the entrance of the windings. So it is very important to study the voltage distribution along the coils near the entrance of the windings under VFTO. A new hybrid model is presented to simulate...
In the paper, a novel principle of variable reactor with a transformer and inverter control is proposed. A transformer with air gap is chosen and its primary winding is connected in series or parallel in power utility, the primary winding current of the transformer is detected and functioned as the reference signal. A voltage source PWM inverter is applied to produce a voltage, which is a controlled...
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