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This paper proposes a new senseless start-up method using a closed loop current control and a flux estimator without position sensor, and it is composed of four step sequence. Step 1 is applied for detection of the initial rotor position, and an initial rotor position is estimated around 1% of accuracy within 150ms. Step 2 is applied for a stable start-up state from the standstill through a closed...
This paper proposes a new senseless start-up method by using a terminal voltage/current without position sensor. A flux estimator consisting of field flux model, P controller and flux voltage model is proposed and rotor angle/speed is estimated by using a phase locked loop. Furthermore, initial rotor angle is estimated rapidly and accurately by using the same flux voltage model during the initial...
This paper proposes a senseless start-up method of load commutated inverter system by using a modified integrator with an adaptive compensation. The sensorless algorithm is composed of flux estimator by a modified integrator with an adaptive compensation and rotor angle/speed estimator based on phase locked loop. The flux estimator consists of low pass filter, quadrature detector and PI controller...
This paper discusses a battery ripple current effect on battery lifetime and mitigation of the second harmonic current in a single-phase battery charger for residential use. A new L-C resonant circuit is added to reduce the second harmonic current component which flows into battery bank. The second harmonic component reduction method is analyzed with an equivalent circuit of battery model, resonant...
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