Direct Power and Torque Control of AC/DC/AC Converter-Fed ...

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6. Simulation and Experimental Results a) b) t=680 ms Fig. 6. 11. Experimental torque tracking performance at constant speed (71%). Step change from 0% to 75 % to 0% of nominal torque. The proportional gain of the DC-link voltage controller K is 5.5 times higher then calculated; a) With active power feedforward PF Ω , b) With PU active power feedforward PF UI . From the top: DC-link voltage 100V/div, line current 10A/div, active 2.5kW/div and reactive 2.5kVar/div power, mechanical speed of IM 1000rpm/div, stator current 10A/div, command and estimated torque 20Nm/div. DC-link capacitor C=47uF In Fig. 6. 10c,d and Fig. 6. 11 the results with higher proportional gain of the DClink voltage controller K PU are shown. Note that the gain is up to 5.5 times higher than calculated while in simulation is 10 times higher than calculated. The reason is in instable operation for higher then 5.5 gain in experiment. In Fig. 6. 11a an unstable operation of VSR with active power feedforward – PF Ω is shown. In time t=680 ms the over current protection switched off the control of the VSR and the system operates with diode rectifier as an AC/DC converter. While, in Fig. 6. 11b very good operation of the system with active power feedforward – PF UI is presented. It should be stressed that in this case of transients the stiff DC-link voltage is obtained (see Fig. 6. 11b). 114
6. Simulation and Experimental Results a) b) t=T A t=T A Fig. 6. 12. Experimental torque tracking performance at constant speed (71%). Step change from 0% to 75 % to 120% of nominal torque. The proportional gain of the DC-link voltage controller K is 5.5 times higher then calculated and with active power feedforward PF PU ; a) load fault and control of VSR is off, b) load fault and control of VSR is on. UI From the top: DC-link voltage 100V/div, line current 10A/div, active 2.5kW/div and reactive 2.5kVar/div power, mechanical speed of IM 1000rpm/div, stator current 10A/div, command and estimated torque 20Nm/div, C=47uF In case presented in Fig. 6. 12 operation of the system with active power feedforward PF UI is shown. In time t=T A the load fault is applied (120% of nominal torque). In Fig. 6. 12a over current protection switched off the VSR control and system operates with diode rectifier as an AC/DC converter. While, in Fig. 6. 12b VSR controller mitigated the fault and keep the DC-link voltage at desired level with reactive power equal to zero. Note that even under distorted load conditions, the scheme with active power feedforward operates properly (satisfactory). 115
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POLITECHNIKA WARSZAWSKA WARSAW UNIV
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Acknowledgements The work presented
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Contents 4.2.2. Energy of the DC-li
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Chapter 1 1. Introduction 1.1. AC/D
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1. Introduction Tab. 1. 1. Current
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1. Introduction DC-link voltage to
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1. Introduction then nominal speed
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1. Introduction [69]. From that tim
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Chapter 2 2. Voltage Source Convert
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2. Voltage Source Converters - VSC
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Chapter 3 3. Vector Control Methods
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3. Vector Control Methods of AC/DC/
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Page 131 and 132: 7. Summary and Conclusion • easy
Page 133 and 134: References [18] G. Buja, M. P. Kazm
Page 135 and 136: References [58] J. G. Kassakian, M.
Page 137 and 138: References [96] H. Mao, D. Boroyevi
Page 139 and 140: References [133] A. Tripathi, A. M.
Page 141 and 142: References [167] M. Jasiński, D.
Page 143 and 144: Symbols Employed I L - I LA I r - r
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Direct Power and Torque Control of AC/DC/AC Converter-Fed ...

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