# Performance Enhancement of Wound Rotor Induction Motor by VSI with Dynamic Capacitor Controlled Rotor Circuit

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2 proposed scheme uses only one capacitor with a three phase VSI bridge. 2. ROTOR IMPEDANCE CONTROL SCHEME 2.1 Switched Capacitor principle Fig.1. Basic H Bridge Switch with an ac capacitor C e Effective capacitance value C - External Capacitance d - Duty ratio of the H-bridge switch The switched capacitor concept is adopted in the proposed to change the capacitance value dynamically rotor circuit of proposed. 2.2 Switched Capacitor in the Rotor Circuit In [5], the switched capacitor concept has been used in the rotor circuit of the wound rotor induction motor as shown in the Fig. 3. In this, H-bridge switched capacitors are connected in each phase of the rotor circuit. The duty ratio of the capacitor circuit is varied in order to change the effective rotor capacitance value. The various performance parameters such as efficiency, power factor are found with respect to variation of slip and duty ratios. This scheme is employed in the rotor circuit of a three phase wound rotor induction motor in order to enhance the performance parameters of the motor. The expressions for Torque(T m ), input (P) & output power (P m ), efficiency and power factor values are derived from [5], [11] & [12] and given below. (a) P = Re = (4) (b) Q =Im = (5) Fig.2 RL circuit with switched capacitor during time interval t 1 b) during time interval t 2 -discharging In [4], the author describes the switched capacitor concept which is used to improve the power factor of the inductive circuit. It consists of placing an ac capacitor in the middle of an H bridge with bi-directional switches as shown in Fig.1. The complementary switch pairs (S1, S4) and (S2, S3), respectively, are switched using a PWM strategy. This structure is conceived to control the phase of the current in power inductive circuits. During time interval, the switch pair (S1, S4) is ON the capacitor is charging and a serial RLC circuit is modelled. In the time interval, the switch pair (S2, S3) is ON the capacitor is applied with reverse polarity to the RL circuit and the capacitor starts discharging. t1+ t2 =T (1) d= (2) Where V m = + (6) W m = (7) Thus the Power factor cosφ 1 and efficiency η may be estimated from Cos (8) (9) Where (10) In this way the effective value of the capacitance is given by C e =C/(2d-1) 2 (3) Here in (2), The expression for torque as function of speed is derived as 32

3 Where u s Space phasor stator voltage R s, R r Stator resistance and rotor resistance respectively L s, L r Stator inductance and rotor inductance respectively ω 1, ω 2 Angular velocity of Rotor and Stator circuit t e Electromagnetic Torque P M, P, Q Mechanical, Active and Reactive power p Number of poles (11) International Journal of Computer Applications ( ) 3.1 System Description In the proposed scheme, only one H-bridge switch with a capacitor and a VSI bridge circuit have been used. The number of components used in the proposed scheme is less compared with conventional secondary impedance control scheme. This also further reduces the switching losses. 2.3 Rotor Impedance Control T1 T2 T4 T3 Fig.4 Proposed Simulation Circuit of VSI with Dynamic Capacitor controlled rotor circuit The Fig.4 shows the proposed VSI with dynamic capacitor controlled Rotor impedance control. The Stator is given to the three phase supply and the rotor is fed three phase bridge inverter with a dynamic capacitor which emulates the variable capacitor. The duty ratio of the H-bridge circuit is varied in order to change the dynamic capacitor value according to equation (2). The duty ratio and frequency of the VSI bridge can be changed in order to work the induction motor at different slip speeds. Fig.3 Circuit diagram of rotor impedance control The Fig.3 shows the simulation circuit diagram of rotor impedance control scheme of the three phase induction motor. The stator is connected to three phase AC supply and each phase of the rotor is connected to H-Bridge with a capacitor placed in the middle of the H-bridge circuit. The capacitor is charging while the thyristors T1 and T3 is conducting. The capacitor starts discharging when the thyristors T2 and T4 conducting. The same switching action is performed in each phase of the rotor circuit. In the secondary impedance control scheme, totally three numbers of H-bridges switches (4 switches for each H-bridge) with three capacitors have been used. In this scheme, as more number of switches and capacitors are used, this may suffer from switching losses and become less cost effective. In order to overcome these drawbacks, the proposed has been adopted with less number of switches and a single capacitor in order to improve the motor performances. 3. PROPOSED VSI WITH DYNAMIC CAPACITOR CONTROLLED ROTOR CIRCUIT The performance parameters such as efficiency, power factor values with respect to duty ratios and slip at different loading conditions are obtained using Matlab simulations. The table 1 describes the varies simulation parameters of induction motor used for simulation. Table 1 Simulation parameters Motor Rating 110KW Voltage 325V Frequency 50Hz Stator Resistance 0.126Ω Stator Inductance mH Rotor Resistance 0.118Ω Rotor inductance mH Mutual Inductance Ω No.of poles 4 4. SIMULATION RESULT AND DISCUSSIONS In this proposed the external rotor circuit is connected to three phase bridge inverter which makes use of six switches and a H-bridge with a single capacitor. But in the existing secondary 33

4 I r impedance control, the external rotor circuit uses four switches and a capacitor in each phase (Totally 12 switches) and 3 capacitors which increase the switching losses and overall cost, thereby reducing the system efficiency. Simulation circuit is as shown in Fig Simulation Result 5. COMPARISON PERFORMANCES OF INDUCTION MOTOR PROPOSED METHOD AND EXISTING METHOD The comparison of both proposed and existing is done. The result shows that the performance parameters like power factor and efficiency are improved in proposed compared to that of the existing. There is a significant improvement in efficiency and power factor by order of 8-10%. In existing it uses four thyristors and a capacitor in each rotor phase, so totally it utilizes twelve thyristors and three capacitors. In proposed it uses totally a six thyristors and a capacitor in the rotor side. It reduces switching losses thereby increasing the system efficiency. The tables 2, 3, 4 & 5 and the graphs Fig.8, 9, 10 & 11 show the comparison of various performance parameters of proposed and existing rotor impedance control schemes for different slip and loading conditions. I s N Time Fig.5 Output Waveform of I r, I s Time Fig.6 Speed Waveform 5.1 Performance curve as variation of Duty Ratio Table 2 Power factor for different duty ratio Duty Ratio Power factor value of Proposed Power factor value of Conventional Table 3 Efficiency for different duty ratio Duty Ratio Efficiency value of Proposed Efficiency value of Conventional T Time Fig.7 Torque Waveform

5 5.2 Performance curve as variation of Load Efficiency curve Table 4 Power factor for different Load values Load values Power factor value of Proposed Power factor value of Conventional Fig.9 efficiency curve Table 5 Efficiency for different Load values Load values Efficiency value of Proposed Efficiency value of Conventional Power factor curve as variation of load Fig.10 Power factor curve 5.3 Comparison Graph Power Factor curve Efficiency curve as variation of load Fig.11 Efficiency curve Fig.8 power factor curve 35

7 Appendix Fig.12 Simulation circuit of proposed 37

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