Design and Control of SR Drive System using ANFIS

ABSTRACT

This paper presents the modeling and simulation of an adaptive neuro-fuzzy inference strategy (ANFIS) to control the speed of the switched Reluctance motor .The SRM control is thus a difficult to be in use in the nonlinear applications, particularly in the control of speed in automobiles. The Neuro-fuzzy system incorporates the advantages of both neural-network and fuzzy system. This controller is great additional effectual than Fuzzy logic and neural network based controller, while it has the ability of self-learning the gain values and acclimatizes accordingly to situations, thus accumulating more flexibility to the controller. A complete simulation, well-designed to the nonlinear model of Switched Reluctance Drive was premeditated using MATLAB/SIMULINK.

KEYWORDS

1.      SR Drive

2.      ANFIS

3.      ANN

4.      FLC

SOFTWARE: MATLAB/SIMULINK

 BLOCK DIAGRAM

Fig.1.Block Diagram of ANFIS Controller for SRM Plant

Fig.2: Response of the Speed and Torque Control of SRM using ANFIS with Speed Command 3000 Rpm under no load conditions.

Fig.3: Response of The Speed and Torque Control of SRM using Fuzzy, ANN and ANFIS with Speed command 4000 rpm.

Fig.4: Response of the Speed and Torque Control of SRM using ANFIS with Speed Command 4000 rpm.

Fig.5: Response of the speed control of SRM using FUZZY, ANN and ANFIS with speed Command 3000 RPM under load Conditions

Fig.6: Response of the speed and torque control of SRM using ANFIS with speed Command 3000 RPM under load conditions

CONCLUSION

In this paper, ANFIS-based controller was presented for SR drives. The speed and torque control method existing in this paper and comparing with the previous control schemes(fuzzy &ANN), while it can be used in both no load and load operating speeds and conditions including speed and torque transients, zero-speed standstill, and startup, and does not suppose the linear characteristics of the SR motor. Moreover, the proposed technique does not need of complex calculations to be carried out during the real-time operation, and no complex mathematical model of the SR motor is required. A main thought in the research was the robustness and reliability of the speed controlling method.

REFERENCES

[1]         J. P. Lyons, S. R. MacMinn, and M. A. Preston, “Flux/current methods for SRM rotor position estimation,” in Proc. IEEE Industry Application Soc. Annu. Meeting, vol. 1, 1991, pp. 482–487.

[2]         S. R. MacMinn, C. M. Steplins, and P. M. Szaresny, “Switched reluctance motor drive system and laundering apparatus employing same,” U.S. Patent 4 959 596, 1989.

[3]         M. Ehsani, I. Husain, S. Mahajan, and K. R. Ramani, “New modulation encoding techniques for indirect rotor position sensing in switched reluctance motors,” IEEE Trans. Ind. Applicat., vol. 30, pp. 85–91, Jan./Feb. 1994.

[4]         G. R. Dunlop and J. D. Marvelly, “Evaluation of a self commuted switched reluctance motor,” in Proc. Electric Energy Conf., 1987, pp. 317–320.

[5]         Ramesh Palakeerthi, Subbaiah.P ,2014, ‘High Speed Charging and Discharging Current Controller Circuit to Reduce Back EMF by NeuroFuzzy Logic ‘, International Journal of Applied Engineering Research, vol. 9, no.22

Full-Soft-Switching High Step-Up Bidirectional Isolated Current-Fed Push-Pull DC-DC Converter for Battery Energy Storage Applications

ABSTRACT

This paper presents a novel bidirectional current-fed push-pull DC-DC converter topology with galvanic isolation. The control algorithm proposed enables full-soft-switching of all transistors in a wide range of input voltage and power with no requirement for snubbers or resonant switching. The converter features an active voltage doubler rectifier controlled by the switching sequence synchronous to that of the input-side switches. As a result, full-soft-switching operation at a fixed switching frequency is achieved. Operation principle for the energy transfer in both directions is described, followed by verification with a 300 W experimental prototype. The converter has considerably higher voltage step-up performance than traditional current-fed converters Experimental results obtained are in good agreement with the theoretical steady-state analysis.

KEYWORDS

1.      Current-fed dc-dc converter

2.      Bidirectional converter

3.      Soft-switching

4.      ZVS

5.      ZCS

6.      Push-pull converter

7.      Switching control method

SOFTWARE: MATLAB/SIMULINK

CIRCUIT DIAGRAM

Fig. 1. Full-soft-switching CF push-pull converter proposed.

SIMULATION RESULTS

Fig. 2. Simulation current and voltage waveforms of the switch S1.1.

Fig. 3. Simulation current and voltage waveforms of the switch S1.2.

Fig. 4. Simulation current and voltage waveforms of the switch S4.

CONCLUSION

A novel bidirectional current-fed push-pull converter with galvanic isolation was introduced. It features full-softswitching operation of all semiconductor components, while its DC voltage gain is higher than in traditional current-fed converters due to the utilization of the circulating energy for the input voltage step-up. As a result, it does not suffer from short intervals of energy transfer from the input side to the output side since at least half of the switching period is dedicated for this. Moreover, it does not require any clamping circuits, since the novel control algorithm features natural clamping of the switches at the current-fed side. Despite a relatively high number of semiconductor components, it shows the peak efficiency of 96.3%, which does not depend on the energy transfer direction for the corresponding operating point. Soft-switching operation with continuous current at the currentfed side makes the converter proposed suitable for residential battery energy storage systems. Further research will be directed towards experimental verification of the converter performance with a lithium iron phosphate battery.

REFERENCES

[1]         F. Blaabjerg, and D.M. Ionel, "Renewable Energy Devices and Systems – State-of-the-Art Technology, Research and Development, Challenges and Future Trends," Electric Power Components and Systems, vol.43, no.12, pp.1319-1328, 2015.

[2]         C, Heymans, S, B. Walker, S. B. Young, M. Fowler, "Economic analysis of second use electric vehicle batteries for residential energy storage and load-levelling," Energy Policy, vol. 71, pp. 22-30, Aug. 2014.

[3]         J. Weniger, T. Tjaden, V. Quaschning, "Sizing of Residential PV Battery Systems," Energy Procedia, vol. 46, pp. 78-87,2014.

[4]         S. J. Chiang, K. T. Chang and C. Y. Yen, "Residential photovoltaic energy storage system," IEEE Trans. Ind. Electron., vol. 45, no. 3, pp. 385-394, Jun 1998.

[5]         S. X. Chen, H. B. Gooi and M. Q. Wang, "Sizing of Energy Storage for Microgrids," IEEE Trans. Smart Grid, vol. 3, no. 1, pp. 142-151, 2012.

Hybrid-Type Full-Bridge DC/DC Converter With High Efficiency

ABSTRACT:

This paper presents a hybrid-type full-bridge dc/dc converter with high efficiency. Using a hybrid control scheme with a simple circuit structure, the proposed dc/dc converter has a hybrid operation mode. Under a normal input range, the proposed converter operates as a phase-shift full-bridge series-resonant converter that provides high efficiency by applying soft switching on all switches and rectifier diodes and reducing conduction losses. When the input is lower than the normal input range, the converter operates as an active-clamp step-up converter that enhances an operation range. Due to the hybrid operation, the proposed converter operates with larger phase-shift value than the conventional converters under the normal input range. Thus, the proposed converter is capable of being designed to give high power conversion efficiency and its operation range is extended. A 1-kW prototype is implemented to confirm the theoretical analysis and validity of the proposed converter.

KEYWORDS:

1.      Active-clamp circuit

2.      Full-bridge circuit

3.      Phase shift control.

SOFTWARE: MATLAB/SIMULINK

CIRCUIT DIAGRAM:

 Fig. 1. Circuit diagram of the proposed hybrid-type full-bridge dc/dc converter.

 EXPECTED SIMULATION RESULTS:

Fig. 2. Experimental waveforms for the gate signals and output voltage according to the operation mode. (a) PSFB series-resonant converter mode when V_d = 350 V. (b) Active-clamp step-up converter when V_d = 250 V.

Fig. 3. Experimental waveforms for soft switching in the PSFB series resonant converter mode. (a) ZVS turn-on of S₁ . (b) ZVS turn-on and ZCS turn-off of S₂

.

Fig. 4. Experimental waveforms for the current stress when V_d = 350 V. (a) Conventional PSFB series-resonant converter. (b) Proposed converter.

Fig. 5. Experimental waveforms for the input voltage V_d and output voltage V_o in the transition-state.

CONCLUSION:

The novel hybrid-type full-bridge dc/dc converter with high efficiency has been introduced and verified by the analysis and experimental results. By using the hybrid control scheme with the simple circuit structure, the proposed converter has both the step-down and step-up functions, which ensure to cover the wide input range. Under the normal input range, the proposed converter achieves high efficiency by providing soft switching technique to all the switches and rectifier diodes, and reducing the current stress. When the input is lower than the normal input range, the proposed converter provides the step-up function by using the active-clamp circuit and voltage doubler, which extends the operation range. To confirm the validity of the proposed converter, 1 kW prototype was built and tested. Under the normal input range, the conversion efficiency is over 96% at full-load condition, and the input range from 250 to 350 V is guaranteed. Thus, the proposed converter has many advantages such as high efficiency and wide input range.

REFERENCES:

[1] J. A. Sabat´e, V. Vlatkovic, R. B. Ridley, F. C. Lee, and B. H. Cho, “Design considerations for high-voltage high-power full-bridge zero-voltage switching PWM converter,” in Proc. Appl. Power Electron. Conf., 1990, pp. 275–284.

[2] I. O. Lee and G. W. Moon, “Phase-shifted PWM converter with a wide ZVS range and reduced circulating current,” IEEE Trans. Power Electron., vol. 28, no. 2, pp. 908–919, Feb. 2013.

[3] Y. S. Shin, S. S. Hong, D. J. Kim, D. S. Oh, and S. K. Han, “A new changeable full bridge dc/dc converter for wide input voltage range,” in Proc. 8th Int. Conf. Power Electron. ECCE Asia, May 2011, pp. 2328–2335.

[4] P. K. Jain, W., Kang, H. Soin, and Y. Xi, “Analysis and design considerations of a load and line independent zero voltage switching full bridge dc/dc converter topology,” IEEE Trans. Power Electron., vol. 17, no. 5, pp. 649–657, Sep. 2002.

[5] I. O. Lee and G. W. Moon, “Soft-switching DC/DC converter with a full ZVS range and reduced output filter for high-voltage application,” IEEE Trans. Power Electron., vol. 28, no. 1, pp. 112–122, Jan. 2013.

A Hybrid-STATCOM with Wide Compensation Range and Low DC-Link Voltage

ABSTRACT:

This paper proposes a hybrid static synchronous compensator (hybrid-STATCOM) in a three-phase power transmission system that has a wide compensation range and low DC-link voltage. Because of these prominent characteristics, the system costs can be greatly reduced. In this paper, the circuit configuration of hybrid-STATCOM is introduced first. Its V-I characteristic is then analyzed, discussed, and compared with traditional STATCOM and capacitive-coupled STATCOM (C-STATCOM). The system parameter design is then proposed on the basis of consideration of the reactive power compensation range and avoidance of the potential resonance problem. After that, a control strategy for hybrid-STATCOM is proposed to allow operation under different voltage and current conditions, such as unbalanced current, voltage dip, and voltage fault. Finally, simulation and experimental results are provided to verify the wide compensation range and low DC-link voltage characteristics and the good dynamic performance of the proposed hybrid-STATCOM.

KEYWORDS:

1.      Capacitive-coupled static synchronous compensator (C-STATCOM)

2.       Hybrid static synchronous compensator (hybrid-STATCOM)

3.       Static synchronous compensator (STATCOM)

4.       Wide compensation range  

5.      Low DC-link voltage

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Fig. 1. Circuit configuration of the hybrid-STATCOM.

EXPECTED SIMULATION RESULTS:

Fig. 2. Dynamic compensation waveforms of load voltage, source current, and load and source reactive powers by applying hybrid-STATCOM under different loadings cases.

Fig. 3 Dynamic compensation waveforms of v_x and i_sx by applying hybrid-STATCOM under (a) inductive load, (b) capacitive load and (c) changing from capacitive load to inductive load.

Fig. 4. Dynamic compensation waveforms of v_x and i_sx by applying hybrid-STATCOM under unbalanced loads.

Fig. 5. Dynamic compensation waveforms of v_x and i_sx by applying hybrid-STATCOM under voltage fault condition.

Fig. 6. Dynamic compensation waveforms of v_x and i_sx by applying hybrid-STATCOM during voltage dip.

CONCLUSION:

In this paper, a hybrid-STATCOM in three-phase power system is proposed and discussed as a cost-effective reactive power compensator for medium voltage level application. The system configuration and V-I characteristic of the hybrid-STATCOM are analyzed, discussed, and compared with traditional STATCOM and C-STATCOM. In addition, its parameter design method is proposed on the basis of consideration of the reactive power compensation range and prevention of a potential resonance problem. Moreover, the control strategy of the hybrid-STATCOM is developed under different voltage and current conditions. Finally, the wide compensation range and low DC-link voltage characteristics with good dynamic performance of the hybrid-STATCOM are proved by both simulation and experimental results.

REFERENCES:

[1] J. Dixon, L. Moran, J. Rodriguez, and R. Domke, “Reactive power compensation technologies: State-of-the-art review,” Proc. IEEE, vol. 93, no. 12, pp. 2144–2164, Dec. 2005.

[2] L. Gyugyi, R. A. Otto, and T. H. Putman, “Principles and applications of static thyristor-controlled shunt compensators,” IEEE Trans. Power App. Syst., vol. PAS-97, no. 5, pp. 1935–1945, Sep./Oct. 1978.

[3] T. J. Dionise, “Assessing the performance of a static var compensator for an electric arc furnace,” IEEE Trans. Ind. Appl., vol. 50, no. 3, pp. 1619–1629, Jun. 2014.a

[4] F. Z. Peng and J. S. Lai, “Generalized instantaneous reactive power theory for three-phase power systems,” IEEE Trans. Instrum. Meas., vol. 45, no. 1, pp. 293–297, Feb. 1996.

[5] L. K. Haw, M. S. Dahidah, and H. A. F. Almurib, “A new reactive current reference algorithm for the STATCOM system based on cascaded multilevel inverters,” IEEE Trans. Power Electron., vol. 30, no. 7, pp. 3577–3588, Jul. 2015.