Multilevel inverters for low-power application S De, D Banerjee, K Gopakumar, R Ramchand, C Patel IET Power Electronics 4 (4), 384-392, 2011 | 143 | 2011 |

A dual seven-level inverter supply for an open-end winding induction motor drive G Mondal, K Sivakumar, R Ramchand, K Gopakumar, E Levi IEEE Transactions on Industrial Electronics 56 (5), 1665-1673, 2008 | 122 | 2008 |

A hybrid multilevel inverter topology for an open-end winding induction-motor drive using two-level inverters in series with a capacitor-fed H-bridge cell K Sivakumar, A Das, R Ramchand, C Patel, K Gopakumar IEEE Transactions on Industrial Electronics 57 (11), 3707-3714, 2010 | 103 | 2010 |

Fast direct torque control of an open-end induction motor drive using 12-sided polygonal voltage space vectors C Patel, PP Rajeevan, A Dey, R Ramchand, K Gopakumar, ... IEEE Transactions on Power Electronics 27 (1), 400-410, 2011 | 81 | 2011 |

A space-vector-based hysteresis current controller for a general n-level inverter-fed drive with nearly constant switching frequency control A Dey, PP Rajeevan, R Ramchand, K Mathew, K Gopakumar IEEE Transactions on Industrial Electronics 60 (5), 1989-1998, 2012 | 56 | 2012 |

A seven-level inverter topology for induction motor drive using two-level inverters and floating capacitor fed H-bridges PP Rajeevan, K Sivakumar, C Patel, R Ramchand, K Gopakumar IEEE Transactions on power electronics 26 (6), 1733-1740, 2011 | 56 | 2011 |

Online computation of hysteresis boundary for constant switching frequency current-error space-vector-based hysteresis controller for VSI-fed IM drives R Ramchand, K Gopakumar, C Patel, K Sivakumar, A Das, H Abu-Rub IEEE Transactions on Power Electronics 27 (3), 1521-1529, 2011 | 55* | 2011 |

Improved switching frequency variation control of hysteresis controlled voltage source inverter-fed IM drives using current error space vector R Ramchand, K Sivakumar, A Das, C Patel, K Gopakumar IET Power Electronics 3 (2), 219-231, 2010 | 52 | 2010 |

A rotor flux estimation during zero and active vector periods using current error space vector from a hysteresis controller for a sensorless vector control of IM drive C Patel, R Ramchand, K Sivakumar, A Das, K Gopakumar IEEE Transactions on Industrial Electronics 58 (6), 2334-2344, 2010 | 50 | 2010 |

A five-level inverter scheme for a four-pole induction motor drive by feeding the identical voltage-profile windings from both sides K Sivakumar, A Das, R Ramchand, C Patel, K Gopakumar IEEE Transactions on industrial electronics 57 (8), 2776-2784, 2009 | 50* | 2009 |

A combination of hexagonal and 12-sided polygonal voltage space vector PWM control for IM drives using cascaded two-level inverters A Das, K Sivakumar, R Ramchand, C Patel, K Gopakumar IEEE Transactions on Industrial Electronics 56 (5), 1657-1664, 2009 | 44 | 2009 |

A pulsewidth modulated control of induction motor drive using multilevel 12-sided polygonal voltage space vectors A Das, K Sivakumar, R Ramchand, C Patel, K Gopakumar IEEE Transactions on Industrial Electronics 56 (7), 2441-2449, 2009 | 38 | 2009 |

Five-level inverter scheme for an open-end winding induction machine with less number of switches S Figarado, K Sivakumar, R Ramchand, A Das, C Patel, K Gopakumar IET Power Electronics 3 (4), 637-647, 2010 | 33 | 2010 |

A generalized-switch-matrix-based space vector modulation technique using the nearest level modulation concept for neutral-point-clamped multilevel inverters KJ Pratheesh, G Jagadanand, R Ramchand IEEE Transactions on Industrial Electronics 65 (6), 4542-4552, 2017 | 21 | 2017 |

A three level voltage space vector generation for open end winding IM using single voltage source driven dual two-level inverter K Sivakumar, A Das, R Ramchand, C Patel, K Gopakumar TENCON 2009-2009 IEEE Region 10 Conference, 1-5, 2009 | 21 | 2009 |

Anandarup Das, Rijil Ramchand, Chintan Patel, and K. Gopakumar,“A Hybrid Multilevel Inverter Topology for an Open-End Winding Induction-Motor Drive Using Two-Level Inverters in … K Sivakumar IEEE Trans. On Industrial Electronics 57 (11), 3707-3714, 2010 | 16 | 2010 |

A current error space vector based hysteresis controller with constant switching frequency and simple online boundary computation for VSI fed IM drive R Ramchand, C Patel, A Das, K Sivakumar, K Gopakumar, LM Patnaik IECON 2010-36th Annual Conference on IEEE Industrial Electronics Society …, 2010 | 14 | 2010 |

Current error space vector based constant switching frequency hysteresis controller for VSI fed Induction Motor drives J Peter, GD Marques, R Ramchand 2015 9th International Conference on Compatibility and Power Electronics …, 2015 | 12 | 2015 |

Modeling and simulation of single phase five level inverter fed from renewable energy sources K Biju, R Ramchand 2013 Annual International Conference on Emerging Research Areas and 2013 …, 2013 | 10 | 2013 |

Nearly constant switching space vector based hysteresis controller for VSI fed IM drive J Peter, MS KP, R Lakshmi, R Ramchand IEEE Transactions on Industry Applications 54 (4), 3360-3371, 2018 | 9 | 2018 |