Patent application number | Description | Published |
20130009574 | APPARATUS FOR OPERATING INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR - Provided is an apparatus for operating interior permanent magnet synchronous motor in a system including a detector measuring a position and a speed of a rotor of an IPMSM, the apparatus including an output unit generating and outputting a current command driving a MTPA (Maximum Torque Per Ampere) based on the command torque, a correction unit correcting the current command outputted by the output unit, a feedback unit transmitting over-modulated voltage information to the correction unit, a control unit controlling the current command to output a voltage, a first limit unit limiting an output of the control unit using a maximum voltage synthesizable by an inverter unit, and the inverter unit applying a 3-phase voltage command for tracking a command torque to the IPMSM using an output of the first limit unit. | 01-10-2013 |
20130009575 | APPARATUS FOR OPERATING INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR - Provided is an apparatus for operating interior permanent magnet synchronous motor by receiving a first current command of a flux weakening control region I in a system including a detector measuring a position and a speed of a rotor of an IPMSM, the apparatus including a feedback unit transmitting over-modulated voltage information to a correction unit, the correction unit using the rotor speed and the over-modulated voltage information to correct the first current command to a second current command of a flux weakening control region II, a control unit controlling the second current command to output a voltage, a first limit unit limiting an output of the control unit to a maximum voltage synthesizable by an inverter unit, and the inverter unit applying a 3-phase voltage command for following a command torque to the IPMSM using an output of a voltage limit unit. | 01-10-2013 |
20130170256 | CONTROL APPARATUS FOR REGENERATIVE MEDIUM VOLTAGE INVERTER - A control apparatus for regenerative medium voltage inverter is disclosed. The control apparatus controls a switching of a PWM converter unit by generating a voltage compensating a power difference between an input and an output of the PWM converter unit. | 07-04-2013 |
20140032145 | APPARATUS FOR ESTIMATING CAPACITANCE OF DC-LINK CAPACITOR IN INVERTER - Disclosed herein is a capacitance estimation apparatus of a DC-link capacitance in an inverter. The apparatus according to the present invention may estimate a DC-link voltage, and compare it with a ripple size of the measured DC-link voltage to estimate a DC-link capacitance. According to the present invention, the capacitance of the DC-link capacitance contained in the inverter may be estimated in real time to detect the fault status in real time. | 01-30-2014 |
20140062354 | REGENERATIVE INVERTER DEVICE AND INVERTER DEVICE USING POWER CELL UNIT - An inverter device may include a converter unit configured to receive single phase AC power to output DC power; a capacitor unit configured to absorb the DC power; an inverter unit configured to synthesize the absorbed DC power to output the drive power of a load; and a converter controller configured to control the converter unit based on the AC power and the output DC power of the converter unit, wherein the converter controller includes a converter gate signal generator configured to control a plurality of gates contained in the converter unit; and an input line harmonic voltage generator configured to output converter additional power having a predetermined multiple of the frequency of the fundamental frequency component of the AC power with the same size as that of the fundamental frequency component of the AC power to an adder connected to the input side of the converter gate signal generator. | 03-06-2014 |
20140062380 | APPARATUS FOR ESTIMATING PARAMETER IN INDUCTION MOTOR - An apparatus for estimating a parameter of an induction motor is provided. The estimating apparatus receives an output from a current controller and d and q-axis currents in a synchronous reference frame applied to an induction motor, calculates an error of rotor resistance, and obtains a difference between the rotor resistance and nominal rotor resistance. | 03-06-2014 |
20140119067 | APPARATUS FOR ESTIMATING CAPACITANCE OF DC-LINK CAPACITOR IN INVERTER - An apparatus for estimating capacitance of a DC link capacitor in an inverter is provided. The apparatus for estimating capacitance of a DC link capacitor selects a unit power cell in which capacitance of a DC link capacitor is to be estimated, from unit power cells, and estimates capacitance of the DC link capacitor by correcting a reference voltage that controls a plurality of unit power cells. | 05-01-2014 |
20140132200 | APPARATUS FOR ESTIMATING PARAMETER IN INDUCTION MOTOR - An apparatus for estimating a parameter of an induction motor is provided. The estimating apparatus receives an output from a current controller and d and q-axis currents in a synchronous reference frame applied to an induction motor, calculates an error of rotor resistance, and obtains a difference between the rotor resistance and nominal rotor resistance to calculate stator resistance therefrom. | 05-15-2014 |
20140298063 | BATTERY DEVICE AND ENERGY STORAGE SYSTEM INCLUDING THE SAME - Provided is an energy storage system including: a battery device that is configured from multiple battery unit modules; and a power converting system that is configured to be connected to the battery device and that converts electric power that is applied between an electric power system and the battery device, in which the battery device includes multiple switches, each of which establishes a connection between each of the battery unit modules and the power converting system. | 10-02-2014 |
20140300309 | SENSORLESS VECTOR CONTROL APPARATUS FOR INDUCTION MOTOR - A sensor-less vector control apparatus for induction motor enhanced in performance of sensor-less vector control by estimating changes in parameters in real time is provided, the apparatus including a current controller, a first phase converting unit, a second phase converting unit, a rotor speed and position estimator configured to measure a rotor speed of a rotor and a rotor flux using an output value of the first phase converting unit and to estimate a rotor position using the output value, and a stator resistance and angle error estimator configured to calculate a stator resistance and an angle error of the induction motor by receiving d, q axis current commands on the synchronous reference frame inputted from the current controller and d, q voltages on the synchronous reference frame outputted from the current controller, and to provide the stator resistance to the rotor speed and position estimator. | 10-09-2014 |
20140307497 | MULTILEVEL INVERTER - A multilevel inverter having an efficient structure is provided, the multilevel inverter including a modularized phase-shift transformer including a plurality of modules to provide a phase shifted voltage by receiving a 3-phase input voltage, a plurality of first group unit power cells configured to provide an output voltage of predetermined phase, a plurality of second group unit power cells configured to provide an output voltage of predetermined phase, a plurality of third group unit power cells configured to provide an output voltage of predetermined phase. One of the first group unit power cells, one of the second group unit power cells and one of the third group unit power cells are paired to provide an output voltage of same phase. | 10-16-2014 |
20140362620 | MULTILEVEL INVERTER - A multilevel inverter having a configuration adequate to enhance efficiency while reducing conduction loss is disclosed, the multilevel inverter including a rectifier, a smoothing unit and an inverter unit, wherein the inverter unit includes a first switch unit interposed between the first node and a first output terminal, second switch units interposed between the second node and the first output terminal, a third switch unit interposed between the third node and the first output terminal, a fourth switch unit interposed between the first node and a second output terminal, fifth switch units interposed between the second node and the second output terminal and a sixth switch unit interposed between the third node and the second output terminal. | 12-11-2014 |
20140369088 | MULTI-LEVEL INVERTER - A multi-level inverter includes: a rectifying unit to rectify received a three-phase voltage; a smoothing unit to receive the rectified voltage and provide the rectified voltage as voltages having different levels to first to third different nodes; and an inverter unit including a plurality of switch units to transfer the voltages having three levels provided from the smoothing unit, wherein the inverter unit includes a first switch unit provided between the first node and a first output terminal, a second switch unit provided between the second node and the first output terminal, a third switch unit provided between the third node and the first output terminal, a fourth switch unit provided between the first node and a second output terminal, a fifth switch unit provided between the second node and the second output terminal, and a sixth switch unit provided between the third node and the second output terminal. | 12-18-2014 |
20150042253 | METHOD FOR DETERMINING PHASE ANGLE IN PHASE SHIFT TRANSFORMER FOR MEDIUM VOLTAGE INVERTER - A method for determining phase angle in phase shift transformer for medium voltage inverter is disclosed, the method including selecting an arbitrary phase shift angle and phase angle relative to a unit power cell of the first stage, determining a phase angle displacement in consideration of the phase shift angle and the number of unit power cells connected to each phase of a motor, determining a phase angle of the unit power cell at the second stage using a phase angle of the unit power cell at the first stage, and adjusting a phase angle when the determined phase angle of the unit power cell at the second stage exceeds a predetermined phase angle. | 02-12-2015 |
20150078049 | ELECTRIC POWER CONVERSION APPARATUS - The disclosure relates to an electric power conversion apparatus, and capable of determining a minimum output voltage of a boost converter based on a voltage of the grid, and comparing the minimum output voltage of the converter with an input voltage of the converter, and controlling the operation of the converter based on the comparison result, thereby reducing the unnecessary operation and switching loss of the converter, the electric power conversion apparatus according to the invention comprises a converter; and a control unit configured to detect a grid voltage to determine a minimum output voltage of the converter based on the grid voltage, and control the operation of the converter based on an input voltage of the converter and the determined minimum output voltage. | 03-19-2015 |