Patent application number | Description | Published |
20100080028 | POWER CONVERSION SYSTEM AND METHOD FOR ACTIVE DAMPING OF COMMON MODE RESONANCE - Power conversion systems and methods are presented for damping common mode resonance, in which inverter or rectifier switching control signals are selectively modified according to a damping resistance current value computed using a predetermined virtual damping resistance value in parallel with an output or input capacitor and a measured output or input voltage value to mitigate or reduce common mode resonance in the converter. | 04-01-2010 |
20110292696 | VARIABLE FREQUENCY DRIVE AND METHODS FOR FILTER CAPACITOR FAULT DETECTION - Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node current and/or voltages and detecting changes in the fundamental frequency component of the measured neutral condition at the fundamental frequency of the input power and/or based on input current unbalance. | 12-01-2011 |
20110299308 | COMMON MODE VOLTAGE REDUCTION APPARATUS AND METHOD FOR CURRENT SOURCE CONVERTER BASED DRIVE - Current source converter drives and common mode voltage reduction techniques are presented in which a space vector modulation zero vector for current source inverter (or rectifier) control is selected according to the switching state of the current source rectifier (or inverter) and according to the AC input power and the AC output power to control the output common mode voltage. | 12-08-2011 |
20120081061 | ADAPTIVE HARMONIC REDUCTION APPARATUS AND METHODS - Power conversion systems with active front end converters for example motor drives and power generation systems for distributed energy sources are presented with adaptive harmonic minimization for grid-tie converters for minimized or reduced total harmonic distortion in the line current spectrum including the source harmonic current and the grid-tie converter injected current spectrum referred to the line side. | 04-05-2012 |
20120106210 | MULTI-PHASE POWER CONVERTERS AND INTEGRATED CHOKE THERFOR - Power conversion systems and integrated multi-phase chokes providing high common mode to differential mode choke inductance ratios with circular and triangular shapes for concurrent differential filtering and common-mode voltage blocking in motor drives and other power conversion applications. | 05-03-2012 |
20120201056 | POWER CONVERTER WITH COMMON MODE VOLTAGE REDUCTION - Power conversion systems are presented with common mode reduction by space vector pulse width modulation zero vector selection to counteract common mode contribution of active vectors. | 08-09-2012 |
20120212982 | CMV REDUCTION UNDER BUS TRANSIENT CONDITION - Power conversion systems and control techniques are presented in which a bus transient control component bypasses selected phases of a rectifier during a protective mode of operation to reduce common mode voltages or currents. | 08-23-2012 |
20120271572 | VARIABLE FREQUENCY DRIVE AND METHODS FOR FILTER CAPACITOR FAULT DETECTION - Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node currents and/or voltages and detecting changes in a frequency component of the measured neutral condition and/or based on input current unbalance. | 10-25-2012 |
20130010504 | POWER CONVERTER AND INTEGRATED DC CHOKE THEREFOR - A power conversion system and a DC link choke therefore are presented, in which a continuous core structure is provided with first and second legs around which four or more windings are located, with one or more shunt structures providing a magnetic flux path between intermediate portions of the first and second legs. | 01-10-2013 |
20130057297 | METHOD AND APPARATUS FOR DETECTING POWER CONVERTER CAPACITOR DEGRADATION USING NEGATIVE SEQUENCE CURRENTS - Power converters and control techniques are presented in which capacitor degradation is detected according to negative sequence current by computing an uncompensated negative sequence current and a negative sequence voltage, compensating the negative sequence current based on the negative sequence voltage, comparing the compensated or uncompensated negative sequence current with an automatically calculated threshold and selectively identifying suspected degradation of one or more capacitors if the compensated negative sequence current exceeds the threshold value. The method can be used for power converters, control devices or protection relays for shunt capacitors or filters used in power systems. | 03-07-2013 |
20130063991 | VOLTAGE CONVERTER CONFIGURATIONS FOR SOLAR ENERGY SYSTEM APPLICATIONS - A system includes a low switching frequency power converter configured to be coupled to a solar cell, wherein the low switching frequency power converter is configured to generate alternating current (AC) power based on low voltage direct current (DC) power transmitted from the solar cell and transmit the converted AC power. The system also include a multi-pulse transformer configured to receive the converted AC power and generate transformed power based on the converted AC power, wherein the transformed power comprises power at a voltage level that differs from the a voltage level of the converted AC power. | 03-14-2013 |
20130141950 | POWER CONVERTER AND INTEGRATED DC CHOKE THEREFOR - A power conversion system and a DC link choke therefore are presented, in which a continuous core structure is provided with first and second legs around which four or more windings are located, with one or more shunt structures providing a magnetic flux path between intermediate portions of the first and second legs. | 06-06-2013 |
20130242623 | POWER CONVERTER AND INTEGRATED DC CHOKE THEREFOR - A power conversion system with multiple parallel connected motor drives including a plurality of rectifiers and a corresponding inverters connected by windings of a single common mode choke. | 09-19-2013 |
20140042817 | METHOD AND APPARATUS FOR BYPASSING CASCADED H-BRIDGE (CHB) POWER CELLS AND POWER SUB CELL FOR MULTILEVEL INVERTER - Bypassing methods and apparatus are presented along with power cells and sub cells for multilevel inverters in which DC current flow into a DC link capacitance is interrupted and a bypass switch is closed across a power cell or sub cell output to selectively bypass a power stage of a multilevel inverter. | 02-13-2014 |
20140268928 | POWER CELL BYPASS METHOD AND APPARATUS FOR MULTILEVEL INVERTER - Multilevel inverters, power cells and bypass methods are presented in which a power cell switching circuit is selectively disconnected from the power cell output, and a bypass which is closed to connect first and second cell output terminals to selectively bypass a power stage of a multilevel inverter, with an optional AC input switch to selectively disconnect the AC input from the power cell switching circuit during bypass. | 09-18-2014 |