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| Number | Title | Issue Date |
| 8076910 | Power factor correction using hierarchical context of a power monitoring system Automated power factor correction analysis methods based on an automatically determined hierarchy representing how IEDs and transformers are linked together in an electrical system for reducing a utility bill, releasing capacity to the electrical system, reducing lo... | 12/13/2011 |
| 7800347 | Control apparatus of DC-DC converter A control apparatus of a DC-DC converter includes a reactor and a switching element, repeats an accumulation and a discharge of energy of the reactor by a switching operation of the switching element, and converts a direct-current input voltage to acquire a direct-c... | 09/21/2010 |
| 7642757 | System and method for automatically operating UPFC (unified power flow controller) connected to SCADA (supervisory control and data acquisition) A system and method for operating a Unified Power Flow Controller (UPFC) connected to a SCADA (Supervisory Control and Data Acquisition) are disclosed. The UPFC automatic operation system receives power system data from the SCADA system, automatically determines UPF... | 01/05/2010 |
| 7538525 | Power factor correction circuit The present invention relates to a power factor correction circuit for compensating distortion of an input current. According to the exemplary embodiment of the present invention, a turn-on interval length of a switch is controlled according to a voltage induced in ... | 05/26/2009 |
| 7514907 | Device, system, and method for providing a low-voltage fault ride-through for a wind generator farm A device, a system, and a method for preventing power-producing wind turbine generators from tripping due to the detection of a low-voltage condition on a power grid are disclosed. The disclosed device includes a resistor bank that absorbs real power and a control s... | 04/07/2009 |
| 7402990 | Reduction of energization transients in a three phase power system A method and an apparatus for reducing energization transients in a three phase AC power system which includes an electrical device having legs A, B and C associated with corresponding phases of the power system. The method includes the steps of connecting the legs ... | 07/22/2008 |
| 7378821 | Method and apparatus using VAR measurements to control power input to a three-phase induction motor circuit A method and apparatus are described for controlling the flow of power in each input line to a three phase AC inductive load in order to reduce the amount of VAR in the system, and thus increase the operational efficiency of the inductive load. Solid state relays ar... | 05/27/2008 |
| 7342758 | Method and system for detecting stand-alone operation of a distributed generating system A method and a system for detecting stand-alone operation of a distributed generating system having a generating source connected in shunt with an independent power distribution system via a first branch breaker are proposed. A voltage or a frequency signal on the i... | 03/11/2008 |
| 7330363 | Converter circuit with two converter elements A converter circuit having a first and a second converter element is specified, with each converter element having a DC voltage circuit and in each case one converter element phase (u1, v1, w1) of the first converter element being connected to a... | 02/12/2008 |
| 7312537 | Methods and apparatus for supplying and/or absorbing reactive power A wind turbine includes a rotor having a hub, at least one rotor blade coupled to the hub, and a rotor shaft coupled to said hub for rotation therewith. The wind turbine also includes an electrical generator coupled to the rotor shaft, and a generator-side frequency... | 12/25/2007 |
| 7307403 | System and method for DC power generation from a reluctance machine A system and method is provided for generating DC power using a synchronous reluctance machine (12) or a salient-pole synchronous machine (102) and a power converter (110). The present invention can be used to achieve power production for a sync... | 12/11/2007 |
| 7296168 | Method and apparatus to minimize power and ground bounce in a logic device A predictive power regulation apparatus and method that minimizes power and ground bounce in a logic device. The apparatus includes a predictor and a voltage or current smoothing device connected to the predictor. The voltage or current smoothing device outputs adju... | 11/13/2007 |
| 7288921 | Method and apparatus for providing economic analysis of power generation and distribution An economic dispatch program optimally allocates load demand specifying real power and reactive power to be generated by a power plant among various power generators in a manner so that each of the power generators are operated within its optimal operating space as ... | 10/30/2007 |
| 7272026 | Power converter for a hybrid power filter A power converter for a hybrid power filter includes a power electronic switch set and a DC capacitor. The power converter permits a power line of a power system to directly connect or connect through the passive power filter to a positive or a negative terminal of ... | 09/18/2007 |
| 7262520 | Robust power distribution systems and methods The present invention provides systems and methods that allow for individual power sources to be disconnected and reconnected without interrupting the power supply from the other power sources and that allow for these power sources to provide power at substantially ... | 08/28/2007 |
| 7262584 | Efficient fast pulsed laser or light-emitting diode driver A capacitor is connected to the output of a multiphase power converter, and a current-driven device (e.g., LED or laser diode) is also connected to the power converter output. A solid state switch (FET or IGBT) is connected in series with the current-driven device. ... | 08/28/2007 |
| 7248946 | Inverter control methodology for distributed generation sources connected to a utility grid The present invention provides an improved control methodology for maximum power point tracking (MPPT), anti-islanding, and output current regulation for distributed generation sources connected to a utility grid. The control includes enhancements for MPPT and regul... | 07/24/2007 |
| 7236338 | System and method for remotely detecting and locating faults in a power system A system and method are provided for remotely detecting and locating faults in a power system. The system includes at least one slave controller and at least one supplemental protection module. The slave controller is disposed proximate at least one load and electri... | 06/26/2007 |
| 7227277 | Multiple input DC-DC power converter Apparatuses and methods for converting a plurality of dc input voltages from a plurality of voltage sources to at least one dc output voltage. An apparatus embodiment includes a plurality of voltage inputs. A respective current-conducting-bidirectional-voltage-block... | 06/05/2007 |
| 7222111 | Multi-utility energy control and facility automation system with dashboard having a plurality of interface gateways A multi-utility energy and facility automation control system has control center computer(s) connected to utility consuming systems and software that formats energy data, stores, retrieves, diagnoses and acts in response to changes and includes a multi-utility maste... | 05/22/2007 |
| 7212550 | Synchronization method and synchronization arrangement The invention relates to a method and arrangement for synchronizing a base station in a radio system. In the solution, a synchronization signal is transmitted in a cable for transferring electric power, from which cable the base station filters the synchronization s... | 05/01/2007 |
| 7202640 | Power factor improving circuit The power factor improving circuit has a current detecting resistor Rsh for detecting current conducting through a set up reactor L1 or current conducting through a switch Q1, an output voltage detector 11 which amplifies a difference between ou... | 04/10/2007 |
| 7199528 | Control circuit for maintaining constant power in power factor corrected electronic ballasts and power supplies The control circuit for maintaining constant power in power factor corrected electronic ballasts and power supplies maintains constant power in a variable load. This constant power control circuit provides a closed loop constant power management process for gas disc... | 04/03/2007 |
| 7194338 | Voltage collapse diagnostic and ATC system An analysis method for an electrical power system whereby the plurality of buses are grouped into agents, family lines of agents and families of agents based on the reactive reserves depleted when the buses are loaded. Contingencies are then applied to the electrica... | 03/20/2007 |
| 7190149 | Method and apparatus for determining actual reactive capability curves A system for generating updated reactive capability curves of a generator operates the generator at a number of operating load levels and at a number of different power factors to collect data regarding the real and reactive power generated at each of the various op... | 03/13/2007 |
| 7173349 | Equipment and method for exchanging power, in shunt connection, with an electric power network, and use of such equipment Equipment for exchanging power, in shunt connection, with an electric power network. A reactive impedance element and a voltage source converter provide mutual connection in series. The power network has a nominal voltage of a fundamental frequency and a given phase... | 02/06/2007 |
| 7161257 | Active anti-islanding system and method An engine control system suited for use with an engine that outputs electrical power to a local load and is electrically connected to an electrical grid. The engine control system includes a set point control operable to set an engine power output value and a sensor... | 01/09/2007 |
| 7157885 | Inverter controlled generator set and method for controlling the same A method for controlling an inverter controlled generator set which comprises a DC power source section having as a power source a generator driven by an engine and an inverter which converts an output of said DC power source section into an AC output, the method co... | 01/02/2007 |
| 7154253 | Digitally controlled modular power supply for automated test equipment A digitally controlled hybrid power module is controlled by a programmable controller. The hybrid power module includes a digitally controlled switching supply with an output coupled to an input of a digitally controlled linear voltage regulator. Independent control... | 12/26/2006 |
| 7148650 | Maximum power point motor control A method and apparatus are implemented in software to control motor speed as a function of available power in a DC source-inverter-AC motor system, i.e. to perform maximum power tracking of motor speed. An inverter or motor drive converts DC power from a DC source, ... | 12/12/2006 |
| 7126294 | Method and device for controlling photovoltaic inverter, and feed water device A photovoltaic inverter control method includes steps of monitoring a variation in output voltage of a solar battery by a power and voltage monitoring circuit (51) and, when the variation occurs, accelerating or decelerating an electric motor (3) to ma... | 10/24/2006 |
| 7119452 | Voltage control for wind generators A wind turbine generator control system includes relatively fast regulation of voltage near the individual generators with relatively slower overall reactive power regulation at a substation or wind farm level. The setpoint of the relatively fast voltage regulator i... | 10/10/2006 |
| 7116010 | Control of small distributed energy resources A power electronics interface in a microsource controller allows efficient connection in a power system of small, low cost and reliable distributed generators such as microturbines, fuel cells and photovoltaic. Power electronics provide the control and flexibility t... | 10/03/2006 |
| 7117070 | Power flow controller responsive to power circulation demand for optimizing power transfer A power flow controller responsive to power circulation demand for optimizing power transfer is disclosed. When a power flow controller operates at its rated capacity, it can no longer regulate from-bus voltage set-points, line power flow set-points, or both. In suc... | 10/03/2006 |
| 7106564 | Devices and methods for detecting islanding operation of a static power source Devices and methods for detecting islanding operation of a static power source involve injection of a non-harmonic error on the phase angle of the static power source in regular steps to introduce a very small intentional phase shift for the output voltage of the st... | 09/12/2006 |
| 7098631 | Method and control circuit for power factor correction A power factor correcting converter includes a control circuit that modulates on and off intervals of a power switch so that a momentary input current of the converter is directly proportional to both a momentary value of an input voltage of the converter and to a m... | 08/29/2006 |
| 7091703 | Dynamic reactive compensation system and method The invention features a system for connection to a utility power network. The system includes a reactive power compensation device coupled to the network and configured to transfer reactive power between the utility power network and the reactive power compensation... | 08/15/2006 |
| 7092229 | Electrical filter/protector, and methods of constructing and utilizing same A device for an electrical power system having a nonlinear load. The circuit is connected in series with the nonlinear load and is tuned to the third harmonic of the power source frequency. The circuit substantially eliminates the harmonic currents and neutral curre... | 08/15/2006 |
| 7049774 | Apparatus for controlling power factor compensation in inverter control circuit and method thereof The present invention provides an apparatus for controlling power factor compensation and method thereof, in which a turn-on timing point of a power factor compensation switch is delayed by a prescribed time from a zero crossing timing point to enhance a power facto... | 05/23/2006 |
| 7045913 | Microturbine engine system A microturbine engine that includes a compressor that is operable to provide a flow of compressed air. The compressed air flows through a recuperator where it is preheated before delivery to a combustor. The preheated compressed air mixes with a fuel and is combuste... | 05/16/2006 |
