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7622826 |
Flicker improvement effect evaluating system
A flicker improvement effect evaluating system evaluates an effect of improvement of voltage flicker in a power system to which a static reactive power compensator is to be introduced. A system...
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7508689 |
Inverter and a drive system using the inverter
A inverter has a switching device for switching DC to change it to AC, and a bipolar type rechargeable battery connected to the switching device in parallel or in series for smoothing the current...
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7436661 |
Two-compartment AC adaptor
An external AC power adaptor having an additional compartment for cooling. The adaptor has a housing that defines a first compartment having power circuitry for converting an AC input to a DC...
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7382303 |
Non-perturbing power supply margin controller
A power supply margin controller may alter the voltage of a control signal used to control the output voltage of a power supply. The controller may include a digital-to-analog converter having an...
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7365525 |
Protection for switched step up/step down regulators
A four switch voltage converter is regulated for buck mode and boost mode under constant frequency valley-peak current mode control. Protection circuits are responsive to output voltage and...
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7353122 |
Power converters with limited operation to conserve power and with adjustments that overcome ringing
To conserve power when regulating the output voltage (Vo) of a power converter, no adjustment is made to the converter's pulse width modulation times (Tp, Ts) even if the output voltage is off...
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7208919 |
Method and apparatus for digitally regulating an output voltage using noise-shaped component selection
Provided is a digitally-controlled linear regulator having noise-shaped component selection. The digitally-controlled linear regulator has a regulated-voltage sensor, a comparator module, a...
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7183752 |
Connection method for a static VAR compensator
A static VAR compensator has several parallel compensation components (K 1 –K 3 ). To connect the static VAR compensator to an operating voltage (U) the compensation components (K 1 –K 3 ) are...
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7002321 |
Automatic power factor correction using power measurement chip
An automatic power factor correction system, for an electrical power installation drawing varying levels of reactive power, measures an electrical parameter of the power drawn by a load of a power...
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6954046 |
Method and apparatus to control input to AC induction motors
One embodiment of the present invention is a method to control input to an alternating current (AC) induction motor from a power supply that includes steps of: (a) determining a measure of reactive...
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6930459 |
Method for reducing the influence of a DC current component in the load current of an asynchronous motor
A method with which the load current and thus the load moment of an asynchronous motor that is controlled via a phase-controlled two-phase thyristor power controller, can be easily influenced so as...
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6917188 |
Power converter circuitry and method
A switching power supply controller coupled to a first switching power supply circuit and a second switching power supply circuit, the controller sensing voltages provided to the first switching...
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6868293 |
System and method for energy usage curtailment
A system and method are disclosed for performing energy usage management within a network. The system may include an energy management system, such as a thermostat device, that may be associated...
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6856120 |
Regulator circuit
A regulator circuit capable of reducing an increase in an output voltage during a sudden drop in a load current without increasing the power consumption during a steady state. When a current in...
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6847183 |
Electronic power supply for a synchronous motor with permanent-magnet rotor having two pairs of poles
A low noise synchronous motor including a permanent-magnet rotor and a stator with at least two pairs of stator poles and corresponding winding further includes an electronic power supply...
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6700358 |
Automatic power factor correction system
An automatic power factor correction system, for an electrical power installation drawing varying levels of reactive power, measures an electrical parameter of the power drawn by a load of a power...
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6661207 |
Apparatus and method for protecting synchronous generators against off-nominal frequency deviation and alternating forces excitation
An apparatus and method for protecting synchronous generators against off-nominal frequency deviation and alternating forces excitation is provided. Particular application can be found with...
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6559622 |
System for preventing overreach of protection for series compensated power lines
The system includes an enable signal applied to an output AND element. A comparator compares the voltage ratio of selected measured and calculated phase-to-phase or single phase voltages against a...
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6519537 |
Apparatus providing on-line indication of frequency of an AC electric power system
Apparatus for determining the frequency of an ac power signal, includes sensing circuitry to sense the ac signal. In a digital implementation of the invention, a double average of the samples is...
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6297940 |
Protection system for devices in an electrical distribution network
A computer-implemented protection system is used in a multi-phase electrical distribution network. The system includes a sensor operable to measure an impedance of a device connected to a phase of...
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6285169 |
Sag generator with switch-mode impedance
A voltage sag generator for alternating current power systems intentionally creates power quality disturbances. The sag generator has a switch-mode impedance between its input and its output....
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6191563 |
Energy saving power control system
Apparatus and methods for AC power regulation primarily intended for inductive loads (e.g., fluorescent lights, motors, etc.) which provide substantial reduction in power consumption while also...
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6147475 |
Prediction of harmonic distortion and application of power-factor correction in AC power systems
In a method for predicting harmonic-distortion values for the application of a desired step change of capacitance to an AC system, an initial step change is applied and, from this change, a value...
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6121758 |
Adaptive synchronous capacitor switch controller
A method and apparatus are provided directed to a synchronous and adaptive capacitor switch controller for minimizing transients in the power factor correction of an electric power distribution...
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6057651 |
Lighting apparatus
A lighting apparatus includes a full-wave rectifier circuit for rectifying an AC voltage from a commercial power source, a smoothing condenser connected is series with an inductor and a diode...
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6020659 |
Ramping electronic switch system
The present invention relates to an electronic switch system for controlling AC power to a load. The switch has ON, OFF and RAMP down modes that can be selected by means of momentary touch...
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5909105 |
Control of power networks
In an apparatus for control of controller equipment for damping power oscillations in a power line, the controller equipment is serially connected between a first connection point and a second...
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5801459 |
Control equipment for a series capacitor connected into an electric power line
Control equipment (CE) for a series capacitor (1) connected into an electric power line (2) has a semiconductor valve (3), which is controllable in both directions, for connection in parallel with...
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5736838 |
High speed power factor controller
A microprocessor (42) is coupled to sense the current and voltage in an AC line (11) at a high sampling rate and to determine the power factor. In one embodiment the primary (83) of a transformer...
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5719757 |
Three-phase rectifier circuit having capacitors which are switched into the circuit dependent on the rectifier output voltage
A three-phase rectifier circuit for a capacitive load wherein only small current harmonics occur has, at the rectifier input, an inductance and a capacitor arrangement that compensates the reactive...
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5672957 |
Method and device for reducing voltage imbalances in a three-phase network by means of a static compensator
The invention relates to a method and a device for reducing imbalances (ΔV 12 , ΔV 23 , ΔV 31 ) in a three-phase network (42) by means of a static compensator. According to the invention, a...
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5670864 |
Adaptive automatic power capacitor for controlling controller a capacitor bank of a power distribution system
A power capacitor controller that adaptively and/or automatically determines a variety of operational parameters, including adaptively and automatically establishing the line phase angle correction...
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5663633 |
Touch control fan and method
A control circuit for an electrical appliance having an inductive load includes a signal conditioning element, a control element, a power conditioning element, a power adjustment element, and a...
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5654625 |
Switching circuit for a reactive power compensation device having synchronized on and off switching
Using a switching circuit (2) for a reactive power compensation device (1), he compensation capacitors of the reactive power compensation device (1) can be switched on with voltage measuring...
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5646512 |
Multifunction adaptive controls for tapswitches and capacitors
A power system relay combining the functions of tapchanger control, capacitor control, substation data monitoring and communications.
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5644214 |
Power factor correction circuit
A continuous current type power factor correction circuit in a power device having rectifying means for rectifying an alternating current, a booster converter having an inductor, a diode and a...
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5617447 |
Method of stabilizing a power supply network against reactive load fluctuations, and a reactive power compensation device
When operating, DC arc furnaces generate undesired reactive load fluctuations which are compensated without special compensation reactance by a reactive power controller. As compensation reactance,...
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5583423 |
Energy saving power control method
Apparatus and methods for AC power regulation primarily intended for inductive loads (e.g., fluorescent lights, motors, etc.) which provides substantial reduction in power consumption while also...
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5574356 |
Active neutral current compensator
An active power conditioner for mitigating zero-sequence currents in electrical distribution by items wherein a multi-phase, neutral-forming structure employs a controllable voltage source, which...
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5568042 |
Monitoring and control of a filter in a power network
In a method for monitoring and/or control of a plant component (4A, 4B, 4C, 4D) connected to an electric power network (N1, N2), for example a tunable filter for harmonic filtering or a capacitor...
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5541498 |
Distribution circuit var management system using adaptive capacitor controls
This invention provides various methods and techniques for adaptive control of pole-top capacitors to compensate for inductive customer loads along distribution lines together with control of Var...
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5535087 |
Circuit for reducing effects of transient events on electronic equipment
A circuit for reducing the effects of unpredictable changes in power supply and variations in loading on sensitive equipment, e.g. CT scanning system, to reduce inaccurate readings and protect...
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5532575 |
Multilevel converter with capacitor voltage balancing
A multilevel convertor having a set of series-connected capacitors and a set of associated series-connected switching elements employs a main control loop which controls some aspect of an AC...
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5465040 |
Three phase power factor correction device and method
In one form of the invention, a method for improving power factor in a multiple phase power distribution system coupled to a load is disclosed, comprising the steps of (a) sensing an actual voltage...
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5402058 |
Method and apparatus for controlling discharge of a thyristor-switched capacitor
A static VAR compensator (11) is connected across a power transmission line (10) and includes a capacitor (12) connected to transmission line (10). The static VAR compensator (11) includes a...
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5402057 |
System and method for coordinating shunt reactance switching
A system and method for coordinating shunt reactance switching in a system with a transformer having a primary voltage and a secondary voltage for supplying low voltage power to a load. Voltage and...
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5374853 |
Transient damping thyristor controlled series capacitor system
A thyristor controlled series capacitor (TCSC) system, including a method and apparatus, uses phase controlled firing based on monitored capacitor voltage and line current. For vernier operation,...
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5367197 |
Series capacitor equipment
Series capacitor equipment for connection into an electric power line (A) has a capacitor bank (C) and a controllable inductor connection (L, T1, T2) connected in parallel therewith and comprising...
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5349283 |
Automatic voltage control circuit by using reactive power
An automatic voltage control circuit by using reactive power is disclosed. The circuit comprises a proportional integrator, a triangular wave generator, a comparing circuit having first and second...
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5227713 |
Vernier control system for subsynchronous resonance mitigation
A subsynchronous resonance mitigation system, including a method and apparatus, for damping undesirable subsynchronous resonance oscillations in a generator, which, if left unchecked, may damage...
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