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9507results about "Reactive power adjustment/elimination/compensation" patented technology
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Method for distributed power harvesting using DC power sources
ActiveUS20080150366A1Improve reliabilitySafe operating voltageDc network circuit arrangementsPower network operation systems integrationTransverterVoltage variation
A system and method for combining power from DC power sources. Each power source is coupled to a converter. Each converter converts input power to output power by monitoring and maintaining the input power at a maximum power point. Substantially all input power is converted to the output power, and the controlling is performed by allowing output voltage of the converter to vary. The converters are coupled in series. An inverter is connected in parallel with the series connection of the converters and inverts a DC input to the inverter from the converters into an AC output. The inverter maintains the voltage at the inverter input at a desirable voltage by varying the amount of the series current drawn from the converters. The series current and the output power of the converters, determine the output voltage at each converter.
Owner:SOLAREDGE TECH LTD
System and method for resource management
InactiveUS20080172312A1Low costImprove efficiencyElectric signal transmission systemsLevel controlResource managementSystem usage
A system uses an intelligent load controller for managing use of a consumable resource at an associated load. The controller has a resource measuring component for measuring the rate of use of the resource by the associated load, including measuring at least one of an instantaneous usage rate and a usage rate over an integration period and a load status component for receiving load status data for the associated load. The controller also has a communication component for receiving control messages from and sending load status messages to other associated controllers; a memory for storing a load control goal set; and a load control computer program responsive to the resource measuring component, the load status component, the control messages from other associated controllers and the load control goal set, to determine a load operating level for, and provide control commands to, the associated load.
Owner:SYNESIOU ANDREAS JOANNI +1
Method for distributed power harvesting using DC power sources
ActiveUS8013472B2Improve component reliabilitySafe operating voltageDc network circuit arrangementsPower network operation systems integrationTransverterVoltage variation
A system and method for combining power from DC power sources. Each power source is coupled to a converter. Each converter converts input power to output power by monitoring and maintaining the input power at a maximum power point. Substantially all input power is converted to the output power, and the controlling is performed by allowing output voltage of the converter to vary. The converters are coupled in series. An inverter is connected in parallel with the series connection of the converters and inverts a DC input to the inverter from the converters into an AC output. The inverter maintains the voltage at the inverter input at a desirable voltage by varying the amount of the series current drawn from the converters. The series current and the output power of the converters, determine the output voltage at each converter.
Owner:SOLAREDGE TECH LTD
Island network and method for operation of an island network
InactiveUS20050225090A1Improve efficiencyNeed lessWind motor controlWorking fluid for enginesElectromagnetic couplingPower inverter
The invention relates to an island network with at least one energy generator, using regenerative energy sources, whereby the energy generator is preferably a wind energy plant with a first synchronous generator, a DC link, at least one first power rectifier and a power inverter, a second synchronous generator and an internal combustion engine which may be coupled with the second synchronous generator. A fully controllable wind energy unit (10) and an electromagnetic coupling (34) between the second synchronous generator (32) and the internal combustion engine (30) are provided in order to establish an island network in which the internal combustion engine can be switched off completely, so long as the wind energy unit is generating enough power for all connected users with an efficiency which is as high as possible.
Owner:WOBBEN ALOYS
Integrated closed loop control method and apparatus for combined uninterruptible power supply and generator system
InactiveUS20050012395A1Improve performanceOptimize and improveFlexible AC transmissionActive power filteringControl systemClosed loop
The present invention provides a method, computer program product, and apparatus and control system and method for providing substantially uninterrupted power to a load. The apparatus includes a control system coupled with an electrical power storage subsystem and a electrical power generator. The control system is configured to provide a plurality of modes of operation including at least a static compensator (STATCOM) mode, an uninterruptible power supply (UPS) mode and a generator mode (gen set), and to control transitions between each of the plurality of modes. In one embodiment, the control system is an integrated closed loop control system that includes a current control system and a voltage control system. The apparatus is capable of operating at least two of the plurality of modes simultaneously, including ramping the gen set mode up and simultaneously ramping the UPS mode down as the gen set mode is ramped down.
Owner:ELECTRIC POWER RES INST INC
System and method for controlling ramp rate of solar photovoltaic system
A photovoltaic (PV) control system generates a power output rate control signal based on a monitored rate of change of collective power output generated via a plurality of PV subsystems and a desired collective output power change rate for the plurality of PV subsystems and communicates the power output rate control signal to the plurality of PV subsystems to control a rate of change of one or more operating parameters of individual PV subsystems in order to control a rate of change of collective output power of the plurality of solar PV subsystems.
Owner:GENERAL ELECTRIC CO
System and method for providing collaborating power controllers
InactiveUS20110204717A1Batteries circuit arrangementsDc source parallel operationPower controllerEngineering
A method is provided in one example embodiment and includes receiving a message associated with a detection of reactive power in an energy system and inducing a first quantity of reactive power at a power level specified in the message. The first quantity of reactive power is induced in order to mitigate a second quantity of reactive power that is detected on a specific segment of the energy system. The first quantity of reactive power is induced at a local level on which a source associated with the second quantity of reactive power operates. In more specific embodiments, the message is sent in response to a sensor detecting the second quantity of reactive power, where the first quantity and the second quantity of reactive power are the same. In other embodiments, the method can include receiving a second message to stop mitigating the first quantity of reactive power.
Owner:CISCO TECH INC
System for execution of a load operating plan for load control
InactiveUS7873441B2Improve efficiency and qualityImprove stabilityElectric signal transmission systemsLevel controlComputer programReal-time computing
Owner:SYNESIOU ANDREAS JOANNI +1
Transformerless, load adaptive speed controller
InactiveUS6879053B1Emission reductionEfficient power generationEmergency protective circuit arrangementsGas turbine plantsPower inverterTransformer
The invention in the simplest form is an improved variable speed engine / generator set with an integrated power conditioning system and control method, used to generate high quality AC power with optimum fuel efficiency and reduced emissions. The variable speed generator control scheme allows for load adaptive speed control of engine and generator field. The transformerless power inverter topology and control method provides the necessary output frequency, voltage and / or current waveform regulation, harmonic distortion rejection, and provides for single phase, or unbalanced loading.
Owner:YOUTILITY
Modular charging/discharging system of power battery pack of multifunctional electromobile
InactiveCN102025182AExtend your lifeImprove charge and discharge efficiencyBatteries circuit arrangementsAc network load balancingElectric power transmissionLow voltage
The invention relates to a modular charging / discharging system of a power battery pack of a multifunctional electromobile, which aims to provide a system which can effectively meet the requirement for the bi-directional power transmission of a charging station and can exert the functions of peak clipping and valley filling as well as peak modulation and frequency modulation of a power grid. The technical scheme is as follows: the modular charging / discharging system of the power battery pack of the multifunctional electromobile comprises a charging-station monitoring system and an information management system, wherein the charging-station monitoring system is composed of a computer and a network communication system. The modular charging / discharging system is characterized by also comprising a three-phase step-down transformer, wherein the high voltage side of the three-phase step-down transformer is connected with a power grid, and the low voltage side of the three-phase step-down transformer is connected in parallel with a plurality of charging / discharging branches; each branch comprises a three-phase distribution transformer and a charging / discharging module, and the three-phase distribution transformer is connected in series with the charging / discharging module; and each charging / discharging module comprises a pulse-width modulation alternating current / direct current (PWM AC / DC) converter with the function of bi-directional power transmission, a plurality of electromagnetic isolation type DC / DC transform modules with the function of bi-directional power transmission and the information management system, and the electromagnetic isolation type DC / DC transform modules are connected in parallel.
Owner:梁一桥
Modular stacked subsea power system architectures
InactiveUS20100133901A1Dc network circuit arrangementsAc-dc conversion without reversalModularityShore
A sub-sea power delivery system includes a plurality of modular power converter building blocks on each of the power source side and the sub-sea load side that are stacked and interconnected to meet site expansion requirements and electrical load topologies. The power delivery system comprises a system DC transmission link / bus, wherein the system DC link is configured to carry HVDC or MVDC power from an onshore utility or topside power source to multiple sub-sea load modules. The stacked modular power converter topology on the sub-sea side of the sub-sea power delivery system is symmetrical with the stacked modular power converter topology on the on-shore / top-side of the sub-sea power delivery system.
Owner:GENERAL ELECTRIC CO
Super capacitor energy storage type power quality compensator
InactiveCN101807799AAvoid pollutionPrevent sensitive loads from working abnormallyElectrical storage systemReactive power adjustment/elimination/compensationPower qualityCapacitance
The invention relates to a super capacitor energy storage type power quality compensator. A system structure comprises a compensation transformer, a series compensator, a parallel compensator, a super capacitor group, a current foldback circuit, a bidirectional DC / DC chopper circuit, a signal sampling circuit, a control circuit, a drive circuit, a human-computer interface and corresponding auxiliary circuits, which form a three-phase three-wire system topological structure. By utilizing the excellent characteristics of great power density, high charging and discharging speed and long cycle life of a super capacitor, the super capacitor energy storage type power quality compensator is matched with the DC / DC chopper circuit to form an energy storage control system which plays the roles of adjusting power and stabilizing the voltage of a direct current bus in work. The invention also has the functions of dynamic voltage recovery, active filter and reactive compensation and can ensure that a load can obtain rated sine voltage and the current of a grid is sine current with the same direction (unit power factor) with that of a voltage fundamental wave positive sequence active component, thereby comprehensively improving the quality of power. The invention has positive generalization and application value for both the public grid and users.
Owner:TIANJIN UNIV
Integrated method for realizing parallel operation power generation and power network reactive power compensation simultaneously
InactiveCN1523726AIncrease output powerImprove conversion efficiencySingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationDc currentEngineering
An integral method for realizing parallel generation and network reactive power compensation at the same time is based on the transient reactive power theory applying park transfer to transform a three phase inverter output current to a rotation dq coordinate to realize separation of active current and reactive current to convert the DC current of the photovoltaic to AC current by controlling the currents and directions carry out reactive power compensation to the local network. When a photovoltaic battery has enough energy to output, it realizes parallel generation and reactive compensation at the same time, when it stops the output, the inverter compensates the network independently.
Owner:SHANGHAI ELECTRIC POWER ELECTRONICS
Method and apparatus for distributed var compensation
ActiveUS20090200994A1Single network parallel feeding arrangementsDc source parallel operationControl signalPeak value
A method and apparatus for generating on-demand power. The method comprises receiving a peak reactive current request, generating a control signal based on the peak reactive current request, and utilizing the control signal to drive a DC / AC inverter to generate reactive power commensurate with the peak reactive current request.
Owner:ENPHASE ENERGY
Dynamic reactive compensation system and method
InactiveUS20050194944A1Attenuating rapid voltage variationTrend downReactive power adjustment/elimination/compensationReactive power compensationPower compensationControl signal
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 device; a capacitor system configured to transfer capacitive reactive power between the utility power network and the capacitor system; an electro-mechanical switch for connecting and disconnecting the capacitor system to the utility power network; an interface associated with the electro-mechanical switch; a controller configured to provide control signals for controlling the electro-mechanical switch; and a communication channel for coupling the controller to the interface associated with the electro-mechanical switch. The electro-mechanical switch, interface, controller, and communication channel together are configured to connect or disconnect the capacitor system from the utility power network within about three line cycles or less of the nominal voltage frequency when a fault condition is detected on the utility power network.
Owner:AMERICAN SUPERCONDUCTOR
Continuous reactive power support for wind turbine generators
Real and reactive power control for wind turbine generator systems. The technique described herein provides the potential to utilize the total capacity of a wind turbine generator system (e.g., a wind farm) to provide dynamic VAR (reactive power support). The VAR support provided by individual wind turbine generators in a system can be dynamically varied to suit application parameters.
Owner:WILKINS THOMAS ALEXANDER +1
Distributed floating series active impedances for power transmission systems
ActiveUS20050073200A1Reduce congestionGuaranteed normal transmissionFlexible AC transmissionBatteries circuit arrangementsElectric power transmissionElectric power system
Floating electrically isolated active impedance modules are formed to attach to power transmission lines without breaking the lines such that the power line forms a secondary of the main transformer of the module. Each module includes an electrical energy storage device and a switching circuit, such as a single phase inverter, connected to the storage device and to the main transformer primary winding. The inverter can be controlled to couple a selected voltage to the transmission line through the main transformer primary winding which can provide effective positive impedance, negative impedance, or a voltage at or near phase quadrature with the line current. Many active impedance modules may be distributed over a power system grid to allow control of the impedance of the power lines in the grid and to steer power through the grid, with each module electrically isolated from ground and from other phase lines of the transmission system.
Owner:SOFT SWITCHING TECH
Active power filter including power unit and its control method
InactiveCN101051751ASolve control problemsSolve the inrush currentActive power filteringAc-dc conversionCapacitanceEngineering
The power unit includes H bridge inverter circuit, capacitance in DC section connected to DC bus in inverter circuit, and control circuit for controlling operation of the power unit. The power unit also includes a clipping energy consumption circuit. Combining a small quantity of active power absorbed by active electric power filter, the method realizes controlling DC bus voltage of power unit. The active electric power filter includes following parts: inverter with each phase including at least one power unit; voltage detection circuit, central control system, filtering circuit, precharge circuit, income line switch, interface and communication circuit, and cooling unit etc.
Owner:上海艾帕电力电子有限公司
Multi-level medium voltage data center static synchronous compensator (dcstatcom) for active and reactive power control of data centers connected with grid energy storage and smart green distributed energy sources
Systems and methods for supplying power (both active and reactive) at a medium voltage from a DCSTATCOM to an IT load without using a transformer are disclosed. The DCSTATCOM includes an energy storage device, a two-stage DC-DC converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus. The DC-DC converter may include two stages in a bidirectional configuration. One stage of the DC-DC converter uses a flying capacitor topology. The voltages across the capacitors of the flying capacitor topology are balanced and switching losses are minimized by fixed duty cycle operation. The DC-DC converter generates a high DC voltage from a low or high voltage energy storage device such as batteries and / or ultra-capacitors. The multi-level, neutral point, diode-clamped inverter converts the high DC voltage into a medium AC voltage using a space vector pulse width modulation (SVPWM) technique.
Owner:INERTECH IP
Dynamic reactive compensation system and method
InactiveUS7091703B2Prevent voltage collapseProvide quicklyReactive power adjustment/elimination/compensationReactive power compensationPower compensationControl signal
Owner:AMERICAN SUPERCONDUCTOR
Mixed type power quality controlling device
ActiveCN101924370ASuppress fluctuationsLow costFlexible AC transmissionActive power filteringCapacitanceHybrid type
The invention discloses a mixed type power quality controlling device comprising an active part and a passive part, wherein the active part comprises active power filters (APFs) and static var generators (SVGs), the SVGs are used for supplying transient reactive power, and the APFs are used for filtering harmonic waves; the number of the APFs and the SVGs is at least two groups, and the APFs and the SVGs are connected with a three-phase power grid in parallel through a transformer isolation mode; the passive part comprises a static var compensator (SVC) which is used for supplying steady-state var power, wherein the SVC comprises a thirstier switching capacitor (TSC), a thirstier control reactor (TCR), and a fixed capacitance compensator (FC); the TSC, the TCR and the FC are directly connected with the three-phase power grid, the TSC is used for supplying high-capacity capacitive var power, the FC is used for supplying low-capacity var power and is also used as a main subharmonic filtering branch circuit to carry out harmonious comprehensive compensation and harmonic control on a power system.
Owner:ZHUZHOU NAT ENG RES CENT OF CONVERTERS
Energy-saving type cascade multilevel photovoltaic grid-connected generating control system
InactiveCN101917016AControl powerEliminate random fluctuationsActive power filteringSingle network parallel feeding arrangementsHigh voltageHarmonic voltages
Owner:BEIJING JIAOTONG UNIV
An energy-feedback type traction power supply device and its control method
ActiveCN102267405ARealize stepless adjustmentInjected harmonics are smallPower supply linesSingle network parallel feeding arrangementsTransformerLow voltage
The invention discloses an energy feeding type dragging power supply device and a control method thereof. The energy feeding type dragging power supply device comprises a multiple transformer and at least two four-quadrant converter modules. The energy feeding type dragging power supply device and a diode rectification dragging unit are arranged in parallel form. A primary side of the multiple transformer of the energy feeding type dragging power supply device is connected to an alternated current medium-voltage power grid through a high-voltage switch cabinet; each set of windings at a low-voltage side of the multiple transformer is connected to an alternated current side of one four-quadrant converter module; and the direct current sides of the four-quadrant converter modules are in parallel connection after being connected to a direct current side isolation switch and are connected to a direct current bus through a direct current switch cabinet and a cathode cabinet. The energy feeding type dragging power supply device can work at three different modes of dragging, feedback or SVG (Scalable Vector Graphics) according to the requirements. The energy feeding type dragging power supply device is compatible with an existing dragging power supply system under the condition of meeting a power grid compatibility demand. The energy feeding type dragging power supply device has the advantages of moderate cost, capability of solving the technical problems of feeding back a regenerated braking energy and stabilizing a dragging network voltage, and real-time static reactive power compensation capacity.
Owner:ZHUZHOU CSR TIMES ELECTRIC CO LTD
Reactive power compensation in solar power system
ActiveUS20100067271A1Active power filteringConversion with intermediate conversion to dcPower compensationPower grid
A method of providing reactive power support is proposed. The method includes detecting at least one of a plurality of network parameters in a distributed solar power generation system. The generation system includes a plurality of photovoltaic modules coupled to a grid via inverters. The method further includes sensing a state of the photovoltaic modules coupled to the distributed solar power generation system and determining a reactive power measure based upon the sensed state and the detected network parameters. The reactive power measure is used to generate a reactive power command. The reactive power command is further used to compensate reactive power in the distributed solar power generation system.
Owner:GENERAL ELECTRIC CO
Distributed floating series active impedances for power transmission systems
ActiveUS7105952B2Reduce congestionEfficient powerFlexible AC transmissionBatteries circuit arrangementsElectric power transmissionTransformer
Floating electrically isolated active impedance modules are formed to attach to power transmission lines without breaking the lines such that the power line forms a secondary of the main transformer of the module. Each module includes an electrical energy storage device and a switching circuit, such as a single phase inverter, connected to the storage device and to the main transformer primary winding. The inverter can be controlled to couple a selected voltage to the transmission line through the main transformer primary winding which can provide effective positive impedance, negative impedance, or a voltage at or near phase quadrature with the line current. Many active impedance modules may be distributed over a power system grid to allow control of the impedance of the power lines in the grid and to steer power through the grid, with each module electrically isolated from ground and from other phase lines of the transmission system.
Owner:SOFT SWITCHING TECH
Reactive power controller for controlling reactive power in a wind farm
A reactive power controller for controlling reactive power in a wind farm grid connected to a utility grid and including at least two sub-grids and a collector portion is provided. At least one wind turbine is connected to each sub-grid, wherein the at least two sub-grids are connected to the collector portion and wherein the collector portion establishes the connection to the utility grid. The reactive power controller includes a device for determining an actual reactive power value at the collector portion, and a wind farm controller operatively connected to the device for controlling at least one of said wind turbines on basis of the determined actual reactive power value such that a desired reactive power value is attained.
Owner:GENERAL ELECTRIC CO
Voltage source converters operating either as back-to-back stations or as parallel static var compensators
InactiveUS6411067B1Powerful control of the flow of electric power in the transmission lineReduce power consumptionFlexible AC transmissionElectric power transfer ac networkBuck converterVoltage source inverter
A device and a method for controlling the flow of electric power in a transmission line carrying alternating current, in which a first voltage source converter is connected to the transmission line at a first point and a second voltage source converter is connected to the transmission line at a second point. Further, the first and second voltage source converters have their direct current sides connected to a common capacitor unit. Also included is a by-pass switch connected to the transmission line between the first point and the second point in parallel with the first and second voltage source converters so that the first and second voltage source converters will operate as a back-to-back station when the by-pass switch is open and as two parallel static var compensators when the by-pass switch is closed.
Owner:ABB POWER GRIDS SWITZERLAND AG
Subsynchronous damping control system for effectively inhibiting subsynchronous resonance and oscillation
InactiveCN101615791AReduce torsional vibration fatigue lossSolve Oscillation ProblemsReactive power adjustment/elimination/compensationElectric generator controlModal filterMode control
The invention discloses a subsynchronous damping control system for effectively inhibiting subsynchronous resonance and oscillation, belonging to the technical field of stableness and control of the electrical power systems. The system comprises a rotary speed checking pre-processor, a combined mode filter, a combined proportion phase shifter, a mode control signal synthesizer, a subsynchronous compensating current command calculator, a current beat controller and a DC / AC convertor. The invention inhibits shafting torsional vibration by injecting subsynchronous / supersynchronous current complementary with machine set shafting modal frequency, and can simultaneously inhibit multiple torsional vibration modals, so that the invention has comprehensive function, can solve the multi-modal subsynchronous resonance and oscillation problems of the electrical power system, improves the supersynchronous stability of the system and lowers shafting torsional vibration fatigue loss of a high-rating generator.
Owner:TSINGHUA UNIV
Modularized multi-level converter with auxiliary diode
InactiveCN102832841ASimple structureSimplify the control problemActive power filteringAc-dc conversionCapacitor voltageHigh pressure
The invention relates to a modularized multi-level converter with an auxiliary diode. The modularized multi-level converter comprises a three-phase valve body, and three active energy feedback circuits respectively connected to the three-phase valve body, wherein each phase of valve body comprises 2M half-bridge inversion units and 2M-1 auxiliary diodes; direct current capacitors of the 1-(2M-1)th serially connected half-bridge inversion units are respectively connected with one auxiliary diode, and the final (2M)th half-bridge inversion unit is serially connected to form the valve body; the 1-Mth half-bridge inversion units form the upper-half part of the valve body to output a negative polarity voltage; and the (M+1)th to 2Mth half-bridge inversion units form the lower-half part of the valve body to output a positive polarity voltage. The auxiliary diodes and the active energy feedback circuits form a capacitor voltage sharing loop, the modularized multi-level converter realizes capacitance self voltage sharing effect, and realizes that the unit capacitance voltage is measured by using less direct current voltage sensors, thus the detection and the control of multi-level topology are greatly simplified. The modularized multi-level converter can be used in occasions such as reaction compensation and harmonic treatment of a medium-voltage or high-voltage power grid.
Owner:TSINGHUA UNIV
Active and reactive coordination control method for permanent-magnet direct-driven wind turbines in low-voltage ride-through process
InactiveCN102664427AReduce active power lossDC voltage fluctuation is smallSingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationDC - Direct currentRotor (electric)
Enclosed is an active and reactive coordination control method for permanent-magnet direct-driven wind turbines in the low-voltage ride-through process. Two different control strategies are employed for a grid side converter according to amplitude change of power grid voltage: when the power grid voltage is in a normal state, the grid side converter is in an active-priority maximum power tracing control mode so that the wind turbines capture wind energy to the maximum extent; when the power grid voltage is beyond the normal range, the grid side converter is in an active priority control mode so that the dynamic reactive current which is injected into an electricity system meets the requirements of grid combining. An engine side converter is in a direct-current voltage control mode based on rotor energy storage, power unbalance of the direct-current side of the engine side converter is relieved and the direct-current voltage is stabilized by utilizing the self rotating speed of the permanent-magnet direct-driven wind turbines and the change of the kinetic energy. The active and reactive coordination control for the wind turbines before or after the sudden change of the power grid voltage is realized according to the amplitude change of the power grid voltage, the fluctuation of the direct-current bus voltage is restrained by releasing or storing the rotor kinetic energy, so that the low-voltage ride-through capability of the permanent-magnet direct-driven wind turbines is improved, reactive power support is rapidly and accurately provided for the power grid, and certain support is given to restoration of the power grid voltage.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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