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289 results about "Reactive control" patented technology
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First, reactive control is necessarily linked to contextual processes engaged during the cue, thus the reactive control measure is inherently confounded by the degree to which proactive processes are engaged. This might attenuate reactive activity in controls due to their intact proactive processes.
Intra-area master reactive controller for tightly coupled windfarms
ActiveUS20100025994A1Wind motor controlLoad balancing in dc networkElectric power systemPower factor
A wind turbine generator control system is provided for controlling output of a plurality of tightly-coupled windfarms connected at a point of common coupling with a power system grid. A master reactive control device employs algorithms whose technical effect is to coordinate the real power, reactive power and voltage output of the multiple windfarms. The controller incorporates a reactive power regulator that can be used to regulate reactive power, power factor or voltage at the point of common coupling and an active power regulator that can be used to regulate real power at the point of common coupling; such that each windfarm is not asked to contribute or violate its own operating capability.
Owner:GENERAL ELECTRIC CO
Microgrid and microsource control method based on virtual synchronous electric generator
ActiveCN103972928AAvoid shockEnhancing capacity to embrace renewable energyEnergy industrySingle network parallel feeding arrangementsVirtual synchronous generatorGrid-tie inverter
The invention provides a microgrid and microsource control method based on a virtual synchronous electric generator. The method comprises the following steps of building a mechanical equation and an electromagnetic equation of the virtual synchronous electric generator, carrying out microsource active control through active adjustment of the virtual synchronous electric generator, carrying out microsource reactive control through reactive adjustment of the virtual synchronous electric generator and achieving seamless switching between different operating modes of a microgrid. The microgrid and microsource control method based on the virtual synchronous electric generator has the active and reactive adjustment capacity similar to that of the synchronous electric generator, can simulate the inertia and the damping characteristic of the synchronous electric generator, can overcome the impact on a power grid from inertialessness of a traditional grid-connected inverter, and can effectively improve the capacity of the power grid to accept the renewable energy sources.
Owner:STATE GRID CORP OF CHINA +1
Model prediction control-based active and reactive coordinated control method of power distribution network
ActiveCN106786806AReduce lossLow running costSingle network parallel feeding arrangementsModel predictive controlInstruction sequence
The invention discloses a model prediction control-based active and reactive coordinated control method of a power distribution network. The method comprises the steps of (1) building a recent optimization and control model according to an optimization object and constraint conditions; (2) solving the recent optimization and control model and making a recent active and reactive control plant of the power distribution network; (3) taking a recent active and reactive control plan of the power distribution network as a reference value, considering current and future running constraint conditions on the basis of a running state measurement value of the power distribution network at a current moment, building a prediction model and an active and reactive coordinated optimization and control model at an intra-day rolling correction stage by and solving an intra-day active and reactive control instruction sequence in a limited period in the future; and (4) executing an intra-day active and reactive control instruction at a first moment, moving a time window backwards at a time interval and repeating the intra-day rolling correction optimization process. According to the method, the running cost of a system is reduced on the premise of ensuring the running security of the system, the network loss of the system is reduced, and maximization of the running benefit of the active power distribution network is achieved.
Owner:JIANGSU ELECTRIC POWER CO +2
Intra-area master reactive controller for tightly coupled windfarms
A wind turbine generator control system is provided for controlling output of a plurality of tightly-coupled windfarms connected at a point of common coupling with a power system grid. A master reactive control device employs algorithms whose technical effect is to coordinate the real power, reactive power and voltage output of the multiple windfarms. The controller incorporates a reactive power regulator that can be used to regulate reactive power, power factor or voltage at the point of common coupling and an active power regulator that can be used to regulate real power at the point of common coupling; such that each windfarm is not asked to contribute or violate its own operating capability.
Owner:GE INFRASTRUCTURE TECH INT LLC
Control method of alternating voltage sensorless high voltage direct current transmission converter
InactiveCN101882799AReduce the numberAvoid structural formsSingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationControl signalReactive power theory
The invention discloses a control method of an alternating voltage sensorless high voltage direct current transmission converter, belonging to the technical field of electrical equipment and comprising the following steps: establishing a stator resistor and an inductor for a virtual motor; building relative position relationships among a current vector, a voltage vector and a flux linkage vector, and analyzing a vectorgram; establishing a converter and flux linkage mathematic model, and calculating a virtual flux linkage vector of a system to obtain a power feedback quantity of the system; acquiring an active control signal and a reactive control signal of the system through a direct power control algorithm, and generating a PWM trigger converter for respectively and independently controlling the active power and reactive power of the system; and utilizing MATLAB simulation software to set up a system model for verifying, and obtaining a systematic selection device when the verification is successful. By utilizing Matlab / Simulink to set up a corresponding simulation model, the designed method is verified to have rapid response speed, the voltage and power after startup can still reach stable values after about 2 power frequency periods and have high steady state precision.
Owner:SHANGHAI JIAO TONG UNIV
System, methods and apparatus for managing a weapon system
InactiveUS20050183569A1Sustains the moral responsibility necessaryOvercome limitationsAutonomous decision making processRemote controlled aircraftControl layerControl system
A system for managing a weapon system is provided. The system includes a number of mobile robotic vehicles (MRVs), a number of squads, each squad having a lead MRV and member MRVs, a number of central control systems, a number of reactive control systems, a central planning control configured to control the plurality of central control systems, a behavior-based reactive control configured to control the plurality of reactive control systems, an intermediated control layer configured to control the central planning control and the behavior-based reactive control, a number of hybrid control models configured to communicate with the intermediate control layer, the hybrid control models including a planning driven model and an adaptation model, a number of synthetic control models configured to communicate with the hybrid control models, and a number of synthetic hybrid control models configured based on combinations of the hybrid control models and the synthetic control models.
Owner:SOLOMON RES
Island detection method of high-power photovoltaic grid-connected converter
ActiveCN102437587AStable powerImprove securityElectrical testingSingle network parallel feeding arrangementsPower qualityEngineering
The invention discloses an island detection method of a high-power photovoltaic grid-connected converter. The method comprises the following steps of: determining whether a system operates at a grid-connected power generation state, and starting up an island detection algorithm instantly if the system is at the grid-connected power generation state; detecting whether the frequency of the voltage of a port power grid is within the normal range in real time, if the frequency is not within the normal range, considering that the system is at the island state, and carrying out automatic safety stop on the system; adding reactive current Iqdisturb with the duration of td periodically within the normal range; and superposing the reactive current Iqdisturb and reactive control Icqset of the converter, thus an axis q component reference Icqref of grid-connected current of the converter is formed finally. The contradiction between two aspects of reliability of detection and the quality after grid-connected electric energy reduction for the traditional island detection algorithm is effectively solved by the method provided by the invention, and the implementation method is simple and effective.
Owner:WUHAN NEW ENERGY INST OF ACCESS EQUIP & TECH
Reactivity control in substituted diacetylenic monomer shelf life monitoring systems
InactiveUS6924148B2Accurately controlled extension and shiftingEasy to controlInvestigating time/temperature historyThermometerTime to effectMonitoring system
A product shelf life monitoring system comprising an active substituted diacetylenic monomer component indicator composition is responsive to an integral of varying temperature over time to effect a solid state polymerization in the active monomer which results in a visible change in color density or the like at a rate designed to closely approximate the degradation, or shelf life, of an associated foodstuff or medicament product. The reactivity of the monomer component upon which the time-temperature integral of the indicator composition, and thus the represented shelf life, primarily depends may be readily varied by refluxing a solution of the monomer in a selected solvent for a predetermined time prior to recrystallization of the monomer for incorporation into the indicator composition.
Owner:TEMPTIME CORP
Electric voltage idle-work fast control method of speed-changing constant frequency wind generator group wind power station
ActiveCN101272117AAvoid deficienciesAvoid excessSingle network parallel feeding arrangementsWind energy generationElectricityConstant frequency
A voltage reactive power fast control method for the wind power station of a variable-speed constant-frequency wind-power machine group, which comprises the following steps: 1, converting the voltage of an access node of the wind power station; 2, judging and selecting a reactive control mode; 3, establishing a reactive compensation scheme of the wind power station; 4, establishing a reactive compensation distribution scheme of the wind-power machine group; 5, sending a reactive control command; 6, triggering the next control by judging and controlling timelag. The method takes the voltage of the access node of the wind power station as an object of regulation and control; takes the steady-state operation voltage of the access node of the wind power station as a target of regulation and control; comprehensively considers the coordination between the wind power station and an electric network to carry out uniform planning of the reactive compensation of the whole wind power station, so as to lead all the machine groups in the wind power station to be capable of reasonably adjusting the reactive power, thus ensuring the reactive compensation of the whole station to be sufficient, preventing the wind-power machine group from acting frequently under the situation of real time changing of the voltage of the electric network, realizing reactive fast control and being help for maintaining the voltage stabilization of the electric network of an access area.
Owner:NARI TECH CO LTD +1
Isolated island micro-grid layered distribution type control strategy based on consistency theory
ActiveCN109687526AQuick responseStable voltageSingle network parallel feeding arrangementsResourcesPower controllerInner loop
The invention provides an isolated island micro-grid layered distribution type control strategy based on a consistency theory. The isolated island micro-grid layered distribution type control strategycomprises the steps: firstly, a primary droop control strategy is proposed, a distribution type multi-loop controller based on droop control is designed and comprises an outer loop power controller and an inner loop voltage and current controller, distribution type power supply quick response is achieved, and the system voltage and frequency are stabilized; then based on a finite time consistencyalgorithm, a translational droop curve method and a voltage-reactive droop coefficient correcting method, distribution type secondary frequency control and secondary voltage-reactive control strategies are proposed, frequency and voltage deviations caused by primary droop control are corrected, and reactive power proportional distribution is achieved; and finally, an economic dispatching model isbuilt by considering the optimal total power generating cost of a micro-grid system as a target, solving is carried out by adopting a Lagrangian dual decomposition method, an isolated island micro-grid distribution type economic dispatching method is further proposed based on the finite time consistency algorithm, and thus the optimal output active power of all distribution type power supplies isindependently solved locally.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
System and method for environmental adaptation of display characteristics
A system and method for altering the characteristics of a display based on environmental data is disclosed. Exemplary embodiments provide a light sensor, an environmental processing unit which is adapted to receive electrical signals from the light sensor and generate an environmentally-reactive control signal (Sa), an image signal processor which accepts Sa and an encoded image signal (Se) and generates a pre-decoding image signal (Sp), and an image signal decoder which accepts Sp and generates a decoded image signal for the display. The environmentally-reactive control signal (Sa) may contain the instantaneous value of the desired display black level Sb. Alternatively or additionally, the environmentally-reactive control signal (Sa) may contain a signal linearity modification value.
Owner:MFG RESOURCES INT INC
Microjet actuators for the control of flow separation and distortion
A system for controlling unwanted flow separation. One or more microjets are placed to feed auxiliary fluid into a region of suspected flow separation. If the separation is intermittent, sensors can be employed to detect its onset. Once separation is developing, the microjets are activated to inject a stream of fluid into the separation region. This injected fluid affects the flow and serves to control the flow separation. A steady-state embodiment can be used to continuously fluid. On the other hand, sensors and a rapidly reactive control circuit can be used to inject fluid only when it is needed to inhibit flow separation. The sensors and control circuit can operate off of simple pressure gradient detection or predictive algorithms that anticipate when flow separation will occur.
Owner:FLORIDA STATE UNIV RES FOUND INC
Passive safe cooling system
InactiveCN104361914AImplement exportLow costNuclear energy generationEmergency protection arrangementsNuclear engineeringNuclear power
The invention discloses a passive safe cooling system. The system comprises a water replenishing tank, an advanced safe filling tank, a built-in material replacing water tank, a pressure releasing system, a passive emergency water supply system and a passive safety shell cooling system, wherein the water replenishing tank, the advanced safe filling tank, the built-in material replacing water tank and the pressure releasing system are all arranged inside a safety shell and respectively communicated with a pressure container; the passive emergency water supply system hermetically penetrates through the safety shell, corresponds to a steam generator arranged inside the safety shell and is used for realizing water supply reflowing and heat output of the steam generator; the passive safety shell cooling system hermetically penetrates through the safety shell so as to output the heat out of the safety shell. Without intervention of a passive system and an operator, the passive safe cooling system disclosed by the invention can be used for effectively realizing safety functions such as reactor core reactivity control, afterheat output and radioactive substance containment under accident conditions and ensuring that a reactor core can be cooled effectively and maintained in a safe shutdown state, so that the safety of a nuclear power station is improved and the building cost and operating cost of the nuclear power station are also greatly lowered.
Owner:CHINA NUCLEAR POWER TECH RES INST CO LTD +2
Multi-end flexible direct current power transmission system level coordination control device
ActiveCN104578187AAdjust the tidal current distributionPrevent overloadReactive power adjustment/elimination/compensationReactive power compensationOperation modeCell controller
The invention discloses a multi-end flexible direct current power transmission system level coordinate control device which comprises a data collecting module, a data processing module, a control function processing module, a communication management module and a redundancy control module. The data collecting module is responsible for process data collection and data collection of analog quantities such as state signals, voltage and current and generates input data needed by the control function processing module. The control function processing module comprises an active control module, a reactive control module, a direct-current voltage control module, a VF control module and the like, finally, reference value signals of voltage, active power, reactive power, frequency and the like of a converter station are generated, the reference value signals are sent to a converter station unit controller through the communication management module to complete a system control target. The multi-end flexible direct current power transmission system level coordinate control device can conduct emergent operation control which includes conversion of the system operation mode and the control mode, emergent running stopping and locking control under some faults, fault switching of a redundant system, resetting operation control after alarming or protecting actions and the like, and the reliability of integrated design of the system is improved.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
Wind farm reactive voltage control method
ActiveCN102969722ARealize coordinated controlSuppress bus voltage fluctuationAc network voltage adjustmentReactive power compensationElectricityPower compensation
The invention discloses a wind farm reactive voltage control method. The method comprises steps of (1), measuring wind farm synchronization point voltage; (2), determining whether the wind farm synchronization point voltage meets requirements of a grid; (3), calculating system impedance; (4), calculating the reactive target value of the wind farm synchronization point; (5), determining whether all wind generation sets and all reactive power compensation devices meet preset protection restriction conditions; (6), primarily distributing the reactive target value between wind generation sets and reactive power compensation devices; (7), secondarily distributing results of the primary distribution; (8), transmitting reactive control commands to wind generation sets and reactive power compensation devices; and (9), returning to the step (1) after wind generation sets and reactive power compensation devices execute commands. The wind farm synchronization point voltage serves as a control target, the reactive power of the wind farm serves as an adjusting amount, the reactive power output of the wind farm synchronization point can meet change of system load and grid voltage requirements and the wind farm synchronization point voltage keeps stable.
Owner:NARI NANJING CONTROL SYST
Protection method and system for digitalized instrument control diversity of nuclear power station
InactiveCN103400623ARealize the operationMeeting Defense in Depth RequirementsPower plant safety arrangementNuclear energy generationNuclear powerNuclear engineering
The invention discloses a protection method for digitalized instrument control diversity of a nuclear power station. The method comprises the following steps that a diverse actuation system (DAS) is used for obtaining a common cause failure (CCF) which is formed by overlapping abnormal working status of the nuclear power station; the DAS is used for driving manual control on operation and control of a key safe function in the CCF, the key safe function comprises at least one of reaction control, waste heat elimination, a reactor coolant device, containment isolation and containment integrity; if the operation and control of the key safe function can not be subjected to the manual control according to the requirement of response time, the DAS is used for implementing automatic driving operation. According to the protection method for the digitalized instrument control diversity of the nuclear power station, occurrence of the CCF can be effectively prevented. Additionally, the invention further discloses a protection system for the digitalized instrument control diversity of the nuclear station.
Owner:中广核工程有限公司 +1
Control method for improving reliability of AVC (Automatic Voltage Control) system of electric power monitoring center
InactiveCN103312040AReduce the number of movementsGuaranteed uptimeAc network voltage adjustmentInformation technology support systemClosed loopOptimal control
The invention provides a control method for improving reliability of an AVC (Automatic Voltage Control) system of an electric power monitoring center. The control method comprises the steps of performing real-time telemetry data processing; performing real-time remote signaling data processing and dead data processing; and determining the data as dead data, locking a corresponding reactive voltage regulating device and sending alarm signals when the AVC system detects that telemetry information is not refreshed for a long time. The control method for improving the reliability of the AVC system of the electric power monitoring center has the advantages of achieving optimal control and closed loop operation of reactive voltage of the integral grid due to the fact that centralized monitoring, unified management and online control are performed on an on-load voltage regulating device and a reactive compensation device of every power substation in a power grid and ensuring that the AVC system enables a voltage reactive control strategy to be optimized, reducing the times of once action of the reactive voltage regulating device, improving the service life of the device and providing the corresponding technical support for improvement of the reactive voltage management level and safe, stable and high quality operation of the integral power grid due to the fact that the AVC system still relies on real-time data collected through an SCADA (Supervisory Control And Data Acquisition) system to calculate to a great extent.
Owner:STATE GRID CORP OF CHINA +1
Reactivity control method of pebble-bed high-temperature gas cooled reactor and telescopiform control rod
ActiveCN103456374ASimplify the startup processReduced feature requirementsNuclear energy generationNuclear reaction controlEngineeringReflective layer
Owner:TSINGHUA UNIV
Power coordination control method based on direct-drive wind-turbine-generator wind farm
InactiveCN102801181AImprove output performancePrevent or avoid shockSingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationElectricityControl signal
The invention discloses a power coordination control method based on a direct-drive wind-turbine-generator wind farm. The power coordination control method is characterized in that the voltage of the wind farm is detected to judge whether the condition of starting a wind farm power coordination control mode is met; when the condition is not met, wind turbine generators in the wind farm adopt normal control modes, and when the condition is met, the wind farm is in the power coordination control mode; and the active and reactive control amounts of the wind farm are figured out in the power coordination control mode and then are distributed to single wind turbine generators in the wind farm to serve as control signals to adjust the output of the power of the single wind turbine generators, and further, the closed-loop control on bus bar voltage of the wind farm is realized. The capacity of adjusting the reactive power of the wind farm is improved to maintain the voltage level at an outlet of the wind farm, thereby preventing or avoiding higher impact on a power grid, and guaranteeing the continuous and stable operation of the wind farm; and the power coordination control method can perform reasonable coordination control on the active and reactive power generation of the wind farm and effectively provide reactive power support for the voltage at the outlet of the wind farm, so that the voltage stability at an access point is maintained.
Owner:STATE GRID CORP OF CHINA +2
Voltage reactive real-time control system of regional power grid and enclosed loop control method thereof
ActiveCN102255320AQuality assuranceReduce network lossReactive power adjustment/elimination/compensationReactive power compensationReal-time Control SystemLoop control
The invention discloses a voltage reactive real-time control system of a regional power grid and a control method thereof. The system comprises an SCADA (supervisory control ad data acquisition) system, an EMS (enhanced massage service) system, a power grid simulation system and a power grid test system, wherein the SCADA system is connected with a power system; the EMS system is connected with the SCADA system; the power grid simulation system is connected with the SCADA system, and is used for finishing the simulation of voltage reactive real-time control of the power system; and the power grid test system is respectively connected with the power grid simulation system, the EMS system and the SCADA system, and is used for finishing the reactive control optimal scheme of the power system. According to the invention, nonlinearity complex behavior of the simulation power system from the aspect of full grid is performed, the generation of the final control scheme is finished by a test system, and voltage stable operation of the power system is controlled remotely or controlled through remote regulation; and the system and method have great significance in power grid stability, safety operation of power equipment and industrial and agricultural production.
Owner:ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
Net source coordination oriented large wind farm closed-loop control system
InactiveCN102646990ARealize closed-loop controlRealize controllableSingle network parallel feeding arrangementsWind energy generationElectricityTransient state
The invention discloses a net source coordination oriented large wind farm closed-loop control system, which comprises a plurality of groups of fans constituting a wind farm fleet, routers for connecting each group of fan into the fleet, a terminal, a power grid local information measuring unit, a centralized control platform and a conventional power plant; the constituting units are connected by field buses in the system to carry out data transmission, the terminal is used as a processing terminal of the fans and the centralized control platform and is connected with the centralized control platform through a bus adapter card, a controller of the centralized control platform is arranged near a wind farm booster station, the local measured information of a power grid needing measurement includes boost bus voltage and frequency, the controller sends out transient state active and reactive control signals according to measurement information and combing field grid transient state coordination control, the control signals are sent to each fan through rapid field buses to realize active and reactive rapid adjustment of the wind farm fleet. Compared with the prior art, the large wind farm closed-loop control system disclosed by the invention realizes wind farm closed-loop control, and solves the problem of coordination of wind energy net source used as an accessing power source in wind power integration.
Owner:GUIZHOU UNIV
Microgrid reactive power compensation method and system
ActiveCN102299520ARealize measurementSolving the challenges of reactive power measurementReactive power adjustment/elimination/compensationReactive power compensationPower compensationCommunication unit
The invention relates to a reactive power compensation method and a reactive power compensation system for a micro power grid. The system comprises a distributed measuring unit, a reactive power compensation control unit, a reactive power compensation unit and a communication unit. The micro power grid comprises a distributed power supply with reactive regulation output. For the micro power grid operated in an isolated network mode, the overall reactive power balance condition of the micro power grid is obtained by measuring the active and reactive power distribution conditions of each branchcircuit of the micro power grid, and a reactive power compensation device or the reactive power compensation device and the distributed power supply are subjected to reactive regulation in the micro power grid according to a specific isolated network reactive control strategy to realize the reactive power compensation of the micro power grid. The power factor of the micro power grid can be measured and corresponding reactive power compensation is performed according to the power factor when the micro power grid is operated in a grid-connected mode and in the isolated network mode.
Owner:北京四方华能电气设备有限公司
Reactivity control rod for core
InactiveUS7139352B2Prevent liquid leakageReduce the valueIntegral reactorsFuel elementsNuclear engineeringNeutron moderator
A reactivity control rod adapted to be used in a reactor core of a fast reactor and disposed at a substantially central portion of the reactor core for controlling a reactivity therein. The reactivity control rod includes a wrapper tube surrounded by a plurality of fuel rods in a reactor core, and a plurality of neutron absorber rods arranged in the wrapper tube. At least one of the plurality of neutron absorber rods includes a cladding tube and a mixture filled in the cladding tube. The mixture is composed of a neutron absorber that absorbs a neutron and a neutron moderator that moderates the neutron.
Owner:KK TOSHIBA
Method of using microjet actuators for the control of flow separation and distortion
A system for controlling unwanted flow separation. One or more microjets are placed to feed auxiliary fluid into a region of suspected flow separation. If the separation is intermittent, sensors can be employed to detect its onset. Once separation is developing, the microjets are activated to inject a stream of fluid into the separation region. This injected fluid affects the flow and serves to control the flow separation. A steady-state embodiment can be used to continuously fluid. On the other hand, sensors and a rapidly reactive control circuit can be used to inject fluid only when it is needed to inhibit flow separation. The sensors and control circuit can operate off of simple pressure gradient detection or predictive algorithms that anticipate when flow separation will occur.
Owner:ALVI FARRUKH S
Voltage reactive control method and voltage reactive control system based on reactive compensation device
ActiveCN105406482AMeeting Complexity NeedsReactive power adjustment/elimination/compensationAc network voltage adjustmentElectric power systemVoltage regulation
The invention provides a voltage reactive control method and a voltage reactive control system based on a reactive compensation device. The method comprises the following steps of determining an installation position for installing the reactive compensation device in a power distribution network branch, recording the installation position as a compensation point of the power distribution network branch; taking a head end and a tail end of the power distribution network branch as monitoring points, and monitoring voltage / current of each monitoring point and voltage / current of each compensation point; regulating capacity of the reactive compensation device at each compensation point according to the monitored voltage / current, thereby realizing voltage reactive regulation on the whole power distribution network branch. According to the invention, voltage / current of each monitoring point and voltage / current of each compensation point of the power distribution network branch are monitored, and capacity of the reactive compensation device at each compensation point is regulated according to the monitoring result, thus, voltage reactive compensation for multiple parts of the power distribution network branch is realized, and complex needs of an electric system are satisfied.
Owner:GUANGDONG POWER GRID CO LTD SHANTOU POWER SUPPLY BUREAU
System and method for environmental adaptation of display characteristics
A system and method for altering the characteristics of a display based on environmental data is disclosed. Exemplary embodiments provide a light sensor, an environmental processing unit which is adapted to receive electrical signals from the light sensor and generate an environmentally-reactive control signal (Sa), an image signal processor which accepts Sa and an encoded image signal (Se) and generates a pre-decoding image signal (Sp), and an image signal decoder which accepts Sp and generates a decoded image signal for the display. The environmentally-reactive control signal (Sa) may contain the instantaneous value of the desired display black level Sb. Alternatively or additionally, the environmentally-reactive control signal (Sa) may contain a signal linearity modification value.
Owner:MFG RESOURCES INT INC
Process employing controlled crystallization in forming crystals of a pharmaceutical
InactiveUS20050256314A1Improve filtration efficiencyImprove washing efficiencyOrganic chemistryCrystallization separationState of artCrystallization kinetics
A process is provided which employs reactive controlled crystallization to produce drug substance having desirable crystal properties which process involves providing reactants A and B in liquid or solution form and adding reactant B to reactant A using a cubic or incremental addition technique to control extent of reaction and thus crystallization kinetics, including supersaturation and nucleation, to produce crystals of drug substance which are generally larger, better quality and with few fines and narrow particle size distribution than normally obtainable employing prior art crystallization techniques. In addition, crystals of drug substance produced by the above process is also provided.
Owner:BRISTOL MYERS SQUIBB CO
Method and device for suppressing subsynchronous oscillation of double-fed wind power plant
ActiveCN108631331ASuppression of subsynchronous oscillationsSingle network parallel feeding arrangementsPower oscillations reduction/preventionVoltage amplitudeElectricity
The invention provides a method and a device for suppressing subsynchronous oscillation of a double-fed wind power plant. The method comprises the following steps of acquiring a voltage signal and a current signal of an output end of the double-fed wind power plant; analyzing the voltage signal and the current signal, determining voltage amplitude, current amplitude and a subsynchronous oscillation frequency of the subsynchronous oscillation of the double-fed wind power plant; determining parameters of a damping controller according to the voltage amplitude, the current amplitude and the subsynchronous oscillation frequency of the subsynchronous oscillation and a damping controller parameter table, wherein the damping controller parameter table is a pre-established table for a corresponding relation between the oscillation frequency and the damping controller parameters; and connecting the damping controller with the determined control parameters to a reactive control link of a wind turbine generator of the double-fed wind power plant in series in order to suppress the subsynchronous oscillation of the double-fed wind power plant. According to the method and the device, the subsynchronous oscillation of the double-fed wind power plant is suppressed based on the parameter self-adjustable series type additional damping controller, and the subsynchronous oscillation of the wind power plant can be simply and quickly suppressed, so that a system can run stably.
Owner:NORTH CHINA ELECTRICAL POWER RES INST +3
System and method for testing wind farm power control strategy
ActiveCN103605360AIncrease the probability of successful commissioningReduce hidden dangersElectric testing/monitoringFault toleranceClosed loop testing
The invention provides a system and method for testing a wind farm power control strategy. A wind farm power control strategy making module of the system comprises a network data receiving / transmitting module, a data analyzing module, a data-caching module, a data fault tolerance module, an active / reactive control module and a real-time data interaction module, wherein the network data receiving / transmitting module, the data analyzing module, the data-caching module, the data fault tolerance module, the active / reactive control module and the real-time data interaction module are connected in sequence. The output end of the data fault tolerance module is connected with the input end of the real-time data interaction module. Information interface is conducted between the wind farm power control strategy making module and a wind farm grid analog simulation module or an actual grid interface module through the network data receiving / transmitting module. According to the system and method for testing the wind farm power control strategy, wind farm operation information is received in real time, set power values of wind farm units and reactive-load compensation devices are sent to the corresponding wind turbine generator units and the corresponding reactive-load compensation devices in a wind farm at regular intervals according to the different power control strategies, finally a closed loop for testing the control performance of a wind farm active / reactive control system is formed, and the success rate of on-site putting into operation is improved.
Owner:STATE GRID CORP OF CHINA +2
Fast reactor having reactivity control reflector
InactiveUS20090190710A1Increase productivityImprove reliabilityNuclear energy generationFast fission reactorsNuclear engineeringFast-neutron reactor
A fast reactor having a reactivity control reflector has a reactor vessel in which a coolant is accommodated, a reactor core which is installed in the reactor vessel and dipped with the coolant, and a reflector installed outside of the reactor core so as to be movable in a vertical direction for controlling the reactivity of the reactor core. The reflector of the fast reactor has a lower neutron reflecting portion having a neutron reflection capability higher than that of the coolant and an upper cavity portion located above the neutron reflecting portion and having a neutron reflection capability lower than that of the coolant. The cavity portion is composed of a plurality of cylindrical hermetically-sealed vessels.
Owner:KK TOSHIBA
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