331 results about "Power injection" patented technology

A contrast media injection system includes detects the absolute position of the syringe ram using a non-contact sensor. A series of magnets and Hall-Effect sensors may be used or an opto-reflective system. Illuminated knobs that are connected to the drive mechanism for the syringe ram rotate with the drive and provide visual feedback on operation through the illumination. Analog Hall-Effect sensors are used to determine the presence or absence of magnets that identify the type of faceplate being used. The faceplates include control electronics, connected to the powerhead through connectors, which may be interchangeably used by the two faceplates. The faceplate electronics include detectors for automatically detecting the capacity of pre-filled syringes. Additional features include using historical data to provide optimum pressure limit values during an injection protocol, a removable memory device for storing and transferring information such as injection protocols and injector statistics, and password protection of such protocols.

An area electric power system includes a number of direct current power sources, and a number of inverters operatively associated with the number of direct current power sources. Each of the number of inverters is structured to provide real power and controlled reactive power injection to detect islanding. An output is powered by the number of inverters. A number of electrical switching apparatus are structured to electrically connect the number of inverters to and electrically disconnect the number of inverters from a utility grid. A number of devices are structured to detect islanding with respect to the utility grid responsive to a number of changes of alternating current frequency or voltage of the output.

A wireless access point system provides a wireless access zone as part of a home communication network. A power injector is provided proximate a router / switch for a home communication network to inject power into a cable run extending from the router / switch to a remote location for the wireless access zone. A wireless access point assembly is mounted in a ceiling or wall to provide the wireless access zone. The wireless access point assembly includes an active access point and a power extractor connectable to the cable run to separately provide power and a communication link from the cable run to the active access point.

A valve assembly for a catheter comprising a housing having a lumen extending therethrough a first port opening to a proximal end of the lumen via a first port passage and a valve disposed in the first port passage, the valve being biased toward a closed configuration to prevent fluid flow therethrough when the first port passage is not in use in combination with a second port opening of the housing in fluid connection with a proximal end of the lumen via a second port passage.

A power injection catheter for high flow rate delivery of fluids. The power injection catheter may include a pressure relief mechanism for preventing overpressurizing within the lumen of the catheter. The pressure relief mechanism may be configured to prevent sudden pressure build-up inside the catheter lumen by absorbing, buffering or releasing pressure inside the lumen during pressure spikes. The power injection catheter may also take the form of a multi-lumen catheter capable of simultaneous infusions of a single fluid through two or more of the lumens in the catheter.

A wireless power transfer system including a driver coil array, a hexagonally-packed transmitter mat, a receiver coil, and a load coil for powering a medical implant. The magnetically coupled resonance between two isolated parts is established by an array of primary coils and a single small secondary coil to create a transcutaneous power link for implanted devices as moving targets. The primary isolated part includes a driver coil array magnetically coupled to a mat of hexagonally packed primary coils. Power is injected by the driver coils into the transmitter coils in the transmitter mat to maintain resonance in the presence of losses and power drawn by the receiver coil from the magnetic field. The implanted secondary isolated part includes a receiver coil magnetically coupled to a load coil. A rectification / filter system is connected to the load coil supplying DC power to the electronic circuits of the implant.

A power injection catheter for high flow rate delivery of fluids. The power injection catheter may include a pressure relief mechanism for preventing overpressurizing within the lumen of the catheter. The pressure relief mechanism may be configured to prevent sudden pressure build-up inside the catheter lumen by absorbing, buffering or releasing pressure inside the lumen during pressure spikes. The power injection catheter may also take the form of a multi-lumen catheter capable of simultaneous infusions of a single fluid through two or more of the lumens in the catheter.

The invention relates to the technical field of operation and control of an electric power system and discloses a method for detecting and identifying dynamic bad data of the electric power system. The method comprises the steps of A, reading a current network parameter and a network topology of the electric power system and forming a node admittance matrix and a branch circuit-node incidence matrix; B, establishing an equivalent circuit according to the network topology of the electric power system and configuring measurement functions and a power management unit (PMU) of the electric power system, wherein system measurement includes node voltage amplitude measurement, node current amplitude measurement, node power injection measurement and node trend measurement; C, detecting and identifying the dynamic bad data of the electric power system; D, judging the convergence condition. By means of the method, accidentally arisen bad data from a supervisory control and data acquisition (SCADA) system and in the PMU measurement can be found and eliminated, and accordingly an accurate operation state, voltage amplitude and phase angles of nodes of a power grid are obtained.

Power injection catheters for high flow rate delivery of fluids are disclosed. In one embodiment, a catheter may include a body defining one lumen and a plurality of extension tubes each comprising a lumen in fluid communication with the one lumen of the catheter body. Further, an extension tube may be configured for performing power injection and an extension tube may include a proximal valve. In another embodiment, a catheter may comprise a plurality of lumens and extension tubes, each of the extension tubes comprising a lumen in fluid communication with one lumen of the catheter body, respectively. At least one extension tube may be configured for performing power injection and at least one extension tube may include a proximal valve. Such catheters may include a pressure relief mechanism for preventing overpressurizing of the catheter. A method of injecting a fluid into a patient's body is disclosed.

A contrast media injection system includes detects the absolute position of the syringe ram using a non-contact sensor. A series of magnets and Hall-Effect sensors may be used or an opto-reflective system. Illuminated knobs that are connected to the drive mechanism for the syringe ram rotate with the drive and provide visual feedback on operation through the illumination. Analog Hall-Effect sensors are used to determine the presence or absence of magnets that identify the type of faceplate being used. The faceplates include control electronics, connected to the powerhead through connectors, which may be interchangeably used by the two faceplates. The faceplate electronics include detectors for automatically detecting the capacity of pre-filled syringes. Additional features include using historical data to provide optimum pressure limit values during an injection protocol, a removable memory device for storing and transferring information such as injection protocols and injector statistics, and password protection of such protocols.

A multi-lumen catheter comprising a longitudinally extending elongated body portion, with at least two septa extending longitudinally therethrough the entire body portion, defining a central lumen and two side lumens. The central lumen is of oblong shape in cross section, and is positioned between the side lumens. The septa that form the central lumen are configured to be capable of flexing outwards when the central lumen is under pressure, such as when used in procedures that require power injection, whereby a cross sectional area of the central lumen resultantly increases to increase flow capacity through the central lumen. In some embodiments, the central lumen has a defining inner surface such that a radius of curvature of the central lumen inner surface is, in all locations, equal to or greater than a radius of curvature of an outer surface of a guide wire used for insertion of the multi-lumen catheter. The septa are each configured to fail under pressure before failure of the outer wall.

The invention relates to the technical field of electric power system operation and control and discloses an electric power system dynamic state estimation method based on a synchronous phase-angle measuring device. According to the technical scheme, the method comprises the steps of A, reading current network parameters of an electric power system and a network topological structure of the electric power system, and therefore forming a node admittance matrix and a branch-node incidence matrix; B, establishing an equivalent circuit according to the network topological structure of the electric power system, and configuring a measurement function of the electric power system and a PMU of the electric power system, wherein the measurement of the system comprises node voltage amplitude measurement, node current amplitude measurement, node power injection measurement and node load flow measurement; C, conducting dynamic state estimation on the system on the basis of extended Kalman filtering; D, judging conditions of convergence. According to the electric power system dynamic state estimation method based on the synchronous phase-angle measuring device, due to the introduction of the PMU, real-time and accurate measurement information such as the voltage and the phase angel can be supplied to the system, the higher measurement redundancy rate of the system is obtained, and therefore the precision of the state estimation is improved. The electric power system dynamic state estimation method based on the synchronous phase-angle measuring device has the advantages of being good in robustness, high in state estimation precision and good in convergence performance.

A contrast media injection system includes detects the absolute position of the syringe ram using a non-contact sensor. A series of magnets and Hall-Effect sensors may be used or an opto-reflective system. Illuminated knobs that are connected to the drive mechanism for the syringe ram rotate with the drive and provide visual feedback on operation through the illumination. Analog Hall-Effect sensors are used to determine the presence or absence of magnets that identify the type of faceplate being used. The faceplates include control electronics, connected to the powerhead through connectors, which may be interchangeably used by the two faceplates. The faceplate electronics include detectors for automatically detecting the capacity of pre-filled syringes. Additional features include using historical data to provide optimum pressure limit values during an injection protocol, a removable memory device for storing and transferring information such as injection protocols and injector statistics, and password protection of such protocols.

The invention discloses an aid decision making method for out-of-limit of a static security analysis device, which is characterized by comprising the following steps: carrying out tidal current calculation on a given base data section of a power grid, calculating the sensitivity of branch active power on node active power injection, and calculating cut-off distribution factors of branches quicklyin accordance with the sensitivity information; using contingency screening and rapid analysis of local factorization to calculate a security state of the power grid running under an expected accident and determining an out-of-limit device and tidal current out-of-limit quantity in each cut-off mode; calculating cut-off sensitivity of node injection power on the branch power under the expected accident; calculating the output adjusted quantity of a generator for eliminating the out-of-limit of the branch; and ordering in accordance with the sensitivity and the maximum release quantity respectively so as to form an aid decision making table for out-of-limit of a static security analysis device. The aid decision making method can be used to provide an aid decision making method on the static security analysis quickly.

A system for detecting islanding of a microgrid includes a number of power sources to output real power and controlled reactive power injection; a number of controllers each controlling one of the number of power sources; and an output from the microgrid powered by the number of power sources. A number of electrical switching apparatus electrically connect the output from the microgrid to a grid and electrically disconnect the output from the microgrid from the grid. A microgrid controller detects islanding of the microgrid with respect to the grid, and sends a number of commands to a number of the number of controllers in order to control reactive power injection by a number of the number of power sources. A communication channel is between the microgrid controller and the number of controllers. A number of microgrid loads are powered by the output from the microgrid.

The invention discloses a power system optimization tide and a realtime pricing method based on the hyperplane form security domain boundary, using the quiescent voltage security domain in the cutset power space and the utility dynamic security domain in the injection power space to respectively show the quiescent voltage stabilization restriction and the transient stabilization restriction, further defining the complex security constraint set including the static state security constraint, the static state voltage security constraint and the transient security constraint. All the variables in the objective function and the constraint expression are the schedulable values injected into the power system of the power space before the accident, different expected accidents in the expected accident set are reflected in the coefficient change of the restriction expression. In the solving method, a processing method performing the decoupling optimization-iteration to the wattful and the wattless production cost is adopted, to obtain the wattful electricity price and the wattless electricity price and the component electricity price related to the different constraint, wherein the obtained component electricity price reflects that the power injection at different nodes corresponds to the effect of the restriction, thereby using the realtime electricity price to inspirit the market participants to actively maintain the system safety.

The invention discloses a loss prediction method for a large-scale wind power-accessed power grid and belongs to the technical field of control and prediction of grid-connected power generation of a wind farm. The method comprises the following steps: determining an output probability distribution curve of the wind farm, as well as an output probability distribution curve and a load probability distribution curve of a generator according to the system data and wind farm data; calculating the expectation value of power injection of each node, as well as semi invariant of each order of wind farm injection power, generator injection power and the load power of each node; counting out a coefficient matrix according to the injection power expectation value of each node; counting out the semi invariant of each order of injection power of each node according to the obtained semi invariant; counting out loss power of each node according to the coefficient matrix and the semi invariant of each order of injection power of each node, so as to obtain a probability density function and a cumulative distribution function of the loss; and calculating out the loss electricity quantity in set time section according to the cumulative distribution function. Due to the adoption of the method, the loss of the large-scale wind power-accessed power grid can be accurately and quickly predicted.

Disclosed are methods for forming a shallow junction with a variable concentration profile gradation of dopants. The process of the present invention includes first providing and masking a surface on an in-process integrated circuit wafer on which the shallow junction is to be formed. Next, a low ion velocity and low energy ion bombardment plasma doping or PLAD operation is conducted to provide a highly doped inner portion of a shallow junction. In a further step, a higher ion velocity and energy conventional ion bombardment implantation doping operation is conducted using a medium power implanter to extend the shallow junction boundaries with a lightly doped outer portion. In various embodiments, the doping steps can be performed in reverse order. In addition, an anneal step can be performed after any doping operation.

The invention relates to a converter steelmaking method through power injection dephosphorization by adopting a supersonic speed oxygen lance and a supersonic speed oxygen lance, which can be used for solving the problems that slagging is slow in the steelmaking process and the dephosphorization rate is low caused by low stirring intensity in a dephosphorization period. A slagging material used for dephosphorization is transmitted through a supersonic speed oxygen lance and is sprayed into a molten pool in a supersonic speed power gas jet flow state and is fully contacted, so that rapid slagging is realized in the steelmaking process; thermodynamic and dynamic conditions of dephosphorization reaction are improved; and the steelmaking dephosphorization rate is improved; a power feeding pipe of the supersonic speed oxygen lance is connected with a oxygen blowing central pipe; the outlet of a power supply pipe is positioned between the upper part of the oxygen lance and the outlet of a sprayer; the inner diameter is 10-150mm; the power injection flow is 30-500kg / min; the carrier gas flow is 50-3000Nm3 / h and the pressure is 0.4-1.4MPa; a wear-resistant material is adopted at the damage part of a lance sprayer; and the mach number is 1.5-2.1. The converter steelmaking method is suitable for30-350 tons of a converter steelmaking dephosphorization process; compared with the traditional steelmaking process, the dephosphorization rate using the method can be improved by over 5%; the consumption amount of the slagging material is lowered by over 10%; and the metal yield is improved by over 0.5%.

A method and test setup for reducing the RF power requirement in active load pull uses impedance tuners between the output of the test transistor and the active RF power injection network. The active network uses either a closed loop (active load) configuration or an open loop network employing split or synchronized signal sources. The impedance tuners are wideband (fundamental) tuners, harmonic rejection tuners or multi-harmonic tuners. A 7:1 transforming ratio of the tuners represents the best compromise between power matching and tuner loss, yielding a reduction of 11dB in power requirements from the active load or the synchronized source(s); if only the fundamental signal is injected at the output of the DUT, a multi-harmonic tuner or a harmonic rejection tuner is used for independent harmonic tuning; if multiple harmonic signals are injected, a multi-harmonic tuner is used and creates passive harmonic loads while reducing at the same time the power requirements from the harmonic injection sources.

The invention discloses a multi-antenna relay transmission method of decomposing zero-forcing beam-forming based on singular value, which is characterized in that the relay station only makes use of the channel state information from the relay station to the user, and selects the transmission user congregation according to the semi-orthogonal user selection algorithm; the base station and the relay station jointly design the linear pre-processing matrix according to the singular value decomposition of the channel matrix from the base station to the relay station and the zero-forcing beam-forming matrix from the relay station to the user channel matrix; the base station allocates the power by using the power injection algorithm according to the channel state information from the base station to the relay station, and the relay station splits the power in accordance with the sub-flow number of the allocated power from the base station, so as to determine signals for the base station to send and signals for the relay station to transmit; and the transmission method system has advantages of small feedback amount, low complexity, effective control of noise amplification from the relay station, representing asymptotic optimal functions under the conditions that the power of the relay station is very large and that the number of system users are very large, and being suitable to be used in actual systems.

The invention provides a simple and convenient feasible improved power flow feasible solution recovering method, relating to the on-line safe monitoring of an electric system. The simple and convenient feasible improved power flow feasible solution recovering method comprises the following two substeps of: controlling quantity calculation and result checking which are iteratively carried out in the recovering process: the controlling quantity calculation step comprises the following procedures of: firstly solving a feasible region boundary point of a power injection space by dint of an optimal multiplier power flow, introducing a recovering parameter lambda, and calculating the sensitivity of the lambda on various control measures, and then estimating the adjusting quantity of various control measures on the basis of a sensitivity calculation result through mixed integer linear programming; and the result checking step comprises the following procedures of: verifying control effect through the optimal multiplier power flow, and returning to the controlling quantity calculation step to repeat the step till power flow calculation is convergent when the control measures can not ensure the power flow to be convergent because control strategies formed on the basis of the sensitivity which is the linear approximation of nonlinear relationship often have certain errors. The invention is mainly used for the electric system.

The invention belongs to the technical field of unified power quality conditioner voltage dip compensation control, and discloses a voltage dip compensation method of unified power quality conditioner with zero input active power. Zero input active power injection voltage dip (swell) compensation is achieved through the method of coordinately controlling output voltage of a cascade current converter of the unified power quality conditioner and output current of a multiple current converter. The compensation control method is simple and feasible, voltage dip (swell) persistent and continuous compensation of a device is achieved, and reliability of device compensation is improved. The problem that the direct voltage is in an undervoltage state or in an overvoltage state brought by active power injection in a compensation process is avoided, a resume or restart process of a compensation rear device is not needed, and stability of the device is improved.

The invention discloses a two-stage optimal power flow calculation method for a power supply containing a unified power flow controller. A UPFC (unified power flow controller) model is deduced based on a power injection method; a two-stage scheduling model is proposed; optimal power flow calculation models containing the UPFC are established separately; the volatility of intermittent energy is corrected through regulating the control parameters of the UPFC, and the coordinative cooperation between the wind power and the UPFC is realized. The two-stage optimal power flow calculation method has the beneficial effects that (1) the model initially formulates a unit output plane in an intraday rolling scheduling stage to optimize the running cost; then a control policy table of the unified power flow controller is obtained in a real-time scheduling stage according to wind power output predication error, the running plan is modified in real time and a scheduling evidence is provided for the running scheduling staff; and (2) the volatility and the uncertainty of the wind power output can be coordinated by the rapid regulation of the control parameters of the unified power flow controller based on the flexible control capability of the unified power flow controller, and the economical performance and the safety of the system are improved.

The invention provides a method for inhibiting the line power oscillation of an interconnected electric power system via an energy storing device. The method adopts the power of the line connected with a bus where the energy storing device is as an input signal, obtains an equivalent conductivity through a measurement amplifying link, a stopping link and a phase shifting link, and then obtains an active power instruction value needing to be output by the energy storing device by multiplying the equivalent conductivity by the square of a terminal voltage. A transducer of the energy storing device generates an appointed active power to the power grid through a given power value so as to inhibit the power oscillation of the line. The invention does not depend on a remote communication; the controller has simple and reliable structure and easily adjusted parameters; and a 300MW energy storing device can inhibit a power oscillation with amplitude about 1400MW.

The invention discloses an online transient safety stabilization evaluation method based on automatic expected fault set filtering and belongs to the electric power system safety stabilization analysis technology field. According to the method, a participation factor of a node active power for transient power angle stabilization is calculated based on a transient power angle stabilization participation factor of a generator and mutual impedance between a node and a generator inner node, weak node voltage sensitivity of a node reactive power for transient voltage safety stabilization is taken as a participation factor for transient voltage safety stabilization, a participation factor of the node active power for transient frequency safety is calculated based on mutual impedance between the node and a transient frequency safety weak node, a transient safety stabilization quantification evaluation result is estimated based on a previous transient safety stabilization quantification evaluation result and present node power injection change, an estimation parameter is corrected through a posteriori correction method according to the transient safety stabilization quantification evaluation result based on time domain simulation and difference of estimated values. The method is advantaged in that automatic expected fault set filtering of online transient safety stabilization evaluation can be realized.

The invention discloses a fast search method of a static voltage stability region (SVSR) boundary of an electric system. The method comprises the steps of determining a universal mathematical model of the SVSR boundary, determining an initial SVSR boundary point, initializing the universal mathematical model of the SVSR boundary, predicting an adjacent SVSR boundary point with a symbol as shown in the specification, correcting the predicted point with the symbol as shown in the specification to obtain a SVSR boundary corrected point with a symbol as shown in the specification adjacent to the initial SVSR boundary point z0, performing initial value cycling on the corrected point with the symbol as shown in the specification, searching a next adjacent SVSR boundary point by adopting the process, substituting s in a simultaneous gradient matrix and an additional equation to a symbol as shown in the specification in a cycling process until a power increase direction angle beta is less than 0 and greater than 90 degrees. The SVSR boundary constructed by the method has higher precision; and fast search of the SVSR boundary of the electric system in two-dimensional and high-dimensional active power injection spaces can be realized.