57 results about "Interaction factor" patented technology

The invention provides a method for determining commutation failure of a multi-infeed direct current power transmission system. The method is characterized by comprising the steps of calculating the extinction angle of an inverter station in the system in case of three-phase short-circuit grounding and single-phase short-circuit grounding of each node based on a nodal impedance matrix and by virtue of a node voltage interaction factor, and determining whether the direct current system fails in commutation with a critical extinction angle as the criterion. Besides, the calculation results of all the nodes are integrated, and a three-phase critical failure impedance boundary and a single-phase critical failure impedance boundary are delimited on a network topology, respectively. The minimum extinction angle is taken as the determination criterion of the method for the commutation failure, and an alternating current system area causing the commutation failure of the direct current system during a fault can be determined quickly and accurately through simple calculation by virtue of the critical failure impedance boundaries, and the accuracy of the determination method is improved while the determination process of the commutation failure is simplified. The influence, caused by a fault of an alternating current system, on the direct current system can be determined and analyzed clearly and visually.

The invention discloses a multi-feed-in interaction factor calculation method considering a direct-current control mode. The multi-feed-in interaction factor calculation method comprises the followingsteps: firstly defining a multi-feed-in interaction factor considering the direct-current control mode, deriving a correction coefficient of the multi-feed-in interaction factor by introducing the direct-current control mode in a traditional calculation formula of the multi-feed-in interaction influence factor without considering the direct-current system control mode, obtaining the correction coefficient by calculating the sensitivity of converter absorption reactive power to commutation bus voltage under different direct-current system control modes and obtaining a traditional multi-feed-ininteraction factor by calculating a system node impedance matrix. Therefore, the multi-feed-in interaction factor practical calculation method considering the direct-current control mode is finally given. By applying the method, factors affecting MIIF values can be conveniently subjected to quantitative analysis, and the defects that the conventional MIIF calculation method does not take the direct-current control mode into consideration, and the calculation and analysis efficiency is low are overcome.

Cell therapy comprises encapsulating a cell with an integrin or other cell interaction factor, for administration to a mammal. The cells may express a therapeutic transgene or the cells may be regenerative.

Techniques for modeling living biological systems include receiving constant values for multiple interaction factors wij. A set of initial state values is received for state variables that indicate relevant properties of a living biological system. Also received is a set of trial values for perturbation variables that indicate factors that might affect one or more of the relevant properties of the biological system. A temporal change in a value for a particular state variable is determined based on a non-linear transformation of a sum of the trial value for the perturbation that affects the particular state added to a sum of all non-zero values for a product of wij and a state variable over all state variables.In some embodiments, measurement-based values are received for a measurable subset of the state variables. Values for the constant interaction factors wij are determined based on the measurement-based values.

The invention discloses a station-configuration method for a dynamic reactive compensation apparatus capable of improving multi-feed direct current restoration capability, and belongs to the technical field of a power system and automation thereof. According to the method, the mutual influence between direct current systems is pre-determined through a multi-feed interaction factor index between the direct current systems; after faults are screened primarily, the direct current restoration is relatively low in speed, and tightly-linked direct current exists between the direct current systems; and the dynamic reactive optimal compensation location is determined by taking the reactive supporting capability of the dynamic reactive compensation apparatus into consideration. By adoption of the station-configuration method, the direct current restoration characteristic in the alternating current / direct current systems can be mastered in advance by an electric power system planning and operating staff so as to formulate an optimization station-configuration scheme for the dynamic reactive compensation apparatus, so that the safety, stability and the automatic level of the system are improved.

The invention provides a method for measuring a strength index of interaction between converter stations of a multi-feed direct current system. The method comprises the following steps that (1)a multi-feed alternating current and direct current power grid receiving end system is taken as a research focus, direct current converter stations to be researched are determined, and it is assumed that the number of the direct current converter stations to be researched is N, and the direct current converter stations to be researched have three phases of A, B and C; (2) electromechanical transient simulation calculation is conducted on the power grid with electromechanical transient simulation software, a single-phase grounded short circuit with certain resistance is arranged at the phase A at a converter bus i, i=1, 2, ...N, the change of the voltage of the phase A at the converter bus i is observed, the grounded resistance of the short circuit is adjusted constantly, the voltage of the phase A at the converter bus i drops by 1% after the short circuit, the variation delta UAj of the voltage of the phase A at the converter bus j is recorded, j=1, 2, ..., i-1, i+1, ...N, and the calculation of the phase B and the calculation of the phase C are identical with that of the phase A; (3) a single-phase multi-feed interaction factor SMIIFij between the converter station i and the converter station j is calculated. By means of the method, references are provided for evaluating the strength of the interaction between all converter stations in the multi-feed direct current system in asymmetrical faults.

The invention provides a ground heat exchanger used for a ground source heat pump air conditioning system. According to structural factors of pipes themselves and interaction factors between the pipes and geothermal resources and through structural improvement and optimization, the heat exchange performance of the ground heat exchanger is enhanced, and the heat exchange efficiency between water flows in the pipes of the ground heat exchanger and the geothermal resources is increased. The ground heat exchanger is used in the ground source heat pump air conditioning system, the service life of the ground heat exchanger can be prolonged, the energy efficiency of the ground source heat pump air conditioning system is increased, energy consumption and the fault rate of the system are lowered, and therefore the problem that an existing ground heat exchanger structure is prone to causing low heat exchange efficiency, high fault rate, low energy efficiency, non-obvious energy-saving benefits and the like of the ground source heat pump air conditioning system is solved.

The invention discloses an analysis method for multi-feed DC interaction factors based on reduced order Jacobian matrix, and the method comprises the steps as follows: simplifying and equivalently processing the DC- AC system to obtain the equivalent system; building the reduced order Jacobian matrix linearized model of the equivalent system; calculating multi-feed DC interaction factors through the related Jacobian matrix element. An analysis method for multi-feed DC interaction factors based on reduced order Jacobian matrix comprises the steps as follows: simplifying and equivalently processing the DC- AC system to obtain the equivalent system; building the reduced order Jacobian matrix linearized model of the equivalent system; calculating multi-feed DC interaction factors through the related Jacobian matrix element. MIIF can be calculated through Jacobian matrix related element, the existing running state of the system is not changed, the simulation experiment is avoided for calculating MIIF. The essence and impact factor for the MIIF are processed on theoretical derivation and analyzed, the former calculating method for MIIF is improved and the result is more reasonable and accurate.

The invention discloses a method for determining the risk degrees of mutual influence of multi-infeed alternating current-direct current system inversion stations. The method comprises the following steps that 1, a model corresponding to a multi-infeed alternating current-direct current system is established; 2, disturbance is exerted on a certain inversion station i in the model, so that the voltage Ui of a converter bus i of the inversion station i is reduced by 1%; 3, based on voltage variations delta Uj of other inversion stations j in the multi-infeed alternating current-direct current system, three-phase multi-infeed interaction factors MIIFij of the inversion station i and inversion stations j are calculated; 4, based on the scores of the three-phase multi-infeed interaction factors, the first risk degree Ra and / or the second risk degree Rb of a certain inversion station k are calculated; 5, the first risk degree Ra and / or the second risk degree Rb are compared with reference values (or standard values) so as to determine the risk degrees of one or more inversion stations in the multi-infeed alternating current-direct current system. The method has the guiding effect on finding of potential risks of direct-current station commutation failure and formulation of corresponding prevention measures and can also provide reference indexes for direct-current station address selection.

The invention discloses a method for calculating a critical multi-infeed interaction factor in consideration of direct current change. The method comprises the steps of determining a to-be-detected multi-infeed alternating current and direct current system and acquiring a multi-infeed alternating current and direct current system network, a network parameter, a component model and a model parameter to generate load flow calculation data; calculating the load flow calculation data by use of a load flow calculation method to obtain an operational parameter of the multi-infeed direct current system; and calculating the critical multi-infeed interaction factor in consideration of the direct current change among inverter stations.

The invention provides a multi-infeed direct-current auxiliary power / frequency combination controller coordination optimization control method, which comprises the following steps of: establishing a mathematical model of a multi-infeed direct-current power transmission system according to a connection relationship of the multi-infeed direct-current power transmission system; solving a multi-infeedinteraction factor, a multi-infeed effective short-circuit ratio and a multi-infeed power support factor of the multi-infeed direct-current power transmission system in a mode of applying small disturbance; determining the final DC power boosting amount of each loop; judging the tie line fault by measuring whether the power of the tie line is suddenly reduced to 0 or not; obtaining a multi-infeeddirect-current auxiliary power / frequency combined controller structure by adopting an active power large-mode controller and a bilateral frequency difference controller structure. The multi-infeed effective short-circuit ratio proportionality coefficient and the multi-infeed power support factor proportionality coefficient are adopted to perform emergency control on an internal fault of the alternating current system and a tie line fault disturbance form, so that coordination and optimization of emergency control of the multi-infeed direct current interconnected power system are realized, andthe transient stability of the system is improved.

The embodiment of the invention provides a video playing evaluation method and device. The method comprises the steps of obtaining a grade value of a definition grade factor of a played video and a numerical value of a target playing factor; Determining a target evaluation function corresponding to the obtained grade value from the corresponding relationship between each grade value and the evaluation function; And obtaining an evaluation result of the played video based on the target evaluation function and the numerical value of the target playing factor. According to the technical scheme, the definition grade factor is added in the evaluation process to serve as the non-service-quality feature, the service quality feature of the playing interaction factor and / or the playing experience factor is further included, and evaluation is more comprehensive compared with evaluation in the prior art based on the non-service-quality feature and the service quality feature. Wherein the definition level factor is related to the playing interaction factor and the playing experience factor, and the playing interaction factor is not related to the playing experience factor, so that the increasing number of the cross features is controlled, and the increasing degree of the evaluation complexity is further controlled.

A method to quantify and correct for drug-drug interaction, physiologic change, diet, weight, genetic data and compliance on Warfarin dosing. The International Normalized Ratio (INR), a lab value used to follow Warfarin use, will fluctuate in an unpredictable manner due to factors other than the current Warfarin dose. The method mathematically describes these changes and eventually adjusts for these interacting factors through the use of logistic regression (LR) or multiple linear regression analysis. By anticipating changes in INR, Warfarin dosing can be adjusted resulting in patients having their INR be therapeutic range. The technique can be used in any field that requires a specific measured quantity, with variables that change and the need to correct for changes with a mathematical model.

The present invention provides individual solutions to workplace fatigue and stress by determining the specific support needed for each individual. Specifically, the present invention defines and utilizes an ergonomic interaction factor to enable selection of a proper fitting shoe. Such selection occurs in one embodiment by dividing a person's weight by the contact area of the bottom of their feet.

A method for determining a unit action coefficient based on subsynchronous oscillation analysis is used for a multi-direct-current sending end system, and comprises the steps that the conversion current bus voltage of the direct current K corresponding to the maximum value in action coefficients of all direct currents on an ith generating set is reduced by 1%; the change rates of the voltages of other direct current conversion current buses are obtained, and multi-direct-current interaction factors are determined according to the change rates; the equivalent capacity for the multiple direct currents to be equivalent to one direct current K is determined according to the direct current interaction factors; the comprehensive action coefficient of all the direct currents on the ith generating set is worked out through the obtained equivalent capacity. The interaction factors of the multiple direct currents are used for enabling the multiple direct currents to be equivalent to be one direct current, then the comprehensive action coefficient of the multiple direct currents on the generating set is obtained with the single-loop direct current unit action coefficient method, the reliability is high, and the level of analyzing subsynchronous oscillation risks of the multi-direct-current system is increased.

The invention relates to an online identification method for node voltage interaction factors based on electric power system voltage noise-like signals, and belongs to the field of stability analysis and assessment of electric power systems. The method includes the steps: firstly, making application conditions and applicable objects of the voltage interaction factors clear; linearly simplifying systems and building a multi-send direct-current system node voltage sensitivity identification model; acquiring node voltage signals in the electric power systems, and performing filtering, amplitude limiting, detrending and the like for the signals to obtain node voltage noise-like signals; performing identification by the aid of a multiple linear gradual regression method to obtain interaction factors between direct-current circuit conversion bus voltages. The voltage interaction factors are mainly used for measuring interaction between direct-current systems among multiple direct-current systems based on a steady state process or a temporary steady state process. The method can be used for monitoring the interaction strength between the systems, a criterion is provided for local stability of the systems, the stable risk prediction efficiency of the electric power systems is effectively improved, and spot testing cost is reduced.

The invention provides a judgment method and device for simultaneous commutation failure of high and low end current converters. Firstly the interacting factor of the low end current converter for thehigh end current converter and the interacting factor of the high end current converter for the low end current converter are calculated, then the critical interacting factor of the low end current converter for the high end current converter and the critical interacting factor of the high end current converter for the low end current converter are calculated, and finally the situation of simultaneous commutation failure of the high and low end current converters is judged so that judgment of the situation of simultaneous commutation failure of the high and low end current converters can be realized. According to the technical scheme, the interaction effect of the high end current converter and the low end current converter in the DC power transmission system is considered so that misjudgment of the situation of simultaneous commutation failure of the high end current converter and the low end current converter can be avoided and the judgment result is relatively accurate.

The invention provides a design method of a power battery system with a heat insulation device based on a brittleness theory of a complex system. The method comprises the following steps of (1) building an analysis model of a complex battery management system according to framework characteristics of the battery management system; (2) building the analysis model of a brittleness system of the complex battery management system according to the interaction relationship among various sub-units of the battery management system; (3) analyzing an entropy change rule and the brittleness stability of the built complex brittle battery management system; and (4) rebuilding interaction factors among the sub-units according to entropy change rule and brittleness collapse influence factors of the obtained complex brittle battery management system, reducing the collapse probability of the power battery system and automatically restoring the power battery system into a stable state when the brittleness influence factors are generated. The brittleness theory of the complex system is introduced into the design of the power battery system, so that the influence of sub-unit collapse on the overall power battery system is controlled to the minimum degree.

The embodiment of the invention discloses an application interaction interface generation method and device, equipment and a memory medium. The method comprises the steps of displaying interaction interface template options in a preset interface of an application, and selecting an interaction interface template according to input of a user; displaying a corresponding interaction factor and a parameter input interface of the interaction factor according to the selected interaction interface template, and receiving a control parameter of the interaction factor input by the user; and generating an interaction interface according to the selected interaction interface template and the control parameter of the interaction factor in the interface. According to the technical scheme provided by theembodiment of the invention, the interaction interface template options and the parameter input interfaces of the interaction factors are provided for the user to select and input according to a demand, the individualized design of the interaction interface is realized, the generation technical difficulty of the interaction interface is reduced, and the convenience for classroom interaction in ateaching scene is provided.

An insertable shoe insole or shoe integrally formed therewith having electrostatic protection and a method of categorizing and selecting same which provides individual solutions to workplace fatigue and stress by determining the specific support needed for each individual. Specifically, the present invention defines and utilizes an ergonomic interaction factor to enable selection of a proper fitting shoe. Such selection occurs in one embodiment by dividing a person's weight by the contact area of the bottom of their feet. The insole includes an electrically conductive material for the purpose of eliminating the buildup of static charge by conducting static charges from the user's feet to conductive shoes which then transfer the charge to the floor.

The invention discloses an evaluation method of a multi-infeed direct current power system. The method comprises the steps of: obtaining fault types of a multi-infeed direct current power system and occurrence probability of each fault type; aiming at each fault type, determining the voltage drop amplitude of the ith inverter station when the ith inverter station generates the fault type; applyingreactive power impacts with different sizes to the ith inverter station to fit K voltage drop amplitude-reactive power impact value curves; and multiplying the occurrence probability of each fault type by the corresponding action parameter, performing summing, and taking the result after summing as MIIF (Multi-infeed Interaction Factor) j, i of the ith inverter station to the jth inverter stationso as to perform multi-infeed direct current power system evaluation based on the MIIFj, i. By applying the scheme of the invention, the calculated MIIFj, i can better reflect the voltage drop causedby the fault in the practical application, thereby facilitating evaluation of the multi-infeed direct current power system more accurately. The invention further provides an evaluation system and device of a multi-infeed direct current power system, and a storage medium which have the corresponding effects.

The present invention provides individual solutions to workplace fatigue and stress by determining the specific support needed for each individual. Specifically, the present invention defines and utilizes an ergonomic interaction factor to enable selection of a proper fitting shoe. Such selection occurs in one embodiment by dividing a person's weight by the contact area of the bottom of their feet.

The invention discloses a service recommendation method and system based on social network analysis. The method includes the steps that according to the historical communication records of a first user, communication traffic information of each communication mode used when the first user interacts with at least another user is obtained; according to the communication traffic information, the interaction factor between the first user and another user is calculated; according to the historical service information of the first user, the use information of each service applied by the first user is determined and subjected to ex-right processing; according to the interaction factor between the first user and another user and the use information, subjected to ex-right processing, of each service applied by the first user, the recommended priority of each service applied by the first user is determined, and the services with the highest current priority are recommended to the first user. The service recommendation method and system based on the social network overcome the defect that a traditional method can only carry out analysis for a single service, a single client and a single communication mode, and can recommend the most needed service for the user.

A MIIF analysis method unde constant DC power and constant voltage control is compose of obtaining equivalent admittance corresponding to each converter station accord to operation state of each converter station under constant DC power and constant voltage control mode, and obtaining equivalent admittance corresponding to each converter station according to said equivalent admittance. And then obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; Wherein n is the number of AC nodes of the power grid system; acquiring an original AC node admittance matrix of the power grid system; Modifying the original AC node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix; a multi-feed DC interaction factor is calculated according to the node impedance matrix. When the equivalent admittance corresponding to each converter station is obtained according to the operation state of each converter station in the DC constant power and constant voltage control mode, the dynamic response characteristics of the DC transmission system can be considered, and the voltage interaction degree between the DC converter stations can be accurately calculated and evaluated.

The invention discloses a method for determining the risk degree of influence on inversion stations of alternating-current junction stations. The method comprises the following steps that 1, a model of a multi-infeed alternating current-direct current system is established, including n inversion stations and m alternating-current junction stations; 2, disturbance is exerted on one of the inversion stations i, so that the voltage Ui of a converter bus i of the inversion station i is reduced by 1%; 3, based on voltage variations delta Uj of the inversion stations j in the multi-infeed alternating current-direct current system, three-phase multi-infeed interaction factors MIIFij are calculated; 4, based on the scores of the three-phase multi-infeed interaction factors, the risk degree R of a certain inversion station k is calculated; 5, the risk degree R is compared with a reference value (or a standard value) Rstandard, and when the R is greater than or equal to the reference value Rstandard, it is determined that the risk degree of the inversion station is higher than those of common inversion stations. The method has the guiding effect on finding of potential risks of direct-current station commutation failure and formulation of corresponding prevention measures and can also provide reference indexes for direct-current station address selection.

The invention discloses an analysis method of MIIF under constant power constant arc extinguishing angle control, which comprises the following steps: firstly, obtaining equivalent admittance corresponding to each converter station according to the operation state of each converter station of the power grid system under the constant power constant arc extinguishing angle control mode of DC; And then obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; Wherein n is the number of AC nodes of the power grid system; Acquiring an originalAC node admittance matrix of the power grid system; Modifying the original AC node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix; A multi-feed DC interaction factor is calculated according to the node impedance matrix. When the equivalent admittance corresponding to each converter station is obtained according to the operation state of each converter station of the grid system under the DC constant power constant arc extinguishing angle control mode, the dynamic response characteristics of the DC transmission system can be considered, and the voltage interaction degree between the DC converter stations can be accurately calculated and evaluated.

The invention provides a reactive power compensation configuration optimization method for a power system, and belongs to the field of reactive power compensation configuration of the power system. The method comprises the following steps: firstly, establishing an electromechanical transient simulation model of a to-be-optimized power system, and acquiring power flow data and short-circuit currentof each node in the to-be-optimized power system; after the nodes are classified, with consideration of a node load rate, obtaining an initial alternative node configured with reactive compensation,and with consideration of the effect of a reactive voltage source and a multi-infeed interaction factor, performing aggregation to finally obtain a reactive compensation alternative node of the to-be-optimized power system; and optimizing the reactive power capacity required to be configured for each reactive power compensation alternative node by adopting a genetic algorithm to obtain a reactivepower capacity optimization compensation result of each reactive power compensation alternative node. The method is easy to implement and high in accuracy, and is a practical reactive compensation configuration optimization method for the power system.