1202 results about "Equivalent model" patented technology

A system and a method are provided for performing an integrated uncertainty analysis on a system having interacting modules. The interaction of the modules includes data transfer between the modules with the output of one module being indicative of the input of another module. An uncertainty analysis is performed on each module based on given probability density functions of each input to the module. The uncertainty analysis may include developing a deterministically equivalent model for one or more modules. Data may be provided from one module to another in a uniform format. Thus, two or more modules may be integrated with uncertainties in the inputs of one module being effectively propagated to the inputs of another module. A plurality of modules may thus be modeled as a single integrated system. The integrated system may be replaced with a deterministically equivalent model, preferably of a further reduced order. In this manner, key uncertainties in particular inputs may be isolated. Once these inputs are identified, resources may be effectively allocated to minimize the impact of those inputs on the variability of the results.

A battery management system that estimates an internal impedance of a battery, a method of driving the same, a device that estimates an internal impedance of a battery, and a method of estimating the internal impedance of a battery. A method of driving a battery management system that estimates the internal impedance of a battery including a plurality of cells includes generating a battery equivalent model of the battery, receiving a terminal voltage signal and a charge and discharge current signal of the battery, and generating a first discrete signal corresponding to the terminal voltage signal of the battery and a second discrete signal corresponding to the charge and discharge current signal of the battery, and filtering the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model so as to estimate the internal impedance of the battery. The device that estimates an internal impedance of a battery filters the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model so as to estimate the internal impedance of the battery.

The simulation consists of a front-end simulation and a back-end simulation. The front-end simulation can use an equivalent model at different abstraction level, or a simulation model for the back-end simulation. The back-end simulation uses the simulation result of front-end simulation so that it can run one or more simulation runs sequentially or in parallel. Alternatively, models at lower level of abstraction are simulated together with a model at higher level of abstraction in parallel using two or more simulators.

The accuracy of neural response recordings in neural stimulators, e.g., cochlear implants, is often degraded by a recording artifact. An idealized electrical-equivalent model of a neural stimulator is created to study, measure and compensate for artifact evoked compound action potential (eCAP). Using this model, the artifact is shown to occur even when the electrical components that make-up the neural stimulator are ideal. The model contains parasitic capacitances between the electrode wires. The model demonstrates that these small parasitic capacitances provide a current path during stimulation which can deposit charge on the electrode-tissue interfaces of the recording electrodes. The dissipation of this residual charge and the charge stored across the stimulating electrode is seen as the recording artifact. The proposed solution for eliminating the artifact problem is realized by utilizing a capacitive electrode material, e.g., TiO2, Ta2O5, or other dielectric coatings or films, instead of Faradaic electrode material, e.g., Platinum (Pt), Pt—Ir alloy or similar alloys, on the neural stimulator electrode lead.

The invention discloses an SOC (Stress Optical Coefficient) estimation method for power batteries based on a RC (Remote Control) equivalent model, which comprises the following steps: determining an estimation equation based on the RC equivalent model and expanding an estimation method of a Kalman filter. The SOC estimation method has the beneficial effects that the charge states of the power batteries can be accurately estimated, and as SOC values directly reflect the states of the batteries, the maximum discharge current of each battery can be limited, the driving mileage of an electric vehicle can be forecasted; and the performance difference among all the batteries in a battery pack can be identified according to the SOC values of the batteries, and equalizing charging is performed to keep the uniformity of battery performance and finally achieve the purpose of prolonging the service lives of the batteries.

The invention provides a simulation modeling method for equivalent simulation of a doubly-fed wind-power generator set. A frequency converter of the doubly-fed wind-power generator set is simulated by controlled source. The simulation modeling method includes the following steps of (1), building a model of a circuit of the doubly-fed wind-power generator set; (2) building an equivalent model of the doubly-fed wind-power generator set; (3) building a grid-integration testing system of the doubly-fed wind-power generator set; and (4) setting up a testing system for multiple wind-power generator sets, wherein in the step (2), the equivalent model of the doubly-fed wind-power generator set is built on the basis of characteristics of a controlled voltage source of an alternating-current side and a controlled current source of a direct-current side of the frequency converter of the doubly-fed wind-power generator set. By the aid of the simulation modeling method, transient-state characteristics of the doubly-fed wind-power generator set can be simulated accurately, and different characteristics and mutual affection among multiple wind-power generator sets can be computed. High-frequency on and off of fully-controlled devices cannot be taken into consideration, and simulation efficiency is improved greatly. The more the wind-power generator sets are simulated, the more evidently the efficiency is improved, simulation step-length can be increased on the premise of guaranteeing accuracy, and simulation efficiency is improved greatly.

A parameter estimation device using a filter has a preprocessing computing means 6, a state estimating means 7 and a state-of-charge estimating means 9. A low-pass filter 61 of the preprocessing computing means 6 transfers voltage preprocessing value Vp and current preprocessing value Ip from inputted discharge-and-charge current value I and terminal voltage value V, respectively. The state estimating means 7 estimates parameters of a state equation of a battery equivalent model 7A based on the battery equivalent model 7A containing a resistance and a capacitor from the voltage preprocessing value and the current preprocessing value inputted from the means 6. The state-of-charge estimating means 9 estimates the state of charge from state quantity obtained by the means 7. The time constant varies in such a way that the higher the temperature and the state of charge SoC becomes the smaller the time constant becomes.

The invention relates to a method for testing the electricity of an ultrahigh-voltage transmission line based on electric field measurement, which comprises the following steps: 1, establishing a measurement point; 2, measuring an electric field; 3, establishing a transmission line power frequency inverse problem equivalent model; and 4, computing the voltage of the transmission line according to the electric field at the measurement point to obtain the actual voltage of each phase of transmission line, if the voltage of the transmission line is below 30 V, determining the transmission line is electrically neutral, otherwise, determining the transmission line is electrified. The invention also relates to a system for implementing the method for testing the electricity of the ultrahigh-voltage transmission line based on the electric field measurement, which consists of an electricity testing terminal and a data processing centre. The method and the system realize the non-contact electricity testing of the ultrahigh-voltage transmission line and ensure the safety of workers. Because the voltage level of the ultrahigh-voltage transmission line is high and a safe distance is long, the safe, effective and new method for testing the electricity of the ultrahigh-voltage transmission line is provided.

In a robot apparatus having a base unit, a wheel unit of an opposed-two-wheel type mounted on the base unit and having driving wheels drivable so as to face each other, and an upper-body unit provided on an upper portion of the base unit and configured by concatenating one or more joints; a robot apparatus includes an opposed-two-wheel equivalent model, a robot-state observing unit, a control unit performing a control arithmetic operation for the opposed-two-wheel equivalent model, a transforming unit transforming a part of control target values calculated by the control unit to a control target value for the wheel unit, and a joint control unit controlling a joint-driving actuator of the wheel unit and also controlling a joint-driving actuator other than the joint-driving actuator.

The invention discloses a lithium battery SOC online estimation method comprising the following steps that 1) the open-circuit voltage of a battery is measured, and the state-of-charge initial value of the battery is obtained according to an OCV-SOC curve; 2) the second-order RC equivalent model of the battery is established and the parameter initial value of the battery equivalent model is estimated; 3) the estimation program is started, and the matching coefficient initial value of a state equation is set according to the battery state-of-charge initial value and the parameter initial value of the battery equivalent model; 4) the current battery state-of-charge value is obtained by using an adaptive unscented Kalman filtering algorithm, and the current open-circuit voltage is obtained according to the OCV-SOC curve; 5) the least square method with the forgetting factor is started to identify the parameters of the current battery equivalent model, the matching coefficient of the state equation is updated by the identified parameters and the battery state-of-charge value of the next moment is solved; and 6) the steps 4) and 5) are repeated so that the battery state-of-charge value of each moment is obtained. Compared with the conventional unscented Kalman filtering algorithm, the method has higher accuracy and higher error convergence.

A method for uncertainty estimation for nonlinear inverse problems includes obtaining an inverse model of spatial distribution of a physical property of subsurface formations. A set of possible models of spatial distribution is obtained based on the measurements. A set of model parameters is obtained. The number of model parameters is reduced by covariance free compression transform. Upper and lower limits of a value of the physical property are mapped to orthogonalspace. A model polytope including a geometric region of feasible models is defined. At least one of random and geometric sampling of the model polytope is performed in a reduced-dimensional space to generate an equi-feasible ensemble of models. The reduced-dimensional space includes an approximated hypercube. Probable model samples are evaluated based on data misfits from among an equi-feasible model ensemble determined by forward numerical simulation. Final uncertainties are determined from the equivalent model ensemble and the final uncertainties are displayed in at least one map.

The invention discloses a SOC-SOH joint on-line real-time estimation and on-line modification method, the method comprises an SOC hardware pre-estimation module and a lithium battery equivalent-circuit parameter correction module, wherein the SOC hardware pre-estimation module utilizes a Hall current sensor to convert a heavy current signal into a low voltage signal, noise filtering is performed on the signal through a band-pass filter, the filtered signal is transmitted to an RC integrator to indirectly realize the integral for the current signal, and an integral signal acquired by an ADC is transmitted to an MCU chip to correct; the lithium battery equivalent-circuit parameter correction module comprises a square-wave pulse switch current source and a controllable electronic load, the square-wave pulse switch current source or the controllable electronic load is utilized to perform charge or discharge test on the lithium battery, the ADC is utilized to acquire terminal voltage of a battery pack, and according to the input response of charge or discharge curve, parameters of a battery equivalent model in a charge-discharge process are corrected. According to the invention, the method overcomes a circuit model parameter correction problem and realizes SOC-SOH real-time accurate on-line joint estimation.

The invention relates to a method for controlling an index time-varying slide mode of flexible spacecraft characteristic shaft attitude maneuver, and belongs to the technical field of spacecraft control. The method comprises the steps that firstly, a system dynamically equivalent model, a dynamic model and a flexible vibration model are established under a spacecraft system, then, the vibration frequency and the damping ratio parameter of a closed loop system with the index time-varying slide mode control law are calculated, and a single-shaft multi-modality filtering input shaping device with a characteristic shaft as a rotary shaft is designed according to the designing method of the single-shaft input shaping device to restrain flexible vibration in three-shaft motion. Meanwhile, a state observer is designed to estimate flexible modal information in real time, and the method for controlling an output feedback index time-varying slide mode is formed. At last, saturability analysis is conducted on control torque so as to satisfy the physical saturation constraint of the control torque. By means of the method, the application range of existing input shaping is expanded, the input shaping technology is expanded from single-shaft maneuver to three-shaft maneuver, the self-robustness of filter input shaping is enhanced, and the purpose that the attitude maneuver path of the spacecraft is the shortest is achieved.

This invention relates to a method and processor (19) for power analysis in digital circuits. The method incorporates a main processor (19) and an associative memory mechanism (101a, 101b, 102, 104, 105, 106), the associative memory mechanism comprising a plurality of associative arrays (101a, 101b), an input value register (102), at least one result register (104) and a memory block area (29). A circuit design is transformed into a functionally equivalent model format suitable for processing in the associative array and thereafter input vectors are applied to the circuit and a record is kept of the inputs and or the outputs on each of the gates in the circuit over a specified time period. In this way, it is possible to calculate the leakage power dissipation as well as both the toggle dynamic power and the transition dynamic power.

The invention discloses a WARD equivalent expansion method based on sensibility in the electric power dispatching automation domain, which comprises the following steps: conveying real-time data from lower level electric network dispatching center to higher level electric network dispatching center; doing total network current calculation; calculating real-time external net equivalent model for each lower level electric network; sending the external net equivalent model to the lower level electric network dispatching center through remote data net; combining the received external net equivalent model of lower level electric network dispatching center self electric network with self interior electric network detail model; doing network analytic calculation of lower level electric network energy management system and artificial training system, wherein the system is periodic starting or automatic starting when the network structure changes. The invention adapts expansion WARD equivalent method of keeping buffer net, which is automatic formation through artificial assignment or sensitivity method.

The invention discloses an identification method of a second order resistance and capacitance (RC) equivalent model of a power lithium battery based on a second order RC model. The identification method of the second rate RC equivalent model of the power lithium battery includes the steps of confirmation of an identification equation of the second order RC equivalent model, acquisition of identification data, calculation of battery ohm internal resistance and identification of the least square method. By means of the identification of the second order RC equivalent model of the power lithium battery, the dynamic and static performances of the battery can be reflected well; on one hand, the RC equivalent model has more precise characterization electrical parameters, the dynamic behavior of charging and discharging of the battery can be simulated scientifically and precisely in consideration of temperature, current and internal resistance difference in the process of charging and discharging; on the other hand, the order of the model is two, no complicated mathematical calculation is needed, and thus a computer can process the model conveniently. Therefore, a mathematical model is established by using the second order RC equivalent model, the state of charge (SOC) of the battery can be evaluated scientifically and precisely, and the identification method of the second rate RC equivalent model of the power lithium battery can be widely used in the research and application of the power lithium battery.

The invention discloses a method for identifying an RC (resistor-capacitor) equivalent model of a power battery. The method comprises the following steps of: confirming an identification equation of the RC equivalent model, acquiring identification data, calculating an internal discharge resistance of the battery and identifying a least square method. According to the method, the dynamic and static features of the battery are reflected well; on one hand, the model has a relatively high precision characterization electric quantity parameter, and the charge and discharge behaviors of the battery can be simulated accurately under the condition that the temperature, the current and the internal resistance difference in the charge and discharge process are considered; and on the other hand, the model is relatively low in order, so that complex mathematic calculation is avoided, and the structure is relatively simple, thereby being conveniently processed in a computer. Therefore, the method for establishing a mathematic model by using the method for identifying the RC equivalent model of the power battery can be widely used in the research of the power battery, and particularly the research of a lithium ion battery.

The invention discloses an electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform. The electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform comprises a neutral grounding module, a 10 kV bus, a 10 kV pi-type equivalent model electric transmission line module and a single-phase ground fault module. The electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform can dynamically simulate a single-phase ground fault of an overhead line of different lengths and a cable line of a distribution network in a 1:1 voltage class. The electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform can simulate different neutral grounding modes, such as neutral ungrounding, neutral low-resistance grounding and neutral grounding through an arc suppression coil; transmission lines of different lengths and different types can be simulated, such as the overhead line or the cable line; single-phase ground faults of various types can be simulated, such as metallic grounding, arc light grounding, high resistance grounding and the like; meanwhile, the electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform is provided with a distribution network fault indicator, a line selection and fault positioning device and ports of a DTU / FTU and other distribution network automation terminals, and the requirements for scientific researches, product development, product testing and related personnel operating training in directions of the distribution network single-phase ground fault line selection, traveling wave distance measurement accurate positioning and the like are met.

The invention discloses an SOC estimation method based on a Kalman filtering method, and belongs to the field of power battery management. The method specifically comprises the steps that 1, a power battery model is built, and a precise lithium power battery model is built mainly by determining an equivalent circuit model and based on test data; 2, power battery SOC is estimated; 3, EKF algorithmis adopted to estimate an SOC result and conduct error analysis. The method provided by the invention analyzes the working principle of a lithium ionic battery and builds a power lithium ionic batterydivalent RC equivalent model, identifies the parameter models through laplace transformation and a large number of experiment data, and adopts a matlab platform to estimate the power lithium batterycharge state. The emulation result shows that the model has the good adaptability to the complex working conditions of electric automobiles, not only can the precision of SOC estimation be improved, but also the computing quantity is small, and SOC estimation is easy to achieve.

The invention belongs to the technical field of lithium battery health management, and particularly relates to a combined simulating evaluation method of the state of health and the state of charge ofa lithium battery. A lithium battery equivalent circuit is utilized to describe battery characteristics, and a describing means is provided for a hysteretic phenomenon existing in the relation of open circuit voltage and the state of charge; internal resistance of the battery is introduced to serve as a state variable, the state variable is correlated with the state of health of the battery defined from the aspect of the capacity and the internal resistance of the battery, and thus the current capacity of the battery is updated in real time by updating the internal resistance. In this way, ageing of the battery can be self-adapted, and the high describing precision is maintained all the time. Compared with an existing method, the combined simulating evaluation method can achieve real-timeonline capacity estimation which is difficult to implement by a traditional method, the real-time accuracy degree of the circuit equivalent model is guaranteed, and references are provided for the state of health and the state of charge of the battery.

The invention discloses a dynamic equivalence modeling method for a double-fed set wind power station based on the action condition of an pitch angle, relating to the technical field of wind power generation and solving the problem of low accuracy and difficult realization of the existing equivalence modeling method. The method comprises the following steps: firstly, acquiring the active power, generator terminal voltage and wind speed of the double-fed set before the fault of a model to be modeled in the wind power station; according to the parameter, extracting the characteristic vector reflecting the action of the pitch angle, inputting into a support vector machine classifier, and dividing the vector into three cluster; and finally equaling the three clusters into three equivalent double-fed wind power sets respectively and calculating the parameters and the equivalent cable parameter of each set, thereby obtaining a wind power station equivalent model. The modeling method has less number of the equivalent wind power sets, is convenient to use, can more accurately reflect the sychronization point dynamic characteristics of the wind power station, is applied to the dynamic equivalence modeling of the high-capacity wind power station and the impact analysis of the high-capacity wind power station to a power system, and has the important project application value.

The invention discloses a method for estimating lithium battery SOC based on self-adaptability fuzzy Kalman filter. For different lithium batteries, after Kalman filter discrete state model is determined, the SOC is estimated by the utilization of the method of self-adaptability fuzzy Kalman filter, wherein the residual variance matching degree and residual error mean of terminal voltage in a lithium battery equivalent model serve as input of a fuzzy control system, so that adjustment factors of a system noise variance and a measurement noise variance are obtained, and then the two variances are adjusted; the adjusted system noise variance and measurement noise variance are substituted into a Kalman filter algorithm to estimate SOC values at all moments. With the method, the power lithium battery SOC can be accurately estimated, the problems that according to an existing estimation method, the requirement for on-line estimation can not be satisfied, has large accumulated errors, diverges and is prone to being affected by noise can be solved, and the estimation accuracy is high.

The invention discloses a power battery charge state estimation method and system. The method comprises the steps: building equivalent models for all kinds of power batteries based on laboratory environments and a standard battery second-order model, and fitting battery parameters; building a state-space equation of a battery output-input linear system according to the equivalent models; setting the initial SOC estimated value when a practical power battery system is started, determining the corresponding battery parameters according to the types of batteries in the practical power battery system, and setting a noise weight function needed by running of an H(infinity) filtering algorithm; and starting the running of the power battery system after the parameters are set, in the running process, collecting values of voltage, current and temperature of each battery at each sampling moment in real time, substituting the collected values of voltage, current and temperature of each battery at each sampling moment into the state-space equation and the noise weight function, and calculating to obtain the SOC estimated value at each moment in real time by adopting the H(infinity) filtering algorithm. According to the method, any assumption on outside noise is not required, so that the estimated accuracy is obviously improved, and the antijamming capability is greatly improved.

A method for generating models for simulating the imaging performance of a plurality of exposure tools. The method includes the steps of: generating a calibrated model for a first exposure tool capable of estimating an image to be produced by the first exposure tool for a given photolithography process, where the calibrated model includes a first set of basis functions; generating a model of a second exposure tool capable of estimating an image to be produced by the second exposure tool for the photolithography process, where the model includes a second set of basis functions; and representing the second set of basis functions as a linear combination of the first set of basis functions so as to generate an equivalent model function corresponding to the second exposure tool, where the equivalent model function produces a simulated image corresponding to the image generated by the second exposure tool for the photolithography process.

The invention discloses a determination method for a partition D-STATCOM integrated optimization configuration scheme of a large-scale power grid. The method comprises the steps of first starting from a dynamic analysis method theory of a non-analytic complex power system, establishing a power system non-linear equivalent model, rapidly and accurately calculating system integration dynamic equivalence impedance and load static equivalence impedance of an a load node of a study area to obtain limit margin; enabling areas with total loads ranking at the top to be weak areas according to researched network load flow calculation analysis results, enabling dispatching partitions in the weak areas to be study objects, comparing voltage stability strength indexes of every partition to determine weak partitions so as to enable the weak partitions to serve as configuration study objects, utilizing the fact that an average value of substation impedance modulus margins of the partitions is a threshold value to determine reactive power compensation to-be-selected point sets, shrinking configuration point hunting zones, and comprehensively utilizing trace sensitivity index maximum points to determine configuration points; and finally utilizing an optimal model considering voltage dip risk cost to determine an optimal capacity.

The present invention provides, in at least one embodiment, a system and method for power control of lasers. The system includes a device's control signal fed into a laser. The laser can be a master oscillator power amplifier (MOPA) fiber laser. The device includes an equivalent model circuit representing at least one parameter of the laser, such as the gain fiber inversion in the power amplifier. The device measures the power at the equivalent model circuit. Then, the device uses its feedback signal to control and / or adjust the output power control signal fed into the laser based on the measured power. By controlling the power fed into the laser, the laser can be operated at much lower frequencies while keeping the laser power within acceptable limits.

The invention provides a biped robot walking plan and control method. The method comprises the steps of establishing an equivalent model of a robot; determining a phase change graph meeting the requirement of the equivalent model; determining a phase change graph of a single-step horizontal movement track according to a human gait walking formula, namely, calculating a relationship between the speed of a single step and the step length / period of the single step; calculating a foothold according to the horizontal movement track of the single step; and controllably converting the position of the calculated foothold into an angle required for finishing motion of each joint. According to the method, the human gait formula is associated with the relationship between the walking speed and the step length / period of the single step, so that the calculation of the step length / period of the single step can be simplified; the period of the single step serves as a trigger event of single-step starting and ending, so that the end speed of the single step can be well predicted and the real-time calculation and adjustment of the foothold can be facilitated; and based on the motion description of the phase change graph, the analysis of a motion law of the biped robot can be more visual.

The invention discloses a ship cabin indoor explosion structure damage evaluation method based on an equivalent scale model. The ship cabin indoor explosion structure damage evaluation method comprises the following steps: obtaining an impact wave pressure curve and a quasi-static pressure curve of explosion of equivalent filling in a scale cabin by adopting a pressure sensor; processing test data to obtain a pressure peak value and corresponding pressure impulse; determining a damage rule of the explosion in the equivalent cabin according to the positive pressure acting time of pressure born by the cabin wall and the natural vibration period of the cabin; dividing damage grades and determining a structure damage threshold value of the equivalent cabin; and evaluating damage effects of a ship cabin structure by taking the structure damage threshold value as the basis. The invention provides the ship cabin indoor explosion structure damage evaluation method based on the equivalent scale model by taking a ship cabin indoor explosion effect scale equivalent model as a test carrier, so that the testing cost can be reduced, the researching period is shortened, and the development and application of anti-ship weapons are effectively supported.