48 results about "Error band" patented technology

A mass spectrometer is disclosed wherein the experimentally determined mass to charge ratios of ions are reported together with an error band for each mass to charge ratio determination. The error band may, for example, reflect a 95% probability or confidence that the real, true, actual or accepted mass to charge ratio of the ion lies within the error band. By accurately determining the error band the possible candidate ions in a database can be accurately restricted whilst also guarding against over restriction.

The invention provides a wind power probability forecasting method based on numerical weather forecasting ensemble forecasting results. Numerical weather forecasting serves as the foundation, basic input data are provided for short-period wind power forecasting through a numerical weather forecasting ensemble forecasting technology, and a short-period forecasting model is established for each ensemble member to obtain a plurality of groups of forecasting results. For the obtained plurality of groups of forecasting results, and different characteristic forecast errors are classified through an ensemble forecasting configuration characteristic classification method and a forecasting power level classification method to obtain future forecast error bands under certain confidence level. According to the wind power probability forecasting method, under the same confidence level, the error band section is narrower, and for power grids containing large-scale wind power integration, under the condition of the same safety margin, the power grid operation cost can be effectively reduced, and the power grid operation economical property can be improved.

A method for controlling an electrical converter comprises the acts of determining an error value based on a difference between an estimated output value and a reference output value, the estimated output value being based on measurements in the electrical converter; comparing the error value with an error band and in the case of the error value exceeds the error band, controlling the electrical converter by switching to a different control scheme. The converter is controlled with the modified pre-calculated switching by determining a pre-calculated switching sequence for the converter based on an actual state of the electrical converter, the switching sequence comprising a sequence of switching transitions of the converter; modifying the pre-calculated switching sequence by modifying transition times of switching transitions of the pre-calculated switching sequence, such that the error value is minimized; and applying at least a part of the modified switching sequence to the electrical converter.

The invention discloses a surface shape detection device and a surface shape detection method that a phase bending surface shape detection method and a laser interference surface shape detection method are combined; the surface shape detection device comprises an imaging unit, a light path adjusting unit, a reference mirror group, a laser interference illumination unit and a phase bending projection unit; the phase bending projection unit and the reference mirror group have the conjugation relationship; and the light of a pattern projected by the phase bending projection unit reaches a surfaceto be detected after passing through the reference mirror group. According to the surface shape detection device and the surface shape detection method provided by the invention, while the detectionprecision of the laser interference detection method is kept, the dynamic range is enlarged; the error band coverage is wide; detection from a low-frequency surface shape to medium-high frequency error can be carried out; full-aperture detection can be rapidly completed without scanning; an extra complex posture calibration process is not required in the system; and posture adjustment of the detection system can be completed based on laser spot alignment of a laser interference light path itself.

The invention discloses a rotary hot spare dispatching method in the construction of an intelligent power grid on the basis of a relevance vector machine. The invention relates to the rotary hot spare dispatching method in the construction process of the intelligent power grid on the basis of the relevance vector machine and aims to solve the problem that a rotary hot spare is difficult to set for a new energy resource power system to stabilize the power fluctuation of a wind power connected grid, wherein the new energy resources comprise scale wind power and the like. An initialization setting result is transferred into a wind power relevance vector machine forecasting system; a wind power station wind-power acquisition module acquires a measurement value of a wind power of a wind power station in real time and transfers data into the wind power relevance vector machine forecasting system after carrying out data preprocessing; the wind power relevance vector machine forecasting system receives the data and carries out forecasting on the wind power at the moment in the future so as to obtain a forecasting result, i.e. an error band of the wind power value at the moment in the future and the wind power; and the obtained forecasting value and error band are sent into a dispatching controller, wherein the forecasting value is a power generation plan of the wind power station in the future and the power range represented by the error band is rotary hot spare distributed to the wind power station. The rotary hot spare dispatching method is used in the construction of the intelligent power grid.

The invention relates to a method for estimating wind speed fluctuation uncertainty based on an effective turbulence intensity instantaneous model, and solves the problems that error bands in the same width are given in an area with low wind speed and an area with high wind speed and an overlarge prediction error exists, does not accord with actual conditions and is not favorable for making a reasonable scheduling plane for a power grid in a method for estimating the uncertainty of wind speed fluctuation based on the current theoretical model. Instantaneous standard deviation of turbulence residual difference is obtained through a Mallat wavelet decomposition and reconstruction algorithm, and the uncertainty of the wind speed fluctuation is estimated by fitting through the effective turbulence intensity instantaneous model according to average wind speed. The method is used for predicting the power of a wind power plant, so that the reasonable scheduling plant is made for the power grid, spinning reserve is determined, and the operation of the power grid is safely and economically guaranteed.

The invention relates to a novel track planning method of an intelligent concrete distribution robot. The track planning method is suitable for autonomous pouring control of the concrete distribution robot and avoids complex inverse kinematics interpolation calculation. The invention belongs to the field of intelligent manufacturing. A universal track planning framework is designed, the universal track planning framework comprises a rapid movement process of the distribution robot from an initial state to a path starting point and from a path end point to the initial state, and a continuous concrete pouring process of the distribution robot from a pouring path starting point to a pouring path end point. In the rapid movement process, a simple interior point method is adopted to carry out inverse solution optimization with time optimization as a target, and a cubic polynomial is adopted to fit a track; in the continuous concrete pouring process, a path needing to be poured at the tail end of the distribution robot forms an error band with a certain area, region division is conducted on the formed path error band through a Q learning algorithm, an award value is given to the divided region according to a pouring target and constraint, Q value training is conducted on a given grid, and finally, an action sequence of all joints of the robot is formed, robot actions are directly obtained, and a complex track planning process based on kinematics inverse solution optimization is avoided.

The invention discloses a synergic control method for power allocation of an electric vehicle composite power supply. The synergic control method comprises the steps of acquiring a DC bus voltage in real time; making a synergic control strategy according to the DC bus voltage acquired in real time and a DC bus reference voltage, and calculating to obtain a reference current of a hysteresis currentcontroller; acquiring a filtering inductance current in a bidirectional boost-buck converter, generating a switch control signal according to the acquired filtering inductor current and the referencecurrent; and generating a pulse signal to control on/off of a first control switch and a second control switch according to the switch control signal so as to achieve synergic control for power allocation of the composite power supply. With a given error band, the filtering inductor current i<L> is controlled to follow the reference current I<r>, a supercapacitor is controlled to charge and discharge, the output DC bus voltage v<0> is maintained constant, the reference current I<r) of a filtering inductor is obtained according to the synergic control strategy, the DC bus voltage v<0> is optimized, the dynamic response of the supercapacitor is improved, and the optimal power balance is maintained between a storage battery and the supercapacitor.

The invention discloses a servo system non-switching attraction repetitive control method adopting equivalent disturbance compensation. According to the method, a given module generates periodical reference signals, a periodical feedback link is created, equivalent disturbance compensation is introduced into a non-switching attraction law, and an observer is utilized to estimate equivalent disturbance; an ideal error dynamic state is established based on the non-switching attraction law, a controller is designed according to the ideal error dynamic state, and a signal obtained through calculation is used as control input of a servo system; and specific controller parameter setting can be performed according to system convergence performance representing indexes, and calculation formulas ofa monotone decreasing region, an absolute attraction layer, a steady-state error zone boundary and the maximum number of steps of a tracking error entering a steady-state error zone for the first time, all of which represent a tracking error convergence process, are given. According to the non-switching attraction repetitive controller with the equivalent disturbance compensation function, through estimation of equivalent disturbance, system tracking precision can be improved, and periodical disturbance can be completely suppressed.

A servo system quick attraction repetitive control method adopting equivalent disturbance compensation is characterized in that a continuous time quick attraction law is given, a quick attraction lawconvergence time is calculated, the quick attraction law is discretized, generation of periodic reference signals by a module is given, a periodic feedback element is constructed, the equivalent disturbance compensation is introduced into the quick attraction law, and equivalent disturbance is estimated through an observer; ideal error dynamics are constructed based on the quick attraction law, acontroller is designed according to the ideal error dynamics, and signals obtained through calculation are used as control inputs of a servo system; and controller parameter setting is carried out according to indicators representing the system convergence performance, and calculation formulas for a monotonic decreasing region, an absolute attraction layer, a steady-state error band boundary and the maximum number of steps for the initial entry of tracking errors into a steady-state error band, which represent a tracking error convergence process, are given. The quick attraction repetitive controller with the equivalent disturbance compensation provided by the invention has the advantages that through equivalent disturbance estimation, the system tracking precision can be improved, and periodic disturbances can be completely inhibited.

A finite value power attraction repetitive controller design method comprises the steps that a given module generates periodic reference signals, and a periodic feedback link is constructed; equivalent disturbance compensation is introduced into a finite value power attraction law, and equivalent disturbance is estimated through a disturbance observer; an ideal error dynamic state (an attraction law with an interference suppression effect) is constructed, a controller is designed according to the ideal error dynamic state, and a signal obtained by current calculation is served as input of a servo system; and specific controller parameter setting is carried out according to indexes representing system convergence performance, and a computational formula representing an attraction domain boundary, a monotone decreasing area, an absolute attraction layer, a steady-state error band and the maximum convergence step number in a tracking error convergence process is given. The finite value power attraction repetitive controller provided by the invention can completely inhibit periodic components of an interference signal and inhibit the influence of aperiodic components.

The invention discloses a quick turning method for photoelectric equipment by combining bang-bang control and overshoot-free predictive control. According to the method, the advantage that bang-bang control is high in large-range turning speed is combined, and no-overshoot prediction control is used in the turning process, so that the turning time of the system is shortened, and the target capturing state and the tracking state can be stably switched. The system receives a guide signal and controls a driving motor to turn with the maximum driving force through bang-bang, and when approaching the target, the system is switched to non-overshoot prediction control to quickly approach the target and meet a target capture condition. According to the method, the system is optimized from the minimum time control problem; the advantage that the bang-bang control is high in turning speed in a large range is brought into full play; the characteristics that the system can quickly enter a steady state within limited time without overshoot prediction control energy are utilized, so that oscillation is not generated when the position of the system enters an error band; the advantages of the twocontrol methods are complementary; and the whole-process turning speed and stability of the photoelectric equipment are improved under the condition that the cost is not increased.

The invention relates to a design method of a digital repetitive controller for attraction of a servo motor at a specified time. The design method comprises the following steps that: a given module generates a periodic reference signal and constructs a periodic feedback link; equivalent disturbance compensation is introduced into a specified time attraction law, and equivalent disturbance is estimated by using a disturbance observer; an ideal error dynamic state (an attraction law with an interference suppression effect) is constructed, a controller is designed according to the ideal error dynamic state, and a signal obtained by current calculation is taken as the input of a servo system; specific controller parameter setting is carried out according to indexes representing system convergence performance, and a computational formula representing an attraction domain, a monotone decreasing area, an absolute attraction layer, a steady-state error band and the maximum convergence step number in the tracking error convergence process is given. The specified time attraction repetitive controller provided by the invention can completely inhibit periodic components of interference signals and inhibit the influence of aperiodic components of the interference signals.

The invention discloses a design method of a Buck type converter digital controller adopting interference filtering compensation. An interference compensator based on a moving average filtering technology is adopted and is embedded into a constraint variable speed attraction law, and an ideal error dynamic state with interference suppression capability is constructed; and dynamically designing a digital controller according to the ideal error, and taking a control signal obtained by calculation as a control input signal of the Buck-type converter. Specific controller parameter setting work can be carried out according to indexes of a system attraction process, and expressions representing an absolute attraction layer and a steady-state error band boundary of the system attraction process are given. According to the digital controller design method provided by the invention, various interference signals such as system flutter and nonlinearity can be effectively suppressed, output voltage ripples can be effectively reduced, and inductive current constraint hardware protection is realized.

The invention discloses a voltage tracking control method for a DC buck converter, and the method comprises the steps: constructing a discrete variable-speed attraction law, and estimating the interference of a system through an interference compensator based on a moving average filtering technology; and constructing an ideal error dynamic state based on a discrete variable-speed attraction law and an interference compensator, designing a discrete controller according to the ideal error dynamic state, and taking a signal obtained by calculation as control input of the direct-current buck converter. Specific controller parameter setting work can be carried out according to indexes of convergence performance and steady-state performance of the system, and specific expressions of absolute attraction layers and steady-state error band boundaries representing the convergence performance and the steady-state performance of the system are given. The discrete voltage tracking control method provided by the invention has the advantages of fast convergence, effective suppression of various interferences such as system buffeting, noise and nonlinearity, and effective reduction of output voltage ripples.