133results about How to "Suitable for practical engineering applications" patented technology

The invention provides a service life evaluation method for bus electrolytic capacitors of a motor driver. The method comprises the steps: testing the core temperature of each bus electrolytic capacitor of a driver and the working environment temperature by means of a temperature-sensitive technology, selecting the highest core temperature rise [Delta]T among the electrolytic capacitors, and calculating the core temperature T2 of the electrolytic capacitors when the driver is running in a condition with the upper limit environment temperature. The service life of the bus electrolytic capacitors is calculated according to the difference between the highest allowed core temperature and the T2 as well as correction coefficients of bus voltages, so the service life of the driver can be evaluated. According to the method, the influence brought by the difference between an actual temperature upper limit for a driver and a test environment temperature, the influence of bus voltage when the driver is in use and the influence of uneven temperature rises among bus electrolytic capacitors are all taken into consideration. Aspects are comprehensively considered by the method, and an evaluation result is reliable.

The invention proposes a high-speed target Doppler velocity measurement method based on the least square method, and the main idea of the method is that the method comprises the steps: determining a radar, supposing that there is a high-speed target in a radar detection range, and calculating the fuzziness of the high-speed target in the radar detection range and the blind speed of the high-speedtarget in the radar detection range; calculating a rough measurement value of the radial speed of the high-speed target in the radar detection range according to the fuzziness of the high-speed targetin the radar detection range and the blind speed of the high-speed target in the radar detection range; calculating a blind speed matrix of the high-speed target in the radar detection range according to the rough measurement value of the radial speed of the high-speed target in the radar detection range, and calculating the Doppler fuzziness root number vector of the high-speed target in the radar detection range based on the least square method; and calculating the real radial speed of the high-speed target in the radar detection range based on the Doppler fuzziness root number vector of the high-speed target in the radar detection range and the blind speed matrix of the high-speed target in the radar detection range.

The invention discloses an AC-DC system containing VSC-HVDC total transfer capability calculation method, and belongs to the field of electric power system dispatching automation, and the method comprises an AC-DC system containing VSC-HVDC total transfer capability calculation model based on multimode optimal power flow; an AC-DC system containing VSC-HVDC N-1 method is provided; N-1 fault screening is performed, and a COUENNE nonlinear mixed integer optimized model solver is used to solve the total transfer capability calculation model. According to the invention, VSC-HVDC control constraint after N-1 security constraint and fault is fully considered, problems of AC-DC system containing VSC-HVDC total transfer capability calculation and VSC-HVDC optimal parameter setting can be effectively solved, and the method has a good engineering application prospect.

The invention belongs to the field of dispatching automation of electric power systems, and particularly relates to a continuous power flow based maximum transmission capacity calculation method for a system containing a power source converter (VSC). The continuous power flow based maximum transmission capacity calculation method comprises the following steps: firstly establishing a multi-target maximum transmission capacity calculation model of an AC/DC system containing power source converter based high voltage direct current (VSC-HVDC); entering a predication link to solve a prediction equation based on the calculation model, then entering a correction link to solve a modified equation, entering a direction correction and parameter optimization link, and finally entering a safety verification ink to carry out static safety analysis so as to check voltage level and line heat stability; and simultaneously checking whether to reach a voltage collapse point. The static voltage stability, the static safety and the influence of system economy on transmission capacity can be taken into account comprehensively, so that the maximum transmission capacity calculation problem of the AC/DC system containing VSC-HVDC can be effectively solved, the electric generator economy output and VSC optimal control parameters are given out while the maximum transmission capacity is calculated, and the method has extremely good engineering application prospect.

The invention provides a circle detection method which comprises the following steps that: an edge map of an input image is obtained; a PHT method is used to detect a circle on the edge map; whether the peak in a parameter space obtained by the PHT is within a suspicious area is judged; if the peak is not within the suspicious area and is higher than the upper limit of the area, back to 'circle exists'; if the peak is lower than the lower limit of the suspicious area, back to 'circle does not exist'; if the peak is within the suspicious area, a small area image in which a suspicious circle corresponding to the current peak is in is copied from the original image; in the small area image in which the suspicious circle is located, the CHT method is used to detect the circle; and whether the circle exists if judged according to the detection results. The circle detection method has well guaranteed speed and precision, and is applicable to actual projects.

The invention relates to a multi-objective Pareto optimal control method of an inverter based on an immune algorithm, and the waveform quality of output current of the inverter and the multi-objective optimal control sequence of switching losses can be solved by adopting the immune algorithm. A waveform quality objective of output current is portrayed by output waveform quality evaluation function of the inverter, a switching losses objective is portrayed by SwitchingLosses evaluation function and gives Pareto optimal solution set in the form of the Pareto frontier, and designers can select out the most satisfactory solution of an optimal design from the Pareto optimal solution set according to wills and the degree of emphasis of each goal. According to the multi-objective Pareto optimal control method of the inverter based on the immune algorithm, losses of the inverter can be real-timely calculated due to the fact that characteristics and parameters of a device, load current, a switch gate pole drive signal and direct current bus voltage are provided by a calculation data sheet. Therefore, the multi-objective Pareto optimal control method of the inverter based on the immune algorithm has the advantages of having operability. Moreover, compared with the modeling approach of a physical model and a functional model, the multi-objective Pareto optimal control method of the inverter based on the immune algorithm is more suitable for actual engineering applications and has a potential for online monitoring.

The invention provides a method for evaluating the investment effect of a power distribution network based on a fuzzy interval hierarchy analysis method. The method comprises the steps of A, establishing a power distribution network investment effect evaluation index system; B, subjecting indexes to dimensionless treatment by adopting the concept of a membership function in fuzzy mathematics, andestablishing an index grading standard; C, calculating the weight of each level of indexes by adopting a fuzzy interval algorithm; D, calculating the comprehensive score of the power grid by means ofa multiplying operator. According to the invention, the calculation result shows that the method can scientifically and comprehensively evaluate the investment effect of the construction project of the power distribution network. The method is good in engineering application prospect.

The invention discloses a city streetcar, BRT and conventional bus transit network traffic allocation method and transfer junction determining method. The city streetcar, BRT and conventional bus transit network traffic allocation method and transfer junction determining method is characterized in that on the basis of fixed public transportation passenger flow OD and a known city streetcar, BRT and conventional bus transit network, the traffic among all traffic zones are allocated one by one according to the bidirectional traffic magnitude, from large to small, of the traffic zones, the traffic is allocated to the bus transit network with a shortest route algorithm, the transfer amount of each node is calculated, and transfer junction positions and levels are determined according to the transfer amount. The city streetcar, BRT and conventional bus transit network traffic allocation method and transfer junction determining method is mainly used for macroscopic public transportation transfer junction arrangement, the requirement that most travelers travel according to the shortest routes is satisfied, the attraction of large-capacity public transportation manners to the travelers is increased, and public transportation travelling efficiency is increased.

The invention provides a grid-connected micro-grid coordination control system, comprising: a grid coordination controller; In the microgrid, each energy storage unit and each renewable power supply are connected to the microgrid bus through a power supply switch, and each branch of the microgrid bus is provided with a branch outlet circuit breaker. A load switch is connected in series with each load in the microgrid; The micro-grid bus is also connected to the system grid through the grid-connected switch. Each power supply switch, each load switch, each branch outlet circuit breaker and grid-connected switch are respectively provided with a remote terminal device; The grid coordination controller is respectively connected with each energy storage unit, each renewable power source and each remote terminal equipment. The invention is suitable for grid-connected micro-grid, can maintain the stability in the process of unplanned and off-grid handover, and is suitable for practical engineering application.

The invention discloses a parameter estimation method for an artificial circuit fault component based on Hilbert-Huang transforming (HHT). The premise of the parameter estimation method for the artificial circuit fault component based on HHT is that a single fault component is already located, a sinusoidal excitation signal is applied on a circuit to be detected, and the output end of the circuit is used as a test point. First of all the relation of the parameters of the component and the Hilbert marginal spectrum total energy of a corresponding output signal is acquired through computer simulation, a relation curve equation is fitted, and the parameter estimation equation of the fault component of an actual circuit can be acquired after errors are compensated. The test point signals acquired by actual measurement are analyzed and calculated through the HHT to acquire the corresponding total Hilbert marginal spectrum energy, and the total Hilbert marginal spectrum energy is substituted into the parameter estimation equation to solve to gain the parameter values. The parameter estimation method for an artificial circuit fault component based on HHT is simple and effective, and is suitable for linear artificial circuits and non-linear artificial circuits, the estimated accuracy of the parameters is up to 95%, and only one accessible test node is needed, and therefore the parameter estimation method for an artificial circuit fault component based on HHT is suitable for practical engineering application.

The invention discloses a preparation method for a carboxymethyl chitosan gel ball, and belongs to the technical field of preparation technologies for the carboxymethyl chitosan gel ball. The preparation method comprises the steps that a certain carboxymethyl chitosan solution is dropped into a certain acetic acid solution to form a ball, intensifying is carried out in the acetic acid solution for a certain time, and the transparent ball is changed into a white solid ball; the intensified ball is put into a glutaraldehyde solution with a certain concentration, crosslinking is conducted at a certain temperature for some hours, then the ball is soaked into a sodium hydroxide solution with a certain concentration, parts which are not crosslinked are eliminated, finally pure water is used for washing the ball until the ball is neutral, and preparation is completed. The prepared carboxymethyl chitosan gel ball can swelled by absorbing water, and the size after the water is absorbed is times and even tens of times as big as the original size. Meanwhile, the removing efficiency of the gel ball for heavy metal contaminants can be strengthened by using the method.

The invention discloses a parameter optimization method for a communication integration signal of an asymmetric triangular frequency modulation radar. The shape of a frequency curve of the integration signal is an asymmetric triangle, and the integration signal consists of two LFM (linear frequency modulation) signals with opposite frequency modulation ratio symbols. The first signal is an LFM signal with the frequency modulation ratio k1, has no modulated communication information and is used for the synchronization or capturing of a communication signal, and the second signal is an LFM signal with the frequency modulation ratio k2, wherein k1*k2 is less than zero. Communication code element information is modulated on the second signal in a mode (-1, 1). The method is based on a parameterized model of the communication integration signal of the asymmetric triangular frequency modulation radar, and employs a fuzzy function for representing radar detection performances and a target function for representing communication performances to optimize and design the parameters of the integration signal. The method guarantees the probability of successful capturing of communication through employing a shortest synchronization signal, and guarantees an information transmission rate at a certain signal to noise ratio under the condition of guaranteeing the radar detection performances.

The invention discloses a state evaluation method for an urban underground comprehensive pipe gallery. The state evaluation method comprises the following steps of analyzing a possibility factor of danger occurrence of the comprehensive pipe gallery, and analyzing an influence degree factor after the danger occurrence of the comprehensive pipe gallery; according to the possibility factor of dangeroccurrence of the utility tunnel and the influence degree factor after danger occurrence, carrying out hierarchical division on the possibility of danger occurrence and the influence degree after danger occurrence respectively; respectively calculating the comprehensive weight of the possibility factor to the danger possibility P1 and the comprehensive weight of the influence degree factor to thedanger influence degree P2 by adopting an analytic hierarchy process; carrying out expert scoring on each possibility factor and each influence degree factor, and respectively calculating a danger possibility P1 and a danger influence degree P2; and calculating a state comprehensive score R of the comprehensive pipe gallery by using the danger possibility P1 and the danger influence degree P2. The state evaluation method can perform comprehensive and systematic state evaluation on the comprehensive pipe gallery and is suitable for the practical engineering application.

The invention discloses a method for testing internal stray radiation of a thermal infrared spectrometer. A radiation test is respectively performed on a full response band of a detector and a spectral channel of the thermal infrared spectrometer at an integration time by using a black body, an equivalent gray value and radiant flux of the internal stray radiation in the current state of the system can be measured by respectively performing a test on the detector and the spectrometer via the method, and the gray value and the radiant flux of the the internal stray radiation of the thermal infrared spectrometer at any integration time and any optical machine temperature can be obtained in combination with the optical machine temperature during the test. The method disclosed by the inventionis simple, can be used for effectively solving the problem that the internal stray radiation of the thermal infrared spectrometer seriously affects the system radiation precision and the system quantification, and is suitable for practical engineering applications.

The invention, which belongs to the technical field of automatic scheduling automation field of the power system, especially relates to a robust state estimation method in a mixed integer quadratic programming mode. The method comprises: a voltage vector a node i is expressed in a right-angle coordinate mode and an injected active power and an injected reactive power of the node i are obtained; three equivalent two-winding transformers are used for expressing a three-winding transformer and all branch circuits in the power system network are expressed by using a unified pi type branch circuit; according to an equivalence circuit graph of the pi type branch circuit, branch circuit active powers and reactive powers from the node i to a node j as well as a voltage amplitude measurement equation of the node i are obtained, and a robust state estimation model in a mixed integer quadratic programming mode is also obtained; an initial value of an MIQCP robust state estimation model is obtained by using a WLS state estimation method; the MIQCP robust state estimation model is resolved and a defective measurement value is found and eliminated; and the corrected measurement value is calculated again by using the WLS state estimation method.

The invention aims at the defect of an existing network-province two-level automatic generation control (AGC) dynamic optimization dispatching method, and proposes a two-layer planning-based network-province two-level coordinated dispatching method of an AGC machine set. By the two-layer planning-based network-province two-level coordinated dispatching method, coordination among different interest bodies of a network dispatcher and each provincial dispatcher can be achieved, network-province two-level frequency modulation responsibility is determined, safety constraint and assessment index are met, and minimum total cost is simultaneously achieved.

The invention discloses a high-capacity off-grid micro-grid hybrid frequency modulation method which comprises the steps of: configuring energy storage into two parts of voltage frequency type (VF) energy storage and power type (PQ) energy storage; coordinating a controller to acquire a system frequency, and communicating with energy storage by a rapid bus; determining which interval the system frequency is positioned in, and according to different intervals, giving out control strategies; and by a PQ energy storage power supply, transferring an energy storage power supply output. The controlmethod disclosed by the invention can reasonably allocate the energy storage output; the PQ energy storage power supply can be used for generating economic benefits in a normal case, and can be used for keeping stability of a system when a VF energy storage power supply approaches to a full-power operating case; a working environment of the VF energy storage power supply can be optimized, and working stoppage of the VF power supply, which is caused by electric quantity abnormality, is prevented; and in a case of keeping economic benefits of the off-grid micro-grid system, stability of the system is improved, and the high-capacity off-grid micro-grid hybrid frequency modulation method is suitable for actual engineering application.

The invention provides a power distribution network double-time-scale state estimation method and system. The method comprises: acquiring measurement data of state variables under different time scales based on an advanced measurement system AMI and a data acquisition and monitoring control system SACDA; Substituting the measurement data into a pre-constructed power distribution network double-time-scale state estimation model for solving to obtain an estimated value of the state variable; Wherein the power distribution network double-time-scale state estimation model comprises the step of carrying out same-time-scale processing on measurement data of state variables under different time scales. According to the estimation method provided by the invention, the measurement data of the AMI are subjected to the same time scale processing, the direct fusion of the two kinds of data is realized, and the calculation efficiency and the state estimation precision are improved.

The invention, which belongs to the scheduling automation field of the power system, discloses a hyperbolic cosine type robust state estimation method for a power system state. The method comprises: an injected circuit active power, an injected circuit reactive power, a branch active power, and a branch reactive power of a power system node and a node voltage amplitude parameter are extracted; a hyperbolic cosine type robust state estimation model is established; and the hyperbolic cosine type robust state estimation model is solved by using a primal-dual interior-point algorithm. The calculation example analysis demonstrates that a plurality of bad data including data with poor consistency can be suppressed effectively during the estimation process, so that the good robustness is displayed. Moreover, the calculation efficiency is improved; and the method is suitable for practical engineering application.

The invention puts forward a surrounding tracking method for a moving target on the basis of distance measurement, and belongs to the field of robot target tracking. The method comprises the followingsteps that: firstly, under a plane coordinate system, establishing the kinetic model of a mobile robot; then, taking a target to be tracked as a center of a circle to establish a polar coordinate system, and transforming the kinetic model of the mobile robot to be under the polar coordinate system from the plane coordinate; and finally, on the basis of distance measurement, designing a controlledquantity, and controlling the mobile robot to realize the surrounding tracking of the moving target. By use of the method disclosed by the invention, only distance measurement is required to serve asa feedback variable so as to be simple in design, the global stability of a control method can be guaranteed under a situation that the initial state of the mobile robot is not restricted, and in addition, the design of the control parameter does not depend on the initial position of the mobile robot. By use of the method disclosed by the invention, the moving target can be effectively tracked, reliability is high, and the method is suitable for engineering application.

The invention relates to a short-range correction calibration method suitable for a laser scanner. The method comprises the following steps: S1, respectively arranging a plurality of pairs of target balls on two sides of a scanning line of the laser scanner; S2, scanning by using a scanner to obtain the center coordinates of the target ball; S3, using a total station for measuring and obtaining the center coordinates of the target ball; S4, screening out target balls which can be used for calibration; and S5, calculating a short-range correction value. The invention has the following advantages: 1) the problem of short-range calibration of the scanner in subway tunnel mobile scanning is solved; 2) a metro tunnel measurement distance and a measurement mode are simulated to carry out target ball arrangement, wherein a calibration result is more in line with a tunnel measurement use environment; 3) the center of the target ball is fitted by scanning points of the scanning target ball, the algorithm precision is high, the robustness is strong, and 4) the operation is simple and convenient, and the method is suitable for practical engineering application.

The invention belongs to the technical field of special cement, and particularly relates to a manganese slag supersulfate cement and a preparation method thereof. The manganese slag supersulfate cement is prepared from the components in percentage by weight: 30-40% of manganese slag, 25%-50% of granulated blast furnace slag powder, 10-20% of sulfates, 5%-10% of a sulfate activator, 1-5% of an alkaline component and 0.05-2% of an alkaline activator. The manganese slag which is a high-temperature slag waste discharged during the blast furnace smelting process of manganese iron or silicomaganeseis used as a main raw material, a material science principle is combined, the mineral characteristics of manganese slag and slag are taken as a basis, the potential hydration activity of the manganeseslag is activated by using sulfates and alkaline environment to form the initial strength, and novel manganese slag supersulfate cement with excellent properties is further designed.

The invention provides a counter range dragging method based on alpha-beta filtering. The method comprises the steps of (S1) carrying out alpha-beta filtering on a target movement trajectory continuously, (S2) if an AGC has a falling edge jump, going to a step (S3), otherwise assigning a memory tracking distance with a filtering distance, and going to the step (S1), (S3) carrying out extrapolation initialization, and assigning the extrapolation speed of memory tracking with a current filtering speed, (S4) carrying out memory extrapolation according to a memory tracking distance of a final time and the extrapolation speed before interference, (S5) if a difference between the memory tracking distance and an actually measured difference is larger than a threshold, performing a step (S6), otherwise returning to the step (S4), (S6) sending the memory tracking distance to correct a range gate, (S7) if the differences between the memory tracking distances and actually measured differences of 100 consecutive frames are larger than a threshold, performing a step (S8), otherwise returning to the step (S4), and (S8) correcting the memory tracking distance and the extrapolation speed with a filtering value, and returning to the step (S4). The method has the advantages of a small amount of alpha-beta filtering calculation and high real-time performance, the method is used for counter range dragging, the requirement of speed measuring precision can be greatly reduced, and the method is suitable for practical application of engineering.

The invention discloses a method for determining sandy soil Duncan-Chang model parameter through straight shearing and single-shaft compression tests. The method comprises the following steps of (1) obtaining the sandy soil inner friction angle phi tr through direct shearing tests; (2) obtaining a plurality of values of sandy soil lateral confinement compression modulus Es through single-shaft compression tests; (3) calculating a plurality of values of the volume modulus B; obtaining the value of a parameter kb and the valve of a parameter m; (4) obtaining a value of a parameter k according to the expression of the volume modulus B or the value of any one volume modulus B so as to finally obtain the values of the parameter k, the parameter n, the parameter m, the parameter phi tr and the parameter kb of a sandy soil Duncan-Chang model. Through the improvement on the types of the critical intermediate parameters, the parameter test obtaining modes and the like, compared with the prior art, the method can effectively solve the problem of obtaining difficulty of the sandy soil Duncan-Chang model parameter through tests.