224results about How to "Clear concept" patented technology

The invention discloses a fast decoupled flow calculation method for power systems, which comprises the following steps of: inputting original data and initializing voltage; forming an admittance matrix; forming correction equation coefficient matrixes B' and B'' and performing factor table decomposition; performing P-theta iteration, and correcting a voltage phase angle; performing Q-V iteration, and correcting voltage amplitude; judging whether the iteration is converged; and calculating node power and branch power. The method requires that the P-theta iteration and the Q-V iteration are all converged in the same iteration and the iteration process is finished, so that the algorithm frame is simpler, and the flow is clearer. The sparse matrix technology is not adopted, so the matrix elements are convenient to access and calculate, and the programming is simple; the correction equation coefficient matrixes are stored according to n order, number change of nodes is avoided, and the programming difficulty is reduced; and the calculation amount is reduced through reasonable logic judgment, the calculation speed is obviously improved and the requirement of scientific research can be completely met. The fast decoupled flow calculation method also can process power systems with a plurality of balance nodes.

The invention discloses a method and system for utility boiler combustion subspace modeling and multi-objective optimization, belongs to the field of utility boiler optimization operation, and particularly relates to a method and system for setting up of a high-precision combustion model and solution of multi-objective optimization. The method includes the following steps of determining input variables of a combustion optimization model, determining the variable to be optimized from all the input variables, dividing a load into a plurality of sectors with the neighborhoods overlapped, setting up a combustion subspace ANFIS model for each sector in an off-line mode, collecting data in real time, conducting partial subspace model modification in an on-line mode, conducting on-line multi-objective optimization by taking the constraint of a unit load into consideration, taking maximizing the boiler efficiency and minimizing the nitrogen oxide emission as targets, and utilizing a mature global optimization algorithm and on the basis of comprehensive cost minimization, and separating and implementing the optimization result. The method and the system are suitable for combustion optimized operation of a coal powder utility boiler and have the advantages of being high in modeling accuracy and high in optimization speed.

The invention relates to a method for detecting positive sequence, negative sequence, idle and harmonic currents of a power supply system. The detection method is based on three-phase voltage space vector oriented positive sequence synchronous coordinate rotation transformation, negative sequence synchronous coordinate rotation transformation and low-pass filtering. The method is very effective for detecting various positive sequence, negative sequence, idle and harmonic currents of three-phase four-wire and three-phase three-wire non-linear circuits. The method only transforms the tested current, and does not need to transform voltage. Therefore, the invention has the advantages of simple structure and clear conception. The invention is the simplest engineering method for dynamic and static idle and harmonic compensation.

The invention discloses a power distribution network medium-voltage line route planning method based on city utility tunnels, and belongs to the technical field of power distribution network planning. The method mainly comprises the following steps: S1, establishing a medium-voltage line power supply planning area; S2, establishing a medium-voltage line route planning model; S3, optimizing a line route based on Dijkstra algorithm; S4, completing line connection on the basis of an increment shortest path method. The route planning is divided into two steps by establishing a medium-voltage line route planning model in power distribution network planning under the construction background of new city district utility tunnels: firstly using a shortest route method to primarily form a power supply network, and realizing optimization for cable route in grid to complete trunk line planning; and then completing line connection based on an increment shortest route method. Compared with a heuristic algorithm, the method has the characteristics of clear concept, high calculation speed and good planning effect. The planned power distribution network medium-voltage line is applicable to the construction condition of city utility tunnels, and is minimum in comprehensive investment cost and shortest in cable route.

The invention discloses a broadband wire source for a planar waveguide CTS antenna feed device. The broadband wire source comprises an H-plane sectorial horn antenna, a bias parabolic reflection plane and a flat waveguide. The H-plane sectorial horn antenna and the bias parabolic reflection plane are arranged inside the flat waveguide, and the phase center of the H-plane sectorial horn antenna is arranged at the focus of the bias parabolic reflection plane. According to the invention, cylindrical waves are converted into plane waves, the plane waves are generated by using a reflector antenna principle, and the horn antenna is arranged at the focus of a paraboloid reflector so that a horn antenna radiation field passes through the reflector and generates the plane wave with equal amplitude and the same phase at the caliber surface of the reflector. The working frequency band is wide; the feed source shielding is eliminated and the caliber efficiency is enhanced through a bias; the structure is enclosed so that the edge diffraction effects of a conventional bias paraboloid are removed; and the structure is simple so that adjusting and assembling are easy, late use and maintenance are convenient, and the problem can be solved that the ideal wire source with equal amplitude and the same phase, generated by a conventional waveguide CTS antenna, cannot be realized in an actual project.

The invention discloses an MEMS inertial navigation system and a track reconstruction method based on the same. A six-position method is applied to error factor identification on a gyroscope and an accelerometer, a static error model is obtained, and therefore static errors are compensated; the random error of the gyroscope and the accelerometer is remarkably reduced through filtering of a low pass filter, noise is lowered, and output precision is improved. A complementary filter algorithm is adopted for effectively combining the updated attitude angles of the gyroscope and the accelerometer to obtain an attitude matrix. The attitude matrix is used for acceleration conversion and gravity compensation, and then the triaxial acceleration of a navigation module in an inertial coordinate system is obtained. Finally, track and speed information is obtained through iterative dual integration. The independently solved attitude angles of the accelerometer and the gyroscope are combined through the complementary filter algorithm, divergency of drifting of the attitude angles can be restrained, and attitude calculation is greatly improved in a dynamic state and a static state.

The invention discloses a reliability assessment method for a power grid multi-link system. According to the method, influences of a power transmission network on the reliability of a power distribution network are quantified through the equivalence of the reliability of a load and the reliability of a power supply, the limitation of the assumption that traditionally the reliability of a traditional power distribution network is that the power supply is completely reliable is broken, and a calculation result accords with engineering practice of the power grid; in the method, a loop is used as the basic unit of a reliability assessment of the power transmission network, and a preconceived accident set is further formed, so that the system condition number in the preconceived accident set is substantially reduced, and the statistic analysis of engineering data of the reliability is facilitated. The reliability assessment method can be used for analysis of the sensitivity of reliability indexes to reliability parameters and enhancement measures relevant to the power transmission network or the power distribution network, and consequently planning, operation and maintenance of a power supply enterprise can be guided.

A method for measuring anti-balance heat efficiency of boiler in fuel oil condensing type includes selecting datum and reference temperature; analysing fuel composition; measuring fuel heating value, air pressure and air relative humidity, volume content of composition in smoke, temperature of smoke fuel, consumption and condensed water in smoke; selecting method for calculating heat efficiency and utilizing model to operate out boiler heat efficiency.

A method of verifying reasonable working resistance of a working face hydraulic support includes the steps of measuring and calculating four resistance values p required by verification of working face support reasonable working resistance, and a sum of the values; measuring and calculating working face roof settlement delta hi; dividing working face roof control effects; determining a support reasonable working resistance alternative Ri; counting a ratio A1 of support end resistance ri during working face roof weighting, exceeding the values p and the sum; verifying working face support reasonable working resistance R. The method has the advantages that finished working face support reasonable working resistance and the efficiency of determining the support reasonable working resistance is greatly improved in terms of methodic systemization and parameter quantification.

This invention relates to a method for identifying traveling waves of super-high voltage DC circuit faults, which applies a reverse identification method: A, judgment of fault pole: Wcx=Diff_bx(t)*Com_bx(t), in which, x=1,2, if the short time integral value of Wcx is greater than a constant value, then it is decided that the local pole is fault, otherwise, it is not, B, abrupt volume of traveling waves, C, integral volume of the traveling waves, D, testing if the DC current is over the constant value or the DC voltage meets the criterion of the low constant value, A to C or D make up of the action conditions of the circuit traveling wave protection.

The invention discloses a combined decision method for power generation plans of a multi-type power supply. The multi-type power supply includes a power generation system composed of thermal power, wind power and hydropower. According to the combined decision method, an optimal start/stop state of a thermal generating set is selected according to requirement information of the power grid as well as a power balance analysis result; an optimization model coordinated with the multi-type power source is established, active output of wind power-thermal power-hydropower sets is optimized in a combined manner; and the safety of an active output plan of the multi-type power supply is checked, a start/stop plan of a thermal power set is corrected by iteration, and a combined power generation plan of the multi-type power supply is generated finally. According to the method, wind power prediction data is introduced into power balancing, start/stop of the thermal power set is arranged in advance, and a peak-clipping and valley-filling function of a hydropower set is used, so that a combined decision for a power generation plan for the thermal power, wind power and hydropower included power supply is realized, the generating amount of the thermal power set is replaced or reduced, and the clean energy consumption level of the power grid is improved.

The invention discloses a vehicle-bridge-storm flow coupling vibration analysis method for a road-railway bridge. According to the method, a vehicle subsystem, a bridge subsystem and a storm flow coupling field subsystem serve as a unified system by adopting a large system thought. According to static and dynamic interaction among the subsystems and a displacement coordination relationship betweenthe vehicle subsystem and the bridge subsystem, a vehicle-bridge-storm flow coupling vibration equation of the road-railway bridge is established; and by adopting a separated iterative method, dynamic responses of the vehicle subsystem and the bridge subsystem are solved, thereby evaluating running safety and comfort of vehicles and trains passing the road-railway bridge under the action of a storm flow coupling field. The dynamic effects of the vehicles and the trains can be considered at the same time; the static and dynamic effects and the aeroelastic and hydroelastic feedback effects of the storm flow coupling field on the vehicle subsystem and the bridge subsystem can be considered at the same time; and an effective method is provided for driving safety evaluation of the cross-sea road-railway bridge.

The invention develops an urban power grid program comprehensive assessment system based on a gray analytic hierarchy process. Firstly, the system utilizes Delphi expert consulting method to determine main factors which influence power network programming, and integrates basic ideas of the analytic hierarchy process to form a complete power grid program assessment index system comprising a plurality of hierarchies. Then an analytic hierarchy process is utilized to respectively calculate the weight of attributes of the end of the system. Secondly, a plurality of experts are selected to carry out marking on a power network program related to the weight of the attributes of the end of the system, and then the gray analytic hierarchy process is utilized to calculate the scores of the power network program given by the experts, and further weight coefficients of the selected experts are determined based on an entropy weight method. At last, comprehensive and integral scores of the power network program are obtained through utilizing a weighting method. The higher the comprehensive scores, the better the power network program is shown to be, that is to say, a programmed power network reaches a high level in terms of four aspects of adaptability, safety, economy, and environmental property.

The invention relates to a method for calculating the stability safety factor of a concrete gravity dam under a multi-dam-section combined skid resistance condition and belongs to the field of gravity dam stability analysis. According to the method, a three-dimensional stability analysis calculation model is established on the basis of a three-dimensional rigid body limit balance analysis and strength reduction method by aiming at a situation that key slots are formed or grouting is performed between dam sections of the concrete gravity dam so as to combine slide resistance; by introducing a plurality of reasonable assumption and unbalanced force transfer concepts, the statically indeterminate problem of combined anti-sliding stability of multiple dam sections along a dam foundation surface is converted into a statically determinate problem; on the basis of solving out the independent anti-sliding safety factor of the dam sections, the transfer of unbalanced forces of adjacent dam sections on a river valley side is considered, circulation calculation is performed, and the overall stability safety factor of combined slide resistance of multiple dam sections, the sequence of sequentially achieving limit balance by each dam section and the local stability safety factor of the dam sections are solved out. The method has the characteristics of easiness for realization of programming, reasonable calculation result and the like, and is convenient in popularization and application in practical engineering.

The invention relates to a grey weighting method for sewage treatment process comprehensive evaluation, and belongs to the field of sewage treatment technology optimization. The grey weighting method comprises the following steps that 1, combined weights of evaluation indexes are determined, i.e., an entropy weight method and an order relation analytical method are respectively adopted for determining objective and subjective weights of evaluation indexes, and then, game theory thoughts are applied to determining the combined weights of the evaluation indexes; 2, the grey correlation analysis theory is applied to determining the optimum process. The grey weighting method has the advantages that the grey weighting method is used as an evaluation process of a sewage treatment process, the whole evaluation process adopts an objective and subjective weighting method, ranging results are enabled to show subjective information and objective information, the evaluation decision method is simple and intuitive, and the computer programming is easy.

The invention discloses a rock slope anchoring calculation method based on safety and economy multi-objective optimization. The rock slope anchoring calculation method comprises the following steps: step 1, drawing up calculation parameters of a rock slope; step 2, carrying out stress analysis on the rock slope; step 3, establishing a dual-objective function of rock slope safety and economy; step4, establishing a rock slope safety and economy multi-objective optimization nonlinear mathematical programming model which uses the double-objective function and combines rock balance equation constraint conditions, structural surface yield conditions and anchor rod additional constraint conditions at the same time; step 5, constructing an evaluation function by using a weighted sum method, and converting the nonlinear mathematical programming model for solving the multi-objective optimization into a nonlinear mathematical programming model for solving the single-objective optimization; and solving the model by using a penalty function method of nonlinear programming to obtain a safety coefficient and an anchoring cost which meet the optimal safety and economy at the same time, and an optimal anchoring angle. According to the method, the unification of economy and safety is achieved.

The invention discloses an integrated controlled system and an integrated controlled method for dynamic reactive power compensation based on a touch screen, a PLC and a DSP. The system consists of an integrated control arithmetic unit, a TSC and an HVC. The control method comprises the following steps: firstly acquiring the voltage and current of a three-phase power grid and receiving related parameters from the touch screen; computing reactive capacity required by the system at the moment according to a instantaneous reactive power theory and utilizing the PLC to check a target power factor to obtain a most rational compensation loop combination plan; and finally utilizing thyristor cross-zero trigger technology to control a corresponding compensation loop for switching. The system and the method effectively solve the problems that the conventional compensation system cannot perform frequent switching and is low in response speed, low in compensation accuracy and the like, and greatly improve the stability of the system and reduce the running cost simultaneously.

The invention discloses a non-angle operation SVPWM method and a grid-connected inverter system. The non operation SVPWM method includes the following steps that a three-level inverter is regarded as a two-level inverter, only the large vector and the zero vector are considered, a large fan zone where a reference vector exists is judged and action time of all resultant vectors is calculated; through simple comparison and calculation, a small fan zone in a three-level space vector diagram where the reference vector exists and action time of all the resultant vectors can be obtained. The three-level voltage source type grid-connected inverter system comprises a direct-current bus voltage control module, a reference current generating module and a non-angle operation SVPWM module. According to the non-angle operation SVPWM method and the grid-connected inverter system, power of the system can be controlled respectively and meanwhile, complete non-angle operation of the inverter system can be achieved. The two-level space vector is applied in modulation and converted into a three-level space vector in a linear mode and calculation of a trigonometric function is completely avoided, the calculation amount of the controller is greatly reduced, digitalization is facilitated and the non-angle operation SVPWM method and the grid-connected inverter system have obvious advantages in industrial application.

The invention relates to a method for controlling building thermal environment and building energy conservation in an air-conditioning building, which comprises the following steps: calculating out the comprehensive temperature average value and the corresponding wave amplitude value thereof of a horizontal external surface and the west wall external surface of a local building roof according to data information that the temperature average value t0 of the outdoor air in a local air-conditioning building in continuous 5 days in the lately 10 years is more than or equal to 28 DEG C; determining the thermal transmission resistance control index of a roof and a wall in the process of heat preservation in the air-conditioning building; determining the heat insulation and energy conservation three-element control index of the wall, the roof and a window in the air-conditioning building; and controlling the hot working performances of the wall, the roof and the window according to the heat insulation and energy conservation three-element control index. The method gives full play to the use value of the existing meteorological data, adopts a simple method to make the calculation of the control indexes of each energy conservation aspect simple and fast, and has small investment cost. The method applied to the designs of the building thermal environment and the building energy conservation can greatly improve the energy conservation efficiency of the building.

The invention relates to the field of geotechnical engineering, in particular to an evaluation processing method for entrainment superimposed settlement of pile groups. According to the method, by utilizing a solid deep foundation simplified calculation model, a calculation formula for stress fields of surrounding soil bodies of pile foundations is deduced, and from the analysis of the calculation of the settlement of the pile foundations to the calculation of the stress fields and displacement fields of the surrounding soil bodies of the pile foundations, the evaluation processing method for the entrainment settlement of the pile groups is formed, and meanwhile, the entrainment settlement calculation of a single pile group foundation can be expanded to the entrainment settlement calculation of multiple pile group foundations by using the method. The evaluation processing method for the entrainment superimposed settlement of the pile groups provided by the invention has the advantages that the stress fields of the surrounding soil bodies of equivalent pier foundations are completely deduced; a method of classical soil mechanics is introduced into the evaluation method for the entrainment settlement of the pile groups, and therefore, not only can the settlement of pile tips be evaluated, but also the entrainment superimposed influences of the pile group foundations on the surrounding soil bodies can be evaluated. The evaluation processing method for the entrainment superimposed settlement of the pile groups is clear in concept, simple in method and reliable in evaluation accuracy, and convenient for engineering application.

The invention discloses a method for determining the pile spacing of anti-liquefying vibrating-impacting crushed-stone piles. The method comprises the following steps of 1, judging the liquefied degree of foundation soil according to an in-situ test, wherein one or several methods in a, a critical standard penetration number method, b, a static sounding judging method and c, a shear-wave velocity method is or are adopted by the liquefaction judging method of the foundation soil; 2, determining the dry density needing to be reached by the foundation soil among the piles for eliminating liquefaction; 3, determining the pile spacing of the crushed-stone piles. According to the contrastive analysis of the on-site in-situ testing, the indoor test and the finite-element numerical-value analyzing results of the foundation soil before and after driving the crushed-stone piles, the anti-liquefying efficacy of the vibrating-impacting crushed-stone piles is comprehensive studied, and the method for determining the pile spacing of the crushed-stone piles is provided on the basis and on the basis of a compaction effect, so that pile-testing projects are omitted, the construction period is shortened, and the construction cost of the projects is lowered.

The invention discloses a cable and overhead line mixed line double-end traveling wave fault location algorithm based on the piecewise compensation principle. According to the cable and overhead line mixed line double-end traveling wave fault location algorithm, the difference between the time when a fault initial traveling wave surge reaches a measuring point on one side of a line and the time when the fault initial traveling wave surge reaches a measuring point on the other side of the line is compared with the difference between the time when traveling wave propagation at each connecting point of the mixed line reaches the measuring point on one side of the line and the time when the traveling wave propagation at each connecting point of the mixed line reaches the measuring point on the other side of the line to determine a fault section, and then time and distance compensation is conducted to express the fault distance as the sum of the distance from the endpoint of the fault section to the measuring point and the vector distance from the fault point to the endpoint. Compared with an existing mixed line traveling wave fault location method, the cable and overhead line mixed line double-end traveling wave fault location algorithm is higher in adaptability, clearer in concept, easier to implement, and unified with a traditional uniform transmission line two-end fault location algorithm in form and physical meaning.