806results about How to "Improve operating economy" patented technology

The invention relates to a large grid real-time scheduling method for accepting access of wind power, which belongs to the technical field of power system operation and control. The method comprises: according to the characteristics of wind power and load fluctuation and the control characteristics of generator sets, classifying the generator sets in the whole grid; acquiring the current plan, real-time output, connecting line plan, numerical weather prediction and other related information of each generator set; performing ultrashort period load prediction and wind power output prediction towork out the output regulation amount at next moment of real-time scheduling generator sets and construct an active real-time scheduling model with the smallest wind loss; working out the output regulation amount of the real-time scheduling generator sets including the wind power generator sets by using a simplex method; and transmitting the next output regulation amount of thermal power generator sets directly, and giving the output maximum value at next moment of the wind power generator sets. In the invention, the combined optimized scheduling of the wind power generator sets and traditional generator sets is performed to eliminate wind power generation prediction deviation and load prediction deviation in advance, so the wind power accepting capability of a power grid is improved to the maximum extent while the operation economy of the power grid is guaranteed.

The invention discloses a two-stage coordinated optimization and control-based running method of a combined cooling heating and power supply type microgrid. The running method comprises the steps of 10) performing inter-day rolling dispatching of the combined cooling heating and power supply type microgrid, in which optimal dispatching is performed by taking minimum running cost of the combined cooling heating and power supply type microgrid as an optimal target and combining forecast renewable energy generation power and load demand according to a running constraint condition of the system, and rolling output of each equipment and electricity purchase or sale quantity from a power grid are determined; and 20) building a real-time dispatching module of the combined cooling heating and power supply type microgrid, correcting an inter-day rolling dispatching result by taking dispatching fluctuation penalty-based minimum running cost of the combined cooling heating and power supply type microgrid as the optimal target and combining the renewable energy generation power and a load demand real-time value according to a real-time running constraint condition, and determining real-time output of each equipment in the combined cooling heating and power supply type microgrid and an electricity purchase or sale quantity real-time value. By the running method, the purpose of running economy and stability of the combined cooling heating and power supply type microgrid is achieved.

The utility model discloses a present city power network comprehensive evaluation system based on analytical hierarchy process and Delphi method. The system classifies and layers the characters of the city power network and then forms an integrated system including a plurality of layers according to the relationships and the differences between the characters of the city power network. The endmost character of the system is first evaluated, and then calculation is performed one layer after another according to definite calculation methods, finally a comprehensive and integrated evaluation of the city power network is obtained. The higher the comprehensive score, the better the whole situation of the city power network; namely, the construction technology rationality, the operation safety, the power supply quality and the operation economy of the power network all reach to a high level.

The invention discloses a direct current traction power supply system and a protective method, and utilizes direct current protective device outlet information and a short circuit fault mark value as a criterion to judge various direct current short circuit faults. When the short fault occurs, an alternating current incoming line breaker closest to a fault element is subjected to brake separating; if the sum of the fault mark values of the element, measured and computed after the brake separating, is more than or equal to 1, permanent fault is determined, the alternating current incoming line breakers of other traction substations in the whole line are subjected to brake separating, and related direct current isolation switches are subjected to brake separating to enable the alternating current incoming line breakers of the traction substation in the whole line to be subjected to switching on, so the power supply of the system can be restored; and if the sum of the fault mark values of the element is smaller than 1, the fault is instant, and related breakers are switched on for restoring the power supply of the system. The direct current traction power supply system and the protective method are capable of omitting the direct current breakers and saving investment, convenient to implement, suitable for carrying out new line construction or old line transformation in occasions where the lines are not very long (for example in 20m and less than 10 traction substations). When the line is overlong, the traction power supply system can be subjected to partition by a small amount of direct current breakers.

The invention discloses a digital electric-hydraulic synchronous control system, which comprises a hydraulic actuating mechanism, a digital synchronous control mechanism for performing synchronous control on the hydraulic actuating mechanism, an electric-hydraulic power source for providing power oil for the hydraulic actuating mechanism and the digital synchronous control mechanism, and an electric-hydraulic control system for controlling the power source and the synchronous control mechanism. The hydraulic actuating mechanism is a hydrocylinder; the electric-hydraulic power source comprises an oil storage tank, a double-acting hydraulic oil pump and a driving motor; the electric-hydraulic control system comprises a detector for detecting the oil pressure of the hydraulic oil pump and the rotating speed of the motor respectively and a variable frequency speed regulator and a controller for controlling the motor; and the digital synchronous control mechanism comprises a digital synchronization valve, a digital synchronization controller and a displacement transducer for detecting the displacement of an output shaft of the hydrocylinder. The digital electric-hydraulic synchronous control system has the advantages of simple structure, simple and convenient use and operation, good use effect, energy conservation and no oil leakage, and can achieve the aims of stepless speed regulation and high-precision synchronization according to operating characteristic requirements of different types of controlled objects.

The invention provides an isolated micro-grid hybrid energy storage optimal configuration method. Micro-grid power supply load unbalanced power and total loads in a micro-grid are integrally considered, influences of factors that intermittent energy and load conditions fluctuates with time in the system on isolated micro-grid hybrid energy storage capacity configuration are comprehensively considered, and the isolated micro-grid hybrid energy storage capacity optimal configuration is established; in addition, a genetic algorithm is utilized for solves isolated micro-grid hybrid energy storage capacity optimal configuration models corresponding to different splitting and decomposition modes of the power supply load unbalanced power, and an isolated micro-grid hybrid energy storage optimal scheme more according with reality is determined by selection, so that the practical isolated micro-grid hybrid energy storage configuration programming requirements are better met, the utilization rate and the service lifetime of the isolated micro-grid hybrid energy storage capacity configuration are improved, the operation economy is enhanced, the comprehensive utilization cost of the isolated micro-grid is lowered, and the isolated micro-grid hybrid energy storage optimal configuration method can be widely applied to hybrid energy storage capacity optimal configuration of the isolated micro-grids.

The invention discloses a power-system economic dispatching method considering power grid topology optimization. A power-system dispatching model using active power of conventional generator sets and output component states of the power grid as decision making factors is provided by incorporating the power grid topology optimization into a power-system economic dispatching model and considering the power grid topology connectivity conditions. Topological connectivity is constrained based on the minimum cutset concept in graph theory so as to judge system topological connectivity. The provided model is solved by combination of genetic algorithm and linear programming primal-dual path following interior algorithm. Conventional generator sets and power grid topology can be preset, economical efficiency of power grid operation is improved on the premise of guaranteeing safety of power grid operation, balance capacity of load power of system generation is improved, renewable energy power generation can be accepted within a larger range, abandonment of renewable energy power generation or load shedding is effectively alleviated, and technical support is provided for intelligent development for power system dispatching.

The invention relates to a method for preparing fuel gas by gasifying biomass materials and a device thereof, belonging to the technical fields of methods for preparing fuel gas by solid biomass materials in a gasifying process and the devices thereof. The method comprises the following steps: feeding, gasifying, dedusting, spraying and purifying, detarring, pumping front-end gases and conveying rear-end fuel gas by a Roots blower, and conveying the fuel gas to a fuel gas storage cabinet through a tempering preventing device. The device realizing the method comprises a feeding mechanism, a controllable gasifying furnace and a circulation water pump, a gravity deduster, a spraying purifier and a spraying pump, a biomass tar purifier, the Roots blower, the tempering preventing device and thefuel gas storage cabinet. The device is used for transforming the solid biomass materials of straws and the like into the fuel gas with less impurities and high heat value and supplying the fuel gasfor users centrally.

The invention discloses a circulating fluidized bed garbage incineration boiler and a pollution control system with the same, which relate to a garbage incineration boiler and a pollution control system with the same, and aim to solve the problems that the conventional circulating fluidized bed garbage incineration furnace difficultly discharges slag and is required to be stopped regularly to remove the slag and the economy of a garbage incineration plant is influenced. According to the scheme I, a circulating fluidized bed and double V-shaped wind distributing plates are arranged in a boiler body, the boiler body, a separator, a flue gas cooling chamber and a tail flue are communicated in sequence, an upper level low-temperature superheater, a lower level low-temperature superheater, a primary wind air preheater, a secondary wind air preheater, an upper level primary wind economizer, a lower level primary wind economizer, an upper level secondary wind economizer and a lower level secondary wind economizer are arranged in the tail flue, and the separator is communicated with the boiler body by a U-shaped valve; different from the scheme I, the scheme III is characterized in that: double inverted V-shaped wind distributing plates are adopted; different from the scheme III, the scheme V is characterized in that: an inverted V-shaped wind distributing plate is adopted; and according to the scheme II, the scheme IV and the scheme VI, a semidry reaction tower, a bag-type dust collector, an induced draft fan, a chimney, a fly ash cabin, a lime slurry preparation system, a rotary atomizer and an active carbon injecting device are added on the basis of the scheme I, the scheme III and the scheme V. The circulating fluidized bed garbage incineration boiler and the pollution control system with the same are used for incinerating garbage, and pollutant emission can be controlled.

A dynamic reconstruction method considering distributed power supply and soft switch access for a power distribution network comprises the steps of building a source-load stochastic model, and performing stochastic power flow analysis on the power distribution network, wherein source-load stochastic model comprises a wind power generation system stochastic model, a solar photovoltaic power generation system stochastic model and a load stochastic model, and the stochastic power flow analysis of the power distribution network is based on a cumulant method; building an intelligent soft switch running model and a dynamic network reconstruction model, wherein the intelligent soft switch running model is expressed by capacity constraint of an intelligent soft switch converter, and the dynamic network reconstruction mathematical model comprises a target function and a constraint condition; and solving the built models by employing a genetic algorithm. The network reconstruction problem of thepower distribution network containing a distributed power supply and an intelligent soft switch is solved, a load among feeders of the power distribution network is balanced, the integral power flowdistribution of the system is improved, the overload is eliminated, the voltage level is improved, the electric energy quality and the power supply reliability are improved, the network loss is effectively reduced, and the running economy of the power distribution network is improved.

The invention discloses an electric automobile charging station charging/discharging scheduling method capable of accelerating the absorption of renewable energy sources. The electric automobile charging station charging/discharging scheduling method comprises the following steps: (1) absorbing the renewable energy sources at maximum the day before based on power generation output of the renewable energy sources, load demanding, power demanding of an electric automobile charging station andresidual electric quantity predication informationnext day, and minimizing the power generation cost of an adjustable set to be an optimized target; determining a charging/discharging plan of the electric automobile charging station the day before and an output plan of the adjustable set the day before; and (2) aiming at the renewable energy sources, load, electric automobile demanding and a short-period predicated result of the residual electric quantity at a remaining period in the day, and taking maximized absorption of the renewable energy sources at the remaining period of the current moment as a target, rolling to revise a charging/discharging plan of the electric automobile charging station in the day before. With the adoption of the method, the renewable energy sources can be absorbed to a certain extent and regulation and control pressure of an active power distribution network is alleviated; and the total operation cost of a system is reduced and economic and efficient comprehensive utilization of resources in the active power distribution network is realized.

The invention discloses a multi-objective optimization system and a multi-objective optimization method containing a composite energy storage micro grid. The multi-objective optimization system containing a composite energy storage micro grid is composed of a micro grid central controller, an energy storage controller, a photovoltaic controller, a load controller, and a communication network. According to the multi-objective optimization method containing a composite energy storage micro grid, a multi-objective optimization model is established for a grid-connected composite energy storage micro grid including photovoltaic batteries, flow batteries, lithium batteries and other energy storage devices, with the purpose of minimizing micro grid electricity purchasing cost and tie line power fluctuation. The weighting coefficient is determined based on a two-person zero-sum game method, and the model is converted into a single-objective optimization problem and solved using a linear weighted method. By adopting the multi-objective optimization system containing a composite energy storage micro grid, the utilization rate of renewable energy of the micro grid can be maximized effectively, tie line power fluctuation and distributed power supply grid-connected operation shock can be reduced, and the economical efficiency of micro grid operation can be improved.

The invention provides a preheating catalytic-oxidation device with burner starting for coal mine ventilation air methane, and belongs to the technical field of ultralow-concentration methane oxidation; the device comprises a ventilation air methane gas supply system, a preheater and a reaction chamber disposed in a housing, a burner heating starting system, a gas intake system, a heat extractionsystem, and a measuring and controlling system, wherein a uniform-temperature uniform-flow bed layer and a catalytic-oxidation bed layer are orderly disposed in the reaction chamber along the gas flow direction, and hot gas generated by the burner heating starting system is delivered into the gas intake system. After the starting of heating in the reaction chamber, the ventilation air methane is fed into the preheater to be heated to a high temperature, and is oxidized into carbon dioxide and water in the catalytic-oxidation bed layer; a part of the oxidized hot gas is allowed to enter the heat extraction system for heat extraction and utilization, and the other part is allowed to enter the preheater for transferring heat to fresh ventilation air methane entering the preheater and for cooling, and then is discharged into atmosphere through a exhaust gas outlet. The invention has the advantages of compact structure, low power dissipation, simple operation, high reliability, flexible fuels, and the like.

The invention discloses a flue gas composite phase change dust removal and desulfurization device. The device comprises a desulfurizing tower (10). The lower portion of the side wall of the desulfurizing tower (10) is connected with an inlet flue (11). The upper portion of the side wall of the desulfurizing tower (10) is connected with an outlet flue (12). A vortex phase changer (13) is arranged on the inlet flue (11) of the desulfurizing tower (10) and comprises a plurality of sets of atomization nozzles (18). The atomization nozzles (18) are symmetrically arranged on the side wall of the inlet flue (11). Openings of the atomization nozzles (18) face the interior of the inlet flue (11) and are eccentrically arranged relative to the inlet flue (11). Spraying water sprayed by the atomization nozzles (18) in the vortex phase changer (13) can enable flue gas in the inlet flue (11) to generate rotational flow. The invention further discloses a flue gas composite phase change dust removal and desulfurization technology. The composite phase change condensation principle is utilized for enabling supersaturated water vapor to be condensed on the surfaces of fine particles, and the fine particle collection efficiency of the desulfurizing tower is improved.

The invention provides a flue gas desulfuration control system for large coal-fired power plant and comprises an imaginary machine part which is a flue gas desulfuration simulation platform, a DCS control system which comprises control points arranged at in-site in a scattered way as well as working stations, monitors, printers, data servers and dual redundant optical fiber circular communication networks used for interconnection of the components; a real electricity part which is a real electricity part for flue gas desulfurization simulation platform and comprises an in-site input signal collection system, an in-site measurement and control instrument and an executing mechanism for simulation platform output signal. In addition, the real electricity part collects simulation signal and state of device coherent with in-site signal and sends into the flue gas desulfuration simulation platform through the DCS control system for performance check and control operation, and then outputted signal gets into the executing mechanism through the DCS control system and control of real device is realized. The invention is good for research and development of process, new technology and electrically controlled device of large desulfuration device, and then effectively controls carbon dioxide pollution of atmosphere and protects environment.

The invention provides an apparatus and a method for producing microbubbles. Fluid in which gas is dissolved under pressure with a pump 1 flows into a porous plate unit 4 and when passing through the porous plate, the fluid is decompressed and dissolved gas is deposited to form microbubbles. A controller 3 changes rotational frequency of the pump 1 via an inverter 2 to control an ejection flow rate of microbubble-containing water 11. At the same time, the controller 3 changes the number of pores in a narrow flow passage via a driving gear 7 to keep pressurizing pressure above a minimum value of pressure required for producing microbubbles and below a predetermined maximum value.

The invention discloses a comprehensive energy station equipment type selection and capacity planning method considering various energy storage devices. The method comprises the following steps: inputting energy conversion and energy storage equipment parameters according to the type and energy form of to-be-selected equipment of a comprehensive energy system in a park; establishing a comprehensive energy station equipment type selection and capacity planning model considering various energy storage equipment according to the input parameters; solving by adopting a mixed integer linear programming method based on historical data of electricity, heat and cold loads, illumination intensity and wind speed in the park according to a comprehensive energy station equipment model selection and capacity planning model; and outputting a solving result which comprises an equipment type selection and capacity planning scheme, the annual comprehensive cost of the system and the annual consumptionof electricity/gas. According to the planning scheme, the requirements of multiple loads of cooling, heating and power can be met at the same time, the system operation economy is remarkably improved,the annual comprehensive cost of the comprehensive energy system can be remarkably reduced, multi-energy complementation is achieved, and the energy utilization efficiency is improved.

The invention discloses a park comprehensive energy system equipment model selection and capacity planning method considering electric energy storage. The method is based on solving the problems of equipment type selection and corresponding capacity planning in a park comprehensive energy system containing energy storage. The minimum annual comprehensive cost is taken as an objective function, operation constraints and power balance constraints of electric energy storage equipment and various energy conversion equipment of a comprehensive energy system in a park are fully considered, a mixed integer linear programming method is adopted for solving, and finally an equipment type selection and capacity planning scheme is obtained. According to the method, the effects of improving energy space-time distribution and improving operation economy of the electric energy storage system are fully considered, and a mixed integer linear programming solver is adopted for optimization calculation, so that equipment model selection and capacity planning are more scientific and accurate.