53results about How to "Improve the level of economic operation" patented technology

The invention discloses a low-voltage transformer area working condition monitoring and three-phase load balancing automatic adjusting system comprising a low-voltage multi-capacity capacitor, an automatic phase-change switch, residual current breakers, a power distribution network monitoring terminal and a system platform. The power distribution network monitoring terminal is connected with the system platform via a GPRS network. The residual current breakers are installed on all power supply branches of a power distribution network low-voltage side which is series-connected with the low-voltage multi-capacity capacitor. The residual current breakers are connected with the monitoring terminal via a 485 communication mode. The automatic phase-change switch is connected with the power distribution network monitoring terminal via a wireless electric power carrier. The low-voltage multi-capacity capacitor comprises multiple isometric charging elements which are connected in parallel. Parallel-connection wires of the isometric charging elements are connected in series with electric control switches so that capacitance compensation level matching is realized. Three-phase load balancing automatic adjustment and reactive compensation capacity level matching can be realized so that electric energy loss in a transformer area is reduced and frequency of three-phase automatic adjusting phase change in peak periods is reduced.

A coordinative control method for supercritical unit boilers quickly adaptive to change of the heat value of fire coal includes quickly calculating the heat value of the fire coal in real time by the aid of parameters including regulating-stage pressure of a steam turbine, pressure of a steam and water separator, coal feeding quantity, load of units and the like by means of combining characteristics of coordinative control objects of the supercritical fossil power units; then adaptively controlling the heat value of the fire coal by the aid of main control systems for fuel, coordination and the like according to the calculated heat value of the fire coal; and finally calculating load instructions of the boilers by the aid of an improved energy balancing method, forming a core control strategy, combining quick adaptive control for the heat value of the fire coal, and forming the coordinative control method for the unit boilers quickly adaptive to the change of the heat value of the fire coal. The calculated heat value of the fire coal can respond to the change of the heat value of the fire coal within thirty seconds, and coordinative control of the unit boilers can be automatically adjusted and a subsystem is automatically adjusted into a corresponding state within two minutes; even if the heat value of the fire coal is in large step disturbance, coordination of the units and control of the subsystem do not need manual intervention under various working conditions such as a stable state, variable load, variable pressure and the like of the units of coordinative control of the unit boilers and the subsystem and various disturbances on boiler and steam turbine sides, and main parameters of the load, pressure and the like of the units can be controlled within specified ranges; and precisions of main controlled parameters of the units can be greatly improved as compared with original convention control, and simultaneously, a safe and economical running level of the units can be improved.

The invention discloses a mixed-coal blending combustion prediction system with a post-evaluation system. During mixed-coal blending combustion of various kinds of coal in a power plant, design parameters, structure features and fuel feature data of the power plant are combined to pre-judging a blending combustion scheme for configuring different kinds of coal and blending combustion proportions for a unit, so burning tests can be reduced, environmental protection and safety risks are avoided and operation economy of the unit is improved. Post-evaluation is performed on the scheme about the mixed-coal blending combustion prediction suggestion through operation data of actual blending combustion to verify whether the scheme is feasible. According to the invention, proper, simple and effective decision technical support is provided for research of mixed coal blending combustion of a target power plant and theoretical and application foundation is laid for the development of the mixed-coal blending combustion technology.

The invention provides a realization method for functions of an adaptive load type distribution transformer. The realization method comprises the following steps of setting adaptive load type distribution transformer motion constant values which include a three-phase load unbalance adjusting constant value, a phase-splitting reactive compensation constant value, a load capacitance-modulating current constant value and a load voltage-modulating voltage constant value, and according to the set adaptive load type distribution transformer motion constant values, performing three-phase load balance control, phase-splitting reactive compensation control, rated capacity operation model adjusting control and voltage tap shift adjusting control. The realization method fulfills an aim of adaptive loads by scientifically setting the load capacitance-modulating motion constant value and combining the three-phase load unbalance adjustment and phase-splitting reactive compensation strategy, helps to effectively reduce operation loss of the distribution transformer and low-voltage network wire loss, improve the economic operation level of the power distribution area and guarantee power supply quality to users.

The invention relates to a day-ahead optimal scheduling method for a comprehensive energy system containing heat accumulating type electric heating. The method is characterized by comprising the following steps: 1, proposing a comprehensive energy system operation optimization objective function containing heat accumulating type electric heating on a power grid interaction level according to income and operation characteristics of heat accumulating type electric heating, and determining the comprehensive energy system operation optimization objective function containing heat accumulating typeelectric heating and constraint conditions thereof; and 2, solving the comprehensive energy system operation optimization objective function containing heat accumulating type electric heating in the step 1 by adopting a simplex algorithm according to the characteristics of the model so as to obtain a planned electric heating load balance scheduling curve of the system and hourly operation output of various heating and energy storage devices. The load impact on the power grid can be effectively reduced, the peak-valley difference of the power grid is reduced, the use efficiency of electric heating equipment is improved, and the heating operation cost of a user is greatly reduced.

The invention provides a molecular sieve catalyst for preparation of aromatic hydrocarbon through methanol conversion. The catalyst comprises: 30-70 parts by mass of a hydrogen-type ZSM-5 molecular sieve, 5-30 parts by mass of a hydro-thermal-treated hydrogen-type mordenite, and 10-30 parts by mass of an adhesive. The catalyst further comprises a metallic element loaded on the hydrogen-type ZSM-5 molecular sieve and a non-metallic element loaded on the hydro-thermal-treated hydrogen-type mordenite, wherein the metallic element is one or more selected from Zn, Ag, Cd, Ga, Co, Mo, Cr, La, and Ce, and is loaded at an amount being 0.5-10 parts by mass based on the mass of the metallic element, and the non-metallic element is one or more selected from P, F, and B, and is loaded at an amount being 0.1-5 parts by mass based on the mass of the non-metallic element. The invention further provides a preparation method of the catalyst and an application of the catalyst to preparation of aromatic hydrocarbon through methanol conversion. The catalyst can effectively optimize product distribution, and improves economic operation level of an MTA industrial device.

The invention discloses a low-cost 63% IACS high-conductivity duralumin conductor and a manufacturing method thereof. The method comprises the steps that firstly, electrician aluminum is smelted, wherein a 99.90% high-purity aluminum ingot is selected; secondly, rare earth treatment and boronizing treatment are conducted on molten aluminum, all elements in the molten aluminum comprise, by mass percent, smaller than or equal to 0.03 wt% of Si, smaller than or equal to 0.06 wt% of Fe, smaller than or equal to 0.005 wt% of (Cr+V+Mn+Ti), 0.01 wt%-0.03 wt% of B, 0.01 wt%-0.03 wt% of rare earth and larger than or equal to 99.88 wt% of Al, and the rare earth includes La, Y and Er; thirdly, the molten aluminum in the second step is continuously cast and rolled, an aluminum rod is produced, the aluminum rod with the diameter phi of 7.5 mm is extruded through an aluminum extruder, and aluminum wires of various shapes and specifications are formed through cold drawing and drawing; and fourthly, the aluminum wires are stranded to form the aluminum conductor according to the design requirement, wherein the tensile strength of the aluminum conductor is larger than or equal to 168 MPa, and the conductor resistance rate is smaller than or equal to 0.027350 omega.mm<2>/m at the temperature of 20 DEG C. The duralumin conductor has excellent electric conduction performance, the cost of the conductor is reduced by 15%-25%, and the economic efficiency of a circuit is further improved.

The invention provides a comprehensive measurement and regulation-control apparatus and method for an active power distribution network. The comprehensive measurement and regulation-control apparatus comprises a main board and a power supply mechanism, wherein the main board comprises a comprehensive decision plugin, an intelligent alternating current sampling plugin which is used for being connected with a current transformer on an outgoing feeder line for collecting the load current of the circuit, and used for being connected with a voltage transformer on a power supply bus for sampling the voltage information of the bus, an intelligent I/O plugin which is used for being connected with a control switch on the outgoing feeder line for sampling signals of various kinds of electrical hard contacts of the active power distribution network, a multifunctional communication plugin which is used for being connected with peripheral equipment and an intelligent power supply plugin.

The invention discloses a construction method and an air conditioner control method for a multi-load joint control strategy, and belongs to the technical field of multi-load joint control strategies. According to an existing control strategy, flexible loads cannot be effectively scheduled and accurately controlled. According to the construction method for a multi-scene multi-load joint control strategy provided by the invention, multi-load response potentials are evaluated, and a reasonable power utilization plan is made according to load characteristics and market response characteristics represented by an evaluation result; a multi-micro-load aggregation model in multiple scenes is further established, and multi-load active response and coordinated optimization are achieved; and the multi-micro-load aggregation model in multiple scenes is used as a part of a combined optimization model of multi-micro-load regional operation scheduling, and multi-scene multi-load joint control is realized. Therefore, hierarchical flexible optimization operation and efficient scheduling of user-side multi-micro-loads are realized, and the dynamic balance capability of a power grid is improved.

The invention relates to a method for determining an optimal value of the operation condition of a gas-steam combined cycle generating unit, and the method comprises the following steps: S1, building an online monitoring and economical operation system of the gas-steam combined cycle generating unit, and collecting the measuring point parameters of the unit; S2, carrying out the classification and screening of the operation conditions of the unit through employing a clustering algorithm, obtaining N stable operation condition classes, and distributing the measuring point parameters, which can reflect the operation condition of the unit, to different stable operation condition classes; S3, carrying out the data mining of the optimal values of the measuring point parameters for each stable operation condition class, obtaining the optimal value of each stable operation condition class, calculating the confidence of each optimal value, and determining the final preferred value of each stable operation condition class according to the confidence. Compared with the prior art, the method facilitates the improvement of economical operation level of the unit.

The invention provides a coastal multi-source multi-load coordination control system and method considering sea water desalination. The coastal multi-source multi-load coordination control system comprises a control center, a new energy power station, an energy storage device, sea water desalination facilities and conventional loads. The control center is used for formulating an optimal day-aheadplan and an optimal intra-day plan, and controlling the new energy storage device and the seawater desalination facilities to be executed so as to carry out coordination control according to acquiredoperation data and meteorological data. Thus, the optimized regulation and control path of the multi-source multi-load seawater desalination process can be accurately provided, the characteristics ofthe energy storage technology are fully utilized, the coastal controllable load and energy storage are adjusted by taking energy storage adjustment as a main principle and controllable load adjustmentas an auxiliary principle so as to track a renewable energy power generation curve, and the consumption requirement of renewable energy in coastal regions is met.

The invention discloses an AVC control method and system based on coordinated control of a phase modifier and a capacitor bank, and a medium. The method comprises the following steps: if a control instruction is within a first specified threshold range, when a set of standby capacitors is brought into AVC coordinated control, the standby capacitors are switched off, and reactive power output is conducted on the control instruction through a phase modifier after power distribution; if the value of the control instruction is within a second specified threshold range, whether there is a set of standby capacitors brought into AVC coordinated control or not is detected; if there is no set of standby capacitors brought into AVC coordinated control, short-time reactive power output is conducted on the control instruction through the phase modifier after power distribution, a set of standby capacitors is switched in, and reactive power reserve of the phase modifier is released; and if there isa set of standby capacitors brought into AVC coordinated control, average output is performed by the phase modifier after the capacitor capacity is subtracted from the control instruction. Under thecondition that the change in available dynamic reactive power reserve of the phase modifier is small, the range of the control instruction can be increased and widened without greatly affecting the reactive group switching instruction of an original DC control and protection system. The method has the advantages of being good in compatibility and convenient for technical upgrade and reconstruction.

The invention discloses an electric meter transformer area identification method based on voltage data. The method comprises the steps that a concentrator (CCO) sends a district identification commandto a whole-network intelligent electric meter through a broadband carrier communication system; the intelligent electric meter on the concentrator side and the intelligent electric meter to be subjected to transformer area identification start to acquire respective voltage data in a specified time period according to command requirements; a communication module in the intelligent electric meter reports acquired voltage data to the CCO through the broadband carrier communication system; after receiving the data, the CCO calculates the voltage data similarity between any two in-phase ammeters in combination with the phase information of the electric meters and the routing information between the electric meters; in order to improve the identification precision, the CCO carries out voltage data collection and similarity calculation for many times in different time periods; and after the collection frequency reaches the specified requirement, the CCO comprehensively judges the transformerarea affiliation relationship of all the intelligent electric meters in the transformer area network based on the data.

The invention relates to an electric vehicle battery charging and replacing service network optimization planning method based on a Floyd algorithm. The method comprises the following steps: step 1, an electric vehicle battery charging and replacing demand model is established or called; step 2, using a Floyd algorithm to carry out site selection planning of the electric vehicle charging and replacing station according to the electric vehicle charging and replacing demand model; step 3, carrying out constant volume planning on the basis of the site selection planning scheme; and step 4, recording the site selection constant volume planning scheme, circularly executing for a plurality of times, and comparing to obtain an optimal site selection constant volume planning scheme. According to the invention, the operation level of the charging and battery swap station is effectively improved, the economic operation level of a power grid is improved, and the distributed power consumption capability is improved.

The invention discloses a system standby capacity reducing transformer station optimization method for self-generation power plant enterprise. The method comprises the steps that 1) the predicted maximal power supply load and the capacity and number of generators of a generator set of the self-generation power plant to be constructed are determined, electric quantity balancing analysis is carriedout on the enterprise, and the construction capacity of the self-generation power plant to be constructed is determined according to an electric quantity balancing analysis result; 2) a wiring schemeincluding three main transformers and three segments of buses is used, two main transformers operate, one main transformer is in a standby state, and basic electricity charge is collected according tothe total capacity of two main transformers; 3) the main transformation capacity of the transformer station is calculated in the N-1 operation mode, and the standby capacitor provided by a power gridsystem is obtained; 4) N-1 verification is carried out on the wiring scheme of the transformer station; and 5) an investment economic effect of the transformer station wring scheme is analyzed in a total own cost method. Thus, the cost of the standby capacity can be omitted, the system standby capacity can be reduced, and a win-win target is realized for a power enterprise and a self-generation power plant enterprise.

The invention discloses an on-load capacity-regulating voltage-regulating transformer comprising an oil tank, an iron core, an on-load capacity-regulating voltage-regulating switch and a winding coil;the oil tank is a corrugated oil tank; the iron core is an amorphous alloy iron core; the winding coil is a three-phase three-winding coil which consists of a low-voltage serial-parallel connection layer, a low-voltage serial connection basic layer and a high voltage layer; the low-voltage serial-parallel connection layer, the low-voltage serial connection basic layer and the high voltage layer are sequentially concentrically sleeved on the amorphous alloy iron core; the on-load capacity-regulating voltage-regulating switch is arranged above the amorphous alloy iron core; a high voltage sleeve, a low voltage sleeve and a zero-phase sleeve are arranged on the corrugated oil tank; the high voltage layer is connected with the high voltage sleeve via the on-load capacity-regulating voltage-regulating switch; the low-voltage serial-parallel connection layer and the low-voltage serial connection basic layer are connected with the low voltage sleeve via the on-load capacity-regulating voltage-regulating switch; the low-voltage serial-parallel connection layer is also connected with the zero-phase sleeve; the three-phase three-winding coil, the amorphous alloy iron core and the on-load capacity-regulating voltage-regulating switch are all placed in the corrugated oil tank.

The invention discloses a regional power grid double-main-transformer economic operation control method and system. The method comprises the following steps: respectively acquiring rated parameters and historical real-time operation data of two main transformers in a certain region; screening the obtained historical real-time operation data to obtain to-be-fitted data, respectively calculating actual losses of the two main transformers during single-row operation and parallel operation according to the to-be-fitted data and rated parameters, and fitting actual loss curves of the two main transformers during single-row operation and parallel operation; according to the three actual loss curves, calculating intersection points among the three actual loss curves, and obtaining economic operation points; calculating a fluctuation interval according to the economic operation points and the actual losses; and obtaining a real-time switching strategy of the transformer according to the fluctuation interval, and performing economic operation control on the two main transformers according to the real-time switching strategy for obtaining real-time load power of the operating transformer in real time. The frequent switching condition of the transformer is reduced according to the fluctuation interval, and healthy use of the transformer is facilitated.

The invention relates to a contact method in double-looped network nodes of a 10-kV circuit. The contact method comprises the following steps of (1) determining a wiring mode to form a double-looped network, wherein the double-looped network structure is a looped network formed by two circuits respectively from two substations, looped network circuits are lay in parallel, each looped network circuit adopts a copper cable to connect, the copper cables are connected by a looped network cabinet, and two looped networks are formed by connecting nine looped network cabinets in series; and (2) determining a contact node, wherein the contact node comprises an opened annular contact point and a substation contact point, the opened annular contact point serves as a contact point of two circuits in an unified looped network circuit and is arranged at the middle position of the looped network and selected in the same looped network cabinet, and the substation contact point serves as contact between outgoing lines of the same substation and is selected at the middle position of each circuit. According to the method disclosed by the invention, the maximum allowable value of the load rate of the original circuit is improved to 56% from 50%, the average transfer of a load is facilitated, and the power grid is ensured to still run reliably after load transferring.

The invention provides a coordination control method for a coal-fired cogeneration unit under a self-adaptive BTU. The method comprises the following steps of acquiring standard coal quantities under different generating capacities; regularly detecting and optimally outputting the coal quality correction coefficient BTU through the logical configuration of a decentralized control system; and correcting the differential feedforward of the main steam pressure deviation, the proportion feedforward of an unit load instruction and the proportionality coefficient of a boiler master control through the coal quality correction coefficient BTU, correcting a fuel master control, and correcting the adjustment output of a secondary air door of the boiler. According to the coordination control method for the coal-fired cogeneration unit under the self-adaptive BTU, the stability of main controlled parameters of the unit is greatly improved, coordinated control and automatic power generation control indexes of the unit can be guaranteed, meanwhile, wind and coal parameter changes are smoother during load change, the adjustment variation of main parameters of the unit is further reduced, and the economical efficiency of the unit is higher; the influence of internal and external disturbance on coordination control and automatic power generation control adjustment is reduced, and the safe and economic operation level of the unit is improved.

The invention provides an electric vehicle and constant temperature cold storage in-place cooperation absorption distributed generating optimization method; the method comprises the following steps: calculating a cold storage grid connected period and an electric vehicle charge and discharge time quantum and number according to a multi-intelligent agent distributed electric vehicle cold storage optimization flow; employing a mathematics modeling to optimize a in-place cooperation absorption distributed generating system, using monitoring acquisition units to obtain real time distributed generating power data, and parting modules of the electric vehicle and the constant temperature cold storage. The method can maximumly absorb solar energy and wind power while ensuring the power grid normal operation and protecting environment, thus ensuring the power grid economical operations, providing high social economic benefits, and promoting wind power and solar energy generating technology applications.

The invention relates to the field of distribution network automation equipment, in particular to distribution network automation terminal equipment based on a low-voltage power distribution cabinet.The distribution network automation terminal equipment mainly comprises a cloud management system and the low-voltage power distribution cabinet; the cloud management system and the low-voltage powerdistribution cabinet are mutually connected and connected through a network, a high-performance chip is arranged in the low-voltage power distribution cabinet; the high-performance chip is divided into a communication module, an encryption module and an edge calculation module, and the low-voltage power distribution cabinet is connected with an energy utilization terminal through the high-performance chip. The low-voltage power distribution cabinet is used as the power support of the distribution network automation terminal, and meanwhile, the high-performance chip is arranged in the low-voltage power distribution cabinet, so that the automation service of the user terminal can be remotely assisted, the reliability of power supply is improved, the electric energy quality is improved, the energy-saving loss is reduced, the operation is optimized, the economic operation level of the system is improved, and the modern management level of the distribution network is improved.