100results about How to "Meet load demand" patented technology

The invention provides a heat accumulating type electric heating optimizing operation control method improving wind power absorption for solving the problems that a wind power heat supply operation manner is simple in our country, and the discarded wind power quantity cannot be flexibly and reasonably matched. The heat accumulating type electric heating optimizing operation control method improving wind power absorption is characterized by comprising the steps of the mechanism of improving wind power absorption through heat accumulating type electric heating, the evaluation index acquisition, operation of a heat accumulating type electric boiler, control analysis of the heat accumulating type electric boiler and the like. According to the operation control method, the requirement for loads of a user can be met, and more discarded wind power quantity can be absorbed; and the heat accumulating type electric heating optimizing operation control method has the advantages of being scientific and reasonable, high in adaptability, capable of fully utilizing energy more effectively, good in effect and the like.

The invention provides a distribution network reliability evaluation method considering light storage continuous load carrying capacity. The method specifically includes the steps of firstly, conducting a clustering analysis on photovoltaic output historical data; then, establishing a photovoltaic output time sequence model under different weather types; and finally, simulating the operating state of a distribution network considering the light storage continuous load carrying capacity through a Monte Carlo method and obtaining a reliability index of the distribution network. The invention is innovative in three aspects: first, taking into account the impact of the time sequence of photovoltaic output on the reliability of the distribution network under the different weather types; second, obtaining an island dynamic division strategy after the failure of the distribution network by calculating the light storage continuous load carrying capacity under a constant confidence level; and third, proposing the distribution network reliability evaluation method considering island operating characteristics.

The invention provides a fan tap position control method, a fan tap position control system and an air conditioner. The fan tap position control method comprises the following steps: judging a work mode of a multi-split air conditioner, wherein the work mode comprises a refrigeration mode and a heating mode; obtaining the energy level coefficients of a plurality of indoor fans so as to determine the load coefficient of an outdoor fan according to the energy level coefficients; obtaining a preset outdoor environment interval-initial tap position mapping table, wherein the preset outdoor environment interval-initial tap position mapping table comprises a mapping relationship between the threshold value interval of a preset outdoor environment temperature value and an initial tap position; judging the preset outdoor environment temperature interval to which the outdoor environment temperature detected in real time belongs to so as to determine the corresponding initial tap position; according to the work mode, the load coefficient and the initial tap position, determining the tap position of the outdoor fan. According to the technical scheme, the load balance of the air conditioner is realized, and power consumption is saved while the load requirements of the indoor fans are guaranteed.

The invention relates to a charge-discharge-storage integrated station control method based on improved V2G (vehicle-to-grid) and priority scheduling. The charge-discharge-storage integrated station includes a charge station, an electrical changing station and a cascade station. The charge-discharge-storage integrated station control method includes the steps: 1) respectively taking every electricvehicle entering the charge-discharge-storage integrated station and the energy storage battery in the cascade station as one group of independent battery energy storage system, and predicting the real-time load distribution of the charge-discharge-storage integrated station; 2) determining the discharge lower limit of each group of battery energy storage system; 3) determining the charge-discharge priority of each substation in the charge-discharge-storage integrated station; and 4) according to the real-time power grid scheduling command and the predicted real-time load distribution, takingthe discharge lower limit of each group of battery energy storage system as the constraint condition, and according to the charge-discharge priority, determining the charge-discharge state of the each group of battery energy storage system. Compared with the prior art, the charge-discharge-storage integrated station control method based on improved V2G and priority scheduling can effectively avoid reducing the charging experience of the user because of over discharge of the electric vehicle which takes part in V2G, receives excess discharging and receives power grid scheduling, and achieves win-win of the electric vehicle user and the power grid.

The invention provides an economic dispatching method of an electric-heating integrated energy system based on a double multiplier iterative algorithm. The process comprises the following steps: establishing an economic dispatching model of the electric-heating integrated energy system; The Lagrange multiplier method is used to solve the economic dispatching model of electric-heating integrated energy system, which is transformed into an optimal dispatching problem. A double multiplier iterative algorithm is designed to solve the above-mentioned optimal scheduling problem, and the optimal output of each unit under the constrained conditions is found, and the minimum total operating cost under the optimal scheduling of the electric-thermal integrated energy system is calculated. The economic dispatching model of the electric-heating comprehensive energy system of the invention firstly considers the network transmission loss and can realize the real-time calculation; Realized two kinds of electric heating energy coordinated optimization disposition; On the premise of considering the transmission loss of the network, it can meet the two kinds of load demands of the users and reduce the production capacity cost of the enterprise. The double multiplier iterative algorithm proposed by the invention can avoid directly solving the multi-dimensional implicit equations, reduce the complexity of model solution and have a fast convergence rate.

The invention provides an economical optimal dispatching method for electric-thermal integrated energy system considering transmission loss. The process comprises the following steps: establishing aneconomic optimal dispatching model of the electro-thermal integrated energy system; using the Lagrange function method to analyze the conversion optimization dispatching problem. An iterative algorithm is designed to solve the optimal dispatching problem and the optimal solution is obtained. The optimal value of the economic optimal dispatching model of the electro-thermal integrated energy system, that is, the minimum value of the total cost, is calculated. The invention considers the important influence of the transmission loss on the supply and demand balance of the system and the output optimization of the unit, and considers the electric power network, the thermal pipe network, the electric heating multi-energy coupling, the unit output restriction and the operation restriction many kinds of constraint conditions; on the premise of considering the transmission loss of network, the method can meet the demand of users and reduce the cost of production capacity, so as to improve theeconomic benefits and ensure the safe and stable operation of the system; the fast iterative algorithm is used to convert the quadratic constraint of the electric force equation into affine constraint, which reduces the complexity of the model and has a faster convergence rate.

The invention discloses a microgrid control method employing an integrated storage and distribution design. With energy storage arrays distributed in various microgrids as core control objects, active or reactive automatic balance control of connected microgrid groups is achieved. The microgrid control method comprises the specific steps as follows: in networked and grid-connected states, exchange power constant values are calculated through an energy management module and are distributed to various microgrid control modules; and the microgrid control modules can independently maintain balance of intranet power in an isolated grid state and can cooperate with the energy management module, so that constant value distribution of various distributed power generation units in the networked and grid-connected states is achieved. According to the microgrid control method, mutual aid of power is achieved through a low-voltage and medium-voltage two-stage distribution network between neighboring microgrids free of support of an extranet power supply; the microgrid operation reliability is improved; the microgrids can constantly carry out electromigration among a plurality of working conditions and automatically keep the balance of generated power and electric power; the electric energy quality is improved; the safe electricity utilization requirements are met; clean power generation resources of wind, light and the like are utilized to the maximal extent; and oil and electricity are utilized to the minimal extent, so that pollution to the environment is reduced.

The present invention discloses a generated power control system and control method for an intelligent micro-grid with a medium energy storage function. The control system mainly comprises: a wind-solar complementary power generation system, a photothermal generator set with the medium energy storage function, a micro-grid power control system, etc. The control method comprises: by a micro-grid power control center, receiving a power instruction transmitted from a micro-grid dispatching automation system in real time; collecting generated power of the wind-solar complementary power generation system in real time; and calculating a micro-grid optimal power allocation scheme by an energy management system. According to the power allocation scheme, by carrying out coordination control on heat storage of a heat storage system, a heat release rate, and the generated power of the photothermal generator set, stable output of the generated power of the micro-grid is achieved. According to the control method, technical defects of uncontrollability, discontinuity, large fluctuation adn the like of wind energy and solar generated power, which are caused by change of the external environment, can be overcome, the generated power of the micro-grid is stabilized, electric energy of new energy can be consumed to the greatest extent, and the problem of phenomena of ''wind curtailment'' and ''light curtailment'' in the new energy can be effectively solved.

The invention provides an engineering configuration method of independent wind-diesel-storage micro grid system capacity. The engineering configuration method includes the following steps: A, collecting local actual measurement loads and wind speed history data, and constructing a load and wind speed prediction curve of a whole life cycle according to a timing sequence mode; and B, performing preliminary model selection on a wind generation set, a diesel generation set and an energy storing device according to the curve obtained in the step A, and determining unit capacity and quantity limiting value of each distributed power source. The engineering configuration method of the independent wind-diesel-storage micro grid system capacity can accurately select configuration of the independent wind-diesel-storage micro grid system capacity, optimizes the capacity configuration, provides practical and effective scientific bases for planning and design of independent wind-diesel-storage micro grid system engineering, can reduce power supply cost of a system to the minimum on the premise of satisfying load requirements, and is simple in method and suitable for engineering calculation.

The invention provides a distribution transformer capacity control method and system. Power using users in a power grid are classified, annular maximum practical coefficients of various users within a collection year limit are respectively sampled and computed, a maximum practical coefficient tendency chart changing with the operation time of distribution transformers is drawn according to the data, the maximum practical coefficients of different distribution transformers within the year limit are looked up, and finally the capacity of each distribution transformer is controlled according to the maximum practical coefficients. In the whole process, man-made subjective participation is avoided, strict data acquisition and computation are adopted, and the result accuracy is ensured, namely accurate capacity control of the distribution transformers can be achieved. In addition, a maximum practical coefficient selecting principle is adopted to ensure that the load demand can be meet and high device utilization rate can be also obtained, and accordingly reasonable utilization of the power grid resources and safe running of the power grid are ensured.

The invention discloses a method of micro grid energy scheduling based on dynamic adaptive fuzzy logic. The method includes the steps of taking one-day prediction information of a micro grid as a training set for generating an optimal fuzzy controller; taking the obtained prediction information as an analog input, and with the dual optimization goal of minimizing the operation cost of the micro grid and minimizing the power fluctuation of a public grid, performing dynamic adaptive design on two aspects, including the shape of a membership function and a fuzzy inference rule, of a fuzzy interference system through a new heuristic optimization algorithm; and further using the obtained optimal fuzzy controller for real-time control of the micro-grid energy management. For one thing, the adaptive optimal controller considers the running information for a period of time and adjusts its own fuzzy inference system according to different environments so that the optimal scheduling of the global time can be realized; and for another, since the fuzzy logic inference has good fault tolerance towards its own imprecise information, the method can effectively avoid the interference of the uncertainty caused by a prediction error.

The invention discloses a capacity optimization method for a park-level integrated energy system based on investment constraints. The method comprises steps that S1, a load type required by a park isdetermined and recorded as a sold energy set, and various types of energy load demands are predicted; S2, a form of externally available energy is determined and recorded as a purchased energy form set; S3, corresponding energy production device and conversion device types are determined and recorded as a device type set; S4, relevant available energy storage devices are determined and listed intoan energy storage device set; S5, an alternative scheme combination set is formed according to a random initialization scheme; S6, a corresponding annualized device investment amount is calculated incombination with the alternative scheme combination set to form a reserved scheme set; S7, the reserved scheme set is screened by utilizing investment constraints to form a reserved scheme set; S8, the reserved scheme set is inputted into a multi-target collaborative optimization model; and S9, the TOPSIS method is utilized to solve an optimal configuration scheme.

The invention discloses an optimizing method for the power supply volume of a micro gas turbine adopting a microgrid under a grid-connected mode. The optimizing method comprises the following steps of: (1) classifying power supply modes: classifying the power supply mode of the microgrid under the grid-connected mode into four classes, namely power supply from a large power grid to the microgrid, regenerative distribution type power generation, non-regenerative distribution type power generation and interruptible load IL; (2) quantizing the power supply costs of various power supply modes; and (3) providing a mathematical model for optimizing the power supply volume of the micro gas turbine based on the cooperative optimal theory, wherein the mathematical model is established according to the target of minimizing the summation of the power supply costs from various power supply modes, thereby acquiring the power supply optimizing quantity P(g, t.0) of the micro gas turbine. Therefore, according to the optimizing method disclosed by the invention, on the premise of meeting the load requirement of the microgrid, the characteristic of economic mutual complement of various supply modes for the microgrid under the grid-connected mode is fully utilized, and the relationship among various power supply modes is comprehensively considered so as to improve the power supply economy of the microgrid under the mode and further realize the optimization for the power supply volume of the micro gas turbine.

The invention provides a multi-objective optimal dispatching method of a power system based on a two-layer consistency algorithm. The process comprises the following steps: establishing a multi-objective optimal dispatching model of the power system; searching for the best condition; designing a two-level consistency algorithm to find out the optimal output of the generator and calculating the minimum value of comprehensive expectation. The invention considers the influence of the transmission loss on the system supply-demand balance and the unit output optimization, and can realize the real-time calculation of the transmission loss. The multi-objective optimization problem is transformed into a single objective optimization problem by using linear weighted sum method. The supply side cansatisfy its own interests by adjusting the weighted coefficient according to the demand of the enterprise. The optimal configuration of electric energy is realized, and the supply side is guided to make a reasonable capacity plan. On the premise of considering the transmission loss, it can meet the user's load demand and improve the economic benefit and social environmental protection benefit of the enterprise. Low dependence on communication and effective protection of enterprise and user privacy, and can achieve plug and play group and effectively respond to network topology changes.

The invention discloses a high-step-down-ratio multi-end DC transformer with a fault ride-through capability. The DC transformer is composed of two converters and is suitable for the interconnection of medium-and-low-voltage DC systems. The front-stage converter is connected with a medium-voltage DC line, is formed by cascaded full-bridge submodules, and realizes step-down and DC fault ride-through functions. The rear-stage converter is composed of a plurality of modules connected in parallel. Each module is composed of a bridge circuit and a high-frequency transformer, and is connected with alow-voltage DC line to realize isolation and voltage stabilization functions to meet different load requirements. When a bipolar short-circuit fault occurs at the medium-voltage side of the DC transformer, a fault characteristic is detected, the front-stage converter of the DC transformer is quickly locked, the reverse voltage is supplied to the DC line, the fault current is quickly reduced to zero, and the DC transformer restores to normal operation after the fault is cleared. In the whole fault occurrence, detection, clearing and recovery process, there is no need to disconnect the DC lineby a DC breaker, which is beneficial to the rapid recovery of the system to complete the bipolar short-circuit fault ride-through and achieve the stable operation of the DC system.

The invention relates to a refrigerant with a low GWP value, which can substitute R22 and be directly filled to such systems as air-conditioners/ heat pumps, etc. The refrigerant comprises propylene and 2,3,3,3-tetrafluoropropene and is prepared by the method of physically mixing the components according to a corresponding proportion in a liquid phase state. The refrigerant provided in the invention completely meets requirements for environment-friendly substitution of R22 at home and abroad at present since the ODP value of the refrigerant is zero and the GWP value is very low; the pressure of the refrigerant is close to that of R22, compression ratio of the refrigerant is smaller than that of R22, exhaust temperature and unit refrigerating capacity of the refrigerant is superior to those of R22, and the properties of the refrigerant are beneficial for long-term operation of a compressor; application of the refrigerant provided in the invention needs no change to equipment or parts of existing R22 refrigerating air-conditioning systems, and the refrigerant is soluble in mineral oil and can be directly filled.

The invention discloses a unit sliding pressure control optimization method and system based on a thermoelectric load condition. The method comprises the steps of S1, establishing a conversion relation model for converting a unit thermal load into an electric load; S2, establishing a mapping model between the thermoelectric load and the main steam pressure optimization value; S3, performing main steam pressure real-time rolling optimization based on the mapping model in combination with actual operation parameters; and S4, outputting an optimization result to a unit control system to control the operation of the unit. According to the unit sliding pressure control optimization method and system based on the thermoelectric load condition, the heat supply amount is taken into consideration,sliding pressure operation strategies of multiple variables such as the thermoelectric load and main steam parameters are comprehensively considered, and thus real-time optimization is conducted.

The invention provides a refrigerant composition with low GWP (Global Warming Potential) value, and the refrigerant composition consists of fluoroethane(R161) and 2,3,3,3-tetrafluoropropene (HFO-1234yf). The preparation method of the refrigerant composition is as follows: physically mixing the components under liquid phase based on corresponding proportions. The refrigerant composition provided by the invention, which has zero ODP (Ozone Deplete Potential) value and quite low GWP value, can be applied to directly replacing R22 in a household air conditioners/heat pump systems and the like.

The invention relates to a distributed power source and micro grid hybrid power supply system, comprising a distribution network to which a distributed power source and a load are connected, and a micro grid connected with the distribution network. The distributed power source and the load are configured outside the micro grid and directly connected to the distribution network. A distributed power source, a load and stored energy in a micro grid constitute a micro grid, which is then connected to a grid. The wiring mode of the power supply system adapts to possible working conditions such as failure and overhaul in the running process, and the running mode can be transformed according to the working condition and is very flexible. While taking into consideration high reliability and other advantages of power supply based on a micro grid, constraints such as cost of investment and control difficulty are considered, and an appropriate micro grid scale is maintained.

The invention provides an optimized control method and system for an electric heat pump- combined heat and power system, relates to the technical field of energy operation. The method can take each unit as a different main body, and performs control by taking benefit maximization of each main body as a target, thereby meeting load requirements of combined heat and power users, and satisfying the each unit main body with the revenue to the maximum extent. The method comprises the following steps: S1, establishing a composition structure framework of the electric heat pump-combined heat and power system, and establishing an output model of each unit; S2, establishing a revenue function model of each unit in the electric heat pump-combined heat and power system; S3, establishing a non-cooperative gaming model of the electric heat pump-combined heat and power system; and S4, solving the gaming model by particle swarm optimization to obtain a combined heat and power scheduling optimizationscheme of each unit. The technical scheme provided by the invention is suitable for the control process of the electric heat pump-combined heat and power system.

The invention discloses a device and method for performing distributed energy utilization on molten salt stored energy and belongs to the technical field of photo-thermal power generation. The device comprises molten salt heat storage tanks and a steam generator, and the molten salt heat storage tanks are internally provided with electric heaters, drainage pipes and molten salt pumps; the steam generator is provided with a heat source inlet, a heat source outlet, a cooling water inlet and a stream outlet; the electric heaters are connected with electric signal processing equipment through wires; the drainage pipes are connected with the heat source outlet through first pipes, and the molten salt pumps are connected with the heat source inlet through second pipes; the cooling water inlet is connected with a water source through a third pipe; and the steam outlet is connected with a steam turbine, a steam converter, a heating heat supply network and a lithium bromide unit correspondingly through fourth pipes. By means of the device, renewable resources can be effectively utilized, the energy comprehensive utilization rate is high, the occupied area is small, the cost is low, emission of various pollutants is reduced, and good economic and social benefits are achieved.

The invention discloses a control method and system of a radiant air conditioner. The control method of the radiant air conditioner comprises the following steps that the environmental load information of the environment where at least one indoor unit connected with an outdoor unit is located is obtained; the water temperature of water needing to be supplied to each indoor unit is determined according to the environmental load information of the environment where the indoor unit is located; the highest water temperature of water needing to be supplied to at least one indoor unit is determinedas a first water supply temperature of a first water chilling unit; the lowest water temperature of water needing to be supplied to at least one indoor unit is determined as a second water supply temperature of a second water chilling unit; and a first water supply quantity of the first water chilling unit and a second water supply quantity of the second water chilling unit are controlled according to the dew-point temperature of the environment where each indoor unit is located, so that the air temperature of the environment where each indoor unit is located is made higher than the dew-pointtemperature of the environment where each indoor unit is located. The method capable of adjusting a water system of the air conditioner according to the load requirement of the air conditioner is provided, and thus, an efficient, low-energy-consumption and anti-condensation operation effect of the air conditioner is achieved.

The invention discloses a control method of a natural cooling refrigerating system. According to the technical scheme, the control method of the natural cooling refrigerating system is characterized by comprising an energy regulation control device, a natural cooling coil pipe, a heat exchanger, a water chilling unit and a chilled water solution; the energy regulation control device is any one, orany two or all of a linear three-way valve, a variable frequency water pump and a variable frequency draught fan; when the refrigerating system is in a running state, the conditions (1), (2) and (3)are set, and whether the natural cooling coil pipe is opened or not is determined according to the conditions; when the refrigerating system is in a shutdown state and the natural cooling coil pipe isin a closed state, the conditions (4), (5) and (6) are set, and whether the natural cooling coil pipe is opened or not is determined according to the conditions.

The invention discloses a rail transit refrigeration system and an intelligent adjustment method and device thereof. The method comprises the steps that a load demand in a field after a preset time period in future is estimated, and a deviation between the load demand after a preset time period and a load demand in a current moment field is determined; operating parameters of the refrigeration system is adjusted according to the deviation of the load demand; and according to the target temperature and the return air temperature, obtained after the operating parameters are adjusted, of the refrigeration system, the operating parameters are continuously adjusted to meet the load demand in the field after the preset time period. Therefore, when the flow rate of persons changes rapidly, the operating parameters of the refrigeration system can be adjusted in time according to the deviation of the load demands, and the purpose of improving the user comfort while ensuring energy efficiency isachieved. After the operating parameters are adjusted according to the deviation of the load demands, adjustment can be continuously carried out according to the return air temperature, the delay problem caused by the fact that the refrigeration system is far away from a user area can be solved, so that the adjustment is more accurate.