31results about How to "Reduce wind curtailment rate" patented technology

The invention discloses a control method for controlling participation of energy storage in wind power frequency modulation based on rules. The method based on rules quantitatively gives output powerrequired by wind power generator set rotor control, pitch control and energy storage control when frequency of an electric power system changes, cooperatively controls wind power generator set rotor speed, pitch angle and energy storage charge-discharge power, compensates for the defects of existing simple qualitative description of power distribution between a wind power plant and energy storageby utilizing technical and economic complementarity of rotor control, pitch control and energy storage control, and improves and perfects frequency response capability of the wind power plant with high technical economy to realize capability of the wind power plant in participation in system frequency modulation under full wind conditions, thereby improving frequency stability of the electric power system under high wind power and high permeability, reducing energy storage capacity requirements, reducing wind abandoning rate of the wind power plant, increasing auxiliary frequency modulation service value, reducing set wearing, prolonging service life of the set and improving overall operation economic benefits of the wind power plant.

The invention provides a hydrogen production capacity optimization and configuration method for wind power absorption and wind curtailment through a hydrogen production system. The method is characterized in that the structure and operation characteristics of the wind power hydrogen production system are analyzed, and accordingly the hydrogen production capacity optimization and configuration method for wind power absorption and wind curtailment through the hydrogen production system is disclosed. By analyzing and calculating the wind curtailment level of a wind power plant, a wind power wind curtailment duration curve is formed, a wind power annual wind curtailment power statistic model is built through the interval estimation method, the maximum economic benefit serves as the target, the optimal capacity configuration interval of the hydrogen production system is determined by means of the interval optimization theory, and a multi-attribute decision-making model is built so that the optimal electrolytic cell configuration scheme of the hydrogen production system is determined. According to the method, by means of the hydrogen production system with the optical capacity, wind power adsorption and wind curtailment are conducted through the hydrogen production system, and considerable social benefits are higher on the basis of realization of wind power plant benefits.

The invention provides an external passage-based method for determining optimal peak-regulation installation scale of wind power. The method comprises the following steps of estimating building and running cost of a power transmission line, a wind power plant, a thermal power plant and a water pumping energy storage station according to a given ultrahigh-voltage power transmission line; giving outassembly proportion relation (maximum power) of four facilities under an initial state, supplying power to a load curve, and building an optimization model by taking minimum power utilization cost ofa terminal unit as a target; changing the proportion relation of the four facilities to obtain optimization results under different proportion relates, selecting the result with lowest terminal powercost from all optimization results, obtaining the installation scale (namely optimal peak-regulation installation scale of the wine power) of the wind power plant, the thermal power plant and the water pumping energy storage station according to a corresponding matching scheme. By building the optimization model and determining the optimal proportion of wind thermal storage and transmission, thepower utilization cost of the terminal is lowest on the premise that wind power is enabled to be utilized very well, and the wind abandon rate and the wind power terminal cost can be substantially reduced.

The invention discloses a multi-wind-field bidding method for electric heating and promoting wind electricity consumption on spot, belonging to the electric power system technology field. Targeting a minimum electric consumption cost of a thermal storage type electric boiler system, the multi-wind-field bidding method uses wind curtailment power prediction data and a quotation chart which are provided by a wind field according a thermal load requirement of the heat storage electric boiler system, adopts a particle swarm to perform optimization and realizes the minimum electric consumption cost of the thermal storage electric boiler system under a multi-wind filed bidding mode. The multi-wind-field bidding method for electric heating and promoting wind electricity consumption on spot can promote the consumption of wind curtailment electric quantity, improves electricity selling incomes, benefits the wind electricity consumption on spot, can improve a utilization rate of power transmission properties of a power grid company in off-peak hours and effectively reduces electricity buying cost of the thermal storage electric boiler. As a result, the multi-wind-field bidding method for electric heating and promoting wind electricity consumption on spot can effectively promote popularization and application of electric heating in heat supplying northern regions of China in winter.

The invention discloses an alternating current and direct current hybrid microgrid networking system applicable to large power wind/photoelectricity absorption. The alternating current and direct current hybrid microgrid networking system comprises at least one wind power plant, at least one photoelectric power station, at least one large-capacity power transformation system, at least one DC/DC converter, a first alternating current bus, a first direct current bus, a wind power delivery wire, a photoelectric delivery wire, at least two microgird units and a system-level dispatching center. Thefirst alternating current bus is connected into the wind power plant through the large-capacity electric transformation system, and then electric energy is transmitted to all microgrid units throughthe wind power delivery wire; the first direct current bus is connected into the photoelectric power station through the DC/DC converter, and the electric energy is transmitted to all the microgrid units through the photoelectric delivery wire. By means of the alternating current and direct current hybrid microgrid networking system, multiple microgrid units which have a poor new energy absorbingcapability can be networked, a multilayer control structure is adopted, wind/light complementation is fully utilized, support is provided for absorption of the large-capacity wind power, the capacity-expansion requirement of an electric vehicle for a power grid is met, various renewable energy sources can also be utilized to the greatest extent, the influence of new energy absorption on a large power grid is lowered, and the system reliability and stability are improved.

The invention discloses a method for determining minimum safety flow of a turbine low-pressure cylinder. The method includes: combining the static strength index and the dynamic strength index; determining the minimum safety flow of the turbine low-pressure cylinder; establishing a numerical model, analyzing a final-stage blade flow field under a small-flow working condition, analyzing final-stageblade stress and strain under the small-flow working condition, determining the minimum safety flow of the low-pressure cylinder under a static strength condition, performing modal analysis on the final-stage blade under the small-flow working condition, combining dynamic strength and static strength to determine the minimum safety flow of the low-pressure cylinder under a deep peak regulation working condition, and the like. The minimum safety flow of the low-pressure cylinder under the working condition of deep peak regulation can be rapidly and accurately determined, the problem that the minimum safety flow is not accurately determined from the flow field level or the structure side face is solved, safe and stable operation of a unit is guaranteed, the potential of deep peak regulationof the unit can be fully exerted, the wind abandoning rate is reduced, and more new energy can be generated in a grid-connected mode.

The invention discloses a combined heat and power scheduling method for improving the secondary consumption capacity of wind power, which comprises the following steps of: 1, determining a secondary wind power consumption mode, and defining a start-stop control strategy of a heat accumulating type electric boiler; 2, according to inequality constraints which should be met in the peak shaving participation process of the wind turbine generator and the thermoelectric unit, defining a feasibility coefficient to determine a unit power generation right price; 3, determining an objective function and constraint conditions in the combined heat and power dispatching model under peak load regulation right transfer; and 4, carrying out optimization solution on the combined heat and power dispatchingmodel by adopting a dynamic inertia weight and a particle swarm algorithm to achieve combined heat and power dispatching. The scheduling strategy provided by the invention can effectively reduce theintermittency and fluctuation of wind power, improve the wind power consumption and increase the benefit of an electrical comprehensive energy system.

The invention provides a risk reduction scheduling method for an electricity-gas interconnected energy system under the condition of fan failure, which is used for solving the problem of high risk forthe safe operation of the electricity-gas interconnected energy system due to the failure of a wind turbine generator set caused by faults of a power grid and the generator set in the prior art. Themethod comprises the steps of establishing a fan failure risk indicator of the electricity-gas interconnected system considering P2G based on the operation characteristics of the electricity-gas interconnected system and the fan failure risk; fully considering the constraint of an electric power system and the constraint of a natural gas system, establishing a multi-objective optimization model with the minimum risk of fan failure and the minimum coal consumption cost of a coal-fired unit so as to solve the contradiction between the risk and the coal consumption cost in the operation process of the system, thereby realizing risk reduction scheduling of the electricity-gas interconnected energy system, and improving the wind power consumption capability of the electricity-gas interconnectedsystem.

The invention discloses a micro-grid networking system applicable to high-power wind power absorption. The micro-grid networking system applicable to high-power wind power absorption comprises a micro-grid networking system, at least one wind power plant, at least one high-capacity power conversion system, an AC bus I and a special wind power transmission line, wherein the micro-grid networking system comprises at least two micro-grid units and a system-level dispatching center; the wind power plant is connected with the AC bus I by virtue of the high-capacity power conversion system; the AC bus I is connected with the special wind power transmission line; the special wind power transmission line is connected with the micro-grid units included in the micro-grid networking system; and the system-level dispatching center is connected with each micro-grid unit. According to the micro-grid networking system disclosed by the invention, the problems that the high-power wind power is difficultly absorbed, a charging load of an electric automobile has high requirements on distribution network capacity and generating capacity and the like are solved.

The invention belongs to the field of power dispatching, and particularly relates to a coal-electricity internal heat circulation system and a method for improving the wind power consumption level thereof. The constraint relation of a coal-electricityunit boiler combustion system, a high-temperature and low-temperature heat storage system and a steam power generation system is considered, a mathematical model of a steam extraction and double-heat-storage system is established, and a maximum wind power consumption optimization scheduling system is constructed. Through example simulation, the economy and the wind curtailment rate before and after steam extraction and double-heat-storage transformation are analyzed, and the influence effects of different wind power installations and heat storage capacities are compared and analyzed.

In order to overcome defects in the prior art, the invention provides a multi-time-scale wind storage combined system optimization scheduling method, which optimizes the income of a wind storage combined system on the basis of considering the blockage of a power grid channel, thereby greatly reducing the wind curtailment rate, improving the income of a wind power plant, and ensuring the safe and stable operation of a power grid. A coordinated scheduling model comprehensively considering the power grid side scheduling instruction requirement and the wind storage combined system side power generation plan is established, so that the friendliness of the wind storage combined system connected to the power grid is improved, and the wind abandoning level is reduced while the economical efficiency is improved; according to the method, the two-stage optimization scheduling model of the wind storage combined system considering safe and stable operation of the power grid forms linear programmingand mixed integer linear programming problems, and the problems can be efficiently solved by mature commercial software; the method can be widely applied to the field of energy economy calculation.

The invention belongs to the technical field of electric power systems, and particularly relates to a centralized heat supply pipe network modeling method suitable for electricity and heat combined dispatching. The method comprises the following steps: establishing a centralized heating pipe network model; constructing an electricity and heat combined dispatching model; and obtaining a solving result according to the constructed electric heating joint scheduling model. According to the invention, electric heating energy advantage complementation is utilized to realize operation decoupling, an electric heating combined dispatching model considering pipe network thermal characteristics is constructed, influence factors such as system electric heating load, system peak load regulation capability and wind power uncertainty are comprehensively considered; on the premise of considering the operation cost and wind power consumption benefits, the optimal operation curve of each type of unit is solved, and the wind power integration space is improved. The invention can promote the utilization of comprehensive energy such as electric heating, expand the absorption way of clean energy, improve the comprehensive utilization efficiency of energy, reduce the wind curtailment rate in the heat supply period in winter and reduce the burnup cost of a unit, and has important significance under the background of large-scale concentrated grid connection of wind power.

The invention relates to an echelon utilization energy storage system capacity configuration method for reducing wind curtailment, and the method comprises the steps: building an echelon utilization energy storage system full-life cycle cost estimation method through combining a secondary utilization process of a decommissioned power battery; under the condition that a power battery is used as an energy storage element in an echelon mode, wind power consumption income, operation benefits and environmental benefits are comprehensively considered, energy storage power constraint, energy storage capacity constraint, power balance constraint, wind curtailment power constraint and generator set output constraint are used as constraint conditions, and a capacity configuration model of the echelon utilization battery energy storage system is constructed; and according to the actual wind power data, analyzing and configuring the wind power acceptance capability of the echelon utilization energy storage system, obtaining an optimal configuration scheme of the echelon utilization energy storage system, and performing economic evaluation on the optimal configuration scheme. According to the method, the wind curtailment rate can be reduced, and operation benefits are increased. And when the initial SOC of the energy storage system is relatively low, the wind curtailment rate can be reduced.

The invention discloses a thermoelectric type compressed air energy storage system and method adopting a thermoelectric unit for steam extraction and heat storage, and the system is formed by introducing an electric heating module and a steam heating module on the basis of adiabatic compressed air energy storage. The system is coupled with a combined heat and power unit and a wind turbine unit, thermoelectric decoupling of the combined heat and power unit can be achieved, wind power fluctuation can be effectively stabilized, and energy grade matching can be carried out on the macroscopic level to improve efficiency. The method has important scientific significance and practical value in the aspects of novel power system construction, dual-carbon target realization and the like.