197results about How to "Improve peak shaving performance" patented technology

The invention provides a combined heat and power optimization method and system for promoting wind power consumption. The method comprises the steps that heat demand values of heat supply areas are predicted, and pipe network heat losses of heat network connection areas are obtained; according to the heat demand values and the pipe network heat losses, a thermoelectric coupling model of a thermoelectric cogeneration unit is established, a power generation scheduling model is established according to output power prediction values of a thermal power generating unit and a wind power plant; according to the thermoelectric coupling model, the power generation scheduling model, thermal equipment, power load and heat load, a combined heat and power optimization model is established; according to the combined heat and power optimization model, heat supply plans of the thermoelectric cogeneration unit and the thermal equipment and power generation plans of the thermal power generating unit and the wind power plant are determined. Compared with the prior art, the combined heat and power optimization method and system for promoting wind power consumption weakens a power grid dispatching mode of ordering power by heat, improves the peak load regulation capacity of a power grid, further effectively consumes wind power and decreases waste wind power quantity.

The invention discloses a thermoelectricity combined supply type compressed air energy storage system and a thermoelectricity combined supply type compressed air energy storage method for a back pressure type thermoelectric unit. The system comprises the back pressure type thermoelectricity cogeneration unit and a heat insulation compressed air energy storage system. During the electricity consumption valley time period at night, a compressed air energy storage device is used for storing redundant electric energy by compression, and heat generated in an air compression process is supplied to the thermoelectricity cogeneration unit through a heat exchange device; during the electricity consumption peak time period in the day, compressed air is expanded to generate power and absorbs the redundant heat generated by the thermoelectricity cogeneration unit. According to the system and the method, the electric energy is stored by the compressed air, and the heat-to-electricity ratio of the back pressure type thermoelectric unit can be regulated in the air compression and release processes, so that the peak load regulation capacity of the thermoelectricity cogeneration unit is improved; compared with the existing single-electric-energy storage system, the system disclosed by the invention has the advantage that under the same energy storage capacity, the system can provide a larger wind-power consumption space.

The invention relates to a sending end power grid power source structure planning method considering local load peak regulation capacity. A power source structure planning model is established in combination with various actual constraint conditions such as peak regulation constraints on the basis of considering wind and light storage peak regulation capacity and local load peak regulation capacity. The method comprises the following steps: establishing a power source structure planning model considering local load peak regulation capacity; obtaining a unit maintenance plan, considering to addthe power and local load peak regulation capacity of an energy storage wind power plant and a solar power station, and carrying out random production simulation of wind, solar energy, water, fire andpumping storage power generation; and obtaining hybrid particle swarm optimization to solve the power source structure planning model, and thus obtaining an optimal power source structure planning scheme. Compared with the prior art, the method has the advantages that users and electric automobiles are considered to serve as local load to participate electric power system peak regulation actively, the difference between peak and valley of the system can be reduced effectively and the difficulty of electric power system peak regulation is relieved.

The invention discloses an integrated power generation system for compressed air energy storage and combined cycle. The integrated power generation system comprises a compressed air energy storage system, an air turbine power generation system, a gas turbine power generation system, a steam turbine power generation system and a heat storage device and a cold storage device, wherein the compressed air energy storage system is formed by sequentially connecting a motor, an air compressor and a large air storage chamber; the large air storage chamber supplies compressed air to the air turbine power generation system and the gas turbine power generation system; the heat storage device is used for absorbing the exhausted air sensible heat of the air compressor, and heating water supplied by the steam turbine power generation system through a water supply heat exchanger; and the cold storage device is used for acquiring cooling quantity from the low-temperature exhausted air of an air turbine, and performing heat exchange with a condenser of the steam turbine power generation system. The compressed air energy storage system is organically combined with a gas-steam combined cycle power generation system, heat energy in air compression and expansion links is optimally utilized, and the heat economy of the power generation system and the peak shaving performance of a power grid are improved.

The invention relates to a thermodynamic system for improving heat supply unit electric output adjusting capacity. The thermodynamic system is characterized in that main steam or reheating section steam is subject to temperature and pressure reduction to directly serve as heat source steam for industrial heat users; an absorption heat pump 23 of a first-stage heat exchange device serves as a heatsource of a first-stage heat exchange station 25 in the heating period to supply heat to heat users 29 and supplies cold to the users in the non-heat supply period; a high-pressure electric boiler 24of a second-stage heat exchange device improves the boiler water feeding temperature, reduces heat absorbed by boiler fed water in an economizer 4, accordingly improves the boiler tail smoke discharging temperature, and guarantees normal running of an SCR denitration device 5; and according to a three-stage heat exchange device, exhaust steam of a turbine intermediate pressure cylinder 8 serves asheat source steam of a third-stage heat exchange station 27, the unit heat load is guaranteed, and the heat using requirement of the heat users 29 is met. The electric output adjusting capacity of the heat supply unit can be improved, it is guaranteed that the unit heat supply capacity is not decreased under the low load running working conditions, pyroelectric decoupling is achieved, and the electric output adjusting capacity of the heat supply unit is improved.

The invention discloses a source-load-storage coordinated scheduling method for improving new energy consumption. The method comprises the steps of S1, aggregating a thermal power plant, a new energypower plant, user loads and energy storage equipment into a source-load-storage scheduling system, and obtaining a new energy output curve, a heat utilization load curve and a power utilization load curve of the system; S2, establishing a source-load-storage coordinated scheduling model with the objective of maximizing new energy consumption quantity and minimizing the system operation cost; and S3, solving the source-load-storage coordinated scheduling model through utilization of improved multi-objective particle swarm optimization, and carrying out computing to obtain the source-load-storage coordinated scheduling method. The method has the advantages of simple realization method and flexible application. Schedulable resources such as power equipment, the user loads and the energy storage equipment in the system can be utilized rationally. The new energy consumption is facilitated, and moreover, operation cost of the system is reduced.

The invention discloses a heating-power system joint economic scheduling method by using heating network energy storage features. Influences of heating network energy storage on a thermoelectric unitare analyzed; constraints when the heating network keeps safe and stable operation after the thermoelectric unit changes a heating supply extraction flow are determined; according to specific reasonsfor wind curtailment generation by a power system containing a high proportion of thermoelectric units, a heating-power system two-stage scheduling policy considering the heating network energy storage is made; the system safety risk cost caused by wind power uncertainty is calculated; and a heating-power system joint economic scheduling model in consideration of heating network heat storage and wind power uncertainty cost and with the minimum wind curtailment amount as a target is built; and a fast particle swarm optimization algorithm is adopted to solve the model. The method of the invention can improve the peaking capability of the thermoelectric unit, the two-stage thermoelectric unit scheduling policy is adopted according to the specific wind curtailment reasons of the system in theheating supply stage, and system wind curtailment is thus reduced; and during the thermoelectric unit scheduling process, the wind power uncertainty is quantified as the risk cost and is added to a scheduling objective function, and the system operation cost and the risk can be coordinated.

The invention discloses a steam extraction and heat supply system capable of flexibly cutting off a low-pressure cylinder and a control method. According to the system, an auxiliary vacuumizing system is additionally arranged on an original unit vacuumizing system, the vacuumizing capacity of an original vacuum pump is effectively improved, and ultra-low back-pressure safe and stable operation of a unit is achieved; a low-pressure cylinder steam inlet bypass pipeline system is additionally arranged on a middle-low pressure communication pipe of an original steam extraction and heat supply unit, wherein the low-pressure cylinder steam inlet bypass pipeline system is composed of a low-pressure cylinder steam inlet cooler, a minimum cooling steam direct-through pipeline, a cooling steam small-flow adjusting pipeline and a cooling steam large-flow adjusting pipeline, and flexible transformation of the steam extraction and heat supply unit is achieved; and besides, a control system capable of operating flexibly and safely according to the different heat supply quantities and the electric load conditions of the unit is designed.

The invention discloses a peak-load regulation resource call decision-making method suitable for large-scale renewable energy grid connection, and the method comprises the following steps: obtaining a time sequence load demand PL in a specific time period in a specific region, and determining a peak-load regulation demand At of a power dispatching mechanism; determining the time sequence prediction output PW of a wind turbine generator set and the time sequence prediction output PS of a solar generator set; determining usable peak-load regulation resources Mi in a system, determining the adjustable measurement range of each type of peak-load regulation resources Mi, the peak-load regulation capacities DMi, and the corresponding peak-load regulation costs CMi, and constructing a mixed integral optimization model; and obtaining a peak-load regulation resource call sequence optimized in the specific time period. Through the construction of an economic model and a cost model of each peak-load regulation means, the method achieves the construction of the mixed integral optimization model which takes the economical efficiency as the target. Through model solving, the method obtains the peak-load regulation resource call quantity and sequence with the optimal cost effectiveness, enables a power system to adapt to the efficient consumption of renewable resources, improves the peak-load regulation capability of the power grid, and is better in practical guide significance and application value.

The invention relates to a method for optimizing a transmitting end grid power supply structure in consideration of channel constraints, comprising the following steps of acquiring unit data, load related data and price information data; establishing a power supply structure optimization model in consideration of channel constraints; obtaining a unit overhaul plan, and in consideration of adding an energy storage wind farm, the output of a solar power plant, a local peak load regulation capacity and a key section transmission capacity, performing random production simulation of wind, solar, water, fire and pumped storage power generation; and solving the power supply structure optimization model by using a hybrid particle swarm optimization algorithm to obtain an optimal power supply structure optimization solution. Compared with the prior art, the method considers the transmission capacity constraint of the key section, ensures that the newly-introduced unit does not limit the outputdue to insufficient section transmission capacity, and ensures the economical efficiency and rationality of a planning scheme.

The invention discloses an energy storage equipment optimization control method and system considering the negative peak regulation capacity of a wind power grid-connected system. The method comprisessteps of obtaining load prediction data and a distribution rule of wind power in day-ahead scheduling prediction, and determining an extreme scene with the maximum peak regulation demand of a systemload fluctuation section; in a load valley period, considering the maximum output level of energy storage equipment according to the load prediction data and the minimum output level of a unit, ensuring that the system can consume the maximum wind power, and constructing an optimization model for analyzing the peak load regulation capacity of the wind power grid-connected system under the participation of energy storage; carrying out linearization processing of the constructed optimization model for analyzing the peak load regulation capacity of the wind power grid-connected system under the participation of energy storage; and acquiring actual operation data of the system in the period, inputting the optimization model for analyzing the peak load regulation capacity of the wind power grid-connected system under the participation of energy storage, and determining a downward peak load regulation limit of the wind power grid-connected system under participation of energy storage in theoff-peak period.

The invention discloses an ultra-low-load operation system and an operation method for coal-fired generating units. The system is composed of two coal-fired generating units which operate in a unifiedmode, and each coal-fired generating unit consists of a steam turbine, a steam system, a vacuum air exhaust system, a condensed water system and a water feeding system; the steam systems of the generating units are connected through a heat steam connecting tube; and the water feeding systems of the generating units are connected through a water feeding connecting tube. The ultra-low-load operation system concentrates steam outlet force when the two units operate under ultra-low load on a main boiler, and solves the problems that boiler consumption is unstable, a coal mill, a fan and a denitrification reactor are unstable and the like when current coal-fired generating unit operates under the ultra-low load, and greatly improves safety and reliability of boiler operation control.

The invention discloses an energy-saving type heat storage and supply system which comprises a boiler, a middle-high pressure cylinder, a low pressure cylinder, a condenser, a turbine heat pump, a heat-supply network heater, a cooling tower, a circulation water pump, a heat-supply network water pump, a heat storage water tank, a steam input pipe, a heat-supply network heater condensed water outlet, a heat-supply network water return pipe, a heat-supply network water supply pipe, a heat storage water inlet pipe, a heat storage water outlet pipe, a first valve and a second valve. The boiler is connected with the middle-high pressure cylinder, the middle-high pressure cylinder is connected with the low pressure cylinder, an outlet of the low pressure cylinder is connected with a dead steam inlet of the condenser, a cooling water outlet of the cooling tower is connected with a water inlet of the contender, a water outlet of the condenser is connected with a cooling water inlet of the cooling tower, an inlet of the circulation water pump is connected to a pipeline between the water outlet of the condenser and the cooling water inlet of the cooling tower, an outlet of the circulation water pump is connected with a first heat source inlet of the turbine heat pump, and a first heat source outlet of the turbine heat pump is connected to a pipeline between the cooling water outlet of the cooling tower and the water inlet of the condenser.

The invention discloses a coordinated operation optimization method for a comprehensive energy system containing a heat pump, and the method comprises the following steps: building a daily load prediction model of the comprehensive energy system based on a nonlinear regression analysis method and a neural network prediction theory according to weather and season historical data and cold, heat andelectric load historical data; analyzing the influence of weather factors, seasonal factors and hot water load on the energy efficiency of the heat pump unit, and establishing an operation characteristic mathematical model of the heat pump under different working conditions; inputting actual weather and season information to obtain a daily load prediction result, and determining a matched heat pump operation characteristic model according to the weather and season information and the hot water load prediction result; and constructing an operation optimization model taking the minimum operationcost of the comprehensive energy system as a target, and carrying out optimization solution on the target function to obtain an optimized operation scheme of the comprehensive energy system. The influence of various factors on the actual energy efficiency of the heat pump is fully considered, the source side heat pump and other devices can be coordinated, and optimal operation of the comprehensive energy system is achieved.

The invention discloses an optimal scheduling method considering wind power-heat storage unit-electric boiler combined operation. The method comprises the steps of 1, establishing a wind power unit model, a thermal power unit model, a combined heat and power generation unit model, a heat storage unit model and an electric boiler model; 2, taking minimum system comprehensive cost as a target, constructing a wind power-heat storage unit-electric boiler combined operation optimization model, and configuring capacities of the heat storage unit and an electric boiler; 3, considering system constraints, unit constraints, heat storage and electric boiler constraints, predicting error cost constraints and environmental penalty cost constraints, and carrying out output configuration of each deviceof the system by taking lowest total cost of system operation as the target; and 4, when wind curtailment exists, enhancing the output of the heat storage and the electric boiler; and during valley wind, reducing heat storage and the output of the electric boiler, and increasing a wind power consumption capacity. In the method, the environmental penalty cost is added into the model, and a description method of thermal power and thermoelectric unit operation cost is improved so that a scheduling model is closer to an actual situation.

The invention discloses a source network coordination peak shaving method giving consideration to DC outwards-transmitted power regulating characteristics, and belongs to the technical field of grid new energy peak shaving. The method comprises the steps: determining an equivalent load change curve of a system according to the current wind power output and load prediction value of the system; establishing a peak shaving model in different peak shaving modes; formulating an adjustment plan of the conventional energy output and the DC outwards-transmitted power under different peak shaving modes; correcting a daily operation plan of the system, and obtaining a system peak shaving operation plan. The method provided by the invention can fully explore the peak shaving potential of the system,achieves the planning of the outwards-transmitted power of the system and the conventional energy output, and provides an idea for the solving of a wind power consumption constraint problem.

The invention relates to a method for evaluating the peak shaving capacity of a heat supply unit after heat supply transformation through a low-temperature waste heat pump. The minimum peak regulationoutput and the maximum peak regulation output of the unit in the heat supply state after the low-temperature waste heat pump heat supply transformation are adopted are determined according to the characteristic curve under the minimum steam exhaust amount of the actual operation low-pressure cylinder and the characteristic curve under each heat supply steam extraction flow by integrating the minimum steam exhaust amount of the actual operation low-pressure cylinder and the total heat supply steam extraction flow of the heat supply unit. The method is simple, convenient, accurate and reliable,and important reference data can be provided for a power grid dispatching department to determine the operation modes of the existing heat supply unit adopting the low-temperature waste heat pump forheat supply transformation in different stages of the heating period.

The invention discloses a power-heat decoupling system in a heat-power cogeneration system. The power-heat decoupling system comprises a gas generator, a heat-power set, a wind power generation device, a heat storage device, a power-heat conversion device, a power load and a heat load, wherein the gas generator is connected with the power load; the wind power generation device and the heat-power set are connected with the heat storage device through the power-heat conversion device; the heat-power set is connected to the power load, the heat load and the heat storage device respectively; the heat storage device is connected to the heat load. A method comprises the following steps: determining demanded quantity of the heat load and the power load, the purchased wind power unit price, fuel unit price, power selling price and heat selling price; determining power quantity and heat quantity generated by unit fuel and heat generated by unit power quantity through power-heat conversion; solving power of the heat-power set, the heat storage device and the gas generator, interaction power of the wind power generation device and the heat storage device, and interaction power of the heat-power set and the heat storage device; and regulating the heat load and the power load via the heat storage device and the gas generator if the heat load and the power load have fluctuation. Through the power-heat decoupling system, an operation method of ordering power by heat is decoupled; and the problem of the wind power consumption is solved.

The invention discloses a sliding parameter shutdown method for a gas-steam combined cycle unit. The sliding parameter shutdown method comprises the following steps that S1, auxiliary steam is switched into the gas-steam combined cycle unit for medium pressure steam supply; S2, the load of the gas-steam combined cycle unit is reduced to 150 MW, and the opening degree of a high-pressure attemperation water regulating valve and a reheating attemperation water regulating valve is controlled, so that the temperature of high-pressure main steam and the temperature of reheated steam range from 540 DEG C to 545 DEG C; S3, the load of the gas-steam combined cycle unit is reduced to 140 MW, and a medium-pressure steam combining valve and a low-pressure steam inlet valve are closed manually. The method has the advantages that the sliding parameter shutdown method is utilized, the metal temperature of a steam turbine (2) is reduced to 371 DEG C from 530 DEG C at the normal shutdown moment, the time of shutting down a jigger is shortened to four days from the normal shutdown time of seven days, and the benefits of the gas-steam combined cycle unit are greatly improved.

The invention discloses a peak regulating control system of wide area wind power in an electric power system, which comprises a system architecture of the peak regulating control system of wide area wind power unified in the whole network based on wide area measurement system (WAMS), a control signal selection of the peak regulating control system of wide area wind power, a control strategy of the peak regulating control system of wide area wind power and a controlling communication interfacing technology of the peak regulating control system of wide area wind power. The method belongs to the technical field of electric power system wide area control; a technical proposal of the invention can be used for solving the difficult problem that the electric system lacks the peak regulating control system of wide area wind power unified in the whole network; the constructed system is used as a new method of peak regulation when the peak regulating capacity of hydroelectric generating units and thermal power generating units is exhausted, can increase the peak regulating ability of grid and promote the security and stability level of the power grid.

Disclosed are a power grid peak-load regulation control system and method considering summer air-conditioning load difference characteristics. Supply side electric power is jointly supplied by a purecondensing type thermal power generating unit and a photovoltaic power generation array; each user adopts an air-conditioning power consumption mode to supply cooling; on the basis of historical detection, energy supply and energy consumption conditions in a certain time of the further can be predicted; next, on the basis, dispatching is performed, so that the power generation output of the pure condensing type thermal power generating unit can be reduced, and joint compensation between a user refrigerating load and the photovoltaic power generation array can be realized; therefore, relative to the fluctuation properly of photovoltaic power generation, the user air-conditioning power utilization load also can be adjusted (by adjusting the user refrigerating load, consumption of the photovoltaic power generation can be promoted and power grid load pressure in the electric power peak time frame also can be lowered); and in addition, in energy compensation regulation, user self differences (different users can accept different temperature change amplitudes, and after different users close air conditioners, the indoor temperature rise rates are also different, so that the user air condition switch-off time frames are different under the premise of satisfying cooling supply comfort degree of different users) are also taken into consideration, so that effective regulation of the whole system is realized.

The invention provides a power grid peak regulation system and method based on load side intelligent charging pile cluster control. The system comprises a power grid side and a load side, wherein theload side is used for acquiring real-time state information of the charging pile cluster and application information of the intelligent charging terminal and uploading the information to the power grid side; the power grid side is used for determining the power of each charging pile in the economic charging mode according to the real-time state information of the charging pile cluster and the application information of the intelligent charging terminal, and then obtaining the peak-adjustable power of the charging pile cluster; and according to the adjustable peak power, adopting a grouped cyclic charging pile cluster calling sequence, distributing a circuit breaking quota according to a limited number or limited power form of each group, and issuing a distribution decision to a load side.Based on the system, the invention further provides a power grid peak regulation optimization method. According to the system, the potential of charging pile cluster charging on power grid peak regulation is deeply excavated. The power grid realizes load side peak regulation of the charging pile cluster through the charging pile cluster management system by comprehensively summarizing the whole network load of the power grid in a certain region.