42 results about "Peak load shaving" patented technology

The invention discloses an electric energy regulation device and method for electrified railways. The electric energy regulation device is in bridging connection between two power supply arms of a traction transformer. The electric energy regulation device comprises isolation transformers, single-phase back-to-back PWM converters, an energy conversion circuit, an energy storage element and a control unit. The control unit carries out calculation according to voltages, currents and directions of the power supply arms alpha and beta and completes control over the PWM converters and the energy conversion circuit. Consequently, energy conversion between the power supply arms alpha and beta and the energy conversion between the energy storage element and the power supply arm alpha or the power supply arm beta can be achieved. The electric energy regulation device is capable of fully recycling and utilizing braking feedback electric energy of a locomotive through transfer, storage and release of the electric energy, improves the energy utilization rate of a tractive power supply system, reduces the installation billing capacity of a traction transformer, can deal with the negative sequence, idle work and harmonic waves of a traction substation, avoids traction force losses and speed losses, caused by electric phase separation, of a train and can also have the effects of peak load shaving and voltage stabilization and can be used as an emergency power supply.

The invention discloses a coordination control method and system for rapid peak-load shaving of a thermal power generating unit. An improved DEB boiler load command is adopted in the coordination control system of the thermal power generating unit for ensuring that the main vapor pressure control deviation is low when the load of the thermal power generating unit is changed in the peak-load shaving, the boiler can be rapidly adaptive to the output of a steam engine when the load of the thermal power generating unit is changed; a calculation method for the set value of the main vapor pressure of the thermal power generating unit is provided in order to stagger forward overlaying of dynamic compensation parts of the boiler command when the load is changed rapidly, and prevent the changing rate of the boiler command from exceeding an acceptable range of the thermal power generating unit. By adopting the coordination control method, load control rapidness and stability of the running working condition of the thermal power generating unit can be improved extremely; an effective solution is provided for a power grid to improve on the load control rapidness and stability of the unit scheduling, meanwhile, a powerful support is provided for the improvement of the AGC and primary frequency modulation evaluation index of a power plant, so that the method and system have important significance for improving the admission performance of new energy sources.

The invention discloses a control method and device for orderly charging of electric vehicles. By acquiring charging demands of the electric vehicles, time-of-use electricity price is set according tothe charging demands and the system running state; and a user autonomously responds to the time-of-use price and determines a charging plan, the negative effect of large-scale electric vehicle charging on a power grid is eliminated, the effects of significantly reducing the operating cost of a charging station and the charging cost of an electric vehicle user is achieved, and the effect of charging load peak load shaving is effectively realized.

The invention discloses a modular design method of a large-capacity battery energy storage system which is defined into power MW level and comprises an energy storage battery, a battery management system, an energy storage converter, a monitoring system and the like. According to a modular design idea, the large-capacity battery energy storage system is reduced to an energy storage unit, an energy storage branch and an energy storage loop according to the hierarchy, wherein the energy storage unit is a basic module of an energy storage system and comprises an energy storage pile and an energy storage converter. According to the function division of the large-capacity energy storage system, the invention relates to specific applications under a peak load shaving mode, a new energy access mode and a peak-shaving frequency modulation mode, and comprises definition, composition, power/capacity design, topological structures, access modes and energy storage unit parameter design of all levels of structures in the energy storage system. The large-capacity battery energy storage system has the advantages of clear structure, well arrangement and favorability of operation and maintenance of a primary system and energy management and control of a secondary system, and the like.

The invention discloses a complex line full parallel AT traction power supply system and method based on comprehensive energy. The system comprises a complex line full parallel AT traction power supply system and a comprehensive energy system; a photovoltaic array, a wind generating set and a fuel cell are connected in parallel to a direct current bus, electric-hydrogen storage is added to supplement power vacancy and peak load shaving, comprehensive energy is accessed into a traction power supply system through a reasonable mode, the power and the state of each microsource are detected in real time, the energy optimization management by taking the lowest total generation cost as a target is achieved based on a particle swarm optimization. The complex line full parallel AT traction powersupply system and method based on comprehensive energy can ensure the safety and stability of the system and the high reliability of power supply; the traction energy consumption structure is optimized, and the new energy consumption level is improved; and the method meets the development direction of national energy conservation and emission reduction, and reduces the power supply requirement ofthe electrified railway on the power system to a certain extent.

The invention relates to a steam extraction and heating integrated system for electric peak-load shaving of a combined cycle unit and an operation method of the steam extraction and heating integratedsystem. The steam extraction and heating integrated system comprises a gas turbine unit and a steam turbine unit, integrated design of different steam extraction modes is carried out based on the principle of gradient energy utilization, and thus the thermoelectric decoupling operation capacity of the combined cycle unit is effectively improved, and heating requirements of residents are met; in addition, hot water heat storage systems are simultaneously coupled in a heating system and a boiler water feeding system, so that cooperative matching of electric peak-load shaving and heating of thecombined cycle unit is achieved, and the electric peak-load shaving capacity of the combined cycle unit during operation under a pure-condensation condition is improved. By means of the steam extraction and heating integrated system, loss of working capacity in the heating process is effectively lowered while outward heating capacity of the combined cycle unit is deeply exerted. Especially currentsevere electric peak-load shaving policy requirements are met, the deep peak-load shaving capacity of a thermal power generating unit is achieved, the requirement of a power grid for unit peak-load shaving is truly met, and high practical application value is achieved.

The invention discloses a load control method for realizing peak load shaving of a power distribution network. The method comprises the following steps of 1) obtaining a daily load curve according tothe actual operation conditions of a power grid; 2) for the obtained daily load curve, clustering the daily load curve through a fuzzy C-means clustering algorithm; separating a high energy consumption load curve and a heat storage load curve from the daily load curve; and 3) aiming at the high energy consumption load curve and the heat storage load curve in the step 2), transferring the high energy consumption load and the heat storage load to realize the load control of peak load shaving of the power distribution network. According to the present invention, (1) the problem solving mode is simple, and the engineering practical application is facilitated; and (2) by classifying the power loads, carrying out feature recognition on the high-energy-consumption loads and the heat storage loads, and carrying out controllable load transfer in the two loads, the peak load shaving of the power grid is realized; and (3) the power supply pressure of the power system in the second peak period iseffectively relieved, and meanwhile, a night power supply valley period load curve can be smoother.

The invention discloses a heat source tower heat pump air-conditioning system capable of using a cool storage device to assist heating. Please see the figure one to three in the specification for the system schematic diagram. The heat source tower heat pump air-conditioning system capable of using cool storage device to assist heating mainly comprises a refrigeration or heating device (1), a heat source tower (2), a cool storage tank (3), a heat source tower water pump (4), a circulating pump (5), an anti-freezing solution pump (6), a heat exchanger (7), a tail end device (8) and a user side water pump (9), wherein the cool storage tank (3) is filled with phase-change materials with the phase-transition temperature ranging from minus 6DEG C to 7DEG C, switching and adjustment are carried out through valves. In summer, valley electricity is used for cool storage at night, and independent cooling of the cool storage tank, independent cooling of a main machine and united cooling of the cool storage tank and the main machine can be achieved in the daytime; in winter, a cool storage device is used in cooperation, the valley electricity is used for heat storage at night, independent heating of the cool storage tank, independent heating of a heat source tower heat pump and united heating of the cool storage tank and the heat source tower heat pump can be achieved in the daytime. According to the heat source tower heat pump air-conditioning system capable of using cool storage device to assist heating, the problem that a cool storage device of a traditional cool storage air conditioner is idle in winter is solved, the problem that high energy consumption is caused by the low COP of a unit in winter is solved, and the capacity of peak load shaving of the cool storage device is improved.

The invention provides an interactive injection-production method of a gas well of a gas storage. The method comprises the following steps that a stratum pressure model is established according to thereal-time radius of a gas reservoir in the gas storage; a well bottom flowing pressure model is established according to the effective permeability and a skin factor of the gas reservoir of the gas storage; and a gas production model for the gas storage is determined according to the stratum pressure model and the well bottom flowing pressure model. The gas production model is obtained via the method, and used to implement gas production on the gas well, peak load shaving can be realized for the gas well timely. Gas supply of the gas well is more reliable and safer, and the gas production cost can be effectively reduced via the method.

The invention belongs to the technical field of power grids and particularly relates to a method for minimizing a peak-valley difference by coordinating an electric heat storage load with battery energy storage, and the power grids can minimize the peak-valley difference by coordinated operation of the electric heat storage load and the battery energy storage. The method includes the following steps: performing data acquisition; performing prediction calculation on a household load during a peak period; calculating influence of electricity price A on an added electric storage heat load at a valley moment; calculating charging and discharging coefficients of the battery energy storage; calculating charging and discharging time of a storage battery; and performing calculation on the method for minimizing the peak-valley difference according to the influence factors and period and valley moments. The method can alleviate the peak load regulating pressure of a unit, and can relieve outputof a heat power unit at the peak moment, so that the peak load regulating pressure of the heat power unit is reduced. A corresponding electricity price can be made from difference of electricity consumption in different periods, peak load shaving can be performed by combination of the storage battery, and the peak-valley difference is minimized.

The invention relates to a combined cycle device for steam extraction integration and heat storage peak-load shaving coupling and an operation method of the combined cycle device. The combined cycle device comprises a gas turbine unit and a steam turbine unit; the gas turbine unit comprises a gas turbine air compressor, a gas turbine combustion chamber, a gas turbine body and a first generator, and the steam turbine unit comprises a waste heat boiler, a steam turbine high-pressure cylinder, a steam turbine low-pressure cylinder, a second generator, a steam condenser, a condensate water pump, agland heater, a deaerator, a first temperature and pressure reducing device, a second temperature and pressure reducing device, a steam heat accumulator, working equipment, power equipment, a heaterfor heating a network, a dewatering heat exchanger and a circular pump of a heat supply network. Based on the principle of gradient energy utilization and combined with a steam surplus energy utilization mode, integrated design of different steam extraction modes is carried out, and the thermoelectric decoupling operation capacity of a 6FA type combined cycle unit is effectively improved; the steam heat accumulator is utilized to improve the peak-load shaving and frequency modulation capacity of the combined cycle unit, and meanwhile, the outward heating capacity of the combined cycle unit under all conditions is guaranteed.

The invention relates to a heat supply system of a thermal power plant, in particular to a peak load shaving integrated heating system and method. The peak load shaving integrated heating system comprises a power generating system and a heat supply network, wherein the power generating system is used for converting heat energy into electric energy and delivering part of residual heat energy to theheat supply network through a pipeline; the heat supply network comprises a circulating pipeline; a heat exchanger, a heat accumulation system, a first-stage user side and a second-stage heat supplysystem are arranged on the circulating pipeline of the heat supply network; the heat supply network exchanges heat with the residual heat energy of the power generating system through the heat exchanger; the heat accumulation system is in parallel connection with a water supply pipeline of the heat supply network and is used for storing heat energy during heat supply valley and releasing heat energy during heat supply peak; the second-stage heat supply system is in parallel connection with the circulating pipeline of the heat supply network; the second-stage user side is arranged on the second-stage heat supply system; and the second-stage heat supply system is used for supplying heat energy in the circulating pipeline of the heat supply network to the second-stage user side. The peak loadshaving integrated heating system solves the problems of peak load shaving, valley filling, and uneven cold and hot at the far and near ends of the heat supply system under the situations that a heating area is increased rapidly, and the heat supply requirement is strong.

The invention discloses a variable-frequency power saver of a single-phase injection molding machine, belonging to the technical field of motor energy-saving control. The variable-frequency power saver comprises an injection molding machine operating parameter detection circuit (10), a single-phase rectification circuit (20), a charging circuit (30), a battery (40), a battery switch (50), a single-phase inverter (6), a capacitor (70), a control circuit (80) and a single-phase power contactor (90). When applied to an injection molding machine with an AC motor, the variable-frequency power saver can respectively realize two energy saving methods of speed regulation energy saving and power grid peak load shaving simultaneously, and the effect of saving 20-90% of power can be generally achieved. The variable-frequency power saver of the single-phase injection molding machine has the advantages of simple and convenient structure, visual metering, obvious power saving effect and broad application prospect in the energy saving aspect of the injection molding machine.

The invention belongs to the technical field of load extraction, and particularly relates to an air conditioner load extraction method. The main purpose of the invention is to formulate a certain measurement standard when extracting load data of power users in a power grid system, and extract load data generated by air conditioner equipment from the overall load data according to the definition ofa model; and then the influence degree of the air conditioner load on the overall load is determined, then an actual method is formulated to control the change of the load (by adjusting the air conditioner temperature, controlling the electric charge and the like), and finally a certain influence is generated on the overall load, so that the effect of peak load shaving is achieved.

The invention relates to a climate compensation method based on an energy storage type heat pump system. The climate compensation method comprises the following steps that 1), meteorological information is collected through a meteorological forecast data collector, and the meteorological information is input into a building load calculation module; 2), meteorological data is input into a buildingload model by the building load calculation module to obtain building predicted load capacity; 3), whether energy supply is needed or not is judged according to the building predicted load capacity; 4), an energy storage calculating and monitoring module obtains the energy storage demand quantity; 5), whether energy storage is needed or not is judged; 6) energy is stored; and 7), whether the energy storage requirement is met or not is judged by the energy storage calculating and monitoring module until the energy storage requirement is met. According to the climate compensation method based onthe energy storage type heat pump system, the building load demand is calculated in advance on the basis of weather forecast data and the building load model, energy is stored in advance according tothe load demand by means of the energy storage type heat pump system, energy consumption waste can be reduced according to the climate compensation principle, loads of heating, ventilating and air conditioning can be transferred, and peak load shaving is achieved.

The invention relates to a ground-coupled heat pump and electric thermal storage water tank combination system and belongs to the technical field of heating ventilation air conditioning in the new energy field. The system comprises a water source heat pump unit, a tail end side circulating water pump, a ground side circulating water pump, an electric thermal storage water tank and two temperature control electric regulation valves, wherein a hot water inlet of a water source heat pump unit condenser is connected with an outlet of the tail end side circulating water pump, a cold water outlet of the water source heat pump unit condenser is connected with a water supply pipeline of the ground side, and a cold water inlet of the water source heat pump unit condenser is connected with an outlet of the ground side circulating water pump; an inlet of the ground side circulating water pump is connected with an outlet of the electric thermal storage water tank, the inlet of the ground side circulating water pump is also connected with the second electric regulation valve, an inlet of the electric thermal storage water tank is connected with a water return pipeline of the ground side through the first electric regulation valve, and an inlet of the first electric regulation valve is also connected with the second electric regulation valve. By the adoption of the system, peak load shaving can be achieved, operation expenses can be reduced, and electric capacity increase is reduced.

The invention discloses a sewage (wastewater) water source heat pump and valley electricity energy storage type district heating system. A sewage (wastewater) gravity pipeline is connected with a sewage (wastewater) regulating reservoir; a sewage (wastewater) automatic water taking device is connected with a sewage (wastewater) outlet pipe; the sewage (wastewater) outlet pipe is connected with a blocking prevention sewage heat exchanger; one side of the blocking prevention sewage heat exchanger is connected with an intermediate water pipe; an intermediate water circulating pump is arranged on the intermediate water pipe; the intermediate water pipe is also connected with a temperature increasing device; one side of the temperature increasing device is connected with a system water pipe; a valley electricity energy storage device and a heating system water circulating pump are arranged on the system water pipe; and the system water pipe is connected with heating users. The sewage (wastewater) water source heat pump and valley electricity energy storage type district heating system disclosed by the invention has the beneficial effects that three operations modes of independent heating of the heat pump, independent heating of the valley electricity energy storage device and combined heating of the heat pump and the valley electricity energy storage device can be realized by opening and closing a waterway switching valve, and peak load shaving of power resources is realized.

The invention discloses a power stabilizing method for a micro-grid system grid-connected node, and relates to the technical field of power control of the micro-grid system grid-connected nodes. According to the method, a functional module framework is built, a computer system is controlled by a computer program command, and the computer program command is stored in a readable storage medium of a computer. The method mainly includes a low-frequency stabilizing step, a medium-frequency stabilizing step and a power adjusting step. Power fluctuation of the grid-connected node is stabilized through a PI adjuster by a low-frequency stabilizing algorithm to obtain low-frequency adjusting overall power Pd, and a peak load shaving function is achieved. In the medium-frequency stabilizing step, medium-frequency adjusting overall power Pz is obtained by an improved secondary frequency modulation algorithm, the frequency of executing the medium-frequency stabilizing step is higher than that of executing the low-frequency stabilizing step, and the power of each inverter is adjusted according to the Pd and the Pz in the power adjusting step, so that power fluctuation of the grid-connected node is stabilized.

The invention relates to a combined heating and refrigerating system and a control method thereof. The system comprises a sewage source heat pump unit, a heat storage type electric boiler, a heating unit, a fan coil and a network monitoring control unit. The sewage source heat pump unit is connected with the heating unit, the fan coil and the network monitoring control unit. The heat storage typeelectric boiler is connected with the heating unit and the network monitoring control unit. By means of the technical scheme, peak load shaving and efficient heating and refrigerating are achieved, the energy utilization efficiency and the renewable energy utilization rate are improved, and the electric power supply tension is relieved.

The invention provides a matrix management type solid temperature partitioned energy storage method and device. The matrix management type solid temperature partitioned energy storage method comprisesan energy storage mode and a power supply mode, wherein under the energy storage mode, a low-temperature working medium is subjected to equal-pressure heat absorption through a first module group ofa solid heat storage matrix, then, is insulated and compressed by a compressor, is subjected to an equal-pressure heat release process through a second module group, enters a turbine to be subjected to thermal insulation and expand to work externally, and returns to the first module group for being recycled; and under the power supply mode, the difference is that the working medium is subjected toequal-pressure heat absorption through the second module group, and is subjected to equal-pressure heat release through the first module group. The matrix management type solid temperature partitioned energy storage method and device solve the wind and light abandoning problem in photovoltaic power generation and wind power generation as well as the peak load shaving problem of peak-valley electricity, simultaneously conduct heating during energy storage and power supply, recycle waste heat of waste gas in another heat storage system, and improve heat-work conversion efficiency.