251results about How to "Reduce the number of starts and stops" patented technology

The invention provides an air conditioner control method and system based on a PID algorithm. The air supply temperature, the air returning temperature and humidity of an air conditioner in a machine room are collected; according to the air supply temperature, the air returning temperature and the preset machine room temperature, the starting frequency and the starting time of a compressor in the air conditioner are controlled; the incremental PID algorithm is utilized, and according to the temperature difference value between the air supply temperature and the air returning temperature and the preset machine room temperature, the optimal output frequency of the compressor is calculated; meanwhile, according to the optimal output frequency of the compressor, the optimal rotating speed of a draught fan is adjusted; the compressor is controlled to carry out cold amount output at the optimal output frequency, and the draught fan is controlled to rotate at the adjusted rotating speed. According to the method and system, a frequency converter adjusts the rotating speed of the compressor, the air conditioner outputs the smaller cold amount, balance of the cold amount and the heat amount in the machine room is achieved, the starting and stopping frequency of the compressor is reduced, the running energy consumption of the compressor is reduced, and therefore the air conditioner runs in a more energy-saving manner.

The invention discloses a vacuum assisted brake system, a control method thereof, and a vehicle comprising the vacuum assisted brake system. The vacuum assisted brake system comprises a vacuum booster, a vacuum pump, a vacuum container and a master controller ECU, wherein the vacuum pump is communicated with a vacuum servo air chamber of the vacuum booster by the vacuum container; and the master controller ECU is electrically connected with the vacuum pump. The vacuum assisted brake system also comprises an engine; an intake manifold of the engine is communicated with the vacuum servo air chamber of the vacuum booster; and the master controller ECU makes the engine serve as a main vacuum source and the vacuum pump serve as an auxiliary vacuum source by controlling the opening and closing of the engine and the vacuum pump so as to provide a vacuum environment for the vacuum booster. By using the engine as the main vacuum source, the vacuum assisted brake system of the invention reducesthe operating time and starting/stopping time of the vacuum pump, and avoids frequent opening and long time operation of the vacuum pump, thereby prolonging the service time of the vacuum pump.

This is a method to prevent the indoor coil-pipe's temperature over lower, and its air conditioner. In the CPU of monotype set, install a temperature test block of the coil-pipe. Use the light-coupled silicon controlled method, according to the temperature of test value to control the alternating voltage of outdoor set, then to realize control the rotating speed of blower in the outdoor set. This invention provide a new electric-control method for fixed-frequency air conditioner, it can dynamic control the rotating speed of outdoor set's blower, to adjust the exchange efficient of this system in certain time interval.

The invention relates to a non-disturbance switching water pump control method comprising the following steps of: selecting different control manners of a water pump motor according to operation requirements of a water pump system; using a long-distance control manner of the water pump motor when a water pump normally works, so that a PLC (Programmable Logic Controller) performs monitoring and on-off control on a motor state automatically or according to set technological parameters; when the water pump has a fault and needs to maintain or carry out field emergency enablement, selecting an in-position control manner of the water pump motor which is operated to a field operation box; and realizing non-disturbance switching between the two modes when the motor continuously works through delay relays which are respectively arranged at each mode state in a mutual switching process. In a condition of not changing any technical requirement of the water pump system, the non-disturbance switching water pump control method provided by the invention can be used for not only realizing a control manner of mutually switching between a concentrated manner and a local manner of the water pump motor without being switched off, but also carrying out on-off operation on the field operation box and an HMI (Human-Machine Interface), so that the security reliability and operation convenience of the water pump system can be improved.

When in the 1 operation the temperature inside is maintained at target temperature by an evaporator, the cooling power of the evaporator is increased so as to carry out the 2 operation for temperature inside lowering. When in the 2 operation the temperature inside reaches lower limit temperature (Tmin), the compressor stops so as to carry out the 3 operation. When in the 3 operation the temperature inside reaches upper limit temperature (Tmax), the compressor restarts so as to carry out the 1 operation.

The invention relates to the field of compressor control methods, and in particular relates to a start-stop control method for double air compressor of a locomotive. The method comprises the following steps: connecting an air pressure regulator to a first main air cylinder; connecting the air pressure regulator to a locomotive microcomputer; and utilizing the air pressure regulator and a control system arranged in the locomotive microcomputer to corporately control the start-stop of the air compressors. When a locomotive main air cylinder is free from pressure,two air compressors are simultaneously started to work; after the pressure in the main air cylinder reaches a preset pressure, one of the air compressors is stopped and the other air compressor continues to work till the pressure in the main air cylinder meets demand, so as to prolong the working time of the air compressors, reduce the start-stop times of the air compressors and cause the interior of the air compressors to achieve a temperature at which water can be vaporized.

The invention discloses a bidirectional dynamic coordination control method for an oversaturated trunk road. The bidirectional dynamic coordination control method comprises the steps of determining ideal phase difference according to the running properties of queued vehicle stream and arrived vehicle stream, determining the green time for meeting the traffic demands and avoiding the intersection congestion, determining queued vehicle weight impact factors by different control strategies, and taking maximal release amount as a target for realizing coordination control of the trunk road in a first direction; based on the coordination control in the single direction, calculating and coordinating the phase difference, the green time and the release amount at the intersection of the trunk road in another direction for different status combinations in three statuses of green lamp loss, intersection congestion and new traffic stream compensation at the intersection in the other direction of the trunk road; and in combination with coordination control algorithms in two directions, realizing the bidirectional dynamic coordination control of the oversaturated trunk road. The bidirectional dynamic coordination control method for the oversaturated trunk road is suitable for traffic oversaturated trunk roads in big cities, and is capable of effectively reducing the queuing length and the delay time at the intersection on the trunk road, improving the overall passing capability of the trunk road and avoiding the spread of traffic congestion.

The invention relates to the technical field of sample temperature impact test instruments, in particular to a high-low temperature impact test box which comprises a high temperature box body, a low temperature box body, an electrical cabinet, an electrical system, a refrigeration system and a heating system, wherein the heating system is arranged inside the high temperature box body, the refrigeration system is arranged inside the low temperature box body, and both the heating system and the refrigeration system are in wired connection with the electrical system. The high-low temperature impact test box is characterized in that a high temperature slot air-conditioning system is arranged inside the high temperature box body, a low-temperature slot circulating system is arranged inside the low-temperature box body, both the high temperature slot air-conditioning system and the low-temperature slot circulating system are in wired connection with the electrical system, and basket transmission systems capable of moving up and down are arranged inside the high temperature box body and the low-temperature box body respectively. According to the invention, since the upper and lower boxes adopt different media, the high-temperature box adopts air, and the low-temperature box adopts water, the specific volume of water is very large, and during impacting, a test piece is enabled to reach a low temperature instantaneously. Therefore, the testing is enabled to be rigorous and the testing requirements of special material can be met.

The invention relates to a two-stage optimization scheduling method supporting source network load storage multivariate ubiquitous coordination. The method comprises the following steps: 1, a day-ahead stage: predicting next-day data according to historical data and a load uncertainty model considering demand side management; 2, taking low-carbon economy as a target, considering a deep peak regulation working condition and a normal operation working condition of the thermal power generating unit, carrying out random sampling by utilizing a Monte Carlo method, and solving a day-ahead low-carboneconomy scheduling model by utilizing a hybrid bat algorithm to obtain a low-carbon economy scheduling model; 3, in the intra-day stage, according to the ultra-short-term prediction values of the wind power plant and the photovoltaic power station and the intra-day system load considering the day-ahead price demand response, based on an intra-day thermal power generating unit correction model andan intra-day low-carbon economic dispatching model, determining the unit start-stop combination and the price and price type demand response quantity of each time period; and solving and adjusting the day-ahead scheduling plan by using a hybrid bat algorithm. The low-carbon economic dispatching of the power system is realized, the local optimum in a high-dimensional condition is effectively avoided, and the global optimal solution is quickly obtained.

The invention discloses an active power distribution method of a battery energy storage power station. SOC (state of charge) values and active power of battery units are acquired in real time, the battery units of the energy storage power station are classified, and charging and discharging ranges of each class of the battery units are calculated; according to the charging and discharging ranges of each class of the battery units, the charging and discharging regulating capacity of the battery units is calculated, and finally, distribution of the active power is performed on each battery unit according to the regulating capacity of the battery units. Thus, the energy storage power station responds to scheduling of a power grid through control on charging and discharging of the battery units, and the acceptable capacity of the power grid for intermittent renewable energy source power generation is increased; secondly, the battery units are classified according to real-time SOCs of the battery units, startup and shutdown times of the battery units can be reduced, the utilization rate of resources of the battery energy storage power station is increased, and service lives of the battery units are prolonged.

The invention discloses a wind-solar-battery integrated scheduling strategy. By using the method, a utilization rate of intermittent energy and an effect of peak-load shifting can be increased and realized; a thermal power generating unit start and stop frequency can be reduced; starting up and shutdown cost and rotation standby cost are reduced; and phenomena of wind abandoning and light abandoning are effectively prevented. The technical scheme is characterized in that the method aims at a problem brought by individual wind and power access network, wind, power and photovoltaic are considered into one body, and integrated output is achieved, and then pumped storage is combined so as to carry out combined scheduling; modeling is performed so as to introduce a multi-target function of maximum wind-solar-battery energy output and a minimum generalized load fluctuation; in thermal power economic cost, set start and stop cost is considered; and an improved particle swarm algorithm is used to solve a generalized load fluctuation curve and set scheduling output. In the invention, flexible pumped storage energy or a scheduling power supply is used to restrain wind power and photovoltaic output fluctuations; a problem that there is no photovoltaic output at night so that a wind-power reverse peak adjusting characteristic is high is solved; possibilities of the wind abandoning and light abandoning are reduced; smooth wind-solar output is achieved and the peak-load shifting is realized; set starting up and shutdown frequencies are reduced; and economic benefits of the system are increased and power grid reliability is guaranteed.

The invention discloses a wind power plant active scheduling method based on an improved multi-agent consistency algorithm, and belongs to the technical field of the wind power plant active scheduling. For the characteristics of numerous wind power plant unit and complex operation conditions, the method is improved on the basis of the traditional variable proportion distribution algorithm, and proposes an active scheduling method of fan dynamic grouping, and the multi-agent consistency algorithm is applied to the distributed scheduling method of the wind power plant active scheduling, and thedefect of the centralized scheduling is avoided; in the end, the traditional multi-agent consistency algorithm is improved, and a virtual consistency scheduling method in segmented updating is proposed for the fan grouping scheduling policy, the active scheduling on the fan in the wind power plant is realized, the active scheduling of the fan in the wind power plant under different conditions canbe effectively realized, the fan regulation margin is sufficiently utilized, and the action frequency of a control system is reduced; the scheduling cost is lowered, the difficulty of the updating algorithm is further lowered, and the feasibility of the engineering practice is enhanced.

The invention discloses a new energy power generation-containing cross-regional power grid unit combination decentralized coordination optimization strategy. The method comprises steps of based on thetarget cascade technology, taking a boundary node voltage phase angle value influencing the power of the interconnection line between the interconnected power grids as an inter-region coordination variable; the problem of circulation between regions is avoided; an upper layer coordinator is formed for coordinating and optimizing voltage phase angles of boundary nodes of all the areas, a lower layer is optimized for parallel solving of SCUC problems of all the areas, convergence is judged through alternate iteration solving of the upper layer coordinator optimization problem and the lower layer coordinator optimization problem, and if all the areas converge at any time, iteration is finished, and an optimal solution is obtained; In this way, coordinated optimization of the unit starting and stopping plan, the standby plan and the tie line transmission power in the area is achieved. According to the strategy provided by the invention, power grid resources can be reasonably controlled and economically dispatched, the actual requirements of network security and line power flow are met, 'source-network-load' coordination and resource sharing among regions can be realized, and the operation economy and reliability of the power grid are effectively improved.

The invention provides a crossing method and device for an overspeed failure of a wind generating set. The method comprises the following steps: acquiring the current wind regime data; judging whetherthe current wind regime is overproof gust or not according the current wind regime data; if not, judging whether the current rotating speed of the wind generating set is greater than or equal to a preset crossing rotating speed or not and judging whether the current variable pitch rate of the wind generating set is greater than or equal to a preset crossing variable pitch rate or not; if the current rotating speed is greater than or equal to the preset crossing rotating speed and the current variable pitch rate is greater than or equal to the preset crossing variable pitch rate, increasing the cut-out rotating speed within a second preset time period and controlling the wind generating set to carry out a variable pitch operation continuously; reducing the cut-out rotating speed in a second preset time period, and judging whether the current rotating speed of the wind generating set is greater than or equal to the cut-out rotating speed or not; and if the current rotating speed of thewind generating set is smaller than the cut-out rotating speed, controlling the wind generating set to operate according to the current state.

The invention discloses a cascaded automatic generation control method for a hydropower station group and belongs to the technical field of hydraulic and electric engineering. The automatic generation control method comprises the following steps: selecting hydropower stations and carrying out classification and topological relation treatment on the hydropower stations; setting related initial conditions; determining a vibration zone of the hydropower stations and output correction modes; decomposing a cascaded real-time load to obtain a basic load (EDC) component and an adjusting load (ACE) component, and judging whether a cascaded EDC model is invoked or not according to real-time information deviation; constructing the cascaded EDC model to distribute the EDC component; constructing a narrow-sense cascaded AGC model to distribute the AGE component; and obtaining real-time set outputs of the cascaded hydropower stations. According to the method disclosed by the invention, the counter adjusting effect of a daily adjustment hydropower station is fully exerted to coordinate cascaded pitch peak and frequency modulation operation. The cascaded load EDC component and the ACE component are respectively distributed, so that the problem of massive load transfer is effectively avoided, and the economical benefit and the safety of the cascaded hydropower stations are ensured. Therefore, the engineering practicality of the method disclosed by the invention is further enhanced.

The invention discloses a peak clipping and valley filling optimization scheduling method for a distributed energy storage power station during photovoltaic grid connection. The optimization scheduling method comprises the following steps: 1, obtaining wind power plant group prediction information, distributed photovoltaic prediction information, load prediction information and distributed energystorage power station charge capacity information; 2, calculating a daily net load value, establishing a target function by taking the minimum daily net load variance as a target to optimize the charging and discharging power of the distributed energy storage power station, and forming a day-ahead charging and discharging plan of the distributed energy storage power station; and 3, based on the system economy and the wind power priority scheduling principle, bringing the day-ahead charging and discharging plan of the distributed energy storage power station into system power balance constraint, and establishing an objective function by taking the lowest system operation cost as a target to optimize the output of the wind power plant group and the output of the conventional unit so as to form output plans of the wind power plant group and the conventional unit. According to the invention, the net load peak-valley difference caused by distributed photovoltaic grid connection is reduced through the energy storage power station, and the power grid regulation capability is improved.

The invention relates to the field of dynamic balance of a rotator, in particular to a method for solving the double-faced dynamic balance of fan vibration. The method comprises the following steps of 1) measuring to obtain horizontal vibration values OA1 and OB1 corresponding to bearing bushes on two ends as well as corresponding phases; 2) respectively welding a test-added counterweight in the same position on two sides of the fan rotator, and measuring to obtain horizontal vibration values OA2 and OB2 corresponding to bearing bushes on two ends as well as corresponding phases; 3) drawing a vibration coordinate graph against a rotating direction of the fan; and 4) clockwise or counterclockwise revolving a vector AB at an angle alpha to offset a vector OB, and obtaining a revised weight and a revised phase by utilizing a formula. By the adoption of the method, the double-faced dynamic balance on the fan rotator is carried out, and the technical problems of repeatedly disassembling and assembling equipment, hardly eliminating vibration and the like caused by inappropriate revised counterweight angle and weight in the complex computing process of current dynamic balance are solved.

The invention provides an air conditioner control method and device, a storage medium and an air conditioner. The method comprises the steps that after the air conditioner is started, when it is detected that the indoor environment temperature meets a first preset condition, a compressor is controlled to be shut down, and the shut-down frequency is accumulated; after the compressor is controlled to stop, when it is detected that the indoor environment temperature meets a second preset condition, the compressor is controlled to be restarted for operation; and when the compressor is shut down for the Nth time, the target frequency of restarting operation after the compressor is shut down for the Nth time is determined according to the operation time from restarting after the compressor is shut down for the (N-1) th time to the operation time when the compressor is shut down for the Nth time. According to the scheme, the starting and be shut down frequency of the air conditioner can be reduced, and therefore fluctuation of the indoor temperature is reduced.

The invention discloses a train docking control method, device and medium. The method includes the following steps that the spacing between a main train and a docking train is obtained in real time, wherein the main train and the docking train drive in the same direction on the same main line, and the main train is the power train of the docking train; whether the spacing is smaller than or equalto a spacing threshold; if yes, a speed change rule is set, wherein the speed change rule refers to the positive correlation between the speed of the docking speed and the spacing; according to the speed change rule, the docking train is controlled to catch up with the main train to dock with the main train. It can be seen that the method can achieve the smooth docking between the two trains whenthe two trains are in drive, the overall transport efficiency is improved, energy consumption is reduced, and the operation cost of the train is reduced. In addition, the invention further discloses the train disengagement control device and medium, and the beneficial effects are as described above.

The invention discloses an electric vehicle charging station with an energy storage system. The charging station adopts a dual power supply mode so that power supply stability is increased. Through an electric energy adjusting effect of the energy storage system of the charging station, a starting-up and shut-down frequency of a conventional generator set and a rotation standby capacity in a power grid can be reduced so that a power grid load curve is stable as far as possible. A large load and a high time-of-use power price of the charging station in the power grid can be reduced, a high power price is avoided, charging station operation cost is reduced, reliability of charging power supply can be increased, and the charging station is ensured to provide the charging power supply for an electric vehicle continuously. Through a bidirectional converter, a condition that the charging station sells power to the power grid becomes possible, an electric energy instruction can be increased and a current fluctuation is reduced, and a power factor is well controlled.