45results about How to "Reduce frequent startup" patented technology

The invention provides a cooperative control method and system of a battery energy storage power source participating in secondary frequency modulation of a power grid. The cooperative control method comprises the steps of: mounting the battery energy storage power source in a regional power grid needing the cooperation; obtaining an ACE (Area Control Error) signal from an electric grid control center by a cooperative control module; participating in the secondary frequency modulation of the power grid by the battery energy storage power source, and then dividing a typical application scene to determine the chance and participating degree of participation in the frequency modulation; converting a theoretical frequency modulation command into a practical frequency modulation command, then realizing charge/discharge control of the battery energy storage power source through an energy conversion system, and accordingly helping a traditional frequency modulation power source to finish a secondary frequency modulation process. The transient and steady performances of the secondary frequency modulation of the power grid are improved obviously, the frequent start of the traditional frequency modulation machine set is reduced, and balance between supply and demand of the power grid is maintained rapidly.

The invention provides a coordination control method capable of enabling a super-capacitor energy storage system to participate in electric power primary frequency modulation, wherein the super-capacitor energy storage system is arranged on the bus side of a generator set which needs cooperation. A decision optimizing module obtains a frequency from a synchronous vector measurement unit, and the frequency deviation is obtained through the difference between the frequency and a 50Hz frequency. If the deviation exceeds a frequency dead band, the same motion instructions are simultaneously sent to a traditional generator set and the super-capacitor energy storage system. When the super-capacitor energy storage system participates in primary frequency modulation, the opportunity motion and the motion depth of the super-capacitor energy storage system are determined through the decision optimizing module according to partition of typical working conditions, the conversion from the frequency deviation to the power is achieved through a power-frequency conversion module, the charging/discharging control of the super-capacitor energy storage system is achieved through a PCS control module, and finally the traditional generator set is assisted in participating in the primary frequency modulation process. According to the coordination control scheme, the transient state performance and the steady-state performance of the primary frequency modulation can be obviously improved, frequent starting of the traditional generator set is reduced, and the power system frequency can be rapidly kept stable.

The invention discloses an integral vehicle thermal management system for a plug-in hybrid electric vehicle. The integral vehicle thermal management system comprises a high-temperature cooling system,a medium-temperature cooling system, a low-temperature cooling system, a battery cooling system and an air conditioning system. The integral vehicle thermal management system for the plug-in hybrid electric vehicle has advantages that by design according to heating quantity and cooling demands of different parts, mutual influences of parts are avoided, high requirements on utilization temperatureof each part can be met, functions and performances of each part are guaranteed, and the service life of each part is prolonged while efficiency of each part is improved; by integration of a power battery thermal management system and the air conditioning system, the maximum utilization rate of integral vehicle thermal environmental resources is achieved; when warm air is required under a pure electric operating condition, engine waste heat and transmission heat are fully used while a PTC (positive temperature coefficient) heater is applied so as to reduce engine starting frequency, and energy saving, environmental friendliness and comfort of the whole vehicle are improved; by adoption of transmission heat for engine preheating under the pure electric operating condition, the engine starting performance is improved, and economy and emission performances of the whole vehicle are effectively improved.

The invention provides a refrigeration control method of an air cooling refrigerator. The method comprises the steps of: detecting the first temperature of the temperature-changing chamber of the air cooling refrigerator; comparing the detected first temperature with a first preset temperature of the temperature-changing chamber; detecting whether the compressor of the air cooling refrigerator is started or not if the first temperature is higher than or equal to the first preset temperature; refrigerating the temperature-changing chamber until the first temperature is lower than the second preset temperature if the compressor of the air cooling refrigerator is started; otherwise, comparing the first temperature with a third preset temperature; refrigerating the temperature-changing chamber until the first temperature is lower than the second preset temperature if the first temperature is higher than or equal to the third preset temperature, wherein the first preset temperature is lower than the third preset temperature but higher than the second preset temperature. According to the refrigeration control method provided by the invention, the frequent startup of the compressor can be reduced effectively, the service life of the compressor is prolonged and the energy efficiency of the refrigerator is improved.

The invention discloses an efficient and energy-saving type large-discharge double-line hydraulic gas substation system and belongs to the technical field of compressed natural gas filling. The system comprises a hydraulic substation CNG (Compressed Natural Gas) transport trailer, a hydraulic supercharging pry body, an electric control system and a gas filling machine, wherein the hydraulic substation CNG transport trailer is respectively connected with a hydraulic oil way quick coupler, an exhaust gas circuit quick coupler and a jacking block body quick coupler on an operating platform of the hydraulic supercharging pry body, the exhaust pipeline of the hydraulic supercharging pry body is connected to the gas filling machine, and the electric control system is respectively connected with the hydraulic substation CNG transport trailer and a control module of the hydraulic supercharging pry body. The efficient and energy-saving type large-discharge double-line hydraulic gas substation system has the advantages of high efficiency, energy saving, large gas filling capability and stable operation, and the system can be used for realizing stepless regulation of a large range of 1700-4080 m<3>/h and is compatible to the deflation function of hydraulic substation CNG transport trailers of 8 tube 559 series and 6 tube 711 series.

The invention discloses a new energy automobile refrigeration control method. The new energy automobile refrigeration control method comprises the following steps that (a) whether refrigeration switches of a heat ventilation air conditioner and a battery are in an on state or not is judged; (b) when the refrigeration switch of the heat ventilation air conditioner is in the on state, the step (c) to the step (f) are executed and when the refrigeration switch of the heat ventilation air conditioner is in an off state, the step (g) to the step (i) are executed; (c) the compressor initial rotatingspeed is determined according to the rotating speeds corresponding to environmental temperature and set compressor target temperature; (d) the corresponding compressor rotating speed is set accordingto an air blower air volume switch to obtain a first corrected rotating speed of a compressor; (e) a second corrected rotating speed of the compressor is obtained through P-item compensation and I-item compensation ways; (f) a final corrected rotating speed of the compressor is obtained according to the first corrected rotating speed of the compressor and the second corrected rotating speed of the compressor; (g) the compressor initial rotating speed is determined according to the rotating speeds corresponding to the environmental temperature and collected cell temperature; (h) the second corrected rotating speed of the compressor is obtained through P-item compensation and I-item compensation ways; and (i) the final corrected rotating speed of the compressor is obtained according to thecompressor initial rotating speed and the second corrected rotating speed of the compressor.

A controlling method for the screw rod cooling precision air-conditioning system, which comprises the compressor which connect with the condensator, the drying filter, the evaporator, the output pipe and the return pipe for cold water of the condensator, and the PLC controller, the temperature transducer is set on the return pipe for check the temperature of the return-water, the output end of the temperature transducer connect with the input end of the PLC controller, the solenoid valve is in the compressor and the PLC controller and the PID program can achieve auto-regulation of the screw rod cooling precision air-conditioning system and control the temperature of the return water accurately of the central air-conditional system.

An air conditioner able to precisely control temp and humidity for making the temp and humidity constant has a compressor for regulating the output of refrigerant, an expansion valve for regulating the flow of refrigerant flowing in evaporator, a condenser, an evaporator with multiple segments of heat exchanging surface controlled by electromagnetic valves, ambient temp and humidity sensors, a controller, and a refrigerating pipeline.

The invention relates to a multiple variable-flow household water system central air condition. An energy storing water tank forms a closed water system together with the pipelines of the tail end in each chamber and pipelines among the chambers. The water outlet of the energy storing water tank is firstly connected with a constant-voltage frequency converting device and then is respectively connected to the water inlet of the tail end in each chamber through the pipelines; the water outlet pipeline of the water outlet of the tail end in each chamber is provided with an electric valve; the pipelines between the water outlet of the energy storing water tank and the constant-voltage frequency converting device are also connected to a constant-pressure expansion water tank through branch pipelines; the liquid level of the constant-pressure expansion water tank is higher than the highest point of the liquid level in the closed water system; the constant-pressure expansion water tank also takes the effect of making the pressure of the water inlet of the constant-voltage frequency converting device constant while automatically supplementing water for the system; the constant-voltage frequency converting device can be automatically started or stopped according to the working state of an indoor machine unit to achieve the goal of energy saving and consumption reduction, and the frequent starting and stopping phenomena of a heat pump machine unit under the low load condition of the indoor machine unit are also effectively reduced, thereby reducing the operating energy consumption of the heat pump machine unit and prolonging the service life of the machine unit.

The invention discloses a heat pipe air conditioning all-in-one machine with phase change energy storage and a control method thereof. The phase change energy storage, heat pipe heat exchange and steam compression refrigeration are fully integrated, a phase change energy storage module is used for storing a natural cold source at the lower environment temperature, the advantages of a heat exchanger and a steam compression refrigeration air conditioner are combined, and the machine can adapt to changes of the environment temperature at different times; by additionally arranging the phase changeenergy storage module, the residual cold capacity at night is stored and used for refrigeration at the time with high temperature in the daytime, frequency switching between heat exchange and compression refrigeration is avoided while energy is saved, working stability is ensured, the service life is prolonged, at the same time, electricity at night is stored as part of cold capacity through thepeak and valley electric charges at night, time and space limitation of utilization of the cold capacity are broken through, the utilization time of the natural cold source is prolonged, energy is saved effectively, and the operation cost is reduced.

The invention relates to the field of engineering machinery, in particular to an intelligent dust collection system and a filler bin of the intelligent dust collection system applying the intelligent dust collection system. The invention aims to start a dust collection machine for clearing dust when a pressure safety valve pushes open for decompression. The invention has the following technical schemes that the intelligent dust collection system comprises the pressure safety valve, a pressure detecting unit, a control unit and the dust collection machine which are sequentially connected; the pressure detecting unit is used for detecting a real-time pressure value of the pressure safety valve; the control unit is used for presetting a pressure value, and is used for receiving the detected real-time pressure value by the pressure detecting unit, after comparing the real-time pressure value detected by the pressure detecting unit with the preset pressure value, the dust collection machine is controlled to start and stop, due to decompression of the pressure safety valve, meanwhile the surrounding dust is collected by the dust collection machine, thus failure of the safety valve caused by dust can be avoided, and the filler bin can further be prevented from being damaged.

The invention relates to the technical field of vacuum defecation collecting systems, in particular to a novel urban vacuum sewage discharge system. A vacuum pump station comprises a vacuum transfer tank, a water separating tank, a first water circulating vacuum pump, a self-suction sewage discharge pump, a one-way valve, a water inlet solenoid valve and a pressure release valve; the vacuum transfer tank communicates with an outside atmosphere through an air pipeline and communicates with a septic tank through a sewage discharge pipeline; the self-suction sewage discharge pump is arranged on the sewage discharge pipeline between the septic tank and the vacuum transfer tank; the vacuum transfer tank is connected with the first water circulating vacuum pump through a gas pumping pipeline; the first water circulating vacuum pump communicates with the water separating tank through a gas discharging pipeline; a water inlet of the water separating tank communicates with an outside water source through a water inlet pipeline, and the water inlet solenoid valve is arranged on the water inlet pipeline between the outside water source and the water separating tank; and a gas outlet of the water separating tank communicates with the outside atmosphere, and all toilet stool units communicate with a sewage inlet of the vacuum transfer tank through discharging pipelines. The novel urban vacuum sewage discharge system saves energy and water and can remove the foreign odor in sewage.

The invention provides a composite power supply system energy distribution method considering a fuel cell start-stop strategy, and belongs to the field of fuel cells. The method has the advantages ofreducing the number of starting and stopping times of a fuel cell system, improving the system efficiency and prolonging the service life of a power supply. The method includes upper layer control andlower layer control. Upper layer control is used for controlling starting and stopping of a fuel cell, wherein electric quantity data of a storage battery and the load current of an automobile are collected, and starting and shutdown operation of the fuel cell is determined according to the current on-off state of the fuel cell and the electric quantity data of the storage battery. Lower layer control is used for controlling energy distribution, wherein energy distribution is carried out on a fuel cell module and a supercapacitor module according to the electric quantity, collected by a dataacquisition module, of the storage battery, the electric quantity, collected by the data acquisition module, of a supercapacitor and the current demand , collected by the data acquisition module, of aload.

The invention discloses a device for improving the energy conversion efficiency of an air compressor. The device for improving the energy conversion efficiency of the air compressor comprises the air compressor, drying equipment and air storage equipment, wherein the air storage equipment is provided with an air inlet channel and an air supply channel; the air inlet channel is provided with a first valve; the air supply channel is provided with a second valve, a third valve and a fourth valve; the air compressor is connected with the air storage equipment through the air inlet channel; the air supply channel is connected with an instrument air consuming system by connecting the second valve and the drying equipment; and the valves are respectively connected with a nitrogen generation system and a production air consuming system via two pipes. The device for improving the energy conversion efficiency of the air compressor has the advantages that the device is operated flexibly, three air compressor units comprising the instrument air consuming system, the nitrogen generation air consuming system and the production process air consuming system are integrated into an air compressor unit, the energy using efficiency of the systems is improved, frequent starting and unloading of a motor are avoided, electric energy is saved, the problems that the motor of the air compressor unit is started or stopped frequently, and starting current is high, so that a power grid is impacted are solved, and running noise of an air compression station and repair cost for equipment are reduced.

The invention provides an efficient unloading device for a liquefied natural gas (LNG) tank car. The efficient unloading device has the advantages that the LNG gasification rate can be lowered, waste is avoided and the LNG tank car is convenient in unloading.

The invention discloses a water pump automatic control method based on a pressure signal, which comprises the following steps: after a water pump is started, acquiring a current pressure value and a current voltage value of the water pump, judging whether the voltage of the water pump is abnormal according to the current voltage value, if so, carrying out shutdown protection, if not, acquiring a current current value of the water pump, judging whether the water pump is in a stuck state or not according to the current current value, if yes, carrying out shutdown protection, if not, judging the running state of the water pump according to an absolute value of the difference value between the current voltage value and the last voltage value, and then carrying out corresponding water pump protection according to the running state of the water pump. According to the water pump automatic control method based on the pressure signal provided by the invention, automatic control over the water pump is achieved, the water pump can be effectively protected, and the water pump automatic control method has the advantages of being low in cost, stable in control, high in applicability and convenient to maintain.

The invention discloses an oil hot air furnace with an intelligent control terminal. The oil hot air furnace comprises an oil storage tank, a main valve oil filter, a control cabinet, a combustor, anoil pipe, an oil inlet pipe, a chimney, a hot air outlet, a heat exchanger, an air inlet cover, an air blower, an air filter and a cold air inlet; the oil pipe is laid at a passage port of the oil hotair furnace; the oil storage tank is connected to the main valve oil filter through the oil pipe; the control cabinet is arranged on the right side of the main valve oil filter; the combustor is connected to a left port of the heat exchanger; the air inlet cover is connected to a right port of the heat exchanger; a machine base is arranged at the bottom of the heat exchanger; a combustor base isarranged at the bottom of the combustor; the heat exchanger communicates with the air blower through a connecting pipe; an air blower damping base is arranged at the bottom of the air blower; the right side of the air blower is connected to the air filter; and one side of the air filter is connected to the cold air inlet. The oil hot air furnace has the advantages that full-automatic control overthe device is carried out by utilizing the control cabinet, the hot air temperature of the heat exchanger and the hot air temperature of the combustor can be automatically controlled, and the stability of hot air temperature can be guaranteed.

The invention discloses a hydrogen fuel cell automobile starting idle speed control strategy and system, and the method comprises the following steps: presetting an SOC threshold value, obtaining the SOC of a power cell after the automobile is started, enabling a fuel cell to enter a set near-zero power output state when the SOC of the power cell reaches a first threshold value, and enabling the fuel cell to be started again when the SOC of the power cell is lower than a second threshold value, and when the SOC of the power battery reaches a third threshold value, the fuel battery keeps low power output and enters an idle speed state, and the idle speed control strategy of the hydrogen fuel cell automobile is completed through the steps. According to the invention, the performance degradation caused by overhigh voltage of the electric pile in the idling process of the fuel cell automobile can be effectively reduced, and the consumption of hydrogen is reduced to a certain extent.