117 results about "Counter current" patented technology

The invention relates to the technical field of countercurrent prevention, in particular to a photovoltaic system countercurrent prevention method, which comprises the following steps of: periodically sampling the voltage of a grid-connected point where a photovoltaic system is connected with a power grid, continuously obtaining an instantaneous measurement value of the voltage, and establishing and updating an instantaneous voltage data cache; and based on the instant voltage data cache, extracting voltage data in the latest fixed time window, calculating the maximum change rate of the voltage amplitude in the time window, and judging and generating a voltage transient trigger signal. According to the invention, on the basis of continuous and periodic sampling of the grid-connected point voltage, an instant voltage data cache is established, and accurate capture of voltage disturbance is realized; by calculating the change rate of the voltage amplitude in the specific time window, the accurate moment when the voltage transient event occurs can be identified, and the real-time performance and accuracy of voltage transient detection are improved.

The present invention relates to the field of backflow prevention monitoring technology, specifically a photovoltaic micro-inverter backflow prevention monitoring method, comprising the following steps: collecting real-time data between the inverter and the power grid through a Hall sensor, the real-time data including voltage, current and frequency, calculating the current power balance state according to the real-time data, and generating a real-time power state; based on the real-time power state, detecting whether there is a potential backflow risk. In the present invention, a Hall sensor is used to obtain the voltage, current and frequency data of the power grid and the inverter, and the backflow risk is calculated in combination with the power balance state, so that data collection can reflect instantaneous power flow and reduce the monitoring blind area caused by fixed collection intervals. Based on the analysis results of the power flow direction, the output power threshold is dynamically adjusted so that the inverter can respond quickly when the power feedback fluctuates, avoiding power feedback imbalance caused by unreasonable threshold setting.

The invention discloses a pipeline combined type single-autorotation intelligent counter-current chromatograph, and relates to the technical field of counter-current chromatographs, the pipeline combined type single-autorotation intelligent counter-current chromatograph comprises a rotating disc, a surrounding separation channel is formed in the rotating disc, a filling block is mounted in the surrounding separation channel, one end of the rotating disc is rotatably mounted through a liquid slip ring, and the other end of the rotating disc is rotatably mounted through a liquid slip ring. The other end of the rotating disc is connected with a main shaft, the main shaft is connected with a driving device, unwinding is conducted in a liquid slip ring mode, the rotating disc can complete unwinding action under single rotation, mixing of two phases in the separation channel can be enhanced through a filling block, and therefore arrangement of a planetary gear train can be abandoned; the main shaft is directly driven by the driving equipment to rotate, and the main shaft drives the rotating disc to rotate to realize two-phase separation and extraction, so that a higher rotating speed can be obtained, and the separation efficiency and effect are improved; and secondly, after the planetary gear train is abandoned, the equipment noise is greatly reduced, and good dynamic balance is achieved.

The invention relates to the technical field of alternating current grid-connected operation countercurrent prevention, in particular to an alternating current countercurrent prevention method which has the advantages that the structure is simple, and countercurrent can be completely prevented; comprising alternating current positive and negative half-cycle phase sampling driving control, a power switch tube and an ideal diode or a universal diode. An alternating current input is connected to the alternating current positive and negative half-cycle phase sampling driving control part for sampling and is connected to the power switch tubes for providing power input, and the alternating current positive and negative half-cycle phase sampling driving control part outputs two paths of signals to respectively drive and control the corresponding power switch tubes. The output of the switching tube passes through the ideal diode or the universal diode and then outputs respective positive half-cycle and negative half-cycle alternating current in parallel.

Procedure for controlling a counter-current system 3 for swimming pools comprising the following steps: a. Providing a swimming pool 1 with a counter-current system 3 for generating a flow 31 of a predetermined flow velocity v in the swimming pool 1, a sensor 4, 5; 6 for generating a control signal depending on the position of a person swimming in the pool 21, 22, 23 and a control unit 7 which, based on the control signal, sets the flow velocity v generated by the counter-current system 3; b. Determining the position of a person swimming in the pool 21, 22, 23; c. Comparison of the determined position with a predetermined position range 41, 51 to generate a control signal for the control unit 7 of the counter-current system 3; d. Increase or decrease the flow velocity v generated by the counter-current system (3) by means of the control unit 7 when the person 22, 23 swimming in the pool is in the predetermined position range 41, 51.

The invention relates to an anti-backflow device, system and method and a power generation system. The anti-countercurrent device comprises an AC-DC conversion power supply module used for taking power from an inverter power grid side to obtain a DC power supply signal to at least supply power to a main control module; the detection module is connected in series in the electric energy output branch of the single photovoltaic power generation unit and is used for detecting, obtaining and outputting a first flow direction signal containing current flow direction information in the electric energy output branch; the electronic switch module is connected in series in the electric energy output branch and is used for connecting or disconnecting the electric energy output branch; and the main control module is used for acquiring the first flow direction signal to obtain the current flow direction and controlling the on-off of the electronic switch module according to the current flow direction. According to the embodiment of the invention, current detection, reverse current blocking and automatic recovery can be automatically controlled by the system, manual intervention is not needed, and the maintenance cost of the power station is greatly reduced.

The invention discloses an anti-countercurrent system based on V2G equipment and a control method, and the system comprises at least two charging and discharging modules which are connected to one side of a power line, and the other side of the power line is connected to a power grid; the charging and discharging module comprises a first bidirectional electric meter and a V2G charging pile. One end of the V2G charging pile is connected with the power line through the first bidirectional ammeter, and the other end is connected with the charging terminal. The bidirectional main electricity meter is connected between the power line and the power grid; the contactor is connected between the bidirectional main ammeter and the power line. The anti-countercurrent control module is in communication connection with the bidirectional main electric meter, the contactor, the first bidirectional electric meter and the V2G charging pile; according to the invention, a virtualized anti-countercurrent control architecture is adopted, any V2G charging pile or cloud server is used as an anti-countercurrent control module, a traditional hardware controller is replaced by existing equipment computing power, global power regulation and control are realized based on data provided by the bidirectional main ammeter and the first bidirectional ammeter, and the system deployment cost and complexity are significantly reduced.

The invention discloses an inverter system anti-countercurrent communication architecture. The architecture comprises a communication network, and a three-phase ammeter, an anti-countercurrent controller and a plurality of inverters which are in communication connection with the communication network. The detection module is used for detecting electric quantity information of a power grid side of the inverter system; the anti-countercurrent controller is suitable for receiving electric quantity information detected by the three-phase electric meter; the anti-countercurrent controller is suitable for selecting part of inverters as main inverters and sending an anti-countercurrent instruction; the main inverter is suitable for receiving the anti-countercurrent instruction and forwarding the anti-countercurrent instruction to the other inverters. The beneficial effects of the application are that the main inverter is arranged in the plurality of inverters and communicates with the anti-reflux controller through the communication bus, and the other inverters communicate with the main inverter, so that information interference when the anti-reflux controller communicates with all inverters can be avoided; therefore, the accuracy of anti-reflux control can be effectively improved.

The invention provides an anti-countercurrent control system and method based on transformer area flexible direct current interconnection, belongs to the technical field of power distribution network and new energy fusion control, and is suitable for direct current flexible interconnection and green energy collaborative utilization of heterogeneous transformer areas such as expressways, parks and urban and rural fusion areas. The system comprises an energy route management module, a transformer area capacity marking module, an energy monitoring module, a flexible direct current interconnection scheduling module, an anti-countercurrent module and an intelligent scheduling strategy module, and the control method comprises the steps of initializing the state of a transformer area, collecting data in real time, judging redundant power and scheduling the redundant power to the transformer area without power generation / grid connection capacity, and executing an anti-countercurrent strategy. And parameters and strategies are optimized based on an intelligent self-learning mechanism. The method achieves the preferential local consumption of new energy, prevents power countercurrent, guarantees the safety of a power grid, improves the adaptability and economical efficiency of the system, and is adaptive to a complex multi-source distributed energy scene.

The invention provides an anti-backflow system, and the system comprises a storage and charging integrated cabin which is used for storing electric energy; the storage and charging integrated cabin comprises a charging pile, an energy storage module, an intermediate relay and a switch which are electrically connected; the control module is configured to obtain static data and dynamic data; determining the output power of the energy storage module and the charging pile based on the static data and the dynamic data; acquiring power supply data; and based on the power supply data, adjusting the power supply condition among the energy storage module, the charging pile and the commercial power, and determining the opening or closing of a first switch node, a second switch node, a third switch node, a fourth switch node, a fifth switch node and an anti-countercurrent contactor, so as to solve the problems that the utilization rate of distributed energy is greatly reduced due to a current anti-countercurrent control scheme; and equipment loss is accelerated, the service life of equipment is shortened, and the operation and maintenance cost is increased.

The invention discloses an energy storage anti-countercurrent protection system, and the system comprises a countercurrent monitoring module which is used for monitoring the related data of a discharge and power generation system. A backup processing module; an adjustment setting module; and protecting the energy storage unit. According to the energy storage anti-countercurrent protection system, historical data of the setting module is adjusted to correspondingly start a corresponding number of power generation modules in the photovoltaic power generation unit to generate power, so that the regulation and control amplitude is reduced, and then the power of the power distribution network is monitored in real time through the countercurrent monitoring module; when the backup processing module detects and analyzes a countercurrent phenomenon, namely the photovoltaic power generation unit discharges too much electric quantity, the backup processing module adjusts the output quantity of electric energy through the adjustment setting module by means of cooperation of an inverter and other related equipment, and charges an energy storage battery module stored in the protection energy storage unit at the same time. Therefore, the protection performance is further improved, and the damage fault of electrical equipment caused by reverse current is avoided.

The invention discloses an energy storage system grid-connected point power cooperative control method and system, and relates to the technical field of energy storage systems, and the method comprises the steps: collecting the secondary voltage and current of a grid-connected point, and calculating the active power P of the grid-connected point; based on the active power P of the grid-connected point, judging whether to trigger an anti-countercurrent control or demand control condition; when anti-reflux control is triggered, an anti-reflux instruction is calculated according to the anti-reflux set value, the anti-reflux return difference and the anti-reflux adjustment multiple; when demand control is triggered, a demand instruction is calculated according to a demand set value, a demand return difference and a demand adjustment multiple; generating a charging and discharging instruction based on the plan curve instruction, the anti-reflux instruction and the demand instruction; according to the invention, on countercurrent prevention and demand instruction calculation, limiting conditions such as the regulation quantity reduction multiple, the regulation quantity amplification multiple and the return difference are introduced, and the power of the grid-connected point can be quickly responded and dynamically regulated under the complex working condition that the load power of the grid-connected point fluctuates severely.

The invention discloses a split-phase anti-countercurrent control method and system for a three-phase inverter. The method comprises the following steps: acquiring output power, load power and grid-connected power of each phase of the three-phase inverter in real time; for each phase, calculating the difference between the load power and the output power, if the difference is less than or equal to 0, judging that the phase has countercurrent, and performing corresponding split-phase control; and if the difference is greater than 0, judging that the phase has a countercurrent trend, and carrying out corresponding split-phase control.

The invention discloses an energy storage system with an anti-countercurrent function and an anti-countercurrent method thereof, an infrared technology is used for monitoring a high-voltage meter and detecting the direction and the size of current in real time, and a specific algorithm and an ems strategy are combined to take anti-countercurrent measures in advance so as to restrain the descending trend of the current, so that the anti-countercurrent function is realized. By monitoring and controlling the charging and discharging process of the energy storage system in real time, the current countercurrent phenomenon is prevented, impact and fluctuation on a power grid are avoided, stable operation of the power grid is guaranteed, and the stability of the power grid is maintained; by cutting off countercurrent in time, user equipment is protected from being damaged, loss of users is reduced, maintenance cost and failure rate of a power grid are reduced, and economic benefits and social benefits of the power grid are improved. By monitoring and controlling the charging and discharging process of the energy storage device in real time, the current countercurrent phenomenon is prevented, the energy storage device is protected against damage, and the service life of the energy storage device is prolonged.

The invention relates to the technical field of photovoltaic power generation, in particular to an anti-backflow system of photovoltaic module-level power electronic equipment and a control method of the anti-backflow system. The system comprises a controller and an anti-countercurrent diode, the input end of the controller is connected with the cathode direct current bus of each photovoltaic string, the output end of the controller is connected with the cathode of the anti-countercurrent diode, and the anode of the anti-countercurrent diode is connected with the PV cathode port of the inverter. The problem of backward flow caused by voltage difference among different photovoltaic strings in the same path of MPPT can be effectively prevented, stable operation of MLPE equipment is guaranteed, and therefore the stability and reliability of a photovoltaic system are improved.

The invention discloses an anti-countercurrent control method, an anti-countercurrent system and a medium, and relates to the field of power electronics. According to the scheme, an inductor is additionally arranged in an existing power utilization system, and the characteristics that the inductor can conduct charging and hinder current changes are utilized; when the electric power of the load is reduced, redundant electric quantity sent to the load by the photovoltaic system and / or the energy storage system through the grid-connected inversion equipment is stored through the inductor, and time is reserved for the operation of adjusting the output power of the grid-connected inversion equipment by the controller, so that when the electric power of the load is suddenly reduced, the load is ensured to be switched off. And the controller can accurately adjust the output power of the grid-connected inverter equipment, thereby ensuring that the electric energy output by the grid-connected inverter equipment cannot be returned to the power grid.

The invention relates to the technical field of power electronics and new energy, in particular to an anti-countercurrent control system and method for photovoltaic charging and charger charging. The method comprises the following steps: acquiring power output data of a photovoltaic power generation system and a charger, and performing energy flow analysis to obtain real-time power distribution parameters; acquiring current sensor data, performing current direction analysis, and generating a countercurrent risk parameter sequence; quickly responding to the countercurrent risk parameter through a countercurrent controller, generating a countercurrent control signal and adjusting the current flowing direction; and in combination with the power distribution parameters, the countercurrent control signal and the temperature data, performing adaptive optimization on the system operation model to generate an optimal control scheme. According to the invention, current countercurrent can be effectively prevented, and system stability and energy utilization efficiency are improved.

The invention provides a pi-type thermoelectric conversion module having excellent cooling performance in which reverse flow of heat is suppressed. A thermoelectric conversion member (A) including a thermoelectric conversion element (M) and a heat countercurrent suppression member (B) including a thermoelectric conversion element (K) are alternately disposed at intervals between a first substrate having a first electrode and a second substrate having a second electrode, the first substrate and the second substrate facing each other. The thermoelectric conversion member A and the thermal countercurrent suppression member B are electrically connected in series via the first electrode on the first substrate and the second electrode on the second substrate, carriers of the thermoelectric conversion element M and the thermoelectric conversion element K are different from each other, one is a hole, and the other is an electron, and the thermoelectric conversion element M and the thermoelectric conversion element K are electrically connected in series via the first electrode on the first substrate and the second electrode on the second substrate. The total SA (m2) of the surface area of the thermoelectric conversion member (A) joined to the first electrode and the second electrode is larger than the total SB (m2) of the surface area of the thermal countercurrent suppression member (B) joined to the first electrode and the second electrode.

The present application discloses a power generation system backflow prevention control system and method, the method comprises the following steps: detecting the total number N of inverters in the power generation system; if N≤preset value N SET , the inverter output power of the power generation system is controlled by data communication to prevent reverse flow; if N> preset value N SET , the inverter output power of the power generation system is controlled to prevent backflow by a non-communication blind adjustment method based on power calculation. The system is used to implement the above method. Beneficial effects of the present application: Compared with the traditional method, in the scenario with a large number of inverters, the power generation system does not need to interact with the inverter for backflow prevention, which can effectively avoid the problem of the system being in a backflow state for a long time or the load taking power from the power grid for a long time due to long communication time, thereby achieving rapid backflow prevention while reducing the user's electricity cost.

A post-treatment process for crude biodiesel containing residual monoacylglycerol (MAG) and including contacting said crude biodiesel with a concentrated alkaline solution, double counter-current washing each followed by a phase separation and drying. The process is economical in chemicals and washing water.

The invention discloses a high-efficiency multistage reverse flow type heat exchanger, which belongs to the technical field of heat exchangers and comprises a front cover and a rear cover, a plurality of heat exchange plates are arranged between the front cover and the rear cover, a circulating conveying mechanism is arranged on the other side of the front cover, and connecting mechanisms are arranged on the front side and the rear side of the front cover. One side of the rear cover is provided with a monitoring mechanism and a locking mechanism, the top of the monitoring mechanism is provided with a linkage mechanism, and the bottom of the monitoring mechanism is provided with a compensation mechanism; the monitoring mechanism comprises a sealing box, a sealing plate and a cross rod, and the linkage mechanism comprises a sealing cylinder, a piston disc, a counterweight plate and a touch button. The multi-point temperature sensor is used for accurately monitoring the inlet and outlet temperature difference change of cold and hot fluid, the heat exchange efficiency and the heat loss state are evaluated in real time, when it is detected that the outlet hot fluid temperature exceeds the expectation, the circulating conveying mechanism is immediately activated, and the hot fluid is guided into the circulating loop again for secondary heat exchange.

A centrifugal pellet dryer system includes a centrifugal dryer, a blower to generate counter-current airflow across the centrifugal dryer, damper(s), moisture sensor(s), airflow sensor(s), processor(s), and a memory. The processor(s) continuously monitor (i) the airflow across the centrifugal dryer via the airflow sensor(s), (ii) the moisture level of the pellets via the moisture sensor(s), (iii) a blower motor load, and (iv) a centrifugal dryer motor load. The processor(s) determine whether the airflow falls below a predetermined threshold, and responsive to such determination, automatically initiate a water and / or air spray to reduce fines within the centrifugal dryer. The processor(s) continuously compare the moisture level of the pellets to predetermined threshold(s), and dynamically adjust the damper(s) and / or the blower motor load, thereby adjusting the moisture level of the pellets. The processor(s) continuously determine whether the slurry requires additional or less water, and automatically adjust water to the slurry based on such determination.

The invention discloses a general power grid control device for preventing inversion current from flowing backwards, which comprises an anti-countercurrent controller and a local air switch, and is characterized in that the anti-countercurrent controller comprises a first terminal, a second terminal, a coupling magnetic ring and an electric switch fluctuation device; and when the anti-inversion controller detects that the inversion current enters the commercial power grid, the electric switch toggle device is controlled to move, so that the commercial power grid and the local micro-grid are disconnected. An original circuit needs to be disconnected and countercurrent control is added, so that the circuit has the advantages of high universality, simplicity in installation and transformation and the like.

The invention discloses an energy storage countercurrent prevention method and system, electronic equipment and a storage medium. According to the scheme, a bus voltage value and a transformer output power value of energy storage equipment connected to a power grid are obtained; comparing the bus voltage value with a set voltage threshold value; when the bus voltage value is greater than or equal to a set voltage threshold value, adopting a high-voltage anti-countercurrent strategy, judging whether countercurrent occurs or not according to the obtained transformer output power value and a preset anti-countercurrent threshold value range, and executing high-voltage anti-countercurrent operation; when the bus voltage value is smaller than a set voltage threshold value, a low-voltage anti-countercurrent strategy is adopted, whether countercurrent occurs or not is judged according to the obtained transformer output power value and a preset anti-countercurrent threshold value range, and low-voltage anti-countercurrent operation is executed; the bus type is determined by detecting the bus voltage, the energy storage equipment is subjected to countercurrent prevention by matching the corresponding countercurrent prevention strategy, the access conditions of different energy storage equipment are compatible, and the countercurrent prevention effect is improved; the embodiment of the invention can be widely applied to the technical field of data processing.

The utility model provides an anti-countercurrent photovoltaic power generation system. The anti-countercurrent photovoltaic power generation system comprises a photovoltaic assembly; the input end of the inverter is connected with the output end of the photovoltaic module; the alternating-current relay is provided with a first end, a second end and a control end, the first end is connected with the output end of the inverter, and the second end is connected with an electric load and a grid-connected device; and the anti-countercurrent controller is connected with the control end of the alternating-current relay and the electric load respectively, and is used for preventing countercurrent by disconnecting the alternating-current relay and / or reducing the power of the inverter under the condition that the grid-connected device obtains the electric energy output by the inverter. The utility model has the advantages that the grid-connected device can be monitored in real time to obtain the condition of the output electric energy of the inverter, and the countercurrent phenomenon can be effectively prevented by disconnecting the alternating-current relay and / or reducing the power of the inverter.

A method of absorbing a solvent from a gas stream may involve flowing a gas stream comprising air and a hydrocarbon through an absorption column in a countercurrent direction with a first lean absorbent liquid to absorb solvent out of the gas stream and generate a first conditioned gas stream and a first rich absorbent liquid. The method can then involve flowing the first conditioned gas stream through the absorption column in a co-current direction with a second lean absorbent liquid to absorb solvent out of the first conditioned gas stream and generate a second conditioned gas stream having a reduced concentration of the hydrocarbon than the first conditioned gas stream and a second rich absorbent liquid.

The invention belongs to the technical field of photoelectric power generation, and particularly discloses a photovoltaic inverter countercurrent prevention system and a control method, the photovoltaic inverter countercurrent prevention system comprises a first relay, a second relay, a third relay, a fourth relay, an intelligent electric meter, a processor, a memory, an illumination intensity detection module and a temperature detection module; the processor carries out anti-reflux processing according to the following processes: the processor controls the first relay and / or the second relay and / or the third relay and / or the fourth relay to be switched off or switched on according to preset time; or the processor controls the first relay and / or the second relay to be switched off or switched on according to the power data uploaded by the intelligent electric meter at the current moment; the preset time is determined by load electric power and photovoltaic power generation total power in a historical preset time period; according to the invention, anti-reflux control can be carried out more flexibly and accurately.

A capsicum annum extract composition (600) includes capsanthin in the range from 1%-1.5%, zeaxanthin in the range from 0.5% to 1%, and cryptoxanthin in the range from 0.1% to 0.5%. The composition is created, at least in part, from material spent from purifying carotenoids using counter current extractions, and the composition enhances skin, eyes, or hair.

1. Name of the design product: Countercurrent device. 2. Use of the design product: To change the direction of water flow and make the water in the pool circulate. 3. Design key points of the design product: Lies in the shape. 4. Picture or photo that best shows the design key points: Perspective view 1.