85 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 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 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 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 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 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 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.

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.

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.

1. Name of the design product: Countercurrent and direct current arc welder. 2. Use of the design product: For welding metal materials. 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.

The present invention relates to the technical field of anti-counterflow, and specifically to an anti-counterflow method for a photovoltaic system, which includes the following steps: periodically sample the voltage at the grid connection point of the photovoltaic system and the grid, continuously obtain the instantaneous measurement values of the voltage, and establish and update an immediate voltage data cache; based on the immediate voltage data cache, extract the voltage data within the most recent fixed time window, calculate the maximum change rate of the voltage amplitude within the time window, and judge and generate a voltage transient trigger signal. In the present invention, by continuously and periodically sampling the voltage at the grid connection point and establishing an immediate voltage data cache, precise capture of voltage disturbances is achieved; through the calculation of the change rate of the voltage amplitude within a specific time window, the precise moment when a voltage transient event occurs can be identified, improving the real-time performance and accuracy of voltage transient detection.

The invention relates to the technical field of energy storage control, and discloses a charging and discharging control method and device for a converter in an energy storage system and the energy storage system.The method includes the steps that a local energy management system obtains expected power corresponding to the energy storage system at the current moment from a preset time-phased charging and discharging power reference database, and when the expected power is charging power, the converter is charged; calculating target charging power based on the active power, the operating power, the expected power and the demand of the anti-countercurrent meter, or when the expected power is discharging power, calculating target discharging power of the energy storage system based on the active power, the operating power, the expected power and a preset anti-countercurrent threshold value of the anti-countercurrent meter, and finally, charging or discharging of the converter is correspondingly controlled based on the target charging power or the target discharging power of the energy storage system, so that charging or discharging operation and corresponding power values of the energy storage system can be adaptively adjusted according to the electricity price and the operation condition of the energy storage system, the variable conditions of dynamic electricity price and load change are adapted, and the energy storage utilization rate is improved.

The utility model relates to an anti-countercurrent system and an anti-countercurrent photovoltaic power generation system. The countercurrent prevention system comprises at least one turn-off device; each turn-off device is connected with a single photovoltaic module, so that the adjacent photovoltaic modules are connected end to end through the turn-off devices to form a photovoltaic group string, and the photovoltaic group string is connected to the inverter; the turn-off device is configured to detect the current flow direction of the single photovoltaic module; under the condition that the current flows reversely, the single photovoltaic module enters a turn-off state so as to cut off the connection between the single photovoltaic module and the photovoltaic group string, and the single photovoltaic module is separated from a power transmission path from the photovoltaic group string to the inverter by a bypass; and under the condition that the current flow direction is a normal flow direction, entering a connected state so that the single photovoltaic modules are connected in series into the photovoltaic group string. 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.

This invention relates to the field of workpiece cleaning technology, and discloses a continuous multi-stage countercurrent rinsing structure and a water washing system. The continuous multi-stage countercurrent rinsing structure includes an upper tank, a lower tank, and a drive pump. The upper tank contains a cleaning tank with a first end and a second end. Multiple cleaning zones are sequentially arranged along the length of the upper tank. The lower tank contains multiple dividing tanks corresponding to the cleaning zones, and the water in the cleaning zones is adapted to flow into the corresponding dividing tanks. From the second end to the first end, the liquid level in the dividing tanks decreases sequentially. The dividing tank near the second end has an inlet, and the dividing tank near the first end has an outlet. The water in the lower tank is adapted to flow from the second end towards the first end. The drive pump is used to extract water from the dividing tanks and transport it to the corresponding cleaning zones. This invention uses multiple dividing tanks to achieve different levels of water cleanliness in the dividing tanks, thereby reducing water discharge during workpiece cleaning.

A battery cell heat exchanger (10) comprising:a first outer plate (12) having a central, generally planar region (18) surrounded by a peripheral flange (20);a second outer plate (14) having a central, generally planar region (18) surrounded by a peripheral flange (20);andan intermediate plate (16) disposed between the first and second outer plates (12, 14) and having a circumferential flange (40), the circumferential flanges (20) of the outer plates (12, 14) being in sealing contact with the circumferential flange (40) of the intermediate plate (16), a plurality of first fluid flow passages (58) formed between the intermediate plate (16) and the first outer plate (12), each of the first fluid flow passages (58) having a first end for admitting a fluid into the first fluid flow passages (58) and a second end for discharging the fluid from the first fluid flow passages (58), the first and second ends defining a direction of flow through the first fluid flow passages (58);a plurality of second fluid flow passages (60) formed between the intermediate plate (16) and the second outer plate (14), each of the second fluid flow passages (60) having a first end for admitting fluid into the second fluid flow passages (60) and a second end for discharging fluid from the second fluid flow passages (60), the first and second ends defining a direction of flow through the second fluid flow passages (60); wherein the battery cell heat exchanger (10) further comprises:a first protrusion (64) extending out of the plane of the peripheral flange (40) of the intermediate plate (16) in a first direction and provided for sealing contact with an inner surface of the second outer plate (14);a first manifold opening (34) formed in the first protrusion (64) and in fluid communication with the first ends of the plurality of first fluid flow passages (58);a second protrusion (65) extending out of the plane of the peripheral flange (40) of the intermediate plate (16) in a second direction opposite to the first protrusion (64) and provided for sealing contact with an inner surface of the first outer plate (12); a second manifold opening (36) formed in the second protrusion (65) and in fluid communication with the second ends of the plurality of second fluid flow passages (60); an inlet in fluid communication with the first manifold opening (34) and for admitting fluid into the battery cell heat exchanger (10);an outlet in fluid communication with the second manifold opening (36) and for discharging fluid from the battery cell heat exchanger (10), wherein the first and second fluid flow passages (58, 60) are arranged to alternate over a main body region such that the first fluid flow passages (58) are in heat transfer relationship with the second fluid flow passages (60); wherein the second ends of the first fluid flow passages (58) are in fluid communication with the first end of the second fluid flow passages (60), and the flow direction of the first fluid flow passages (58) is therefore opposite to the flow direction of the second fluid flow passages (60);

The present invention discloses a portable counter-current flow thermal management system facilitating cooling of a battery pack. System comprises at least one pump, first and second connecting tubes, and heat exchanger unit. The at least one pump enables circulation of a cooling agent with pre-defined rate of flow based on real-time temperature data detected from the battery pack. The cooling agent may include a liquid, a gas, a dielectric fluid, and glycol compound. First connecting tube facilitates flow of cooling agent. Heat exchanger receives and automatically adjusts the temperature of the cooling agent. The second connecting tube receives cooling agent and provides to input terminal is coupled to output terminal along a horizontal axis in a bent fashion facilitating a single interface enabling counter-current flow of cooling agent across battery cells in battery pack.

The present invention discloses a CCD countercurrent washing flocculant uniform feeding system, including a settling tank, a forced dilution pump, a secondary flocculant tube with a feed channel extending into the pump outlet on the feed channel for injecting the diluent into the feed channel and mixing with the material; the flocculant tube is embedded between the forced dilution pump outlet and the feed channel; the number of secondary flocculant tubes is multiple. The CCD countercurrent washing flocculant uniform feeding system provided by the invention, shocks the flocculant tubes by inserting secondary flocculant tubes in each direction between the forced dilution pump outlet, and the injection level with kinetic energy impact.

The present application discloses an anti-counterflow control method, device, electronic device, and photovoltaic grid-connected system. Among them, the anti-counterflow control method includes: obtaining first information reported by a target anti-counterflow device when detecting a counterflow state, the first information including current data and temperature data corresponding to the target anti-counterflow device, and the target anti-counterflow device being any high-voltage anti-counterflow device or low-voltage anti-counterflow device in the anti-counterflow control network; determining a target parameter value according to the current data and temperature data, the target parameter value being used to represent the value corresponding to the fusing parameter, and the fusing parameter including a fusing current threshold and a breaking time; sending a regulation instruction carrying the target parameter value to the target anti-counterflow device, the regulation instruction being used to instruct the target intelligent fuse to adjust the corresponding fusing parameter according to the target parameter value, and the target intelligent fuse being the intelligent fuse deployed in the target anti-counterflow device. The present application is beneficial to realizing the dynamic adjustment of the fusing parameter and optimizing the anti-counterflow effect.