12results about How to "Avoid charging and discharging" patented technology

The invention relates to the technical field of photovoltaic power generation energy storage grid connection, and discloses an optical storage VSG control method and system for coordinating power maximum output and energy storage, and the method comprises the steps: building an output power-angular frequency model between the output power of an inverter and the angular frequency of a VSG virtual rotor based on a VSG control principle; establishing a direct current capacitor voltage-output power model; establishing a control model of the proportional relation between the direct current side voltage and the output frequency deviation; simulating droop control between the input power and the rotor speed in the synchronous generator, associating the battery power with the direct current side voltage, establishing a battery droop control strategy, and transferring the battery power change response demand to a direct current side capacitor; active-power control in a traditional photovoltaic energy storage power generation system control principle is optimized, and a battery droop control strategy is established, so that battery power change response demands are transferred to a direct current side capacitor, more photovoltaic energy is utilized, and demands and adverse effects on photovoltaic power generation absorbed by a local battery are reduced.

The invention provides a new energy range-extended heavy truck energy distribution method based on SOC and driving power, which is applied to a hybrid mode of a hybrid new energy range-extended heavy truck and comprises the following steps: acquiring a vehicle state of the hybrid new energy range-extended heavy truck, historical driving power data and a current SOC of a battery module; determining average driving power based on the historical driving power data; determining a first weighting coefficient based on the current SOC, and determining a second weighting coefficient based on the vehicle state; determining compensation driving power based on the first weighting coefficient and the second weighting coefficient; and determining the required driving power based on the average driving power and the compensation driving power. According to the scheme, the vehicle state and the SOC of the new energy extended-range heavy truck are considered in the hybrid mode, the required generation power is determined in real time, energy distribution is carried out, and the dynamic property and the fuel economy of the system are guaranteed.

The invention relates to the technical field of photovoltaic energy storage, in particular to an energy storage system collaborative optimization method based on photovoltaic power prediction. Comprising the steps of generating a fluctuation evaluation value of a current adjustment period according to historical operation parameters; setting the energy storage capacity of the energy storage system in the current adjustment period according to the fluctuation evaluation value; and setting a current adjustment period according to the fluctuation evaluation value to establish a plurality of time intervals, and setting a control strategy in each time interval according to the photovoltaic expected power in each time interval. The safe energy storage capacity of the energy storage system is dynamically adjusted according to the periodic fluctuation evaluation value, multiple time intervals are established in a single adjustment period, the working state of the energy storage system is dynamically adjusted, output or storage of electric energy is controlled, the efficiency of stabilizing photovoltaic output fluctuation is improved, and the energy storage efficiency is improved. Excessive charging and discharging of the energy storage system are avoided, and the service life of the energy storage system is prolonged.

The embodiment of the invention provides an intelligent power distribution box and a charging and discharging control method, the intelligent power distribution box comprises a load metering board, the load metering board comprises a plurality of controllable load loops, at least one controllable load loop comprises a change-over switch and a plurality of access loops, the plurality of access loops are different in resistance value, and the change-over switch is connected with the load metering board. The change-over switch is used for communicating with one of the plurality of access loops; the charging and discharging integrated gun is in communication connection with the load metering plate through a signal line, a power line of the charging and discharging integrated gun is connected with at least one controllable load loop, the access loop comprises at least part of the signal line, and the charging and discharging integrated gun is used for being connected with an electric automobile; the access loop comprises a charging loop and at least one discharging loop, and a handshake resistor of the discharging loop is related to the type of the electric automobile. According to the technical scheme, the charging and discharging integrated gun is arranged in the distribution box, and discharging and charging of different types of electric automobiles can be achieved through switching of the multiple access loops.

This invention discloses a high-precision single-ended read circuit based on a voltage-controlled magnetic anisotropic magnetic memory (VMI). The circuit includes a master-slave RFSE read sensing circuit, a finely adjustable voltage divider circuit, and a read control signal generation circuit. The master-slave RFSE read sensing circuit comprises two independent RFSE read sensing circuits, enabling alternating read operations during the reset and sensing phases. The finely adjustable voltage divider circuit fine-tunes the bit line voltage within a ±10% range of the voltage divider resistor to compensate for process variations and voltage drift. The read control signal generation circuit generates an adjustable asynchronous read control signal through a read delay chain structure. The memory cell being read consists of a magnetic tunnel junction (MTJ) and a memory access transistor. This circuit innovatively introduces a finely adjustable voltage divider circuit, eliminating the need for a traditional reference cell and effectively resisting PVT fluctuations. High-speed, high-precision asynchronous reading is achieved through the master-slave RFSE read sensing circuit and the read control signal generation circuit.

The present invention provides an active battery voltage equalization circuit and current equalization method, wherein the circuit includes: multiple lithium batteries connected in series; thyristor circuits respectively connected to both ends of each lithium battery, and the connection between the previous lithium battery and the next lithium battery shares the thyristor circuit; the thyristor circuit includes a first thyristor, a second thyristor, a first diode and a second diode, wherein the first thyristor and the second thyristor are connected in series, the first diode is connected in parallel with the second thyristor, and the second diode is connected in parallel with the first thyristor; multiple conducting thyristors respectively connected between the thyristor circuits at both ends of each lithium battery; and energy storage inductors connected in parallel to both ends of the multiple conducting thyristors. It can realize active voltage equalization of lithium batteries at different positions, and can adjust the size of the equalization current according to the working state of the lithium battery, effectively save resources, and extend the battery life.

This invention relates to the field of marine power system control technology, and particularly to a hybrid power management method for ships based on the synergy of shaft-driven power generation and lithium batteries. The method includes: real-time acquisition of the ship's power grid load demand, the output power of the shaft-driven power generation system, the state of charge of the lithium battery system, and the rotational speed of the ship's main engine; adaptively determining the current system operating mode; calculating the real-time power difference between the load demand and the output power of the shaft-driven power generation system; generating a target charge / discharge power for the lithium battery system; obtaining a safe command charge / discharge power; controlling the lithium battery system to execute the command charge / discharge power, and controlling the shaft-driven power generation system to operate according to the target of the current mode. Through precise power scheduling and adaptive switching of system operating modes, the method ensures that the ship's power system always operates in an energy-optimal state under different operating conditions.

The utility model discloses a 180-degree full luminescence variable power solar energy yard lamp relates to yard lamp technical field, including lamp body and seal cover, the seal cover is threaded sleeve on the lamp body upper side, the lower surface of lamp body is provided with a plurality of mounting groove in annular array distribution, the inner side of each mounting groove is fixedly embedded with the lamp panel, and the lamp panel is fixed on the lamp body. A solar power generation assembly is fixedly embedded in the upper surface of the sealing cover; a transverse rod is arranged on the upper side of the sealing cover, a brush strip is fixedly installed on the lower side of the transverse rod, the lower end of the brush strip abuts against the solar power generation assembly, an installation pipe is fixedly arranged on the lower side of the lamp body, and a transmission mechanism driving the transverse rod to rotate with the installation pipe as the axis is arranged on the outer wall of the installation pipe. The full-view lighting device can perform full-view lighting without dead angles, and meanwhile, the full-view lighting device is clean energy charged by solar energy, so that the advantages of energy conservation and emission reduction are exerted to the greatest extent.

The invention provides a battery management method based on SOC dynamic correction and charging current limiting, and relates to the technical field of battery management, and the method comprises the steps: obtaining the real-time voltage and real-time current of a monitored battery; calculating the real-time battery electric quantity of the monitoring battery according to the real-time current; if it is determined that the working state is a charging state and the real-time battery electric quantity reaches a preset first electric quantity, the tail end charging current of the monitoring battery is calculated based on the real-time voltage and the real-time current, and a charging circuit of the monitoring battery is controlled to charge the monitoring battery with the tail end charging current; if it is determined that the working state is the discharging state, whether the real-time battery electric quantity is lower than preset second electric quantity or not is judged; and if it is determined that the real-time battery electric quantity is lower than the preset second electric quantity, carrying out discharging tail end pre-undervoltage SOC dynamic correction based on the real-time battery electric quantity, the real-time voltage and the real-time current, and calculating the corrected battery electric quantity of the monitored battery. According to the invention, more intelligent battery management can be realized.

A kind of pressure casting machine pressurization loop hydraulic system, including pressurization cylinder, injection cylinder, pressurization accumulator, proportional flow valve, servo valve and cartridge valve, the piston rod of pressurization cylinder is communicated with the rodless cavity of injection cylinder, the rear cavity of pressurization cylinder is connected with the A port of proportional flow valve, the B port of proportional flow valve is connected with pressurization accumulator, the front cavity of pressurization cylinder is connected with servo valve, cartridge valve respectively.The present application has the following beneficial effects:1, servo valve is set in the pressurization cylinder discharge port, the entire pressurization process is carried out real-time closed-loop control, even when external conditions change, also can guarantee very high repeatability, and the quality of die casting is stable;2, can provide shorter build pressure time, satisfy the rich process requirement to various die castings, and the adaptability is strong;3, pressurization pressure can be quickly adjusted, and then adjust pressurization effect, avoid frequent to accumulator charges nitrogen.

The present invention discloses a method and system for suppressing harmonics in the process of charging an electric vehicle in a grid-connected state. The method for suppressing harmonics in the process of charging an electric vehicle in a grid-connected state includes: obtaining the expected charging current corresponding to the model of the electric vehicle and its corresponding controllable range of variation; detecting the charging current in the process of charging the electric vehicle, and judging whether there is harmonic current in the charging current; when the judgment result is yes, obtaining the comparison result of the difference between the detected charging current and the expected charging current and the controllable range of variation; and when the comparison result shows that the difference exceeds the controllable range of variation, filtering out the harmonic current in the charging current in real time through an active power filter. The present invention has a good harmonic suppression effect, selectively processes harmonics, improves the stability of the power grid, and increases the service life of power grid components.

The present application relates to the technical field of power system frequency regulation and new energy grid-connected control, in particular to a kind of energy storage adaptive droop primary frequency modulation method and system of online rolling optimization, the method real-time acquisition system frequency deviation, frequency rate of change and energy storage state of charge;Adopt hot start strategy to inherit the population state of last cycle, and initialize the population of current cycle with the optimal solution neighborhood of last cycle;Through grey wolf optimization algorithm online rolling optimization, to solve optimal droop adjustment coefficient with the multi-objective comprehensive fitness function of frequency regulation performance index, energy storage SOC double threshold nonlinear square penalty and power smoothing term as target;First-order low-pass filter is applied to output to obtain dynamic droop coefficient, according to which the energy storage power reference instruction is calculated and charging and discharging is executed.The present application transforms grey wolf optimization algorithm from offline setting to online rolling optimization engine, realizes millisecond-level real-time response through hot start and simplified iteration, realizes the collaborative optimization of frequency modulation performance and energy storage safety through SOC square penalty, and significantly improves the working condition adaptive ability of system to photovoltaic fluctuation and load disturbance.