8results about How to "Improve power conversion efficiency" patented technology

This invention discloses an unmanned intelligent photovoltaic green electricity distribution device for mines, featuring source-grid-load-storage coordination. The device includes a base, with a nested shock-absorbing assembly at the top. Above the nested shock-absorbing assembly is an energy storage distribution box. An energy storage interface compartment is connected to the left side of the energy storage distribution box, and a distribution control box is located on the right side. A flexible connection assembly is positioned above the energy storage distribution box, and a source-grid adapter box is located above the flexible connection assembly. A dual-path photovoltaic rectifier compartment is located on the left side of the source-grid adapter box, and a mine microgrid connection compartment is located on the right side. Utilizing the dual-path photovoltaic rectifier compartment within the source-grid adapter box, synchronous conversion of two photovoltaic DC power sources is achieved, improving power conversion efficiency and filtering power noise. The mine microgrid connection compartment integrates voltage regulation and lightning protection functions, enabling efficient connection with the mine microgrid.

This invention provides a wide-bandgap perovskite thin film, a perovskite tandem solar cell, and a method for preparing the same, relating to the field of photovoltaic technology. The method for preparing the perovskite thin film includes: adding a perovskite structural material and an organic additive to an organic solvent to obtain a perovskite precursor solution; spin-coating the perovskite precursor solution onto a substrate; and annealing the substrate to obtain the perovskite thin film. The organic additive includes a material containing a thiophene dioxide framework. The organic additive used in this invention can effectively regulate the crystallization rate of mixed halides, delay crystallization, enhance the uniform distribution of the mixed halide phase, reduce the defect density in the wide-bandgap perovskite thin film, and significantly improve the power conversion efficiency and stability of the solar cell, thereby obtaining a high-performance tandem solar cell.

The application provides a droop control method and device for an energy storage system in a direct-current microgrid, and the method comprises the following steps: obtaining an initial droop curve; determining a boundary condition of a droop control parameter in the droop curve; establishing a target function with the highest cycle efficiency of the energy storage system in full charging and full discharging as a target; establishing a droop curve optimization model according to the target function and the boundary condition; solving the droop curve optimization model to obtain an optimal solution of the droop control parameter, so as to update the initial droop curve; and controlling the energy storage system by using the updated droop curve. The application can improve the power conversion efficiency of the energy storage system, and improve the economy and service life of the energy storage system and even the entire direct-current microgrid.

The application relates to a flexible charging module control method and device supporting V2G, comprising the following steps: determining whether there is a hard switching risk according to the comparison result of the load power value and the preset threshold value; in the case that there is a hard switching risk, adjusting the resonant frequency of the CLLL topology to the first frequency interval based on a frequency-duty cycle hybrid modulation strategy, making the resonant current phase and the switch tube voltage phase form a preset phase difference, and adjusting the drive signal duty cycle of the primary side switch tube and the secondary side switch tube, so that the conduction time difference of the primary side switch tube and the secondary side switch tube increases with the decrease of the load power value; based on an adaptive frequency spectrum expansion algorithm, the resonant frequency is periodically dithered in the first frequency interval with a preset step, and the dithering period and the switching period of the switch tube are in a nonlinear mapping relationship; the bidirectional power conversion efficiency is improved, the light load hard switching and electromagnetic interference problems are solved, and the reliable operation of the charging module in the V2G scene is ensured.

The utility model discloses a rectification voltage stabilizing circuit based on 555 timer and reference voltage chip relates to power supply circuit technical field, the circuit in the utility model, provide stable reference voltage through reference voltage chip, according to the duty cycle of the output pulse of comparison result adjustment, can realize the high precision voltage stabilizing output, satisfy the power supply demand of high precision electronic equipment, utilize common 555 timer and reference voltage chip, compared with the dedicated voltage stabilizing chip, the cost is reduced obviously, has higher cost performance, is suitable for large -scale production and application, through the output signal in control 555 timer module, can conveniently adjust output voltage, to adapt to the demand of different load and application scene to voltage, the PWM circuit of 555 timer composition can realize higher power conversion efficiency, reduce power loss, improve the overall performance of circuit.

This application relates to a portable, self-shielded electron accelerator irradiation device for wastewater treatment, comprising: a portable housing as the main body; an electron accelerator disposed within the portable housing for providing an irradiated electron beam; a wastewater processor disposed within the portable housing and located below the irradiation window of the electron accelerator for receiving the irradiated electron beam and treating wastewater; a sub-beam tank connected to the wastewater processor and located below the electron accelerator for receiving the treated wastewater; a control system disposed within the portable housing and connected to the electron accelerator for controlling the operation of the electron accelerator; and a shielding body that at least covers the irradiation window and the wastewater processor, for at least shielding the irradiation energy of the irradiation window and the wastewater processor. This device is portable and offers significant convenience and efficiency for wastewater treatment.

This invention relates to the field of integrated design of power electronic converters and magnetic components, and discloses an application method of three-phase PFC integrated magnetic technology, including: configuring excitation windings in the independent magnetic circuit branches of the magnetic core so that the excitation currents of each phase differ by a phase angle of 120° on the time axis; establishing a magnetic flux balance path in the common area inside the magnetic core, and forming a virtual magnetic neutral point with equal magnetic potential by utilizing the spatial vector synthesis and instantaneous polarity cancellation of the fundamental magnetic flux; setting a non-uniform magnetoresistive layer between the side column and the middle column to establish a gradient magnetoresistive distribution field, guiding the high-frequency ripple magnetic flux to be constrained within a specific leakage magnetic path, and orthogonally distributed with the main energy conversion path in electromagnetic space. This invention achieves electromagnetic decoupling of the inductance parameters of each phase of the integrated magnetic component by constructing a virtual magnetopotential zero point and orthogonal magnetic circuits, maintaining the independence of dynamic response, eliminating cross-phase parameter disturbances, and reducing the overall volume of the magnetic component.

The application discloses a photovoltaic device and a preparation method thereof, and belongs to the technical field of photovoltaic devices. The photovoltaic device comprises, from bottom to top, a substrate, an electron transport layer, a YbBr3 spin-coated modified PbS-PbX2 quantum dot layer, a PbS-EDT layer and a metal layer. In the photovoltaic device, YbBr3 is spin-coated on the surface of a PbS-PbX2 quantum dot layer after halogen ligand exchange is completed, so that Yb 3+ / Br ‑ forms an ionic coordination bond on the surface of PbS; first, by utilizing the quantum confinement characteristics of Yb 3+ , two 980 nm near-infrared photons are emitted after visible light with higher energy is absorbed, and then the photons are absorbed by adjacent PbS quantum dots again, so that the utilization rate of the photons is improved, and the short-circuit current and overall power conversion efficiency are significantly improved; second, Yb 3+ / Br ‑ passivates the surface vacancy defects, reduces the surface trap density, prolongs the carrier lifetime, improves the open-circuit voltage and the fill factor.