Abstract: A stability control method for a virtual synchronous generator (VSG) in a strong grid based on an inductance-current differential feedback is provided. A grid-connected topological structure of a VSG using the control method includes a direct-current (DC)-side voltage source, a three-phase inverter, a three-phase grid impedance and a three-phase grid. By controlling the VSG and controlling the inductance-current differential feedback, the method suppresses the oscillation of the output power from the VSG in the strong grid and implements the stable operation of an inner-loop-free VSG in the strong grid, without adding the physical inductance, increasing the cost of the filter and additionally providing a grid-side current sensor.

Abstract: Provided is a method for preparing a layered positive electrode material, comprising the following steps: (1) mixing layered nickel cobalt manganese hydroxide with a lithium source, carrying out primary sintering in an oxygen atmosphere, pulverizing and sieving to obtain a primary sintering product; and (2) carrying out secondary sintering on the primary sintering product in a sulfur dioxide atmosphere to obtain a layered positive electrode material, of which the chemical formula is NiaCobMnc(OH)2, wherein 0.3?a?0.95, 0.03?b?0.12, 0.01?c?0.10, and a+b+c=1. Also provided are a layered positive electrode material obtained by the preparation method and a lithium-ion battery comprising the layered positive electrode material.

Abstract: Disclosed are a cathode electrode material and a preparation method and application thereof. A general formula thereof is LiaNi1-x-y-zCoxMnyAlzMbO2, herein 1.04?a?1.08, 0.04?x?0.08, 0.025?y?0.06, 0.03?z?0.09, 0.015?b?0.06, and M is B and at least one selected from Zr, Al, Ti, Mg, Na, Ca, Nb, Ba, Si, P, W, and Sr. Compared with an existing nickel-cobalt-manganese-aluminum cathode electrode material, the cathode electrode material is doped with an M ion. Through the doping of the M ion, the content of a divalent nickel ion may be reduced, thereby the amount of the nickel ions that transit from a crystal plane (003) to a crystal plane (104) is reduced, and the degree of lithium-nickel mixing is reduced, so that the crystal structure of the cathode electrode material is stabilized, thereby the cycle retention rate and thermal stability of the material are improved, as to prolong service life of the material and improve the safety thereof.

Abstract: The present disclosure provides a cathode material, a method for preparing the cathode material and a lithium ion battery. The method comprises: performing a first sintering treatment on a lithium source material and a cathode precursor material to obtain a first sintered product; and coating a surface of the first sintered product with a coating agent and then performing a second sintering treatment to obtain the cathode material, wherein the coating agent is a nickel source material and/or a manganese source material. The method can reduce side reactions in an electrolyte and particles, improve the cyclic retention ratio and prolong the service of the battery without losing the circulation capacity while simplifying a synthetic process, reducing the energy consumption, improving the yield, canceling a water washing process and reducing residual lithium.

Abstract: Provided in the present disclosure are a positive electrode material used for a lithium ion battery. The positive electrode material comprises substrate particles, a first cladding layer that covers the substrate particles, and a second cladding layer that covers the first cladding layer; the substrate particles contain LiNixMny CozM1-x-y-zO2; the first cladding layer contains lithium cobalt oxide; and the second cladding layer contains an oxide of a transition metal.

Abstract: The present invention discloses a quaternary cathode material, an cathode and a battery. Particularly, the present invention provides the quaternary cathode material with a chemical structural formula: LixNia?CobMnc?AldMyO2, wherein 1x1.05,0<y0.025.0.3a?0.95,0.03b01.0.01c?0.05,0.01d0.005 and a?+b+c?+d=1; M is a dopant selecting from at least one of Zr, Al, B, Ti, Mg, Nb, Ba, Si, P, W, Sr and F. The quaternary cathode material has an ?-NaFeO2 type crystal structure. The space group of an X-ray diffraction pattern of the quaternary cathode material is R-3m, and the relationship between a cell parameter c of an axis c and a cell parameter a of an axis a is as follows: c/a>4.943.

Abstract: A dual-mode combined control method for a multi-inverter system based on a double split transformer is provided. For an extremely-weak grid, the method provides the dual-mode combined control method for a multi-inverter system based on a double split transformer. According to the method, the equivalent grid impedance at a point of common coupling (PCC) of one grid-connected inverter (GCI) in the multi-inverter system based on the double split transformer is obtained with a grid impedance identification algorithm, and the system sequentially operates in a full current source mode, a hybrid mode, and a full voltage source mode according to a gradually increasing equivalent grid impedance, thereby effectively improving the stability of the multi-inverter system based on the double split transformer during variation of the strength of the grid. The method ensures that the system can still operate stably in the extremely-weak grid.

Abstract: A stability control method for a virtual synchronous generator (VSG) in a strong grid based on an inductance-current differential feedback is provided. A grid-connected topological structure of a VSG using the control method includes a direct-current (DC)-side voltage source, a three-phase inverter, a three-phase grid impedance and a three-phase grid. By controlling the VSG and controlling the inductance-current differential feedback, the method suppresses the oscillation of the output power from the VSG in the strong grid and implements the stable operation of an inner-loop-free VSG in the strong grid, without adding the physical inductance, increasing the cost of the filter and additionally providing a grid-side current sensor.

Abstract: Provided are a manufacturing method of a liquid crystal display and the liquid crystal display. In the manufacturing method of the liquid crystal display, a transparent flexible film is formed on an array substrate, and then, connection pins are formed on the transparent flexible film, and then, a portion of the transparent flexible film formed with the connection pins is fixed on a side of the array substrate away from an opposite substrate by bending, which can reduce a frame width of a liquid crystal display panel to achieve a narrow frame display.

Abstract: A display device and a manufacturing method of the display device are provided. The display device includes a first substrate, and a flip chip film. The first substrate is provided with bonding pins, conductive adhesive layers, and barriers. Each bonding pin is extended to a side edge of the first substrate, and each bonding pin includes a connecting surface which is flush with the side edge of the first substrate. Each conductive adhesive layer covers one side of each bonding pin, each conductive adhesive layer is extended to the side edge of the first substrate, and the conductive adhesive layer includes an auxiliary connecting surface which is flush with the side edge of the first substrate. Each barrier surrounds side surfaces of each conductive adhesive layer. The flip chip film is connected to the connecting surface and the auxiliary connecting surface.

Abstract: A display device and a manufacturing method of the display device are provided. The display device includes a first substrate, and a flip chip film. The first substrate is provided with bonding pins, conductive adhesive layers, and barriers. Each bonding pin is extended to a side edge of the first substrate, and each bonding pin includes a connecting surface which is flush with the side edge of the first substrate. Each conductive adhesive layer covers one side of each bonding pin, each conductive adhesive layer is extended to the side edge of the first substrate, and the conductive adhesive layer includes an auxiliary connecting surface which is flush with the side edge of the first substrate. Each barrier surrounds side surfaces of each conductive adhesive layer. The flip chip film is connected to the connecting surface and the auxiliary connecting surface.

Abstract: Provided are a manufacturing method of a liquid crystal display and the liquid crystal display. In the manufacturing method of the liquid crystal display, a transparent flexible film is formed on an array substrate, and then, connection pins are formed on the transparent flexible film, and then, a portion of the transparent flexible film formed with the connection pins is fixed on a side of the array substrate away from an opposite substrate by bending, which can reduce a frame width of a liquid crystal display panel to achieve a narrow frame display.