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Recently, the State Intellectual Property Office announced the patent “A Photovoltaic Microgrid Network and Its Control Methodsâ€. The applicant is Yingli Group Co., Ltd.
The invention provides a photovoltaic micro grid networking and a control method thereof. The photovoltaic micro grid networking comprises: a plurality of micro grid sub-modules, the micro grid sub-module comprising: a converter; and the converter a connected photovoltaic array; a battery connected to the converter; a load connected to the converter; an energy storage flywheel connected to the converter; wherein the energy storage flywheel is used to reduce or The fluctuation of the output power of the converter is eliminated; the converter is connected to the power supply grid through the energy storage flywheel. By controlling the working state of the converter and the energy storage flywheel, the fluctuation of the output power of the converter can be reduced or eliminated, ensuring the stability of the output power of the converter and avoiding the load and the battery. damage.
The control method can control the microgrid networking to work in an off-grid mode or a grid-connected mode and control the energy storage flywheel to ensure the stability of the output power of the converter.
Spade bits are used for rough boring in wood. They tend to cause splintering when they emerge from the workpiece. Woodworkers avoid splintering by finishing the hole from the opposite side of the work. Spade bits are flat, with a centering point and two cutters. The cutters are often equipped with spurs in an attempt to ensure a cleaner hole. With their small shank diameters relative to their boring diameters, spade bit shanks often have flats forged or ground into them to prevent slipping in drill chucks.
Some bits are equipped with long shanks and have a small hole drilled through the flat part, allowing them to be used much like a bell-hanger bit. Intended for high speed use, they are used with electric hand drills. Spade bits are also sometimes referred to as "paddle bits".
Spade drill bits are ordinarily available in diameters from 6 to 36 mm, or ¼ to 1½ inches.
Wood Spade Drill Bit,Fat Drill Bit,Paddle Drill Bit,Wood Drill Bit
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