Abstract: An alternating current electrolysis system, as well as a method and a device for controlling the alternating current electrolysis system are provided. The method includes: acquiring a voltage amplitude at an alternating current side of an electrolysis rectification power supply; and modifying an output parameter of the electrolysis rectification power supply based on the voltage amplitude. Compared with the conventional technology, the problem of oscillation of a power grid due to unbalanced power of the alternating current electrolysis system is effectively solved, thereby facilitating normal operation of a electrolysis station.

Abstract: An efficient multi-dimensional carbon source and a method for preparing the same are disclosed. The efficient multi-dimensional carbon source includes the following components by weight: 30%-50% of alcohols, 20%-30% of biomass digestive liquid, 1%-10% of carbohydrates, 0.5% of polymethyl methacrylate and balance of water. A method for preparing the efficient multi-dimensional carbon source is further disclosed.

Abstract: A method for monitoring impedance of an electrolyzer, a controller and a power supply system are provided. In the method, according to a basic electric energy command, a power supply connected with the electrolyzer is controlled to output a DC component signal used for normal operation of the electrolyzer, and according to an impedance scanning electric energy command, the power supply is controlled to output AC component signals used to monitor the impedance of the electrolyzer. Further, a voltage vector and a current vector outputted by the power supply are acquired, and an impedance value of the electrolyzer is calculated according to the voltage vector and the current vector.

Abstract: A method for controlling an alternating current cascade photovoltaic power generation system is provided, which includes: acquiring, by a master controller, a current total output power of the system; determining, by the master controller, whether the total power value is greater than a preset power value; generating, by the master controller, a first control signal if the total power value is greater than the preset power value; generating, by the master controller, a second control signal if the total power value is smaller than or equal to the preset power value; receiving, by the slave controller, the first or second control signal generated by the master controller; and controlling, by the slave controller based on the first control signal, a cascade unit to independently perform an MPPT operation, or controlling, by the slave controller based on the second control signal, the cascade unit to output power.

Abstract: A packaging box includes a bottom plate, two cover plates, two external plates, two internal plates, and four flaps. Each of the flaps has an engaging opening. When the packaging box is formed, the four flaps are respectively folded to closely contact the corresponding external plates, and the two internal plates are respectively folded to be inserted into the engaging openings of the two flaps on the corresponding sides, to save materials of the packaging box.

Abstract: A method for controlling an alternating current cascade photovoltaic power generation system is provided, which includes: acquiring, by a master controller, a current total output power of the system; determining, by the master controller, whether the total power value is greater than a preset power value; generating, by the master controller, a first control signal if the total power value is greater than the preset power value; generating, by the master controller, a second control signal if the total power value is smaller than or equal to the preset power value; receiving, by the slave controller, the first or second control signal generated by the master controller; and controlling, by the slave controller based on the first control signal, a cascade unit to independently perform an MPPT operation, or controlling, by the slave controller based on the second control signal, the cascade unit to output power.