Abstract: An inverter, a method for turning off an inverter, and a photovoltaic system are provided. Pulse blocking is performed on the inverter circuit in response to a short circuit of a negative electrode of a DC source to ground. Upon determining that a current of a first switching module is in a descending trend after the inverter circuit is subjected to the pulse blocking, the first switching module and a second switching module with a current of zero are turned off simultaneously in response to a first electrical parameter of the first switching module reaching a preset electrical parameter; or the first switching module and a second switching module with a current of zero are turned off simultaneously within a first duration starting from a time instant when an actual electrical parameter of the first switching module reaches the preset electrical parameter.

Abstract: A circuit for protecting a micro inverter and a circuit system having micro inverter topology. The circuit includes a current sampling module, a hardware adjusting module, and a shutdown module that are sequentially connected. The current sampling module is configured to collect a first current signal in a bridge arm, in which a switch transistor is located, in secondary-side bridge arm circuitry including switch transistors. The hardware adjusting module is configured to receive the first current signal and a reference current signal and output an overcurrent indicating signal for the first current signal. The shutdown module is configured to receive the overcurrent indicating signal and a grid-polarity signal and output a shutdown control signal for the switch transistors, to enable secondary-side driving circuitry to shut down the switch transistors in the secondary-side bridge arm circuitry.

Abstract: A transformer and a transformer machining process, including two coil units arranged side-by-side, each unit including an inner coil and an outer coil sleeved on the outside of the inner coil, an outer coil semi-conductive layer being wrapped on the outside of the outer coil and an inner coil semi-conductive layer being wrapped on the outside of the inner coil, and an insulating layer being integrally cast with the coil unit. In the transformer provided by the present application, the arrangement of the outer coil semi-conductive layer and the inner coil semi-conductive layer can effectively improve the problem of excessive local field strength caused by an irregular coil structure and solve the issue of wire package cracking caused by steel material generating heat in a pouring body; thus, the transformer has improved safety.

Abstract: An inverter, a method for controlling an operation mode, and an inverter system are provided. The inverter includes a detection circuit and a controller. The detection circuit is configured to detect a state of an auxiliary switch in a junction box, and send the state of the auxiliary switch to the controller. The controller is configured to determine an operation mode of the inverter based on the state of the auxiliary switch. The state of the auxiliary switch is synchronized with a state of a power switch in a first switch assembly. The state of the power switch in the first switch assembly is used to indicate a state of a power grid.

Abstract: A multi-channel alkaline hydrogen production system is disclosed. Using liquid outlets of a hydrogen alkali treatment unit and an oxygen alkali treatment unit, a circulating alkaline liquid is outputted to an alkaline liquid circulating pump and a controllable channel, and then the circulating alkaline liquid is returned to the negative electrode of an electrolyzer; Thus, a controller can control the amount of produced hydrogen according to the measured current of the electrolyzer, then calculates a corresponding alkaline liquid circulation volume reference value according to the amount of produced hydrogen, and according to the alkaline liquid circulation volume reference value, adjusts the circulation amount of the alkaline liquid of the multi-channel alkaline hydrogen production system and changes the gas purity of the multi-channel alkaline hydrogen production system by controlling the working states of the controllable channels on the two ends of the alkaline liquid circulating pump.

Abstract: A photovoltaic system and a communication method therefor. The communication method includes: each slave sends a report signal to a host, and monitors a response signal of the host; and if the at least one slave receives the response signal, the corresponding slave executes a corresponding action on the basis of the response signal. Therefore, communication between the host and each slave is achieved in a mode that each slave actively sends the report signal, the host is prevented from adopting a roll call query mode, and occupation of bus resources by the host is reduced.

Abstract: A power conversion device and an integrated machine are provided, The power conversion device includes a housing and a power converter. The power converter is arranged in the housing, and two ends, opposite to each other, of the power converter are respectively provided with a direct current wiring area and an alternate current wiring area. Two ends of the housing corresponding to the direct current wiring area and the alternate current wiring area each is provided with a movable door being capable of being opened and closed.

Abstract: An inverter, a control method of the inverter, and a power system are provided. The inverter includes a DC bus, an inversion circuit, a controller, and multiple boost circuits. An input terminal of each boost circuit is configured to connect to a corresponding photovoltaic unit, output terminals of the boost circuits are connected in parallel and connected to the DC bus, and the inversion circuit is configured to convert DC power outputted by the DC bus into AC power. The controller is configured to: determine, during an operation stage of the inverter, a to-be-adjusted boost circuit from the boost circuits, in response to determining that there is a loss boost circuit in a preset loss condition among the boost circuits; and adjust the to-be-adjusted boost circuit while ensuring that a change threshold for a total power output of the boost circuits is less than a preset adjustment threshold.

Abstract: A method for detecting arcing, an inverter and a photovoltaic system are provided. The inverter includes an inverter circuit and at least one DC/DC conversion circuit. The method includes: stopping outputting a control signal to a first DC/DC conversion circuit that is currently being suspected of having an electric arc, and operating other DC/DC conversion circuits connected to the inverter circuit normally; decreasing a voltage at a power supply side of the first DC/DC conversion circuit immediately after a first preset period of time elapsed; and determining that no arc fault occurs, and restoring the voltage at the power supply side of the first DC/DC conversion circuit to a first voltage that the first DC/DC conversion circuit receives before the stopping outputting the control signal, if a current at the power supply side is greater than or equal to a first preset current during the decreasing the voltage.

Abstract: A charging pile is provided, including: a charging unit and at least one air-cooled radiator arranged in a box; the box includes a first box and a second box, a protection level of the first box is higher than a protection level of the second box; the charging unit is arranged in the first box; an independent heat dissipation air duct is provided in the second box so that the charging unit dissipates heat through the heat dissipation air duct; and the charging unit is configured to charge an electrical equipment, thereby avoiding need to design a heat dissipation module for each power conversion module in the charging pile and then perform a secondary design of the heat dissipation air duct on the entire charging pile in the conventional technology, which reduces cost of the charging pile and improves a level of protection of the charging pile.

Abstract: A grounding structure and electrical equipment are provided. The electrical equipment includes a case having a grounding requirement and a functional device at least partially disposed outside the case; the grounding structure includes at least one grounding connecting portion, and the grounding connecting portion is disposed on the housing wall of the part, located outside the case, of the functional device; and the housing wall of the functional device is conductively connected to the case.

Abstract: A circuit, method and device for addressing CAN nodes are provided. The circuit includes: a fuse adapter board including a short-circuited circuit; a first CMU including a first MCU and a first CAN identification circuit; and a second CMU including a second MCU and a second CAN identification circuit. The fuse adapter board is connected to the first MCU or the second MCU through the short-circuited circuit, and is configured to control the short-circuited circuit to be shorted to enable a level on a GPIO pin of the first MCU or the second MCU connected to the short-circuited circuit to be a low level, so that the first MCU and the second MCU set their respective CAN addressing based on the respective levels of the respective GPIO pins.

Abstract: A new energy hydrogen production system and a control method therefor. In the new energy hydrogen production system, a new energy input module supplies power to electrolytic cells by means of a power conversion module; and a control system of the new energy hydrogen production system is used for controlling, according to the power of the new energy input module, the power conversion module to work, such that among N electrolytic cells in an operation state, at least N-1 electrolytic cells work in a preset load range. The preset load range is a corresponding load range having the highest system efficiency in an electrolytic cell working range division result prestored in the control system.

Abstract: A method and device for controlling an inverter, an inverter and a photovoltaic system are provided. Maximum voltage among input terminals of multiple boost circuits included in the inverter and a minimum voltage for grid-connection are obtained. When the maximum voltage is greater than or equal to the minimum voltage, a first boost circuit in the inverter is controlled to stop boosting. The voltage at an output terminal of a second boost circuit is controlled to be increased to the maximum voltage, and the second boost circuit includes other boost circuits in the inverter other than the first boost circuit.

Abstract: An energy storage system, a method for cell inspection by the energy storage system, and an energy storage station are provided. The energy storage system includes a PCS and at least one battery cluster. The battery cluster includes multiple cells. The method includes: sending an inspection command to instruct the PCS to regulate power, upon receipt of a cell inspection command; determining a current signal of the battery cluster; and for each of the plurality of cells, determining a voltage signal of the cell, calculating an impedance of the cell based on the current signal and the voltage signal, and determining based on the impedance whether the cell malfunctions. Therefore, aging of the cells can be known to protect other cells from being affected by a malfunctioning cell, thereby improving reliability. Further, all the cells can be inspected simultaneously, and therefore any malfunctioning cell can be rapidly detected.

Abstract: A method for processing arc fault, an inverter and a photovoltaic system are provided in the present disclosure. The method includes: after an inverter detects suspected arc, stopping outputting a control signal to a first DC/DC conversion circuit where suspected arc occurs, and maintaining remaining DC/DC conversion circuits operating normally; waiting for a first preset period, determining whether a current at the power supply side of the first DC/DC conversion circuit is less than a first preset current; determining that arc fault occurs, in a case that the current at the power supply side is less than the first preset current.

Abstract: A method and a device for locating a fault are provided. The method is applied to an energy storage system, which includes a first battery module, a second battery module, a sensor, and a PCS. A first branch where the first battery module is arranged and a second branch where the second battery module is arranged are connected in parallel and are electrically connected to the sensor. The PCS is electrically connected to the first and the second battery modules. The method includes: switching the first and second branches to a target state and acquiring a second signal sensed by the sensor in the target state, in response to a first signal sensed by the sensor meeting a first preset condition; locating the fault according to the first signal and the second signal; and disconnecting a branch where the fault is located.

Abstract: The present application relates to a hydrogen production system, and a thermal management method and apparatus therefor. The hydrogen production system includes: at least two electrolytic cells; and a post-treatment device, the at least two electrolytic cells sharing the post-treatment device, and the post-treatment device including first electrolyte inflow branch pipes and second electrolyte inflow branch pipes, wherein the first electrolyte inflow branch pipes share a single cooling apparatus and are used for guiding a cold electrolyte into a corresponding electrolytic cell, and the second electrolyte inflow branch pipes are bypass branch pipes of the cooling apparatus and are used for guiding a hot electrolyte into a corresponding electrolytic cell. Compared with the prior art, embodiments of the present invention implement accurate control on the temperature of each electrolytic cell and improve system efficiency.

Abstract: A method and a device for detecting arcing in an energy storage system, and an energy storage system are provided. The method includes: detecting an arcing feature in current of varying frequencies through a direct current bus of a power conversion system (PCS) unit, where the PCS unit is arranged in a PCS in the energy storage system; detecting a sudden change in port voltage of the PCS unit, in response to success in detecting the arcing feature; and determining that an electric arc occurs in a circuit where the PCS unit is arranged, in response to success in detecting the sudden change.

Abstract: A bearing device of a floating power station includes a supporting component and operation and maintenance passages formed by multiple operation and maintenance floating bodies arranged in sequence. Two adjacent rows of the operation and maintenance passages are connected by the supporting component, and an electrical device mounting position for mounting an electrical device is provided on the supporting component. In the bearing device for the floating power station provided according to the present application, the two adjacent rows of the operation and maintenance passages are connected by the supporting component, and the electrical device is mounted on the electrical device mounting position of the supporting component, that is, the mounting of the electrical device is not affected by a space between the two adjacent operation and maintenance passages, thereby the versatility of the bearing device provided according to the present application is improved.