Abstract: An energy storage system and a switching power supply thereof are provided in the present disclosure. An alternating current AC input terminal of the switching power supply is connected to an AC power source via a protection fuse unit. A direct current DC input terminal of the switching power supply is connected to an energy storage unit in the energy storage system via a protection fuse unit. An output terminal of the switching power supply is connected to a master control unit in the energy storage system and an additional load in the energy storage system. Therefore, the switching power supply can receive electric energy from at least one of the energy storage unit and the AC power source, and supply power to the master control unit and the additional load in the energy storage system.

Abstract: An inverter and a heat radiation structure thereof are provided. The heat radiation structure of the inverter includes a heat radiator for radiating heat from a heating element of the inverter, and a heat radiation fan for air-cooling the heat radiator. The heat radiator includes multiple heat radiation fins able to be air-cooled. The number of the heat radiator is at least two, and two adjacent heat radiators are a first heat radiator and a second heat radiator respectively. The heat radiation fan is provided between the first heat radiator and the second heat radiator, and the heat radiation fan is located on the tops of the heat radiation fins. In the heat radiation structure of the inverter, the heat radiation fan is capable of cooling the first heat radiator and the second heat radiator at the same time.

Abstract: Provided in the present invention are a battery cluster and an energy storage system, which are applied to the technical field of energy storage. The battery cluster comprises a plurality of battery packs and at least one first fuse, wherein each battery pack is connected to each first fuse in series, so as to form a series branch, and the obtained series branch is connected to a switch box provided with a second fuse. By means of the battery cluster provided in the present invention, at least one first fuse is connected in series in the battery cluster, and the first fuse matches a second fuse in a switch box, so as to realize dual protection; and when the second fuse in the switch box fails, protection can be realized depending on the first fuse, such that the fuse protection reliability is effectively improved, and the safe operation of the battery cluster and the energy storage system is ensured.

Abstract: An energy storage apparatus is provided. The energy storage apparatus includes: a support structure, which is provided with at least one support layer in a height direction of the support structure; an energy storage device, an air outlet is defined at the top of the energy storage device, and an air inlet is defined on a sidewall of the energy storage device, where the number of the energy storage device is at least two, the energy storage devices are arranged in at least two layers through the support layer, and the support layer between adjacent layers of energy storage devices is hollowed out or configured in a partitioning manner; and an air guide structure mounted on the energy storage device and in communication with an air inlet of the energy storage device.

Abstract: A start method for a photovoltaic rapid shutdown system, an application apparatus and a system. In the method, an inverter system controls the voltage change of a corresponding direct current bus in a photovoltaic rapid shutdown system; and a photovoltaic module shutdown device performs determination according to a measured output voltage of itself, and controls itself to be turned on when the change characteristic of the voltage of the direct current bus connected to itself satisfies a preset turn-on condition. Therefore, merely by means of a self-contained voltage sampling device, the photovoltaic module shutdown device can determine whether a turn-on signal is received, without additionally providing a corresponding receiving device, thereby reducing hardware cost of the photovoltaic module shutdown device while realizing communication between the photovoltaic module shutdown device and the outside.

Abstract: An energy storage device and a battery cabinet are provided according to the present disclosure. The energy storage device includes a plurality of battery clusters and a high-voltage switch box. A positive input terminal of the high-voltage switch box is connected to positive electrodes of the plurality of battery clusters, a negative input terminal of the high-voltage switch box is connected to negative electrodes of the plurality of battery clusters, and an output terminal of the high-voltage switch box is configured to connect an electrical device. The high-voltage switch box is configured to control the plurality of battery clusters to be electrically connected to/disconnected from the electrical device. The cost of a battery cabinet is reduced in the present disclosure.

Abstract: An inverter, a power unit and a power module applied to the inverter are provided. The power unit includes a first package module, a second package module, and a third package module, each including two switch transistors that are complementary to each other. Since the first package module and the second package module are arranged in one half of the inner space of the power unit, and the third package module is arranged in the other half of the inner space of the power unit, the control terminal of each of the three package modules is arranged on a side of the half for arranging the package module that is away from the other half. Thus, the power unit can adopt a small-sized packaging structure without changing a layout of driver boards, thereby reducing the cost of the power unit and the inverter.

Abstract: A photovoltaic system, a method for locating devices in a photovoltaic string, a MLPE apparatus, and a method for ranking MLPE apparatuses. Each MLPE apparatus sends, actively according to a predetermine rule, an initial message to the other MLPE apparatuses. The initial message includes a serial number corresponding to said MLPE apparatus and an accumulated operation duration of said MLPE apparatus. The MLPE apparatuses determine the rank of the accumulated operation duration of each MLPE apparatus according to the initial messages sent from all MLPE apparatuses. After each MLPE apparatus communicates with a communication host, the MLPE apparatuses reports the rank of the accumulated operation duration of each MLPE apparatus to the communication host. Thereby, the communication host may determine a physical location of each device in the photovoltaic string according to the ranks of the accumulated operation durations and a sequence of installing positions of the devices in the photovoltaic string.

Abstract: The present invention provides a transformer, which is applied to the technical field of power transmission and distribution, the transformer comprising an iron core, body windings, and a semi-conductive layer, the body windings being sleeved on a core post of the iron core, and the semi-conductive layer being correspondingly provided with the body windings. Auxiliary circuits are connected to the body windings, the auxiliary circuits and preset positions of the body windings have equal potentials, and an equipotential connection point of the semi-conductive layer is provided by the auxiliary circuits. After the semi-conductive layer is connected to the auxiliary circuits, the effect of balancing the electric field distribution of a winding can be achieved.

Abstract: A cabinet air duct, a cabinet assembly and a photovoltaic inverter are provided according to the present application, where the cabinet air duct includes a cabinet and an air duct arranged in the cabinet. The cabinet is provided with an air inlet and an air outlet that are in communication with the air duct. The air inlet is arranged on a first side surface of the cabinet, the air outlet is arranged on a second side surface of the cabinet, and the first side surface and the second side surface are two opposite side surfaces of the cabinet.

Abstract: A muffler assembly and a new energy device are disclosed according to the present disclosure. The muffler assembly includes a muffler unit including a side plate and a partition plate. The side plate includes an upper side plate and a lower side plate which are oppositely arranged. The partition plate includes a first partition plate, a second partition plate and a third partition plate, the first partition plate and the third partition plate are connected to the lower side plate, the second partition plate is connected to the upper side plate and arranged between the first partition plate and the third partition plate. A first muffler channel, a second muffler channel, and a third muffler channel are formed.

Abstract: Provided is a bridge cascade system, which includes at least one phase unit and a driving unit for the phase unit. The phase unit includes N bridge topologies cascaded on alternating current AC sides. The driving unit includes one driving power supply circuit, multiple bootstrap power supply circuits and 2N driving circuits. In the phase unit, the driving circuits are powered by the driving power supply circuit directly or through corresponding bootstrap power supply circuits. The driving circuits are configured to provide driving signals for corresponding switch transistors in the phase unit. In this way, one driving power supply is matched with multiple bootstrap power supply circuits, realizing power supply to the driving circuits corresponding to the switch transistors of all bridge topologies, which reduces the difficulty in designing the driving power supply for the bridge cascade system and reduces cost for the system.

Abstract: An inverter and a method for detecting insulation impedance of the inverter are provided. During grid-connected operation of the inverter, the method includes: controlling a power supply to output two different test signals, and recording voltages of a power grid to ground corresponding to the two test signals; and calculating the insulation impedance to ground of the inverter during the grid-connected operation of the inverter according to the two test signals and the voltages of the power grid to ground corresponding to the two test signals. According to the present disclosure, the power supply outputs different test signals to disturb the voltage of the power grid to ground, so as to detect insulation impedance of the inverter during grid-connected operation of the inverter.

Abstract: An intelligent switch device and a power generation system are provided. The intelligent switch device includes a first power port, a second power port, a switch unit and a control unit. A first end of a switch unit is connected to a first power supply via a first power port, and a second end of the switch unit is connected to a second power supply via a second power port. The control unit is configured to control the switch unit to be turned on for a first time period when the first power supply is in abnormal condition, where the abnormal condition causes the switch unit to be tripped. The first time period is greater than or equal to a time period required for a device to respond to the abnormal condition.

Abstract: A module level power electronics (MLPE) photovoltaic system and a method for photovoltaic string control are provided. The method is applied to a control unit in the MLPE photovoltaic system. The control unit detects an output current of each photovoltaic string in the MLPE photovoltaic system, and then controls, for photovoltaic strings connected in parallel to a same inverter in the MLPE photovoltaic system, a voltage of a photovoltaic string with larger output current to be reduced, or controls a voltage of a photovoltaic string with smaller output current to be increased, so that backflow current can be reduced to preset range tolerable for MLPE device. The method is from a perspective of the MLPE photovoltaic system, the backflow current is limited by controlling voltage change of associated photovoltaic string without additional hardware cost, effectively protecting MLPE device in the MLPE photovoltaic system.

Abstract: A heat dissipation assembly and an electric energy conversion apparatus are disclosed according to the present application. The heat dissipation assembly comprises a side cover connected to the electric energy conversion apparatus and an air outlet cover, a heat dissipation passage is formed by enclosure of the side cover and one side surface of the electric energy conversion apparatus, the side cover is provided with an air inlet in communication with the heat dissipation passage; the air outlet cover is arranged at the top of the electric energy conversion apparatus and partially connected with the side cover, and an air outlet space is formed by enclosure of the air outlet cover, the air outlet space is in communication with the heat dissipation passage, the air outlet cover is provided with an air outlet at an outer peripheral side of the air outlet cover away from the electric energy conversion apparatus.

Abstract: A liquid replenishment and drainage device for a liquid-cooled energy storage system includes a pump, a switching power supply, a first switching valve, a check valve and a pipeline which is configured to be connected to the liquid-cooled energy storage system; the pump is arranged on the first pipeline, and the pump is electrically connected with the switching power supply; two ends of the first switching valve are respectively in communication with the first pipeline, communication positions are respectively located at two ends of the pump, and the check valve is arranged on the first pipeline and is located between the pump and the communication positions. The liquid replenishment and drainage device for the liquid-cooled energy storage system can improve the liquid replenishment and drainage efficiency of the liquid-cooled energy storage system.

Abstract: A cascaded multi-port converter and a three-phase medium-voltage input system. Input terminals of the module units are cascaded. In each module unit: input ends of the high-voltage conversion units are cascaded, a magnetic core of a multi-winding transformer is wound with multiple primary windings and at least one secondary winding, an output end of each high-voltage conversion unit is connected to a corresponding primary winding, and the secondary winding is connected to an input end of a corresponding low-voltage rectifying unit. Therefore, the windings of the multiple high-voltage conversion units share the magnetic core, and the number of the multi-winding transformers and the number of the low-voltage rectifying units can be reduced, thereby reducing the volume, weight, and costs of the cascaded multi-port converter.

Abstract: A method and a device for acquiring a charging electricity amount, and an electronic device are provided. When a controller determines based on at least operation state information of an external electric meter that the external electric meter is in a fault state, the first amount of electricity, outputted by the charging pile when the external electric meter is in the fault state, can be calculated based on at least first electric energy output data of the charging pile acquired by the charging module of the charging pile when the external electric meter is in the fault state. That is, the amount of electricity consumed by the charging pile can be calculated even when the external electric meter is in the fault state, so that the controller calculates the cost based on the amount of electricity consumed by the charging pile.

Abstract: A cascaded multi-port converter and a three-phase medium-voltage input system. Input ends of all high-voltage conversion units are cascaded between two ports of an input end of the cascaded multi-port converter. A primary winding of a multi-winding transformer is connected to an output end of a corresponding high-voltage conversion unit, and a secondary winding of the multi-winding transformer is connected to an input end of a corresponding low-voltage rectifier unit. Output ends of some of the low-voltage rectifier units are connected to each other through a bus, and the remaining low-voltage rectifier units outputs independently, such that at least one secondary winding in each multi-winding transformer is indirectly connected to the bus, and at least one multi-winding transformer is provided with at least one secondary winding that independently outputs. Therefore, power balance between various modular units is achieved, and the security of the cascaded multi-port converter is improved.