Sungrow Power Supply Co., Ltd.

Hefei Yiwuyizheng Technology Co., Ltd.

Xinyu Wang

Jun Xu

Yanfei Yu

Yilei Gu

Jiacai Zhuang

Xiaoxun Li

Anying Jiang

Yu Yang

Yu Gu

Tao Zhao

Zongjun Yang

Nianan Pan

Qiaodi Chen

Renxian Cao

Fushuai Zhuang

Li Zhao

Guoqing Cai

Yuqing Cui

Yuan Zhuang

Xiaohui Luo

Chaoxuan Zhang

Deyong Zhao

Shun Ding

Mingda Wang

Cai Jiang

Yayun He

Rong Zhang

Dong Chu

An MLPE photovoltaic system and an MLPE device detection method thereof. An output end of each MLPE device is connected to a corresponding bus in the MLPE photovoltaic system, and each MLPE device has its own positioning number. The method includes detection operation which is executed at least once, and the detection operation includes: controlling an MLPE device having a corresponding positioning number to perform operation state switching, and acquiring operation characteristics of a corresponding bus before and after switching; determining whether the change of the operation characteristics satisfies a preset change condition; and if not, determining that the state of the MLPE device having the corresponding positioning number is abnormal.

MLPE photovoltaic system and MLPE device detection method thereof

A photovoltaic assembly turnoff device, and a photovoltaic system. The rapid turnoff method includes: after receiving a start signal, a photovoltaic assembly turnoff device controls itself to be turned on, so that a photovoltaic assembly connected thereto achieves electric energy output; then, the photovoltaic assembly turnoff device can measure a state parameter thereof to determine whether a corresponding inverter channel in a photovoltaic system has a fault; if the corresponding inverter channel in the photovoltaic system has the fault, control the photovoltaic assembly turnoff device to be turned off, so that the photovoltaic assembly connected thereto stops the electric energy output; if the corresponding inverter channel in the photovoltaic system has no fault, always keep the photovoltaic assembly turnoff device to be turned on.

Rapid turnoff method, photovoltaic assembly turnoff device, and photovoltaic system

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.

Photovoltaic system and communication method therefor

The present invention relates to the technical field of block chains, and discloses a data security management method, system and storage medium for smart contract based on block chain network, comprising storing information of at least one public key in asymmetric public and private keys synchronously when generating the smart contract; triggering a data management request, establishing block chain network communication, calling the smart contract to generate validation data, rendering timeliness management to the validation data, sending the same to a data management request end and calling at least one private key, signing the validation data, reorganizing the same with data to be managed and making corresponding management operations; data modifications caused by malicious attacks to data in the contract due to disclosure of the contract or other security defects are addressed, safety of data in the chains is efficiently promised and the present invention is of realistic utility value.

Data security management method, system and storage medium for smart contract based on block chain network

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.

Method of ranking MLPE apparatuses and locating devices in a photovoltaic string

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.

Bridge cascade system

A photovoltaic inverter, a photovoltaic system, and a method for controlling discharging are provided. The photovoltaic inverter includes a first DCDC converter, an inverter circuit, a first discharging circuit, and a controller. A port capacitor is connected between a positive input end and a negative input end of the first DCDC converter. The port capacitor includes an X capacitor and a first group of Y capacitors. The first discharging circuit is connected between a common terminal of the first group of Y capacitors and a direct current bus, where the common terminal of the first group of Y capacitors is grounded. The controller is configured to control, when receiving a rapid shutdown instruction, the first discharging circuit to operate. The first discharging circuit is configured to discharge electrical energy of the port capacitor.

Photovoltaic inverter, photovoltaic system, and method for controlling discharging

A photovoltaic system and a method for locating devices in a photovoltaic string. A communication host in the photovoltaic system acquires accumulated operation durations of MLPE apparatuses of the photovoltaic string, ranks the accumulated operation durations to obtain a ranking result, and determines a physical location of each device in the photovoltaic string according to the ranking result and a sequence of installing positions of the devices, where the devices are installed at the installing positions based on the sequence. It is not necessary to paste label codes on the MLPE apparatuses, or record serial numbers of the MLPE apparatuses by installation personnel. Operation processes are simplified, operation time is saved, and labor costs are reduced.

Photovoltaic system and method for locating devices in photovoltaic string

A two-stage converter, a method for starting the two-stage converter, an LLC converter, and an application system are provided. A controller of the LLC converter of the two-stage converter first controls a main circuit of the LLC converter to perform hiccup charging on a direct current bus of a later-stage converter at a preset interval, so that the direct current bus voltage of the later-stage converter gradually increases, until an auxiliary power supply of the later-stage converter starts to operate, to supply power to the controller of the later-stage converter. After the controller of the later-stage converter reports the detected direct current bus voltage, the controller of the LLC converter determines whether the output voltage of the LLC converter increases to a hiccup starting voltage. If so, the controller of the LLC converter controls the main circuit to operate in a hiccup voltage stabilization phase.

Two-stage converter and method for starting the same, LLC converter, and application system

A photovoltaic solid-state transformer, a photovoltaic inverter system and a bidirectional high-voltage transformer are provided. The photovoltaic solid-state transformer includes: multiple single phase modules and a filter. Each of the single phase modules includes multiple multiple-output isolated DC/DC converters and multiple cascade DC/AC modules, where each of the multiple-output isolated DC/DC converters includes a DC/AC module, a high frequency transformer and multiple AC/DC modules. The multiple single phase modules are connected to the grid via the filter in a star connection or a delta connection. The DC/DC converters and the cascade DC/AC modules are simple logical switches and have conversion efficiency higher than 99%, such that the photovoltaic solid-state transformer has a reduced volume, and an improved overall efficiency higher than 98.5%.

Photovoltaic solid-state transformer, photovoltaic inverter system and bidirectional high-voltage converter

A medium and high voltage energy conversion system is provided. An input terminal of each of high-voltage isolated DC/DC converters in a phase circuit of the system is connected to a common DC bus. Each of the high-voltage isolated DC/DC converters converts, based on an open-loop control strategy or a closed-loop control strategy, a DC input voltage of a cascade module connected to the high-voltage isolated DC/DC converter into an instruction value related to a voltage of the common DC bus. A system controller of the system calculates, based on at least a voltage-current double loop control strategy, a three-phase modulation instruction to be sent to the cascade modules in three phases according to a parameter related to the voltage of the common DC bus, to implement grid-connected control on three phase circuits.

Medium and high voltage energy conversion system

A medium-high voltage photovoltaic (PV) power generation system is provided. A PV string of the system is insulated from the ground via an insulator of a medium-high voltage withstanding level, so that the PV string is applicable under a high voltage level. The PV strings are connected to cascade modules. An output voltage of series-connected cascade modules is grid-connected to a 10 kV power grid through a three-phase filter, without a power booster transformer or a high-frequency isolated DC/DC converter in a conventional power station, thereby improving the system efficiency.

Medium-high voltage photovoltaic power generation system

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.

Method and apparatus for controlling alternating current cascade photovoltaic power generation system

A control apparatus and a combiner box are provided. In a case that component maintenance needs to be performed, an optimizer connected to the combiner box is controlled to operate in a safe mode, and a switch-off signal is outputted to disconnect the combiner box from an inverter if an output current of the combiner box is smaller than a threshold. In a case that the maintenance is completed, the optimizer connected to the combiner box is controlled to operate in a maximum power point tracking mode, and the combiner box is connected to the inverter if an input voltage of the combiner box is greater than an output voltage of the combiner box, that is, if an output voltage of a corresponding string increases gradually to a value exceeding a direct current bus voltage.

Control apparatus and combiner box

An ANPC inverter, a zero-crossing switching method and a zero-crossing switching apparatus of the ANPC inverter are provided. The method includes: controlling switch states of switch devices in a bridge leg to change according to a preset logic when zero-crossing switching occurs in an output voltage instruction of the bridge leg, so as to prevent overvoltage in the switch device in the bridge leg. The preset logic includes switching among a sequence of switch state combinations. Switch state combinations of the switch devices before and after the zero-crossing switching occurs are defined as the first and second switch state combinations of the sequence. The second to the penultimate switch state combinations are all safe switch state combinations selected in advance, in each of which a maximum voltage borne by the switch devices in the bridge leg is clamped to a safe limit value.

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Anhui, China

Xinyu Wang