Huawei Digital Power Technologies Co., Ltd.

Huawei Technologies Co., Limited

Tencent Technology (shenzhen) Company Limited

Xi'an Zhongxing New Software Co., Ltd.

Peng Dong

Kai Xin

Xinyu Yu

Hui Zhang

Li Qin Shen

Jing Zhang

Lei Han

Yanzhong Zhang

Yongbing Gao

Hong Fei Zhou

Jie Hou

Heyang Liu

Xiaofei Xu

Nian Liu

Chen Zhang

Jun Ye

Junjie Li

Danzhi Chen

Jun Tao

Meina Li

Fuqiang Xu

Qunli Ma

Yufei Liu

Yubin Li

Xi Yu Xu

Mingquan Zhao

Guanghao Shao

Junjie Niu

A power converter control method includes: determining a phase angle difference between a phase angle of a voltage output by the power converter and a phase angle of a power grid voltage; and if the phase angle difference is greater than or equal to a first angle threshold, setting a d-axis current reference value and a q-axis current reference value that are used to determine a modulation voltage of the power converter to preset fixed values; calculating a first modulation voltage of the power converter based on the d-axis current reference value, the q-axis current reference value, and a power grid current; calculating a compensation voltage of the power converter based on a preset virtual resistance parameter and the power grid current; and using a sum of the first modulation voltage and the compensation voltage as a total modulation voltage.

Power convertor control method, control apparatus, and computer storage medium

This application discloses a photovoltaic system and a carrier wave signal synchronization method. The photovoltaic system includes a plurality of inverters and a controller. Each inverter in the photovoltaic system inverts a direct current into an alternating current based on a received carrier wave signal, and transmits the alternating current to a power grid. The controller obtains first output currents of the plurality of inverters in an adjustment period, so that the controller can obtain first output current valid values of the plurality of inverters based on the first output currents of the plurality of inverters.

Photovoltaic system and carrier wave signal synchronization method

A power line communication (PLC) system includes a PLC signal transmitting end, a PLC signal receiving end, and a power electronic apparatus. The PLC signal transmitting end is connected to the PLC signal receiving end through a power line, and the power electronic apparatus is connected to the power line. The power electronic apparatus is configured to increase output impedance in a first PLC communication frequency band, to reduce interference from an output current of the power electronic apparatus to a PLC signal in the first PLC communication frequency band. The first PLC communication frequency band is a PLC communication frequency band in which the PLC signal transmitting end sends the PLC signal to the PLC signal receiving end. In this way, the interference from the power electronic apparatus to the PLC signal in the first PLC communication frequency band can be reduced without adding an additional passive filter.

Power line communication system, power electronic apparatus, and interference suppression method

An example system includes an inverter and at least one combiner box. The combiner box includes a plurality of direct current-direct current (DC-DC) circuits and one controller. The controller is configured to: when an output voltage of the combiner box is greater than or equal to a first preset voltage and less than or equal to a second preset voltage, control the combiner box to output a maximum power. When the output voltage of the combiner box is greater than the second preset voltage, the controller controls an output power of the combiner box to decrease as the output voltage increases. The second preset voltage is greater than the first preset voltage, and the maximum power is a sum of maximum powers of all photovoltaic strings connected to the combiner box.

Photovoltaic power generation system, power control method, and combiner box

A common-mode voltage injection control method and apparatus for an inverter. For the method and apparatus, a common-mode voltage for a DPWM mode is calculated based on three-phase port voltages and an output power command; a common-mode voltage for an MPC modulation mode is calculated based on the direct current bus voltage, the three-phase port voltages, and the output power command; a modulation proportion is determined based on a maximum phase voltage peak value of the three-phase port voltages, the direct current bus voltage, and a power factor of the output power command; and a common-mode injection voltage is generated based on the common-mode voltage for the DPWM mode, the modulation proportion, and the common-mode voltage for the MPC modulation mode.

Common-mode voltage injection control method and apparatus for inverter

A communication method includes a first network device that receives a service packet from a first endpoint device, where a destination media access control (MAC) address of the service packet is a specific local MAC address of a second endpoint device, the specific local MAC address includes an indication prefix and location information, the indication prefix indicates that the specific local MAC address includes the location information, and the location information indicates an access location of an endpoint device in a network. The first network device determines an egress port from a preset routing table based on the location information in the specific local MAC address of the second endpoint device, and sends the service packet through the egress port, where the routing table includes the location information and the egress port corresponding to the location information.

Communication method and apparatus

Signal sending method and apparatus. The signal sending method includes: sending, by a first apparatus, an optical signal to a second apparatus in a slot before a first wavelength slot; sending, by the first apparatus, a first optical signal to the second apparatus in the first wavelength slot; and sending, by the first apparatus, an optical signal to a second apparatus in the slot after the first wavelength slot. A wavelength of the first optical signal is a first wavelength. The first optical signal sent by the first apparatus in one first wavelength slot is used to carry first wavelength data on one symbol. Wavelengths of the optical signals sent by the first apparatus in the slots before and after the first wavelength slot are wavelengths other than the first wavelength.

Signal sending method and apparatus

A forwarding path selection method and device are disclosed. If a data packet to be sent to a target device is a start packet of a flowlet in which the data packet is located, a sender device selects a low-load path from a plurality of paths to forward the data packet, and sets a forwarding decision of a flow in which the data packet is located to the selected path, where load of each path is load of traffic received by a corresponding intermediate device from the sender device or load of traffic sent by a corresponding intermediate device to the target device, whichever is higher. Flowlet-based load balancing can be implemented only by providing related functions on one type of device.

Forwarding path selection method and device

An encoding modulation method and transmitter are described. The method includes: oversampling and noise-shaping received multi-bit data to obtain N bits of data; using the N bits of data as a lookup table address to obtain a PWM puke modulation signal; multiplexing synthetic orthogonal (IQ) complex data of the PWM pulse modulation signal to be real number signal data; and converting the multiplexed real number signal data to an analog signal for power amplification and output, N being an integer representing a smaller number of bits than the received multi-bit data.

Encoding modulation method and transmitter

The present disclosure relates to a method for displaying splash screen content, a terminal, a content server, and a system therefor. The method includes: receiving a content request sent by a terminal, the content request carrying first time and/or a geographical location of the terminal, the first time being time when the terminal last requests splash screen content; acquiring splash screen content according to the first time and/or the geographical location of the terminal; and sending the splash screen content to the terminal such that the terminal displays the splash screen content. The content server includes: a first receiving module, a first acquiring module, and a first sending module. The terminal includes: a second sending module, a second receiving module, and a display module. The system includes: a terminal and a content server. The present disclosure enhances personality and interest of a terminal product and improves user experience.

Method for displaying splash screen content, terminal, content server, and system therefor

A method for inter-network communication between a first and second user. The method includes receiving a first request for a location associated with the second user from a first switching system for a first network in response to a second request. The method processes information associated with the first request and determines a network identifier for a second network related to the location associated with the second user, and sends the first switching system a location message, including the network identifier for the second network. The method includes receiving a third request for routing information associated with the second user from a second switching system for the second network. The method determines a location directory in the second network for the second user and receives the roaming information for the second user from the location directory. The method then sends the roaming information to the second switching system.

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Shenzhen, China

Peng Dong