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1. 发明公开

EP4386400A1 PHOTOVOLTAIC SYSTEM, RELAY DETECTION METHOD, AND POWER SOURCE SYSTEM 审中-实审
公开(公告)号：EP4386400A1
公开(公告)日：2024-06-19
申请号：EP21957064.5
申请日：2021-09-16
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： LU, Li , XIN, Kai , YU, Xinyu , LIU, Yunfeng
IPC分类号： G01R31/327 , H02J3/38
CPC分类号： Y02E10/56 , H02J3/38 , G01R31/327 , H02H7/12 , H02H3/05
摘要： This application discloses a photovoltaic system, a relay detection method, and a power supply system. The photovoltaic system includes an inverter, a filter capacitor, a relay, and a controller. The filter capacitor is connected to an output of the inverter, and the relay is connected between the output of the inverter and an alternating current grid. When a fault, for example, sticking of the relay is detected, the controller stops sending a PWM driver gating signal to the inverter, and stops driving of a switch transistor in the inverter, and the inverter stops outputting power, and then determines whether a voltage difference between two ends of the relay is greater than a preset value, to determine whether the relay is faulty. When the relay is faulty, fault alarm information is sent. The controller stops sending the PWM driver gating signal to the inverter only within a preset phase range of a voltage of the filter capacitor, to ensure that the voltage of the filter capacitor has a large value. The voltage of the filter capacitor is equal to an alternating current grid side. Because the voltage of the filter capacitor is large, an alternating current grid-to-ground voltage is pulled up, to avoid detecting the fault as an alternating current grid-to-ground short circuit, so that the fault of the relay is accurately detected.

2. 发明公开

EP4346078A1 PHOTOVOLTAIC SYSTEM, FAST TURN-OFF METHOD, AND PHOTOVOLTAIC INVERTER 审中-实审
公开(公告)号：EP4346078A1
公开(公告)日：2024-04-03
申请号：EP21947528.2
申请日：2021-06-30
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： LU, Li , XIN, Kai , YU, Xinyu , YANG, Boping
IPC分类号： H02M7/42 , H02H7/22 , H02S40/30
摘要： This application discloses a photovoltaic system, a fast shutdown method, and a photovoltaic inverter. The system includes an inverter, a fan, and a controller. A photovoltaic string and a direct current bus capacitor are connected between a positive input end and negative input end of the inverter. The controller receives a fast shutdown instruction, and sends a drive signal to a switching transistor in the inverter, so that the switching transistor performs a switching action under the action of the drive signal, and the switching transistor consumes electric energy during the switching action; or the controller turns on the fan after receiving the fast shutdown instruction, to consume electric energy by using the fan; or the controller may send the drive signal to the switching transistor and also control the fan to be turned on, so that both the switching transistor and the fan consume electric energy. In the photovoltaic system provided in embodiments of this application, with no additional hardware circuit added, a discharge speed of the direct current bus capacitor is increased, so that reduction of a direct current bus voltage is accelerated, thereby ensuring that electricity stored in the direct current bus capacitor is released in a timely manner during fast shutdown of the photovoltaic system, to meet a standard requirement for fast shutdown.

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