Page 6 of 190 Report No.: 6068396.50 Name and address of factory (ies) : 1. Sungrow Power Supply Co., Ltd. No.1699 Xiyou Rd., New & High Technology Industrial Development Zone, Hefei 230088 P.R. China 2. Sungrow Power Supply Co., Ltd. No. 608 Changning Avenue, New & High Technology Industrial Development Zone, Hefei 230088 P.R. China 3. Sungrow Developers (India) Private Limited No. 85, Kaniminike village, Kengeri hobli Bangalore South Taluk, 560074 Bangalore, India General product information: The product is a transformerless three-phase PV grid-connected inverter, is an integral component in the PV power system.
The inverter is designed to convert the direct current power generated from the PV modules into grid-compatible AC current and feeds the AC current to the utility grid. The unit is providing EMC filtering at the input and output towards mains. The output was switched off redundant by the high power switching bridge and two relays in series. This assures that the opening of the output circuit will also operate in case of one error. Block Diagram: Description of the electrical circuit and functional safety (redundancy control): The PCE is meanwhile controlled by a master DSP and a slave ARM to ensure there is no hazard even when a fault occurs on one of chips.
There are two groups of power relays in series installed on the mains side to separate the energy from dc side while the PCE cease energizing. One group relays controlled by the master DSP and another controlled by slave ARM. The master DSP handles main control process like voltage/current sampling, PWM, ISO detection, grid protection and so on. The slave ARM runs as a backup of some critical protective functions, like voltage sampling, grid protection, temp monitoring, and GFCI detection and so on. The PCE is equipped with RS485 ports on communication board and PLC communication, which is reinforced, separated from main circuits.
Interface relays disconnect the equipment from utility in case any one of following grid faults occurred: 1. PV array insulation resistance fault 2. Residual current fault 3. Over & under grid voltage 4. Over & under grid frequency 5. Islanding operation 6. Over DC injection current TRF No. G99/1-4_V1.0