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STEVAL-ISV003V1 Datasheet(PDF) 1 Page - STMicroelectronics |
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STEVAL-ISV003V1 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 12 page Data brief For further information contact your local STMicroelectronics sales office. October 2011 Doc ID 022334 Rev 2 1/12 12 STEVAL-ISV003V1 250 W microinverter for plug-in PV panels demonstration board Features ■ Input voltage range from 18 V to 45 V ■ Output voltage range from 110 V to 240 V AC, 50/60 Hz ■ Grid connection algorithm and MPPT capability ■ Digital control section managed by the STM32 ■ Reactive power management ■ RS-232 for communication ■ RoHS compliant Description The STEVAL-ISV003V1 is a demonstration board which implements the microinverter concept and is designed to optimize the power production of each single solar panel by means of DC/AC conversion. The conversion system is capable of both grid synchronization and Maximum Power Point Tracking (MPPT) thanks to the use of an advanced control algorithm implemented in the 32-bit STM32 microcontroller. The MPPT function is based on the perturb and observe (P & O) concept which seeks the best operating point of the panel, thus maximizing the energy produced under any environmental condition. The grid synchronization algorithm has the advantage over standard solutions of a decoupled control of active and reactive power. The STEVAL- ISV003V1 demonstration board uses a high- frequency (HF) isolated DC/DC converter with interleaved current and an optimized full-bridge DC/AC inverter. The typical solar panel voltage is first stepped up to about 400 V and then converted into AC to create a sinusoidal output. An LED display provides a user-friendly interface for the end user which allows monitoring and/or modifying some of the main operating parameters. Two modes of operation are available and can be selected to allow either open-loop operation or closed-loop operation in synchronization with the grid. In open-loop mode the sinusoidal reference is created internally by means of a standard lookup table, while in closed-loop mode, a sinusoidal voltage feedback, proportional to the grid voltage, is used. The system can be connected to either a 50 Hz or 60 Hz network, depending on local requirements. Finally, the RS-232 interface can be used for serial data transfer of specified voltage, current and current signals. STEVAL-ISV003V1 www.st.com |
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