STEVAL-ISV003V2

STEVAL-ISV003V2 250 W microinverter for plug-in PV panels (60 Hz version) Data brief Features • • • • • • Input voltage range from 18 V to 45 V Output voltage range from 110 V to 240 V AC, 60 Hz Grid connection algorithm and MPPT capability Digital control section managed by the STM32 RS-232 for communication RoHS compliant Description The STEVAL-ISV003V2 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 April 2014 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 on a 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 in every environmental condition. The grid synchronization algorithm has the advantage over standard solutions of a decoupled control of active and reactive power. The STEVALISV003V2 demonstration board uses a highfrequency (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 and allows monitoring and/or modifying some of the main operating parameters. Two modes of operation are available and can be selected for the STEVALISV003V2 to allow either open-loop or closedloop 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 gird voltage is used. Finally, the RS-232 interface can be used for serial data transfer of specified voltage, current, and current signals. DocID025856 Rev 1 For further information contact your local STMicroelectronics sales office 1/4 www.st.com Schematic 1 STEVAL-ISV003V2 Schematic Figure 1: STEVAL-ISV003V2 2/4 DocID025856 Rev 1 STEVAL-ISV003V2 2 Revision history Revision history Table 1: Document revision history Date Revision 15-Apr-2014 1 DocID025856 Rev 1 Changes Initial release. 3/4 STEVAL-ISV003V2 Please Read Carefully Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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