IEC 63349 series documents establish requirements for photovoltaic direct-driven appliance (PVDDA) controllers. The requirements are applicable to systems with voltages not higher than 1500V DC or 1000V AC, and where the output power of variable frequency drive (VFD) not higher than 30kW.
PVDDA controllers are devices used for transforming, regulating and controlling power among sources (such as PV array, grid, energy storage, etc.) and appliance loads (such as air-conditioner, refrigerator, water pump, etc.). Through a PVDDA controller, power generated by PV system is directly applied to the load, with or without a connection to the grid. PVDDA controllers shall communicate with connected power converters and power sources, but communication protocols are not covered in this document.
A PVDDA controller may be connected to multiple power converters such as: a Maximum Power Point Tracking (MPPT) system, a VFD, a bi-directional grid-connected AC/DC power converter, an energy storage charger/discharger, and converters for DC or AC appliances, etc. However, many of these devices have their own applicable standards, therefore this document does not intend to create any new requirements for these devices. Instead, it covers the control functions and the operational performance between the controller and these power converters.
Safety requirements of the PVDDA controller are not covered by this document. Safety requirements of power converters connected to the PVDDA controller are listed as follows:
a) converter connected to PV array, IEC 62109-1 and IEC 62109-2 is applicable;
b) bi-directional converter connected to grid, IEC 62909-1 and IEC 62909-2 is applicable;
c) converter connected to energy storage, IEC 62509 is applicable;
d) variable frequency drive, IEC 60730-1 is applicable.
Characterization and testing of the PVDDA controller’s efficiency are not included in the scope of this part of the document. They will be included in part 3 of this document (under development).
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