This part of IEC 63349 establishes control functions and operational performance requirements for photovoltaic direct-driven appliance (PVDDA) controllers.

PVDDA controllers are devices used for controlling power among power sources (such as a PV array, grid, energy storage, etc.) and appliances (such as an air-conditioner, refrigerator, water pump, etc.). Through a PVDDA controller, the power generated by a PV array is directly supplied to appliances. The PVDDA controller also controls the appliances and has internal communication. The PVDDA controller can have external communication with connected power sources and appliances, but communication protocols are not covered in this document.

A PVDDA controller is built in or integrated with a control center, a maximum power point tracking (MPPT) system, and one or multiple converters connected to appliances. The controller can also include a bi-directional grid-connected AC/DC power converter, an energy storage charger/discharger, etc. However, many of these devices have their own applicable standards, therefore this document does not intend to create any new requirements for these individual devices.

The requirements for PVDDA controllers are applicable to systems with voltages not higher than 1 500V DC or 1 000V AC. Safety and EMC requirements for the PVDDA controllers are under consideration and not covered by this document. Safety requirements for power converters connected to a PVDDA controller are listed as follows:

a) for converter connected to PV array, IEC 62109-1 and IEC 62109-2 are applicable;
b) for bi-directional converter connected to grid, IEC 62909-1 and IEC 62909-2 are applicable;
c) for converter connected to energy storage, IEC 62477-1 and IEC 62509 are applicable;
d) for variable frequency drive, IEC 61800-5-1 is applicable.

Performance requirements for each individual power converter connected to a PVDDA controller refer to IEC 62093.

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