Photovoltaic module control method and system

The invention provides a photovoltaic module control method and system which can simultaneously control at least one photovoltaic module. The control method for any photovoltaic module comprises: collecting wind speed information, vertical shadow information, horizontal shadow information and output power information at the position where a photovoltaic module is located, and sending collected information to a PLC; determining a braking control signal according to the wind speed information, a vertical turning signal according to the vertical shadow information, a horizontal turning signal according to the horizontal shadow information, and a cleaning signal according to the output power information; controlling the opening and closing of a turning breaker according to the braking control signal; and when the turning breaker is closed, performing turning light tracing control in a vertical direction according to the vertical turning signal, performing turning light tracing control in a horizontal direction according to the horizontal turning signal, and performing cleaning control on the photovoltaic module according to the cleaning signal. The photovoltaic module control method and system can improve the output power of photovoltaic modules to a greater degree.