Fault recovery controller for integrated solar pv system

A method of providing reactive power support to a radial distribution network, comprising:

• connecting a first end radial distribution transmission line to a grid transformer;
• connecting a plurality of loads in parallel to the radial distribution transmission line;
• installing a photovoltaic module;
• connecting a solar power inverter in parallel with the photovoltaic module;
• connecting an output terminal of the solar power inverter to a point of common coupling at a second end of the radial distribution transmission line;
• connecting an inverter controller to the solar power inverter;
• measuring, with a voltmeter, a voltage at the point of common coupling;
• receiving, by the inverter controller, the voltage measured at the point of common coupling and a voltage reference value;
• and
• generating, by the inverter controller, gate control signals configured to switch a set of transistor gates of the solar power inverter to operate at less than or greater than a unity power factor to provide reactive power to or to absorb reactive power at the point of common coupling respectively when the voltage measured at the point of common coupling is less than or greater than the voltage reference value due to a three-phase to ground fault on a load bus connected to one of the loads.

A method of providing reactive power support by a photovoltaic module to a grid connected radial distribution network connected to a plurality of load buses, comprising:

• installing a photovoltaic module;
• connecting a solar power inverter in parallel with the photovoltaic module;
• connecting an output terminal of the solar power inverter to a point of common coupling of the radial distribution transmission line;
• connecting an inverter controller to the solar power inverter;
• measuring, with a voltmeter, a voltage at the point of common coupling;
• receiving, by the inverter controller, the voltage measured at the point of common coupling and a voltage reference value;
• and
• generating, by the inverter controller, gate control signals configured to switch a set of transistor gates of the solar power inverter to operate at less than or greater than a unity power factor to provide reactive power to or to absorb reactive power at the point of common coupling respectively when the voltage measured at the point of common coupling is less than or greater than the voltage reference value due to a three-phase to ground fault on a load bus connected to one of the loads.