Apparatus and method for dynamic voltage restoration of utility distribution networks

A method of compensating for changes in the voltage delivered to a distribution line, said changes being introduced by disturbances in a utility network to which said line is connected, said line having a source end connected to receive a source voltage signal from said utility network and a load end connected to an electric load, comprising:

• dynamically injecting a voltage signal into said line in series with said source voltage so as to compensate for any voltage variation due to a disturbance;
• developing a signal representative of real power delivered to said line by said injected signal;
• and
• adjusting said injected signal as a function of the real power delivered by said injected signal to said line.

A system for compensating for disturbances in a power distribution line, said lien receiving a source voltage signal from a utility source at a source end and delivering an end voltage signal at a load end of said line, said system comprising:

• a source of energy for delivering power during line disturbances;
• voltage generator means operatively connected to said energy source and controllable for dynamically generating a signal for injection into said line so as to deliver power to said line and correct for disturbances to said source voltage signal;
• an injection circuit for injecting said dynamically generated signal into said line between said source end and said load end;
• and
• controller means for controlling said voltage generator means, said controller means having control signal means for generating control signals as a function of the voltage signal delivered by the line to said load end and of the real power delivered by said injection circuit into said line.