Interconnection system for transmitting power between electrical systems

A substation for electrically interconnecting a first electrical system and to a second electrical system, the first electrical system and the second electrical system having a differing electrical characteristic, the substation comprising:

• a step-down transformer coupled to the first electrical system;
• a step-up transformer coupled to the second electrical system;
• a rotary transformer coupled to the step-down transformer and to the step-up transformer, the rotary transformer comprising:
• a rotor connected to a first of the step-down and step-up transformers;
• a stator connected to a second of the step-down and step-up transformers;
• a controller which adjusts an angular position of the rotary transformer so that a predetermined power is transferred from the first electrical system to the second electrical system, the controller comprising:
• a first control unit which compares an input order power signal P0 to a measured power signal P1 being transferred between the first electrical system and the second electrical system to generate a requested angular velocity signal ω0;
• a second control unit which compares the requested angular velocity signal ω0 to a measured angular velocity signal ωr of the rotary transformer to generate a drive signal T0.

An electrical interconnection system comprising:

• a rotary transformer for coupling to a first electrical system and to a second electrical system, the rotary transformer comprising:
• a rotor connected to the first electrical system;
• a stator connected to the second electrical system;
• a closed loop angular positioning control system which operates the rotary transformer for transferring power from the first electrical system to the second electrical system in response to a comparison between an input order power signal P0 and a measured power signal P1 being transferred between the first electrical system and the second electrical system.

A method of interconnecting two electrical systems, the method comprising:

• coupling a rotor of a rotary transformer to a first electrical system and a stator of the rotary transformer to a second electrical system;
• comparing an input order power signal P0 and a measured power signal P1 being transferred between the first electrical system and the second electrical system to generate a requested angular velocity signal ω0;
• and
• adjusting an angular position of the rotary transformer so that a predetermined power is transferred from the first electrical system to the second electrical system, the adjusting being performed by a closed loop angular positioning control system which operates the rotary transformer for transferring power from the first electrical system to the second electrical system.