Method and apparatus for converting wind generated electricity to constant frequency electricity for a utility grid

A system of converting wind generated electricity for supplying it to a utility grid, comprising:

• a wind turbine generator having a doubly fed induction generator;
• means for generating electricity from the rotor of the generator for supplying it to the utility grid when operating at a rotational speed of the generator above synchronous speed;
• means for supplying electricity to the rotor of the generator when operating at a rotational speed below the synchronous speed of the generator and for facilitating the generation of electricity from the stator;
• means for converting the electricity from the rotor to dc electricity and converting the dc electricity to ac electricity above synchronous speed of the generator;
• means for adjusting the current of the ac electricity to or from the utility grid to be maintained in phase with the utility grid voltage;
• and
• wherein the ac electricity is maintained substantially at unity power factor.

A system of converting wind generated electricity to constant frequency electricity for supplying it to a utility grid, comprising:

• a wind turbine generator having a doubly fed induction generator;
• said generator having a rotor for generating electricity from the rotor of the generator for supplying it to the utility grid when operating at a rotational speed of the generator above synchronous speed;
• a generator converter for converting the electricity from the rotor to dc electricity above synchronous speed of the generator;
• a generator converter for supplying electricity to the rotor of the generator when operating at a rotational speed below the synchronous speed of the generator and for facilitating the generation of electricity from the stator;
• a utility converter for converting the dc electricity to ac electricity;
• at least one circuit for adjusting the current of the ac electricity to or from the utility grid to be maintained in phase with the utility grid voltage;
• and
• wherein the ac electricity is maintained substantially at unity power factor.

A method of converting wind generated electricity to constant frequency electricity for supplying it to a utility grid by using a wind turbine generator having a doubly fed induction generator for generating electricity from the rotor of the generator when operating at a rotational speed of the generator above synchronous speed for supplying it to the utility grid, comprising:

• supplying electricity to the rotor of the generator when operating at a rotational speed and facilitating the generation of electricity from the stator;
• converting the electricity from the rotor to dc electricity and converting the dc electricity to ac electricity;
• adjusting the current of the ac electricity to or from the utility grid to be maintained in phase with the utility grid voltage;
• and
• wherein the ac electricity is maintained substantially at unity power factor.

A method of converting wind generated electricity to constant frequency electricity for supplying it to a utility grid, comprising:

• using a wind turbine generator having a doubly fed induction generator;
• generating electricity from the rotor of the generator for supplying it to the utility grid when operating at a rotational speed of the generator above synchronous speed;
• converting the electricity from the rotor to dc electricity and converting the dc electricity to ac electricity;
• adjusting the current of the ac electricity to or from the utility grid to be maintained in phase with the utility grid voltage;
• and
• wherein the ac electricity is maintained substantially at unity power factor.

A method of converting wind generated electricity to constant frequency electricity for supplying it to a utility grid, comprising:

• using a wind turbine generator having a doubly fed induction generator;
• supplying electricity to the rotor of the generator when operating at a rotational speed below the synchronous speed of the generator and facilitating the generation of electricity from the stator;
• converting the electricity from the grid to dc electricity and converting the dc electricity to ac electricity;
• adjusting the current flowing from the utility grid to be maintained in phase with the utility grid voltage;
• and
• wherein the ac electricity supplied to the rotor is maintained substantially at unity power factor.

A system of converting wind generated electricity for supplying it to a utility grid, comprising:

• a wind turbine generator having a doubly fed induction generator;
• means for generating electricity from the rotor of the generator for supplying it to the utility grid when operating at a rotational speed of the generator above synchronous speed;
• means for converting the electricity from the rotor to dc electricity and converting the dc electricity to ac electricity above synchronous speed of the generator;
• means for adjusting the current of the ac electricity to or from the utility grid to be maintained in phase with the utility grid voltage;
• and
• wherein the ac electricity is maintained substantially at unity power factor.

A system of converting wind generated electricity for supplying it to a utility grid, comprising:

• a wind turbine generator having a doubly fed induction generator;
• means for supplying electricity to the rotor of the generator when operating at a rotational speed below the synchronous speed of the generator and for facilitating the generation of electricity from the stator;
• means for converting the electricity from the grid to dc electricity and converting the dc electricity to ac electricity and for supplying the ac electricity to the rotor;
• means for adjusting the current flowing from the utility grid to be maintained in phase with the utility grid voltage;
• and
• wherein the ac electricity supplied to the rotor is maintained substantially at unity power factor.

A system of converting wind generated electricity to constant frequency electricity for supplying it to a utility grid, comprising:

• a wind turbine generator having a doubly fed induction generator;
• said generator having a rotor for generating electricity from the rotor of the generator for supplying it to the utility grid when operating at a rotational speed of the generator above synchronous speed;
• a generator converter for converting the electricity from the rotor to dc electricity above synchronous speed of the generator;
• a utility converter for converting the dc electricity to ac electricity;
• at least one circuit for adjusting the current of the ac electricity flowing to the utility grid to be maintained in phase with the utility grid voltage;
• and
• wherein the ac electricity is maintained substantially at unity power factor.

A system of converting wind generated electricity to constant frequency electricity for supplying it to a utility grid, comprising:

• a wind turbine generator having a doubly fed induction generator;
• said generator having a rotor;
• a generator converter for supplying electricity to the rotor of the generator when operating at a rotational speed below the synchronous speed of the generator and for facilitating the generation of electricity from the stator;
• a utility converter for converting the ac electricity from the grid to dc electricity;
• at least one circuit for adjusting the current flowing from the utility grid to be maintained in phase with the utility grid voltage;
• converting the dc electricity to ac electricity;
• and
• wherein the ac electricity is supplied to the rotor.