초록 ▼

A medium frequency transformer and electronic switches operate together to transfer electric power with variable voltage characteristics to a utility for co-generation purposes. Electric power with variable voltage, such as produced by a wind generator, is converted to variable voltage dc electric p

A medium frequency transformer and electronic switches operate together to transfer electric power with variable voltage characteristics to a utility for co-generation purposes. Electric power with variable voltage, such as produced by a wind generator, is converted to variable voltage dc electric power. An inverter converts the variable voltage dc power to ac electric power of medium frequency and then matches the voltage of a utility power grid by using a medium frequency power transformer before injecting the power into that utility power grid. The amount of electric power that is transferred may be controlled, such that an input power source is allowed to operate at its optimum power output.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for transferring electric power from a variable voltage direct current source to a provider of alternating electric power with constant voltage and frequency characteristics comprising:a. switching means for the purpose of converting said variable voltage dc

[ What is claimed is:] [1.] An apparatus for transferring electric power from a variable voltage direct current source to a provider of alternating electric power with constant voltage and frequency characteristics comprising:a. switching means for the purpose of converting said variable voltage dc power to alternating current power of substantially higher frequency than frequency of said provider of electric power;b. alternating current transforming means with multiple secondary windings to convert said higher frequency ac power to multiple instances of ac power with different output voltage characteristics;c. multiple separate ac to dc conversion means to convert said instances of ac power with different output voltage characteristics to an identical number of instances of dc power with different voltage characteristics;d. switching means synchronized to frequency of said provider of electric power to connect any one of said multiple instances of dc power with different voltage characteristics to said provider of electric power, such that at most one of said instances of dc power is connected to said provider of electric power at any moment in time; the voltage of said connected instance of dc power is additionally characterized by being the instance in closest proximity above the voltage of said provider of electric power during its positive half cycle, and by being the instance in closest proximity below the voltage of said provider of electric power during its negative half cycle;e. controlling means to monitor a number of parameters including the voltage of said provider of electric power of constant frequency and voltage, the timing of said provider of electric power, the voltage of said variable voltage dc input power, the values of the positive and negative currents of said ac power of higher frequency;f. said controlling means derives from said parameters timed switching signals controlling said switching means for the purpose of connecting said variable voltage dc input power to said transforming means at a substantially higher frequency than the frequency of said provider of electric power of constant frequency and voltage;g. additionally, said controlling means derives from said parameters timed switching signals for said switching means connecting at most one of said instances of dc power with different output voltage characteristics to said provider of electric power with constant frequency and voltage in synchronism with said constant frequency;h. additionally, said alternating current transforming means has coaxial windings characterized by the secondary windings being located within a tubular primary winding; reby electric power is transferred efficiently from a variable voltage dc power source to said provider of alternating electric power of constant frequency and voltage.