Voltage and frequency transformation systems, methods and devices for wind power electric energy

A voltage and frequency transformation system, comprising:

• an electric energy input circuitry, to input low-frequency electric energy with frequency lower than a first predetermined frequency threshold;
• the low-frequency electric energy being one of low-frequency and low-voltage electric energy and low-frequency and high-voltage electric energy;
• a first frequency transformation circuitry, connected with the electric energy input circuitry, to carry out frequency transformation on the low-frequency electric energy to obtain high-frequency electric energy with frequency higher than a second predetermined frequency threshold;
• the high-frequency electric energy being one of first high-frequency and low-voltage electric energy and first high-frequency and high-voltage electric energy;
• a transformer, connected with the first frequency transformation circuitry, to carry out voltage transformation on the high-frequency electric energy to obtain second high-frequency electric energy after voltage transformation;
• the second high-frequency electric energy being one of second high-frequency and high-voltage electric energy and second high-frequency and low-voltage electric energy;
• a second frequency transformation circuitry, connected with the transformer, to carry out frequency transformation on the high-frequency electric energy after voltage transformation to obtain second low-frequency electric energy with frequency within a predetermined frequency threshold range;
• the second low-frequency electric energy being one of second low-frequency and high-voltage electric energy and second low-frequency and low-voltage electric energy;
• the second low-frequency and high-voltage electric energy to be used for long-distance power transmission;
• the second low-frequency and low-voltage electric energy to be used for driving electric terminals;
• an electric energy output terminal, connected with the second frequency transformation circuitry, to output the second low-frequency electric energy;
• wherein in a case that the low-frequency electric energy is the low-frequency and low-voltage electric energy, the high-frequency electric energy is the first high-frequency and low-voltage electric energy, the second high-frequency electric energy is the second high-frequency and high-voltage electric energy, and the second low-frequency electric energy is the second low-frequency and high-voltage electric energy;
• and
• in a case that the low-frequency electric energy is the low-frequency and high-voltage electric energy, the high-frequency electric energy is the first high-frequency and high-voltage electric energy, the second high-frequency electric energy is the second high-frequency and low-voltage electric energy, and the second low-frequency electric energy is the second low-frequency and low-voltage electric energy;
• wherein the low-frequency and low-voltage electric energy is electric energy from a wind power generation system and has a voltage equivalent to the rated voltage of a wind power generation system, and the low-frequency and high-voltage electric energy is electric energy from a micro-grid and has a voltage equivalent to a rated voltage of the micro-grid;
• and
• the second high-frequency and low-voltage electric energy has a voltage equivalent to a rated voltage of the electric terminals, and the second high-frequency and high-voltage electric energy has a voltage equivalent to a rated voltage of a power grid or equivalent to a rated voltage of the micro-grid.