AC-DC (Alternating Current-Direct Current) hybrid clean energy source system and method

Abstract

The invention discloses an AC-DC (Alternating Current-Direct Current) hybrid clean energy source system and an AC-DC hybrid clean energy source system method. The AC-DC hybrid clean energy source system comprises a plurality of doubly-fed induction generators, wherein the stator winding of each doubly-fed induction generator is connected with an AC bus; the rotor winding of each doubly-fed induction generator is connected with a DC bus through a converter; AC output by the AC bus is boosted by the converter and then is output directly and / or the AC output by the AC bus is boosted by the converter and is connected with a DC converter so as to output DC. The electric power output by each stator winding is accessed into an AC power transmission line through the AC bus and the converter; when each double-fed induction generator runs in a hypersynchronous state, the corresponding rotor winding outputs the electric power to the DC bus through the converter; when each double-fed induction generator runs in a sub-synchronous or synchronous state, the corresponding rotor winding absorbs the electric power from the DC bus through the converter. The AC-DC hybrid clean energy source system has the advantages that the space-time complementarity of the doubly-fed induction generators, double-fed synchronous generators, DC generators and photovoltaic power generation are sufficiently utilized, so that the influence on power grid from unstable clean energy source power fluctuation is reduced, the power grid spare capacity is reduced, and the power grid operation stability is improved.

Description

technical field [0001] The invention relates to a clean energy system, in particular to an alternating current and direct current hybrid clean energy system and method. Background technique [0002] With the current shortage of energy sources, more and more attention has been paid to the development of various new energy sources such as wind energy, solar energy, tidal energy and wave energy. In the development of these new energy sources, double-fed asynchronous generators, synchronous Generators, DC generators and photovoltaic power generation equipment. In order to improve the energy conversion efficiency of the prime mover driven by wind energy, tidal energy and wave energy, etc., the speed of the prime mover will change within a certain range, and the speed of the doubly-fed asynchronous generator and synchronous generator driven by it will change accordingly , the frequency of its electric power also changes, and it needs to be connected to the grid through a converte...

AI Technical Summary

Problems solved by technology

In order to improve the energy conversion efficiency of the prime mover driven by wind energy, tidal energy and wave energy, etc., the speed of the prime mover will change within a certain range, and the speed of the doubly-fed asynchronous generator and synchronous generator driven by it will change accordingly , the frequency of its electric power also changes, and it needs to be connected to the grid through a converter, resulting in unstable electric power and high harmonic content. The new energy has the characteristics of instability and randomness, which makes the quality of the electric energy it sends out low. After being connected to the grid, it will have a great impact on the grid, and sometimes even these energies have to be given up, causing a lot of waste.

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