Equivalent Power Smoothing and Frequency Compensation for Large-scale Wind Power Equipment

摘要

Grid-side power converter is the key interface of the larger-scale wind power system connecting to the grid, with the continuous improvements of the penetration rate of the large-scale wind power equipment, the connected grid converter device plays more and more prominent influences on the large grid. Learning from the synchronous generator mathematical model in the traditional power system, a large-scale wind power equipment virtual synchronous generator (Virtual Synchronous Generator, VSG) is proposed to equivalently realize the power smoothing and frequency compensation. Firstly, the virtual speed governor and the virtual excitation governor with the individual characteristics of power electronic device are designed to guarantee the low harmonic distortion of the grid current, and at the same time have the functions of responding the grid voltage amplitudes] and frequency fluctuation event, and can be capable of improving the grid stability to a certain degree. And meanwhile simulate the rotational inertial of the synchronous generator, improve the inertial and damping characteristics of the grid interface and decrease the impact of the large-scale wind power generator system to the traditional grid. And at last, perform the verification and analysis to the feasibility and effectiveness of proposed method on basis of 110kW wind power generator set as well as the lithium battery energy storage unit.