Abstract
With the development of electric and electronic devices, in order to ensure their reliable work, the demand for the quality of electrical energy is becoming more and more high. However, the harmonic components seriously affect the quality of the power grid, and will cause uneven distribution of Grid inverter, series and parallel resonance, excitation current and fault current. By changing the impedance characteristics of the grid connected inverter, the virtual impedance technology can solve the impact of the above problems. It is easy to realize and is widely used. This paper will describe the application and implementation of virtual impedance technology for grid connected transformer.
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