KEYWORDS: Photovoltaics, Power grids, Control systems, Solar energy, Solar cells, Power supplies, Intelligence systems, Stochastic processes, Safety, Roentgenium
The approach to large-scale PV has a lot of negative impacts on the distribution grid, such as the instability of the system voltage, the increase of harmonics etc. To solve the problem of voltage instability when PV is connected to power grid, this paper puts forward a strategy of using inverter for reactive power control, and makes full use of the reactive power regulation ability of the inverter Q (cos φ(U)) and Q(U). On the basis of the two control strategies, a weighted control method is proposed, which takes into account the control node voltage and improves the power factor of the system, and realizes the friendly grid-connected photovoltaic system.
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