Abstract
Photovoltaic (PV) generation system is an important way to promote energy transformation and to cope with environmental challenges, firstly, based on the steady-state power flow equations of the PV system AC side connected to weak grid, the influence of power grid structure parameters on their maximum transmission power is studied, which provides a theoretical basis for the design of subsequent virtual impedance; secondly, a time-domain small-signal model for PV system connected to weak grid is established, and based on the proposed small-signal model, eigenvalue analysis is employed to study the stability of PV system connected to weak grid within different grid strength. The results show that: in the case of a given SCR, the smaller the impedance angle is, the greater the maximum transmission power of the system is; when the output power of PV system is rated, the smaller grid impedance angle makes the PV system can operate under the weaker grid conditions; with the decreasing of the grid strength, the PV system prone to power oscillation Finally a virtual resistance control strategy is proposed to improve the operation stability of PV system The validity of the theoretical analysis and the feasibility of the control strategy are verified by time domain simulation.
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