About Principle of power limiting of photovoltaic inverter
Under grid voltage sags, over current protection and exploiting the maximum capacity of the inverter are the two main goals of grid-connected PV inverters.
Under grid voltage sags, over current protection and exploiting the maximum capacity of the inverter are the two main goals of grid-connected PV inverters.
Power Limit – limits the inverter maximum output power. The power limit can be set to any value between 0-100 [% of nominal active power].
The main objective of the CPG control strategy is to limit the PV output power to a certain power-limit level. This requirement can be achieved by regulating the operating point of the PV array below the MPP, as it is illustrated in Fig. 15.9. In principle, there are two possible operating points—CPP-L and CPP-R for a certain power-limit .
In this paper, the Boost circuit in the front stage of the photovoltaic inverter provides coordinated control of maximum power point tracking control (MPPT) and variable power point tracking control (VPPT). VPPT control can limit the photovoltaic power to a certain level (below the maximum available power).
For a grid-connected PV system, inverters are the crucial part required to convert dc power from solar arrays to ac power transported into the power grid. The control performance and stability of inverters severely affect the PV system, and lots of works have explored how to analyze and improve PV inverters’ control stability [ 6 ].
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