Strategies to Increase the Transient Active Power of Photovoltaic Units during Low Voltage Ride Through

Due to a limitation in the magnitude of three-phase output inverter currents, active power photovoltaic (PV) unit has been de-rated during low voltage ride through, which brings great instability risk system. With increase penetration rate new energy, impact shortage on system transient stability increases. It is significance analyze this stability. This article explores methods improve capability units low-breakthrough periods. A simulation model grid-connected PV generator with low-voltage ride-through (LVRT) presented, under condition meeting overcurrent capacity and requirement dynamic reactive support supplied by specified China grid codes (GB/T 19964-2012) fault. An example high built. The change principle influencing factors are analyzed. designed PowerFactory/DIgSILENT, several types sags performed assess current reference calculation method maximum (Imax) limit value output. According three indexes, namely fault, improvement gradient surge after fault cleared. Simulation results showed that using orthogonal decomposition calculate can make full use converter. Setting Imax 1.1 rated (IN) reduce cost-effectiveness ratio unit. Therefore, we aim unit’s realize optimal effect improving