Abstract
With continuously increasing of photovoltaic (PV) plant’s penetration, it has become a critical issue to improve the fault ride-through capability of PV plant. This paper refers to the German grid code, and the PV system is controlled to keep grid connected, as well as inject reactive current to grid when fault occurs. The mathematical model of PV system is established and the fault characteristic is studied with respect to the control strategy. By analyzing the effect of reactive power supplied by the PV system to the point of common coupling (PCC) voltage, this paper proposes an adaptive voltage support control strategy to enhance the fault ride-through capability of PV system. The control strategy fully utilizes the PV system’s capability of voltage support and takes the safety of equipment into account as well. At last, the proposed control strategy is verified by simulation.
Highlights
Under the pressures of environment pollution and energy shortages, power generation from renewable energy sources has been increasing significantly
This paper refers to the German grid code, and the PV system is controlled to keep grid connected, as well as inject reactive current to grid when fault occurs
By analyzing the effect of reactive power supplied by the PV system to the point of common coupling (PCC) voltage, this paper proposes an adaptive voltage support control strategy to enhance the fault ride-through capability of PV system
Summary
Under the pressures of environment pollution and energy shortages, power generation from renewable energy sources has been increasing significantly. What’s more, in the German grid code, the PV inverter is required to supply reactive power when voltage drops, so as to support the voltage. This requirement can make full use of the auxiliary functions of PV plant, which would take benefit to the participation of the PV plant[6]. This paper refers to the German grid code, and the PV inverter is controlled to supply reactive power when voltage drops. The effect of the reactive power from PV inverter to the point of common coupling (PCC) voltage is analyzed and an adaptive voltage support control strategy is proposed to enhance the fault ride-through capability of PV system. The proposed control strategy is verified by simulation
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