Abstract
Power quality and current limitation are the most important aspects of the grid-connected power converters under fault. Since the distributed energy resources are widely used, fault management strategy is important for micro-grids applications. This paper presents a new control strategy for low-voltage ride-through for 3-phase grid-connected photovoltaic systems. The proposed method, which is designed in a synchronous frame using positive and negative sequence components, can protect the inverter from overcurrent failure under both symmetrical and unsymmetrical faults and provides reactive power support. The method does not require a hard switch to switch from MPPT to a non-MPPT algorithm, which ensures a smooth transition.
Highlights
During the last decades, the use of distributed energy resources (DERs) has increased due to economical, technical and environment concerns [1], [2]
This paper proposes a low voltage ride-through (LVRT) control strategy for gridconnected PV systems
The method is based on the classic cascaded voltage and current loops in dq-frame, while the positive and negative sequences of d-component voltage is used to adjust the reference DC-link voltage to limit the inverter current during a voltage sag
Summary
The use of distributed energy resources (DERs) has increased due to economical, technical and environment concerns [1], [2]. Reference [11] has proposed an LVRT control scheme using the symmetrical components in synchronous frame for grid-connected inverter without considering the renewable energy sources, neither a PV nor a wind turbine This is important as a comprehensive method must take the input power from the intermittent source into account such that it limits the input power during faults without disturbing MPPT during normal operation. The paper is structured as follow: In Section II, the proposed LVRT control scheme is presented, including the method to estimate the positive sequence and negative sequence components for voltage and current in synchronous frame, voltage loop design with the proposed current limiting strategy, reactive power injection and current loop design.
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