Zero-Voltage Ride-Through Capability of Single-Phase Grid-Connected Photovoltaic Systems

Abstract

Distributed renewable energy systems play an increasing role in today's energy paradigm. Thus, intensive research activities have been centered on improving the performance of renewable energy systems, including photovoltaic (PV) systems, which should be of multiple-functionality. That is, the PV systems should be more intelligent in the consideration of grid stability, reliability, and fault protection. Therefore, in this paper, the performance of single-phase grid-connected PV systems under an extreme grid fault (i.e., when the grid voltage dips to zero) is explored. It has been revealed that combining a fast and accurate synchronization mechanism with appropriate control strategies for the zero-voltage ride-through (ZVRT) operation is mandatory. Accordingly, the representative synchronization techniques (i.e., the phase-locked loop (PLL) methods) in the ZVRT operation are compared in terms of detection precision and dynamic response. It shows that the second-order generalized integrator (SOGI-PLL) is a promising solution for single-phase systems in the case of fault ride-through. A control strategy by modifying the SOGI-PLL scheme is then introduced to single-phase grid-connected PV systems for ZVRT operation. Simulations are performed to verify the discussions. The results have demonstrated that the proposed method can help single-phase PV systems to temporarily ride through zero-voltage faults with good dynamics.

A review of fault ride through of PV and wind renewable energies in grid codes

“…In this paper, 38 countries' or regions' grid code FRT capabilities are compared and analyzed. Figure shows the FRT curves of grid codes with specific PV‐related regulations . Characteristics of FRT capability including LVRT and ZVRT curves in various grid codes are shown in Figures and , respectively.…”

“…Figure 5 shows the FRT curves of grid codes with specific PV-related regulations. 40,[50][51][52] Characteristics of FRT capability including LVRT and ZVRT curves in various grid codes are shown in Figures 6 and 7, respectively. Each figure is divided into three parts according to the time zone of voltage comeback.…”

A New Synchronization Technique of a Three-Phase Grid Tied Inverter for Photovoltaic Applications

“…The Phase Lock Loop (PLL) is a control system designed to generate the reference output signals related to the input signals for each phase. There are different types of PLL methods in the world of electronic and communication system [1][2][3][4][5][6][7][16][17][18][19][20][21][22][23][24][25][26]. These PLL control systems are designed according to variable frequency and signal phase detector in feedback signals loop, PLL filtering technique, and PLL prefiltering technique.…”

Special Issue on Advancing Grid-Connected Renewable Generation Systems

“…The fourth one introduces a detailed probabilistic reliability model for a PV system [9], authored by A. Alferidi and R. Karki. The last paper about the PV technologies was authored by Z. Zhang, Y. Yang, R. Ma, and F. Blaabjerg, where the zero-voltage ride-through capability for single-phase grid-connected PV systems is analyzed [10]. The study was dedicated to improving the performance of the grid under zero-voltage faults in the case of a wide-scale adoption of PV systems.…”