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http://dx.doi.org/10.6113/JPE.2016.16.4.1551

Flexible Voltage Support Control with Imbalance Mitigation Capability for Inverter-Based Distributed Generation Power Plants under Grid Faults  

Wang, Yuewu (School of Electric Power, South China University of Technology)
Yang, Ping (Guangdong Key Laboratory of Clean Energy Technology, South China University of Technology)
Xu, Zhirong (National-Local Joint Engineering Laboratory for Wind Power Control and Integration Technology, South China University of Technology)
Publication Information
Journal of Power Electronics / v.16, no.4, 2016 , pp. 1551-1564 More about this Journal
Abstract
The high penetration level of inverter-based distributed generation (DG) power plants is challenging the low-voltage ride-through requirements, especially under unbalanced voltage sags. Recently, a flexible injection of both positive- (PS) and negative-sequence (NS) reactive currents has been suggested for the next generation of grid codes. This can enhance the ancillary services for voltage support at the point of common coupling (PCC). In light of this, considering distant grid faults that occur in a mainly inductive grid, this paper proposes a complete voltage support control scheme for the interface inverters of medium or high-rated DG power plants. The first contribution is the development of a reactive current reference generator combining PS and NS, with a feature to increase the PS voltage and simultaneously decrease the NS voltage, to mitigate voltage imbalance. The second contribution is the design of a voltage support control loop with two flexible PCC voltage set points, which can ensure continuous operation within the limits required in grid codes. In addition, a current saturation strategy is also considered for deep voltage sags to avoid overcurrent protection. Finally, simulation and experimental results are presented to validate the effectiveness of the proposed control scheme.
Keywords
Distributed generation; Low-voltage ride-through; Positive and negative sequence current control; Voltage sag; Voltage support;
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