SUN Xiaoyu,LI Xiaohua,HUANG Fuquan,et al.Analysis and Suppression of Transient Overvoltage for Renewable Energy Grid-connected Inverters Considering Phase-locked Errors[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20250707009.
SUN Xiaoyu,LI Xiaohua,HUANG Fuquan,et al.Analysis and Suppression of Transient Overvoltage for Renewable Energy Grid-connected Inverters Considering Phase-locked Errors[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20250707009.DOI:
Analysis and Suppression of Transient Overvoltage for Renewable Energy Grid-connected Inverters Considering Phase-locked Errors
Against the backdrop of high-penetration grid integration of renewable energy
transient overvoltage during fault recovery has become a critical factor restricting the stable operation of power systems and the low voltage ride-through (LVRT) capability. During fault clearance
the phase-locked loop (PLL) can hardly track the grid phase accurately. The resulting phase-locked error induces overvoltage through a dual-channel mechanism of voltage and current. To tackle the above issue
this paper proposes a dual-channel control strategy integrating voltage feedforward and reference current command compensation on the basis of analyzing the action mechanism of phase-locked error. The proposed strategy suppresses the transient overvoltage caused by phase-locked error by collaboratively modifying the voltage feedforward term and current reference value in the current control loop. Compared with methods that improve PLL structure or adopt phase angle compensation
the proposed strategy is easy to implement and has low dependence on phase measurement accuracy. Finally
simulation results under multiple operating conditions verify the effectiveness of the proposed strategy in suppressing transient overvoltage and improving the system's fault ride-through capability.
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