Research on the Mechanism of Transient Overvoltage in Photovoltaic Grid-Connected HVDC Systems
The utilization of Ultra-High-Voltage Direct Current(UHVDC)transmission technology for the long-distance trans-mission of renewable energy,particularly from photovoltaic(PV)stations,is a critical future development.However,this ap-proach faces challenges such as a weak transmission system prone to disturbances,leading to transient overvoltage problems.In PV grid-connected systems,the presence of numerous power-electronic-based reactive power sources in PV stations,combined with control loop delays during reactive power regulation,can further exacerbate transient overvoltage.To enhance the stability and reliability of UHVDC PV grid-connected system,it is essential to analyze the mechanisms underlying transient overvoltage.To address this,equivalent simulation models for PV stations,Static Var Generators(SVG),and PV grid-connected systems are first established.Then,the PSCAD simulation platform is employed to simulate and analyze transient overvoltage conditions in PV grid-connected systems under typical DC faults,such as commutation failure and DC blockages.The simulations reveal the transient overvoltage mechanisms in UHVDC PV grid-connected systems under these typical DC fault scenarios.
extra-high voltage direct current transmissiongrid-connected photovoltaic systemsreactive power compensation devicetransient overvoltage
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维普
