Transient Voltage Characteristics Analysis of DC Receiving-End Power Grid with Large-Scale Integrated Distributed Photovoltaics

Le résumé fourni par la source

As the construction of ultra-high-voltage direct current (UHVDC) transmission projects progresses, more regions are forming receiving-end power grids that integrate new energy sources and DC injection, significantly impacting the transient voltage stability of the power system. To investigate the effects of high proportions of distributed photovoltaic (PV) integration on the stability of the new power system, it is crucial to consider both DC injection and distributed PV integration in the analysis to understand the new characteristics of transient voltage at the receiving end of the grid. Initially, the study focuses on examining the new P-V characteristics of distributed PV systems interconnected with the distribution network at high penetration levels to evaluate the system's transient behavior. Subsequently, by integrating the dynamic characteristics of DC system reactive power after faults in the receiving-end AC system, and using the CIGRE standard test model, the analysis assesses the risks of DC commutation failure and transient voltage instability in the receiving-end AC system under varying distributed PV installation capacities. The results indicate that the strength of the DC receiving-end grid weakens as the PV station integration capacity increases, and under conditions where a three-phase fault occurs at the point of integration, consecutive commutation failures may potentially occur. Finally, leveraging actual data from the Tianzhong DC project in the Henan Power Grid, a receiving-end grid model incorporating the DC transmission system and distributed PV power sources is established. The study investigates the new characteristics of transient voltage at the receiving end of the grid under high proportions of distributed PV integration, confirming that the increasing installation capacity of distributed PV exacerbates the risk of transient voltage instability in the DC receiving-end grid.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.