Abstract
In order to explore the emergency support effect of distributed energy storage on reducing the peak power flow of AC transmission lines and improving the operating power of DC transmission lines after UHV DC locking fault, based on the analysis of UHV DC locking fault, the active power is provided according to the distributed energy storage system. A mathematical model is established to reduce the peak power flow of AC transmission lines by distributed energy storage after DC locking. According to the relationship between power gap and frequency variation, a mathematical model of distributed energy storage to improve UHV DC operating power is established. Based on frequency variation and inertial response time, a mathematical model of dynamic response time of energy storage output on system support effect was established. Taking Henan Power Grid of UHV AC/DC hybrid operation as an example, the simulation analysis of distributed energy storage system response in two ways is carried out, which verifies the effectiveness of distributed energy storage system for emergency power support method after UHV DC locking.
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