Renewable Energy Reactive Power Parameters Optimization during LVRT at DC Sending End Adapted to Multi-objective Voltage Control

In the process of low-carbon transformation of the energy system, the proportion of renewable energy units in the system has increased rapidly, and the proportion of conventional energy units has decreased, the renewable energy protection parameters and the control of the grid are more closely coupled. The impact of reactive power output during the Low-Voltage Ride-Through (LVRT) of renewable energy is prominent, faults happened in different places will impose different reactive power requirements on renewable energy, and even contradict with each other. This paper aims at the changes of the voltage after the grid failure caused by the reactive power output of the renewable energy during the LVRT, and analyzes the amount of reactive current coefficient parameter optimization for the security control measures of the system low voltage problem after the AC failure and the transient overvoltage problem after the DC failure. A comprehensive optimization model considering the amount of stability measures and DC transmission power is established, and a renewable energy reactive power parameters optimization during LVRT at DC sending end adapted to multi-objective voltage control is come up. The effectiveness of this optimization process is verified by simulation examples.