Start-up Control and Frequency Oscillation Control of the 100% Renewable Energy Islanded Grid Fed by MMC-HVDC System

With the expansion of renewable energy generation on a larger scale, especially wind and photovoltaic, the power system with a high share of renewable energy and even 100% renewable energy will become the primary direction of modern power system development. The main issue endangering the future security and stable functioning of the new power system will be the low inertia issue that the high proportion renewable energy system is currently dealing with. Without the support of synchronous power supply, how to realize a smooth start and reliable grid connection of the system and how to have good fault traversal capability in the face of disturbance will become difficult and hot issues of future research. In this paper, a standard system model of 100% renewable energy islanded grid fed by MMC-HVDC is built based on PSCAD/EMTDC. In accordance with this model, this paper proposes the start-up control scheme and the frequency oscillation control scheme of the standard system model of 100% renewable energy islanded grid fed by MMC-HVDC and verifies their effectiveness by simulation.