标题：Flexible parameterizable grid-forming converter control by separated fast synchronization and slow inertia response control loops of Direct Voltage Control
摘要：AbstractAs power systems, transit to a state of high renewable penetration with predominant converter-based grid interface instead of synchronous generators applied by conventional power plants, the dynamics of the grid significantly change, causing new challenges for transmission system operations and arising new opportunities, as converter-based generation is highly controllable in faster timescales. This paper discusses the extension of the direct voltage control as ‘a decoupled grid forming converter controller’, which effectively relies on an accurate and fast d/q-reference frame determination to control the frequency as well as its rate of change at the common coupling point with the grid. The proposed controller separates the task of synchronizing the converter to the grid and providing virtual inertia into two distinct control functions, which enables a specific tuning of both functions for their task avoiding the necessity to find any kind of trade-off between quality of synchronization and inertia provision. The functionality of the proposed control is explained and demonstrated via EMT-Type simulations in different study cases for system-spilt, islanding, and re-synchronization scenarios.
关键词：Keywordsgrid forming inverterdirect voltage controlfrequency response, nadirrate of change of frequency (RoCoF)
