  Due to the energy crisis and environmental pollution, the installed capacity
of inverter-based resources (IBRs) in power grids is rapidly increasing, and
grid-following control (GFL) is the most prevalent at present. Meanwhile,
grid-forming control-based (GFM) devices have been installed in the grid to
provide active support for frequency and voltage. In the future GFL devices
combined with GFM will be promising, especially in power systems with high
penetration or 100% IBRs. When a short-circuit fault occurs in the grid, the
controlled current source characteristic of the GFL devices leads to
insufficient dynamic voltage support (DVS), while the GFM devices usually
reduce the internal voltage to limit the current. Thus, deep voltage sags and
undesired disconnections of IBRs may occur. Moreover, due to the dispersed
locations and the control strategies' diversity of IBRs, the voltage support of
different devices may not be fully coordinated, which is not conducive to
short-term voltage security (STVS). To address this issue, a control scheme
based on the simulation of transient characteristics of synchronous machines
(SMs) is proposed. Then, a new fault ride-through strategy (FRT) is proposed
based on the characteristic differences between GFL and GFM devices, and an
optimization model of multi-device control parameters is formulated to meet the
short-term voltage security constraints (SVSCs) and device capacity
constraints. Finally, a fast solution method based on analytical modeling is
proposed for the model. Test results based on the doublegenerator-one-load
system, the IEEE 14-bus system, and other systems of different sizes show that
the proposed method can effectively enhance the active support capability of
GFL and GFM to the grid voltage, and avoid the large-scale disconnection of
IBRs
