The high proportion of renewable energy grid connection and large-scale application of power electronic equipment significantly reduce the voltage and frequency stability of traditional power systems, and also easily lead to voltage and wideband oscillation problems under electromagnetic transients. Grid type energy storage, as a voltage source, has become an important technology to ensure the stable operation of new power systems. However, when multiple machines are connected in parallel, if the control parameters do not match, low-frequency oscillations are prone to occur. The article derives a reduced impedance model for grid type energy storage, clarifies that the key factor causing instability in grid type energy storage is the dynamic introduction of the current matrix by the reactive power control loop, and proposes a voltage feed forward optimization strategy based on the impedance model. The current matrix is reshaped to offset its negative impact on stability and ensure the stable operation of grid type energy storage. Finally, experimental verification is conducted, and the experimental results show the correctness and effectiveness of the proposed oscillation suppression method.