Neutral Grounding Resistance

We have a bank of 11KV 2000KVA DG sets operating in parallel with the grid. The DG set neutrals are grounded through resistance to limit ground fault current to the full load current of the generators, Only one neutral is connected to ground when sets are operating in parallel. The complication comes when the sets are paralleled with grid. The supply company wants their transformer neutrals to be solidly grounded. If we remove the DG neutral from grounding when the DG sets are grid paralleled then we are subjecting the DG alternators to heavy ground fault current in the event of a ground fault. If we remove the transformer neutrals from ground and keep the DG resistance grounding in circuit then it is unacceptable to supply company. Could some one with similar experience illuminate how this situation can be handled?