Abstract: With the integration of large-scale renewable energy, the weak support of the renewable energy power generation equipment makes it difficult for the grid voltage strength to meet the needs of safe and stable operation. By configuring the synchronous condensers, the voltage strength of the power grid can be effectively increased. However, in the current actual power grid production and operation, there is a lack of feasible synchronous condenser configuration methods. Based on the evaluation effect of the multiple renewable energy stations short circuit ratio (MRSCR) on the grid voltage strength, this paper analyzes the influence of synchronous condenser access on the MRSCR, and proposes a distributed/centralized hybrid optimal configuration scheme based on the quantitative index of grid voltage strength. This method significantly increases the grid voltage strength after the renewable energy is connected by configuring the synchronous condensers with a smaller total capacity. Combined with the calculation results of the full electromagnetic simulation and the electromechanical transient simulation on the typical examples, it can be seen that the synchronous condenser configuration method proposed in this paper can effectively increase the grid voltage strength. Compared with the traditional configuration method, the total capacity of the required synchronous condenser can be significantly reduced.