In a photovoltaic DC boost collection station, the photovoltaic array is collected after DC/DC boost, and then connected to the AC power grid after being inverted by the DC/AC converter station. For the grid-connected system of multiple photovoltaic DC voltage boosting stations, the output reactive current of the grid-connected DC/AC converter station is affected by its own capacity and the voltage drop degree of the port. Under the unclear coordination mechanism, it is difficult to set the output reactive power, and there is a risk of disconnection of the station near the fault. Therefore, based on the analysis of the influence of the reactive power output of each DC/AC converter station on the port voltage, an overall cooperative low voltage ride-through control strategy of the grid-connected system of the photovoltaic DC voltage boosting station is proposed. After entering the low voltage ride-through, the DC/AC converter station detects the local port voltage and immediately injects reactive power into the power grid for support. The master control station obtains the port voltage of each converter station through communication, and then coordinates the reactive current output quota of each converter station. At the same time, the reactive current output of the DC/AC converter station is adjusted by a detailed coordination mechanism under different working conditions. The simulation results show that the proposed control strategy can effectively coordinate the reactive power compensation of each DC/AC converter station and improve the overall low voltage ride-through capability of the system when the AC power grid fails.