An industrial power grid with weak connection interface, small grid, and heavy load is prone to cause system stability damage after faults and splitting. For this reason, a DIgSILENT simulation platform is proposed for transient analysis and controller development of the generator-grid-load-storage coordination systems. An industrial grid digital twin system based on security and stability control, coordination control, PSS, AVR, governor and composite load is proposed. The controllers are modeled and compared by measured parameters. A generator and power grid coordination controller is designed based on the DSL programming, and parameters for voltage control, frequency control and power control are tuned. The influence on the frequency and voltage stability is verified, and the flexible configuration of the power of the contact section is realized. The controller can keep the voltage and frequency stable and realize flexible control of power. A Real Time Digital Simulator (RTDS) is used to carry out a closed-loop dynamic test for the generator and power grid coordination controller and security and stability controller. The simulation comparison results between DIgSILENT and RTDS is given. The correctness and effectiveness of the generator and power grid coordination control simulated by DIgSILENT are verified. This work is supported by the 2021 Science and Technology Major Project of Inner Mongolia Autonomous Region of China (No. 2021ZD0026).