Through the AC/DC microgrid simulation test system, in-depth research can be conducted on the grid integration of distributed energy resources, distributed energy storage, and energy management in microgrids. This facilitates the realization of distributed generation potential and mitigates the uncontrollability, insecurity, and instability arising from distributed power sources connecting to the main grid, thereby addressing numerous technical barriers and skepticism faced by distributed generation. In AC/DC microgrids, converters undertake critical tasks such as energy management and system stabilization, making research on them of paramount importance.

KeLiang possesses years of experience in microgrid modeling and field commissioning. Based on the RT-LAB real-time simulation platform, it has developed an AC/DC microgrid simulation test system. This system incorporates models of generators, photovoltaics, wind turbines, energy storage, and AC/DC loads, enabling steady-state and transient simulations of AC/DC microgrids. Furthermore, it facilitates in-depth research into several critical technical issues, including resonance and harmonic problems arising from the parallel integration of distributed power sources, the direct connection of distributed power sources and energy storage equipment to the DC side in microgrids, and the direct power supply to DC loads

Based on the RT-LAB real-time simulation platform, this system establishes primary and secondary models for generators, photovoltaics, wind turbines, energy storage, AC loads, and DC loads.

In addition to performing pure digital microgrid simulations, it can also externally connect to real control protection devices or primary equipment for Hardware-in-the-Loop (HIL) and Rapid Control Prototyping (RCP) testing.

■ Realize steady-state and transient simulation of AC/DC hybrid microgrids;

■ Achieve power matching between the main grid, multiple distributed power sources, energy storage units, and loads;

■ Enable flexible switching of multiple distributed power sources; realize fast and smooth control of microgrid transitions between grid-connected and islanded operating states;

■ Conduct experimental analysis on the characteristics of various faults occurring during operation;

■ Perform preliminary research on AC/DC hybrid microgrid systems, conducting in-depth studies on their various characteristics.

Digital Simulation

Construct primary system models and secondary control/protection strategies in the simulator, perform real-time digital simulation to validate system stability and the effectiveness of control/protection strategies.

The simulator is connected via Ethernet cable to the SCADA system.

HIL Simulation

Connect this system to a real microgrid energy management system. In the RT-LAB simulator, establish the primary system model of the microgrid and the grid control/protection logic to verify the effectiveness of the energy management strategy.

The RT-LAB simulator provides I/O interfaces to connect with the real energy management system and uses ethernet interfaces to link with the SCADA system.