Research on the control strategy and simulation of air-conditioning load in microgrid

This paper analyzes the circuit structure and working principle of air-conditioning load system in microgrid. The mathematical model of the interior permanent magnet synchronous motor (IPMSM) was built. A Sliding mode observer was used to detect the rotor space position by the estimation of extended electromotive force components in the two-phase stationary reference frame. The inverter driving IPMSM is not an ideal infinite sinusoidal power supply. A control algorithm combining Maximum Torque Per Ampere (MTPA), Flux-Weakening and over-modulation control was proposed to extend the working range of the motor and improve the control performance. The simulation model of the air-conditioning load system was built in Matlab/Simulink software environment, and the dynamic simulations were performed The simulation result shows that the model has good dynamic and static performance, and can control the IPMSM very well. The final system has high efficiency and high power factor, and has little impact on the micro grid. The simulation results also verify the correctness of the model and the validity of the control algorithm combining MTPA, Flux-Weakening and over-modulation control.