關鍵字：微電網、孤島模式、併網模式、同步參考軸鎖相迴路 ;Abstract The purpose of this thesis is to implement an algorithm that enables the microgrid to switch between islanding and grid-connected operation modes smoothly and to operate stably. To be able to successfully grid-connected with utility grid, it is necessary to measure the three-phase voltage of the microgrid first. Calculate the phase angle through the phase-locked loop and meet the related grid codes or regulations. The phase detection adopts Synchronous Reference Frame (SRF-PLL). The advantage is that the topology is the simplest. When the microprocessor is in operation, it can simplify the computational complexity and it is easy to implement.
This thesis uses Matlab/Simulink to simulate the architecture of a microgrid and uses Dev-C++ simulation algorithm to verify its feasibility. Finally, the algorithm is written into the Renesas RX62T microprocessor for operation. In the hardware implementation, a microgrid is simulated by a three-phase four wire, half-bridge inverter. The inverter can be switched between island and grid mode by using the proposed algorithm. The voltage and current sensing circuit are used to output the three-phase voltage. The current is recall or feedback to the microprocessor for closed- loop operation control.
