This thesis reports the design and simulation of active synchronisation of renewable powered, inverter-based generation in microgrids using a method called Phase Locked Loop. In recent years, power generation has shifted from traditional fossil fuel power plants, to more modernised microgrid based power, which is basically generation from consumer’s homes. As a result, the trend of power generation then leans towards the use of power electronics equipment such as the inverters. Therefore, this necessitates synchronisation between the consumer’s homes to the grid, and the control system of the inverter must be designed such that the phase estimation carried out is accurate enough for synchronisation. In this thesis, the PLL control scheme - one of the many synchronisation methods - and its variations are designed and simulated, analysed, and critically compared in order to provide for an accurate understanding of how the PLL functions in phase estimation.