AC voltage regulation is required in both domestic and industrial sectors to avoid undesired effects from random voltage variations of the power supply. The paper introduces an AC Voltage Stabiliser/Converter (ACVS) that is based on a controllable auto-transformer technology. The proposed ACVS offers a specified strategy of voltage regulation, less harmonics and low cost. The paper explains the operating principle of the ACVS and derives its nonlinear mathematical model. To ensure the desired performance of the ACVS while it is subject to uncertain input voltage and load variations, an optimal control strategy is designed. It is achieved via transforming the ACVS model extending with fictive axis emulation into a rotating reference frame and linearisation of the model via specific orientation of the reference frame and introducing a linear control action. Operation of the ACVS is simulated under different disturbances due to load and grid voltage changes, and compared to voltage stabilisation with application of I and PI controllers. Experimental results are presented to demonstrate the voltage regulation technology.
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