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AC-DC-AC Three-Phase Converter Based on Three Three-Leg Converters Connected in Series Abstract: An unidirectional three-phase to three-phase dc link converter is proposed in this paper. It is composed of three unidirectional ac-dc-ac three-leg converters. The three-leg converter is composed of a non-controlled leg, two controlled legs and a dc-link. A suitable model and control strategy of the system, including a synchronization method, are proposed. The synchronization method, associated with the PWM strategy, imposes the grid currents and load voltages have the same phase angle of the converter voltages. This method ensures sinusoidal grid currents and mitigate the zero-crossing distortions normally caused by the use of diodes. Simulation and experimental results are also presented for validation purposes. Existing system: With the continuous progress of human civilization, greater amounts of energy are required. Thus, the development of new types of power converters for processing energy has became very important. In this context, further studies of single-phase and three-phase inverters in series and in parallel are being widely discussed in literature. The association of single-phase inverters in series to form three-phase converters is discussed in and. Such series and parallel converters can be used in the chemical and oil industries, power generation and power transmission. Proposed system: The proposed system presents an unidirectional three-phase ac-dc ac converter that combines three unidirectional single-phase three-leg ac-dc-ac converters in series. The converter uses six diodes and twelve controlled switches (each controlled switch is formed by an IGBT and a diode), The advantages of this configuration are: i) lower dc-link voltage, reducing the voltage stress across the devices and ii) multilevel input and output voltages with lower harmonic distortion in the grid currents and load voltages when compared to the conventional converter. Block diagram: Reference: [1] S. Rahman and A. de Castro. Environmental impacts of electricity generation: a global perspective. IEEE Trans. Energy Conversion, 10(2):307–314, 1995. [2] B.K. Bose. Advances in power electronics and drives-their impact on energy and environment. In Proc. Power Electron. Drives and Energy Syst. for Ind. Growth, volume 1, page 1, 1998. [3] F. Blaabjerg and J.K. Pedersen. An integrated high power factor three-phase ac-dc-ac converter for ac-machines implemented in one microcontroller. In Proc. Power Electron. Specialists Conf.. PESC ’93, pages 285–292, 1993. [4] P.A.J. Stecanella, M.A.A. Faria, E.G. Domingues, P.H.G. Gomes, W.P. Calixto, and A.J. Alves. Eletricity generation using thermoelectric generator - teg. In Environment and Electrical Engineering (EEEIC), 2015 IEEE 15th International Conference on, pages 2104–2108, June 2015.