Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)The Space Vector PWM implementation and operation for a Four-leg Voltage Source Inverter (VSI) is detailed and discussed in this paper. Although less common, four-leg VSIs are a viable solution for situations where neutral connection is necessary, including Active Power Filter applications. This topology presents advantages regarding the VSI DC link and capacitance, which make it useful for high power devices. Theory, implementation and simulations are also discussed in this paper. © 2011 IEEE. 7986CAPES,Cons. Nac. Desenvolv. Cient. Tecnol. (CNPq),CREDSUPER/UNICRED - Filiada ao Sistema,IEEE Power Electronics Society (PELS),FAPERNConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Zhang, R., Prasad, V., Boroyevich, D., Lee, F., Three-dimensional space vector modulation for four-leg voltage-source converters (2002) Power Electronics, 17 (3), pp. 314-326. , IEEE Transactions on mayZhang, R., (1998) High Performance Power Converter Systems for Nonlinear and Unbalanced Load/Source, , Ph.D. dissertation, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USAAredes, M., Hafner, J., Heumann, K., Three-phase four-wire shunt active filter control strategies (1997) Power Electronics, 12 (2), pp. 311-318. , IEEE Transactions on marVillalva, M., Ruppert, E., 3-d space vector pwm for three-leg four-wire voltage source inverters (2004) Power Electronics Specialists Conference, 2004, 5, pp. 3946-3951. , PESC 04. 2004 IEEE 35th Annual june 5Quinn, C., Mohan, N., Active filtering of harmonic currents in three-phase, four-wire systems with three-phase and single-phase nonlinear loads (1992) Applied Power Electronics Conference and Exposition, 1992, pp. 829-836. , APEC '92. Conference Proceedings 1992., Seventh Annual, febQuinn, C., Mohan, N., Mehta, H., A four-wire, current-controlled converter provides harmonic neutralization in three-phase, four-wire systems (1993) Applied Power Electronics Conference and Exposition, 1993, pp. 841-846. , APEC '93. Conference Proceedings 1993., Eighth Annual, marVan Der Broeck, H., Skudelny, H.-C., Stanke, G., Analysis and realization of a pulsewidth modulator based on voltage space vectors (1988) Industry Applications, 24 (1), pp. 142-150. , IEEE Transactions on jan/febShen, D., Lehn, P., Fixed-frequency space-vector-modulation control for three-phase four-leg active power filters (2002) Electric Power Applications, 149 (4), pp. 268-274. , IEE Proceedings julyKouzou, A., Mahmoudi, M., Boucherit, M., A new 3d-svpwm algorithm for four-leg inverters (2009) Electric Machines and Drives Conference, 2009, pp. 1674-1681. , IEMDC '09. IEEE International, maySawant, R., Chandorkar, M., A multi-functional four-leg grid connected compensator (2007) Power Conversion Conference - Nagoya, 2007, pp. 1085-1092. , PCC '07, aprilOrtjohann, E., Mohd, A., Hamsic, N., Al-Daib, A., Lingemann, M., Three-dimensional space vector modulation algorithm for three-leg four-wire voltage source inverters (2007) Power Engineering, Energy and Electrical Drives, 2007, pp. 605-610. , POWERENG 2007. International Conference on, aprilHoltz, J., Pulsewidth modulation for electronic power conversion (1994) Proceedings of the IEEE, 82 (8), pp. 1194-1214. , augLiu, C., Peng, D., Lai, J., Lee, F., Boroyevich, D., Zhang, R., Four-legged converter 3-d svm scheme over-modulation study (2000) Applied Power Electronics Conference and Exposition, 2000, 1, pp. 562-568. , APEC 2000. Fifteenth Annual IEEE 1Akagi, H., Ogasawara, S., Kim, H., The theory of instantaneous power in three-phase four-wire systems: A comprehensive approach (1999) Industry Applications Conference, 1999. Thirty-fourth IAS Annual Meeting, 1, pp. 431-439. , Conference Record of the 1999 IEEE 1Akagi, H., Watanabe, E., Aredes, M., (2007) Instantaneous Power Theory and Applications to Power Conditioning(), , IEEE PressTeodorescu, R., Blaabjerg, F., Liserre, M., Loh, P., Proportional-resonant controllers and filters for grid-connected voltage-source converters (2006) Electric Power Applications, IEE Proceedings, 153 (5), pp. 750-762. , september