Abstract
A novel control strategy for the load converter supplying the unbalanced AC load in a DC isolated distribution system is presented. The control algorithm results in balanced and sinusoidal load voltages under unbalanced AC loading. The unbalanced load is characterized in the d-q-0 rotating coordinate based on symmetrical sequence components. Also, the mathematical model of the load converter in both a-b-c and d-q-0 coordinates is derived by using the average large signal model. Then, two control strategies for the load converter are presented. The first one uses the conventional d-q-0 controller to ensure the voltage and current regulation. The second one is a newly proposed control strategy based on the decomposition of the voltage and current into instantaneous positive, negative, and zero sequences. These three sequences are controlled independently in their own reference frames as DC signals. The performance of the load converter using these two control strategies is compared. Simulation results show the validity and capability of the newly proposed control strategy.
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References
Blazic, B., Papic, I., 2004. A new mathematical model and control of D-StatCom for operation under unbalanced conditions. Electr. Power Syst. Res., 72(3):279–287. [doi:10.1016/j.epsr.2004.04.012]
Daniel, S.A., AmmasaiGounden, N., 2004. A novel hybrid isolated generating system based on PV fed inverter-assisted wind-driven induction generators. IEEE Trans. Energy Conv., 19(2):416–422. [doi:10.1109/TEC.2004.827031]
Kouji, F., Haque, M.T., Ise, T., Sadatoshi, K., 2004. A control strategy for active filters using quasi-instantaneous positive sequence extraction filters. Electr. Eng. Jpn., 48(1):54–65.
Lin, B.R., Lee, Y.C., 2004. Three-phase power quality compensator under the unbalanced sources and nonlinear loads. IEEE Trans. Power Electron., 51(5):1009–1017.
Lu, W., Ooi, B.T., 2005. Premium quality power park based on multi-terminal HVDC. IEEE Trans. Power Del., 20(2):978–983. [doi:10.1109/TPWRD.2004.838633]
Saisho, M., Ise, T., Tsuji, K., 2002. Configuration of DC Loop Type Quality Control Center. Proc. Power Conversion Conf., Osaka, Japan, p.434–439. [doi:10.1109/PCC.2002.997557]
Short, T., 2004. Electric Power Distribution Handbook. CRC Press, New York, USA.
Thandi, G.S., Zhang, R., Xing, K., Lee, F.C., Boroyevich, D., 1999. Modeling, control and stability analysis of a PEBB based DC DPS. IEEE Trans. Power Del., 14(2):497–505. [doi:10.1109/61.754094]
Vechiu, I., Camblong, H., Tapia, G., Dakyo, B., Curea, O., 2007. Control of four leg inverter for hybrid power system applications with unbalanced load. Energy Conv. Manag., 48(7):2119–2128. [doi:10.1016/j.enconman.2006.12.019]
Zhang, R.S., 1998. High Performance Power Converter System for Nonlinear and Unbalanced Load/Source. PhD Thesis, Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.
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Noroozian, R., Abedi, M., Gharehpetian, G.B. et al. A novel control strategy for load converter of DC isolated distribution system under unbalanced loading conditions. J. Zhejiang Univ. Sci. A 10, 890–899 (2009). https://doi.org/10.1631/jzus.A0820294
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DOI: https://doi.org/10.1631/jzus.A0820294