Per-phase vector control strategy for a four-leg voltage source inverter operating with highly unbalanced loads in stand-alone hybrid systems |
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| Affiliation: | 1. The Andrew and Erna Viterbi Faculty of Electrical Engineering, Technion—Israel Institute of Technology, Haifa 3200003, Israel;2. Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, Haifa 3200003, Israel;1. Department of Electrical and Electronic Engineering, Shiraz University of Technology, Shiraz, Iran;2. Department of Electrical and Computer Engineering, University of Michigan, Dearborn, USA;1. Amrita Vishwa Vidyapeetham University, Coimbatore 641 112, India;2. Government College of Technology, Coimbatore 641 013, India;1. Electric Engineering Department, Federal University of Viçosa, 36570-900 Viçosa, Brazil;2. Department of Materials Engineering, Federal Center for Technological Education of Minas Gerais, Av. Amazonas 5253, 30421-169 Belo Horizonte, MG, Brazil;3. Department of Electrical Engineering, Federal University of Minas Gerais, Av. Pres. Antônio Carlos, 6627 Belo Horizonte, MG, Brazil |
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| Abstract: | This paper proposes a new per-phase vector (dq) control scheme for a four-leg grid-forming inverter operating in a three-phase four-wire hybrid stand-alone power system (mini-grid). The challenge is to provide balanced output voltages to highly unbalanced loads, very common in such systems, with a fast dynamic response. By using dq control in a per-phase basis one avoids the use of slow filter-based symmetrical components calculators (SCCs) while achieving zero error, i.e. voltage balancing, in steady-state. Further improvement in the dynamic response is achieved by using fictive axis emulation for obtaining the orthogonal current components required for the per-phase dq control. Simulation and experimental results are provided, to demonstrate the good performance of the system. It works very well, even when the grid-forming inverter supplies active power in two phases and absorbs in the other one, due to the presence of a single-phase PV inverter in the hybrid mini-grid. |
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| Keywords: | Battery Distributed power generation Inverter Mini-grid Renewable energy Stand-alone hybrid system |
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