Abstract
When a three-phase induction generator (IG) supplies unbalanced loads, its terminal voltages and line currents are also unbalanced, which may cause the IG to overheat and need to be derated. A single-phase loaded self-excited induction generator (SEIG) works under most unfavorable load unbalance conditions. This paper proposes a three-capacitor circuit scheme and a method to find the values of the self-excitation capacitors that allow the SEIG to be balanced. The SEIG is modeled by a two-port network equivalent circuit that resolves the SEIG into its positive- and negative-sequence circuits associated with the self-excitation capacitors and the load. The network can then be analyzed by common AC circuit analysis techniques. Successful results for balancing the SEIG supplying a single-phase load have been achieved by properly choosing the values of the excitation capacitors. The proposed method has also been validated by experiments on a 0.37 kW SEIG.
Highlights
Induction generators (IGs) are receiving more attention than in the past because of their low prices, simple construction, little maintenance, ruggedness and the fact they do not need dc sources and brushes, which make them suitable as an energy conversion device for renewable energy sources such as wind, biogas and micro-hydro
The 1/2 hp squirrel-cage induction machine operating as an self-excited induction generator (SEIG) is set up as shown in Figure 5 for experiments
This paper has proposed a three-capacitor circuit scheme that is able to balance an SEIG supplying a single-phase load
Summary
Induction generators (IGs) are receiving more attention than in the past because of their low prices, simple construction, little maintenance, ruggedness and the fact they do not need dc sources and brushes, which make them suitable as an energy conversion device for renewable energy sources such as wind, biogas and micro-hydro. Fukami et al [4] proposed and analyzed a self-regulated three-phase SEIG working as a single-phase generator that consisted of two equal capacitors connected in series and another capacitor in parallel with the load resistor, and provided improved performance of voltage regulation. This generator scheme was further optimized by Mahato et al [5] using the sequential unconstrained minimization technique to obtain a maximum power output for both capacitive and inductive single-phase loads. The circuit scheme and the method for finding capacitances to balance the SEIG are validated by comparing results obtained by the two-port network SEIG model and by experiments on a 0.375 kW induction generator
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