A Communicationless Control Of Single Phase Two Winding SEIG By VSI Battery Based System

Abstract

This paper presents a novel communication less approach for voltage and frequency control of governor less 1-phase Self-Excited Induction Generator (SEIG) feeding variable linear loads. This operates under the off-grid environment with a single-phase Voltage Source Inverter (VSI)-Battery based Energy Storage System (BESS). Traditional control techniques for single phase SEIGs, depends on sensing of point of common coupling (PCC) voltage. And in the case of any fault occurring in the sensing line total system collapse. Moreover, this sensing line limits the location of converter modules to close proximity of the SEIG. In addition, presence of this link introduces noise. In this paper, a communication less control technique has been simulated for first time to control voltage and frequency of 1-phase SEIG. A VSI-BESS system which is located at a suitable location, operated in voltage control mode and connected to SEIG Main winding (PCC) via a highly inductive connecting line and synchronized using dynamically phase shifted Phase Locked Loop (PLL).VSI has been operated at a stiff operating frequency and SEIG tracks that frequency at steady state. With increase in reactive load Voltage amplitude SEIG dips, as a result voltage difference between two sides of the inductive line increases, which results in reactive power flow from VSI to PCC. Now to bring back the voltage magnitude of PCC to desired level, more reactive power injection is required. This is achieved by increasing VSI voltage amplitude proportionally with reactive power flow from the VSI itself. Advantage of this technique is that measurement of PCC voltage is no longer required and only inverter local voltage, current needs to be sensed which are used in reactive power calculation. Thus, the location of VSI-BESS becomes flexible and this enhances reliability. The proposed technique has been analyzed, and simulated in MATLAB-simulink environment.