This paper investigates the use of permanent magnet synchronous generators (PMSGs) for a wind energy conversion system (WECS) and a diesel engine driven generator (DG) set of a standalone hybrid system with a battery energy storage system (BESS). For voltage control at the point of common coupling (PCC) and balanced supply at terminals of DG set, a single phase D-Q theory based control algorithm is applied for the switching of voltage source converter (VSC) of BESS and the maximum power point tracking (MPPT) is achieved for WECS with an incremental conductance technique for the switching of a dc-dc boost converter. Simulation results of developed model of proposed standalone hybrid system, which is developed in MATLAB demonstrate performance of both the controllers and power quality improvement of the hybrid system.
- Diesel Generator
- Single-Phase D-Q theory
- Power Quality
Fig. 1 Schematic diagram of Wind-Diesel hybrid configuration
EXPECTED SIMULATION RESULTS:
Fig. 2 (a) Characteristics of the system with constant wind speed under varying loads.
Fig. 3 (b) Estimation of supply currents and voltages using control algorithm
Fig.4 (c) dynamic Performance of controller of hybrid system under varying linear loads at 10 m/s wind speed
Fig. 5(a) Characteristics of the system with constant wind speed under varying loads.
Fig. 6(b) Estimation of supply currents and voltages using control algorithm
Fig.7(c) dynamic Performance of controller of hybrid system under varying nonlinear loads at 10 m/s wind speed.
Fig. 8 waveforms and harmonic spectra (a) Phase ‘a’ supply voltage of at PCC (b) Phase ‘a’ supply current under nonlinear unbalanced loads.
Fig. 9 Controllers’ performance under wind speed reduction (11 m/s-8 m/s)
Fig. 10 Controllers’ performance under rise in wind speed (8 m/s-11 m/s)
A 3-φ standalone wind-diesel hybrid system using PMSG along with BESS has been simulated in MATLAB using Simpower system tool boxes. Various components have been designed for the hybrid system and controller’s satisfactory performance has been depicted using 1-φ-D-Q theory with SOGI filters for various loads under dynamic conditions while maintaining constant voltage at PCC and balanced source currents of diesel generator and also for harmonics suppression as per guidelines of IEEE-519-1992 standard. A mechanical sensor less approach has been used for achieving MPPT through incremental conductance technique.
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