Permanent Magnet Synchronous Generator Based Wind Energy and DG Hybrid System

ABSTRACT:

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.

KEYWORDS:

1.      WECS

2.      Diesel Generator

3.      Single-Phase D-Q theory

4.      Power Quality

5.      MPPT

SOFTWARE: MATLAB/SIMULINK

 SCHEMATIC DIAGRAM:

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)

 CONCLUSION:

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.

REFERENCES:

 [1] Bin Wu, Y. Lang, N. Zargari, and Samir Kouro, Handbook of Power Conversion and Control of Wind Energy Systems, John Wiley and Sons, Hoboken, New Jersey, 2011.

[2] B. Singh, and R. Niwas, “Power quality improvements in diesel engine driven induction generator system using SRF theory,” in Proc. of IEEE  Fifth Power India Conference, 2012, pp.1,5, 19-22 Dec. 2012.

[3] B. Singh, and J. Solanki, “Load Compensation for Diesel Generator Based Isolated Generation System Employing DSTATCOM,” in Proc. of IEEE International Conference on Power Electronics, Drives and Energy Systems, 2006, PEDES '06, pp.1-6, 12-15 Dec. 2006.

[4] S. Sharma, and B. Singh, “An autonomous wind energy conversion system with permanent magnet synchronous generator,” in Proc. Of Inter. Conf. on Energy, Automation, and Signal (ICEAS), 2011, pp.1-6, 28-30 Dec. 2011.

[5] P.K. Goel, B. Singh, S.S. Murthy, and N. Kishore, “Autonomous hybrid system using SCIG for hydro power generation and variable speed PMSG for wind power generation,” in Proc. of Inter. Conf. on Power Electronics and Drive Systems, PEDS’ 2009, pp.55-60, 2-5 Nov. 2009.