PV BALANCERS: CONCEPT, ARCHITECTURES, AND REALIZATION

 

ABSTRACT:

This paper presents a new concept of module integrated converters called PV balancers for photovoltaic applications. The proposed concept enables independent maximum power point tracking (MPPT) for each module, and dramatically decreases the requirements for power converters. The power rating of a PV balancer is less than 20% of its counterparts, and the manufacturing cost is thus significantly reduced. In this paper, two architectures of PV balancers are proposed, analyzed, realized, and verified through simulation and experimental results. It is anticipated that the proposed approach will be a low-cost solution for future photovoltaic power systems.

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

Architecture I of PV balancers

(a) Architecture I of PV balancers

Architecture II of PV balancers

(b) Architecture II of PV balancers

Figure 1. Two possible architectures of PV balancers

 

EXPECTED SIMULATION RESULTS:

Output voltages of PV balancers in Architecture I

Figure 2. Output voltages of PV balancers in Architecture I

Output voltages of PV balancers in Architecture II

Figure 3. Output voltages of PV balancers in Architecture II

 

CONCLUSION:

A new concept of module-integrated converters called PV balancers has been proposed and verified in this paper. The proposed concept enables independent maximum power point tracking (MPPT) for each module, and dramatically decreases the requirements for power converters. PV balancers may have a significant economic value for photovoltaic systems in the future. Future work will be focused on power converter optimization, dc bus voltage control, and developing a highly efficient inverter for PV balancers.

REFERENCES:

  1. Kjaer, J. Pedersen and F. Blaabjerg, “A review of single-phase grid-connected inverters for photovoltaic modules,” IEEE Trans. Ind. App., vol. 41, no. 5, pp. 1292-1306, Sept. 2005.
  2. Linares, R. Erickson, S. MacAlpine, and M. Brandemuehl, “Improved energy capture in series string photovoltaic via smart distributed power electronics,” APEC’09, pp. 904-905, 2009.
  3. “Power circuit design for solar magic sm3320,” Application Note AN-2124, National Semiconductor, 2011.
  4. Trubitsyn, B. Pierquet, A. Hayman, G. Gamache, C. Sullivan, and D. Perreault, “High-efficiency inverter for photovoltaic applications,” ECCE’10, pp. 2803-2810, Sept. 2010.
  5. Pierquet, and D. Perreault, “A single-phase photovoltaic inverter topology with a series-connected power buffer,” ECCE’10, pp. 2811- 2818, Sept. 2010.