Dynamic Performance Enhancement of Three-Phase PV Grid-Connected Systems Using Constant PowerGeneration (CPG)
Surmount demand requirement in electrical energy has given a provision of integrating renewable energy to the three-phase grid-connected system. In particular, the penetration of distributed generation system has contributed more in electrical power gener
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MPPT–Maximum power point
R. Kasthuri K. Bhageeratha Reddy J. Prasanth Ram T. Sudhakar Babu N. Rajasekar (&) Solar Energy Research Cell, School of Electrical Engineering VIT University, Vellore, India e-mail: [email protected] R. Kasthuri e-mail: [email protected] K. Bhageeratha Reddy e-mail: [email protected] J. Prasanth Ram e-mail: [email protected] T. Sudhakar Babu e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2017 S.S. Dash et al. (eds.), Artificial Intelligence and Evolutionary Computations in Engineering Systems, Advances in Intelligent Systems and Computing 517, DOI 10.1007/978-981-10-3174-8_17
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1 Introduction With increased production cost and uncertain by its availability, the conventional energy resources are decaying day by day. On the other hand, renewable energy power generation has become an important assert to solve the expected future demand. The key advantage of using renewable energy source is zero maintenance in exhaustibility, reliability, zero noise available at free of cost, empowerment of residential application using solar and wind power generation [1]. With a vision of extending these sources to grid-connected system, the authors have proposed a scholarly research in solar PV grid-connected systems. To be specific, solar installed capacity in 2014 is 185 MWp and planed to contribute 12,500 MW to the power demand of India till 2016–2017 [2]. This shows the future reliability on solar power generation is increasing year by year. With wide scope of extending PV system to grid-connected applications. The certain factors like: (1) switching losses of inverter due to intermittency resulting in lifetime of semiconductor switches, (2) Instability in grid loading conditions under peak power, and (3) Restricted utilization of PV inverter has encouraged the researchers to introduce constant power generation (CPG) in PV grid-connected applications. Understanding the importance of DG system, In [3] a general overview on DG involving PV, fuel cell, and wind generation systems are interfaced with grid and an interior discussion in design of controller is addressed. In [4], a closed-loop control of PV interfaced with interleaved boost converter is designed. This paper provides a two-stage conversion for a grid-connected PV system. Further, a high voltage gain is introduced to meet the grid requirement. However, these methods have not utilized the MPPT mode in PV and results with higher power loss when connected to grid. Understanding the problem, a new method of low voltage grid integration is proposed in [5]. A new regulation involving 70% of active power feed-into the grid is considered with irrespective of reactive power flow. However, the techniques discussed above has suffered from thermal stresses on switches and subjected to overloading conditions on grid. In general, despite of the dynamic overloading condition the PV grid-connected system should be capable of operating at both reduced power mode (RPM) and
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