A Comparative Performance Analysis of a Novel Single Stage Three Port Converter for PV Storage Syste

IJSTE - International Journal of Science Technology & Engineering | Volume 3 | Issue 04 | October 2016 ISSN (online): 2349-784X

A Comparative Performance Analysis of a Novel Single Stage Three Port Converter for PV Storage Systems S. Rajeswari Associate Professor Department of Electrical & Electronics Engineering Info Institute of Engineering Coimbatore, Tamil Nadu

Dr. Rani Thottungal Professor & Head Department of Electrical & Electronics Engineering Kumaraguru College of Technology Coimbatore, Tamil Nadu

Abstract This research work is mainly spotlight to prove and evaluate the performance of a novel three port converter by interfacing a PV port, a battery port, and a load port simultaneously in a power system then a new three port converter named bidirectional buck with buck boost converter(B4C) is proposed. The major benefit of the proposed converter topology is the single-stage power conversion which improves the overall efficiency of the converter. The performance of the proposed system is simulated in MATLAB and its usefulness based on overall component count, losses and efficiency is evaluated. Finally to confirm the best of the proposed converter, it is compared with other conventional converters such as boost bidirectional buck converter (B3C), conventional Single Ended Primary Inductance Converter (SEPIC) and ZETA converter. The comparison results prove the dynamic performance of the proposed topology.

Keywords: PV Powered Storage, Power Flow Management, Performance Analysis, Single Stage Power Conversion, Three Port Converter ________________________________________________________________________________________________________ I.

INTRODUCTION

The fast change in global energy stress and the environmental problems caused by fossil fuels have resulted in the need of solar energy which becomes a potential solution and one among the most accepted renewable energy sources. Solar power is utilized in areas where standard power supply is not available. The recent tendency is to focus on the PV battery powered backup system[11] in order to meet the required load demand. In such cases, an efficient converter is necessary to maintain the power demand within the limit of the maximum availability and also to prevent other failures. Onwuchekwa & Kwasinski [10] presented a new, and simple approach based on buck-boost converter topology. But, the proposed converter has a non-uniform power flow path between battery and load port when the battery is connected for charging and discharging. So, this system is not appropriate for a PV-battery backup structure. Chen & Yen-Mo et al. [2] presented a novel boost converter with high voltage gain based on the technique of three stable communication cell. Hence, by implementing this concept a DC bus along with a PV panel array is used. This permits the batteries to charge simultaneously based on the intensity of solar radiation. But it was found that the design of proposed system was difficult due to more number of semiconductor power devices used in the system. The current conduction losses occurring during battery charging and discharging are more and hence the attainment of higher efficiency is difficult. To diminish these problems,[15] a novel single stage three port DC/DC converter named boost bidirectional buck with buck boost converter (B4C) is proposed. Then the proposed topology is used for interfacing a battery port, a PV port and a load port simultaneously in a power system. The dynamic performance of B4C is evaluated based on three domain distribution control method II. PROPOSED METHODOLOGY The proposed B4C schematic diagram is given in Fig 1. It primarily consists of boost converter and bidirectional buck with buck boost converter (B3C). Here, the input inductor (L1 ), diode (D1 ) and switch (S1 ) (boost converter) is utilized for extracting the maximum power from PV panel by making use of maximum power point tracking (MPPT) algorithm[7].

In addition, B4C arrangement comprising of diode (D2 ), buck boost inductor (L2 ), switch (S2 ), buck inductor (L3 ), standalone battery powered backup supply and output capacitor (C0 ).Here, B4C is engaged for maintaining the constant output voltage (VL ) arising due to mismatch between the production and demand. When the demand goes beyond than generation, (VL ) drops from its reference value, subsequently battery will discharge in order to provide for the additional demand. Just like that, when the demand is less than generation, (VL ) increases over its reference value, and then consequently the battery will charge in order to absorb the additional power. Buck–boost converter is utilized as a bidirectional converter for the purpose of enabling the bidirectional power flow between load and battery [12].

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A Comparative Performance Analysis of a Novel Single Stage Three Port Converter for PV Storage Systems (IJSTE/ Volume 3 / Issue 04 / 019)

The main achievements of this proposed B4C are as given: 1) Current is in discontinuous conduction mode for civilizing the reliability of the battery. 2) Due to the single-stage power conversion the efficacy of the converter gets highly superior. 3) For decreasing the current conduction losses the converter is designed with least number of components [5,6]

Fig. 1: Proposed B4 converter schematic diagram

III. SIMULATION OF PROPOSED CONVERTER B4C The performance of the proposed B4C is modelled in a matlab / Simulink environment making use of the Sim Power-System Toolbox. The proposed converter performance is analyzed under dynamic solar irradiation conditions [13]. Parameters like Panel power(PPV ), Load power(PL ), Battery power(PBAT ), Load voltage(VL ), then (iL1 ), (iL2 )and(iL3 )current flowing through the inductorsL1, L2 L3 respectively, and then finally state of charge in the battery (SOC) of the proposed converter are assessed in order to show its proper functioning. The converter input and output specifications employed for the simulations are provided in Table 1.

Fig. 2: Simulation diagram of proposed B4C

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A Comparative Performance Analysis of a Novel Single Stage Three Port Converter for PV Storage Systems (IJSTE/ Volume 3 / Issue 04 / 019)

Fig. 3: Simulation result of proposed B4C

IV. COMPARATIVE PERFORMANCE ANALYSIS OF B4C The proposed converter B4C is compared with other conventional converters such as boost bidirectional buck converter (B3C), conventional Single Ended Primary Inductance Converter (SEPIC) and ZETA converter [9] in conditions of efficiency, minimal number of power devices used and current conduction losses. The comparative analysis is indicated in Table 2 . From the Table 2, it is obvious that the proposed B4C performance is better in terms of efficiency, component count and losses, when compared with other conventional converters [1,3].

Table – 1 B4C topology simulation specifications Parameter value 180W PV panel design specification 5.48 A Short circuit current at reference condition Isc 43.6 V Open circuit voltage at reference condition Voc 35.8 V MPP voltage at reference condition Vmp 5.03 A MPP current at reference condition Imp 0.1133 Series resistance Rs 1000 W/m2 Irradiance at standard test conditions (STC) 25 _C Cell temperature at standard test conditions 180W Maximum power @ STC Table – 2 Comparative analysis of B4C with conventional converters No of power devices used Configuration Average Current conduction Losses(w) S D L C Total Conventional B3C 3 3 3 2 11 53.74 Conventional SEPIC 2 5 2 2 12* 56.52 ZETA converter 1 1 2 2 8* 52.63 Proposed B4C 2 2 3 1 8 43.69

% Efficiency 94.2 91.4 93.2 97.3

* including resistance V. CONCLUSION This research work presents a comparative performance analysis of a novel three port converter B4C, to prove and evaluate the dynamic performance of the proposed system. The proposed topology produces enhanced performance in component count, efficiency and average current conduction losses when compared with other conventional converters and it is evident that the proposed B4C performance is superior when compared with other conventional converters. The proposed topology can be applied in several applications such as PV powered backup system, electric vehicles, street light, micro inverter system, and so on. Applying the above concept to PV storage systems is our future work.

REFERENCES [1] [2]

Abbas, G, Abouchi, N, Sani, A & Condemine, C 2011, ‘Design and analysis of fuzzy logic based robust PID controller for PWM-based switching converter’, in 2011 IEEE Int. Symp. on Circuits and Systems (ISCAS), Rio de Janeiro, pp. 777-780.

Chen, Yen-Mo, Alex Q Huang & Xunwei Yu 2013, ‘A high step-up three-port dc–dc converter for stand-alone PV/battery power systems’, IEEE Transactions on Power Electronics, pp. 5049-5062.

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A Comparative Performance Analysis of a Novel Single Stage Three Port Converter for PV Storage Systems (IJSTE/ Volume 3 / Issue 04 / 019) [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]

Di Napoli, A, Crescimbini, F, Solero, L, Caricchi, F & Capponi, FG 2002, ‘Multiple-input dc-dc power converter for power-flow management in hybrid vehicles’, Industry Applications Conference, 2002. 37th IAS Annual Meeting. Conference Record of the IEEE, vol. 3.

Di Napoli, A, Crescimbini, F, Solero, L, Caricchi, F & Capponi, FG 2002, ‘Multiple input DC-DC power converter for fuel-cell powered hybrid vehicles’, Power Electronics Specialists Conference, 2002. pesc 02. 2002 IEEE 33rd Annual, IEEE, vol. 4.

Dobbs, Bryan G & Patrick L Chapman 2003, ‘A multiple-input DC-DC converter topology’, IEEE Power Electronics Letters, vol. 1, no. 1, pp. 6-9.

Elgendy, Mohammed A, Bashar Zahawi & David J Atkinson 2012, ‘Assessment of perturb and observe MPPT algorithm implementation techniques for PV pumping applications’, IEEE transactions on sustainable energy, pp. 21-33.

Ismail, NN, Hashim, N & Baharom, R 2011, ‘A comparative study of proportional integral derivative controller and fuzzy logic controller on DC/DC buck-boost converter’, in 2011 IEEE Symp. on Industrial Electronics and Applications (ISIEA), Langkawi, pp. 149-154.

Lembeye, Y, Bang, VD, Lefevre, G & Ferrieux, JP 2009, ‘Novel half-bridge inductive dc–dc isolated converters for fuel cell applications’, IEEE Transactions on Energy Conversion, pp. 203-210.

Mahdavi, Mohammad & Hosein Farzanehfard 2011, ‘Bridgeless SEPIC PFC rectifier with reduced components and conduction losses’, IEEE Transactions on Industrial electronics, pp. 4153-4160.

Onwuchekwa, Chimaobi N & Alexis Kwasinski 2012, ‘A modified-time-sharing switching technique for multiple-input DC–DC converters’, IEEE Transactions on Power Electronics 27.11, pp. 4492-4502 Sahin, ME & Okumus, HI 2012, ‘A fuzzy-logic controlled PV powered buck-boost DC-DC converter for battery-load system’, in INISTA 2012 Int. Symp. on INnovations in Intelligent SysTems and Applications, Trabzon, pp. 1-5.

Tseng, Kuo-Ching, Chi-Chih Huang & Wei-Yuan Shih 2013, ‘A high step-up converter with a voltage multiplier module for a photovoltaic system’, IEEE transactions on power electronics, pp. 3047-3057.

Wang, Zhan & Hui Li 2013, ‘An integrated three-port bidirectional DC–DC converter for PV application on a DC distribution system’, IEEE Transactions on Power Electronics, pp. 4612-4624.

Zeng, Jianwu, Wei Qiao, Liyan Qu, and Yanping Jiao. ‘An isolated multiport DC–DC converter for simultaneous power management of multiple different renewable energy sources’, IEEE Journal of Emerging and Selected Topics in Power Electronics, pp. 70-78.

Zhu, Hongyu, Donglai Zhang, Bowen Zhang, and Zhicheng Zhou. 2015, ‘A Nonisolated Three-Port DC–DC Converter and Three-Domain Control Method for PV-Battery Power Systems’, IEEE Transactions on Industrial Electronics 62.8, pp. 4937-4947.

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