Power Point Of Solar Cell Research Articles

Analytical Modeling of the Temperature Sensitivity of the Maximum Power Point of Solar Cells

This article presents new analytical expressions for the temperature coefficients of the voltage, current, and power of a solar cell at its maximum power point (MPP). A new analytical expression of the temperature coefficient of the fill factor is also derived. The new expressions are written as functions of photovoltaic (PV) metrics that can be obtained from i-V measurements. Nonideal diode behavior is partially accounted for through a temperature dependent ideality factor. The recombination parameter <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\gamma$</tex-math></inline-formula> , which has been shown to account for the thermal sensitivity of all mechanisms determining the open-circuit voltage, appears to play a role also for the temperature coefficient of the MPP. The expressions are tested against experimental data, which covers measurements from 18 multicrystalline silicon solar cells with different bulk resistivities and cell architectures. It is found that the new model captures the essence of the temperature variation shown by the investigated PV metrics.

Modeling and simulation of dye-sensitized solar cell: Model verification for different semiconductors and dyes

In this article, the use of MATLAB/SIMULINK interface to realize a generalized photovoltaic simulation model is introduced. The model was created utilizing the photovoltaic (PV) cell fundamental circuit equations, including the effects of solar radiation and variations in temperature. This modeling approach enables the I–V and P–V curve of PV cells to be understood. It could also be used as a tool to forecast the behavior of any solar PV cell under differing environmental circumstances (e.g., temperature, irradiation conditions). These effects are simultaneously added in real-time. Due to their nonlinear features, they must be modeled to design and simulate the maximum power point of solar cells. This model applies to dye-sensitized solar cells with three different semiconductors, namely, TiO2, ZnO, and SnO2; use N3 dye. According to changes in atmospheric parameter values such as solar radiation, temperature, and operating parameter values like semiconductor type, dye concentration, and particles, the characteristic dimensions of photovoltaic systems such as power supply voltage (PV) and current–voltage (I-V) characteristics are drawn; in the MATLAB/SIMULINK interface observed. The simulation results reveal that these elements and the respective photovoltaic model affect the maximum operating performance of PV modules. The battery made of TiO2 semiconductor and N3 dye showed the greatest consistency with the model battery, followed by the battery made of ZnO, and finally, the battery made of SnO2 with the same dye N3.

Research on Control Simulation of Photovoltaic Power Generation System Based on MPPT

Output power of photovoltaic cell will change along with the change external environment and load. In order to give full play to the photovoltaic device efficiency and response external environment change fast, A maximum power point tracking circuit is need to be used. In this paper power voltage curve of photovoltaic cell is analyzed exactly. According to the analyzed results, the fuzzy control is applied into maximum power point tracking control of photovoltaic power generation system. This approach can make system working in the maximum power point without interfering with the normal work of the system. It improves that system stability. The simulation results prove that this approach can track the maximum power point of solar cell quickly and accurately.

Extraction of maximum power point in solar cells using bird mating optimizer-based parameters identification approach

Maximum power point of solar cells can be extracted by knowing the values of the electrical parameters. The validity of the obtained result depends on the accuracy of the model parameters. Hence, it is important to use a superior optimization technique to identify the optimal values of the parameters. Recently, a metaheuristic optimization algorithm, bird mating optimizer (BMO), has been devised which tries to metaphorically imitate the mating strategies of bird species. BMO employs several searching patterns to explore the region under consideration. This ability helps the algorithm to maintain the diversity and avoid premature convergence, and therefore, get close to the global solution. In this paper, the electrical parameters of a 57mm diameter commercial (RTC France) silicon solar cell are identified using BMO. The optimal parameters are then used to extract the maximum power point of the system. The accuracy of the proposed parameter identification approach is compared with the results found by the other optimization techniques. Simulation results accentuate the superior potential of BMO algorithm.

병실 냉.난방을 위한 초퍼와 PWM 전압형 인버터를 이용한 계통 연계형 태양광 발전시스템에 관한 연구

태양전지는 일사량, 온도와 부하에 의해 크게 변동하기 때문에 가능한 한 많은 에너지를 얻기 위해서는 태양전지의 출력을 항상 최대로 제어할 필요가 있다. 태양전지의 출력은 직류이므로 교류부하에 적용하기 위해서는 전력변환장치 중 인버터가 필수적이며 단위 역률을 갖는 정현파 전류 및 전압을 부하계통에 공급해 주어야 한다. 본 논문에서는 태양광 발전시스템을 승압 쵸퍼와 단상 PWM(Pulse Width Modultion) 전압형 인버터로 구성하였고, 안정된 변조를 위해서 동기신호와 제어신호를 원칩 마이크로프로세서에 의해서 처리하였다. 전력비교에 따라 시비율을 변화시키지만 태양전지는 전형적인 수하특성을 갖고 있어, 일사량과 온도변화에 관계없이 항상 최대 출력 점을 추적하도록 승압초퍼를 제어하였다. 단상 PWM 전압형 인버터는 태양전지가 연속 발전할 수 없는 단점을 보완하기 위해 일반 상용전원과 연계함으로써 약 $10{\sim}20%$ 전력절감효과를 얻을 수 있는 에너지절약 전원복합형 전력변환장치로 구성되어 있다. 단상 PWM 전압형 인버터와 위상동기를 위해서 계통전압을 검출하여 계통전압과 인버터 출력을 동상 운전하므로 잉여전력을 계통과 연계할 수 있게 하여 고 역률과 저고조파 출력을 유지 하므로써 부하와 계통에 전력이 안정하게 공급될 수 있도록 제어하였다. 【The solar cells should be operated at the maximum power point because its output characteristics were greatly fluctuated on the variation of insolation, temperature and load. It is necessary to install an inverter among electric power converts by means of the output power of solar cell is DC. The inverter is operated supply a sinusoidal current and voltage to the load and the interactive utility line. In this paper, the proposes a photovoltaic system is designed with a step up chopper and single phase PWM voltage source inverter. Synchronous signal and control signal was processed by one-chip microprocessor for stable modulation. The step up chopper is operated in continuous mode by adjusting the duty ratio so that the photovoltaic system tracks the maximum power point of solar cell without any influence on the variation of insolation and temperature for solar cell has typical dropping character. The single phase PWM voltage source inverter is consists of complex type of electric power converter to compensate for the defect, that is, solar cell cannot be develop continuously by connecting with the source of electric power for ordinary using. It can be cause the efect of saving electric power, from 10 to 20%. The single phase PWM voltage source inverter operates in situation, that its output voltage is in same phase with the utility voltage. The inverter are supplies an ac power with high factor and low level of harmonics to the load and the utility power system.】

Microprocessor-Controlled New Class of Optimal Battery Chargers for Photovoltaic Applications

A simple, fast and reliable technique for charging batteries by solar arrays is proposed. The operating point of a battery is carefully forced near the maximum power point of solar cells under all environmental (e.g., insolation, temperature, degradation) conditions. Optimal operation of solar arrays is achieved using the Voltage-Based Maximum Power Point Tracking (VMPPT) technique and the charger operating point is continuously adjusted by changing the charging current. An optimal solar battery charger is designed, simulated and constructed. Experimental and theoretical results are presented and analyzed. The main advantages of the proposed solar battery charger as compared with conventional ones are shorter charge time and lower cost.