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IRJET- Design of Photovoltaic System using Fuzzy Logic Controller
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1400 Design of Photovoltaic System using Fuzzy Logic Controller M. Khallaf1, A. Ismail2 1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE 2Professor, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract -This paper assesses the use of Fuzzy logic Controller in a standalone Photovoltaic (PV) system. The PV system was designed and simulated using MATLAB/Simulink where an array of Sun Power SPR-440NE-WHT-D solarpanels was connected to a boost DC-DC converter. The number of parallel strings along with the number of series modules in each string of the PV panel have been designed to produce an output power of 150 KW at standard testing conditions (STC). The controller was assessed in terms of dynamic response, output power efficiency, and output ripples. These variables were tested under two scenarios; the first under fixed weather conditions and the second under varying weather conditions. Key Words: Renewable Energy, PV, MPPT, and Fuzzy Logic 1. INTRODUCTION TO FUZZY LOGIC Fuzzy logic is considered a type of many-valued logic (MVL) otherwise called non-classical logic. They are a form of logic that do not constrain the output truth-values to only two but accept the range of values in between as well [1]. This means that it is not restricted to binary values of “0” and “1” or “True” and “False”, but operates as well in the grey area in between allowing for a more accurate indication of the variable. Another unique attribute that fuzzy logic has is the use of linguistic interpretation instead of numerical, which makes it closer to the human thought process. When Lukasiewicz and Tarski introduced infinite-valued logic in 1920 and when Lotfi Zadeh perfected it andintroducedfuzzy Logic in 1965, the aim was to create a new framework that is not only black and white [2]. 1.1 FUZZY SETS AND MEMBERSHIP FUNCTIONS Fuzzy logic is a unique method thattransformsmathematical equations into a set of linguistic commands which is done using two crucial concepts: fuzzy sets and membership functions. Fuzzy sets are a group of sets where the numerical data gets allocated to, and by doing so it transforms numerical values intolinguisticones.Fuzzysetsaresimilarto the Mathematical concept of having a universe of discourse, where a universe defined as Z contains all the values and the data are grouped. A simple example of a fuzzy set would be creating three sets called low, medium, and high, used to divide and group the available numerical data into these sets using the second concept, which is the membership function. The membership function is a tool developed through the experience of the user and is used to assess the degree to which this value belongs to acertain set and is evaluatedona scale of zero to one. As shown in Figure 1, the triangle shape represents the membership function which is bound by zero and one, where zero means that the variable does not belong to the set at all and one means that it the variable entirely belongs to the set. Fig -1 Membership Function Diagram [3] 1.2 FUZZY RULES AND REASONING A fuzzy set can be adapted and tailored towards any application and that is due to the fuzzy rules that are embedded in each of the sets. A fuzzy rule is a statement developed by the user of the logic based on the knowledgeof the industry experts to determine the output based on the input variables. These rules are formulated as conditional statements that utilize the “if” and “then” arguments along with somelogic gates as wellsuch as “and”, “not”and“or”[4]. The rules were built in such a way to mimic the day-to-day human reasoning that is being done naturally such as “IF room temperatureislowTHENswitchtheair-conditioningto low.” In this conditioning statement, the “if” and “then” argument was used to figureout the output and input. In this case, the output is the air-conditioning fan levelandtheinput is the room temperature. The final elements of the rule are the fuzzy sets that represent both the input and the output values, which in this case areboth called low. A general fuzzy rule should look like Equation 1: IF X is FS THEN Y is FS (1) Where: X is the input measured variable. FS is the Fuzzy Set assigned to each variable. Y is the output measured variable.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1401 Equation 1 is the most general and simplified version of the fuzzy rule but as the application gets more and more complicated slight changes can be noticed on the rulesuchas the number of inputs, the number of outputs, and finally the number of conditions in the rule. Now that the fuzzy rules have been explained,thenextpartis to understand how the userprogramsthesetoffuzzyrulesso that fuzzy logic can calculate the output from the value of the input variables. Figure 2 is what a typical set of fuzzy rules look like once the user has programmed it. The figure shows the nine rules of the fuzzy rule design of a nonlinear process that has three membershipfunctions,twoinputvariablesand one output [5]. There are two input variables, which are the error signal and the change in the error signal. Secondly, the three membership functions represent the variables that have been transformedfromnumericaltolinguisticstate.The three membership functions are N, Z, and P respectively, which as stated in the figure refer to negative, zero, and positive. Finally, the output can be denoted by threedifferent values, which are: small, medium, and big, or S, M, and B respectively. The output can be calculated by figuringoutthe intersection point between the two inputsortheintersection of the rows and columns. Fig -2 Fuzzy Rules [4] 1.3 METHOD OF OPERATION Figure 3 describes the method of operation of a fuzzy logic controller through the use of a flowchart. The controller starts by setting an initial value for the duty cycle and then measures the values of both the PV output voltage and current. The PV output voltage and current values are then used as input signals to the FLC MPPT controller to calculate the power output. Furthermore, the measured value of the voltage along with the calculated value of the power areused to calculate the value of the error and the change in error between the inputs of the current and previous cycles. Both the error and the change in error can be calculated by using Equations 2 and 3 shown below: Figure -Error! No text of specified style in document. FLC Design Flowchart [6] (2) Where: E(k) is the error signal value Pin(k) is the current cycle’s power value Pin(k-1) is the previous cycle’s power value Vin(k) is the current cycle’s voltage value Vin(k-1) is the previous cycle’s voltage value (3) Where: E(k) is the current cycle’s error signal value E(k-1) is the previous cycle’s error signal value Once the error and the change in the error values are calculated, the fuzzy logic process shown in Figure 3 starts. The controller takes these two values in as crisp inputs and changes them into linguistic values corresponding to their fuzzy set label, which is the fuzzification process. The inference engine in the controller then calculates the output decision based on the inputs it receivesfromthefuzzifierand the fuzzy rules the user has installed in the knowledge base. The de-fuzzifier thentransformsthereceivedoutputdecision from linguistic to numerical or crisp value. This numerical value is the change in the duty cycle required to have the output at the MPP. Thus, the new duty cycle is equivalent to the old duty cycle plus the change in duty cycle calculated. The change in duty cycle can either be positive or negative depending on the required final duty cycle as shown in Equation 4:
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1402 (4) Where: D(k) is the new cycle’s duty cycle ratio (0 D(k) 1) D(k-1) is the previous cycle’s error signal value is the calculated change required in duty cycle (-1 1) 1.4 ADVANTAGES & DISADVANTAGES OF FLC The popularity and usage of fuzzy logic have been increasing steadily ever since Zadeh created it in 1965. Nevertheless, Proportional Integral Derivative (PID) isstillthemostwidely used control logic. This section will clarify this usage by presenting the advantages and drawbacks of fuzzy logic control. There are numerous advantages to using fuzzy; however,the main one that stands out is the user-friendly logic. The concept that fuzzylogic was built on was tomimicthehuman thinking process, which is why fuzzy logic transforms numbers into language and the rule base is configured by sentences instead of mathematicalequations.Thus,makingit not only much more convenient for the users but also faster to program. Another major advantage is that unlike other controllers, fuzzy logic has the ability to work withimprecise mathematical models or onesthat are approximatedandstill provide an efficient output. Fuzzy logic is consistent and robust even during frequently fluctuating applications such as the weather condition with solar panels. Finally, fuzzy logic is capable of working in parallel with other control techniques such as PID or state feedback [7]. On the other hand, like any other controltechnique,fuzzyhas its drawbacks. Firstly, compared to other commonly used methods, FLC is much more complex. The common techniques require the usage ofoneormoresensorsandthus they are simpler to use. Moreover, higher complexity translates into higher cost of implementation. Another drawback is when an accurate mathematical model of a complex project is available; it tends to be easier and quicker to use a controller that utilizes this model instead of re- writing the model to conditional statements. In this case fuzzy would not be the optimum choice 2. PV SYSTEM DESIGN The PV system design as shown in Figure 4, starts with a Ramp-up/downmodulethatcontrolsandfluctuatesthevalue of the temperature and the irradiance to simulate real-life conditions. These values are fed to the PV array block, which produces a certain voltage and current depending on the specific values of thetemperatureandirradiance.Thevoltage and current values taken fromthePVarrayareusedasinputs to the MPPT controller while the output of the array is connected to a DC-DC Boost converter. The MPPT controller uses the input PV voltage and current value to continuously calculate the duty cycle, which is then fed to the boost converter. The boost converter controls the voltage level according to the duty cycle to continue tracking the Maximum Power Point at all times. Finally, the output of the boost converter is then connected to a resistive load, which acts as a demand side load for the stand-alone system. Figure -Error! No text of specified style in document. PV Solar System Design on MATLAB [8] 2.1 FUZZY LOGIC CONTROLLER DESIGN This controller is designed in a unique way as it utilizes linguisticrulesandfunctionsinsteadofmathematicalmodels. Figure 5 shows the proposed MATLAB design of the fuzzy logic controller used in this paper. The fuzzy logic controller has two inputs, which are theerror andthechangeinerroras calculated using Equations 2 and 3andhasoneoutput,which is the duty cycle. Figure -5 Simulink/MATLAB Fuzzy Logic MPPT Controller
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1403 3. DISCUSSION AND RESULTS This section will highlight theperformanceoftheFuzzyLogic controller under two separate scenarios. Inthefirstscenario, the panel will be subjected to a constant solar irradiance of 1000 W per square meter and will have a constant internal temperature of 25 degrees Celsius as shown in Figure 6. This allows for a simple and reliable demonstration of the algorithms’ performance in terms of accuracy and speed to get the desired power output, which is 150 kW. 999 999.5 1000 1000.5 1001 Thesis_1/Irradiance Temp : Ramp-up/down Irradiance Ir 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Time (sec) 24 24.5 25 25.5 26 Temp Figure -6 Constant Irradiance and Temperature Signals Figure 7 illustrates the second scenario where the panel is subjected to variable irradiance and variable temperature to document the behavior of each algorithm whenexperiencing conditions similar to those in real life. The irradiance will vary from 1000 W per square meter to 250 W per square meter and the temperaturewill vary from 25 degreesCelsius to 50 degrees Celsius. There is alsoaperiodoftimewherethe temperature is constant and the irradiance is changing and vice versa and the reason behind that is to capture the effect of each of these variable on the output power separately. Period A represents a fixed value of irradiance and temperature at 1000 W per square meter and 25℃ respectively. In Period B the temperature remained unchanged, however, the irradiance dropped from 1000 to 250 W per square meter and remained this way from the 1.7-second mark until 2.5 seconds. Period C commenced after the 2.5 second mark, increasing the voltage back to 1000 W per square meter. Finally, in period D, the first change in the temperature is witnessed from 25 ℃ to 50 ℃ with an irradiance of 1000 W per square meter. 0 500 1000 Thesis_1/Irradiance Temp1 : Ramp-up/down Irradiance Ir 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Time (sec) 20 30 40 50 Magnitude Temp A B C D Figure -7 Varying Irradiance and Temperature Signals 3.1 SCENARIO 1: CONSTANT IRRADIANCE AND TEMPERATURE Figure -8 Output Power Under Constant Conditions Using FLC MPPT The step response of the output power using fuzzy logic controller in Figure 8 results in a rise time of the output power of about 0.198 seconds and settling timeof about0.26 seconds. Moreover, the output power reaches a maximum value of about 148,100 W at time 4.675 seconds. However, the mean value of the output power is 148,000 W and when compared to the targeted output power, which is 150,000W, results in an output efficiency of about 98.66% for the FLC. Figure 9 is divided into 5 plots under constant weather conditions, which are: the duty cycle (DC), the PV output voltage, PV output current, system output voltage, and current on the load side. The first threegraphsoscillateatthe very beginning until they reach their steady state value at timeof about 0.3 seconds. The steady statevalues are:0.9for the DC, 452 Volts for the PV voltage, 326.2 Amperes for the
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1404 PV current, 2106 Volts for the output system voltage, and 70.2 Amperes for the output system current. Figure -9 FLC DC, Voltage, and Current Diagrams Under Constant Conditions 3.2 SCENARIO 2: VARYING IRRADIANCE AND TEMPERATURE Figure -10 Output Power Under Varying Conditions Using FLC MPPT In Figure 10, period A is where the irradiance is 1000 W per square meter and the module temperature is 25 ℃. The output power curve increasesherefromzeroto147,600Wof power. It then drops down to about 33,770 W in period B when the irradiance drops to 250 W per square meter and the temperature is kept constant. In part C, the irradiance increases again to 1000 W per square meter and thus the power output is close to that in part A, which is 147,200 W. Part C is done in preparation forpart D, where the irradiance is kept constant at 1000 W per square meter and the temperature increases from 25 to 50 ℃. This results in a power output drop from 147,200 W to 133,900 W. As expected, the drop in the irradiance causes the most deterioration in output power where the change from 1000 W per square meter to 250 W per square caused a 77.2% drop in the output power. On the other hand, the increase in temperature from 25 ℃ to 50 ℃ causes a percentage drop in power by about 9%. Table 1 demonstrates the efficiency levels calculated using Equation 5.1, which are: 98.0% in period A, 92.43%inperiod B, 97.74% in period C, and 98.97% in period D. FLC achieved staggering efficiency percentages across all four periods. Table -1: FLC Efficiency Percentages of each Period Per iod Irradia nce Value (W/m ^2) Temperat ure Value (℃) Actual Output Power (W) Theoretic al Output Power (W) Efficien cy Percent age % A 1000 25 147,600 150,600 98.00 B 250 25 33,700 36,460 92.43 C 1000 25 147,200 150,600 97.74 D 1000 50 133,900 135,300 98.97
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1405 Figure11 shows the Dutycycle values, PV outputvoltageand current, and the system output voltage and current. Regarding the PV’s voltage and current response,thecurrent is highly affected by the dropinirradiancefrom326Amperes to about a mean value of 75 Amperes and no change is observed during the increase in temperature. However, the PV voltage does not seem to be affected much by either change but is affected more by the temperature where it drops from 453 Volts in period A to 451 Volts in period Band 401 Volts in period D. The two final curves are of the load sidevoltage and currentwhichreactinthesamemannerthey start at with values of 2101 Volts and 70.04 Amperes respectively in period A, dropping to 1006 Volts and 33.5 Amperes in period B, increasing back up to 2101 Volts and 70.03 Amperes in period C, and finally slightly dropping to 2005 Volts and 66.8 Amperes in period D. Figure -11 FLC DC, Voltage, and Current Diagrams Under Varying Conditions 4. CONCLUSION This paper presented a Fuzzy Logic approach to modeling and simulating a photovoltaic system with a maximum power point controller. Fuzzy Logic was used because it is considered to be a high level controller. The PV system was designedandsimulatedusingMATLAB/Simulink togenerate a power output equivalent to 150 kW. Results of the modeling and simulation show a rise time of 0.198 seconds, settling time of 0.26 seconds, and a mean efficiency of 98.66%. The controller was subjected to four conditions of varied irradiance and temperature. ThroughoutPeriodsAto C, the temperature was kept constant at 25 degrees Celsius while the irradiance was varied. In Period D, the temperature is varied from 25 ℃ to 50 ℃. Results of the four conditions show that themaximum efficiencywasreachedin Period D, followed by Periods A, C, and finally B. REFERENCES [1] G. Siegfried, "Many-Valued Logic", The Stanford Encyclopedia of Philosophy (Winter 2017 Edition), Edward N. Zalta (ed.), Available: https://plato.stanford.edu/archives/win2017/entries/l ogic-manyvalued/. [2] D. Dubois, F. Esteva, L. Godo and H. Prade, FUZZY-SET BASED LOGICS — AN HISTORY-ORIENTED PRESENTATION OF THEIR MAIN DEVELOPMENTS, 8th ed. Elsevier BV, 2007. [3] B. Ankayarkanni and L. Ezel, "GABC based neuro-fuzzy classifier with multi kernel segmentation for satellite image classification", Biomedical Research, vol. 29, no. 21, 2016. Available: http://www.alliedacademies.org/articles/gabc-based- neurofuzzy-classifier-with-multi-kernel-segmentation- for-satellite-image-classification.html. [Accessed 14 January 2019]. [4] B. Singh and A. Mishra, "Fuzzy Logic Control Systemand its Applications", IRJET, vol. 2, no. 8, 2015. [Accessed 14 January 2019]. [5] J. Paulusová, "Fuzzy logic autotuning methods for predictive controller", Posterus.sk, 2010. [Online]. Available:http://www.posterus.sk/?p=7961.[Accessed: 14- Jan- 2019]. [6] N. Hussein Selman, "Comparison Between Perturb & Observe, Incremental Conductance and Fuzzy Logic MPPT Techniques at Different Weather Conditions", International Journal of Innovative Research in Science, Engineering and Technology, vol. 5, no. 7, pp. 12556- 12569, 2016. Available:10.15680/ijirset.2016.0507069 [Accessed 10 January 2019]. [7] N. de Reus, Assessment of benefits and drawbacks of' using fuzzy logic especially in fire control systems, 35th ed. TNO, 1994. [8] "Detailed Model of a 100-kW Grid-Connected PV Array- MATLAB & Simulink", Mathworks.com, [Online]. Available:
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1406 https://www.mathworks.com/help/physmod/sps /examples/detailed-model-of-a-100-kw-grid- connected-pv-array.html. [Accessed: 21- Jan- 2019]. BIOGRAPHIES Mohamed Khallaf Born in 1996. Graduated with a BSc in Electrical Engineering and a minor in Computer Engineering from the American University of Sharjah in 2016. Currently pursuing MSc in Electrical Engineering (in Control Systems) at RIT Dubai. Currently working as a Business Development Manager in the Energy sector in UAE for an international consulting firm. His research interests include Artificial Intelligence,Renewable Energy and Control Systems. Abdulla Ismail Professor of Electrical Engineering. Emirati citizen, Born in Sharjah. BSc (‘80), MSc (’83), and PhD (’86) in Electrical Engineering from University of Arizona, USA. 1st Emirati to hold a PhD in Engineering. Has over 30 years of teaching and research experience at UAE University (ALAIN) and RIT Dubai. Worked as Vice Dean of College of Engineering, Advisor to the Vice Chancellor at UAE University. Worked in Education and Technology management Dubai Silicon Oasis and Emirates Foundation. Teaching and research interests in Control and Power systems, intelligent systems, smart grids, renewable energy systems modeling and control. Coauthored two books; desalination technology in the UAE and Contemporary Scientific Issues. Published over 90 referred technical papers inlocal andinternational journals and conferences. Won Emirates Energy Award (Education and Energy Management), 2015. Won several UAEU awards for University and Community service. Won the Fulbright scholarship, USA Government.Aseniormemberof IEEE. A member of Dubai KHDA UniversityQuality Assurance International Board, Chair of the Zayed Future Energy Prize (Global High Schools Committee), Chairman of AURAK Engineering Advisory Council.
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