Evolutionary Algorithm Based Z-Source DC-DC Boost Converter for Charging EV Battery

P. Anitha; K. Kumar; M. Ravindran; A. Saravanaselvan

doi:10.32604/iasc.2022.025396

1Department of Electrical and Electronics Engineering, University VOC College of Engineering, Tuticorin, 628008, India
2Department of Electrical and Electronics Engineering, National Engineering College, Kovilpatti, 628503, India
*Corresponding Author: K. Karthik Kumar. Email: karthikpapers2021@gmail.com
Received: 22 November 2021; Accepted: 18 January 2022

Abstract: In this paper, efficient charging of electric vehicle battery from a considered renewable solar photovoltaic source with the help of a modified Z source with efficient boosting topology. Adapting this Z-source converter to act as a voltage gainer with a boosting function allows a solar Photovoltaic (PV) input voltage of 25VDC (Volts Direct Current) to be increased to a designed output voltage of 75VDC at a low duty ratio, resulting in minimal switching loss. The closed-loop steady-state and transient parameters at the output were analyzed and compared using modern evolutionary algorithms. The power range upheld throughout the circuit is around (300–350) W. The battery is assumed to have an impedance model of Resistor-Capacitor (RC) load with a serial range of 12 V and 7 Ah. The proposed converter achieves higher conversion efficiency by the Maximum Power Pont Tracking (MPPT) and NSGA-II/MNSGA-II (non-dominated sorting genetic algorithm) based controller algorithm for tuning the optimal design value and is validated in a MATLAB Simulink platform. In this work, we analyze closed-loop systems under the mentioned power range. The MPPT with an algorithm-based controller tends to trigger the switch in the closed-loop system to get the optimized output. The Maximum Power Point (MPP) technique implemented is an incremental conductance method for extracting solar PV power and improving load performance. Consequently, the proposed evolutionary optimization algorithm steady-state ripple factor response of the proposed MNSGA-II has a lower output side, thus achieving around 98% of the controller implementation efficiency.

Keywords: Solar photovoltaic; voltage gainer; RC (resistive and capacitive load); parasitic circuit; NSGA-II; MNSGA-II

In today’s world, renewable energy plays a crucial role in electrical energy conversion systems. The research is towards achieving a highly efficient power conversion system while integrating with renewable energy sources. The various boost, buck, and buck-boost topologies were involved in this research analyzed with different control methodologies to prove its technical uniqueness. Most of the literature defines eliminating technical parameters like ripple current and voltage at the parasites present in the system by implementing various multi-objective evolutionary algorithm-based controllers. Thus, this could improve the reliability and efficiency of the system.

There are various evolutionary algorithms like Particle Swarm Optimization (PSO), Genetic Algorithms (GA), and Grey Wolf Optimizer (GWO) algorithm are used for tuning Proportional Integral Derivative (PID) controller gain parameters in the conventional boost converter for getting the better optimal solution and root mean square error (RMSE) values than the conventional PID controller for different load conditions [1,2]. However, the performance of the older boosting operation decreases due to the improper selection of capacitors and inductors. In [3], a switched type Z-source/Quasi Z source converter is employed with reduced passive components in the PV grid-connected system to achieve high gain at small duty with the conventional tuning techniques. In addition to PSO and GA, metaheuristic and tabu optimization is implemented to find the optimal gain values to obtain the constant output voltage for both loaded and non-loaded conditions [4]. With the help of the state-space averaging method, the reduced-order tuning parameters are derived for interleaved type Single Ended Primary Inductor Converter (SEPIC) converter to expand the dynamic performance of the scheme by using the genetic algorithm-based controllers [5]. The PI controller [6] is tuned by PSO optimization employed in a bridgeless Luo converter to get an optimum design to produce a high-efficiency output and the performance study is made between Zeigler Nicholas and PSO method [7].

In [8] a hybrid evolutionary-based algorithm is used in a photovoltaic system combined with a boost converter to improve the MPPT performance under partial shading conditions. Furthermore, the performance analysis between conventional PSO [9] and hybrid evolutionary algorithm (PSO and (differential evaluation) DE) is done. A model predictive control algorithm is proposed for an MPPT based photovoltaic system that reduces the overall system cost and makes it operate in an adaptive step size [10]. An improved interleaved boost converter exhibits low ripple output voltage using a PSO-based type III optimal controller that provides high efficiency during energy conversion [11]. A cost-effective fuzzy-based MPPT control in [12] provides high efficient energy conversion under various operating conditions for the entire scheme’s steady-state and transient analysis.

A non-dominated sorting genetic algorithm (NSGA-II) was implemented as a multi-objective Pareto optimal model for the metal mining process to improve the production efficiency and utilization rate [13,14]. The MPPT with differential evolution algorithm [15] is used in solar PV-assisted SEPIC converter for getting quick response under different partial shading [16] and load conditions [17,18]. The improved efficiency and low-cost system are achieved with the help of a power balancing point optimization algorithm for PV system assisted differential power processing converter [19]. The modular multilevel converter is injected with second and third-order harmonics using a multi-objective genetic algorithm for reducing voltage ripples at the capacitor in [20]. The cuckoo optimization algorithm is developed in a boost converter for tuning the PI controller and the outcomes are compared with conventional PI controller parameters [21]. The fractional type PID controller is digitally implemented and the results are compared with ordinary PID controller [22]. An optimized algorithm improves the complete system stability with a passive filter present in the Alternate Current-Direct Current (AC-DC) converter [23].

ZSBC is a converter that will operate in high voltage gain and high reliability compared to the existing converter [24]. High frequency and coupled inductors are used to increase the voltage gain of the Modified Z-Z-Score Boost Converter (MZSBC) [25–27]. As a result, the voltage gain has been enhanced while the duty cycle of the switch has not been limited. However, the duty cycle has been limited. Therefore, a combined switched-inductors switched-capacitor has been utilized to upgrade the converter. To overcome these limitations, the concept of Z-source was introduced in [28–31]. A high voltage gain is obtained by using three winding inductors and switched capacitors [32]. To eliminate the dead time production one stage conversion of impedance circuit is introduced in [33]. However, energy occurs due to variations in the charging and discharging process [34]. Therefore, the PI controller system efficiency is improved even if the system’s reference voltage varies [35].

Therefore, the problems caused by partial shading such as low voltage gain and drop in power level are tedious while integrating solar PV with a power conversion system [36] for charging a battery bank. To enhance the system performance, a proper PID controller with better gain parameters must be employed but, in the conventional boosting topology with PID controller [37] tuning design provides more ripple voltage at the output side, high switching losses and thus, resulting in the low efficiency of the system which is considered as the problem of multi-objective.

To eliminate those above problems, the Solar PV integrated MZSBC converter with MPPT and MNSGA-II multi-objective optimization is proposed which highlights the following objective:

a) The MZBC is designed to produce a high voltage gain at a small duty ratio and high frequency due to the presence of coupled inductor with reduced switching losses.

b) The incremental conductance MPP technique helps to improve the load side performance with derived maximum power from the PV.

c) The MPPT and MNSGA-II optimization are used to improve the PID controller optimal gain values, the system’s dynamic performance and reduce the integral square error, which causes the system to achieve high efficiency with low-efficiency ripples at the output side.

d) The PID tuned gain parameters and time domain specifications like rising time, overshoot, settling time, and steady-state error obtained from different optimization algorithms are compared with the proposed MNSGA-II algorithm to show its technical importance.

e) By considering the efficiency, duty ratio, and controller, a comparison is made between existing and proposed converter performance.

In general, converters are electrical devices that convert voltage from alternating current (AC) to direct current (DC). This modified Z-source converter has a unique boost-up converting system that boosts input low voltage source to the designed output voltage, it gains an outcome at minimum switching loss by having a better control technique. Fig. 1 depicts the architecture of the proposed converter where the solar PV is used for charging the EV battery with an MZSBC converter. PI controller triggers the switches by comparing the actual and reference values to generate an error signal. The controller gain values are tuned by MPPT and MNSGA-II optimization algorithm. The pulse width modulation is a power amplifier that accepts the low power input from the controller board and generates a high current drive input for the gate of a power MOSFET. The simulation and hardware setup are developed for the proposed topology.

Fig. 2 displays a closed-loop structure of the proposed converter which consists of solar PV, MZSBC, MPPT&MNSGA-II controller and RC load as battery impedance. The MZSBC comprises diode D1, an intermediate element between the PV and converter, coupled inductor La and Lb, connected through a capacitor element Ca and Cb, Switch SW for turn ON/OFF purpose and, the filter components LcCc respectively. The MPPT and MNSGA-II controller generates a pulse to trigger the switch Sw and provide maximum power to the load. The main moto of the Z source converter in the motor vehicle gives a high gain and it attains better performance and efficiency of 98% through evolutionary data. From this evolutionary algorithm boosts up DC low voltage to DC high voltage. Therefore it mainly focused on less switching loss using a modified Z-source DC-DC boost converter employing solar energy.

In Fig. 3 mode 1 operation, when switch Sw is ON, the diode will be reverse biased it will be an open circuit and the capacitors can charge the inductors; whether the circuit is in a shoot-through zero state.

In the mode 1 operation, there are the two voltage capacitors as voltage capacitor VCa and voltage capacitor VCb and input voltage as Vi. From the equation, the voltage across inductors is equal to voltage across the capacitor.

In Fig. 4 mode 2 operation diode D1 is ON and switch Sw is OFF. When the switch Sw is turned OFF, the voltage across it keeps increasing until the input diode. D1 is turned ON. So, the voltage across the switch is clamped. In this operation mode, the voltage across inductors La is induced across inductors Lb Therefore, capacitors Ca and Cb are charged in this operation mode. Furthermore, the capacitors Cc and the filter inductor Lc are charged in this mode.

As a result, the inductor current becomes zero and maintains the following switching action; therefore, this mode can isolate both the dc source and load,

The NSGA-II algorithm has advantages like elitism, non-dominated, ranking, and crowding distance, leading to rapid convergence to optimal solutions. The NSGA-II is developed in many kinds of literature. The modified NSGA-II is implemented to solve elitism, fast non-dominated sorting approach, and diversity along with the Pareto optimal search. However, lateral diversity is still unchanged and non-dominated solutions are distributed standardized to the Pareto front. To avoid this drawback dynamic crowding distance (DCD)-based modified non-dominated sorting genetic algorithm-II (MNSGA-II) was proposed to improve the distribution of non-dominated solutions [18].

The crowding distance is the value of a certain mean distance solution of its two neighboring solutions. Where CDi is the crowding distance of the ith solution; r is the number of objectives; fik is the kth objective value of the ith solution. However, the problem with this CD is the weak uniform diversity to find the optimum solution. Therefore, DCD (4) methods are included to avoid such a problem.

Individual variance (5) of the CDs with neighbors of the ith solution gives data about the different degrees of CD in different objectives.

The non-dominated sorting approach is modified with the implementation of the DCD technique. The step-by-step procedural flow of the proposed MNSGA-II incorporating DCD is given below.

2. Select the parameters like the number of population, the maximum number of generations, crossover and mutation probabilities.

6. Perform non dominated sorting for combined parent population and offspring population.

7. Generate population for next-generation from combined parent and offspring population using DCD.

Hence, the diversity of MNSGA-II and the Pareto optimal front is obtained with high uniformity.

where xl and xu are the lower and upper bounds of variables; x= {Kp, Ki, Kd and C}; T is the simulation period length. The lower and upper bounds of PID parameters of desired output voltage where Kp∈[0,15], Ki∈[0,100], Kd∈[0,1] and C = {50, 150, 250, 450, 850}.

The proposed topology is simulated in the MATLAB Simulink platform and is depicted in Fig. 5. The specification details of the proposed circuit are given in Tab. 1. At 1000 W/m2 irradiation and 0°C temperature, the solar panel provides 25 V DC, 14 A DC power given as input to MZSBC and is boosted to 75 V DC, 4.6 A DC with a gain value of three. The power switches are triggered with the PID controller with two different proposed algorithms, like NSGA-II and MNSGA-II, for multi-objective functions, as shown in Fig. 6. The optimal Kp, Ki, Kd and C solution can be selected by minimizing the integral square error value of desired and ripple output voltage, respectively. The initial parameter values used in different algorithms are shown in Tab. 2.

Figure 6: Operation diagram of the PID controller using NSGA/MNSGA optimization to control modified Z-source boost converter circuit voltage

The Pareto optimal solution for ISE of ripple in the output voltages of NSGA-II and MNSGA-II is depicted in Fig. 8. A comparison is made between ISE of ripple in output voltage and ISE of desired output voltage in the Pareto optimal solution. The optimal gain values Kp, Ki, Kd are tuned by the PID controller which NSGA-II and MNSGA-II obtain to reach the multi-objective optimization. Comparative performance of existing and proposed algorithm type with MZSBC is tabulated in Tab. 3. The comparative chart is built-in Fig. 7 between algorithm type as well as efficiency @ 1000 W/m2.

Figure 7: Comparison chart between algorithm type and efficiency (%) for different converters

4.2 Comparative Performance of Proposed Topology Using Existing and Proposed Algorithm

The constant temperature of 25°C and change in irradiation with time is depicted in Fig. 9. Fig. 10 depicts the flowchart of the incremental conductance method, an MPPT algorithm used for MPP tracking to provide optimal power to the load for improving the load performance.

Fig. 11 shows the PV and IV curves obtained from the solar panel once the MPPT is included. The panels provide 350 W power with 25 V DC and 14 A DC as input to the MZSBC.

The PID controller-based MPPT and NSGA-II and MNSGA-II tuning contribution of this work is to increase the response of MZSBC with a feedback system. The MPP technique used is the incremental conductance algorithm. The input voltage 25 V is boosted to 75 V while tuned by MPPT and NSGA-II/MNSGA-II based controllers, shown in Figs. 12, 13, 15, and 16. The steady-state output voltage and current waveform of the proposed MPPT and MNSGA controller-based MZSBC is shown in Figs. 15 and 16. The output response of MZSBC is compared while tuned with MPPT and NSGA-II as well as MNSGA-II PID controller. On comparing both the controllers, the initial damping is reduced in the MNSGA-II technique. As a result, the ripple content of NSGA-II and MNSGA-II are 0.6 and 0.045 V as shown in Figs. 14 and 17.

Figure 14: Simulation ripple output voltage of proposed converter NSGA-II method

Figure 17: Simulation ripple output voltage of proposed converter MNSGA-II method

Hence, the ripple content in the output response gets reduced in the MNSGA-II technique. Therefore, it is clearly shown that the NSGA-II method oscillates between 75.3 and 74.7 obtaining ripples of 0.6 V whereas, the MNSGA-II method oscillates between 75.035 and 74.99 obtaining 0.045 V ripples. The dynamic performance analysis of solar PV integrated MZSBC of the output voltage 75 V is created in input voltage by changing the magnitude from 25 to 45 V which is created at t = 0.5 s and the input is reinstated at t = 0.54 s which is indicated in Fig. 18. According to the simulation results of MZSBC, it would be more advantageous and delivers high output power with lower input voltage peak overshoot.

Figure 18: Simulation dynamic response of proposed converter for change in input voltage (a) output voltage (b) Output current

The step responses of ZN-PID, NSGA-II, and robust are shown in Fig. 19, amplitude vs. time in seconds graph and it clearly shows that the settling time, peak overshoot, steady-state error, and transients are better in the MNSGA-II algorithm compared to the other two methods. In addition, a reference voltage variation analysis is made for finding the optimal efficiency during the MNSGA-II controller implementation with MZSBC and is tabulated in Tab. 4 and the performance measures of the proposed converter as compared to existing topologies is tabulated in Tab. 5.

Fig. 20 shows the battery model simulated on MATLAB. This lithium battery model’s equivalent impedance is calculated and evaluated as a resistor-capacitor load for analysis.

The experimental result section includes the hardware setup of the proposed MNSGA-II-based MZSBC converter system with the simulation dynamic reponse and ripple in the output voltage and output current waveform using the MNSGA-II method.

Fig. 21 shows the experimental setup of the proposed work when using MPPT and MNSGA-II based PID algorithm.

FPGA Controller is established to trigger pulses for the power semiconductor switch and the generated pulse waves for the proposed optimization algorithm are depicted in Fig. 22.

The dynamic performance study while changing input voltage and the output responses are shown in Fig. 23 and enlarged view of dynamic response is shown in Fig. 24.

Fig. 25 shows the steady-state output response with ripple content. Simulation and hardware outputs are almost the same since 25 V DC from solar PV is boosted to 75 V DC with a ripple value of 0.045 V. Hence, an efficient topology is designed. As a result of the proposed methodology, there is less switching loss, improving power load performance. An evolutionary algorithm-based controller enhances the system’s efficiency and reliability. The proposed MPPT and NSGA-II/MNSGA-II algorithms improve the dynamic and steady-state performances of the system. It is apparent from the output voltage and outputs current waveforms that the performance linearly increases from 0.91 to 0.99. The proposed converter MNSGA-II evolutionary algorithm achieves a better efficiency of 98% at the maximum iteration rate.

Figure 25: Hardware results of ripple in the output voltage and output current waveform using the MNSGA-II method

This paper concentrates on an efficient way of charging an electric vehicle battery with a good battery and equivalent impedance models. A boosting topology is employed to charge a battery better and act as a charge controller. The power range of 350 W is utilized to charge a battery of serial 12 V, 7 Ah pack. The MZSBC converter gives a high gain from 25 V DC to 75 V DC with a small duty ratio that provides higher efficiency at the boosting level. The closed-loop simulation with different performance analyses is achieved. The PID controller gain parameters are tuned with an MPPT and NSGA-II/MNSGA-II algorithm, improving the system’s dynamic and steady-state performance. Also, the ripple content is reduced on the output side. The efficiency obtained is around 98%. A comparative study is made between proposed and existing boost converter topologies considering the efficiency and algorithm type. The simulation and hardware implementation with the best results were obtained. The dynamic performance with change in input voltage is analyzed and the reference voltage variation analysis is made to find the optimal efficiency of the proposed converter.

Acknowledgement: The authors with a deep sense of gratitude would thank the supervisor for his guidance and constant support rendered during this research.

Funding Statement: The authors declare that they have no conflicts of interest to report regarding the present study.

Conflicts of Interest: The authors declare that they have no conflict of interest.

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Intelligent Automation & Soft Computing DOI:10.32604/iasc.2022.025396
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