Stochastic modelling of electric vehicle behaviour to estimate available energy storage in parking lots
2020; Institution of Engineering and Technology; Volume: 3; Issue: 6 Linguagem: Inglês
10.1049/iet-stg.2020.0011
ISSN2515-2947
AutoresUsama Bin Irshad, Sohaib Rafique, Graham Town,
Tópico(s)Transportation and Mobility Innovations
ResumoIET Smart GridVolume 3, Issue 6 p. 760-767 Special Section: Achieving an Integrated Smart Power Grid and Intelligent Transportation SystemOpen Access Stochastic modelling of electric vehicle behaviour to estimate available energy storage in parking lots Usama Bin Irshad, Corresponding Author Usama Bin Irshad usama.bin.irshad@gmail.com School of Engineering, Macquarie University, Sydney, NSW, 2113 AustraliaSearch for more papers by this authorSohaib Rafique, Sohaib Rafique School of Engineering, Macquarie University, Sydney, NSW, 2113 AustraliaSearch for more papers by this authorGraham Town, Graham Town School of Engineering, Macquarie University, Sydney, NSW, 2113 AustraliaSearch for more papers by this author Usama Bin Irshad, Corresponding Author Usama Bin Irshad usama.bin.irshad@gmail.com School of Engineering, Macquarie University, Sydney, NSW, 2113 AustraliaSearch for more papers by this authorSohaib Rafique, Sohaib Rafique School of Engineering, Macquarie University, Sydney, NSW, 2113 AustraliaSearch for more papers by this authorGraham Town, Graham Town School of Engineering, Macquarie University, Sydney, NSW, 2113 AustraliaSearch for more papers by this author First published: 10 July 2020 https://doi.org/10.1049/iet-stg.2020.0011Citations: 7AboutSectionsPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract The increasing penetration of electric vehicles (EVs) brings challenges and opportunities for power systems. One particular opportunity concerns the use of parked EVs to provide energy and associated services to the grid. In this work, the potential energy storage capacity of parking lots (PLs) of EVs is computed using the proposed stochastic model which considers the sporadic nature of the EV' behaviours (i.e. arrival/departure, battery degradation, travel pattern, charge/discharge rates). The analysis was performed for two types of PLs with very different occupancy distributions, i.e. a shopping centre PL, and a workplace PL. In both cases, the available energy storage capacity of EVs was estimated hourly using real household travel data, i-MiEV data and car park occupancy records. The results show that the aggregated energy storage capacity closely follows the occupancy of EVs in the PLs, and is substantial, with little sensitivity to charging rate. The proposed stochastic modelling considered the variations in energy consumption, battery degradation, and user behaviour, predicted 13.4% less peak capacity than deterministic modelling. Moreover, the authors conclude that the shopping centre PL is a viable energy resource to the grid, with their scale and throughput compensating for the relatively low occupancy. Nomenclature Indices i sampled vehicle h hour c EV class p parking lot Parameters energy consumed per kilometre of ith EV of class 'c' battery capacity of ith EV of class 'c' distance travel by ith EV of class 'c' arrival & departure time of ith EV of class 'c' arrival and departure standard deviation & mean of EVs in p parking lot total number of EVs of class 'c' energy required to charge ith EV of class 'c' total number of parking spaces Std. dev. & mean of number of EV of class 'c' peak value of available ESC hourly load of ith EV hourly storage capacity of parking lot probability of class 'c' of EVs initial SOC of ith EV of class 'c' charging current of ith EV of class 'c' max distance travelled on a single charge charging time ith EV of class 'c' hourly charging load demand of PL shape and scale variable of Weibull hourly state of charge of ith EV Abbreviation ESC energy storage capacity MCS Monte Carlo simulation PLA parking lot aggregator PL parking lot SCPL shopping centre parking lot SOC state of charge WPL workplace parking lot Other parameters, notations and abbreviations are described in the paper. 1 Introduction Battery-powered zero-emission electric vehicles (EVs) are expected to significantly reduce emissions [[1]]. Although the internal combustion engine vehicles are currently the dominant source of transportation, electrification in the transportation sector is increasing rapidly [[2], [3]]. EVs can be charged by plugging into electrical outlets available at home, hospitals, shopping centres, workplace and community centre car parks. The increase in load demand due to the charging of EVs may create reliability and stability issues in the existing power system [[4]]. However, their associated battery storage brings opportunities as well. By enabling vehicle to grid (V2G) and vehicle to vehicle mode extending the life time of EV's battery [[5]]. Moreover, EVs can provide ancillary services (e.g. peak shaving, voltage and frequency regulation) to support the grid [[6]]. EVs are moveable sources of energy storage and the arrival and departure times of EVs depend on the usage of the vehicle and where it is parked. For example, workplace (office) parking lots (WPLs), usually have very well-defined arrival and departure times. Normally, people spend an extended time at their workplace (i.e. more than 5 h per day) [[7]]. The periodic arrival/departure pattern and long occupancy time of commuter vehicles, if aggregated, make WPLs a potentially significant future energy storage resource. Conversely, in shopping centre parking lot (SCPL), the arrivals and departures of EVs are scattered throughout the day, and most vehicles stay for less than an hour. The widespread distribution in arrival and departure times together with the shorter occupancy vehicles in SCPLs is expected to make it challenging to estimate the available energy storage capacity. 1.1 Literature review Various methods have been reported to estimate the energy storage capacity associated with EVs and the availability of vehicles in PLs. The model proposed in [[8], [9]] calculated the storage capacity of WPLs. It also incorporated the intermittent usage of EVs, however, considered fixed values of the critical parameters (e.g. rated battery capacity, energy consumption per kilometre). An intelligent charging/ discharging method has been proposed to use the available energy storage capacity of EVs in the PLs [[10]]. Particle swarm optimisation was used to calculate the best charging/discharging time for EVs and plug-in hybrid electric vehicles (PHEVs), however, deterministic values were used to calculate the storage capacity of EVs providing limited insight into the likely variation in storage available at any point in time. Comparative analysis between the energy market and reserve market was carried out in [[11]] to determine the optimal behaviour of PLs incorporating EVs. In [[12]-[14]], the authors analysed the aggregated impact of EVs on the distribution grid but they did not consider battery degradation. The impact of arrival and departure patterns was analysed to determine the storage capacity of public and private company's WPLs [[13]]. Estimation of the aggregated storage capacity of EVs using a stochastic modelling approach was developed in [[15], [16]]. In [[17]], a stochastic model was developed to estimate the occupancy behaviour and arrival/departure pattern of EVs in WPLs using Markov chain analysis. A summary of the literature review is shown in Table 1. It can be observed in Table 1 that most of the latter works neglected the effect of driving style on energy consumption per kilometre of EVs and EV's battery degradation in calculating the storage capacity/load demand of EVs. Moreover, to determine the sporadic nature of EVs in PLs, many authors considered deterministic model whereas the EV charging load is entirely dependent on its variable usage. Detailed modelling is still an issue in determining vehicle availability, available energy resources and EV's charging demand, which depends on the needs, usage and travel preferences of EV owners. Table 1. Literature review, categorised by EV behaviour modelling for estimating ESC of EVs in the PLs Human behaviour (i.e. EV owner) Papers Daily distance travel Arrival & Dept. time Rate of charging Driving style Wh/km Market penetration EVs battery degradation Types of EVs Real data SCPL [[8], [9], [13]] ✓ ✓ Fixed ✘ Fixed ✘ ✓ ✓ ✘ [[18]] ✓ ✓ ✓ ✘ ✓ ✘ ✓ ✓ ✓ [[14], [19]] ✓ ✓ ✓ ✘ Fixed ✘ ✓ ✓ ✘ [[10], [12]] ✓ ✓ Fixed ✘ ✓ ✘ ✘ ✓ ✘ [[20], [21]] ✓ ✓ Fixed ✘ Fixed ✘ ✘ ✓ ✘ this paper (5) (1) and (2) (8) (3) (14)–(16) (4) (4) ✓ ✓ Legends: ✓ = Considered as stochastic parameter, Fixed = Considered as rated/fixed parameter, ✘ = Not considered. Virtual power plants (VPPs) aggregate the heterogeneous distributed energy resources to support the grid [[16]]. EVs with V2G capability can be a significant energy resource for VPP. In SCPL, the scattered arrival/departure pattern and shorter occupancy time of vehicle make SCPLs a less obvious resource of energy storage for VPPs. However, in this work, we show that the scale of SCPLs is likely to make it worthwhile. Deterministic model considers fix parameters, whereas EV usage (driver's behaviour) contains some uncertain parameters. These uncertain parameters often follow a probability distribution. Therefore, stochastic approach approximates the uncertain parameters by mapping them with probability distribution functions (PDFs). In this work, the stochastic model is proposed to estimate the available aggregated ESC of EVs in SCPL/WPL. The proposed model mapped each EV's parameter (i.e. , , , ) in an appropriate probability distribution with quantified uncertainty. The novelty lies in the fact that the proposed model effectively simulated the scattered occupancy pattern of vehicles in the SCPL. Moreover, this work incorporated (i) the effect of driving style on energy consumption of EVs and (ii) EV's battery degradation while estimating the ESC of EVs in the PL. As per authors' knowledge, modelling of EV occupancy pattern and estimation of available energy resources in shopping centre car parks has not previously been reported yet. The model is developed based on real data provided by (i) Macquarie shopping centre, (ii) i-MiEV usage data and (iii) on Victoria household travel surveys (HTSs). Furthermore, it can easily be extended to any size of the PL with different occupancy pattern and usage. The remainder of the paper is organised as follows: Section 2 describes a potential charging/discharging architecture for the PL, whilst Section 3 presents the modelling of energy storage capacity. The results are discussed in Section 4, Section 5 presents a sensitivity analysis of the proposed model, and Section 6 concludes the paper. 2 Architecture of a PL incorporating EVs Fig. 1 shows the conceptual architecture of a PL incorporating charging/discharging infrastructure for EVs. Every vehicle has a dedicated DC–DC bidirectional converter. These converters manage the rate of charging and discharging of EVs and connect EVs with the DC bus. The control switches enable PLA to control charging/discharging of the EVs. The DC bus of the PL connects to the utility grid (i.e. the AC bus) through a bi-directional AC–DC power converter. The distribution transformer supplies the desired level of voltage to the PL. The control switch at the point of common coupling (PCC) enables PLA and system operator to operate PL in either islanded mode or grid-connected mode. The control switches enable the PLA and system operator to schedule the charging/discharging of EVs. Vehicle-to-vehicle (V2V) and V2G power transfer is also possible via the DC bus and control switches but is not considered in this work. Fig. 1Open in figure viewerPowerPoint Conceptual architecture of PL 3 Stochastic modelling of EV storage availability 3.1 Data collection The availability of EVs in PLs is dependent upon the EV owners' travel patterns and usage. It is essential to develop a comprehensive model to determine the availability of EVs in PLs. In the proposed model, EV usage is characterised by five parameters (i.e. . All parameters are stochastic variables with their PDFs derived from real data. In this work, two types of PLs are considered: (i) an SCPL with space for 4500 vehicles; and (ii) a WPL with space for 1000 vehicles. The aggregated occupancy of the SCPL was modelled using hourly data collected over a month from a nearby suburban shopping centre (the Macquarie Centre). On average, 17,000 vehicles visited the SCPL per day. Fig. 2 shows that in this SCPL >23% vehicles were parked for <30 min and almost 92% of vehicles departed within 3 h (Note: a parking fee applied for stays longer than 3 h and all shops in the shopping centre close at 10:00 PM). Fig. 2Open in figure viewerPowerPoint Occupancy pattern of cars in SCPL The aggregated occupancy of a WPL and daily distance travelled was derived from vehicle travel survey data obtained from 25,443 people in 9715 households across the Victoria State (Australia) over a period of 3 years [[7]]. The data reported 1.1 million trips on weekdays and 8.6 million trips on weekends, including information about the origin of travel, departure time from the origin, destination point, arrival time at destination, the purpose of travel etc. The data was filtered to consider only commuters who (i) travelled <100 km per day, (ii) travelled within the city of Sydney, and (iii) used their own cars for commuting. We analysed the travel pattern of the Sydney region from the filtered HTS data. We concluded that on average, vehicles in Sydney travel ∼11,650 km per annum (i.e. ∼32 km/day). About 88% of vehicles drive <30 km per day, and ∼95% vehicles travel <45 km per day. These results are comparable to the travel patterns studies in other works, e.g. [[12], [17], [22], [23]]. We have been driving the i-MiEV EV in Sydney since 2017 and precisely analysing the factors affecting the energy consumption and battery health of EV. We observed that the energy consumption per kilometre of EV is mainly affected by the driving style, number of passengers, atmospheric temperature and battery ageing. The minimum energy consumption of i-MiEV is obtained by smoothly driving the vehicle (see Fig. 3a). Whereas Fig. 3b shows the energy consumption of EV while aggressively driving the vehicle. It can be seen in Fig. 3 that due to different driving styles, the energy consumption of i-MiEV varies in-between 159 and 211 Wh/km. The state of health of EVs' battery is significantly affected by EV usage, calendar ageing and charging/discharging pattern [[24]-[26]]. We observed that within 3 years the battery capacity of our EV (i.e. i-MiEV) is reduced from 16 to 14.3 kWh. Fig. 3Open in figure viewerPowerPoint Energy consumption per km of EV(a) Smoothly driving, (b) Aggressively driving i-MiEV 3.2 Data fitting The distribution of arrival times and departure times of vehicles to/from the PLs was modelled by PDFs chosen to give the best fit to the data. The departure time of EVs in WPL/SCPL was best fitted with a log-normal distribution, whilst the arrival time of WPL/SCPL was best fitted with an extreme-value distribution. In both cases the distributions were truncated (positive skewed and negative skewed). Moreover, occupancy time of vehicles in the SCPL was incorporated in the model by using discrete random variable having mean = 1.537 and standard deviation = 1.093. The arrival and departure pattern of SCPL are synthetically generated from (1) to (2) and are shown in Fig. 4 (1) (2)The values of the mean, , and standard deviation, , for each distribution are listed in Table 2. Table 2. Statistical parameters Parking lots Arrival time Dept. time office PL 12.1769 0.32 16.998 3.471 SCPL 12.5368 0.293 16.89 2.414 Fig. 4Open in figure viewerPowerPoint Arrival and dept. pattern of EVs in SCPL Form Fig. 3 we generalised that due to driving style the energy consumption of EV varies up to 33% of its rated value and, the battery capacity degraded up to 11% of its rated capacity. These results are comparable to the EV range estimation studies in other work, e.g. [[27], [28]]. It is assumed that every vehicle owner has different driving style and usage pattern. In order to accurately estimate the ESC of EV, it is necessary to incorporate EV owner's driving style and battery degradation of each EV. The energy consumption per kilometre driven , and battery capacity were best fitted with truncated gumbel-min and normal distributions, respectively. These distributions having a lower and upper limit specified by and , respectively. The limits of and in (3) and (4) are listed in Table 3. In (3), and whereas, in (4) and . The truncated PDFs computed by using (3) and (4) are shown in Figs. 5 and 6, respectively (3) (4)The other important factor of EV usage is the daily distance travelled. It was analysed from HTS data that about 95% vehicles travel 30% (i.e. 12 MWh) of its maximum ESC. In this period, WPL aggregator may use the available ESC to support the grid. It could also be inferred that it is risky for PLA to make energy commitments during the times when the energy availability is significantly lower compared to the day-times (i.e. from 0900 to 1600 h). Fig. 12Open in figure viewerPowerPoint Hourly estimated ESC of EVs in WPL 4.3 Comparison with literature Driving style, road conditions, travel pattern and atmospheric temperature affect the energy consumption () of EVs [[25], [28], [30]]. Moreover, ageing of battery and charging/discharging patterns are significantly reducing the battery health of EVs [[5]]. Because of the above-mentioned factors, the energy consumed per kilometer and the battery capacity of the vehicles varies significantly. However, the charging/discharging behaviour models of EVs reported in the literature considered the rated/fixed values of and . To analyse the impact of and on ESC, simulation was performed by choosing the rated values of Nissan Leaf and i-MiEV, specified by the manufacturer (i.e. kWh/km and 0.125 kWh/km and and 16 kWh, respectively). It can be seen in Fig. 13 that using the rated/fixed values of and for each vehicle compute 13.4% higher value of ESC in the peak hours. We conclude that considering deterministic values of stochastic parameters leads to an inaccurate estimation of ESC. Fig. 13Open in figure viewerPowerPoint Effect of using deterministic values on ESC 5 Sensitivity analysis This section presents the sensitivity analysis of parameters that effect the aggregated ESC of EVs in the SCPLs. Following is a list of those parameters: (i) Availability of EVs (as a function of arrival/departure/ dwell time). (ii) Rate of charging (as a function of charging power capacity). The aggregated ESC of EVs was calculated by considering (i) 100% EVs in SCPL and (ii) 100% initial SOC of EVs at the point of departure is considered as the base-case. 5.1 Availability of EVs The arrival/departure pattern and dwell time of vehicles in the PLs is dependent on EV usage and travel preferences of EV owners. Simulation is done by changing the arrival pattern of EVs (i.e. and ) and the resulting aggregated ESC is shown together with the base case in Fig. 14. The deviation of ESC with the base case is shown in the shaded area. It seems clear that the arrival/departure pattern and dwell time significantly shifts the time of availability and magnitude of ESC of EVs. If there is a need to shift the availability of ESC of EVs, the PLA can modify the arrival and departure pattern in the PL by giving considerable incentives to EV owners. Fig. 14Open in figure viewerPowerPoint Impact of change in arrival/dept. time 5.2 Rate of charging The main equipment in the proposed PLs is the charger. Charging rate of 3.6 kW (Level 2) charger is enough to charge EVs sufficiently. It is very costly to install a single charger for each vehicle. If the PLA only wants to charge EVs then one charger for three EVs seems an economical option. However, if the PLA wants to participate in the electricity market, then a dedicated charger for each parking spot is needed. Simulation is performed by upgrading the rate of charging from 3.6 to 6.6 kW and its impact on ESC is shown together with the base case in Fig. 15. It can be observed that because of the presence of a large number of vehicles, the ESC increases 3–4% in the middle of the day. It is because of the shorter occupancy time of the vehicles in the SCPL. Moreover, we are not considering dumb charging so all vehicles are not charged at their maximum charging rate. So the available ESC is not increasing significantly. It can be inferred from Fig. 15 that small shift in charging rate (i.e. from 3.6 to 6.6 kW) does not have a considerable impact on the ESC, but DC fast charger may significantly affect the ESC. Fig. 15Open in figure viewerPowerPoint Impact of change in charging rate on ESC 6 Discussion It can be observed that the maximum available ESC in SCPL is 61.9% of the maximum ESC of SCPL and in WPL, the maximum ESC available is 26.4 MWh, i.e. 66% relative to maximum ECS of WPL. However, PLA cannot utilise all of the available ESC due to charger limitation. In this paper, level 2 charge of 3.6 kW was considered for each EV. So, the maximum ESC that can be utilised in SCPL and WPL is 16.2 and 3.6 MWh, respectively. To fully utilise the available ESC, DC fast charger is needed. It is also observed that even the initial SOC of Nissan Leaf is 50%, it fulfils the daily travel requirement. The results show that the individual vehicle occupancy time duration for the WPL is higher and more predictable compared to the SCPL. However, the aggregated energy storage capability in the SCPL is significantly higher compared to the WPL for a given day. It could be inferred that the SCPL compensates the variability of vehicle occupancy with its higher aggregated energy storage capability. The SCPL is also capable of providing aggregated energy storage services after office (Workplace) hours. Moreover, the peak ESC per parking space in both PLs is approximately similar, despite the difference in occupancy pattern, usage, the magnitude of PL and number of vehicles visit per day. In terms of availability of aggregated ESC, we concluded that SCPL is a more promising resource of energy storage for VPP compared with WPL. The activation of ancillary services is stochastic and will have a significant impact on the estimation of the ESC of EVs in the PLs. However, the main objective of this paper is limited to estimating the potential energy available in PLs to support the electrical network. Currently, we do not have real data to model the ancillary services activation behaviour in the context of uncertain aggregated energy resources. However, modelling ancillary services requirements and its impact on ESC estimation will be considered in future work. 7 Conclusion A generic model incorporating five stochastic variables for estimating the aggregated storage capacity and charge available (or needed) in PLs with EVs was presented. Real HTS data and shopping centre occupancy data were used to provide realistic measures of uncertainty for each parameter. The model should assist planning and optimisation of future grids with high penetrations of EVs. Results showed that the estimated aggregate storage capacity of PLs closely follows the occupancy of EVs and is relatively insensitive to the charging rate. However, stochastic modelling reduced the estimated peak storage capacity by 13.4% relative to deterministic modelling. It was also found that the average peak storage capacity per PL space was almost independent of the use case, despite significant differences in period for which individual vehicles were parked. Consequently, shopping centre car parks were found to be potentially significant candidates for providing aggregated services to the grid, with their scale and throughput compensating for the lower occupancy. 8 Acknowledgment The authors acknowledge the support of Macquarie University through the International Research Training Program and the Macquarie shopping centre for providing data. 9 References [1]Hofmann, J., Guan, D., Chalvatzis, K. et al.: 'Assessment of electrical vehicles as a successful driver for reducing CO2 emissions in China', Appl. 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