A case Study on wired and Wireless charger standards in India for Electric Vehicle Application

. India has taken major step in adopting the electric vehicle by means of FAME Scheme (Fast Adoption and Manufacturing of Electric Vehicles), a government initiative. ARAI (Automotive Research Authority of India) and DHI (Department of Heavy Industry) have published standardization protocol for both EV charging infrastructure. Many of those standards are derived from the SAE (Society of Automotive Engineers) Internationals and IEC (International Electrotechnical Commission). USA, Europe and China are also following the same standards to build the EV (Electric Vehicle) infrastructure. This paper provides the Indian standards to build EV charging infrastructure and comparing it with other countries. Glimpses on energy demand for electric vehicles in Indian market. It also provides the demanding wireless pow er transfer technology in EV’s. Status of Standards provided by the industry on wireless power transfer. Factors that are necessary to be considered before drafting the standards for WPT.


India's Charging Infrastructure
India aims to have at least 15 percent of the vehicles on its roads to be electric in five years, signalling the government's wish to join a long list of countries around the world that are already seeking to cut fossil fuels aggressively. While cumulative global sales of passenger electric vehicles likely surpassed 4 million in August, with China accounting for more than a third since 2011, India sold an estimated 2,000 EVs 2017. EVs may account for about 7 percent of sales in India by 2030 by [1]. The government of India (Department of Heavy Industries -DHI) is already providing incentives through FAME scheme (Faster Adoption and Manufacturing of Electric Vehicles) from the year 2015 in order to reduce the price of EV's. The government has also approved pilot projects, charging infrastructure projects and technological development projects. Energy Efficiency Services Limited (EESL), under the administration of Ministry of Power, Government of India (GoI), has ordered 10,000 EVs [2]. With all the initiation that India has been taking, there is serious issue of charging infrastructure for both wired and wireless charging system. Standardization to the technical aspects of the EVs charging, range and price are the major barrier for deployment. Currently in India, there are very small scale of AC and DC charging stations available, which are installed by EV manufacturers. Even though the AC slow charging infrastructure at residences, workplaces and public places requires very low investment when compared to fuel stations. Still, the EV charging infrastructure growth in India is not up to the mark. To grow large scale of charging infrastructure in India it requires continuous support from the government, utility grid authorities and automobiles manufacturers.

The International Electrotechnical Commission (IEC 62196) modes definition:
Mode-1: Slow charging from a regular electrical socket (single or three phase) Mode-2: Slow charging from a regular socket but which equipped with some EV specific protection arrangement Mode-3: Slow or Fast charger using a specific EV multi-Pin Socket with control and protection functions Mode-4: Fast charging using some specific charger technology such as CHAdeMO. [4]

European EV Standards
• Normal power or Slow Charging with rated power inferior to 3.7kW is used for domestic application or for long-time EV parking. • Medium power or quick charging with a rated power from 3.7-22kW is used for private and public EV • High power or fast charging with a rated power superior to 22kW is used for public EV [4]

TYPE-1:
The charger is on-board and provides an AC voltage at 120 or 240 volts with a maximum current of 15A and a maximum power of 3.3kW TYPE-2: The charger is on-board and provides an AC voltage at 240V with a maximum current of 60A and a maximum power of 14.4kW.

TYPE-3:
The charger is off-board, so the charging station provides DC voltage directly to the battery via DC connector with maximum power of 240kW. [4]

EV charging based on Power and Usage Location
Charging ratings of different electric vehicles based on their usage are classified from normal power rating of 3.7kW to >22kW. diesel for traction. The figure 1 shows the historical vehicle production data along with the estimated production volumes by 2030 which is indicated with blue line and also it shows the historical & estimated fuel (both petrol & diesel) consumption in MMT (Million Metric Tonnes) which is indicated with red line.  Hence by 2030 in India, 100% of BEV's would require an energy of 929.3 TWh which is about 37% additional electricity to be produced apart from estimated electricity generation of 2500 TWh (includes domestic, commercial, agriculture & industrial sectors etc.) [6].

Indian Automobile Industry -An Overview
The Indian Automobile Industry is currently ranked 5th largest in the world and is set to be the 3rd largest by 2030.The requirement of mobility in India is set to change dramatically in the near future to cater to the requirement of 1.30 billion population While there is a vision for 100% electric vehicles by 2030, most industry experts indicate that around 40-45% EV conversion by 2030 is a realistic expectation. A major push towards EVs will be led by the public transportation requirements in India -Fleet cars, E-Buses, 3 wheelers and 2 wheelers. Personal vehicle options for EVs will still be a relatively smaller element in the whole pie. The Government plans to work towards creating a demand for EVs by buying in bulk, which could provide for large orders for automakers. A tender for 10,000 cars is already issued and now a major tender for electric buses in 11 cities is likely to be released soon. [7]

The outlook for 2018
-Passenger cars to see a higher increase in new model launches compared to utility vehicles.
-Production capacity will also be added at car makers to reduce waiting periods and to boost demand. (Passenger vehicle segment growing between 7-9%).
-In the two-wheeler segment, motorcycles are expected to grow moderately while scooters will continue to grow in double digits with two-wheelers growing between 9-11% in FY'18.
-Industry moving towards a March 2020 launch of BS-6 and most OEM/Auto component firms have made investments to meet this deadline.

EV Chargers in India
Post FAME and the Niti Ayog Plan announcement, we have seen an increased trust on setting up EV chargers in India. Some names we could confirm, who have joined interest in EV Chargers manufacturing are Raychem RPG India, Analogic India, Deltron, EOS Power, AdorPowertron, Kraft Power Con, Elind etc.

Global EV Charger firms on Indian Market
More than six key global firms eyeing the EV Chargers market closely. Firms like ABB India, Delta India, Schneider India, Siemens India etc are looking at the Indian market closely. These firms have their global designs and products. They are studying the technical/specifications, business models and potential for their products. All these firms are only looking at the 4 Wheelers' (Cars) EV Chargers.

EV Wireless Charging Standards
As the world is advancing towards the wireless charging from smaller biomedical application to the electric vehicle charging system. Standardization is the main barrier holding the commercialization of high-voltage and high-power WPT for EV charging. It includes safety criteria, efficiency, EM(Electromagnetic) limits, and interoperability targets, along with test setup for getting wireless charging. It should provide the compatible charging station to all the EV owners. IEC-61980-1 standard contains the total system of WPT from supply network to EVs charging the battery or any equipment of the same at the standard supply of 1000-Vac or 1500-Vdc. These all are addressed by SAE in its standard SAE TIR J2954 (TIR-Technical Information Report). This is the first standard developed by SAE in WPT for an EV charging application. This standard is developed specifically for SWC. The frequency band, interoperability, safety, coil definitions, and EMC/EMF limits from SAE TIR J2954 allow any attuned vehicle to charge wirelessly from its wireless home charger, office or a commercial charger with the same charging ability. Table 5 shows key standards for wireless charging. [8] In the near term, vehicles that are capable to be charged wirelessly under recommended practice should also be able to be charged by SAE J1772 plug in chargers. SAE recommended practice J2954 is intended to be used for stationary applications (charging while vehicle is not in motion). Dynamic applications may be considered in the future based on industry feedback. SAE Recommended Practice J2954 is meant to be used for interoperability, performance and emissions testing, where a single standard coil-set has been chosen for the WPT Power Class 1 and 2 to 7.7kW, per Z-Classes (1 through 3) which is circular topology. However, there are two reference options for WPT 3 to 11kW per Z-classes (1 through 3) with two topologies. The next revision of the Recommended Practice in 2018 is slated to have one standard coil set for WPT 3. SAE TIR J2954 establishes a common frequency band using 85 kHz (81.39 -90 kHz) for all light duty vehicle systems. [9].

CONCLUSION AND FUTURE WORK
The major obstacle to the adaptation wireless EV's charging is the standardization. The inductive coupled power transfer has given greater results than the other types of system. The factors that needs standardization are geometry of coils, volume and weight, position of coil, alignment, frequency, compensation topologies, distance and Efficiency. Including the human and environmental consideration due to electromagnetic radiation. DHI and ARAI has provided standards for conductive charging infrastructure. The standards provided are very limited to the charging equipment and its features. But lacks in charging time, driving range, lack of awareness and efficiency.