Trystan Casey
Electric vehicles (EVs) are automobiles that are powered fully or mostly by electricity. The frequency of electricity in an EV refers to the utility frequency or grid frequency, which is the nominal frequency of changes in alternating current (AC) in an electrical grid. The load of a power grid is typically measured in Hertz (Hz), with 50 Hz in Europe and 60 Hz in the USA. This frequency provides information about the ratio of electricity generation to consumption, indicating a balance between supply and demand. Electric vehicles can play a role in frequency containment reserves, helping to stabilize the grid during short-time disturbances and contributing to the overall efficiency and reliability of electric powertrains.
| Characteristics | Values |
|---|---|
| Household alternating current (AC) frequency in Europe | 50 Hertz (Hz) |
| Household alternating current (AC) frequency in the USA | 60 Hz |
| Traction battery pack function | Store energy gathered from the grid during charging |
| Electric vehicle inverters | Change the battery pack's flow of electrons from Direct Current (DC) to Alternating Current (AC) |
| Inverter function | Control the frequency of AC power being sent to the motor |
| Electric vehicle powertrain | Entire high-voltage electrical system that allows the vehicle to operate |
| Electric powertrain composition | Inverter, electric traction motor, reduction drive, and traction battery |
| Hybrid electric vehicle (HEV) | Low-emission vehicle that uses a small battery pack to assist an internal combustion engine |
| Plug-in hybrid vehicle (PHEV) | Runs on electricity until its battery pack runs out of power, then runs on gasoline |
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What You'll Learn
Electric vehicles (EVs) as frequency containment reserves
The frequency of the electrical grid (also known as utility, power line, or mains frequency) refers to the nominal frequency of changes in alternating current (AC) within the grid. Typically, the frequency is either 50 Hz (as in Europe and Asia) or 60 Hz (as in the US). This frequency fluctuates depending on the load on the grid, dropping when the demand is high and/or supply is low, and increasing when the demand is low and/or supply is high.
Electric vehicles (EVs) are motor vehicles that are powered fully or mostly by electricity, which they store in large traction battery packs. They have no internal combustion engine and emit no exhaust from a tailpipe. EVs can be plugged into a wall outlet or charging equipment to recharge.
EVs can be used as frequency containment reserves for short-time, temporary disturbances (FCR-D). They provide ancillary services to the power grid, helping to maintain stability and balance between supply and demand. If this balance is not maintained, the grid can suffer from power outages.
The concept of using EVs as frequency containment reserves is based on the idea of reserve pools, where a large number of EVs are charging simultaneously. For example, a pool of 1,000 EVs charging with 22 kW of power can be controlled with any energy system signal and the frequency of the electrical grid. When the grid frequency drops due to overload, the EV charging power can be automatically reduced, acting as a reserve to prevent power outages.
This strategy is particularly effective with bidirectional charging, where EVs can also push electricity back to the grid. For instance, 1,000 EVs pushing 10 kW of power back to the grid create a reserve of 10 MW. These reserves can be sold to a Transmission System Operator (TSO) as Frequency Containment Reserves (FCR). However, frequent charging and discharging during FCR participation may accelerate EV battery degradation, so this must be carefully considered.
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The role of inverters in controlling AC power frequency
Inverters are pivotal in shaping the future of electrical power systems, including automobile electricity. A power inverter is a device that changes direct current (DC) to alternating current (AC). The AC output frequency of a power inverter device is usually 50 or 60 Hertz (Hz) in most regions, which is the standard power line frequency. This inverter frequency is essential for the proper functioning of electrical devices and systems, as it dictates the speed at which motors rotate, lights flicker, and electronic components operate.
Inverters play a crucial role in various applications, including automotive electricity. In electric vehicles (EVs), inverters are used to control the speed of the electric traction motor and the torque it produces. The inverter converts the DC power from the traction battery pack to AC power, which is then used to run the vehicle's accessories and recharge the auxiliary battery.
Inverters also have applications in solar power systems. Solar inverters convert solar energy into AC power, allowing it to be used in conjunction with battery storage systems. In a solar system, each solar panel might be attached to a single central inverter, or multiple panels may be connected to a string inverter. Microinverters, which are smaller and placed on each panel, offer the advantage of not being affected by shading or damage to one panel, but they are more expensive.
Additionally, inverters are used in motor speed controllers, refrigeration regulation, and induction heating. The AC output frequency of these applications may vary depending on the specific design and requirements. For example, in motor driving, a variable frequency allows for variable speed control. The input voltage, output voltage, frequency, and overall power handling of an inverter depend on its design and circuitry.
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The history of EVs and their early popularity
Electric vehicles (EVs) have been around in some form since the late 1820s and 1830s, when crude electric carriages were invented. However, it wasn't until the late 19th century, during the Second Industrial Revolution, that the first practical, commercially available electric vehicles appeared. This was due to the electrification and mass utilisation of DC and AC electric motors.
One of the earliest electric vehicles was built by Professor Sibrandus Stratingh of the University of Groningen, Netherlands, in 1835. It was a miniature electric vehicle car. Around the same time, between 1832 and 1839, Robert Anderson of Scotland invented the first crude electric carriage, powered by non-rechargeable primary cells. Other pioneers of early electric vehicles include American blacksmith and inventor Thomas Davenport, who built a toy electric locomotive in 1835, and Scotsman Robert Davidson, who built an electric locomotive that could reach speeds of four miles per hour in 1838.
By the 1890s, electric vehicles were becoming more common, with companies like Baker Electric, Columbia Electric, and Detroit Electric producing them. Electric vehicles were among the earliest automobiles, and in the early 1900s, they held many vehicle land speed and distance records. In 1900, electric cars were at their peak of popularity, accounting for around a third of all vehicles on the road in the US. They were favoured for their quietness, comfort, and ease of operation, which couldn't be matched by gasoline engine cars at the time.
The popularity of electric vehicles continued into the 1910s, with some of the best-known makers of gasoline cars exploring electric options. For example, in 1898, Ferdinand Porsche developed the world's first hybrid electric car, and Thomas Edison worked on improving electric vehicle batteries. Even Henry Ford partnered with Edison to explore options for a low-cost electric car in 1914. As more people gained access to electricity in the 1910s, it became easier to charge electric cars, adding to their popularity.
However, in the early 20th century, the high cost, low top speed, and limited range of electric battery vehicles compared to internal combustion engine vehicles led to a decline in their use as private motor vehicles. The early heyday of electric cars had passed by the 1920s, and by the 1930s, the electric automobile industry had effectively disappeared. While there were some attempts to revive electric vehicles in the following decades, such as the joint research effort between American Motors Corporation (AMC) and Sonotone Corporation in 1959, they did not gain widespread adoption. It wasn't until the end of the 20th century that interest in electric vehicles began to increase again due to growing concerns about the environmental impact of hydrocarbon-fueled vehicles.
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How EVs work and their key components
Electric vehicles (EVs) are motor vehicles that are powered fully or mostly by electricity. They have an electric motor instead of an internal combustion engine. The first electric vehicles came into existence in the late 19th century, but they were most popular in the early 1900s, when they held many vehicle land speed and distance records. In 1900, 28% of the cars on the road in the US were electric.
EVs have several key components that work together to make the vehicle move. Firstly, they have a charge port that allows the battery pack to receive energy from an external power source. This could be a private residence or a commercial charging station. The electricity is then stored in the traction battery pack, which provides power to the electric traction motor. The electric traction motor then moves the wheels of the vehicle.
The onboard charger is another important component of EVs. It takes the incoming AC electricity supplied via the charge port and converts it to DC power for charging the traction battery. It also monitors battery characteristics such as voltage, current, temperature, and state of charge while charging. The power electronics controller manages the flow of electrical energy delivered by the traction battery, controlling the speed of the electric traction motor and the torque it produces.
Another key component of EVs is the thermal system, which maintains a proper operating temperature range for the engine, electric motor, power electronics, and other components. The powertrain encompasses the entire high-voltage electrical system that allows the vehicle to operate, including the inverter, electric traction motor, reduction drive, and the traction battery. The inverter changes the battery pack's flow of electrons from Direct Current (DC) to Alternating Current (AC), which is then used to power the electric traction motor.
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The benefits of adopting EVs
Electric vehicles (EVs) are becoming increasingly popular worldwide, with sales accelerating in many countries. The transition to EVs is particularly notable in the three biggest car markets: China, Europe, and the United States, which collectively account for 60% of global car sales. Here are some of the key benefits of adopting EVs:
Environmental Benefits
EVs have zero tailpipe emissions, which significantly reduces toxic emissions from petrol and diesel vehicles. This makes them much better for the environment and helps to improve long-term public health outcomes. Even when considering the emissions associated with manufacturing and charging EVs, their total greenhouse gas emissions over their lifetime are typically lower than those of traditional gasoline cars. Additionally, as more renewable energy sources are used to generate electricity, the environmental benefits of EVs become even more pronounced.
Cost Savings
EVs are more energy-efficient than traditional gasoline vehicles, which only convert about 16-25% of the energy from gasoline into movement. In contrast, EVs can convert around 60% of electrical energy from the grid to power their wheels. This higher efficiency leads to lower running costs, as charging an EV is generally cheaper than fueling a petrol or diesel vehicle. Furthermore, advancements in battery technology and increased production volumes are expected to drive down the purchase prices of EVs, making them even more cost-effective.
Convenience and Flexibility
EVs offer flexible charging options, as they can be charged at home, overnight, or at public charging stations. This eliminates the need to visit fuel stations during peak hours and allows for more convenient journey planning. Additionally, EVs have silent functioning due to the absence of a traditional engine, providing a quieter driving experience.
Government Incentives
Many governments are actively promoting the adoption of EVs through various incentives. For example, some countries offer tax breaks and subsidies, making EVs a more financially attractive option for consumers. Governments are also investing in the development of EV charging infrastructure, addressing the issue of range anxiety and making it more convenient for drivers to adopt EVs.
Widespread Adoption Potential
Industry experts predict that EVs will account for a significant portion of car sales in the coming years, with an estimated 73 million EVs sold by 2040. This transition is already well underway in countries like Norway, China, and those in the EU, and it is expected that late-adopting countries may experience even faster growth rates.
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Frequently asked questions
The frequency of automobile electricity, or grid frequency, is typically 50 Hertz in Europe and 60 Hertz in the USA. This is also known as utility frequency, power line frequency, or mains frequency.
The difference in frequency between Europe and the USA is mainly historical and can be traced back to the beginnings of electrification. Even within countries, different frequencies were used as recently as the 1940s and 1980s.
The grid frequency provides information about the supply and demand balance of electricity in a power grid. If there is a surplus or deficit of electricity, the frequency will increase or decrease, respectively.
EVs can be used as frequency containment reserves to help stabilise the power grid. When the grid is overloaded and the frequency drops, EV charging power is automatically reduced to prevent power outages.
The frequency of the grid refers to the number of polarity changes between two points per second. A higher voltage results in a higher electrical output, which is calculated using the formula: P (electric power) = V (electric voltage) * A (electric current).
