Battery management technology to help strengthen the grid Semiconductor innovations in battery systems are driving the adoption of energy storage technologies
. The grid was not designed to take into account new power demands and supply types.
.Battery energy storage systems are key to transforming and protecting the grid.
. Innovations in battery management and high-voltage semiconductors can help grids make the most of battery energy storage.
With the growing popularity of electric vehicles (EVs) and the transition to more renewable energy sources, our dependence on fossil fuels that has existed for more than a century is decreasing. Electric companies are increasingly turning to solar panels and wind turbines (rather than natural gas turbines) to generate electricity to charge electric vehicles and power our homes and businesses. These trends bring us one step closer to a sustainable energy future.
These trends also pose huge challenges to the power grid. Different times of the day have different needs, and available solar and wind energy also changes with weather changes. Therefore, batteries become an important part of the electrical grid.
"Battery can fill in the gaps when it's cloudy and the winds are down," said Richard Zhang, a professor at Virginia Tech who teaches power electronics technology courses at the school and has worked in the grid and energy industry for 25 years. Off-peak charging, supplying electricity during peak hours, such as charging electric vehicles, therefore improves the economics of electricity.”
Making batteries safe, reliable and cost-effective to store and release large amounts of power from the grid is a complex challenge. Texas Instruments' expertise in providing advanced battery management semiconductor solutions can be put to good use.
“Batteries used in the grid are larger and have higher voltages, requiring better thermal management and more sophisticated monitoring,” said Samuel Wong, vice president and general manager of the Battery Management Solutions business unit at Texas Instruments. “To effectively manage these Batteries require an understanding of battery chemistry and the use of high-performance semiconductor devices to safely and fully utilize each battery."
Solve power grid problems
Richard says the adoption of solar and wind power, as well as electric vehicles, is good news for the planet. The problem is that the grid was not designed to take into account these new types of demands that electricity places on available energy.
"It's much easier to get people to choose electric vehicles today than it was a few years ago," he said. "Now there's a growing issue of getting the electricity infrastructure to handle electric vehicles and other energy needs."
Samuel believes the challenge lies in grid instability, in other words, fluctuations in generation and consumption. Solar and wind power generation causes changes in energy supply, especially at night, where solar power generation is completely impossible. The charging habits of EV owners can also lead to fluctuations in supply and demand.
“If everyone went home at night and charged their electric cars overnight, the grid might not be able to handle it,” he said.
Figure 1: Samuel Wong (left), vice president of Texas Instruments’ Battery Management Solutions business unit, discusses the impact of battery energy storage systems with Virginia Tech’s Richard Zhang.
Samuel and Richard, like most power experts, agree on a solution to grid instability: energy storage systems (ESS). Energy storage systems, often in the form of batteries, can capture and store excess electricity from the grid when supply is high and demand is low, and then provide power at other times. You might think of the relatively small, lightweight battery cells used in electric vehicles. But for the grid, energy storage systems are made of larger, heavier cells stacked in the shape of train cars. Each battery pack can operate at up to 4 megawatt hours (MWh), enough to power thousands of homes.
Placing energy storage systems at different locations on the grid can optimize its power distribution capabilities, that is, distributing large amounts of power to various communities anytime and anywhere. This could mean placing an energy storage system next to a solar panel farm, where it can absorb excess electricity during the day and then pump it back into the grid at night. Or placing the ESS within a community can more conveniently draw power from local rooftop solar panels and then provide additional power to charge nearby electric vehicles when needed. “Energy storage can serve as a local energy reservoir for a community,” says Samuel.
Manage battery and system performance
The core of the energy storage system is a high-voltage battery module, usually a lithium iron phosphate battery. If you charge or discharge too quickly, a lot of heat will be generated. The lifespan of these modules can also be shortened if completely exhausted too often.
Monitoring the temperature and charge of these batteries requires extremely sophisticated semiconductors, such as the BQ79616 industrial battery monitor, Samuel said. That's because even small fluctuations in temperature and voltage can be a sign that your battery needs attention.
"You have to have millivolt accuracy to know how much power is left in the battery," he said.
Texas Instruments’ extensive experience with ultra-precision battery monitors has proven critical in helping the energy storage industry produce systems that provide critical battery management data to the grid. Samuel points out that these results will have a significant impact on the cost-effectiveness of grid energy storage systems.
"If you can only measure the power of a 10MWh energy storage system with 5% accuracy, then you can't safely use more than 9.5MWh," he said. "TI's battery monitor can improve the measurement accuracy to 1%. , so you can use 9.9MWh of electricity.”
In addition to accurate battery monitoring, grid-scale energy storage systems, such as those integrated with solar panel farms, require efficient high-voltage power conversion technology to help reduce power losses in grid transmission and distribution. These systems also rely on sensing and isolation technology to help maintain system safety and stability, which is critical for managing power flow up to 1500V.
Impact on the future
For the foreseeable future, innovation in battery energy storage systems will play a key role in transforming and protecting the grid amid changes brought about by solar, wind, and electric vehicle charging.
“Strengthening the grid through innovation in energy storage is truly exciting,” said Samuel. "Texas Instruments has achieved great results today and will achieve greater success with the construction of smart grids in the future."
About Texas Instruments Incorporated
Texas Instruments Incorporated (NASDAQ: TXN) is a global semiconductor company that designs, manufactures, tests and sells analog and embedded processing chips for industrial, automotive, personal electronics, communications Markets such as equipment and enterprise systems. We are committed to making electronic products more economical and practical through semiconductor technology and creating a better world. Today, each generation of innovation builds on the innovations of the previous generation, making our technology smaller, faster, more reliable, and more affordable, thereby enabling the widespread use of semiconductors in electronic products. This is the progress of engineering. . This is exactly what we have been doing for decades and even now. For more information, please visit the company's website www.ti.com.cn
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