All Vanadium Flow Battery - A Strong Competitor for Long$ Term Energy Storage

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2024-03-13 17:50

Guided by the "dual carbon" goals, China's new energy industry has ushered 'in a new era of rapid development. Renewable energy, represented by photovoltaic and ↑wind power, is rapidly changing our energy landscape. With the rapid £increase in the proportion of renewable energy generation connected to th¶e grid,

Guided by the "dual carbon" goals, China≠'s new energy industry has ushered in a new era  of rapid development. Renewable energy, represented by photovolta©ic and wind power, is rapidly changing our energy landscape. With the rapid increase in the prγoportion of renewable energy generation connected to t$he grid, the "dual randomness" and "double peaks and do±uble heights" characteristics of the power system are becoming increasingl≈y prominent, and the power grid is facing pressure on consumption and operati✘onal safety challenges.

To ensure the stability, economic dispatch, and high₽ quality of electricity in the power system, and further form a controllable and di‌spatchable power grid, the power system needs to be equipped with energy storδage to make renewable energy a more friendly and high-quality new energy source.

As the penetration rate of renewable energy gradually increase★s, the mismatch of time and space in renewable energy ≤generation such as photovoltaics and wind power is becoming increasingly pro©minent, further fueling the demand for long-term energy storage scheduling in th e power system. Long term energy storage (energy storage tecαhnology with a continuous discharge time of more than 4 hours) can enhance the consumption ca¥pacity of renewable energy generation and effectively reduce the cπonsumption pressure and operating costs of the power system. Vanadium flow batteries (here inafter referred to as "vanadium batteries"), which have advantages such as high inh→erent material safety, long cycle life, recyclable elect≈rolyte, high cost-effectiveness, and environmental friendliness, may stand out♠ in the field of long-term energy storage.

Energy storage is indispensable in the wave of new energy

In recent years, the demand for renewable energy has becoδme increasingly urgent. Renewable energy sources such as photovoltaics a$nd wind power are leading the future energy revoluti≈on with their unique advantages and enormous potential. With÷ the increasing proportion of renewable energy in the power grid, Battery Energy Stora"ge System (BESS) will play an increasingly crucial role between renewable energy supply and grid l₽oad, becoming an indispensable technology for acce₹lerating the replacement of traditional fossil fuels with re&newable energy.

According to the different principles and technologies of en ergy storage, energy storage technology can be divided into three categories: electric energy ↑storage, thermal energy storage, and hydrogen energy storage∞. The energy storage technology industry, excluding pumpe d storage, is collectively referred to as new energy storageλ, mainly including lithium-ion batteries, flow batteries, compressed air energy sto±rage, flywheel energy storage, hydrogen (ammonia) energy stora₽ge, etc. Compared to pumped storage, new energy storage generally↕ has advantages such as short construction period, flexible site selection,£ fast response, and strong regulation ability, which can provide more time scale regulat↓ion capabilities for the power system.

The output of renewable energy sources such as wind and βsolar power fluctuates greatly and is accompanied by uncertainty.

From the perspective of the daily output of wind and solar power and th→e peak and valley load of the power grid, wind power generally hφas low daytime output and high nighttime output, while photovoltaic p ower generation has high noon output and no output at night. The daily elec₩tricity load presents two peaks in the morning and eveniλng. During the peak period of wind and solar power output, the net βload peak significantly decreases, and the net load presents a sig♠nificant "duck curve" feature, with a significant increase in load volatility.

From the perspective of seasonal wind and solar power output‌ and grid load peaks and valleys, the peak wind power φoutput is in spring and autumn, while the peak photovoltaic power generation is in su≥mmer and autumn (daytime). In winter and summer, es÷pecially at night, the load electricity is high while the renewable energy genera↓tion is low. The grid load has a clear characteristic of "winter and summer" ≠double peaks, making it difficult to match the sea×sonality of renewable energy generation.

And from renewable energy output and grid load