Technical Principles and Core Advantages
Feedback braking technology enables energy-efficient use by feeding back the electricity generated by the motor's regenerative power generation state to the grid or energy storage device. Its core advantages include:
Energy saving: Compared to energy-consuming braking (electricity is converted into heat waste), the feedback brake can recover 15% -30% of the braking energy.
System protection: to avoid the frequency converter DC bus voltage damage due to the accumulation of renewable energy, extend the life of the equipment.
Dynamic response: controlled in conjunction with the frequency converter for fast braking (e.g. mine winch applications can reduce gate wear).
Second, the current state of industry applications
Industry:
Frequency converters are widely used in asynchronous motor drives, and by 2025 China's frequency converter market size is expected to exceed 60 billion yuan, with high-voltage frequency converters accounting for 35%.
In mine lifts, wind turbine pumps and other load scenarios, feedback braking can reduce maintenance costs by more than 40%.
New energy vehicles:
Electric vehicles improve mileage through feedback braking, technological maturity is high, but it is necessary to solve the problem of harmonic interference of the grid.
Future trends
Technology Integration:
Combined with intelligent algorithms, it achieves precise braking torque allocation (such as permanent magnet gear regulator efficiency of up to 98%).
The demand for high-voltage frequency converters in the power and metallurgy industries is growing, and the market size may break through 16 billion yuan in 2025.
Policy Driven:
China's Motor Energy Efficiency Improvement Plan requires that energy-efficient motors account for more than 70% by 2025 to promote the popularization of feedback braking technology.
Emerging Markets:
The Asia-Pacific region (especially China) will become a growth engine, with the global frequency converter motor market expected to reach 150 billion yuan in 2025.
Challenges and improvements
Grid compatibility: Inverter control strategies need to be optimized to reduce the impact of feedbacks on the grid.
Cost control: The domestication rate of high-voltage inverters has risen to 58%, but the high-end market is still dominated by international giants such as Siemens.