Wind Pitch Control

A wind turbine’s emergency pitch control system shifts the blades out of the wind for safe shutdown during a grid power loss or excessive wind speeds to protect the turbine from catastrophic damage. Electric pitch systems require a backup power supply to ensure the system pitches the blades successfully during those critical moments when the turbine must be brought to a standstill.

For several years, lead-acid batteries were relied on for the backup power supply. Today, more wind farm operators choose to install turbines with Maxwell Technologies-engineered ultracapacitor backup power solutions due to our technology’s significantly longer life, minimal maintenance requirements, and ability to effectively serve this high-power application.

We provide reliable backup power for over 58,000 wind turbines worldwide.

Leading wind turbine OEMs, pitch control system manufacturers and wind farm operators turn to Maxwell for quality and reliability. Our ultracapacitor-based backup power solutions save wind farm operators the high costs of battery system replacement for electric pitch systems. Whether the turbines are installed onshore or offshore, our technology’s proven performance and resiliency in the demanding and remote turbine environment is what has earned us the trust of our customers.

Improve your levelized cost of energy with one smart move.

Levelized cost of energy (LCOE) is a primary utility industry metric for the cost of electricity produced by a generator. Several factors determine LCOE, including capital costs, fuel costs, and fixed and variable operations and maintenance costs.

Wind farm operators who choose to install Maxwell’s ultracapacitor-based emergency pitch backup systems fair better in the long-run: Wind farms using Maxwell’s backup energy storage report fewer turbine climbs, reduced costs associated with maintenance and component replacements, and increased turbine availability. We designed our solutions to help you achieve a top priority: to reduce O&M costs and improve LCOE so that you can focus on providing the best service to your end customers.

Sharpen your competitive advantage.

In a market where every cent counts and every choice affects costs and overall output, you need the technology that will help you attain your predicted production levels. Maxwell’s wind product line helps our customers stay competitive by providing the following advantages:

  • Long lifetime
  • Unmatched power delivery and fast charge/discharge capability
  • Optimal performance over wide ambient temperature conditions
  • Minimal degradation over time and with multiple pitches
  • Abuse tolerant in the demanding turbine environment
  • No corrosive acids or potential for leakage
  • Excellent economics: better, long-lasting value compared to lead-acid battery-based systems; no active management required; no regular maintenance means reduced O&M costs
  • Reliable performance results in safer operations

See available products.




In the Media

Enercon Selects Maxwell Technologies’ Ultracapacitors
Power Electronics
Improving Emergency Wind Pitch Safety and Reliability
PES Wind
The Key to Reliable Emergency Backup Power for Wind Pitch Control
PES Wind


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Ultracapacitors for Wind: Maxwell and Freqcon at HUSUM Wind 2015
The city of Husum in Northern Germany became a vivid center where major wind players and energy providers convened to exhibit their solutions and debate existing wind issues at the HUSUM Wind conference.

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Maxwell Technologies Selected for China Guodian Corporation’s First Ultracapacitor-Based Wind Energy Storage System
Beijing Huadian Tianren Electric Power Control Technology Co., Ltd., a subsidiary of China Guodian Corporation, selected Maxwell’s ultracapacitor technology as the core component of a wind farm energy storage demonstration project.

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The Advantages of Ultracapacitors in Wind Turbine Electric Pitch Control Systems
There are two types of energy storage systems used for electric wind turbine pitch control: ultracapacitor-based and battery-based. While batteries are efficient devices for many applications, ultracapacitors have the advantage when it comes to supporting a wind turbine’s electric pitch control system.

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Bringing the Power and Longevity of Ultracapacitors to the World’s Wind Turbines
Onshore or offshore serviceability is a big challenge, especially when looking at offshore applications where costly turbine maintenance is done by boat or even by helicopter.

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Practical Business Reasons for Retrofitting Wind Turbines with Ultracapacitors
Size and power aren’t the only features that have evolved in turbine technology. Ultracapacitor-based pitch control systems are becoming a standard solution offered by turbine manufacturers.

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How Ultracapacitors Can Support the Growing Wind Industry
Implementing ultracapacitors for energy storage in wind pitch control systems improves safety for technicians, increases overall performance reliability and reduces system costs.

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    Maxwell Technologies’ 160V module is designed to provide energy storage and power delivery for wind turbine pitch control, short-term uninterrupted power supply (UPS) and renewable energy systems. Primarily designed for pitch control systems for 1.5 to 3MW wind turbines, the 160V module provides a turnkey solution to simplify the installation process and reduce costs for all integration partners.

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