LVRT Testing & Measurement Services

DEWI provides comprehensive Low Voltage Ride Through (LVRT) testing & measurement services
LVRT testing for wind, solar and combined heat and power systems

Before any generating plant can be connected to the grid, the system operator normally requires a certificate, which in turn requires the measurement of electrical characteristics and increasingly also verification of the plant’s Low Voltage Ride Through (LVRT) capability. DEWI offers LVRT testing and measuring services to determine the electrical characteristics and grid compatibility of wind turbines, solar inverters and other generation units/systems.

If a generating unit becomes disconnected from the grid during a voltage dip caused by grid faults, it can weaken the overall stability of the grid, even causing a ripple effect of instability. In the case of transient voltage instability of 1-2 seconds, Low Voltage Ride Through (LVRT) is required to keep the unit/plant connected and maintain grid integrity.

As alternative forms of energy become more prevalent, generation units such as wind turbines, photovoltaic inverters and combined heat and power systems (CHP) are increasingly being held to the same electricity grid codes governing conventional power plants. Tests are typically conducted for prototypes and referenced to IEC standards and other national grid codes.

LVRT Assessment

The scope of measurements covered in testing of electrical characteristics by DEWI include:

  • Power quality (flicker, harmonics, switching operations)
  • Control behaviour (active and reactive power, frequency behaviour, gradient restriction)
  • Grid protection ( disconnection from the grid)
  • Fault ride through testing


Efficient solutions from trusted industry leaders

DEWI (UL International GmbH) is a leading global technical expert in the energy industry, providing a broad range of safety and performance testing services. The combination of our technical expertise, in-depth industry knowledge and many years of experience has allowed us to position ourselves as a global, one-stop wind energy service provider who understands and can reliably meet the individual needs of each stakeholder. 

To fulfil LVRT requirements, DEWI carries out measurements and evaluations to determine the electrical characteristics and grid compatibility of wind turbines, solar inverters and of other generation units/systems. Specialised tests reveal the behaviour of the generation unit during LVRT dips, and measure compliance with respective requirements, including local grid codes.

DEWI operates voltage dip-testing equipment for small units up to approximately 3.5 MW, for medium voltage up to 20 kV, and generation units up to 10 MW at voltages up to 35 kV.

DEWI also gives manufacturers the choice of having their generating unit evaluated and certified for compliance with individual or multiple specific grid interconnection standards and codes, including high voltage and zero voltage ride through.

Service operation description

DEWI services for wind and beyond

In addition to LVRT services, DEWI’s range of professional on- and offshore services for the wind industry include site evaluation, design evaluation, type testing and certification, wind measurement, energy yield assessment, technical due diligence, turbine assessment and inspection, power curve verification, site classification and research.

DEWI is committed to expanding their global service portfolio to provide flexible and comprehensive expertise precisely targeted to the needs of manufacturers and other stakeholders, such as developers and project owners/operators.

Tell us your needs. We are eager to help you find a solution.




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