Two-Year Review of CHP Measurements based on TR3 Guidelines

Since 2014 the Fraunhofer ISE Test Lab Power Electronics offers measurements on combined heat and power plants (CHPs) as part of its services. This complements their many years of experience with certification measurements on photovoltaic inverters. Fraunhofer ISE has the measurement equipment as well as the infrastructure to carry out certification measurements in their laboratory as well as in situ. For the in situ measurements, a mobile low-voltage ride through (LVRT) test container is put into use, which can measure units of up to 4.5 MVA. Measurements can be performed at the Institute’s outdoor testing field or at the CHP location depending on the client’s needs.

Test engineers perform CHP measurements at the outdoor testing site
© Fraunhofer ISE
Test engineers perform CHP measurements at the outdoor testing site at Fraunhofer ISE.

At the beginning the special characteristics of CHP’s challenged the staff at the Test Lab Power Electronics.  However, over the last two years they were able to appreciably expand their know-how in this area. In this period over eight different CHP models were measured. The power ranged from 30 kVA for the smallest CHP to 400 kVA for an entire block. The engineers tested models with both asynchronous and synchronous generators. Biogas, natural gas but also wood gas were used as primary energy carriers. Over the past two years, the staff at the Test Lab Power Electronics has acquired a vast expertise in the area of CHP measurement technology, successfully delving into this broad field with its wide range of dimensions and technologies.

With its acquired know-how, highly professional measurement facilities and good contacts to the relevant certification bodies, Fraunhofer ISE can ensure CHP manufacturers optimal guidance and support for the TR3-based tests. Since modelling according to TR4 is also part of the portfolio at Test Lab Power Electronics, its test engineers are clearly the competent partner of choice in all areas of CHP unit certification.

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