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01.04.2017 12:27
Category: Allgemeine News

CWD infrastructure enables fault ride-through tests to be conducted on the test bench


Fault ride-through tests (FRT tests) have been successfully conducted using the CWD system test bench as part of the research project at the FVA Nacelle research wind turbine. To do so, test bench capabilities specially developed to emulate the electrical grid were used for the first time.

The dynamics and extent of voltage dips emulated at the grid connection point can be adjusted during the testing process using country-specific national standards. The FVA Nacelle studies were conducted in line with the FGW-TR3 technical guideline applicable in Germany and its appendix relating to system test benches for wind energy. The CWD FRT tests are amongst the first of their kind to be conducted on a system test bench. Previously, similar investigations were performed at great cost and effort on site and were therefore always subject to the changing weather conditions.

Test results were continuously integrated into ongoing investigations concerning certification frameworks for wind turbines on system test benches. Preliminary evaluations show that the basic conditions set for test bench testing and the resulting requirements for test benches were successfully fulfilled.

The CWD system test bench applies mechanical and electrical loads to wind turbine nacelles: mechanical loads act on the rotor hub; electrical loads affect the generator terminals or the nacelle converter. Both system interfaces can be controlled by real-time-capable simulations. This enables multi-physical power-hardware-in-the-loop test bench environments to be implemented in close cooperation between mechanical and electrical engineers.

On the test bench, multiple parallel medium-voltage converters combined with a multi-winding transformer emulate the behaviour of the electrical grid and the stated voltage dips. This arrangement enables voltages to be applied both dynamically and with great precision.

Voltage dips of varying degrees and durations can be emulated under various load conditions (idling to full load) and phases (symmetrical and asymmetrical) during FRT tests. In all test scenarios, the quality and dynamics of the voltages generated by the test bench converter system were in line with targets previously set by the engineers involved when designing the test runs.