Design and evaluation of a test rig for full-size grid frequency stabilizer modules with ultracapacitors

In order to stabilize the grid frequency in case of sudden loss of power generation, an injection of real power is needed. For this, a Static Var Compensator (SVC) can be combined with ultracapacitors, forming a grid frequency stabilizer. To prove the feasibility of this novel combination, the paper shows the realization of a 1 MW class test rig for full-size modules. Single modules are tested using a second module and connecting them at their AC front-end. The control of the AC/DC and DC/DC converters is described and the performance of the test field is shown in measurement results.