Subject of the finishing paper is dynamic analysis of the capacitors support structure in Slavonija WI. Certain elements of the structure come into resonance area because of the fan work. It is necessary to confirm with calculation the safety of the capacitors support structure. In order to numerically compute the capasitors support structure, it is necessary to make a model. Model of the capacitors support structure is made in SolidWorks according to the technical documentation of „Đuro Đaković thermal power plant“ company. Condensers support structure is numerically computed in Ansys Workbench 15.0. Static analysis of the condensers support structure model is carried out in Anys. Values of the maximum displacement and stress are calculated. Safety of the structure is checked. After that the natural frequency and first 15 modes are calculated with modal analysis. To verify numerical calculation, the experimental measurments were carried on individual elements of the condensers support structure. RPM during the measurment was 375 r/min. The values of acceleration were measured experimentally. In GlyphXE diagrams of the acceleration were transformed in the FFT diagrams. The values of the natural frequency from measured elements can be read from the FFT diagrams. The resonance impact on the condensers support structure is also analitically tested. Calculation and experimental measurment succesfully verified that there is no risk during the work of the condenser support structure, regardless of system resonance.