In November, E&A considerably expanded its own capabilities in the planning and analysis of electrical supply networks. This applies to public supply networks as well as to industrial networks and supply networks of infrastructure facilities. We will be able to offer our customers the following additional calculation and analysis methods in the future:
The harmonic analysis enables an assessment of the voltage quality and allows conclusions to be drawn about the load on electrical equipment such as transformers, cables and switchgear. These considerations are necessary, for example, for the construction of new plants with drives operated by converters or also for generators (PV plants, wind parks, etc.).
Filter dimensioning for harmonic reduction
If the harmonic analysis reveals an increase in the normatively permissible limit values for harmonics, the use of filters for harmonic reduction is unavoidable. For filter dimensioning, it is necessary, among other things, to determine the resonance points in the network. After analysis of the mains impedance in the frequency response, the required filter for harmonic reduction can be dimensioned.
Simulation of transient switching operations
EMT simulation (electromagnetic transients) can be used to simulate the effects of transient switching processes on the network. The switching on and off of transformers, generators or capacitor banks can be exactly analyzed and evaluated with this tool.
With the RMS simulation, the grid can be represented with controlled energy feeds (CHP, wind farms, photovoltaic plants) including controllers and tested for stability in all modifications. A practical example is the transition of an industrial grid from grid operation to island operation with supply via a grid backup system. Here, the reaction of the network to connections or occurring faults and the resulting control deviation can be analysed. The simulation of a block-type thermal power station for an occurring short-circuit event enabled statements to be made about electrical parameters at the generator, as well as the evaluation of the control behaviour and the determination of operating limits.