By Abdelkrim Benchaib
The energy engineering area is dealing with large demanding situations, with an expanding curiosity in intermittent renewable energies that are enforcing significant technical barriers. working ever towards their limits, the industry-standard AC strength grids are topic to instabilities.
This publication offers an perception into DC grid structures, delivering attention-grabbing matters to good managed strength grids, unlike present AC structures which offer the best and such a lot financial connection approach for brief distances.
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Extra info for Advanced Control of AC / DC Power Networks: System of Systems Approach Based on Spatio-temporal Scales
3. Droop control An alternative control strategy is called droop control, where the DC voltage control is distributed over a number of converters, which simultaneously adapt their active power injections to deal with disturbed grid situations. There are many similarities between the voltage droop control and the frequency droop used in AC systems, where the load-dependent frequency variation is used as an input signal for the control system to adjust the generated power to meet the demand in all times.
DC power flow calculation The active power in each node is the product of its DC voltage and DC current. 2]. 3]. 4]. 4] gives the power injection at the slack converter and the DC voltages of all the VSCs operating in a constant active power injection mode. Therefore, after performing the DC power flow (PF), the voltage and active power injection of all the DC nodes in the MTDC grid will be perfectly specified. 4. 4. It is a common practice to include a transformer, but for the purposes of this study (where filters and other station equipment are not model), its representation is omitted.
7. Ratio control The DC voltage controlling stations share the generated power according to a certain ratio. Using this control strategy, the system operator could vary the power ratio between the participating terminals by changing the slope of the droop characteristic [VRA 12]. 7] Time Scale Control Tools 31 The approximation is due to the fact that DC voltage is considered to be the “same” in both converters; hence, the power share is approximately equal to the DC current ratio. The drawback of this control strategy is that communication is necessary if there are more than two DC voltage controlling stations.
Advanced Control of AC / DC Power Networks: System of Systems Approach Based on Spatio-temporal Scales by Abdelkrim Benchaib