By Abdelkrim Benchaib
The energy engineering area is dealing with large demanding situations, with an expanding curiosity in intermittent renewable energies that are implementing significant technical boundaries. working ever in the direction of their limits, the industry-standard AC strength grids are topic to instabilities.
This publication provides an perception into DC grid structures, delivering fascinating matters to good managed strength grids, unlike present AC structures which offer the best and so much financial connection approach for brief distances.
Read or Download Advanced Control of AC / DC Power Networks: System of Systems Approach Based on Spatio-temporal Scales PDF
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Additional resources for Advanced Control of AC / DC Power Networks: System of Systems Approach Based on Spatio-temporal Scales
Under nominal conditions, Vdc is approximately equal to its nominal value, meaning that the way to get almost the same behavior is to have a factor near to two between the voltage/power droop constant and the voltage/current droop constant as: ݇ூ ൎ ʹ݇ Generally, it is worth noting that, to get precise results and not confound the power with the current, one droop characteristic has to be chosen. A set point given by the DC voltage ܸௗǡ and power ܲௗǡ or current ܫௗǡ for the converters under voltage droop control is introduced.
The DC power flow (DC PF) calculation can be used to find the starting point for dynamic analysis, considering that the VSC-MTDC system is operating under a centralized DC voltage control such as master/slave (M/S), where only one converter (known as slack converter) is designated to keep the DC voltages in a close band around its rated value through active power compensation. Once more, an outstanding difference between the AC and DC systems must be kept on sight. In an AC transmission system, where the line 4 Advanced Control of AC/DC Power Networks resistances are neglected given the inductance higher values, the active PF is dominated by the angle differences between different buses, while the reactive PF is mainly associated with the voltage magnitude deviation of different nodes [KUN 94].
1. 2. Therefore, DC power (and current) are considered as positive when they are being injected into the DC grid. 2. 2. DC side model In steady state, the DC network is modeled by the link resistances (Rij). 3. 3. 1]. 3. 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.