Transient Overvoltage Analysis in HVDC MMC Power Cables: Assessment of the Critical Points

Analysis of influence of energy storage system parameters on HVDC commutation failure overvoltage

“…By comparing formula (2) and formula (7), the direction of capacitor voltage and bridge arm current is different. Due to the counter-electromotive force action of the module capacitor, the current drops to a value approaching 0 in a few milliseconds, at which time there are two paths as shown in Figure 4.…”

“…At present, a large number of studies have been done at home and abroad on the problems related to the commutation failure of HVDC system and energy storage [3][4][5][6][7] . Among them, literature [3] has analyzed the correlation between the transient overvoltage level and the short-circuit ratio of converter station, the shortcircuit capacity of converter station, and the voltage control capability of near-area system and the safety control.…”

“…Literature [7] studies that the energy storage system improves the steady-state transmission power of the UHV transmission channel and, as a cross-region standby source, reduces the start-up of the thermal power unit at the sending end to increase the new energy generation space. The above literature analyzed the transient overvoltage problem of high-voltage transmission system and the DC commutation failure based on energy storage technology, but did not study the influence of energy storage system parameters on the commutation failure overvoltage.…”

Reliability Assessment of a Multi-State HVDC System by Combining Markov and Matrix-Based Methods

“…In particular, the VSC-based HVDC links currently are living a continuous boost due to their key features: in combination with cross-linked-polyethylene-extruded (XLPE) cables, VSC-HVDC technologies are able to provide vital services for the electrical grids, such as the frequency or the voltage regulation ones [12][13][14][15]. The use of overhead lines or submarine/underground cables, or a combination of them, generates different issues and have pros and cons depending on the type of application [16][17][18]. Effective reliability and availability assessment tools [19][20][21][22][23][24][25][26][27][28][29][30] are of paramount importance in order to safely manage a whole HVDC-VSC link and to minimize the system outage risk.…”