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A generic inertia emulation controller (INEC) scheme for multi-terminal voltage-source-converter (VSC)-based high voltage direct current (HVDC) systems is proposed in this study. The INEC can be incorporated in any grid-side VSC station, allowing the multi-terminal HVDC (MTDC) terminal to contribute an inertial response to connected AC systems during system disturbances, in a fashion similar to synchronous generators. The DC-link capacitors within the MTDC are utilised by the INEC scheme to exchange stored energy with the AC system by varying the overall DC voltage level of the MTDC network within a safe and pre-defined range. A theoretical treatment of the INEC algorithm and its implementation and integration within a conventional VSC control system are presented, and the impact on the total DC capacitance required within the MTDC network to ensure that DC voltages vary within an acceptable range is discussed. The proposed INEC scheme is validated using a MATLAB/SIMULINK model under various changes in demand and AC network faults. The model incorporates a multi-machine AC power system connected to a MTDC transmission system with multiple converter-interfaced nodes. The effectiveness of the INEC in damping post-fault oscillations and in enhancing AC grid frequency stability is also investigated.
References
-
-
1)
-
M. Kayikci ,
J.V. Milanovic
.
Dynamic contribution of DFIG-based wind plants to system frequency disturbance.
IEEE Trans. Power Syst.
,
2 ,
859 -
867
-
2)
-
D. Jovcic ,
N. Strachan
.
Offshore wind farm with centralised power conversion and DC interconnection.
IET Gener. Transm. Distrib.
,
6 ,
586 -
595
-
3)
-
15. Adam, G.P., Williams, B.W.: ‘Half and full-bridge modular multilevel converter models for simulations of full-scale HVDC links and multi-terminal DC grids’, IEEE J. Emerg. Sel. Top. Power Electron., (99), pp. 1–1. .
-
4)
-
18. Bennett, S.: ‘Development of the PID controller’, IEEE Trans. Control Syst., 1993, 13, (6), pp. 58–62 (doi: 10.1109/37.248006).
-
5)
-
6)
-
G. Lalor ,
A. Mullane ,
M. O'Malley
.
Frequency control and WT technologies.
IEEE Trans. Power Syst.
,
4 ,
1905 -
1913
-
7)
-
14. Novotny, D.W., Lipo, T.A.: ‘Vector control and dynamics of AC drives’ (Clarendon Press, 1996).
-
8)
-
17. Feltes, C., Wrede, H., Koch, F., Erlich, I.: ‘Fault ride-through of DFIG-based wind farms connected to the grid through VSC-based HVDC link’. PSCC 16th Power System Computation Conf., 2008, pp. 1–7.
-
9)
-
11. Green, T.C., Prodanovic, M.: ‘Control of inverter-based micro-grids’, Electr. Power Syst. Res., 2007, 77, pp. 1204–1213 (doi: 10.1016/j.epsr.2006.08.017).
-
10)
-
5. Miao, Z., Fan, L., Osborn, D., Yuvarajan, S.: ‘Wind farms with HVdc delivery in inertial response and primary frequency control’, IEEE Trans. Energy Convers., 2010, 25, (4), pp. 1171–1178 (doi: 10.1109/TEC.2010.2060202).
-
11)
-
3. Mokadem, M.E., Courtecuisse, V., Saudemont, C., Robyns, B., Deuse, J.: ‘Experimental study of variable speed wind generator contribution to primary frequency control’, Renew. Energy, 2009, 34, pp. 833–844 (doi: 10.1016/j.renene.2008.04.033).
-
12)
-
W. Lu ,
B.T. Ooi
.
Multiterminal LVDC system for optimal acquisition of power in wind-farm using induction generators.
IEEE Trans. Power Electron.
,
4 ,
558 -
563
-
13)
-
13. Anderson, P., Fouad, A.A.: ‘Power system control and stability’ (The Iowa State University Press, 1977).
-
14)
-
10. Zhu, J., Booth, C.D., Adam, G.P., Roscoe, A.J., Bright, C.G.: ‘Inertia emulation control strategy for VSC-HVDC transmission systems’, IEEE Trans. Power Syst., 2013, 28, (2), pp. 1277–1287 (doi: 10.1109/TPWRS.2012.2213101).
-
15)
-
J.F. Conroy ,
R. Watson
.
Frequency response capability of full converter wind turbine generators in comparison to conventional generation.
IEEE Trans. Power Syst.
,
2 ,
649 -
656
-
16)
-
L. Xu ,
L.Z. Yao ,
C. Sasse
.
Grid integration of large DFIG based wind farms using vsc transmission.
IEEE Trans. Power Syst.
,
3 ,
976 -
984
-
17)
-
7. Zhu, J., Booth, C.D.: ‘Future multi-terminal HVDC transmission systems using voltage source converters’. Proc. Int. Univ. Power Eng. Conf., Cardiff, UK, 2010, pp. 1–6.
-
18)
-
Y. Phulpin
.
Communication-free inertia and frequency control for wind generators connected by an HVDC-link.
IEEE Trans. Power Syst.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-rpg.2014.0109
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content/journals/10.1049/iet-rpg.2014.0109
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