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186 Modern Control of DC-Based Power Systems
Figure 5.52 ISPS I L15L25L3 AdaptBS for ideal CPL and 30.9 - 53.4 MW.
remains stable and reaches the voltage set-points that are gradually modi-
fied by the action of the droop control. In Fig. 5.52 one can observe the
transient for the current.
5.7 H N OPTIMAL CONTROL (CONTRIBUTOR SRIRAM
KARTHIK GURUMURTHY)
In this section, the application of H N optimal control to power
electronic converters is covered. An initial introduction to the history
articulating how the control was developed, its first application to a con-
trol problem in general, and then to a power electronic converter and
grid is covered. The fundamental concepts involved in H N optimal con-
trol are introduced and then a short example on how the method can be
applied to a simple power electronic converter is shown. Finally, imple-
mentation of the technique for a MVDC grid is undertaken and the sim-
ulation test cases show the validity and usefulness of such a control
technique from a power grid perspective.
5.7.1 Development of H N Control
The H N technique was first developed by Zames in the early 1980s
[66 68]. Throughout the 1980s various computation methods and topics
in linear matrix inequalities were undertaken and developed [69].A
