Environmental Engineering Reference
In-Depth Information
Chapter 6
Performance and Operation Management
6.1 General
Performance of the generators has been dealt with (Chap. 3) in steady state condition,
covering operation of three-phase machines on symmetrical supply of constant volt-
age, constant frequency and at constant rotational speed. Investigating transient phe-
nomena, unsymmetrical conditions, stability and behavior under control, however,
requires extended machine models, for which different methods are available.
Performance of power electronic devices was described (Chap. 4) for phase and
switch-mode controlled inverters also in steady-state condition, i.e. without input
and load disturbances, describing average operation characteristics. Adapted models
are required to model transient operation conditions.
This chapter describes suitable methods for system component modeling and
gives an introduction to system control and operation management.
6.2 System Component Models
6.2.1 Model Representation
6.2.1.1 Modal Component Transformations
To investigate operation conditions and transient phenomena in three-phase a.c. sys-
tems modal components are widely used [IEC62428]. Where inductive, resistive or
capacitive couplings between phase elements and lines occur, they are useful to sim-
plify description and calculation of these phenomena. The original time-dependent
quantities are transformed into modal components, to give decoupled impedances
and admittances.
Modal components are used for a.c. power systems, including electric machines.
Basics of definitions and methods are given in this chapter.
Original quantities g
1
,
g
2
,
g
3
and the modal components
g
M1
,
g
M2
,
g
M3
are
related to each other by the transformation equation:
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