TITLE:
Phasor Control of Converter Output Voltage for Frequency Regulation
AUTHORS:
Masahide Hojo, Ryo Ikeshita, Yoshinobu Ueda, Toshihisa Funabashi
KEYWORDS:
Self-Commutated Power Converter, Synchronous Generator, Frequency Control, Voltage Phasor
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.2 No.7,
July
21,
2014
ABSTRACT:
The synchronizing
torque of a power system may be weakened by increasing installation of static
power converters accompanied by renewable energy resources because they used to
trade their favorable active power by synchronizing their output voltage with
the one at the point of common coupling. In the circumstances, a concept of
Virtual Synchronous Machine (VSM) is proposed, where the self-commutated power
converters are emulating synchronous generators. This paper describes a
converter control to contribute to enhancing the synchronizing torque. The
proposed control is similar to the VSM but it simply realizes active power
trades among power generation units including converter-based generators by
modulating phase angles of their output voltages. Therefore, it can provide an
effective support to regulate the system frequency where the total rated power
of the converter-based generators increases as much as the one of conventional
rotating generators like a microgrid. This paper especially focuses on its
robustness where the number of converter-based generators is increased or they
are dispersed in the power network. The effectiveness is verified by simulation
study based on instantaneous values.