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Dynamic Model of Event-Triggered Multiarea Power Systems
Design of the LFC Scheme for Power Systems
Abstract: Load frequency control (LFC) is a very important method to keep the power systems stable and secure. However, due to the introduction of communication networks in multi-a... View more
Load frequency control (LFC) is a very important method to keep the power systems stable and secure. However, due to the introduction of communication networks in multi-area power systems, the traditional LFC method is not effective again. This motivates us to investigate an adaptive event-triggering H
∞
LFC scheme for multi-area power systems. Compared with the existing time-invariant event-triggering communication scheme, an adaptive event-triggering communication scheme is presented, where the event-triggering threshold can be dynamically adjusted to save more limited network resources, while preserving the desired control performance. Compared with the existing emulation-based method, where the controller must be known a priori, the stability and stabilization criteria derived in this work can provide a tradeoff to balance the required communication resources and the desired control performance. The effectiveness of the proposed method is verified by two numerical examples.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 65 , Issue: 2 , February 2018 )
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Load frequency control (LFC) has been effectively used in power systems to maintain frequency and power interchanges
with neighborhood areas at scheduled values for many years [1]–
[3]. For interconnected multiarea power systems, there are two methods to
connect the neighborhood areas: dedicated communication channels and open communication infrastructure. There is a
constant delay induced in dedicated communication channels, but such a delay is always ignored during the design and
operation of the LFC, since it is constant and small [4]. Compared with the
traditional LFC scheme with dedicated communication channels, the main advantages of the modern LFC scheme with open
communication infrastructure are low cost and flexible [2]. However, an open
communication network presents new challenges for the entities providing various ancillary services in that such
networks may be subject to time-varying network-induced delays, data losses, as well as out-of-order packets in the
communication channels. Therefore, during the last decade, much attention has been paid to analysis and design of the
LFC scheme of power systems with open communication infrastructure [5]
–[7]. Moreover, since there are many load and generation units to compete
for the limited communication and computational resources in the multiarea power systems, how to design the reasonable
communication and control schemes has also received increasing attention; see, for example,
[8], [9] and references therein.
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century
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