Damping Performance Analysis of IPFC and UPFC Controllers Using Validated Small-Signal Models

Abstract

The paper discusses the dynamic behavior of two different flexible ac transmission system devices; the interline power-flow controller (IPFC) and the unified power-flow controller (UPFC) in a benchmark system. The small-signal model of the interline power-flow controller is developed and validated using detailed electromagnetic transients simulation. Using this validated model, the damping capabilities of the IPFC and the UPFC are compared and rationalized. From a small-signal dynamics point of view, it is shown that the series branches of these devices essentially segment the network creating a new structure. This structure change may be used to effectively improve system damping without requiring the design of a tuned feedback controller. The IPFCs two series branches in contrast to the UPFC's single series branch permit more opportunities for network segmentation. Hence, the IPFC has greater potential for improving the system's dynamic performance.Index Terms-Decoupled control, electromagnetic transients (EMT), flexible ac transmission system (FACTS), interline power-flow controller (IPFC), small-signal stability, unified power-flow controller (UPFC).

Challenges and opportunities of FACTS devices interacting with electric vehicles in distribution networks: A technological review

“…The IPFC and the UPFC are two separate FACTS devices that are discussed in this study [101]. During power flow modeling of an IPFC, the complexity of computer program codes for Newton-Raphson load flow (NRLF) analysis is frequently increased [102].…”

UNIFIED POWER FLOW CONTROLLER CONTROL STRATEGIES for POWER FLOW

“…Where the injected shunt voltage in-phase or anti-phase with the bus voltage. 14,20,24,25 Where is the sending-end Voltage V sd is the sending end voltage in d-axis V sq is the sending end voltage in q-axis is the current injection is the receiving-end Voltage δ = δ s -δ r is the difference angle X sh is the shunt reactance is the shunt current injection is the STATCOM Voltage V rd is the receiving end voltage in d-axis V rq is the receiving end voltage in q-axis At the sending-end bus, the power is given by Then, the active and reactive power at the sending-bus "s" is given by: So, the power injected by the shunt converter is given by: Finally, the active and reactive power injected by the shunt converter is given by: However, the terminal voltage is given by: The in-phase and the quadrature shunt voltages are:…”

“…The UPFC linearized model can be found in. 19,20 J. B. Choo et al 21 presented an electromagnetic transmitted simulation model of UPFC, and applied this model to analyze the effectiveness of its operation in the power system.…”

Design of a Damping Controller Using the SCA Optimization Technique for the Improvement of Small Signal Stability of a Single Machine Connected to an Infinite Bus System

“…Two FACTS shunt devices, static VAR compensators (SVC) and static synchronous compensators (STATCOM), have been used for damping to enhance small signal stability [10]. A damping performance analysis [11], dynamic control strategy to improve the power flow capabilities [12], and enhancement of the low voltage ride through capability in power systems [13] have also been described in the literature. In coordination control, PSS and FACTS devices with efficient coordination among controllers have been combined to dampen both types of oscillations in power systems, namely, local and inter-mode.…”