Program Topic: FACTS

F2-2Friday 11:00-12:20

11:00 Mitigation of Ferroresonance in Line Commutated HVDC Converter Interconnected with Series Compensated Overhead Line Transmission System

Jwala Laxmi Narasimha Rao (ABB & ABB Global Industries and Services pvt ltd, India); Gaurav Bansal (ABB Global Industries and Services Private Limited, India); Soubhik Auddy (ABB Global Industries and Services pvt ltd, India)

Ferroresonance is a non-linear resonance which can typically occur when a saturable magnetizing inductance forms a resonance circuit with a capacitor. An example of such a resonance condition can be a system configuration where an overhead transmission line with series compensation terminates into an HVDC converter transformer. Such a configuration may lead to post fault ferroresonance oscillations. Mitigation of ferroresonance using converter controls is a simple and economically attractive solution when compared to other solutions such as installing additional equipment in the network. This paper proposes a damping controller to mitigate ferroresonance oscillations for a HVDC system.

11:20 A New Coordinated Design of UPFC Controller and PSS for Improvment of Power System Stability Using CPCE Algorithm

Amin Khodabakhshian (University of Isfahan, Canada); Mohammad Reza Esmaili (University of Isfahan, Iran); Mosayeb Bornapour (University of Isfahan, Iran)

This paper presents a new method for coordinately tuning the parameters of UPFC controller and power system stabilizer (PSS) as well as determining the PSS location to enhance the stability of power system by using a new hybrid particle swarm optimization based co-evolutionary cultural algorithm, so called culture-PSO-co evolutionary (CPCE). Nonlinear simulations are implemented on the IEEE 39-bus power system. The results imply the effectiveness of proposed method for damping out power system oscillations.

11:40 Comparison of Phase Shifting Transformer and Unified Power Flow Control Based Interphase Power Controllers

Khalid Elamari (Concordia University, Canada); Luiz A. C. Lopes (Concordia University, Canada)

The basic interphase power controller (IPC) presents the interesting features of simplicity and low cost despite being less flexible than most FACTS controllers. A compromise performance can be achieved by replacing the phase shifting transformers (PSTs) with a reduced rating unified power flow control (UPFC), also known as Unified Interphase Power Controller (UIPC). This comparison is the main goal of this paper. The control variables of the UPFC are computed based on an optimization procedure to minimize a given cost function. The results show not only the higher capability of the UIPC to control the current flow through the transmission line but also shows that the UIPC achieves his task with less losses.

12:00 Comparison of Modern STATCOM and Synchronous Condenser for Power Transmission Systems

Sergey Kynev (Siemens AG, Germany); Georg Pilz (Siemens AG, Germany); Heino Schmitt (Siemens AG, Germany)

This paper presents a comparison between Synchronous Condenser and STATCOM as a dynamic source of reactive power. It focuses on the differences in the operating principles, steady-state and dynamic performance. Although both devices are able to provide capacitive and inductive current to the network, the dynamic behavior is principally different. The difference in the amount of the injected current as a response to network contingencies is explained by means of V/I diagrams. Another factor is the speed of the response. To consider it, the comparison is done for two time periods – transient (0.5-1sec.) and an emergency period (few seconds) after a contingency occurs. The paper addresses the recent growing interest in synchronous condenser application, due to its unique ability to contribute to the system inertia and short-circuit power. This paper also includes the comparison of losses, since it is a growing concern and an important selection criterion between Synchronous Condenser and STATCOM.