Damping Controller Designs to Suppress Inter-area Oscillations in Power Systems by Using Novel Eigenstructure-based Indexes

Damping Controller Designs to Suppress Inter-area Oscillations in Power Systems by Using Novel Eigenstructure-based Indexes

Author: Deping Ke

Publisher:

Published: 2012

Total Pages: 164

ISBN-13:

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Firstly, a tuning scheme is proposed to coordinate wide-area signals based PSSs and SDCs for FACTS devices to mitigate inter-area oscillations with optimal control efforts under multiple operating conditions. This involves minimizing of an eigenstructure-based index which measures the dynamic performance of inter-area oscillations and control efforts together. Here, PSSs and SDCs are simple controllers with structural constraints, for consideration their applications in practice. Besides, SDCs and PSSs are simultaneously tuned by another proposed two-stage optimization method named IAMO-PS where an inter-area mode oriented pole placement strategy is implemented for damping of inter-area oscillations in the first stage while control efforts measured by eigenstructure-based indexes are coordinated under the constraints of such pole placement in the second stage. Subsequently, it is emphasized in this thesis that wind turbines employing doubly fed induction generators (DFIGs) have to sacrifice their dynamic performance as they are controlled to suppress inter-area oscillations. Thereby, a dual-channel SDC is proposed and tuned to drive the DFIG to offer the required damping to inter-area modes by using the method of IAMO-PS with optimizing of weighted control efforts of active and reactive power modulation, measured by eigenstructure-based indexes. Consequently, the DFIG dynamics are apparently improved because of their tight relationship with the optimized power outputs. The effectiveness of the proposed eigenstructure-based indexes and the associated tuning methods are validated in the classic two-area systems and New England and New York interconnected systems.


Analysis and Damping Control of Power System Low-frequency Oscillations

Analysis and Damping Control of Power System Low-frequency Oscillations

Author: Haifeng Wang

Publisher: Springer

Published: 2016-03-30

Total Pages: 403

ISBN-13: 1489976965

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This book presents the research and development results on power systems oscillations in three categories of analytical methods. First is damping torque analysis which was proposed in 1960’s, further developed between 1980-1990, and widely used in industry. Second is modal analysis which developed between the 1980’s and 1990’s as the most powerful method. Finally the linearized equal-area criterion analysis that is proposed and developed recently. The book covers three main types of controllers: Power System Stabilizer (PSS), FACTS (Flexible AC Transmission Systems) stabilizer, and ESS (Energy Storage Systems) stabilizer. The book provides a systematic and detailed introduction on the subject as the reference for industry applications and academic research.


Inter-area Oscillations in Power Systems with Uncertainties

Inter-area Oscillations in Power Systems with Uncertainties

Author: Ilias Zenelis

Publisher:

Published: 2022

Total Pages:

ISBN-13:

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"The steadily increasing load demand and the liberalization of electricity supply industry have resulted in heavy power trades over the weak tie lines of modern wide-area power grids. This effect, compounded by the slow addition of new transmission facilities, introduces numerous stability challenges. Among them, poorly-damped inter-area oscillations pose a serious threat to safe power system operation and may lead to cascading outages and blackouts. Nowadays, power networks are complex and experience various types of uncertainties causing model inaccuracies. Thus, it is understood that conventional model-based inter-area mode monitoring and control philosophy requires reconsideration. These ideas determine the scope of this thesis, which mainly focuses on the design of data-driven damping control strategies for inter-area modes. Recognizing the potential of recently developed Wide-Area Measurement System (WAMS) technology to provide a coherent picture of the entire network in real time based on Phasor Measurement Unit (PMU) data, this work proposes two Wide-Area Damping Control (WADC) algorithms against inter-area oscillations. Execution of the proposed schemes involves the online identification of the dynamic system state matrix from PMU measurements. A novel centralized participation factor-based WADC that can target multiple inter-area modes without affecting the rest of the modes is firstly presented. It is completely independent of the network model knowledge, while only requiring the generator inertia and damping constants as known parameters. The advantage of such control over model-based WADC is its capability to quickly adapt to operating condition variations. Additionally, the developed WADC algorithm does not require offline training, is adaptive to the selection of the PMU dataset and can be mapped to the actual power network dynamics. In order to bypass the high communication requirements and computational burden of centralized control architectures, a novel Modal Linear Quadratic Regulator (MLQR)-based sparse optimal WADC is also proposed. This methodology is purely data-driven and can directly shape the closed-loop damping features of every weakly-damped inter-area mode. Moreover, it takes into account the communication network constraints of WAMSs and demonstrates comparable performance to model-based and centralized model-free WADC. Finally, the thesis addresses the issue of small-signal stability monitoring degradation caused by high penetration of intermittent wind generation. A new data-driven Energy Storage System (ESS)-based algorithm is introduced and contributes a wind power balancing policy to improve the inter-area mode monitoring, and thus the WADC effectiveness. Case studies on the IEEE 39-bus, 68-bus and 145-bus benchmark systems validate the performance of the proposed WADC and ESS techniques"--


Computational Intelligence and Information Technology

Computational Intelligence and Information Technology

Author: Vinu Das

Publisher: Springer Science & Business Media

Published: 2013-01-02

Total Pages: 900

ISBN-13: 364225733X

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This book constitutes the proceedings of the First International Conference on Computational Intelligence and Information Technology, CIIT 2011, held in Pune, India, in November 2011. The 58 revised full papers, 67 revised short papers, and 32 poster papers presented were carefully reviewed and selected from 483 initial submissions. The papers are contributed by innovative academics and industrial experts in the field of computer science, information technology, computational engineering, mobile communication and security and offer a stage to a common forum, where a constructive dialog on theoretical concepts, practical ideas and results of the state of the art can be developed.


A Centralized Wide Area Control of Facts for Damping Power System Inter-area Oscillations

A Centralized Wide Area Control of Facts for Damping Power System Inter-area Oscillations

Author: Hany Ahmed Abdelsalam Ahmed

Publisher:

Published: 2011

Total Pages: 200

ISBN-13:

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Flexible AC Transmission Systems (FACTS) control for damping power system inter-area oscillations is a topic of much interest. However, local decentralized FACTS controllers are either too complicated to be realizable or do not offer satisfactory performance under various system operating conditions. This research develops a procedure for designing a centralized Wide Area Controller (WAC) for FACTS based on the H [infinity] method. The H [infinity] control can guarantee robust performance by minimizing the effect of certain disturbances on the inter-area oscillations. This dissertation presents a new disturbance selection method under the H [infinity] method. A transformation of the disturbance vector is derived based on the response magnitude of the inter-area modes, which significantly reduces the number of disturbances to be rejected by the controller and decreases the computational time and memory for large power systems. The proposed method is applied to the IEEE 16-machine 5-area study system with multiple FACTS devices. The results demonstrate the effectiveness of the proposed method in design of FACTS H [infinity] - WAC for large power systems.


Inter Area Oscillation Damping in Large Scale Power Systems with Unified Power Flow Controllers

Inter Area Oscillation Damping in Large Scale Power Systems with Unified Power Flow Controllers

Author: Mahyar Zarghami

Publisher:

Published: 2008

Total Pages: 330

ISBN-13:

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"Power system oscillations occur in power networks as a result of contingencies such as faults or sudden changes in load or generation. They are detrimental to the operation of the system since they affect system stability and the optimal power flow through it. These oscillations do not usually damp out in tie-lines unless certain controls are applied to the system. Local and inter-area oscillations have traditionally been controlled by Power System Stabilizers (PSS). However, Flexible Alternating Current Transmission Controllers (FACTS) have significant potential as alternatives to PSS. The main goal of this research is to damp inter-area oscillations by Unified Power Flow Controllers (UPFC). UPFC is a series-shunt FACTS device which is used for purposes such as the control of active and reactive power flow through the corridors of the system. However, using supplementary controls and proper coordination of UPFCs, they can be used for fast damping of inter-area oscillations in multi-area power systems"--Abstract, p. iv.