| 11. |
- Chompoobutrgool, Yuwa, et al.
(författare)
-
Persistence of Multiple Interaction Paths for Individual Inter-Area Modes
- 2012
-
Ingår i: IFAC Proceedings Volumes (IFAC-PapersOnline). - 9783902823243 ; , s. 14-19
-
Konferensbidrag (refereegranskat)abstract
- Dominant interaction paths are the passageways containing the highest modal content of particular oscillations in interconnected power systems. For the case of inter-area modes, pinpointing the dominant path that corresponds to each mode may allow for the extraction of signals that bear a significant modal content at a particular inter-area frequency. Strong modal content for these inter-area modes may also be spread onto secondary paths. These secondary paths bear similar properties as those shown by dominant paths. The aim of this study is thus to demonstrate the persistence of both dominant and secondary paths by employing “network modeshape” properties. The existence of the paths is verified by nonlinear time-domain simulations where modal content at each inter-area frequency is extracted. The proper selection of feedback signals from the dominating paths may increase the flexibility of WAPODs by providing a number of signal choices to be used as backup in the presence of contingencies.
|
|
| 12. |
- Chompoobutrgool, Yuwa, 1984-, et al.
(författare)
-
Survey on Power System Stabilizers Control and their Prospective Applications for Power System Damping using Synchrophasor-Based Wide-Area Systems
- 2011
-
Ingår i: European transactions on electrical power. - : John Wiley & Sons. - 1430-144X .- 1546-3109. ; 21:8, s. 2098-2111
-
Tidskriftsartikel (refereegranskat)abstract
- Powersystemoscillationdampingremains as one of the major concerns for secure and reliable operation of largepowersystems, and is of great current interest to both industry and academia. The principal reason for this is that the inception of poorly-damped low-frequency inter-areaoscillations (LFIOs) whenpowersystemsare operating under stringent conditions may lead tosystem-widebreakups or considerably reduce thepowertransfers over critical corridors. With the availability of high-sampling rate phasor measurement units (PMUs), there is an increasing interest for effectively exploiting conventionaldampingcontroldevices, such aspowersystemstabilizers(PSSs), by using these measurements ascontrolinput signals. In this paper, we provide a comprehensive overview of distinct elements (or "building blocks") necessary forwide-areapowersystemdampingusing synchrophasors and PSSs. These building blocks together shape a tentative methodical framework, and are disposed as follows: (1) fundamental understanding of the main characteristics of inter-areaoscillations, (2)wide-areameasurement andcontrolsystems(WAMS and WACS) andwide-areadampingcontrol(WADC), (3) advanced signal processing techniques for mode property identification, (4) methods for model-basedsmall-signal analysis, (5)controlinput signals selection, and (6) methods for PSScontroldesign. We also describe the latest developments in the implementation ofsynchrophasormeasurements in WAMS and WACS as well as their prospectives for WADCapplications. This paper serves both to abridge the state-of-the-art in each of these elements, and to accentuate aspiring ideas in each building block.
|
|
| 13. |
- Chompoobutrgool, Yuwa, et al.
(författare)
-
Using PMU signals from dominant paths in power system wide-area damping control
- 2015
-
Ingår i: Sustainable Energy, Grids and Networks. - : Elsevier. - 2352-4677. ; 4, s. 16-28
-
Tidskriftsartikel (refereegranskat)abstract
- This article presents a comprehensive study of dominant inter-area oscillation path signals and their application for power system wide-area damping control (WADC). The analysis, carried out on both small and large study systems, focuses on the relationships that emerge from physical characteristics of inter-area oscillations, namely the modal observability of signals from dominant paths and their corresponding control loop system properties (i.e. stability and robustness). The aim is to be able to appropriately exploit the dominant path signals for the mitigation of inter-area oscillations. Guidelines and considerations are provided to facilitate the design of WADC using the proposed approach.
|
|
| 14. |
- Danielson, Magnus, et al.
(författare)
-
Analysis of Communication Network Challenges for Synchrophasor-Based Wide-Area Applications
- 2013
-
Ingår i: Proceedings of IREP Symposium. - : IEEE conference proceedings. - 9781479901999
-
Konferensbidrag (refereegranskat)abstract
- Wide-area synchrophasor applications inherently depend on the underlying IT and communications infrastructure supporting them. In particular, closed loop control systems for power grid oscillation damping is problematic, as it is a complex mixture of power grid monitoring, communication network properties and overall system stability issues. This article offers a holistic analysis of these fields, proposing a combined requirement on the full system: to keep system delays down to maintain stability. Simulation results to support the analysis findings, also showing how observability of power oscillations is important in combination with system delays related to feedback signals, and finally laying out experimentation plans to be performed in the lab on a complex power-grid model with real PMUs, communication network and controllers interacting with the SmarTS Lab real-time hardware-in-the-loop simulator platform.
|
|
| 15. |
- Li, Wei, et al.
(författare)
-
Development and implementation of hydro turbine and governor models in a free and open source software package
- 2012
-
Ingår i: Simulation (San Diego, Calif.). - : Elsevier BV. - 1569-190X .- 1878-1462. ; 24, s. 84-102
-
Tidskriftsartikel (refereegranskat)abstract
- This article studies accurate and detailed hydro turbine and governor models, and implements these models in Power System Analysis Toolbox (PSAT)-a free and open source software. The implementation of these models in PSAT is approached using a general methodology, which is described in detail. To evaluate the performances of the developed hydro turbine and governor models, simulation studies are carried out on test systems of different scales, from a single-machine infinite-bus (SMIB) system to a larger system which includes 20 generators. Further more, transient stability analysis and small signal stability analysis are carried out to assess the performance of the implemented models.
|
|
| 16. |
|
|
| 17. |
- Sturk, Christopher, et al.
(författare)
-
Coherency-Independent Structured Model Reduction of Power Systems
- 2014
-
Ingår i: IEEE Transactions on Power Systems. - 0885-8950 .- 1558-0679. ; 29:5, s. 2418-2426
-
Tidskriftsartikel (refereegranskat)abstract
- This paper proposes a new model reduction algorithm for power systems based on an extension of balanced truncation. The algorithm is applicable to power systems which are divided into a study area which requires a high-fidelity model and an external area, making up most of the power system, which is to be reduced. The division of the power system can be made arbitrarily and does not rely on the identification of coherent generators. The proposed algorithm yields a reduced order system with a full non-linear description of the study area and a reduced linear model of the external area.
|
|
| 18. |
- Sturk, Christopher, et al.
(författare)
-
Structured Power System Model Reduction of Non-Coherent Areas
- 2012
-
Ingår i: Power and Energy Society General Meeting, 2012 IEEE. - : IEEE. - 9781467327275 ; , s. 6344913-
-
Konferensbidrag (refereegranskat)abstract
- This paper demonstrates how structured model reduction can be used to reduce the order of power systems without the need to identify coherent groups of generators. To this end the Klein-Rogers-Kundur 2-area system is studied in detail. It is shown how different modes of the system are captured as the model order is varied, which is of interest in e.g. distributed controller design, where the objective is to damp these oscillations. The power system is divided into a study area and an external area and the proposed algorithm is used to reduce the external area to a low order linear system, while retaining the nonlinear description of the study area. It is shown that this approach permits greater deviations from the steady-state than if a reduced system that is entirely linear is used, while still yielding accurate simulation results.
|
|
| 19. |
- Vanfretti, Luigi, 1981-, et al.
(författare)
-
Interarea Mode Analysis for Large Power Systems using Synchrophasor Data
- 2013
-
Ingår i: Power System Coherency and Model Reduction. - New York : Springer. - 9781461418023 - 9781461418030 ; , s. 259-295
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Interarea oscillations are predominantly governed by the slower electromechanical modes which, in turn, are determined by the coherent machine rotor angles and speeds. The issue is that, although these rotor angles and speeds provide the best visibility of such modes, currently they are not available from phasor measurement units (PMU). As such, the aim of this chapter is to demonstrate that interarea oscillations are observable in the network variables, such as voltages and line currents, which are measured by PMU. By analyzing the electromechanical modes in the network variables, we can trace how electromechanical oscillations are spread through the power network following a disturbance. Applying eigenvalue and sensi- tivity analysis, we provide an analytical framework to understand the nature of these network oscillations through a relationship termed network modeshapes. Using this relationship, a novel concept, “dominant interarea oscillation paths,” is developed to identify the passageways where the interarea modes of concern travel the most. We demonstrate the concept of the dominant path with an equivalent two-area sys- tem. We propose an algorithm for identification of the dominant paths and illustrate with a reduced model of a large-scale network. Finally, we end this chapter with an important application of the concept: feedback input signal selection for damping controller design.
|
|
