Using Effective Generator Impedance for Forced Oscillation Source Location

Application of unknown input observers to locate forced oscillation source

“…16 Time domain responses of forced oscillation are analyzed, and its unique properties are used to detect forced oscillation in Ye et al 17 More specifically, methods for locating forced oscillation sources are proposed recently in the literatures. [18][19][20][21][22][23][24][25][26][27] Wang and Sun18 gives a comprehensive review of the location methods and elaborates on their advantages and disadvantages. Typical existing methods can be mainly summarized as hybrid simulation method, 19 energy-based methods, [20][21][22][23] damping torque methods, 24,25 mode shape estimation methods, 25,26 effective generator impedance method, 27 etc.…”

“…22,28 Tang et al, Maslennikov et al, and Feng et al21-23 have developed the classic energy-based method into more robust methods and achieved more detailed location results. A model-based method which uses effective generator impedance to locate oscillation source is proposed in Chevalier et al 27 It represents a source generator as an effective admittance matrix and an effective current source. Generator current spectrums obtained by the impedance matrix can indicate the presence of oscillation source.…”

“…The comparison results are hardly surprising: the knowledge of the system model used in the proposed method helps to improve the location results in some cases. It is straightforward to use system model to generate model responses to locate oscillation source, which is also the basic idea for the model-based approaches in Wang and Sun and Chevalier et al 18,27 In contrast, the energy-based method should be praised for requiring only measured responses to locate oscillation source.…”

A Synchrophasor Data-Driven Method for Forced Oscillation Localization Under Resonance Conditions

“…If a PMU measurement far away from the source measurements is tightly coupled with the eigenvalue λ j * , it may manifest the most severe oscillation, thereby confusing system operators with regards to FO source localization. Therefore, the presence of resonance components may cause the counter-intuitive cases defined by (7), (8). 2) Location information on FO source from the resonancefree component: As the resonance components of the set of all PMU measurements mislead system operators with respect to FO localization, we proceed by excluding the resonance component from (22), and checking whether if the remaining components exhibit any spatial information concerning the FO source.…”

“…In spite of the promising performance of the energybased method [2], the rather stringent assumptions pertaining to knowledge of load characteristics and the grid topology may restrict its usefulness to specific scenarios [6], [7]. In [8], the oscillation source is located by comparing the measured current spectrum of system components with one predicted by the effective admittance matrix. However, the construction of the effective admittance matrix requires accurate knowledge of system parameters that may be unavailable in practice.…”