Universal Wide-area Damping Control for Mitigating Inter-area Oscillations in Power Systems

Lian, Jianming; Wang, Shaobu; Elizondo, Marcelo; Hansen, Jesper Rohr; Huang, Renke; Fan, Rui; Kirkham, Harold; Marinovici, Laurentiu; Schoenwald, D.A.; Wilches-Bernal, Felipe

doi:10.2172/1524246

Cited by 7 publications

(15 citation statements)

References 47 publications

(43 reference statements)

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“…However, this technique requires the participation of significant end-user loads to achieve satisfactory performance, which may not be readily available at the instant of need. Moreover, the controllers need to be frequently reconfigured to capture changes in the load and network configuration [25]. An effective solution for damping LFOs is the deployment of power system stabilizers (PSSs) on SGs.…”

Section: Introductionmentioning

confidence: 99%

Impact of Virtual Synchronous Machines on Low-Frequency Oscillations in Power Systems

Baruwa

Fazeli

2021

IEEE Trans. Power Syst.

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The low-frequency oscillations (LFOs) inherent in power systems will be impacted by the increasing penetration of renewable energy sources (RESs). This paper investigates the impact of virtual synchronous machine (VSM) based RESs on the LFOs in power systems. A detailed two-machine test-bed has been developed to analyze the LFOs which exists when VSMs replace synchronous generators. The characteristics of the LFO modes and the dominant states have been comprehensively analyzed. Furthermore, this study analyzes the LFO modes which exists in an all-VSM grid. The role of the power system stabilizers in the all-VSM grid has been comprehensively evaluated. The IEEE benchmark two-area four-machine system has been employed to corroborate the results of the small-signal analysis and observe the transient performance. The analysis in this paper have been performed in MATLAB/SIMULINK environment.

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Section: Introductionmentioning

confidence: 99%

Impact of Virtual Synchronous Machines on Low-Frequency Oscillations in Power Systems

Baruwa

Fazeli

2021

IEEE Trans. Power Syst.

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“…The idea of using end-use loads on the demand side to damp inter-area oscillations has been proposed previously [24]- [26]. In [24], [25] a novel device-level control strategy was proposed to deliver the aggregator-level load modulation signal.…”

Section: Introductionmentioning

confidence: 99%

Damping of Inter-Area Oscillations via Modulation of Aggregated Loads

Wilches-Bernal

Byrne

Lian

2020

IEEE Trans. Power Syst.

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Low frequency electromechanical oscillations can pose a threat to the stability of power systems if not properly addressed. This paper proposes a novel methodology to damp these inter-area oscillations using loads, the demand side of the system. In the proposed methodology, loads are assigned to an aggregated cluster whose demand is modulated for oscillation damping. The load cluster control action is obtained from an optimal output feedback control (OOFC) strategy. The paper presents an extension to the regular OOFC formulation by imposing a constraint on the sum of the rows in the optimal gain matrix. This constraint is useful when the feedback signals are generator speeds. In this case, the sum of the rows of the optimal gain matrix is the droop gain of each load actuator. Time-domain simulations of a largescale power system are used to demonstrate the efficacy of the proposed control algorithm. Two different cases are considered: a power imbalance and a line fault. The simulation results show that the proposed controllers successfully damp inter-area oscillations under different operating conditions and with different clustering for the events considered. In addition, the simulations illustrate the benefit of the proposed extension to the OOFC that enable load to provide a combination of droop control and small signal stability augmentation.

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“…By proving that the nonlinearity in the considered model is quadratically bounded, decentralized control framework considering nonlinear model of power systems are developed in [14]. The ideas from [14] are then extended by Lian et al [15] with applications to enhancement of damping ratios of the inter-area oscillation through decentralized robust control [15]. As for DSE methods, our recent work [3] assumes that a higher-order, multi-machine power system model is one-sided Lipschitz and quadratically inner-bounded.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Nonlinearity of Power System Generator Models

Nugroho

Taha

2019

2019 American Control Conference (ACC)

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Power system dynamics are naturally nonlinear. The nonlinearity stems from power flows, generator dynamics, and electromagnetic transients. Characterizing the nonlinearity of the dynamical power system model is useful for designing superior estimation and control methods, providing better situational awareness and system stability. In this paper, we consider the synchronous generator model with a phasor measurement unit (PMU) that is installed at the terminal bus of the generator. The corresponding nonlinear process-measurement model is shown to be locally Lipschitz, i.e., the dynamics are limited in how fast they can evolve in an arbitrary compact region of the statespace. We then investigate different methods to compute Lipschitz constants for this model, which is vital for performing dynamic state estimation (DSE) or state-feedback control using Lyapunov theory. In particular, we compare a derived analytical bound with numerical methods based on low discrepancy sampling algorithms. Applications of the computed bounds to dynamic state estimation are showcased. The paper is concluded with numerical tests.Index Terms-Synchronous generator, dynamic state estimation, phasor measurement units, Lipschitz nonlinearity, Lipschitz-based observer, low discrepancy sequence.

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Universal Wide-area Damping Control for Mitigating Inter-area Oscillations in Power Systems

Cited by 7 publications

References 47 publications

Impact of Virtual Synchronous Machines on Low-Frequency Oscillations in Power Systems

Impact of Virtual Synchronous Machines on Low-Frequency Oscillations in Power Systems

Damping of Inter-Area Oscillations via Modulation of Aggregated Loads

Characterizing the Nonlinearity of Power System Generator Models

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