Coherency based online wide area control of wind integrated power grid

IET Generation Trans & Dist

2020

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Interconnected power grid exhibits oscillatory response after a disturbance in the system. One such type of oscillations, the interarea oscillations has the oscillation frequency in the range of 0.1 to 1 Hz. The damping of inter-area oscillations is difficult with local controllers, but it can be achieved using a Wide Area Damping Controller (WADC). For effective control, the input to the WADC should be the most observable signal and the WADC output should be sent to the most controllable generator. This paper presents a measurement-based novel algorithm for multi-input-multi-output (MIMO) transfer function identification of the power system based on optimization to estimate such oscillation frequencies. Based on the MIMO transfer function the optimal control loop for WADC is estimated. The WADC design is based on the discrete linear quadratic regulator (DLQR) and Kalman filtering for damping of inter-area oscillations. Since the MIMO identification is based on actual measurements, the proposed method can accurately monitor changes in the power grid whereas the conventional methods are based on small-signal analysis of a linearized model which does not consider changing operating conditions. The overall algorithm is implemented and validated on a RTDS/RSCAD R and MATLAB R real-time co-simulation platform using two-area and IEEE 39 bus power system models.

Section: Optimal Wide Area Control Loop Selectionmentioning

confidence: 99%

“…where W and H are co-variance of measurement noise and observation matrix, respectively. The corrector step is presented as shown in (30) and (31)…”

Section: Kalman Filtering-based State Estimationmentioning

confidence: 99%

Measurement‐based wide‐area damping of inter‐area oscillations based on MIMO identification

IET Generation Trans & Dist

2020

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“…To increase the online coherency grouping speed, Nystrom method is used which uses sub-matrix of the dense matrix S [23]. The details regarding online coherency grouping methodology are discussed in [24]. It is worth noting that, the coherency grouping changes as the system operating condition changes, however in this paper the objective of coherency grouping is to divide the system into physical areas for implementing the proposed algorithm.…”

Section: A Dividing Large Scale Network Into Areasmentioning

confidence: 99%

Alternating Direction Method of Multipliers (ADMMs) Based Distributed Approach For Wide-Area Control

IEEE Trans. on Ind. Applicat.

2019

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In this paper, an ADMM based novel distributed wide-area control architecture is proposed for damping the interarea oscillations. In this approach, first, an interconnected power system is divided into areas based on coherency grouping. Second, local processors are assigned on each area that estimates a blackbox transfer function model based on Lagrange multipliers using measurements. These local area processors are then used to estimate a global transfer function model of the power system based on a consensus algorithm through a global processor. After convergence, a transfer function residue corresponding to the inter-area mode of interest is derived, to determine optimal wide area control loop. Finally, a wide-area damping controller is designed based on this information. The efficacy of the controller is validated using two area and IEEE-39 bus test systems on RTDS/RSCAD and MATLAB co-simulation platform.

“…Since, the goal here is to identify the frequency dependent admittance (Y f ), the boundary bus voltage and current are the required signals. FDNE is then formulated in z-domain using RLS [21], [22] by tracking input voltage and output current. The basic principle is as follows.…”

Section: Fdne Formulation and Real-time Simulator Integrationmentioning

confidence: 99%

Development and Applicability of Online Passivity Enforced Wide-Band Multi-Port Equivalents For Hybrid Transient Simulation

Ghosh

IEEE Trans. Power Syst.

2019

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