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Register a new userReducing BESS Capacity for Accommodating Renewables in Subtransmission Systems with Power Flow Routers
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Widespread utilization of renewable energy sources (RESs) in subtransmission systems causes serious problems on power quality, such as voltage violations, leading to significant curtailment of renewables. This is due to the inherent variability of renewables and the high R/X ratio of the subtransmission system. To achieve full utilization of renewables, battery energy storage systems (BESSs) are commonly used to mitigate the negative effects of massive fluctuations of RESs. Power flow router (PFR), which can be regarded as a general type of network-side controller, has also been verified to enhance the grid flexibility for accommodating renewables. In this paper, we investigate the value of PFR in helping BESSs for renewable power accommodation. The performance of PFR is evaluated with the minimum BESS capacity required for zero renewable power curtailment with and without PFRs. The operational constraints of BESSs and the terminal voltage property of PFRs are considered in a multi-period optimization model. The proposed model is tested through numerical simulations on a modified IEEE 30-bus subtransmission system and a remarkable result shows that 15% reduction of BESS capacity can be achieved by installing PFRs on a single line.
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This paper proposes a robust transient stability constrained optimal power flow problem that addresses renewable uncertainties by the coordination of generation re-dispatch and power flow router (PFR) tuning.PFR refers to a general type of network-side controller that enlarges the feasible region of the OPF problem. The coordination between network-side and generator-side control in the proposed model is more general than the traditional methods which focus on generation dispatch only. An offline-online solution framework is developed to solve the problem efficiently. Under this framework the original problem is significantly simplified, so that we only need to solve a low-dimensional deterministic problem at the online stage to achieve real-time implementation with a high robustness level. The proposed method is verified on the modified New England 39-bus system. Numerical results demonstrate that the proposed method is efficient and shows good performance on economy and robustness.
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We present an omnidirectional wireless power transfer (WPT) system capable of automatic power flow control using three orthogonal transmitter (Tx)-repeater (Rp) pairs. The power drawn from each transmitter is automatically adjusted depending on the mutual inductance between the receiver and the Tx-Rp pair. The proposed approach enables the receiver to harvest almost uniform power with high efficiency (90%) regardless of its position.
The effective allocation of cross-border trading capacities is one of the central challenges in implementation of a pan-European internal energy market. Flow-based market coupling has shown promising results for to achieve better price convergence between market areas, while, at the same time, improving congestion management effectiveness by explicitly internalizing power flows on critical network elements in the capacity allocation routine. However, the question of FBMC effectiveness for a future power system with a very high share of intermittent renewable generation is often overlooked in the current literature. This paper provides a comprehensive summary on FBMC modeling assumptions, discusses implications of external policy considerations and explicitly discusses the impact of high-shares of intermittent generation on the effectiveness of FBMC as a method of capacity allocation and congestion management in zonal electricity markets. We propose to use an RES uncertainty model and probabilistic security margins on the FBMC parameterization to effectively assess the impact of forecast errors in renewable dominant power systems. Numerical experiments on the well-studied IEEE 118 bus test system demonstrate the mechanics of the studied FBMC simulation. Our data and implementation are published through the open-source power market tool POMATO.
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