Robust Decoupled Outer-Control Design for Single VSC and HVDC Grid With Controller Weak AC System Interconnection

Dewangan, Lokesh; Bahirat, Himanshu J.

doi:10.1109/tpwrd.2021.3110326

Cited by 10 publications

(6 citation statements)

References 20 publications

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“…The required input information of the proposed algorithm includes the data set of the studied system U-I characteristics, C eq , and the external system equivalent model, SEE. A set of interpolated equations, F eq , is obtained to approximate the studied system U-I characteristic as expressed in (4), ( 5) and (6). Then, the system of equations modeling the complete system can be defined with F eq and a subset of external system equivalent model, SEE k , corresponding to a combination k. The operation point, OP , can be obtained by solving SEO k for each combination k ∈ [1, K] using the solution function defined previously.…”

Section: B Methodology To Identify Operation Pointsmentioning

confidence: 99%

Grid Equivalent Representation of Power Systems With Penetration of Power Electronics

Song

Cheah-Mañé

Prieto‐Araujo

et al. 2023

IEEE Trans. Power Delivery

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Section: B Methodology To Identify Operation Pointsmentioning

confidence: 99%

Grid Equivalent Representation of Power Systems With Penetration of Power Electronics

Song

Cheah-Mañé

Prieto‐Araujo

et al. 2023

IEEE Trans. Power Delivery

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“…However, these insights may not directly apply to VSCs connected to weak grids within MTDC grids, especially when droop voltage control is implemented, due to the potential of increased interactions among VSCs. The small-signal stability of an MTDC grid interfaced with weak ac systems was investigated in [34]- [36]. In [35], a methodology based on participation factor analysis was proposed to distinguish local and inter-area oscillation modes.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Dynamic Stabilization of a High-Voltage VSC-MTDC Grid With DC Power Flow Controller Connected to Extremely Weak AC Systems

Mohamed,

El-Saadany

2024

IEEE Open J. Power Electron.

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The high-voltage voltage-source converter (VSC)based multi-terminal dc (MTDC) grid is a key technology for integrating offshore wind energy and enabling bulk power transmission across nations and continents. This paper addresses the small-signal stability of an MTDC grid equipped with a power flow controller (PFC) under extremely weak ac system interconnections. Using a comprehensive linearized state-space model, eigenvalue analysis uncovers that, beyond the welldocumented low-frequency oscillations (LFO), an MTDC grid may experience unstable medium-frequency oscillations (MFO) under rectifier operation of droop voltage-controlled VSCs when interfaced to an extremely weak ac system. Moreover, it was shown that the most challenging scenario is when multiple droop voltage-controlled VSCs are interfaced to very weak ac systems, with unstable LFO and MFO observed at short-circuit ratio values of 1.4 and 1.8, respectively. Sensitivity analysis is conducted to assess the impact of the droop voltage control gains, PFC control parameters, and dc breaker reactor on the system dominant eigenmodes in such critical weak conditions. Simple yet efficient LFO and MFO compensators are proposed to stabilize the system, and their parameters design was detailed. Extensive simulation studies and real-time validation tests verify the analytical analysis and demonstrate the effectiveness of the proposed compensators and their feasibility for real-time implementation.

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“…The shortcoming of this method is its dependency on the system states, which increases redundancy degree as the system becomes larger, and this would be problematic in the controller design. In [26], impedance-based modelling and H ∞ techniques are employed to identify the coupling in the power loops that depends on the network inductance and system operating point. The robust controller tuning with pole-placement and minimization of H∞ norm is fulfilled for HVDC grids, which form a restricted feedback system.…”

Section: Introductionmentioning

confidence: 99%

Design of a new robust controller for voltage regulation of DC link in wind‐farm‐side converter integrated with a hybrid AC and DC large‐scale power system

Bagheri

Yousefi

2023

IET Generation Trans & Dist

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The main aim of this paper is to improve dynamic performance of a multi-terminal DC (MTDC) grid in a wind-integrated AC power system through DC voltage control. The proposed approach is based on design of robust H ∞ controller and loop shaping along with mutual quality decomposition method (MQDM). For extracting transfer function of the plant, model of Master-Slave control system is converted to standard feedback control system. Then, based on the obtained difference between singular-value curves of the main open-loop system and the proposed method, the weighting functions of robust H ∞ controller are selected. In the next step, by using the MQDM technique, the transfer function ofthe system in state-space form is evaluated to extract gain of the robust controller. For practicality of the conducted approach, singular-value order reduction Hankel algorithm along with frequency response analysis have been used for designing the gain of the robust controller. The developed method has been implemented on the MTDC converter in the wind farm side to control the voltage of DC grid. The simulations are accomplished in MATLAB, where by considering different uncertainties in the DC grid, wind unit, and the AC grid, robustness of the proposed approach has been clearly demonstrated.

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Robust Decoupled Outer-Control Design for Single VSC and HVDC Grid With Controller Weak AC System Interconnection

Cited by 10 publications

References 20 publications

Grid Equivalent Representation of Power Systems With Penetration of Power Electronics

Grid Equivalent Representation of Power Systems With Penetration of Power Electronics

Analysis and Dynamic Stabilization of a High-Voltage VSC-MTDC Grid With DC Power Flow Controller Connected to Extremely Weak AC Systems

Design of a new robust controller for voltage regulation of DC link in wind‐farm‐side converter integrated with a hybrid AC and DC large‐scale power system

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