Optimal Secondary Control to Suppress Voltage Fluctuations in an HVDC-Linked Wind Farm Grid

Jeong, Byeongcheol; Kwon, Dohoon; Park, Jae-Young; Kim, Young‐Jin; Gomis‐Bellmunt, Oriol

doi:10.1109/tpwrs.2021.3123790

Cited by 10 publications

(4 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the proposed strategy implies negligible impacts on the WT's drivetrain shaft. Future work needs to investigate the cooperation of this strategy with the offshore AC grid voltage controller [40].…”

Section: Discussionmentioning

confidence: 99%

Coordinated Power Oscillation Damping From a VSC-HVDC Grid Integrated With Offshore Wind Farms: Using Capacitors Energy

Zhang

Zhao

2023

IEEE Trans. Sustain. Energy

View full text Add to dashboard Cite

This paper proposes a novel coordinated control strategy for a voltage source converter (VSC) based high-voltage direct current (HVDC) grid integrated offshore wind farms (OWFs) to damp the power system oscillations. A feature of this strategy is aiming to use the DC-link capacitor energy of offshore wind turbines (WTs) to reduce interactions between power oscillations and HVDC grid voltage when onshore grid-side VSCs (GSVSCs) modulate the active and reactive power injections. Unlike the previous communication-based method, the coordination from offshore WTs in this strategy depends on the local measurements of the HVDC grid voltage instead of the remote communication data from the onshore AC grid. A modified IEEE 39-bus power system with a 5-terminal VSC-HVDC grid connected to two OWFs has been developed to validate the effectiveness of this proposed strategy. Both the eigenvalue analysis and time-domain simulation results indicate that this strategy can significantly improve the power oscillation damping (POD). Comparative simulation studies also conclude that the proposed strategy has similar POD improvements to the previous communication-based method without the negative impact of communication delay from onshore to offshore.

show abstract

Section: Discussionmentioning

confidence: 99%

Coordinated Power Oscillation Damping From a VSC-HVDC Grid Integrated With Offshore Wind Farms: Using Capacitors Energy

Zhang

Zhao

2023

IEEE Trans. Sustain. Energy

View full text Add to dashboard Cite

show abstract

“…In [58], MPC-based coordination was achieved in a distributed manner. Moreover, Figure 2b shows an optimal real-time strategy for secondary voltage control (SVC) of HVDC-linked OWFs, with consideration of the communication time delays between the central and local controllers [59]. The optimal coordination between the HVDC system and OWFs reduced voltage fluctuations at the PCC, POC, and the terminals of OWFs in the offshore grid.…”

Section: Frequency Stabilitymentioning

confidence: 99%

Research Needs for Realization of Zero-Carbon Power Grids with Selected Case Studies

et al. 2022

Self Cite

View full text Add to dashboard Cite

The attainment of carbon neutrality requires a research agenda that addresses the technical and economic challenges that will be encountered as we progress toward 100% renewable electricity generation. Increasing proportions of variable renewable energy (VRE) sources (such as wind turbines and photovoltaic systems) render the supply-and-demand balance of VRE-dominated power grids difficult. The operational characteristics and effects of VRE inverters also require attention. Here, we examine the implications of the paradigm shift to carbon neutrality and summarize the associated research challenges in terms of system planning, operation, and stability, and the need for energy storage integration, demand-side participation, distributed control and estimation, and energy sector coupling. We also highlight the existing literature gaps, and our recent studies that can fill in the gaps, thereby facilitating the improvement of grid operation and estimation. The numerical results of comparative case studies are also provided on the operational stability and economics of power grids with a high level of VRE sources, assisting stakeholders in establishing specific roadmaps and making relevant decisions.

show abstract

“…In Case 3, a centralized optimization problem was formulated to determine the decentralized control gains. Specifically, the centralized H∞ control gains were first obtained from the solution to the optimization problem and, consequently, the decentralized controller for grid k was implemented by arbitrarily setting the off-diagonal elements of the centralized gains to zero, apart from the elements corresponding to YEk and YPj for j ≠ k, shown in (15). This leads the decentralized control for Case 3 to become non-optimal.…”

Section: A Test System and Simulation Conditionsmentioning

confidence: 99%

“…Moreover, in general, MPC is computationally intensive, because an optimization problem for MPC needs to be solved directly at every time step. MPC is also likely to cause oscillatory and even unstable operation of MTDC-linked grids due to communication time delays and model parameter uncertainty [15]. Therefore, the optimal FR strategies discussed in [12]- [14] need to be further analyzed under practical conditions of MTDC systems, for example, with regard to hybrid converters, communications links, and system parameter estimates.…”

Section: Introductionmentioning

confidence: 99%

Decentralized Robust Frequency Regulation of Multi-terminal HVDC-linked Grids

Kim

Park

Kim

et al. 2022

IEEE Trans. Power Syst.

Self Cite

View full text Add to dashboard Cite

This paper proposes a new strategy for optimal grid frequency regulation (FR) in an interconnected power system where regional ac grids and an offshore wind farm are linked via a multi-terminal high voltage direct-current (MTDC) network. In the proposed strategy, decentralized H∞ controllers are developed to coordinate the operations of synchronous generators and MTDC converters, thus achieving optimal power sharing of interconnected ac grids and minimizing frequency deviations in each grid. To develop the controllers, robust optimization problems are formulated and solved using a dynamic model of the hybrid MTDC-linked grids with model parameter uncertainty and decentralized control inputs and outputs. The model orders of the controllers are then reduced using a balanced truncation algorithm to eliminate unobservable and uncontrollable state variables while preserving their dominant response characteristics. Sensitivity and eigenvalue analyses are conducted focusing on the effects of grid measurements, parameter uncertainty levels, and communication time delays. Comparative case studies are also carried out to verify that the proposed strategy improves the effectiveness, stability, and robustness of real-time FR in MTDC-linked grids under various conditions.

show abstract

Optimal Secondary Control to Suppress Voltage Fluctuations in an HVDC-Linked Wind Farm Grid

Cited by 10 publications

References 32 publications

Coordinated Power Oscillation Damping From a VSC-HVDC Grid Integrated With Offshore Wind Farms: Using Capacitors Energy

Coordinated Power Oscillation Damping From a VSC-HVDC Grid Integrated With Offshore Wind Farms: Using Capacitors Energy

Research Needs for Realization of Zero-Carbon Power Grids with Selected Case Studies

Decentralized Robust Frequency Regulation of Multi-terminal HVDC-linked Grids

Contact Info

Product

Resources

About