Bilateral Inertia and Damping Emulation Control Scheme of VSC-HVDC Transmission Systems for Asynchronous Grid Interconnections

Abstract

This paper proposes a novel bilateral inertia and damping emulation (BIDE) control scheme for VSC-HVDC transmission systems that can autonomously provide inertial and damping responses to two VSC-HVDC interconnected asynchronous AC grids in a similar fashion of synchronous generators. For each VSC station, the energy for inertia emulation comes from augmented DC link capacitance whereas the energy for damping emulation comes from the interconnected grid on the other side. This proposed approach is communication-free as the essential information of two grid frequencies for inertia and damping emulation can be obtained from the locally measured variables dictated by the BIDE control algorithms. Modal analysis is carried out to investigate the impacts of BIDE-emulated inertia time constants and damping factors on system small-signal stability, and to obtain the optimal control parameters. The effectiveness of the proposed BIDE scheme is verified through controller hardwarein-the-loop experiments, in the presence of load changes and grid faults. The results show that the BIDE scheme can effectively enhance the stability and damp the frequency oscillations for both AC grids.

Supercapacitor‐based coordinated synthetic inertia scheme for voltage source converter‐based HVDC integrated offshore wind farm

“…The system SSM is established based on the state‐space modular subsystems of the circuits and control systems which are connected as in Figure 5, with the matrix equations presented in Appendix . The linearised form of the SSM, obtained with the aid of the linear analysis tool in MATLAB/Simulink [32], can be expressed as follows: $$$\frac{d}{dt}{\Delta }\mathbf{X}=\mathbf{A}{\Delta }\mathbf{X}+\mathbf{B}{\Delta }\mathbf{U}$$$ where Δ represents small perturbation changes, A is the state matrix, B is the input/control matrix, X is the state vector and U is the input vector.…”

“…The system SSM is established based on the state-space modular subsystems of the circuits and control systems which are connected as in Figure 5, with the matrix equations presented in Appendix B. The linearised form of the SSM, obtained with the aid of the linear analysis tool in MATLAB/ Simulink [32], can be expressed as follows:…”

Frequency support scheme of grid‐forming based hybrid cascaded HVDC integrated wind farms

“…This method is employed in the MMC‐HVDC system in [14], but it propagates the frequency fluctuations to the remote grid. To provide frequency support to both of two HVDC interconnected grids, an inertia and damping emulation control is introduced in MMC‐HVDC that can mimic characteristics of synchronous generators (SG) [15]. In [16], a primary frequency control scheme suitable for HC‐HVDC has been designed, which combines droop control with inertia emulation control.…”

Analysis of Asymmetric Fault Commutation Failure in HVDC System Considering Instantaneous Variation of DC Current

“…China implemented a grid structure using a "west-east power transmission national network". LCC-HVDC holds a vital position and assumes critical significance in governing the current situation of power generation and inverse power load distribution in east and west China [1,2]. High-voltage DC transmission systems offer several advantages (e.g., low line costs, fast control response and power regulation, and minimal transmission losses) [3].…”