Coordinated Flexible Damping Mechanism With Inertia Emulation Capability for MMC-MTDC Transmission Systems

Zhu, Jiebei; Shen, Zhipeng; Bu, Siqi; Li, Xialin; Booth, Campbell; Qiu, Wei; Jia, Hongjie; Wang, Chengshan

doi:10.1109/jestpe.2020.3025690

Cited by 24 publications

(20 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the DC voltage changes, the change in the active power will be the same in the capacitors of the MMC submodules. The short term is given as follows [24,25]:…”

Section: Mmc-hvdc Systemmentioning

confidence: 99%

See 1 more Smart Citation

Improved Control Strategy of MMC–HVDC to Improve Frequency Support of AC System

2020

View full text Add to dashboard Cite

With the continuous development of power electronics technology, variable-speed offshore wind turbines that penetrated the grid system caused the problem of inertia reduction. This study investigates the frequency stability of synchronous, offshore wind-farm integration through a modular-multilevel-converter high-voltage direct-current (MMC–HVDC) transmission system. When full-scale converter wind turbines (type 4) penetrate the AC grid, the AC system debilitates, and it becomes difficult to maintain the AC system frequency stability. In this paper, we present an improved inertial-response-control method to solve this problem. The mathematical model of the synchronous generator is based on the swing equation and is theoretically derived by establishing a MMC–HVDC. Based on the above model, the inertia constant is analyzed using a model that integrates the MMC–HVDC and offshore synchronous generator. With the new improved control method, a more sensitive and accurate inertia index can be obtained using the formula related to the effective short-circuit ratio of the AC system. Moreover, it is advantageous to provide a more accurate inertial control evaluation for AC systems under various conditions. Furthermore, the impact of the MMC–HVDC on system safety is assessed based on the capacitor time constant. This simulation was implemented using the PSCAD/EMTDC platform.

show abstract

“…As the DC voltage changes, the change in the active power will be the same in the capacitors of the MMC submodules. The short term is given as follows [24,25]:…”

Section: Mmc-hvdc Systemmentioning

confidence: 99%

“…As the capacitor of the submodules can store energy, the MMC-HVDC can supply reactive power to the system without additional reactive power compensators, and therefore Q C AC is 0. Thus, we can calculate V DC re f using ( 22) as follows [21,[23][24][25]:…”

Section: Improved Inertia Response Controlmentioning

confidence: 99%

Improved Control Strategy of MMC–HVDC to Improve Frequency Support of AC System

2020

View full text Add to dashboard Cite

show abstract

“…IDEC schemes in [9]- [19]) or from DC capacitors (e.g. coordinated inertia and damping emulation control (CIDE) schemes in [20]- [25]) .…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the INEC scheme does not mimic the SG damping characteristics which can effectively suppress angular oscillations as designed in [10]. Other CIDE schemes, as proposed in [22]- [25], use both the energy of the DC capacitors and the kinetic energy of wind turbines to provide the inertial response. However, the CIDE schemes in [20]- [25] are not designed to provide frequency support to OWF systems under offshore grid contingencies.…”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Shen

et al. 2023

IEEE Trans. Power Syst.

View full text Add to dashboard Cite

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.

show abstract

“…An active damping control method applied in Reference [24] to suppress DC side oscillations. Reference [25] proposes a coordinated flexible damping mechanism, which allows the MTDC system to autonomously provide emulated inertial response with flexible damping effect to AC systems without communication.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Control of Damping in VSC–MTDC System with DC Circuit Breakers

Gao

Zhou

et al. 2021

Symmetry

View full text Add to dashboard Cite

DC circuit breaker (DCCB) systems with a DC reactor in series are normally equipped in the voltage-sourced-converter-based multi-terminal DC (VSC–MTDC) systems for DC fault clearance. However, it is revealed that the use of DC reactors could undermine the system damping and deteriorate the system stability. In this paper, a controller based on hybrid sensitivity is proposed to improve the stability of power system and realize the power symmetry of multi-terminal systems. Firstly, based on a generalized MTDC small-signal model, an eigenvalue analysis is performed to provide deep insight into the stability issue imposed by DC reactors. Furthermore, a local controller based on hybrid sensitivity was proposed, and on this basis, a global controller was designed to solve asymmetrical power flow. Finally, a four-terminal VSC–MTDC model was built in Simulink to evaluate the performance of DC-PSS. Simulation results verify the effectiveness of the proposed controller in stabilizing MTDC systems and symmetrizing of power flow.

show abstract

Coordinated Flexible Damping Mechanism With Inertia Emulation Capability for MMC-MTDC Transmission Systems

Cited by 24 publications

References 24 publications

Improved Control Strategy of MMC–HVDC to Improve Frequency Support of AC System

Improved Control Strategy of MMC–HVDC to Improve Frequency Support of AC System

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

Investigation and Control of Damping in VSC–MTDC System with DC Circuit Breakers

Contact Info

Product

Resources

About