Rationalisation and validation of dc power transfer limits for voltage sourced converter based high voltage DC transmission

Zhou, Jenny Zheng; Gole, Aniruddha M.

doi:10.1049/iet-gtd.2015.0801

Cited by 19 publications

(7 citation statements)

References 12 publications

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“…In practice, the unity power factor is normally required for the VSC-HVDC operation in order to make full use of the converter capacity. For weak AC grid integration, VSCs may be required to output reactive power to support the AC voltage [24] [25]. The relationship between u s , u p , P ac and Q can be obtained as [25]:…”

Section: A Impact Of the Reactive Powermentioning

confidence: 99%

Comparative Study of Small-Signal Stability Under Weak AC System Integration for Different VSCs

Xiang

Lin

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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Voltage source converters (VSCs) with self-commutation ability are suitable to interconnect weak AC systems. This paper conducts a comparative study of the small-signal stability characteristics for three typical VSCs, namely, the two-level VSCs (TL-VSCs), the half-bridge modular multilevel converters (HB-MMCs) and the hybrid MMCs (HY-MMCs), under weak AC system integration with special consideration on both inverter and rectifier operation. The frequency responses based on impedance models are compared using the frequency-domain analysis. The oscillation frequencies and mainly participated state variables of the unstable modes are compared using root locus and participation factor analysis in time-domain. Proper parameter retuning approaches for stability enhancement are proposed. The above analysis is adequately validated by electromagnetic simulations.

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Section: A Impact Of the Reactive Powermentioning

confidence: 99%

Comparative Study of Small-Signal Stability Under Weak AC System Integration for Different VSCs

Xiang

Lin

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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“…Developing an HVDC grid is a very complex and challenging task nonetheless, numerous aspects must be considered such as control methods [45][46][47], protection and coordination [48][49][50][51][52], power ratings [53], and cost and effectiveness [54][55][56], before a decision can be which system design better suits the job.…”

Section: Grid-side Current Feeding Stagementioning

confidence: 99%

HVDC transmission for access to off‐shore renewable energy: a review of technology and fault detection techniques

Mitra

Chowdhury

Manjrekar

2018

IET Renewable Power Generation

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The ever-increasing demand for electric power has partially been met with access to offshore renewable energy, such as wind and tidal energy. With the development in power electronics, high-voltage direct current (HVDC) transmission is taking over as the primary choice for connecting offshore generation to onshore grids. Voltage source converter (VSC)-based HVDC is set to become the backbone of the multi-terminal DC grids replacing the conventional line commutated converter networks. VSC-HVDC networks offer the flexibility for HVDC grids to be connected as conventional AC grids in a meshed network. Advancement of technology has led to the development of the modular multilevel converter which has higher efficiency compared to the two-level VSC configurations. They are gradually becoming a popular choice. Although VSC-based grids offer a varied range of advantages, it is highly vulnerable to DC faults. Many designs of breakers have been patented over the years and various means have been proposed for their control. This study aims to review the available designs of HVDC terminals, the available protection devices and the protection and control methods for HVDC breakers. By comparing the state-of-the-art technologies that are currently available, this study aims to address the research issues and the additional research and development work that needs to be done.

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“…Such assumption has been proved invalid for weak grid conditions due to two amplified issues, i.e. small-signal damping [11][12][13][14] and the constraint of power flow [15] [16].…”

Section: Introductionmentioning

confidence: 99%

“…Known as "var/volt" droop, reactive power/voltage droop can provide automatic voltage support [22]; nevertheless, its coupling effect with electromagnetic damping has been overlooked and therefore not adequately investigated. Further, for most studies reported, stability analysis is based on a presumed equilibrium point [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], but how it is reached has not been explicitly explained.…”

Section: Introductionmentioning

confidence: 99%

A Less-Intrusive Approach to Stabilize VSC Transmission Against Highly Variable Grid Strength

Zhang

Dong

Givaki

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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A less-intrusive solution to stabilize a Voltage Source Converter (VSC) over an unknown grid strength is presented in this paper. The existence of equilibrium point is investigated as a prerequisite to stabilization. By partially imposing grid forming control, a simple auxiliary outer loop is proposed to exhaust the physical limit of power delivery in steady state and provide support to fault-ride-through operations over a wide range of grid strength. The proposed control can be used to upgrade a commissioned VSC with inner current loop intact; it also offers a non-intrusive solution to stabilize VSCs externally. The effectiveness of the proposed schemes are verified by analysis in frequency domain and simulations in Electromagnetic Transient (EMT) time domain considering change of grid strength and fault-ride-through.

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Rationalisation and validation of dc power transfer limits for voltage sourced converter based high voltage DC transmission

Cited by 19 publications

References 12 publications

Comparative Study of Small-Signal Stability Under Weak AC System Integration for Different VSCs

Comparative Study of Small-Signal Stability Under Weak AC System Integration for Different VSCs

HVDC transmission for access to off‐shore renewable energy: a review of technology and fault detection techniques

A Less-Intrusive Approach to Stabilize VSC Transmission Against Highly Variable Grid Strength

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