DC Fault Protection of Diode Rectifier Unit Based HVDC System Connecting Offshore Wind Farms

Li, Rui; Yu, Lujie; Xu, Lie; Adam, Grain Philip

doi:10.1109/pesgm.2018.8586510

Cited by 16 publications

(12 citation statements)

References 7 publications

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“…On the other hand, although Q-f droop control is used in [12][13][14][15][16] for WT reactive power sharing, the justification for its use and the design procedure of the Q-f droop gain kq have not been clarified and properly understood. Besides, the impedance between individual WT converter and the offshore PCC is predominately inductive, as the AC cable resistance and capacitance are much less than the combined inductances of WT converter line reactor and WT transformer leakage inductance.…”

Section: Analysis Of the Wt Q-f Controlmentioning

confidence: 99%

Analysis and Control of Offshore Wind Farms Connected With Diode Rectifier-Based HVDC System

et al. 2020

IEEE Trans. Power Delivery

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This paper analyzes the control and operation of offshore wind farms connected with diode rectifier based HVDC (DR-HVDC) system. A small-signal state-space model of the offshore wind turbines (WTs) connected with DR-HVDC system is developed to design the WT Q-f droop control. The use of WT P-V and Q-f control during individual WT active power variation is clearly clarified. In order to reduce the interaction between WT active power and reactive power, an angle feedforward control is proposed where an additional phase shift is directly added to the WT output voltage based on the WT's active power output. The effectiveness of the proposed control on improving dynamic response and reducing active and reactive power interaction is verified by frequency-domain analysis and time-domain simulations in PSCAD/EMTDC. Index Terms-diode rectifier based HVDC, interaction of WT active and reactive power, small-signal analysis, wind turbine control This work was supported by the European Union's Horizon 2020 research and innovation programme under Grant 691714.

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Section: Analysis Of the Wt Q-f Controlmentioning

confidence: 99%

Analysis and Control of Offshore Wind Farms Connected With Diode Rectifier-Based HVDC System

et al. 2020

IEEE Trans. Power Delivery

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“…Due to the use of Q‐f droop control, expressed as

ω_{wtref} = k_{q} ()(, Q_{wt} - Q_{ref}) + ω_{wt 0}

, in the WT primary control [12–14], the reactive power reference Q ref in the primary control is adjusted to regulate the offshore frequency as shown in Fig. 3, where k fp and k fi are the control parameters of the secondary frequency control,

ω_{pcc}

is the offshore PCC frequency and

ω_{ref}

is the desired offshore frequency equalling to the HVAC link frequency.…”

Section: Proposed Secondary Control and Tertiary Controlmentioning

confidence: 99%

“…The offline WTs can be easily synchronised to offshore AC network and WTs can provide offshore AC frequency control autonomously. The fault performances including offshore symmetrical and asymmetrical faults, DC fault, and diode-rectifier unit fault are analysed and relevant protection schemes are developed in [13,14].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical control of offshore wind farm connected by parallel diode‐rectifier‐based HVDC and HVAC links

2019

IET Renewable Power Generation

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This paper investigates the operation of offshore wind farm connected by parallel diode-rectifier based HVDC (DR-HVDC) and HVAC links. A secondary voltage control is proposed to control the offshore AC voltage amplitude by regulating the DC voltage of the DR-HVDC link. A secondary frequency control and a phase angle control are proposed to adjust the reactive power reference in the primary control, which synchronise the offshore point of common coupling (PCC) frequency and phase angle to those of the HVAC link. Such secondary voltage control, frequency control and phase angle control enable seamless transition from DR-HVDC mode to parallel mode. A tertiary power control scheme is further proposed to control the active power flow distribution between DR-HVDC and HVAC links through the regulation of PCC phase angle. To ensure smooth transition from HVAC mode to parallel mode, a virtual DC power control is proposed to control the virtual DC power at zero prior to the connection of the DR-HVDC link. A small-signal model of the parallel system is developed and the stability analysis is carried out for the proposed control scheme. Simulation results in PSCAD/EMTDC verify the proposed control under normal and fault conditions.

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“…Faults in hybrid LCC-VSC HVdc systems with Diode Rectifier-connected Wind Power Plants (DR-WPP) have been previously studied [4], [19], [20], [21]. However, [4] considered mainly the efficiency studies, with only marginal fault studies in monopolar point-to-point systems.…”

Section: Introductionmentioning

confidence: 99%

Protection Strategies for the Connection of Diode Rectifier-Based Wind Power Plants to HVdc Interconnectors

Martínez-Turégano

Vidal-Albalate

Añó-Villalba

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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The connection of diode rectifier (DR) based wind power plants to existing or planned High Voltage dc (HVdc) interconnectors can lead to important savings on cost and system robustness. Since the DR station usually operates in a bipolar configuration, its connection to symmetric monopoles is particularly challenging. However, there are no published detailed studies on the protection of DR connection wind power plants to symmetric monopole interconnectors or even to bipolar interconnectors. This paper includes the comparative study of five different protection strategies for such systems, including both solid and resistive DR station grounding and strategies with and without the use of dc-circuit breakers. An analytical study allows for the calculation of fault current during fault on-set for both half-bridge and hybrid Modular Multi-level Converter (MMC) stations. Using detailed Electromagnetic Transient (EMT) simulation studies, the different protection strategies are evaluated in terms of current, voltage and isolation requirements of each element, as well as the need for dc-circuit breakers, fast communication or larger surge arresters. Moreover, a distance fault detection algorithm is included for the wind turbine converters to distinguish between local ac-grid and dc-cable faults.From the simulation results it is possible to conclude that DR high impedance grounding, together with wind turbine distance protection can be used for the protection of DR based offshore wind power plants connected to symmetric monopole interconnectors without requiring dc-circuit breakers.

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DC Fault Protection of Diode Rectifier Unit Based HVDC System Connecting Offshore Wind Farms

Cited by 16 publications

References 7 publications

Analysis and Control of Offshore Wind Farms Connected With Diode Rectifier-Based HVDC System

Analysis and Control of Offshore Wind Farms Connected With Diode Rectifier-Based HVDC System

Hierarchical control of offshore wind farm connected by parallel diode‐rectifier‐based HVDC and HVAC links

Protection Strategies for the Connection of Diode Rectifier-Based Wind Power Plants to HVdc Interconnectors

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