Unified adaptive droop control design based on dynamic reactive power limiter in VSC-MTDC

Liu, Baohong; Liu, Tianqi; Zhang, Yingmin

doi:10.1016/j.epsr.2017.03.010

Cited by 26 publications

(28 citation statements)

References 16 publications

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“…Note that both L and A are constant. According to (14), the two-norm (also called Euclidean norm) of L − AT should be minimum to make the voltage deviation ΔU dc of the DC system as small as possible, i.e. min∥ L − AT ∥ 2 (15) Since there is no definite functional relation among the components of the vector T, the solution of T can be estimated by applying the unconstrained least squares method…”

Section: Calculation Methodology For Droop Coefficientsmentioning

confidence: 99%

“…How to determine the droop coefficients is the key issue in implementing the droop control. The design of droop control in the existing literature can be divided into two categories, namely droop control with variable droop coefficients [13,14] and fixed droop coefficients [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Droop control with variable droop coefficients is adopted in [13,14], in which droop coefficients of the converter stations with droop control (hereafter called droop control stations) are adjusted in real time according to operating condition. In [13], the droop coefficients are adjusted in a predefined manner, inversely proportional to the corresponding power margins (the difference between rated capacity and actual load).…”

Section: Introductionmentioning

confidence: 99%

“…Due to the real-time change of power margins during the power allocation caused by converter outage or power step disturbance, the droop coefficients are calculated all the time. A similar idea to calculate droop coefficients is presented in [14], and the regulation law of droop coefficients corresponding to the changing power margin is different from [13].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Methodology of calculating droop coefficients for stabilising DC voltage in VSC‐MTDC system against disturbances

Zhang

2019

IET Generation, Transmission & Distribution

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Section: Calculation Methodology For Droop Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Methodology of calculating droop coefficients for stabilising DC voltage in VSC‐MTDC system against disturbances

Zhang

2019

IET Generation, Transmission & Distribution

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“…It is worth underscoring that for the MMC type VSC-HVDC links, more controllers for managing internal dynamics will be required, but such aspects are beyond the scope of this paper. Master-slave, DC voltage margins and many types of linear and nonlinear droop controls are just a few examples of methods proposed for ensuring satisfactory operation of multiterminal HVDC networks during normal and abnormal conditions[161][162][163].LCC and VSC based HVDC transmission require different protection systems that vary between point-to-point and multi-terminal HVDC links. For instance, the inherent LCC characteristic of unidirectional DC current with highly inductive DC link greatly restrains the rate-of-rise of DC fault current.…”

mentioning

confidence: 99%

HVDC Transmission: Technology Review, Market Trends and Future Outlook

Alassi

Bañales

Ellabban

et al. 2019

Renewable and Sustainable Energy Reviews

259

104

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HVDC systems are playing an increasingly significant role in energy transmission due to their technical and economic superiority over HVAC systems for long distance transmission. HVDC is preferable beyond 300-800 km for overhead point-to-point transmission projects and for the cable based interconnection or the grid integration of remote offshore wind farms beyond 50-100 km. Several HVDC review papers exist in literature but often focus on specific geographic locations or system components. In contrast, this paper presents a detailed, up-to-date, analysis and assessment of HVDC transmission systems on a global scale, targeting expert and general audience alike. The paper covers the following aspects: technical and economic comparison of HVAC and HVDC systems; investigation of international HVDC market size, conditions, geographic sparsity of the technology adoption, as well as the main suppliers landscape; and high-level comparisons and analysis of HVDC system components such as Voltage Source Converters (VSCs) and Line Commutated Converters (LCCs), etc. The presented analysis are supported by practical case studies from existing projects in an effort to reveal the complex technical and economic considerations, factors and rationale involved in the evaluation and selection of transmission system technology for a given project. The contemporary operational challenges such as the ownership of Multi-Terminal DC (MTDC) networks are also discussed. Subsequently, the required development factors, both technically and regulatory, for proper MTDC networks operation are highlighted, including a future outlook of different HVDC system components. Collectively, the role of HVDC transmission in achieving national renewable energy targets in light of the Paris agreement commitments is highlighted with relevant examples of potential HVDC corridors.

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Coordinated DC voltage control strategy of hybrid HVDC with multi‐infeed MMC inverters considering commutation failures

Zhao

Zeng

Jiang

et al. 2021

Int Trans Electr Energ Syst

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Summary This paper investigates the hybrid HVDC with cascaded multi‐infeed MMCs' basic control characteristic and designs the coordinates control strategy considering the DC voltage control and commutation failures of the LCC inverters. The complete basic UI curves of the hybrid HVDC are obtained, and the interaction mechanism of each converter is also clarified, which is in master‐slave control mode. Through the obtained basic characteristic, to reduce the commutation failures of the LCC inverter, the coordinated DC voltage control strategy with dynamic limiter is designed to enhance the AC voltage stability. And the coordinated DC voltage control method coped with the dynamic limiters is also designed. Based on the proposed method, the DC voltage can be stable and unbalanced active power can also be distributed reasonably by the DC voltage control strategy, while much more reactive power can simultaneously be released from VSC to support the stable operation of the LCC inverter. Such that the DC side operation and AC side voltage stability of the hybrid HVDC can both be improved. Finally, the simulations verify the theoretical analysis done in the paper.

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Unified adaptive droop control design based on dynamic reactive power limiter in VSC-MTDC

Cited by 26 publications

References 16 publications

Methodology of calculating droop coefficients for stabilising DC voltage in VSC‐MTDC system against disturbances

Methodology of calculating droop coefficients for stabilising DC voltage in VSC‐MTDC system against disturbances

HVDC Transmission: Technology Review, Market Trends and Future Outlook

Coordinated DC voltage control strategy of hybrid HVDC with multi‐infeed MMC inverters considering commutation failures

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