Renewable energy transmission by HVDC across the continent: system challenges and opportunities

Sun, Jian; Li, Mingjie; Zhang, Zhigang; Xu, Tao; He, Jun; Wang, Haijiao; Li, Guanghui

doi:10.17775/cseejpes.2017.01200

Cited by 265 publications

(144 citation statements)

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“…The remaining values of ε are 0.01, 0.19, and 0.5, respectively. According to (7), the results of the entropy weights can be calculated, which are shown in Table II.…”

Section: Objective Weighting Methodsmentioning

confidence: 99%

“…The greater the weight, the greater the influence on the final evaluation result. In this paper, we obtain subjective weights by FAHP (1)and (2) and objective weights by the entropy weight method (3)- (7).…”

Section: Fuzzy Comprehensive Assessment As Shown Inmentioning

confidence: 99%

“…The entropy of each indicator is calculated according to (5). The weight calculation is done according to (7) to get objective weights w 2 . According to (8), we need to decide the limit C of each indicator, and l is the limit vector.…”

Section: Weights Of Indicatormentioning

confidence: 99%

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Synthetic evaluation of DC power quality based on combination weighting

Qingxian³

et al. 2020

IEEJ Transactions Elec Engng

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With the development of global renewable energy, DC transmission and DC power distribution technology have been applied on a large scale, and the requirements for DC power quality (PQ) are more stringent. Evaluating DC PQ reasonably and effectively has become a research hotspot at this stage. In this paper, a comprehensive analysis for various indexes of DC PQ is conducted to obtain a unified parameter for describing the characteristics of PQ from an overall perspective. First, weight values of PQ indexes are calculated by combining fuzzy analytic hierarchy process (FAHP) and the improved entropy weight method. FAHP can satisfy the consistency without the consistency test, and the improved entropy weight method is an objective weighting method that can effectively avoid the preference of subjective weighting method. Then, based on a triangular fuzzy function, the membership degree is obtained. Finally, a fuzzy comprehensive evaluation is made. An example analysis is carried out with the data provided by the Gree photovoltaic direct‐driven inverter multi‐variable refrigerant flow system to show the validity of the proposed method for evaluating DC PQ. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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“…The remaining values of ε are 0.01, 0.19, and 0.5, respectively. According to (7), the results of the entropy weights can be calculated, which are shown in Table II.…”

Section: Objective Weighting Methodsmentioning

confidence: 99%

Section: Fuzzy Comprehensive Assessment As Shown Inmentioning

confidence: 99%

See 1 more Smart Citation

Synthetic evaluation of DC power quality based on combination weighting

Qingxian³

et al. 2020

IEEJ Transactions Elec Engng

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“…The authors declare no conflict of interest. Nomenclature E 1 , E 2 Equivalent internal potential of the sending and receiving ends δ 1 , δ 2 Equivalent rotor angle of sending and receiving ends U 1 , U 2 Bus voltage of sending and receiving ends θ 1 , θ 2 Phrase angle of sending and receiving ends x 1 , x 2 Equivalent transmission line reactance values x 12 AC tie-line reactance interconnecting the sending and receiving ends P G1 , P G2 Equivalent generator mechanical power values P L1 , P L2 Equivalent load power of sending and receiving ends P 12 Equivalent AC tie-line power interconnecting sending and receiving end P DC Equivalent DC transmission power M 1 , M 2 Equivalent generator inertia of sending and receiving ends K s Synchronous torque coefficient of the AC tie-line D Damping coefficient δ 12 Equivalent rotor angle difference between the sending and receiving end δ 120 Equivalent rotor angle of the AC tie-line equilibrium point ω n Natural oscillation frequency ξ…”

Section: Conflicts Of Interestmentioning

confidence: 99%

“…The majority of these lines are rated at ±800 kV, except two that are at ±500 kV and one (from Changji, Xinjiang to Xuancheng, Anhui, under development) at ±1100 kV. Almost all lines that are currently in operation were developed after 2010 [2]. If an LCC-HVDC system with a large capacity fails, it would have a large impact on the sending and receiving terminals and could even affect the stability of the power grid, thus resulting in cascading failures [3].…”

Section: Introductionmentioning

confidence: 99%

AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures

Sun

Liu

2020

Energies

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With the rapid development of ultra-high-voltage (UHV) AC/DC, especially the step-by-step upgrading of the UHV DC transmission scale, security presents new challenges. Commutation failure (CF) is a common fault in line commutated converter (LCC) high-voltage direct current (HVDC) power systems. Once failure happens, it may cause power oscillations in a system. In this paper, taking a two-area AC/DC parallel interconnected power system as the example, based on the impulse response model of second-order linear system, the mechanism of power oscillation on the AC tie-line caused by CF are clarified. It is proved that the peak value of the AC tie-line power oscillation is mainly determined by the DC power and the equivalent CF duration, the frequency and damping ratio of dominant area oscillation mode. Meanwhile, the peak time is mainly determined by the oscillation frequency. Finally, the correctness and effectiveness of the algorithms are verified by a simulation analysis of an extended IEEE-39-bus AC/DC parallel interconnected power system. These research results can provide a basis for the arrangement of the operating modes and the formulation of control measures for interconnected power grids.

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Control of VSC‐HVDC connected wind farms for system frequency support

Guo

Yan

et al. 2020

Int Trans Electr Energ Syst

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Summary With the increasing offshore wind farms connected into large power grid by VSC‐HVDC, the system equivalent inertia has been further reduced, which has brought new challenges to the safe operation of the system. In this article, we proposed a novel strategy to coordinate the rotational kinetic energy of variable speed wind turbines and the capacitor energy of VSC‐HVDC to support the main power system frequency. Selection of controller parameters is discussed to improve the frequency control effect. This strategy reduces the rate of change of frequency and improves the frequency nadir, which also limit the wind turbine rotor speed variation range to maintain its stable operation. The proposed strategy can also reduce the secondary frequency drop to a large extent. The proposed strategy is verified by using a power system model in MATLAB/Simulink. The simulation results show that the proposed method can effectively utilize the frequency control capability of VSC‐HVDC and the wind farm to maintain frequency stability of the power system.

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Renewable energy transmission by HVDC across the continent: system challenges and opportunities

Cited by 265 publications

References 0 publications

Synthetic evaluation of DC power quality based on combination weighting

Synthetic evaluation of DC power quality based on combination weighting

AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures

Control of VSC‐HVDC connected wind farms for system frequency support

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