A New Definition of Short-circuit Ratio for Multi-converter HVDC Systems

Liu, Dengfeng; Shi, Dongyuan; Li, Yinhong

doi:10.5370/jeet.2015.10.5.1958

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…Details of different types of MIESCR are explained in References [14][15][16][17]. Researchers tried to improve the MIIF, because the index was made for the evaluation of the interaction between two inverters.…”

Section: Multi-infeed Effective Short Circuit Ratiomentioning

confidence: 99%

HVDC-System-Interaction Assessment through Line-Flow Change-Distribution Factor and Transient-Stability Analysis at Planning Stage

2016

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Many of the recent projects for new transmission line have considered the high-voltage direct current (HVDC) system, owing to the many advantages of the direct current (DC) system. The most noteworthy advantage is that a cable can serve as a substitute for the overhead transmission line in residential areas; therefore, the HVDC system application is increasing, and as the number of DC systems in the power system increases, the interaction assessment regarding the HVDC system gains importance. An index named multi-infeed interaction factor (MIIF) is commonly used to estimate the interaction between power converters; however, the HVDC system is composed of two converters and a transmission line. The MIIF represents the interaction between the rectifiers and inverters, but not for the whole system. In this work, a method to assess the interaction of the whole system was therefore studied. To decide on the location of the new HVDC transmission system at the planning stage, in consideration of the interaction of the existing DC system, the line flow change distribution factor, according to the HVDC-transmission capacity change, was examined. Also, a power system transient -stability analysis was performed with different HVDC system locations, depending on the distribution factor. The simulation results indicate that when the factor is higher, two HVDC systems have a stronger interaction and are less stable in the transient state.

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Section: Multi-infeed Effective Short Circuit Ratiomentioning

confidence: 99%

HVDC-System-Interaction Assessment through Line-Flow Change-Distribution Factor and Transient-Stability Analysis at Planning Stage

2016

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“…The MIIF calculation method of the HMIDC considering DC control response characteristics is proposed [21]. Few studies focus on the MIIF of the HMIDC, though it is valuable for evaluating the voltage and power stability, the risk of LCC-HVDC commutation failure, and the interaction of harmonics [22][23][24]. In projects, VSC-HVDC can be equipped with voltage regulation control to enhance voltage stability, which affects the voltage interaction between the inverters.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Multi-Infeed Interaction Factor Calculation Method Considering Voltage Regulation Control Characteristics of Voltage Source Converter

Liu,

Chi,

Han

et al. 2024

ENERGY

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Voltage source converter based high voltage direct current (VSC-HVDC) can participate in voltage regulation by flexible control to help maintain the voltage stability of the power grid. In order to quantitatively evaluate its influence on the voltage interaction between VSC-HVDC and line commutated converter based high voltage direct current (LCC-HVDC), this paper proposes a hybrid multi-infeed interaction factor (HMIIF) calculation method considering the voltage regulation control characteristics of VSC-HVDC. Firstly, for a hybrid multi-infeed high voltage direct current system, an additional equivalent operating admittance matrix is constructed to characterize HVDC equipment characteristics under small disturbance. Secondly, based on the characteristic curve between the reactive power and the voltage of a certain VSC-HVDC project, the additional equivalent operating admittance of VSC-HVDC is derived. The additional equivalent operating admittance matrix calculation method is proposed. Thirdly, the equivalent bus impedance matrix is obtained by modifying the alternating current (AC) system admittance matrix with the additional equivalent operating admittance matrix. On this basis, the HMIIF calculation method based on the equivalent bus impedance ratio is proposed. Finally, the effectiveness of the proposed method is verified in a hybrid dual-infeed high voltage direct current system constructed in Power Systems Computer Aided Design (PSCAD), and the influence of voltage regulation control on HMIIF is analyzed. KEYWORDSHybrid multi-infeed high voltage direct current system; hybrid multi-infeed interaction factor; control modes; equivalent node impedance ratio; voltage interaction characteristics

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“…The values of sensitivities under different control modes can be obtained by the mathematical expressions given in [11,12]. dQ cm /dU m is the sensitivity of reactive power generated by the shunt reactive power compensator at the converter bus k with respect to converter bus voltage.…”

Section: Analytical Derivationmentioning

confidence: 99%

“…The analysis results of reference [11] show that the interaction level is related to network parameters and operation states of AC system, and power-voltage characteristics of a converter which depend on the control modes employed by a HVDC link. Reference [12] analyzes the influence mechanism of control modes with respect to voltage interaction and suggest that power-voltage sensitivity of the inverter is one of the main influencing factors.…”

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confidence: 99%

Analytical Calculation for Multi-Infeed Interaction Factors Considering Control Modes of High Voltage Direct Current Links

Xia

Wang

et al. 2018

Energies

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Abstract:The multi-infeed interaction factor (MIIF) is used extensively in indicating the degree of interaction among high-voltage direct current (HVDC) converters and is currently calculated by simulation methods according to the definition, or by using the equivalent impedance ratio method. The first method is an experimental calculation method and the second method does not account for the effects of HVDC control modes. An analytical calculation method for MIIF considering control modes of HVDC links is proposed in this paper. First, the voltage variation of converter bus in the context of small disturbance is equated by using the bus impedance matrix. In this way the equations for the solution of MIIF considering HVDC control mode are obtained. Subsequently, based on two rational assumptions, the practical analytical calculation expression of MIIF is deduced in detail. The MIIF calculation method proposed in this paper is an improvement of the equivalent impedance ratio method and reflects the main influencing factors of voltage interaction including HVDC control modes. Moreover, the derived analytical expression can give a fundamental insight into parameter dependencies of voltage interaction. Finally, the validity and accuracy of the proposed approach are demonstrated in both dual-infeed HVDC system and actual large-scale power grid.

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A New Definition of Short-circuit Ratio for Multi-converter HVDC Systems

Cited by 5 publications

References 6 publications

HVDC-System-Interaction Assessment through Line-Flow Change-Distribution Factor and Transient-Stability Analysis at Planning Stage

HVDC-System-Interaction Assessment through Line-Flow Change-Distribution Factor and Transient-Stability Analysis at Planning Stage

Hybrid Multi-Infeed Interaction Factor Calculation Method Considering Voltage Regulation Control Characteristics of Voltage Source Converter

Analytical Calculation for Multi-Infeed Interaction Factors Considering Control Modes of High Voltage Direct Current Links

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