Large-Signal Stability Analysis for VSC-HVDC Systems Based on Mixed Potential Theory

Zheng, Huajun; Zhou, Luowei; Sun, Pengju; Lu, Weiguo

doi:10.1109/tpwrd.2019.2957270

Cited by 24 publications

(7 citation statements)

References 30 publications

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“…14. 3.2) Negative feedback system: Meanwhile, according to (15), the decrease of idg results in an increase of ids1, and then the decrease of udi1 under the impact of the d-axis voltage inner-loop PI controller of the REC. Following (16), it is known that uds1 will decrease, and then from ( 14), uDC will increase, which mitigates the adverse impact of the positive feedback system as discussed previously.…”

Section: ) Linearized Relationship Among the Relevant State Variablesmentioning

confidence: 99%

Sub-Synchronous Oscillation Characteristics and Analysis of Direct-Drive Wind Farms With VSC-HVDC Systems

Shao

Zhao

Yang

et al. 2021

IEEE Trans. Sustain. Energy

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Field experiences have shown that sub-synchronous oscillations (SSOs) can occur in direct-drive wind farms with VSC-HVDC (DDWFV) systems. In light of this, a dynamic mathematical model of the DDWFV is established in this paper.The SSO characteristics are analyzed through the eigenvalue method. Considering the participation factor, the analysis reveals that the SSO is mainly affected by the grid-side converter controller of the wind turbine units, the rectifier controller of the VSC-HVDC and certain system parameters. The impact of system parameters on the damping performance and frequency characteristics of the SSO is further explored. By separating the VSC-HVDC into three parts, the impact of the control characteristics and the AC-side elements characteristics of the VSC-HVDC on the SSO is discussed. New insights into the SSO issue are also offered by analyzing the interaction among various state variables. The theoretical analysis is verified by extensive time-domain simulations.

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Section: ) Linearized Relationship Among the Relevant State Variablesmentioning

confidence: 99%

Sub-Synchronous Oscillation Characteristics and Analysis of Direct-Drive Wind Farms With VSC-HVDC Systems

Shao

Zhao

Yang

et al. 2021

IEEE Trans. Sustain. Energy

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“…Ref. [20] analyses system parameters influence on the large signal stability of DC microgrids, and determines the system stability boundary, based on mixed potential function. In ref.…”

Section: Introductionmentioning

confidence: 99%

Large signal stability criterion of AC–DC hybrid microgrids with constant power loads considering reference current limitation

Liu

Song

et al. 2022

IET Generation Trans & Dist

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Islanded AC-DC hybrid microgrids composed of new energy sources, constant power loads and energy storage system are typical non-linear systems, and guaranteeing large signal stability is a key issue. In this paper, the non-linear model of islanded AC-DC hybrid microgrids is established, and large signal stability criteria are obtained. Considering reference current limitation of the energy DC-AC converter, the derived large signal stability criterion gives important constraints on the constant power loads power, the power of energy storage unit, DC bus voltage, the inductor and equivalent resistance of the AC filter, DC capacitor, the proportional parameter of the inner current controller and the maximum instantaneous power of the DC-AC converter. The paper is summarized as follows. Firstly, the equivalent model of the AC-DC hybrid microgrids in DQ rotating frame is established. Then based on mixed potential theory, the mixed potential model is constructed, and large signal stability criterion is derived and optimized considering the reference current limitation of the DC-AC converter. Finally, the presented criterion is verified by simulation and experimental results.

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“…Furthermore, several research studies have used the linearization method such as eigenvalue [14], [15] or impedance-based [16] approach to evaluate the stability problem under small-signal disturbances. Since the large disturbance is inevitable on the MTDC system, therefore, only the small-signal stability is not enough for analyzing the stability of a large MTDC system [17]. Thereby, non-linear methods of mixed potential theory [17] and Lyapunov based techniques [8] are used for large disturbance stability analysis in the MTDC grid.…”

Section: Introductionmentioning

confidence: 99%

“…Since the large disturbance is inevitable on the MTDC system, therefore, only the small-signal stability is not enough for analyzing the stability of a large MTDC system [17]. Thereby, non-linear methods of mixed potential theory [17] and Lyapunov based techniques [8] are used for large disturbance stability analysis in the MTDC grid. However, all these nonlinear approaches are challenging to implement due to their operational complexity and limited applicability in a large AC/MTDC system.…”

Section: Introductionmentioning

confidence: 99%

Impact of Meshed HVDC Grid Operation and Control on the Dynamics of AC/DC Systems

Hassan

Hossain

Shah

2021

IEEE Systems Journal

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The efficacy of long-distance and bulk power transmission largely depends on the efficient control and reliable operation of a multi-terminal high voltage direct current (MT-HVDC) grid, more precisely, a meshed HVDC grid. The capability of enduring the DC grid fault eventually enhances the reliability and improves the dynamic performance of the grid. This paper investigates the operation and control of an AC/MTDC system with bipolar topology incorporating the DC grid protection schemes. Based on the scale of a circuit breaker's operating time, the performance of three different protection strategies is compared and analyzed using DIgSILENT PowerFactory. Simulation results explicitly reveal that the dynamic performance of the MTDC grid significantly deteriorates with the slow functioning of the protection schemes, followed by a DC grid fault. Besides, prolonged recovery time causes a substantial loss of power infeed and affects the AC/DC grid's stability. Finally, to assess the frailty of the MTDC grid, a transient energy stability index (TESI) is proposed considering the voltage variation in the pre-state and post-state fault clearing interval. Relevant case studies are performed on the MTDC grid using an analytical approach and non-linear simulation studies to validate the effectiveness of the proposed index.

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Large-Signal Stability Analysis for VSC-HVDC Systems Based on Mixed Potential Theory

Cited by 24 publications

References 30 publications

Sub-Synchronous Oscillation Characteristics and Analysis of Direct-Drive Wind Farms With VSC-HVDC Systems

Sub-Synchronous Oscillation Characteristics and Analysis of Direct-Drive Wind Farms With VSC-HVDC Systems

Large signal stability criterion of AC–DC hybrid microgrids with constant power loads considering reference current limitation

Impact of Meshed HVDC Grid Operation and Control on the Dynamics of AC/DC Systems

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