Impact of Power Flow Direction on the Stability of VSC-HVDC Seen From the Impedance Nyquist Plot

Ամին, Մոհամմադ; Molinas, Marta; Lyu, Jing; Cai, Xu

doi:10.1109/tpel.2016.2608278

Cited by 94 publications

(91 citation statements)

References 37 publications

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“…Traditional methods such as eigenvalue analysis do not give information about such stability. However, Nyquist's stability criterion as a classical frequency domain analysis tool has been applied widely to establish the harmonic stability of grid connected converters [12,15,[37][38][39]. Figure 10 depicts the connected AC side of the converter as previously derived.…”

Section: Harmonic Stability Derivationmentioning

confidence: 99%

Impedance Modelling and Parametric Sensitivity of a VSC-HVDC System: New Insights on Resonances and Interactions

et al. 2018

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Pervasiveness of power converters in the electric power system is expected in the future. Such large penetration will change the current power system dynamics leading to uncertain, unexpected, and potentially critical responses. This paper investigates the stability and resonance of a VSC-HVDC (Voltage Source Converter High Voltage Direct Current) link within an AC grid, whilst providing insights into resonances having a role on the grid. This is studied through the impedance-based modelling of the entire system (AC and DC grids), including controls of converters. Additionally, the impact of the different parameters of the hybrid AC-DC power system such as control systems and grid components on the system dynamics and stability is investigated. From this study, the impact of the system components and the controls of the converter on overall resonance response and stability is shown, including potential undesired sub-synchronous and harmonic resonances due to AC-DC system interactions. The analytical impedance-based models developed and obtained is validated through time-domain simulations, the physical model of the whole system is built in Simscape ™ Power Systems ™ and control systems in MATLAB/Simulink ® (R2017b). This has demonstrated the validity of the model to deal with and detect such dynamics.

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Section: Harmonic Stability Derivationmentioning

confidence: 99%

Impedance Modelling and Parametric Sensitivity of a VSC-HVDC System: New Insights on Resonances and Interactions

et al. 2018

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“…The active power change was simulated to verify the dynamic flow direction change. The VSC was proposed to change the power flow dynamically in the transient status, but the active power of the VSC changes with a delay, even if the power order is switched from the original value to the new order value as a step function [35]. For this reason, the time constant for the power output delay was applied in the model.…”

Section: Model Verificationmentioning

confidence: 99%

An Operation Strategy of the Hybrid Multi-Terminal HVDC for Contingency

et al. 2019

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The application of the direct current (DC) transmission is increasing through the interconnection between grids or the renewable energy resource integration. Various types of DC transmission topology are researched, and the hybrid multi-terminal high voltage DC (HVDC), called the "MTDC", is one of the research subjects. The hybrid multi-terminal HVDC is the MTDC system that is composed with the Line Commutated Converter (LCC) and Voltage Source Converter (VSC). Most hybrid MTDC research has been focused on the connection of the renewable energy generation sources, especially offshore wind farms. However, the DC grid built with a hybrid MTDC was recently proposed due to the development of the converter technology. Therefore, the DC grid is expected to be able to substitute some parts of the transmission grid instead of the alternating current (AC) system, and the operation strategies of the DC grid are still being researched. The DC grid has the advantage of being able to control the power flow, which can even improve the stability of the connected AC system. The dynamic model is required to analyze the improvement of the AC system by the operation strategy of the hybrid MTDC, however, there is no generic model for the system. In this paper, an operation strategy of the hybrid MTDC is proposed to improve the stability of the AC power system by increasing the utilization of parallel AC transmission lines under the contingency condition. Furthermore, studies on the modeling method for a hybrid MTDC analysis were performed. The proposed modeling method and operation strategy were verified in simulations for which a modified IEEE 39 bus test system was used. The improvement of transient stability by the proposed hybrid MTDC system was shown in the simulation results.Studies on the feasibility of the DC grid with various topologies, grid controls, and protection schemes are being conducted [5]. In addition, much research is performed on grid management and the voltage droop control strategy [6][7][8].The control and operation technology of the multi-terminal high voltage DC (HVDC), known as the "MTDC", is fundamental for building and operating the DC grid. The MTDC is used for the HVDC systems consisting of three or more converters and can control the power flow between the converter stations. At the beginning of the MTDC study, the system configuration and normal operation point is introduced in [9] and operation characteristic of MTDC is studied in [10]. Although the Line Commutate Converter (LCC) type was mainly studied in the early research, Voltage Source Converter (VSC)-type MTDC has been mainly researched recently, due to the development of VSC technology. Various research studies on the VSC MTDC, such as the AC and DC system power flow calculations with the VSC MTDC [11,12], the transmission loss minimization [13], and the frequency control [14], have been performed. The recent subjects of research on the hybrid MTDC are mainly control for the system, such as droop control, fault ride through, and voltage-depen...

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“…impedance model can be verified by implementing the disturbance signal test method in the electromagnetic transient simulation (ETS) software [21]. The implementation steps of the disturbance signal test method are shown in Fig.…”

Section: Impedance Model Verification the Theoreticalmentioning

confidence: 99%

“…The influence of the DC capacitors on the system stability is studied in this section, and the improvement of the system stability through the virtual impedance will been introduced in the next section. The Nyquist stability criterion has been used in many applications, ranging from the subsynchronous and harmonic stability problems of grid-tied inverter [10,22] to interconnected DC-DC systems [21,25,26]. It is worth pointing out that this paper attributes the DC voltage fluctuation caused by the inappropriate parameters of the DC capacitor to the scope of stability analysis.…”

Section: Influence Of the DC Capacitorsmentioning

confidence: 99%

Analysis and suppression of DC oscillation caused by DC capacitors in VSC‐based offshore island power supply system

Zhu

Liu

Qin

et al. 2018

IEEJ Transactions Elec Engng

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Voltage source converter-high-voltage direct current (VSC-HVDC) is an effective way to ensure the reliable supply of offshore island power. However, it is easily liable to direct current (DC) oscillation or even instability due to the interaction between the rectifier and inverter stations. In order to solve this problem, this paper analyzes the stability of the VSC-HVDC system caused by DC capacitors based on VSC impedance modeling and impedance stability criterion. Besides, an adaptive virtual impedance control strategy to suppress the DC oscillation is proposed. The impedance models of the VSC in the rectifier and inverter stations are constructed and verified. Then, the influence of the DC capacitors on the system stability is analyzed based on impedance stability criteria. The analysis shows that the decrease of DC capacitors will cause DC oscillation, and the DC virtual impedance is used to damping the oscillation. Finally, this paper presents a simple but effective adaptive fuzzy segmented virtual impedance control strategy to suppress the oscillation. Electromagnetic transient simulation and hardware-in-the-loop (HIL) test results show that the proposed adaptive virtual impedance is more effective and has better robustness than the conventional virtual impedance.

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Impact of Power Flow Direction on the Stability of VSC-HVDC Seen From the Impedance Nyquist Plot

Cited by 94 publications

References 37 publications

Impedance Modelling and Parametric Sensitivity of a VSC-HVDC System: New Insights on Resonances and Interactions

Impedance Modelling and Parametric Sensitivity of a VSC-HVDC System: New Insights on Resonances and Interactions

An Operation Strategy of the Hybrid Multi-Terminal HVDC for Contingency

Analysis and suppression of DC oscillation caused by DC capacitors in VSC‐based offshore island power supply system

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