A Notch Filter-Based Active Damping Control Method for Low-Frequency Oscillation Suppression in Train–Network Interaction Systems

Shuai, Zhikang; Cheng, Huijie; Xu, Jiazhu; Shen, Chao; Hong, Yi; Li, Yong

doi:10.1109/jestpe.2019.2895391

Cited by 18 publications

(8 citation statements)

References 32 publications

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“…Fig. 22 shows a basic scheme to extract the low frequency component and calculate the compensation current for the provision of enhanced damping characteristics in the train-network system [67]. These compensators achieve dynamic compensation by detecting the real-time variations to voltage and current references.…”

Section: ) Installation Of Additional Devicesmentioning

confidence: 99%

Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Zhou

et al. 2021

IEEE Trans. Power Electron.

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The wide adoption of a new type of electric trains results in multiple frequency-scale instability problems, such as low-frequency oscillation (LFO), harmonic resonance and harmonic instability. Among them, LFO has been commonly reported at electric railway depots with multiple-energized electric trains around the whole world, thus attracting widespread research attention. LFOs cause adverse effects on the system stability and protection infrastructure of both the traction network and electric trains. This paper presents a comprehensive review of LFOs that consider both academic theoretical analysis and industrial engineering requirements. A unified mathematical model of the traction network and electric train is derived with a view to revealing the mechanism and factors that induce LFOs when these two systems interact. The study also draws deep insights from results of experimental measurements and industrial mitigation schemes already implemented in Chinese railway systems. A variety of mitigation techniques and recommendations based on theoretical principles and practical constraints are presented.

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Section: ) Installation Of Additional Devicesmentioning

confidence: 99%

Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Zhou

et al. 2021

IEEE Trans. Power Electron.

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“…To be specific, the series connected structure of submodule capacitors, the arm inductor along with its parasitic resistor is liable to suffer from RLC resonance issue, which also occurs in some PWM controlled grid-connected circuits such as current/voltage source rectifier [21]- [25], indirect matrix converter [26] and voltage source motor drives [27] [28], with the LC filter incorporated to alleviate the harmonic distortion at the input side. Hence the associated transient oscillation will be excited in the LC filter by the outer transient disturbances and the grid voltage harmonics.…”

Section: Introductionmentioning

confidence: 99%

“…The other perspective to achieve active damping by modifying the control signal with compensators includes changing the modulation index in one cycle of the resonance frequency [23], voltage and current feedback control [24] and state feedback control by pole placement approach [27], etc. To synthesis the merits in both categories, a combination of the virtual resistor and control signal shaping is proposed in [23] [25][26] to achieve better LC resonance mitigation. To sum up, these proposed techniques target at suppressing the input AC side LC oscillation and alleviating the existed harmonic distortion simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Transient Oscillation Suppression Method of Modular Multilevel DC Transformer

Lyu

Sun

et al. 2020

IEEE Access

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The modular multilevel DC transformer (MMDCT) is more likely to suffer from transient oscillation, which is caused by insufficient damping of the equivalent RLC circuit with smaller arm resistance and submodule capacitance and may threaten the system stability. To tackle this issue, this paper conducts an in-depth analysis of the oscillation generating mechanism and thereby proposes a transient oscillation suppression method by incorporating an oscillation suppression angle (OSA) between the upper and lower arm switching voltages, with which the direction of the circulating current could be adjusted during this overlapped period. However, the open loop control of OSA shows indistinctive improvement of the damping ratio so that a damping compensator for regulating the circulating current is utilized. Furthermore, the compensating gain is optimally designed to achieve the critical damping state based on the small-signal model viewing OSA as an input variable. Besides, the outer capacitor voltage control loop and the power control loop are incorporated to provide the circulating current reference and to track the load power demand, respectively. Extensive simulation results from a realistically designed MMDCT model in PSIM validate the feasibility and effectiveness of the proposed transient oscillation suppression method. INDEX TERMS Modular multilevel DC transformer, damping compensation, oscillation suppression, interarm phase shift angle, controller design.

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“…However, the design of controller's parameters depends on the system structure and parameters, and the control method is relatively complex. The other is to adopt active dampers to compensate the inter-harmonics in the power system by installing the inter-harmonics compensation devices [3]- [5]. The standard indirect fundamental wave filtering PWM method based on instantaneous reactive power theory is used for interharmonics compensation, in which the PWM reference signal is the harmonics and inter-harmonics.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Harmonic Spectrum Relocating for Controlling Specific Inter-Harmonics of Inverters With New Phase-Shifted Rotating PWM

Xie

Zhang

et al. 2020

IEEE Access

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The problems of sub-synchronous oscillation and high-frequency oscillation related to interharmonics need to be solved in intermittent energy generation systems. The paper proposes a new Phase-Shifted Rotating Pulse Width Modulation (PSR-PWM) technique for specific inter-harmonics control, which can eliminate the specific inter-harmonic that may cause related inter-harmonic oscillations in power system. Based on the time-shift and phase-shift characteristic of signals, the initial phase angle of a characteristic harmonic is linearly modulated to realize the frequency control of moving the spectrum to the desired inter-harmonic spectrum. Therefore, the inverter controlled by the proposed PWM technique behaves as a controlled inter-harmonic voltage source, so as to suppress the specific inter-harmonics in the grid. The analysis of typical simulation cases shows that the maximum frequency offset range for any modulated output voltage characteristic harmonic of the inverter is from-50Hz to 50Hz theoretically. The amplitude of the inter-harmonic voltage combined with its phase angle and frequency can be continuously controlled over a wide frequency range simultaneously, and the suppression effect of other parasitic interharmonics is obviously better. Finally, the feasibility and correctness of proposed PSR-PWM techniques are verified by MATLAB simulations and experiments. This paper can be helpful for the study of new energy grid-connected inverters to damp sub-synchronous oscillations and high-frequency oscillation. INDEX TERMS frequency control range, frequency spectrum relocation, inter-harmonic control, interharmonic oscillation, phase-shifted rotating pulse width modulation This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.

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A Notch Filter-Based Active Damping Control Method for Low-Frequency Oscillation Suppression in Train–Network Interaction Systems

Cited by 18 publications

References 32 publications

Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Transient Oscillation Suppression Method of Modular Multilevel DC Transformer

Characteristic Harmonic Spectrum Relocating for Controlling Specific Inter-Harmonics of Inverters With New Phase-Shifted Rotating PWM

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