Analysis of Subsynchronous Oscillation Propagation Characteristics Caused by Interharmonics in Wind Integrated Power System

Yang, Jing; Wang, Tong; Wang, Zengping

doi:10.1109/pesgm40551.2019.8973891

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…The constant growth and integration of modern power systems along with developments in renewable energy areas have led to an increase in distortions in voltage and current waveforms. These distortions, known as interharmonics, consist of nonmultiple components of the fundamental frequency and result in a degradation of power quality (PQ) in future electrical networks [1,2]. Consequently, there is a need to update the applicable limits [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

Gudiño-Ochoa,

Jalomo-Cuevas,

Molinar-Solís

et al. 2023

Energies

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In modern power systems, interharmonics have emerged as noninteger frequency components that appear in current or voltage signals. Double-stage AC-DC-AC converters have been identified as a primary source of interharmonics. Previous studies have highlighted modulation techniques, filters, passive components, unbalanced conditions and DC link effects as relevant factors. However, the interaction between these factors and the inertial properties of induction motors has not been explored. This study assesses various types of AC drives, including variable frequency drives (VFDs) and soft starters (AC choppers), to investigate their interaction with machine inertial properties in interharmonic generation. The employed technique for time-frequency spectral analysis is the wavelet synchrosqueezed transform combined with a clustering method. This paper demonstrates that the interaction of the inertial properties of low-power induction motors with the variations of the switching frequencies of the VFDs, the filters used in the DC link and a soft start indirectly contribute to harmonic generation and potentially to interharmonics in the electrical grid and the outputs of the inverter.

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Section: Introductionmentioning

confidence: 99%

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

Gudiño-Ochoa,

Jalomo-Cuevas,

Molinar-Solís

et al. 2023

Energies

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“…Therefore, it is widely applied in many large-capacity long-distance transmission systems. However, it has been found in theoretical studies [3] and real-world operations [4] that the wind-thermal bundling via HVDC transmission systems can trigger the SSO caused by machine-network AC-DC coupling. Frequency stability is an important indicator of power system stability.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Model of the HVDC Transmission System for Sub-Synchronous Oscillations

Wang

Chen

2023

Sustainability

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As the installed capacity of the power system is scaled up and the distance of transmission increases constantly, high-voltage direct current (HVDC) transmission technology has been widely applied across the power system. The HVDC system can lead to sub-synchronous oscillations (SSO) in the turbine and new energy generation systems. When the SSO caused by HVDC are studied through small signal analysis, it is usually necessary to establish the detailed state space model and electromagnetic transient model, which shows various disadvantages such as the high complexity of the model, the high order of the state space matrix, the complex calculation of eigenvalues, and the slow pace of simulation. In the present study, a simplified model intended for the HVDC transmission system is proposed, which can be used to simplify the calculation model and accelerate the simulation by omitting the high-frequency component and simultaneously keeping the sub-synchronous frequency component unchanged. The time domain simulation method is used to compare the dynamic response of the proposed simplified simulation model with that of the original detailed model, and the accuracy of the proposed model is demonstrated. The proposed simplified simulation model is applied to explore the SSO of wind-thermal power bundling in the HVDC transmission system. Additionally, the simulation results of SSO are compared by using the simplified model and the detailed model; the results of which demonstrate the effectiveness and rapidity of the simplified simulation model. The simplified model proposed can greatly improve the efficiency of SSO risk assessment. By selecting reasonable types and parameters of new energy units, SSO of the system can be avoided under risky operation mode, and the power grid operation mode can be monitored and adjusted to ensure the safe operation of the system. Finally, it can promote the sustainable development of the power system.

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“…However, it did not consider the situation where different frequency components coexist and the propagation mechanism in complex networks. In the study presented in reference (Yang et al, 2019), a propagation factor was proposed to quantify the amplitude of oscillations propagated from one point to other points through a multi-input multi-output transfer function. However, it cannot identify the critical nodes and branches for the propagation of oscillation power in the network.…”

Section: Introductionmentioning

confidence: 99%

Identification of dominant propagation paths based on sub-synchronous oscillation using branch oscillation energy distribution coefficient

Wei,

Sun,

Chen

et al. 2023

Front. Energy Res.

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The large-scale integration of wind power into the power grid can cause a new type of sub-synchronous power oscillation, different from traditional thermal power generation. The oscillation energy will spread extensively in the grid, causing power oscillation and even grid-cascading events. To address this issue, this article proposes a method for quantitatively analyzing the propagation characteristics of oscillation energy based on branch oscillation energy. Firstly, analyzing the oscillation energy shared by different branches in the network based on transient energy function. Next, a method is proposed to identify the dominant propagation path of sub-synchronous oscillation by defining the oscillation energy of branches under the dominant oscillation mode and the oscillation energy distribution coefficient of each branch. The oscillation partition set formed by the dominant propagation path can be used to locate the high-risk oscillation area of the system. Finally, the effectiveness of the method proposed in this paper for studying the wide-area propagation characteristics of sub-synchronous oscillations was verified through time-domain simulation analysis.

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Analysis of Subsynchronous Oscillation Propagation Characteristics Caused by Interharmonics in Wind Integrated Power System

Cited by 6 publications

References 11 publications

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

A Simplified Model of the HVDC Transmission System for Sub-Synchronous Oscillations

Identification of dominant propagation paths based on sub-synchronous oscillation using branch oscillation energy distribution coefficient

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