Research on the New Topology and Coordinated Control Strategy of Renewable Power Generation Connected MMC-Based DC Power Grid Integration System

Wang, Shanshan; Qin, Shanmeng; Yang, Panbo; Sun, Yuanyuan; Zhao, Bing; Yin, Rui; Sun, Shengya; Tian, Chunyi; Zhao, Yuetong

doi:10.3390/sym13101965

Cited by 6 publications

(4 citation statements)

References 8 publications

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“…Equations ( 6) and ( 7) present the relationships among the arm voltage, arm current, dc-side voltage, ac-side current, and ac-side voltage in MMCs. We can define the differential voltage u diff,a (t) and the common-mode voltage u com,a (t) as shown in (8).…”

Section: Equivalent Circuit Model For Mmcs In Transformer-less Applic...mentioning

confidence: 99%

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A Highly Accurate Mathematical Model for Analyzing Modular Multilevel Converters in Transformer-Less Applications

Liu

Wang

2022

Symmetry

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Transformer-less connection schemes can provide a feasible solution for lowering the economic cost, occupied space, and device weight of modular multilevel converter (MMC) systems. However, due to the reduction in the converter transformer, the current flow loop is changed; as a result, the existing MMC model is not suitable. In this paper, the ac- and dc-side equivalent circuit models of the MMC system using a transformer-less connection scheme are established in both a–b–c stationary and d–q rotating coordinate systems. Then, a highly accurate mathematical analysis model is proposed, in which the interactions among the electrical quantities can be fully seen. The mathematical model is established in the time domain, and hence the amplitude and phase angle of every harmonic component in each quantity can be directly obtained. The proposed model is verified under various typical situations by comparing the calculated values with the actual waveforms. The comparison results prove that the calculation error is small enough to be negligible. The mathematical model in this paper can provide a powerful tool in terms of the performance analysis and the main circuit parameter design for MMCs in transformer-less applications.

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Section: Equivalent Circuit Model For Mmcs In Transformer-less Applic...mentioning

confidence: 99%

“…Due to these advantages, the MMC has become the most widely used topology in VSC-based high-voltage direct current (VSC-HVDC) systems [7]. Moreover, it is considered a promising technology for renewable energy integration [8][9][10], medium-voltage reactive power compensation [11,12], electric transportation [13][14][15], and so on.…”

Section: Introductionmentioning

confidence: 99%

A Highly Accurate Mathematical Model for Analyzing Modular Multilevel Converters in Transformer-Less Applications

Liu

Wang

2022

Symmetry

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“…With the continuous progress and maturity of new energy power generation technology, the permeability of renewable energy in the power grid is gradually increasing, which leads to the asymmetry between traditional animation and new energy in the energy structure of the power grid [1,2]. In recent years, abnormal global climate change has led to frequent extreme disasters [3], which have affected the power grid in varying degrees under the background of energy transformation [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

TOPSIS-Based Algorithm for Resilience Indices Construction and the Evaluation of an Electrical Power Transmission Network

Gu¹,

Liu

2022

Symmetry

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In the context of energy transformation, new energy technologies are developing rapidly, the penetration rate of new energy is increasing, and the energy structure tends to be low-carbon, which leads to the asymmetry between traditional energy and new energy. At present, the smart power grid can be conceived as a complex cyber-physical system, and its resilience assessment in the face of extreme disasters needs more holistic consideration. Therefore, considering the impact of massive access to new energy on the resilience of the power grid main network, the resilience evaluation index system of the power grid main network under the background of the energy transition is established. It is proposed to use the priority comparison method and CRITIC (Criteria Importance Through Intercriteria Correlation) to determine the subjective weight and subjective and objective weight of the index, respectively, and combine the influence of the two weights to obtain the comprehensive weight. Then, TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) is used to evaluate the regional power grid restoring force. The results of an example show that the proposed method can effectively evaluate the resilience level of the power grid under the background of the energy transition, which has a certain guiding significance for improving the power grid’s resilience under the environment of energy transformation.

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“…With the structure and operation of the converter being better understood, its fitness to lower voltage and lower power applications can be re-evaluated. Such applications include converters for medium voltage dc (MVDC) systems for renewable and grid-connected applications [90], medium voltage motor drives, as well as transportation electrification (e.g., railway traction power supplies [14], battery chargers [91], marine vessels [92], etc.). The review and comparison we have presented in this article focuses on HVDC application to set the key requirements for the operation of the converter and SM specifications.…”

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confidence: 99%

Review, Classification and Loss Comparison of Modular Multilevel Converter Submodules for HVDC Applications

Tian

Wickramasinghe

et al. 2022

Energies

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The circuit topology of a submodule (SM) in an modular multilevel converter (MMC) defines many of the functionalities of the complete power electronics conversion system and the specific applications that a specific MMC configuration can support. Most prominent among all applications for the MMC is its use in high-voltage direct current (HVDC) transmission systems and multiterminal dc grids. The aim of the paper is to provide a comprehensive review and classification of the many different SM circuit topologies that have been proposed for the MMC up to date. Using an 800-MVA, point-to-point MMC-based HVDC transmission system as a benchmark, the presented analysis identifies the limitations and drawbacks of certain SM configurations that limit their broader adoption as MMC SMs. A hybrid model of an MMC arm and appropriate implementations of voltage-balancing algorithms are used for detailed loss comparison of all SMs and to quantify differences among multiple SMs. The review also provides a comprehensive benchmark among all SM configurations, broad recommendations for the benefits and limitations of different SM topologies which can be further expanded based on the requirements of a specific application, and identifies future opportunities.

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Research on the New Topology and Coordinated Control Strategy of Renewable Power Generation Connected MMC-Based DC Power Grid Integration System

Cited by 6 publications

References 8 publications

A Highly Accurate Mathematical Model for Analyzing Modular Multilevel Converters in Transformer-Less Applications

A Highly Accurate Mathematical Model for Analyzing Modular Multilevel Converters in Transformer-Less Applications

TOPSIS-Based Algorithm for Resilience Indices Construction and the Evaluation of an Electrical Power Transmission Network

Review, Classification and Loss Comparison of Modular Multilevel Converter Submodules for HVDC Applications

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