Stability Analysis and Location Optimization Method for Multiconverter Power Systems Based on Nodal Admittance Matrix

Yang, Li; Shuai, Zhikang; Liu, Xuan; Chen, Yandong; Li, Zuyi; Hong, Yi; Shen, Z. John

doi:10.1109/jestpe.2019.2954560

Cited by 34 publications

(19 citation statements)

References 23 publications

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“…The stability of CCL can be analyzed by the transfer function matrix G opi and the GNC [25], [26]. It was acknowledged that time delay in a digital system and parameters of a current PI controller have impacts on the stability of CCL [12].…”

Section: A Stability Analysis Of Inner Current Control Loop (Ccl)mentioning

confidence: 99%

Stability Investigation of Bidirectional AC-DC Converter Considering Operating Conditions

Shuai

Liu

et al. 2020

IEEE Access

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This paper investigates the stability performances of bidirectional ac-dc converters considering operating conditions based on the small-signal impedance model. It finds that the converter has different stability margins when working in different operating conditions (including inverter mode and rectifier mode, as well as generating/absorbing reactive power), which should be taken into account in the design of the converter for bidirectional energy conversions. To have an intuitive understanding of the instability mechanisms of bidirectional converters in different operating conditions, the concept of positive feedback is used. It finds that with phase-lock loop (PLL) and dc-link voltage control loop (VCL), positive feedback effects appear when the converter operating in different conditions; and the influencing mechanisms of the parameters, including control parameters of PLL, inner current and outer voltage controllers and power ratings, on the converter's stability can be explicitly identified by the positive feedback gains. And it indicates that reducing the values of the parameters along the positive feedback paths will be a practical way to enhance the converter's stability. The theoretical stability analysis results are verified by simulations and experiments.

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Section: A Stability Analysis Of Inner Current Control Loop (Ccl)mentioning

confidence: 99%

Stability Investigation of Bidirectional AC-DC Converter Considering Operating Conditions

Shuai

Liu

et al. 2020

IEEE Access

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“…The admittance matrix approach is used in these studies as it provides a simple and accurate way to characterize large-scale power system behavior in frequency domain. Recently, a worthy AC-side stability study of multiterminal VSC power systems based on the nodal admittance matrix approach and the AC-side 2x2 input admittance-based matrix of VSCs has been presented in [26].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the VSC AC-and DC-side impedance models are derived from the three-port matrix model. The paper also extends the Norton admittance method used for AC-side stability analysis of multi-terminal VSC power systems in [26] to study AC-and DC-side stability of multi-terminal HVDC hybrid AC/DC transmission grids, where the proposed threeport admittance matrix model is easily included in the nodal admittance matrix of large-scale hybrid AC/DC grids handling VSCs as independent components. This methodology allows the assessment of multi-terminal HVDC hybrid AC/DC transmission grid stability using impedance-based stability criteria (e.g., Generalized Nyquist Criterion, GNC).…”

Section: Introductionmentioning

confidence: 99%

Three-Port Small Signal Admittance-Based Model of VSCs for Studies of Multi-Terminal HVDC Hybrid AC/DC Transmission Grids

Pedra

Sainz

Monjo

2021

IEEE Trans. Power Syst.

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Multi-terminal high voltage direct current (HVDC) systems, together with AC transmission systems and voltage source converters (VSCs), form hybrid AC/DC grids with complex dynamic and transient interactions. VSCs characterization taking into account DC-and AC-side dynamics in order to study these interactions is not yet well solved. This paper presents a three-port transfer admittance-based matrix model of VSCs that can be applied for such purpose. It is derived from dq-complex space vectors and characterizes both AC-and DC-side dynamics by relating AC-and DC-side current and voltages in a three-dimensional admittance transfer matrix which considers the VSC outer control loops. The paper also proposes a systematical procedure for studying multi-terminal HVDC hybrid AC/DC transmission grids by the Norton admittance method, where the proposed VSC model can be easily included in the Norton admittance matrix. This procedure allows the study of grid dynamics using impedance-based stability criteria. The proposed model and procedure are applied to a stability study in a multi-terminal HVDC hybrid AC/DC transmission grid. PSCAD/EMTDC simulations are used to validate the application.

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“…Similar to the LIM method, the RHP poles calculation can also be avoided in the NAM method. In addition, a frequency-domain component connection method is presented in [16], [33]- [35], where the generalized NC is applied on the return ratio of the impedance matrices of the connection network and the composite model of all inverters. Since the two impedance matrices can commonly be guaranteed to not have RHP poles, the RHP poles calculation in the generalized NC can be avoided.…”

Section: Introductionmentioning

confidence: 99%

“…Since the two impedance matrices can commonly be guaranteed to not have RHP poles, the RHP poles calculation in the generalized NC can be avoided. According to the discussions in [16], [35], the derived NAMs in [30]- [32] are exactly the closed-loop transfer function matrices of multiple-input-multiple-output negative feedback systems with feed-forward gain being 1 and feed-back gain being the return-ratio matrices derived in [16], [33]- [35]. Since admittance information of each GCI is stored in the derived NAM and return-ratio matrix, global stability feature can be obtained, and oscillation origin can further be located based on participation factor analysis [35].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Oscillation Origin Location in Multiple-Inverter-Based Power Systems Using Components Impedance Frequency Responses

Zhou

Torres-Olguin

Zadeh

et al. 2021

IEEE Open J. Ind. Electron. Soc.

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Stability Analysis and Location Optimization Method for Multiconverter Power Systems Based on Nodal Admittance Matrix

Cited by 34 publications

References 23 publications

Stability Investigation of Bidirectional AC-DC Converter Considering Operating Conditions

Stability Investigation of Bidirectional AC-DC Converter Considering Operating Conditions

Three-Port Small Signal Admittance-Based Model of VSCs for Studies of Multi-Terminal HVDC Hybrid AC/DC Transmission Grids

Electromagnetic Oscillation Origin Location in Multiple-Inverter-Based Power Systems Using Components Impedance Frequency Responses

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