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A bi-layer coordinated power regulation strategy considering system dynamics and economics for isolated hybrid AC/DC multi-energy microgrid 认领 引用 被引量：1
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作者 Jing ZHANG Yong LI +7 位作者 Jinjie LIN Sijia HU Yijia CAO Li HE Xusheng YANG Yong XU Lin ZENG Linjin XIE 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2025年第1期374-390,共17页
The isolated hybrid AC/DC multi-energy microgrid(IH-MEMG)offers an effective solution for meeting the electrical,heating,and cooling energy demands of remote and off-grid areas.For an IH-MEMG,system transient dynamics... The isolated hybrid AC/DC multi-energy microgrid(IH-MEMG)offers an effective solution for meeting the electrical,heating,and cooling energy demands of remote and off-grid areas.For an IH-MEMG,system transient dynamics(i.e.,frequency or voltage of the electricity network)and economics are critical aspects that pose the greatest concern to operators.However,these aspects are generally investigated separately owing to their different time scales.To integrate these aspects from the scope of real-time control,this study proposes a bi-layer coordinated power regulation strategy considering system dynamics and economics for the IH-MEMG.First,coupling relationships among multiple sub-networks are analyzed,and a frequency-voltage coupling model between the AC and DC sides is established.Then,a bi-layer coordinated power regulation strategy is developed for the IH-MEMG with output characteristics of different components involved:the primary layer includes a multi-entity power support mechanism used to improve the dynamics of the electricity network,wherein a cooperation principle of the combined cooling,heating,and power(CCHP)unit and energy storage unit(ESU)is designed in detailed;meanwhile,the secondary layer includes a real-time economics-oriented optimization framework used to adjust the power references of multiple units generated from the primary layer for cost efficiency improvement(notably,the primary layer can work independently).Finally,the effectiveness of the proposed strategy is verified through comprehensive simulations under varying operation scenarios. 展开更多
关键词 isolated hybrid AC/DC multi-energy microgrid bi-layer coordinated power regulation dynamics and economics combined cooling heating and power unit energy storage unit
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Novel Discrete-time Frequency-locked Loop for Three-phase Grid-connected Power Converters 认领 引用
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作者 Jiaqi Yu Wenming Guo +3 位作者 Feng Zhou Linjin Xie Mingmin Zhang Lihua Cao 《Chinese Journal of Electrical Engineering》 EI CSCD 2025年第1期174-183,共10页
Anovel discrete-time frequency-locked loop(FLL)for three-phase grid-connected power converters that features rapid dynamic response and low computational costis introduced.Firstly,asimplified nonlinear frequency-estim... Anovel discrete-time frequency-locked loop(FLL)for three-phase grid-connected power converters that features rapid dynamic response and low computational costis introduced.Firstly,asimplified nonlinear frequency-estimation model that leverages the inherent orthogonality of voltage signals in theαβ-frame,along with an optimal fixed-length delay,is proposed.Subsequently,a discrete-time FLL structure is developed based on this model.In addition,a convergence analysis and parameter designarepresented.Finally,acomparative experiment with established methods isconducted,and the results demonstratethat the proposed FLL offers a faster dynamic response,requires fewer parameters to be tuned,ensures a smoother startup process,and maintains a relativelylower computationalcost. 展开更多
关键词 Grid-connected power converters frequency-locked loop nonlinear frequency estimation harmonics rejection
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