The traditional power system dominated by synchronous generators is gradually evolving into a power system with high penetration of inverter-based resources(IBRs).In this paper,the new characteristics that arise from ...The traditional power system dominated by synchronous generators is gradually evolving into a power system with high penetration of inverter-based resources(IBRs).In this paper,the new characteristics that arise from the high penetration of IBRs in power systems are reviewed.In light of these characteristics,current simulation technologies are inadequate and new requirements for the simulation platforms have been proposed.In response,this paper introduces the rapid system prototype(RSP)-based physical simu-lation platforms,which include the digital simulator,the rapid prototype controller,and the rapid object-controlled prototype.RSP addresses the time-consuming and labour-intensive shortcomings of traditional simulation techniques and meets the rapid evolu-tion needs of the power system with high penetration of IBRs.Compared with existing simulation platforms,RSP is a more suitable platform for the physical simulation of power systems with high penetration of IBRs.Using the modular multilevel converter-based high-voltage direct current as a case study,a novel physical simulation platform for power systems based on RSP is constructed.Experimental results demonstrate that the RSP concept and technology can establish an enterprise-level simulation environment and engineering practice platform.Moreover,it can provide realistic and flexible simu-lations of various characteristics of power systems with high penetration of IBRs.展开更多
This paper systematically investigates the multidegree-of-freedom(multi-DoF)control framework of high voltage direct current(HVDC)converters based on their topological characteristics and control requirements.First,th...This paper systematically investigates the multidegree-of-freedom(multi-DoF)control framework of high voltage direct current(HVDC)converters based on their topological characteristics and control requirements.First,this study reveals that its topology determines the control degrees of freedom(CDoF)of a converter.Specifically,a line-commutated converter(LCC)possesses only one CDoF,a voltage source converter(VSC)has two,and a modular multilevel converter(MMC)can theoretically achieve up to eight.However,only six CDoF are practically necessary for MMC.Despite this,existing MMC control strategies utilize only four CDoF,limiting control flexibility.To overcome this issue,this paper proposes a six-degree-offreedom(6 DoF)control framework for MMC,which enables asymmetric and precise regulation of DC voltage and SM capacitor voltage compared to the existing MMC control.Based on this framework,corresponding control strategies are designed for MMCs in HVDC systems with different control objectives.Finally,a two-terminal MMC-HVDC system is built on the PSCAD/EMTDC to verify the effectiveness of the proposed 6 DoF control.展开更多
基金National Natural Science Foundation of China,Grant/Award Numbers:U22B20111,52237004,523B2074。
文摘The traditional power system dominated by synchronous generators is gradually evolving into a power system with high penetration of inverter-based resources(IBRs).In this paper,the new characteristics that arise from the high penetration of IBRs in power systems are reviewed.In light of these characteristics,current simulation technologies are inadequate and new requirements for the simulation platforms have been proposed.In response,this paper introduces the rapid system prototype(RSP)-based physical simu-lation platforms,which include the digital simulator,the rapid prototype controller,and the rapid object-controlled prototype.RSP addresses the time-consuming and labour-intensive shortcomings of traditional simulation techniques and meets the rapid evolu-tion needs of the power system with high penetration of IBRs.Compared with existing simulation platforms,RSP is a more suitable platform for the physical simulation of power systems with high penetration of IBRs.Using the modular multilevel converter-based high-voltage direct current as a case study,a novel physical simulation platform for power systems based on RSP is constructed.Experimental results demonstrate that the RSP concept and technology can establish an enterprise-level simulation environment and engineering practice platform.Moreover,it can provide realistic and flexible simu-lations of various characteristics of power systems with high penetration of IBRs.
基金supported in part by National Key R&D Program of China(2022YFB2405400)in part by National Natural Science Foundation of China(52237004).
文摘This paper systematically investigates the multidegree-of-freedom(multi-DoF)control framework of high voltage direct current(HVDC)converters based on their topological characteristics and control requirements.First,this study reveals that its topology determines the control degrees of freedom(CDoF)of a converter.Specifically,a line-commutated converter(LCC)possesses only one CDoF,a voltage source converter(VSC)has two,and a modular multilevel converter(MMC)can theoretically achieve up to eight.However,only six CDoF are practically necessary for MMC.Despite this,existing MMC control strategies utilize only four CDoF,limiting control flexibility.To overcome this issue,this paper proposes a six-degree-offreedom(6 DoF)control framework for MMC,which enables asymmetric and precise regulation of DC voltage and SM capacitor voltage compared to the existing MMC control.Based on this framework,corresponding control strategies are designed for MMCs in HVDC systems with different control objectives.Finally,a two-terminal MMC-HVDC system is built on the PSCAD/EMTDC to verify the effectiveness of the proposed 6 DoF control.
