Grid-connected systems with multiple self-synchronizing voltage source inverters(SSVSIs)(referred to as multi-SSVSI grid-connected systems for simplicity)are exposed to low-frequency oscillations(LFOs)and synchronous ...Grid-connected systems with multiple self-synchronizing voltage source inverters(SSVSIs)(referred to as multi-SSVSI grid-connected systems for simplicity)are exposed to low-frequency oscillations(LFOs)and synchronous frequency resonance(SFR).However,the synergistic suppression of these two oscillation modes has not been achieved to date.Considering the dynamic characteristics of transmission circuits and power coupling characteristics,an improved power-frequency(P/ω)admittance model for multi-SSVSI grid-connected systems is established,reflecting the mechanism of LFOs and SFR,as well as the positive and negative effects of corresponding control parameters.In addition,an oscillation suppression method is proposed to enhance the system damping by adding virtual resistance control and transient virtual power feedback control,simultaneously suppressing LFOs and SFR.Unlike existing methods,the proposed method introduces virtual active power instead of real active power as the power feedback into the control loop,thus suppressing LFOs with a smaller transmission resistance and avoiding severe power coupling.Experimental results verify the effectiveness and superiority of the proposed method.展开更多
The creation of a suitable wide area monitoring system(WAMS) is widely recognized as an essential aspect of delivering a power system that will be secure,efficient and sustainable for the foreseeable future. In Great ...The creation of a suitable wide area monitoring system(WAMS) is widely recognized as an essential aspect of delivering a power system that will be secure,efficient and sustainable for the foreseeable future. In Great Britain(GB), the deployment of the first WAMS to monitor the entire power system in real time was the responsibility of the visualization of real time system dynamics using enhanced monitoring(VISOR) project. The core scope of the VISOR project is to deploy this WAMS and demonstrate how WAMS applications can in the near term provide system operators and planners with clear, actionable information. This paper presents the wider scope of the VISOR project and the GB wide WAMS that has been deployed. Furthermore, the paper describes some of the WAMS applications that have been deployed and provides examples of the measurement device performance issues that have been encountered during the project.展开更多
基金supported by the Hunan Provincial Natural Science Foundation of China(No.2024J13012)Shenzhen Science and Technology Program(No.JCYJ20240813162359011)+1 种基金Young Scientists Fund of Hunan Provincial Natural Science Foundation of China(No.2024J16172)Young Scientists Fund of Changsha Natural Science Foundation of China(No.kq2402091).
文摘Grid-connected systems with multiple self-synchronizing voltage source inverters(SSVSIs)(referred to as multi-SSVSI grid-connected systems for simplicity)are exposed to low-frequency oscillations(LFOs)and synchronous frequency resonance(SFR).However,the synergistic suppression of these two oscillation modes has not been achieved to date.Considering the dynamic characteristics of transmission circuits and power coupling characteristics,an improved power-frequency(P/ω)admittance model for multi-SSVSI grid-connected systems is established,reflecting the mechanism of LFOs and SFR,as well as the positive and negative effects of corresponding control parameters.In addition,an oscillation suppression method is proposed to enhance the system damping by adding virtual resistance control and transient virtual power feedback control,simultaneously suppressing LFOs and SFR.Unlike existing methods,the proposed method introduces virtual active power instead of real active power as the power feedback into the control loop,thus suppressing LFOs with a smaller transmission resistance and avoiding severe power coupling.Experimental results verify the effectiveness and superiority of the proposed method.
基金supported by the GB Network Innovation Competition(NIC)
文摘The creation of a suitable wide area monitoring system(WAMS) is widely recognized as an essential aspect of delivering a power system that will be secure,efficient and sustainable for the foreseeable future. In Great Britain(GB), the deployment of the first WAMS to monitor the entire power system in real time was the responsibility of the visualization of real time system dynamics using enhanced monitoring(VISOR) project. The core scope of the VISOR project is to deploy this WAMS and demonstrate how WAMS applications can in the near term provide system operators and planners with clear, actionable information. This paper presents the wider scope of the VISOR project and the GB wide WAMS that has been deployed. Furthermore, the paper describes some of the WAMS applications that have been deployed and provides examples of the measurement device performance issues that have been encountered during the project.
